From 4e0def667c29ab5d9b9a6897cd509704d9ef58c8 Mon Sep 17 00:00:00 2001
From: Jenkins nedprod CI <foo@nowhere>
Date: Thu, 17 Oct 2024 20:15:02 +0000
Subject: [PATCH] CI regenerates Boost.Outcome docs

---
 doc/html/_footer.html                         |   21 +
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 doc/html/abi-stability.html                   |   95 +
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 doc/html/alternatives/leaf.html               |   84 +
 doc/html/alternatives/outcome.html            |   94 +
 doc/html/build.html                           |  220 ++
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 doc/html/changelog.html                       |  883 +++++++
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 doc/html/css/boost.css                        | 1126 ++++++++
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 doc/html/experimental/worked-example.html     |   85 +
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 doc/html/faq.html                             |  674 +++++
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 doc/html/history.html                         |  213 ++
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 doc/html/index.html                           |  242 ++
 doc/html/motivation.html                      |   57 +
 doc/html/motivation/errno.html                |   70 +
 doc/html/motivation/error_codes.html          |   63 +
 doc/html/motivation/exceptions.html           |   79 +
 doc/html/motivation/narrow_contract.html      |  131 +
 doc/html/motivation/plug_error_code.html      |  187 ++
 doc/html/motivation/plug_error_code2.html     |  190 ++
 doc/html/motivation/std_error_code.html       |   70 +
 doc/html/recipes.html                         |   36 +
 doc/html/recipes/asio-integration-1-70.html   |  294 +++
 doc/html/recipes/asio-integration.html        |  279 ++
 doc/html/recipes/foreign-try.html             |  178 ++
 doc/html/reference.html                       |  208 ++
 doc/html/reference/aliases.html               |   56 +
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 doc/html/reference/aliases/boost_result.html  |   33 +
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+  <div class="titlepage"><div><div><h1 style="clear: both"></h1></div></div></div>
+  <p>Outcome 2.2 library documentation</p>
+
+
+        </div><p><small>Last revised: January 01, 0001 at 00:00:00 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./history.html"><img src="./images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/abi-stability.html b/doc/html/abi-stability.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Future ABI stability guarantees - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="./motivation/narrow_contract.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">Future ABI stability guarantees</h1></div></div></div>
+
+
+<p>At the end of December 2021, <a href="./history.html">as had been intended and signposted from the beginning of development</a>, standalone Outcome v2.2.3 locked its ABI such that any code built with this Outcome release shall link, without recompilation, with any code built with any future Outcome release. This means that going forth, you are guaranteed that if your library returns an <code>outcome::</code><a href="./reference/aliases/result.html" class="api-reference"><code>result&lt;T, E = varies, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+ or <code>outcome::</code><a href="./reference/aliases/outcome.html" class="api-reference"><code>outcome&lt;T, EC = varies, EP = varies, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+ from a public API, consumers of your library are guaranteed 100% compatibility with unrecompiled library binaries when using any future version of Outcome in consuming code.</p>
+
+<p>This is a critical use case for many large scale production use cases in industry, and to my knowledge, no other Outcome-like alternative implements this guarantee at the time of writing<sup class="footnote-ref" id="fnref:1"><a href="#fn:1">1</a></sup>. Note also that Boost.Outcome comes with no ABI guarantees, as the dependencies within Boost that Boost.Outcome uses do not have a stable ABI guarantee.</p>
+
+<p>To ensure this guarantee going forth, a per commit CI step has been added which tests Outcome against the v2.2.3 ABI using these tools:</p>
+
+<ul>
+<li><a href="https://lvc.github.io/abi-compliance-checker/">The ABI compliance checker</a> (using its <code>abi-dumper</code> mode, not its translation unit parsing mode which is too brittle).</li>
+<li><a href="https://sourceware.org/libabigail/manual/libabigail-tools.html">Sourceware&rsquo;s libabigail tooling</a>.</li>
+</ul>
+
+<p>Both tools are independent of one another, and whilst they test using the same mechanism (DWARF debug info extracted from an unoptimised shared library object), they have different implementations.</p>
+
+<h4 id="abi-testing-implementation-notes">ABI testing implementation notes</h4>
+
+<p>Outcome is a header only library, so to turn Outcome into a shared library suitable as input for these tools, we compile a dummy shared library which exports APIs which use Outcome. The coverage of that dummy shared library of Outcome is therefore what is actually ABI tested, rather than of Outcome itself. The dummy library locks the ABI for:</p>
+
+<ul>
+<li><code>basic_result&lt;trivial type, std::error_code, all policies&gt;</code> (i.e. union storage layout)</li>
+<li><code>basic_outcome&lt;trivial type, std::error_code, trivial type, all policies&gt;</code></li>
+<li><code>basic_result&lt;non-trivial type, std::error_code, all policies&gt;</code> (i.e. struct storage layout)</li>
+<li><code>basic_outcome&lt;non-trivial type, std::error_code, std::exception_ptr, all policies&gt;</code></li>
+<li><code>bad_result_access_with&lt;std::error_code&gt;</code></li>
+<li><code>bad_outcome_access</code></li>
+<li><code>atomic_eager&lt;int&gt;</code></li>
+<li><code>atomic_eager&lt;basic_result&lt;trivial type, std::error_code, all policies&gt;&gt;</code></li>
+<li><code>atomic_eager&lt;basic_result&lt;non-trivial type, std::error_code, all policies&gt;&gt;</code></li>
+<li><code>atomic_lazy&lt;int&gt;</code></li>
+<li><code>atomic_lazy&lt;basic_result&lt;trivial type, std::error_code, all policies&gt;&gt;</code></li>
+<li><code>atomic_lazy&lt;basic_result&lt;non-trivial type, std::error_code, all policies&gt;&gt;</code></li>
+<li><code>eager&lt;int&gt;</code></li>
+<li><code>eager&lt;basic_result&lt;trivial type, std::error_code, all policies&gt;&gt;</code></li>
+<li><code>eager&lt;basic_result&lt;non-trivial type, std::error_code, all policies&gt;&gt;</code></li>
+<li><code>lazy&lt;int&gt;</code></li>
+<li><code>lazy&lt;basic_result&lt;trivial type, std::error_code, all policies&gt;&gt;</code></li>
+<li><code>lazy&lt;basic_result&lt;non-trivial type, std::error_code, all policies&gt;&gt;</code></li>
+</ul>
+
+<p>Obviously anything which any of these types touch in their implementation also gets locked in ABI, in so far as the ABI tool can deduce dependent types. If you examine the source code for the dummy shared library, you will see that we go out of our way to encode explicit lists of dependent types in template parameters, to ensure that the ABI tool definitely discovers everything.</p>
+
+<div class="notices note" style="background: url('images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>Outcome.Experimental has no ABI guarantees, as WG21 LEWG is actively modifying its design as it approaches the C++ standard.</p>
+</div>
+</div>
+
+
+<p>The following targets are tested for ABI stability:</p>
+
+<ol>
+<li><p>GCC 7.5 with libstdc++ configured with the C++ 14 standard and x64 architecture.</p></li>
+
+<li><p>GCC 9.3 with libstdc++ configured with the C++ 17 standard and x64 architecture.</p></li>
+</ol>
+
+<p>At the time of writing, no POSIX implementation has guaranteed stability on its C++ 20 standard library ABI, so we do not test that.</p>
+
+<p>There is currently no CI coverage of MSVC ABI stability. The ABI compliance checker can test MSVC binaries for ABI stability, however raising the ABI compliance checker on a Github Actions Windows test runner is quite a lot of work. Donations of sufficient test scripting would be welcome. Note that because the Windows and POSIX implementation is almost the same, ABI stability on POSIX will have strong impact on MSVC ABI stability i.e. MSVC ABI is unlikely to break, albeit without CI testing there are no guarantees.</p>
+<div class="footnotes">
+
+<hr />
+
+<ol>
+<li id="fn:1">libstdc++ implements a strong ABI stability guarantee and thus any future <code>std::expected&lt;T, E&gt;</code> implementation it provides will be ABI stable. However Expected offers only a small subset of the functionality which <code>outcome::result&lt;T, E&gt;</code> provides.
+ <a class="footnote-return" href="#fnref:1"><sup>[return]</sup></a></li>
+</ol>
+</div>
+
+
+
+        </div><p><small>Last revised: December 15, 2021 at 11:47:12 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./motivation/narrow_contract.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
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diff --git a/doc/html/alternatives.html b/doc/html/alternatives.html
new file mode 100644
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+++ b/doc/html/alternatives.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Review of Error Handling Frameworks - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="./build.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">Review of Error Handling Frameworks</h1></div></div></div>
+<p>Outcome <a href="./history.html">started life in 2014</a>, entered Boost as Boost.Outcome in 2018, and therefore was amongst the very first of the major alternative error handling frameworks to standard exception throws in C++. Since then, and sometimes in reaction to Outcome&rsquo;s choice of design, alternative frameworks have appeared. This page tries to give a fairly even handed summary of those alternatives, and how they compare to Outcome in this author&rsquo;s opinion.</p>
+
+<p>These are listed in order of approximate availability to the C++ ecosystem i.e. in order of appearance.</p>
+
+<ol class="children children-li"><li>
+	<a href="./alternatives/exceptions.html" >std exception throws</a>
+<p>Advantages and disadvantages of C++ exception throws</p><li>
+	<a href="./alternatives/error_code.html" >std error codes</a>
+<p>Advantages and disadvantages of <code>std::error_code</code></p><li>
+	<a href="./alternatives/expected.html" >std expected</a>
+<p>Advantages and disadvantages of <code>std::expected&lt;T, E&gt;</code></p><li>
+	<a href="./alternatives/outcome.html" >Outcome (proposed std result)</a>
+<p>Advantages and disadvantages of Outcome and its proposed <code>std::result&lt;T&gt;</code></p><li>
+	<a href="./alternatives/leaf.html" >LEAF</a>
+<p>Advantages and disadvantages of Lightweight Error Augmentation Framework</p></li></ol>
+
+<p>My thanks to Emil Dotchevski for reviewing this summary and providing notes.</p>
+
+
+
+
+
+
+
+        </div><p><small>Last revised: January 10, 2022 at 14:29:13 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./build.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/alternatives/error_code.html b/doc/html/alternatives/error_code.html
new file mode 100644
index 000000000..9140489af
--- /dev/null
+++ b/doc/html/alternatives/error_code.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std error codes - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../alternatives/exceptions.html"><img src="../images/prev.png" alt="Prev"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">std error codes</h1></div></div></div>
+  
+
+<p><code>std::error_code</code> came originally from <code>boost::error_code</code> which was designed around 2008 as part of implementing Filesystem and Networking. They are a simple trivially copyable type offering improved type safety and functionality over C enumerations. <a href="../motivation/std_error_code.html">You can read more about how <code>std::error_code</code> works here</a>. They were standardised in the C++ 11 standard, and have been available in Boost since 2008.</p>
+
+<h4 id="pros">Pros:</h4>
+
+<ul>
+<li><p>Predictable runtime overhead on the happy path.</p></li>
+
+<li><p>Predictable runtime overhead on the sad path.</p></li>
+
+<li><p>Unbiased syntax equal for both success and failure requiring explicit code written to handle both.</p></li>
+
+<li><p>Very little codegen bloat added to binaries (though there is a fixed absolute overhead for support libraries).</p></li>
+
+<li><p>Once constructed, passing around <code>std::error_code</code> instances optimises well, often being passed in CPU registers.</p></li>
+
+<li><p>Works well in all configurations of C++, including C++ exceptions and RTTI globally disabled.</p></li>
+
+<li><p>Works well on all niche architectures, such as HPC, GPUs, DSPs and microcontrollers.</p></li>
+
+<li><p>Ships with every standard library since C++ 11.</p></li>
+</ul>
+
+<h4 id="cons">Cons:</h4>
+
+<ul>
+<li><p>Failure to write handling code for failure means failures get silently dropped. This is disturbingly easy to do.</p></li>
+
+<li><p>Results in branchy code, which is slow &ndash; though predictably so &ndash; for embedded controller CPUs.</p></li>
+
+<li><p>Because the <code>std::error_category</code> instance used in construction comes from a magic static, the compiler inserts an atomic operation around every <code>std::error_code</code> construction (e.g. <a href="https://godbolt.org/z/oGaf4qe8a">https://godbolt.org/z/oGaf4qe8a</a>). This can impact optimisation on compilers with poor optimisation of atomics.</p></li>
+
+<li><p>The payload of type <code>int</code> is incredibly constraining sometimes, especially on 64-bit platforms. It would have been much better if it were <code>intptr_t</code> instead of <code>int</code>.</p></li>
+
+<li><p>The payload value of all bits zero has silent hard coded semantics which is incompatible with many C enumerations, which start from value zero. This can cause silent dropping of failures in a very hard to debug way.</p></li>
+
+<li><p>How comparisons between disparate code categories (i.e. mapping) is supposed to work is non-obvious, and even standard library maintainers and many members of WG21 have been confused by it in the past.</p></li>
+</ul>
+
+<p>(Note that this long list of design caveats is what led to the proposed superseding of <code>std::error_code</code> with <code>std::error</code>, which you can use today in Outcome.Experimental. See <a href="../experimental.html">this page for more information</a>).</p>
+
+
+        </div><p><small>Last revised: January 10, 2022 at 14:29:13 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../alternatives/exceptions.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../alternatives.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../alternatives/expected.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/alternatives/exceptions.html b/doc/html/alternatives/exceptions.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/alternatives/exceptions.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std exception throws - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../alternatives.html"><img src="../images/prev.png" alt="Prev"></a>
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../alternatives/error_code.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">std exception throws</h1></div></div></div>
+  
+
+<p>(Note that we assume a table-based EH implementation here, a SJLJ EH implementaton would have even happy and sad path runtime overhead. Table-based EH implementations are almost universal on x64, ARM and AArch64 targets).</p>
+
+<p>C++ exception throws came in the original C++ 98 standard &ndash; at that time, not all the major compilers implemented them yet, and several of those who did did not have efficient implementations, plus in the original days some compiler vendors still patented things like EH implementation techniques to try and maintain a competitive advantage over rival compilers. Unlike other C++ features, enabling C++ exceptions on a code base not written with them in mind is not safe, so this led to the C++ ecosystem becoming bifurcated into exceptions-enabled and exceptions-disabled camps.</p>
+
+<h4 id="pros">Pros:</h4>
+
+<ul>
+<li><p>Zero runtime overhead on the happy path.</p></li>
+
+<li><p>Success-orientated syntax declutters code of failure control flow paths.</p></li>
+
+<li><p>As a built-in language feature, probably has the least impact on optimisation of any failure handling mechanism here.</p></li>
+
+<li><p>Ships with every standard toolchain (though may not work in some, and cannot be safely enabled for many codebases).</p></li>
+</ul>
+
+<h4 id="cons">Cons:</h4>
+
+<ul>
+<li><p>Unpredictable runtime overhead on the sad path.</p></li>
+
+<li><p>Unacceptable runtime overhead on the sad path for real time applications.</p></li>
+
+<li><p>Adds considerable bloat to produced binaries, which can be unacceptable for some use cases (embedded).</p></li>
+
+<li><p>Requires RTTI to be enabled or non-standard behaviour results (which is further binary bloat).</p></li>
+
+<li><p>Not available by tradition or convention in several major parts of the C++ ecosystem (embedded, games, audio, to a lesser extent financial).</p></li>
+
+<li><p>Not available in many niche architectures such as HPC, GPUs, DSPs and microcontrollers.</p></li>
+
+<li><p>Most codebases do not invest in adequate correctness testing of the silent proliferation of failure control flow paths which result in C++ exception throwing code (exception throws silently generate multitudes of slight variations of sad path control flows).</p></li>
+</ul>
+
+
+        </div><p><small>Last revised: January 10, 2022 at 14:29:13 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../alternatives.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../alternatives.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../alternatives/error_code.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/alternatives/expected.html b/doc/html/alternatives/expected.html
new file mode 100644
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+++ b/doc/html/alternatives/expected.html
@@ -0,0 +1,69 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std expected - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../alternatives/error_code.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../alternatives.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../alternatives/outcome.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">std expected</h1></div></div></div>
+  
+
+<p><code>std::expected&lt;T, E&gt;</code> came originally from an experimental monadic and generic programming library outside of Boost written by Boost and WG21 developers around 2013. Before Outcome v1, I deployed the then Expected into a large codebase and I was dismayed with the results, especially on build times. <a href="../history.html">You can read here how those experiences led me to develop Outcome v1</a>.</p>
+
+<p><code>std::expected&lt;T, E&gt;</code> is a constrained variant type with a strong preference for the successful type <code>T</code> which it models like a <code>std::optional&lt;T&gt;</code>. If, however, there is no <code>T</code> value then it supplies an &lsquo;unexpected&rsquo; <code>E</code> value instead. <code>std::expected&lt;T, E&gt;</code> was standardised in the C++ 23 standard.</p>
+
+<p>Outcome&rsquo;s Result type <a href="../faq.html#how-far-away-from-the-proposed-std-expected-t-e-is-outcome-s-checked-t-e">can be configured to act just like Expected if you want that</a>, however ultimately <a href="../faq.html#why-doesn-t-outcome-duplicate-std-expected-t-e-s-design">Outcome&rsquo;s Result doesn&rsquo;t solve the same problem as Expected</a>, plus Outcome models <code>std::variant&lt;T, E&gt;</code> rather than <code>std::optional&lt;T&gt;</code> which we think much superior for many use cases, which to summarise:</p>
+
+<ul>
+<li><p>If you are parsing input which may rarely contain unexpected values, Expected is the right choice here.</p></li>
+
+<li><p>If you want an alternative to C++ exception handling i.e. a generalised whole-program error handling framework, Expected is an inferior choice to alternatives.</p></li>
+</ul>
+
+<p>Outcome recognises Expected-like types and will construct from them, which aids interoperability.</p>
+
+<h4 id="pros">Pros:</h4>
+
+<ul>
+<li><p>Predictable runtime overhead on the happy path.</p></li>
+
+<li><p>Predictable runtime overhead on the sad path.</p></li>
+
+<li><p>Very little codegen bloat added to binaries (though there is a fixed absolute overhead for support libraries).</p></li>
+
+<li><p>Variant storage means storage overhead is minimal, except when either <code>T</code> or <code>E</code> has a throwing move constructor which typically causes storage blowup.</p></li>
+
+<li><p>Works well in all configurations of C++, including C++ exceptions and RTTI globally disabled.</p></li>
+
+<li><p>Works well on all niche architectures, such as HPC, GPUs, DSPs and microcontrollers.</p></li>
+
+<li><p>Ships with every standard library since C++ 23.</p></li>
+</ul>
+
+<h4 id="cons">Cons:</h4>
+
+<ul>
+<li><p>Success-orientated syntax makes doing anything with the <code>E</code> type is awkward and clunky.</p></li>
+
+<li><p>Results in branchy code, which is slow &ndash; though predictably so &ndash; for embedded controller CPUs.</p></li>
+
+<li><p>Failure to examine an Expected generates a compiler diagnostic, but failure to handle both failure and success does not. This can mean failures or successes get accidentally dropped.</p></li>
+
+<li><p>Lack of a <code>try</code> operator makes use tedious and verbose.</p></li>
+
+<li><p>Variant storage does have an outsize impact on build times in the same way widespread use of <code>std::variant</code> has. This is because implementing exception guarantees during copies and moves of non-trivially-copyable types in union storage involves a lot of work for the compiler on every use of copy and move.</p></li>
+</ul>
+
+
+        </div><p><small>Last revised: January 10, 2022 at 14:29:13 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../alternatives/error_code.html"><img src="../images/prev.png" alt="Prev"></a>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>LEAF - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../alternatives/outcome.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../alternatives.html"><img src="../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">LEAF</h1></div></div></div>
+  
+
+<p>As much as Outcome originated in a negative reaction to the then originally proposed <code>std::expected&lt;T, E&gt;</code>, <a href="https://boostorg.github.io/leaf/">LEAF</a> originated in a negative reaction to Outcome. Some of the perceived issues with Outcome were (<a href="https://boostorg.github.io/leaf/#rationale">LEAF&rsquo;s own rendition of this can be viewed here</a>):</p>
+
+<ul>
+<li><p>Outcome based code is visually cluttered, as both happy and sad paths appear in code.</p></li>
+
+<li><p>Outcome based code generates branchy code at runtime, which impacts low end CPUs and first time code execution.</p></li>
+
+<li><p>Outcome&rsquo;s Result type encodes the type of the error in the function signature, which could be considered as more brittle and problematic for large scale code refactoring<sup class="footnote-ref" id="fnref:1"><a href="#fn:1">1</a></sup>.</p></li>
+
+<li><p>Outcome is more strongly opinionated about being the ultimate error handling framework in a program (i.e. all third party custom error handling is assumed to flow into Outcome via customisation point adapters), whereas LEAF is less strongly opinionated, and yet provides equivalent functionality.</p></li>
+</ul>
+
+<p>LEAF therefore looks more like standard C++ exception handling, but without the non-deterministic sad path at the cost of a slight impact on happy path runtime performance. LEAF&rsquo;s current design was completed in 2020.</p>
+
+<p>If you need an error handling framework which has predictable sad path overhead unlike C++ exceptions, but you otherwise want similar syntax and use experience to C++ exceptions, LEAF is a very solid choice.</p>
+
+<h4 id="pros">Pros:</h4>
+
+<ul>
+<li><p>Very low runtime overhead on the happy path.</p></li>
+
+<li><p>Very low runtime overhead on the sad path.</p></li>
+
+<li><p>Does not cause branchy code to the same extent as Outcome, and the sad path is deterministic unlike with C++ exceptions.</p></li>
+
+<li><p>Very little codegen bloat added to binaries (though there is a fixed absolute overhead for support libraries, most of which can be compiled out using a macro if desired).</p></li>
+
+<li><p>Unlike with any of the preceding options, failures nor successes cannot get unintentionally dropped. This is the same strength of guarantee as with C++ exceptions.</p></li>
+
+<li><p>Works well in most configurations of C++, including C++ exceptions and RTTI globally disabled. Does not dynamically allocate memory.</p></li>
+</ul>
+
+<h4 id="cons">Cons:</h4>
+
+<ul>
+<li><p>Requires out of band storage for state e.g. thread local storage, or a global synchronised ring buffer<sup class="footnote-ref" id="fnref:2"><a href="#fn:2">2</a></sup>.</p>
+
+<ul>
+<li><p>If thread local storage is chosen as the out of band storage, transporting LEAF state across threads requires manual intervention.</p></li>
+
+<li><p>If a global ring buffer is chosen as the out of band storage, thread synchronisation with global state is required and the ring buffer can wrap which drops state.</p></li>
+</ul></li>
+
+<li><p>Thread local storage can be problematic or even a showstopper in many niche architectures such as HPC, GPUs, DSPs and microcontrollers. Global synchronised state can introduce an unacceptable performance impact on those architectures.</p></li>
+
+<li><p>Current compilers at the time of writing do not react well to use of thread local storage, it would seem that elision of code generation is inhibited if thread local state gets touched due to pessimistic assumptions about escape analysis. Given that this impacts all of C and C++ due to the same problem with <code>errno</code>, it is hoped that future compilers will improve this. Until then, any code which touches thread local storage or magic statics<sup class="footnote-ref" id="fnref:3"><a href="#fn:3">3</a></sup> will not optimise as well as code which does neither.</p></li>
+</ul>
+<div class="footnotes">
+
+<hr />
+
+<ol>
+<li id="fn:1">In Outcome, it is strongly recommended that one chooses a single universal error type for all public APIs such as <code>std::error_code</code> or <code>error</code> from Experimental.Outcome, so if the programmer is disciplined then the function signature does not expose internal error types. Such single universal error types type erase the original error object, but still allow the original error object to be inspected. This avoids &lsquo;exception specifications&rsquo; which are widely known to not scale well.
+ <a class="footnote-return" href="#fnref:1"><sup>[return]</sup></a></li>
+<li id="fn:2">A global synchronised ring buffer implementation does not ship with LEAF, however LEAF exposes customisation points for a bespoke thread local storage implementation which makes implementing one very straightforward.
+ <a class="footnote-return" href="#fnref:2"><sup>[return]</sup></a></li>
+<li id="fn:3"><code>std::error_code</code> construction touches a magic static or calls an extern function, and therefore Outcome when combined with <code>std::error_code</code> also sees a codegen pessimisation. Experimental Outcome&rsquo;s <code>error</code> fixes this historical oversight.
+ <a class="footnote-return" href="#fnref:3"><sup>[return]</sup></a></li>
+</ol>
+</div>
+
+
+        </div><p><small>Last revised: January 10, 2022 at 14:29:13 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../alternatives/outcome.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../alternatives.html"><img src="../images/up.png" alt="Up"></a>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Outcome (proposed std result) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../alternatives/expected.html"><img src="../images/prev.png" alt="Prev"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">Outcome (proposed std result)</h1></div></div></div>
+  <div class="toc"><dl class="toc">
+<dt>
+<dd><dl>
+<dt>
+<dd><dl>
+<dt>
+<dd><dl>
+<dt><a href="#pros">Pros:</a></dt>
+<dt><a href="#cons">Cons:</a></dt>
+</dl></dd></dt>
+</dl></dd></dt>
+</dl></dd></dt>
+</dl>
+  </div>
+  
+
+<p>Outcome (the library described by this documentation) originated in a negative reaction to then originally proposed <code>std::expected&lt;T, E&gt;</code>, though what got eventually standardised as <code>std::expected&lt;T, E&gt;</code> looks much more like Outcome&rsquo;s <code>result&lt;T, E&gt;</code> than the original Expected. <a href="../history.html">You can read here how those experiences led me to develop Outcome v1</a>. Outcome comes in both standalone and Boost editions, and its current design was completed in 2018.</p>
+
+<p>Outcome&rsquo;s core is two workhorse types and a macro:</p>
+
+<ul>
+<li><a href="../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+</li>
+
+<li><a href="../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+</li>
+
+<li><a href="../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+</li>
+</ul>
+
+<p>These three core items are then mixed into a veritable cornucopia of <a href="../reference/aliases.html">convenience typedefs</a> and variations to support a wide range of use cases, including <a href="../tutorial/essential/coroutines.html">in C++ coroutines</a>, plus there is extensive plumbing and customisation points for deciding how incompatible types ought to interact, or being notified of lifecycle events (e.g. capture a stack backtrace if a <code>result&lt;T, E&gt;</code> is constructed with an error).</p>
+
+<p>Outcome perfectly propagates constexpr, triviality and <code>noexcept</code>-ness of each individual operation of the types you configure it with. It never touches dynamic memory allocation, and it has been carefully written so the compiler will optimise it out of codegen entirely wherever that is possible. It is capable of &lsquo;true moves&rsquo; for types which declare themselves &lsquo;move bitcopying compatible&rsquo; i.e. destructor calls on moved-from values are elided. &lsquo;True moves&rsquo; can have a game changing performance gain on types with virtual destructors.</p>
+
+<p>Outcome takes a lot of care to have the least possible impact on build times, and it guarantees that a binary built with it will have stable ABI so it is safe to use in <em>really</em> large C++ codebases (standalone edition only). For interoperation with other languages, it guarantees that C code can work with Outcome data types, and it provides a C macro API header file to help with that.</p>
+
+<p>Outcome recognises Expected-like types and will construct from them, which aids interoperability. <a href="https://wg21.link/P1028">A simplified Result type is proposed for standardisation as <code>std::result&lt;T&gt;</code></a> where the <code>E</code> type is hard coded to a proposed <code>std::error</code>. This proposed standardisation has been deployed on billions of devices at the time of writing, and <a href="../experimental.html">you can use it today via Experimental.Outcome</a>, the reference implementation.</p>
+
+<h4 id="pros">Pros:</h4>
+
+<ul>
+<li><p>Predictable runtime overhead on the happy path.</p></li>
+
+<li><p>Predictable runtime overhead on the sad path.</p></li>
+
+<li><p>Very little codegen bloat added to binaries (though there is a fixed absolute overhead for support libraries if you use Outcome&rsquo;s bundled error types).</p></li>
+
+<li><p>Neither success nor failure is prioritised during use &ndash; types will implicitly construct from both <code>T</code> and <code>E</code> if it is unambiguous, so no clunky added markup needed to return an <code>E</code>.</p></li>
+
+<li><p>Sad path control flow is required to be explicitly specified in every situation. This significantly reduces the number of sad control flow paths in a code base, making it much easier to test all of them. It also means that sad paths get audited and checked during code reviews.</p></li>
+
+<li><p>Macro <code>TRY</code> operator feels a bit unnatural to use, but is a god send to saving visual code clutter when all you want to say is &lsquo;handle this failure by asking my caller to handle it&rsquo;. It also works with non-Outcome types, and has its own suite of customisation points for third party extension.</p></li>
+
+<li><p>Works well in all configurations of C++, including C++ exceptions and RTTI globally disabled.</p></li>
+
+<li><p>Works well on all niche architectures, such as HPC, GPUs, DSPs and microcontrollers, and does not dynamically allocate memory.</p></li>
+</ul>
+
+<h4 id="cons">Cons:</h4>
+
+<ul>
+<li><p>Sad path control flow is required to be explicitly specified in every situation. For code where failure is extremely unlikely, or is not important because it always results in aborting the current operation, the added visual code clutter is unhelpful.</p></li>
+
+<li><p>Results in branchy code, which is slow &ndash; though predictably so &ndash; for embedded controller CPUs.</p></li>
+
+<li><p>Failure to examine an Outcome type generates a compiler diagnostic, but failure to handle both failure and success does not. This can mean failures or successes get accidentally dropped.</p></li>
+
+<li><p>To prevent variant storage having an outsize impact on build times in the same way widespread use of <code>std::variant</code> has, Outcome only implements union storage when both <code>T</code> and <code>E</code> are trivially copyable or move bitcopying. Otherwise struct storage is used, which means Outcome&rsquo;s types are larger than Expected&rsquo;s. This is because implementing exception guarantees during copies and moves of non-trivially-copyable types in union storage involves a lot of work for the compiler on every use of copy and move, so by using struct storage Outcome reduces build time impact from copies and moves significantly.</p>
+
+<p>Note that one of the major uses of Outcome types is as the return type from a function, in which case copy elision would happen in C++ 14 and is guaranteed from C++ 17 onwards. This means that the larger footprint of struct storage typically has much less impact in optimised code than might be the case if you store these types inside other types.</p></li>
+</ul>
+
+
+        </div><p><small>Last revised: January 10, 2022 at 14:29:13 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../alternatives/expected.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../alternatives.html"><img src="../images/up.png" alt="Up"></a>
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diff --git a/doc/html/build.html b/doc/html/build.html
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index 000000000..063a725bb
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Build and install - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="./requirements.html"><img src="./images/prev.png" alt="Prev"></a>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">Build and install</h1></div></div></div>
+
+
+<h2 id="usage-as-a-single-header-file">Usage as a single header file</h2>
+
+<p>Outcome v2 comes in single header file form. This is regenerated per commit. To fetch
+on Linux:</p>
+
+<pre><code>wget https://github.com/ned14/outcome/raw/master/single-header/outcome.hpp
+</code></pre>
+
+<p>On BSD:</p>
+
+<pre><code>fetch https://github.com/ned14/outcome/raw/master/single-header/outcome.hpp
+</code></pre>
+
+<p>If you have <code>curl</code> installed:</p>
+
+<pre><code>curl -O -J -L https://github.com/ned14/outcome/raw/master/single-header/outcome.hpp
+</code></pre>
+
+<p>Otherwise, simply download the raw file from above and place it wherever it suits you.
+If you might be debugging using Microsoft Visual Studio, you may find the debugger
+visualisation file at <a href="https://github.com/ned14/outcome/raw/master/include/outcome/outcome.natvis">https://github.com/ned14/outcome/raw/master/include/outcome/outcome.natvis</a>
+useful to include into your build.</p>
+
+<h2 id="usage-from-the-vcpkg-package-manager">Usage from the vcpkg package manager</h2>
+
+<p>This is particularly easy, and works on Mac OS, Linux and Microsoft Windows:</p>
+
+<pre><code>vcpkg install outcome
+</code></pre>
+
+<p>Outcome appears at <code>&lt;boost/outcome/outcome.hpp&gt;</code>. This is a full copy of Outcome, so
+Experimental Outcome and all the usual headers are where you would expect.</p>
+
+<h2 id="usage-from-the-conan-package-manager">Usage from the Conan package manager</h2>
+
+<p><em>(thanks to Théo Delrieu for contributing this support)</em></p>
+
+<p>At the command line, add the bintray repo for Outcome to conan:</p>
+
+<pre><code>conan remote add outcome https://api.bintray.com/conan/ned14/Outcome
+</code></pre>
+
+<p>Now simply add this to your Conan build:</p>
+
+<pre><code>[requires]
+Outcome/master@ned14/stable
+</code></pre>
+
+<p>Outcome will be made available by Conan at <code>&lt;outcome.hpp&gt;</code>.</p>
+
+<h2 id="usage-from-the-cmake-hunter-package-manager">Usage from the cmake hunter package manager</h2>
+
+<p>Outcome has not been submitted to the main cmake hunter package manager repo yet.
+You can however add it as a git submodule:</p>
+
+<pre><code>cd yourthirdpartyrepodir
+git submodule add https://github.com/ned14/quickcpplib
+git submodule add https://github.com/ned14/outcome
+cd ..
+git submodule update --init --recursive
+</code></pre>
+
+<p>Now tell cmake hunter about a git submoduled cmake hunter package by
+adding to your project&rsquo;s <code>cmake/Hunter/config.cmake</code>:</p>
+
+<pre><code>hunter_config(quickcpplib GIT_SUBMODULE &quot;yourthirdpartyrepodir/quickcpplib&quot;)
+hunter_config(outcome GIT_SUBMODULE &quot;yourthirdpartyrepodir/outcome&quot;)
+</code></pre>
+
+<p>&hellip; and finally to your <code>CMakeLists.txt</code>, now add outcome as if it were
+an ordinary cmake hunter package:</p>
+
+<pre><code>hunter_add_package(quickcpplib)
+find_package(quickcpplib CONFIG REQUIRED)
+hunter_add_package(outcome)
+find_package(outcome CONFIG REQUIRED)
+</code></pre>
+
+<p>Now you tell cmake to link to outcome as usual (see below for cmake targets):</p>
+
+<pre><code>target_link_libraries(mytarget outcome::hl)
+</code></pre>
+
+<h2 id="usage-as-a-git-submodule">Usage as a git submodule</h2>
+
+<p>If you are very keen on tracking very latest Outcome, you can add it as a git
+submodule to your project so you can keep abreast of bug fixes. Here is how:</p>
+
+<pre><code>git submodule add https://github.com/ned14/outcome
+cd outcome
+git checkout master
+git submodule update --init --recursive
+</code></pre>
+
+<p>After this you can bring Outcome into your code using:</p>
+
+<pre><code>#include &quot;outcome/single-header/outcome.hpp&quot;
+</code></pre>
+
+<p>That&rsquo;s it, you are ready to go. From time to time, you may wish to update to
+latest:</p>
+
+<pre><code>cd outcome
+git pull
+git submodule update
+</code></pre>
+
+<h2 id="usage-as-a-stable-source-tarball">Usage as a stable source tarball</h2>
+
+<p>If you would prefer a single source tarball of the stable and develop branches
+known to have had all unit tests passing on all platforms, containing all the
+documentation, tests and sources, this can always be retrieved from:</p>
+
+<p><a href="https://github.com/ned14/outcome/releases">https://github.com/ned14/outcome/releases</a></p>
+
+<p>This tarball is automatically generated when Outcome fully compiles and passes
+all unit tests on all platforms tested by the CIs. This currently includes:</p>
+
+<ul>
+<li>Linux: GCC 7.5, clang 9, clang 11</li>
+<li>MacOS: XCode 12</li>
+<li>Windows: VS2019.7</li>
+</ul>
+
+<p>All unit tests are executed under the Address and Undefined Behaviour sanitisers.</p>
+
+<p>It should be emphasised that newer compilers are not tested, so there is
+an unlikely chance that the tarball may not work on a newer compiler.</p>
+
+<hr>
+
+<h1 id="running-the-unit-test-suite">Running the unit test suite</h1>
+
+<p>To run the unit test suite you will need cmake 3.3 or later installed.</p>
+
+<pre><code>mkdir build
+cd build
+cmake ..
+cmake --build .
+ctest
+</code></pre>
+
+<p>On some cmake generators (Visual Studio, Xcode) you may need to tell cmake build a configuration
+like Release or Debug. Similarly, ctest needs to be told the same e.g.</p>
+
+<pre><code>mkdir build
+cd build
+cmake ..
+cmake --build . --config Release
+ctest -C Release
+</code></pre>
+
+<p><a href="http://my.cdash.org/index.php?project=Boost.Outcome">Per commit, tests are run by Travis and uploaded to a CDash dashboard here</a>.</p>
+
+<hr>
+
+<h1 id="cmake-find-package-imported-targets-support">CMake <code>find_package()</code> imported targets support</h1>
+
+<p>Outcome fully complies with cmake install, so by installing Outcome, it can be
+found by cmake&rsquo;s <code>find_package()</code>.</p>
+
+<pre><code>mkdir build
+cd build
+cmake ..
+cmake --build .
+sudo cmake --build . --target install
+</code></pre>
+
+<h1 id="modular-cmake-build-support">Modular CMake build support</h1>
+
+<p>If you are using Outcome in a CMake project, Outcome is a &ldquo;modular cmake&rdquo; project
+using only modern cmake 3 throughout. This lets you add the Outcome directory as a
+cmake subdirectory with no unexpected consequence on the rest of your cmake. You will need
+to be using cmake 3.3 or better.</p>
+
+<pre><code>add_subdirectory(
+  &quot;${CMAKE_CURRENT_SOURCE_DIR}/outcome&quot;  # path to outcome source
+  &quot;${CMAKE_CURRENT_BINARY_DIR}/outcome&quot;  # your choice of where to put binaries
+  EXCLUDE_FROM_ALL                       # please only lazy build outcome on demand
+)
+</code></pre>
+
+<p>Outcome&rsquo;s cmake has the following useful products:</p>
+
+<ul>
+<li><code>outcome::hl</code> (target): the Outcome header-only library. Add this to any
+<code>target_link_libraries()</code> in your cmake to bring in Outcome as a header-only library. This will also
+add to your link (via <code>PUBLIC</code>) any debugger visualisation support files, any system library
+dependencies and also force all consuming executables to be configured with a minimum
+of C++ 14 as Outcome requires a minimum of that.</li>
+<li><code>outcome_TEST_TARGETS</code> (list): a list of targets which generate Outcome&rsquo;s test
+suite. You can append this to your own test suite if you wish to run Outcome&rsquo;s test
+suite along with your own.</li>
+</ul>
+
+
+
+        </div><p><small>Last revised: April 02, 2021 at 11:06:20 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./requirements.html"><img src="./images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/categories.html b/doc/html/categories.html
new file mode 100644
index 000000000..81801c4bd
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+++ b/doc/html/categories.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+
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+<div style="margin-bottom:2rem"></div>
+
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diff --git a/doc/html/categories/assignment.html b/doc/html/categories/assignment.html
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+++ b/doc/html/categories/assignment.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Assignment - Boost.Outcome documentation</title>
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
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+<hr>
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index 000000000..fb68b01fe
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@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/assignment.html</title><link rel="canonical" href="/categories/assignment.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/assignment.html" /></head></html>
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diff --git a/doc/html/categories/comparisons.html b/doc/html/categories/comparisons.html
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--- /dev/null
+++ b/doc/html/categories/comparisons.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+<hr>
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diff --git a/doc/html/categories/comparisons/page/1.html b/doc/html/categories/comparisons/page/1.html
new file mode 100644
index 000000000..44bb41aa3
--- /dev/null
+++ b/doc/html/categories/comparisons/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/comparisons.html</title><link rel="canonical" href="/categories/comparisons.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/comparisons.html" /></head></html>
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diff --git a/doc/html/categories/comparisons/page/2.html b/doc/html/categories/comparisons/page/2.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/categories/comparisons/page/2.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Comparisons - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+	
+</nav>
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+
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+<hr>
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diff --git a/doc/html/categories/constructors.html b/doc/html/categories/constructors.html
new file mode 100644
index 000000000..033a1f8cf
--- /dev/null
+++ b/doc/html/categories/constructors.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
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+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  7</span>
+	
+	    <a class="older-posts" href="../categories/constructors/page/2.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
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+   
+
+   
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+
+   
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+
+<div style="margin-bottom:2rem"></div>
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+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
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diff --git a/doc/html/categories/constructors/page/1.html b/doc/html/categories/constructors/page/1.html
new file mode 100644
index 000000000..97279bd31
--- /dev/null
+++ b/doc/html/categories/constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/constructors.html</title><link rel="canonical" href="/categories/constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/constructors.html" /></head></html>
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new file mode 100644
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--- /dev/null
+++ b/doc/html/categories/constructors/page/2.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+	    <a class="newer-posts" href="../../../categories/constructors.html">&larr; </a>
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+	
+</nav>
+
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+
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+
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+
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+   
+
+   
+
+   
+
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+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
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+	    <a class="newer-posts" href="../../../categories/constructors.html">&larr; </a>
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+</nav>
+
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+
+
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+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/categories/constructors/page/3.html b/doc/html/categories/constructors/page/3.html
new file mode 100644
index 000000000..98a2bb54c
--- /dev/null
+++ b/doc/html/categories/constructors/page/3.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Constructors - Boost.Outcome documentation</title>
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+	
+</nav>
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+
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+   
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+
+   
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+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
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+	    <a class="newer-posts" href="../../../categories/constructors/page/2.html">&larr; </a>
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+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/categories/constructors/page/4.html b/doc/html/categories/constructors/page/4.html
new file mode 100644
index 000000000..deba9937a
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+++ b/doc/html/categories/constructors/page/4.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+
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+   
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+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
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+	    <a class="newer-posts" href="../../../categories/constructors/page/3.html">&larr; </a>
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+</nav>
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+
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+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/categories/constructors/page/5.html b/doc/html/categories/constructors/page/5.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/categories/constructors/page/5.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/constructors/page/4.html">&larr; </a>
+	
+	<span class="page-number"> 5  7</span>
+	
+	    <a class="older-posts" href="../../../categories/constructors/page/6.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/constructors/page/4.html">&larr; </a>
+	
+	<span class="page-number"> 5  7</span>
+	
+	    <a class="older-posts" href="../../../categories/constructors/page/6.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/constructors/page/6.html b/doc/html/categories/constructors/page/6.html
new file mode 100644
index 000000000..50af681fa
--- /dev/null
+++ b/doc/html/categories/constructors/page/6.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/constructors/page/5.html">&larr; </a>
+	
+	<span class="page-number"> 6  7</span>
+	
+	    <a class="older-posts" href="../../../categories/constructors/page/7.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/constructors/page/5.html">&larr; </a>
+	
+	<span class="page-number"> 6  7</span>
+	
+	    <a class="older-posts" href="../../../categories/constructors/page/7.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/constructors/page/7.html b/doc/html/categories/constructors/page/7.html
new file mode 100644
index 000000000..cdc876b62
--- /dev/null
+++ b/doc/html/categories/constructors/page/7.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/constructors/page/6.html">&larr; </a>
+	
+	<span class="page-number"> 7  7</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/constructors/page/6.html">&larr; </a>
+	
+	<span class="page-number"> 7  7</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/converting-constructors.html b/doc/html/categories/converting-constructors.html
new file mode 100644
index 000000000..5be5bf2e4
--- /dev/null
+++ b/doc/html/categories/converting-constructors.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Converting Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  3</span>
+	
+	    <a class="older-posts" href="../categories/converting-constructors/page/2.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  3</span>
+	
+	    <a class="older-posts" href="../categories/converting-constructors/page/2.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/converting-constructors/page/1.html b/doc/html/categories/converting-constructors/page/1.html
new file mode 100644
index 000000000..9faa210b3
--- /dev/null
+++ b/doc/html/categories/converting-constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/converting-constructors.html</title><link rel="canonical" href="/categories/converting-constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/converting-constructors.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/converting-constructors/page/2.html b/doc/html/categories/converting-constructors/page/2.html
new file mode 100644
index 000000000..e166ce5e7
--- /dev/null
+++ b/doc/html/categories/converting-constructors/page/2.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Converting Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/converting-constructors.html">&larr; </a>
+	
+	<span class="page-number"> 2  3</span>
+	
+	    <a class="older-posts" href="../../../categories/converting-constructors/page/3.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/converting-constructors.html">&larr; </a>
+	
+	<span class="page-number"> 2  3</span>
+	
+	    <a class="older-posts" href="../../../categories/converting-constructors/page/3.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/converting-constructors/page/3.html b/doc/html/categories/converting-constructors/page/3.html
new file mode 100644
index 000000000..75e941515
--- /dev/null
+++ b/doc/html/categories/converting-constructors/page/3.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Converting Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/converting-constructors/page/2.html">&larr; </a>
+	
+	<span class="page-number"> 3  3</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/converting-constructors/page/2.html">&larr; </a>
+	
+	<span class="page-number"> 3  3</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/copy-assignment.html b/doc/html/categories/copy-assignment.html
new file mode 100644
index 000000000..5e30c7060
--- /dev/null
+++ b/doc/html/categories/copy-assignment.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Copy Assignment - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/copy-assignment/page/1.html b/doc/html/categories/copy-assignment/page/1.html
new file mode 100644
index 000000000..cc49505a5
--- /dev/null
+++ b/doc/html/categories/copy-assignment/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/copy-assignment.html</title><link rel="canonical" href="/categories/copy-assignment.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/copy-assignment.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/copy-constructors.html b/doc/html/categories/copy-constructors.html
new file mode 100644
index 000000000..a85a8fc9c
--- /dev/null
+++ b/doc/html/categories/copy-constructors.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Copy Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/copy-constructors/page/1.html b/doc/html/categories/copy-constructors/page/1.html
new file mode 100644
index 000000000..f24eaeba2
--- /dev/null
+++ b/doc/html/categories/copy-constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/copy-constructors.html</title><link rel="canonical" href="/categories/copy-constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/copy-constructors.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/default-constructors.html b/doc/html/categories/default-constructors.html
new file mode 100644
index 000000000..9eeded737
--- /dev/null
+++ b/doc/html/categories/default-constructors.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Default Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 15, 2018 at 17:49:37 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/default-constructors/page/1.html b/doc/html/categories/default-constructors/page/1.html
new file mode 100644
index 000000000..34fc2b4c1
--- /dev/null
+++ b/doc/html/categories/default-constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/default-constructors.html</title><link rel="canonical" href="/categories/default-constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/default-constructors.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/destructors.html b/doc/html/categories/destructors.html
new file mode 100644
index 000000000..5d7b80dbd
--- /dev/null
+++ b/doc/html/categories/destructors.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Destructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 15, 2018 at 17:49:37 UTC</small></p>
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diff --git a/doc/html/categories/destructors/page/1.html b/doc/html/categories/destructors/page/1.html
new file mode 100644
index 000000000..138208598
--- /dev/null
+++ b/doc/html/categories/destructors/page/1.html
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+<!DOCTYPE html><html><head><title>/categories/destructors.html</title><link rel="canonical" href="/categories/destructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/destructors.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/disabling-constructors.html b/doc/html/categories/disabling-constructors.html
new file mode 100644
index 000000000..d102794cd
--- /dev/null
+++ b/doc/html/categories/disabling-constructors.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+
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+	<span class="page-number"> 1  1</span>
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+<nav class="pagination" role="navigation">
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+	<span class="page-number"> 1  1</span>
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+
+
+        </div><p><small>Last revised: December 15, 2018 at 17:49:37 UTC</small></p>
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diff --git a/doc/html/categories/disabling-constructors/page/1.html b/doc/html/categories/disabling-constructors/page/1.html
new file mode 100644
index 000000000..82d6024dd
--- /dev/null
+++ b/doc/html/categories/disabling-constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/disabling-constructors.html</title><link rel="canonical" href="/categories/disabling-constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/disabling-constructors.html" /></head></html>
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diff --git a/doc/html/categories/explicit-constructors.html b/doc/html/categories/explicit-constructors.html
new file mode 100644
index 000000000..b2da0cff7
--- /dev/null
+++ b/doc/html/categories/explicit-constructors.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Explicit Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
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+	<span class="page-number"> 1  3</span>
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+	    <a class="older-posts" href="../categories/explicit-constructors/page/2.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  3</span>
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+	    <a class="older-posts" href="../categories/explicit-constructors/page/2.html"> &rarr;</a>
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+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
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diff --git a/doc/html/categories/explicit-constructors/page/1.html b/doc/html/categories/explicit-constructors/page/1.html
new file mode 100644
index 000000000..2930f6c8d
--- /dev/null
+++ b/doc/html/categories/explicit-constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/explicit-constructors.html</title><link rel="canonical" href="/categories/explicit-constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/explicit-constructors.html" /></head></html>
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new file mode 100644
index 000000000..bfa66c0fc
--- /dev/null
+++ b/doc/html/categories/explicit-constructors/page/2.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Explicit Constructors - Boost.Outcome documentation</title>
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+<nav class="pagination" role="navigation">
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+	    <a class="newer-posts" href="../../../categories/explicit-constructors.html">&larr; </a>
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+	<span class="page-number"> 2  3</span>
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+	
+</nav>
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+
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+   
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+   
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+   
+
+   
+
+   
+
+   
+
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+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/explicit-constructors.html">&larr; </a>
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+	<span class="page-number"> 2  3</span>
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+	    <a class="older-posts" href="../../../categories/explicit-constructors/page/3.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
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+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/categories/explicit-constructors/page/3.html b/doc/html/categories/explicit-constructors/page/3.html
new file mode 100644
index 000000000..934c8e9e7
--- /dev/null
+++ b/doc/html/categories/explicit-constructors/page/3.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Explicit Constructors - Boost.Outcome documentation</title>
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+	    <a class="newer-posts" href="../../../categories/explicit-constructors/page/2.html">&larr; </a>
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+   
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+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
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+	    <a class="newer-posts" href="../../../categories/explicit-constructors/page/2.html">&larr; </a>
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+	<span class="page-number"> 3  3</span>
+	
+</nav>
+
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+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
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+</html>
diff --git a/doc/html/categories/implicit-constructors.html b/doc/html/categories/implicit-constructors.html
new file mode 100644
index 000000000..01ca0ed71
--- /dev/null
+++ b/doc/html/categories/implicit-constructors.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Implicit Constructors - Boost.Outcome documentation</title>
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+<nav class="pagination" role="navigation">
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+</nav>
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+</div>
+
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+   
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+   
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+   
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+   
+
+   
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+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
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+	<span class="page-number"> 1  4</span>
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+	    <a class="older-posts" href="../categories/implicit-constructors/page/2.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
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+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/categories/implicit-constructors/page/1.html b/doc/html/categories/implicit-constructors/page/1.html
new file mode 100644
index 000000000..bd87ad19b
--- /dev/null
+++ b/doc/html/categories/implicit-constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/implicit-constructors.html</title><link rel="canonical" href="/categories/implicit-constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/implicit-constructors.html" /></head></html>
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diff --git a/doc/html/categories/implicit-constructors/page/2.html b/doc/html/categories/implicit-constructors/page/2.html
new file mode 100644
index 000000000..f4aef37ef
--- /dev/null
+++ b/doc/html/categories/implicit-constructors/page/2.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Implicit Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+<nav class="pagination" role="navigation">
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+	    <a class="newer-posts" href="../../../categories/implicit-constructors.html">&larr; </a>
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+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
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+<nav class="pagination" role="navigation">
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+	    <a class="newer-posts" href="../../../categories/implicit-constructors.html">&larr; </a>
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+	    <a class="older-posts" href="../../../categories/implicit-constructors/page/3.html"> &rarr;</a>
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+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/categories/implicit-constructors/page/3.html b/doc/html/categories/implicit-constructors/page/3.html
new file mode 100644
index 000000000..76524e34b
--- /dev/null
+++ b/doc/html/categories/implicit-constructors/page/3.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+	    <a class="newer-posts" href="../../../categories/implicit-constructors/page/2.html">&larr; </a>
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+
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+   
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+   
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+   
+
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+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
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+	    <a class="newer-posts" href="../../../categories/implicit-constructors/page/2.html">&larr; </a>
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diff --git a/doc/html/categories/implicit-constructors/page/4.html b/doc/html/categories/implicit-constructors/page/4.html
new file mode 100644
index 000000000..63d77e3c6
--- /dev/null
+++ b/doc/html/categories/implicit-constructors/page/4.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+	    <a class="newer-posts" href="../../../categories/implicit-constructors/page/3.html">&larr; </a>
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+	<span class="page-number"> 4  4</span>
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+</nav>
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+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
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diff --git a/doc/html/categories/inplace-constructors.html b/doc/html/categories/inplace-constructors.html
new file mode 100644
index 000000000..46ea0cf44
--- /dev/null
+++ b/doc/html/categories/inplace-constructors.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Inplace Constructors - Boost.Outcome documentation</title>
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  2</span>
+	
+	    <a class="older-posts" href="../categories/inplace-constructors/page/2.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  2</span>
+	
+	    <a class="older-posts" href="../categories/inplace-constructors/page/2.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/inplace-constructors/page/1.html b/doc/html/categories/inplace-constructors/page/1.html
new file mode 100644
index 000000000..636b25284
--- /dev/null
+++ b/doc/html/categories/inplace-constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/inplace-constructors.html</title><link rel="canonical" href="/categories/inplace-constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/inplace-constructors.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/inplace-constructors/page/2.html b/doc/html/categories/inplace-constructors/page/2.html
new file mode 100644
index 000000000..ac066bde0
--- /dev/null
+++ b/doc/html/categories/inplace-constructors/page/2.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Inplace Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/inplace-constructors.html">&larr; </a>
+	
+	<span class="page-number"> 2  2</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/inplace-constructors.html">&larr; </a>
+	
+	<span class="page-number"> 2  2</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/modifiers.html b/doc/html/categories/modifiers.html
new file mode 100644
index 000000000..36ca515f2
--- /dev/null
+++ b/doc/html/categories/modifiers.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Modifiers - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: June 25, 2019 at 17:01:21 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/modifiers/page/1.html b/doc/html/categories/modifiers/page/1.html
new file mode 100644
index 000000000..0ee7c9393
--- /dev/null
+++ b/doc/html/categories/modifiers/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/modifiers.html</title><link rel="canonical" href="/categories/modifiers.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/modifiers.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/move-assignment.html b/doc/html/categories/move-assignment.html
new file mode 100644
index 000000000..1044d19d5
--- /dev/null
+++ b/doc/html/categories/move-assignment.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Move Assignment - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/move-assignment/page/1.html b/doc/html/categories/move-assignment/page/1.html
new file mode 100644
index 000000000..29462e714
--- /dev/null
+++ b/doc/html/categories/move-assignment/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/move-assignment.html</title><link rel="canonical" href="/categories/move-assignment.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/move-assignment.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/move-constructors.html b/doc/html/categories/move-constructors.html
new file mode 100644
index 000000000..ed02c92da
--- /dev/null
+++ b/doc/html/categories/move-constructors.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Move Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/move-constructors/page/1.html b/doc/html/categories/move-constructors/page/1.html
new file mode 100644
index 000000000..19bc87da0
--- /dev/null
+++ b/doc/html/categories/move-constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/move-constructors.html</title><link rel="canonical" href="/categories/move-constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/move-constructors.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/observer-policies.html b/doc/html/categories/observer-policies.html
new file mode 100644
index 000000000..b53becff0
--- /dev/null
+++ b/doc/html/categories/observer-policies.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Observer Policies - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  2</span>
+	
+	    <a class="older-posts" href="../categories/observer-policies/page/2.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  2</span>
+	
+	    <a class="older-posts" href="../categories/observer-policies/page/2.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/observer-policies/page/1.html b/doc/html/categories/observer-policies/page/1.html
new file mode 100644
index 000000000..426db3f18
--- /dev/null
+++ b/doc/html/categories/observer-policies/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/observer-policies.html</title><link rel="canonical" href="/categories/observer-policies.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/observer-policies.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/observer-policies/page/2.html b/doc/html/categories/observer-policies/page/2.html
new file mode 100644
index 000000000..0e02ae757
--- /dev/null
+++ b/doc/html/categories/observer-policies/page/2.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Observer Policies - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observer-policies.html">&larr; </a>
+	
+	<span class="page-number"> 2  2</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observer-policies.html">&larr; </a>
+	
+	<span class="page-number"> 2  2</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/observers.html b/doc/html/categories/observers.html
new file mode 100644
index 000000000..568817519
--- /dev/null
+++ b/doc/html/categories/observers.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Observers - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  7</span>
+	
+	    <a class="older-posts" href="../categories/observers/page/2.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  7</span>
+	
+	    <a class="older-posts" href="../categories/observers/page/2.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/observers/page/1.html b/doc/html/categories/observers/page/1.html
new file mode 100644
index 000000000..0512d38ef
--- /dev/null
+++ b/doc/html/categories/observers/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/observers.html</title><link rel="canonical" href="/categories/observers.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/observers.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/observers/page/2.html b/doc/html/categories/observers/page/2.html
new file mode 100644
index 000000000..4308c1cc6
--- /dev/null
+++ b/doc/html/categories/observers/page/2.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Observers - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observers.html">&larr; </a>
+	
+	<span class="page-number"> 2  7</span>
+	
+	    <a class="older-posts" href="../../../categories/observers/page/3.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observers.html">&larr; </a>
+	
+	<span class="page-number"> 2  7</span>
+	
+	    <a class="older-posts" href="../../../categories/observers/page/3.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/observers/page/3.html b/doc/html/categories/observers/page/3.html
new file mode 100644
index 000000000..e3e4db324
--- /dev/null
+++ b/doc/html/categories/observers/page/3.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Observers - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+
+
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observers/page/2.html">&larr; </a>
+	
+	<span class="page-number"> 3  7</span>
+	
+	    <a class="older-posts" href="../../../categories/observers/page/4.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observers/page/2.html">&larr; </a>
+	
+	<span class="page-number"> 3  7</span>
+	
+	    <a class="older-posts" href="../../../categories/observers/page/4.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/categories/observers/page/4.html b/doc/html/categories/observers/page/4.html
new file mode 100644
index 000000000..3bae7086f
--- /dev/null
+++ b/doc/html/categories/observers/page/4.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Observers - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observers/page/3.html">&larr; </a>
+	
+	<span class="page-number"> 4  7</span>
+	
+	    <a class="older-posts" href="../../../categories/observers/page/5.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observers/page/3.html">&larr; </a>
+	
+	<span class="page-number"> 4  7</span>
+	
+	    <a class="older-posts" href="../../../categories/observers/page/5.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/observers/page/5.html b/doc/html/categories/observers/page/5.html
new file mode 100644
index 000000000..5fd025021
--- /dev/null
+++ b/doc/html/categories/observers/page/5.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Observers - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observers/page/4.html">&larr; </a>
+	
+	<span class="page-number"> 5  7</span>
+	
+	    <a class="older-posts" href="../../../categories/observers/page/6.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observers/page/4.html">&larr; </a>
+	
+	<span class="page-number"> 5  7</span>
+	
+	    <a class="older-posts" href="../../../categories/observers/page/6.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/observers/page/6.html b/doc/html/categories/observers/page/6.html
new file mode 100644
index 000000000..a61ee5f74
--- /dev/null
+++ b/doc/html/categories/observers/page/6.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Observers - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
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+<nav class="pagination" role="navigation">
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+	    <a class="newer-posts" href="../../../categories/observers/page/5.html">&larr; </a>
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+	<span class="page-number"> 6  7</span>
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+	    <a class="older-posts" href="../../../categories/observers/page/7.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
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+   
+
+   
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+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observers/page/5.html">&larr; </a>
+	
+	<span class="page-number"> 6  7</span>
+	
+	    <a class="older-posts" href="../../../categories/observers/page/7.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/observers/page/7.html b/doc/html/categories/observers/page/7.html
new file mode 100644
index 000000000..3e4029617
--- /dev/null
+++ b/doc/html/categories/observers/page/7.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Observers - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../../categories/observers/page/6.html">&larr; </a>
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+	<span class="page-number"> 7  7</span>
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+</nav>
+
+</div>
+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
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+	    <a class="newer-posts" href="../../../categories/observers/page/6.html">&larr; </a>
+	
+	<span class="page-number"> 7  7</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../history.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../requirements.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/operators.html b/doc/html/categories/operators.html
new file mode 100644
index 000000000..98d7bf0d8
--- /dev/null
+++ b/doc/html/categories/operators.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Operators - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/operators/page/1.html b/doc/html/categories/operators/page/1.html
new file mode 100644
index 000000000..cf6890974
--- /dev/null
+++ b/doc/html/categories/operators/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/operators.html</title><link rel="canonical" href="/categories/operators.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/operators.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/page/1.html b/doc/html/categories/page/1.html
new file mode 100644
index 000000000..6ce8fc93f
--- /dev/null
+++ b/doc/html/categories/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories.html</title><link rel="canonical" href="/categories.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/page/2.html b/doc/html/categories/page/2.html
new file mode 100644
index 000000000..e4298d5f2
--- /dev/null
+++ b/doc/html/categories/page/2.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Categories - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
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+<body><div class="spirit-nav">
+<a accesskey="p" href="../../history.html"><img src="../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../requirements.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../categories.html">&larr; </a>
+	
+	<span class="page-number"> 2  2</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../categories.html">&larr; </a>
+	
+	<span class="page-number"> 2  2</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../history.html"><img src="../../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../requirements.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/special.html b/doc/html/categories/special.html
new file mode 100644
index 000000000..40e0ebe02
--- /dev/null
+++ b/doc/html/categories/special.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Special - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 16, 2023 at 20:51:26 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/special/page/1.html b/doc/html/categories/special/page/1.html
new file mode 100644
index 000000000..ac3852f02
--- /dev/null
+++ b/doc/html/categories/special/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/special.html</title><link rel="canonical" href="/categories/special.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/special.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/tagged-constructors.html b/doc/html/categories/tagged-constructors.html
new file mode 100644
index 000000000..9f27f37e8
--- /dev/null
+++ b/doc/html/categories/tagged-constructors.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Tagged Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  2</span>
+	
+	    <a class="older-posts" href="../categories/tagged-constructors/page/2.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  2</span>
+	
+	    <a class="older-posts" href="../categories/tagged-constructors/page/2.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/categories/tagged-constructors/page/1.html b/doc/html/categories/tagged-constructors/page/1.html
new file mode 100644
index 000000000..56693d10b
--- /dev/null
+++ b/doc/html/categories/tagged-constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/categories/tagged-constructors.html</title><link rel="canonical" href="/categories/tagged-constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/categories/tagged-constructors.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/categories/tagged-constructors/page/2.html b/doc/html/categories/tagged-constructors/page/2.html
new file mode 100644
index 000000000..c173c3565
--- /dev/null
+++ b/doc/html/categories/tagged-constructors/page/2.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">Changelog</h1></div></div></div>
+  <div class="toc"><dl class="toc">
+<dt>
+<dd><dl>
+<dt><a href="#v2-2-11-boost-1-87-release-https-github-com-ned14-outcome-releases-tag-v2-2-11">v2.2.11 ? (Boost 1.87) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.11">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements">Enhancements:</a></dt>
+<dt><a href="#bug-fixes">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-2-10-14th-august-2024-boost-1-86-release-https-github-com-ned14-outcome-releases-tag-v2-2-10">v2.2.10 14th August 2024 (Boost 1.86) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.10">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-1">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-1">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-2-9-15th-april-2024-boost-1-85-release-https-github-com-ned14-outcome-releases-tag-v2-2-9">v2.2.9 15th April 2024 (Boost 1.85) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.9">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-2">Enhancements:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-2-8-13th-december-2023-boost-1-84-release-https-github-com-ned14-outcome-releases-tag-v2-2-8">v2.2.8 13th December 2023 (Boost 1.84) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.8">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-3">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-2">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-2-7-13th-august-2023-boost-1-83-release-https-github-com-ned14-outcome-releases-tag-v2-2-7">v2.2.7 13th August 2023 (Boost 1.83) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.7">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-4">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-3">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-2-6-24th-march-2023-boost-1-82-release-https-github-com-ned14-outcome-releases-tag-v2-2-6">v2.2.6 24th March 2023 (Boost 1.82) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.6">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-5">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-4">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-2-4-11th-august-2022-boost-1-80-release-https-github-com-ned14-outcome-releases-tag-v2-2-4">v2.2.4 11th August 2022 (Boost 1.80) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.4">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-6">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-5">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-2-3-17th-march-2022-boost-1-79-release-https-github-com-ned14-outcome-releases-tag-v2-2-3">v2.2.3 17th March 2022 (Boost 1.79) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.3">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-7">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-6">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-2-2-8th-december-2021-boost-1-78-release-https-github-com-ned14-outcome-releases-tag-v2-2-2">v2.2.2 8th December 2021 (Boost 1.78) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.2">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-8">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-7">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-2-1-13th-august-2021-boost-1-77-release-https-github-com-ned14-outcome-releases-tag-v2-2-1">v2.2.1 13th August 2021 (Boost 1.77) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.1">[release]</a></a>
+<dd><dl>
+<dt><a href="#bug-fixes-8">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-2-0-16th-april-2021-boost-1-76-release-https-github-com-ned14-outcome-releases-tag-v2-2-0">v2.2.0 16th April 2021 (Boost 1.76) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.0">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-9">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-9">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-1-5-11th-december-2020-boost-1-75-release-https-github-com-ned14-outcome-releases-tag-v2-1-5">v2.1.5 11th December 2020 (Boost 1.75) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.5">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-10">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-10">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-1-4-14th-august-2020-boost-1-74-release-https-github-com-ned14-outcome-releases-tag-v2-1-4">v2.1.4 14th August 2020 (Boost 1.74) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.4">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-11">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-11">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-1-3-29th-april-2020-boost-1-73-release-https-github-com-ned14-outcome-releases-tag-v2-1-3">v2.1.3 29th April 2020 (Boost 1.73) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.3">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-12">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-12">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-1-2-11th-december-2019-boost-1-72-release-https-github-com-ned14-outcome-releases-tag-v2-1-2">v2.1.2 11th December 2019 (Boost 1.72) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.2">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-13">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-13">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-1-1-19th-august-2019-boost-1-71-release-https-github-com-ned14-outcome-releases-tag-v2-1-1">v2.1.1 19th August 2019 (Boost 1.71) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.1">[release]</a></a>
+<dd><dl>
+<dt><a href="#enhancements-14">Enhancements:</a></dt>
+<dt><a href="#bug-fixes-14">Bug fixes:</a></dt>
+</dl></dd></dt>
+<dt><a href="#v2-1-12th-apr-2019-boost-1-70-release-https-github-com-ned14-outcome-releases-tag-v2-1">v2.1 12th Apr 2019 (Boost 1.70) <a href="https://github.com/ned14/outcome/releases/tag/v2.1">[release]</a></a></dt>
+<dt><a href="#v2-0-18th-jan-2018-release-https-github-com-ned14-outcome-releases-tag-v2-0-boost-peer-review">v2.0 18th Jan 2018 <a href="https://github.com/ned14/outcome/releases/tag/v2.0-boost-peer-review">[release]</a></a></dt>
+</dl></dd></dt>
+</dl>
+  </div>
+
+
+<hr />
+
+<h2 id="v2-2-11-boost-1-87-release-https-github-com-ned14-outcome-releases-tag-v2-2-11">v2.2.11 ? (Boost 1.87) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.11">[release]</a></h2>
+
+<h3 id="enhancements">Enhancements:</h3>
+
+<ul>
+<li>Outcome.Experimental has had C representation support since the beginning, however it had
+been mainly intended that C++ would originate Results, they would pass through C, and back
+into C++. It hadn&rsquo;t really been expected that C would want to do much with Results other than
+inspect them for happy or sad path.</li>
+</ul>
+
+<p>It turns out there is more demand than expected for a more functional Result from within C,
+so this release adds the power to create Results in success and two types of failure, semantic
+comparison of Results, and printing of Result messages. You can also wrap a C enum into a
+quick status code from enum, allowing easy custom C error coding from 100% within C.</p>
+
+<p><a href="./experimental/c-api.html">The documentation for the C support</a> has been updated
+to reflect the new facilities.</p>
+
+<h3 id="bug-fixes">Bug fixes:</h3>
+
+<ul>
+<li>This was fixed in Standalone Outcome in the last release, but the fix came too late for Boost.Outcome
+which ended up shipping with inline GDB pretty printers with the wrong escaping which caused
+failure to load.</li>
+</ul>
+
+<hr />
+
+<h2 id="v2-2-10-14th-august-2024-boost-1-86-release-https-github-com-ned14-outcome-releases-tag-v2-2-10">v2.2.10 14th August 2024 (Boost 1.86) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.10">[release]</a></h2>
+
+<h3 id="enhancements-1">Enhancements:</h3>
+
+<ul>
+<li>Something I&rsquo;ve been meaning to do for far too long now is make the GDB pretty printers
+auto-loading so you don&rsquo;t have to set up <code>.gdbinit</code>. This is now done. I also improved
+the pretty printers to also pretty print the C result type which can be very useful if
+working with that type, as it will print the error message in GDB.</li>
+</ul>
+
+<p>Experimental Outcome&rsquo;s <code>status_code</code> has also gained its own auto-loading GDB pretty printer
+with display of <code>strerror()</code> if the code domain is POSIX or generic.</p>
+
+<h3 id="bug-fixes-1">Bug fixes:</h3>
+
+<ul>
+<li>The <code>status</code> enumeration used to track state internally did not list all possible enum
+values. This caused static analysers to complain.</li>
+</ul>
+
+<hr />
+
+<h2 id="v2-2-9-15th-april-2024-boost-1-85-release-https-github-com-ned14-outcome-releases-tag-v2-2-9">v2.2.9 15th April 2024 (Boost 1.85) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.9">[release]</a></h2>
+
+<h3 id="enhancements-2">Enhancements:</h3>
+
+<p><a href="https://github.com/ned14/outcome/issues/293">#293</a>
+- Some users wished that Outcome would be clean with <code>-Wpedantic</code>, this is now turned on for
+the test suite.</p>
+
+<p><a href="https://github.com/ned14/outcome/issues/294">#294</a>
+- All use of <code>assert()</code> has been replaced with <code>BOOST_OUTCOME_ASSERT</code>, which can be user overridden
+at compile time.</p>
+
+<p><a href="https://github.com/ned14/outcome/issues/295">#295</a>
+- In git commit 12b14e1533848e9a0f7f3c38e41da0ee4e819770 (Aug 11 2022) status code had its
+paths changed due to its headers not previously having the right path convention. It was not
+realised at the time that in Boost.Outcome this resulted in
+<code>&lt;boost/outcome/experimental/status-code/status-code/headers.hpp&gt;</code> which is not desirable.
+This has now been remedied to remove the double <code>status-code</code>, which will obviously break
+any Boost.Outcome code which relies on the double <code>status-code</code>. Standalone Outcome is unaffected.</p>
+
+<hr />
+
+<h2 id="v2-2-8-13th-december-2023-boost-1-84-release-https-github-com-ned14-outcome-releases-tag-v2-2-8">v2.2.8 13th December 2023 (Boost 1.84) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.8">[release]</a></h2>
+
+<h3 id="enhancements-3">Enhancements:</h3>
+
+<ul>
+<li>cmake 3.9 is now the minimum required for standalone Outcome. This fixes a long standing
+cmake issue with probing for standard library facilities. cmake 3.9 is what RHEL7 ships with,
+when RHEL7 EOLs we may raise the minimum cmake version at that point.</li>
+</ul>
+
+<h3 id="bug-fixes-2">Bug fixes:</h3>
+
+<ul>
+<li>There was a bug in the Outcome C++ coroutine awaitables whereby we were over eagerly resuming
+execution of coroutines which return one of our awaitables. It is surprising how many years have
+passed before this was noticed, but it is now fixed. It is believed that this has been fixed
+without affecting ABI stability, however mixing old Outcome and new Outcome in the same binary
+without recompiling all the C++ coroutine code to use new Outcome will not fix the bug.</li>
+</ul>
+
+<p><a href="https://github.com/ned14/outcome/issues/291">#291</a>
+- A Result or Outcome with <code>void</code> value type and move-only non-value type was only usable in
+const use cases, due to the lack of provision of non-const member functions in relevant observers
+injection layers for the <code>void</code> specialisation. The missing non-const member functions have now
+been added.</p>
+
+<hr />
+
+<h2 id="v2-2-7-13th-august-2023-boost-1-83-release-https-github-com-ned14-outcome-releases-tag-v2-2-7">v2.2.7 13th August 2023 (Boost 1.83) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.7">[release]</a></h2>
+
+<h3 id="enhancements-4">Enhancements:</h3>
+
+<ul>
+<li><p>Update the list of known compiler issues in the docs.</p></li>
+
+<li><p>Update Outcome.Experimental to match latest changes requested of <code>status_code</code> by WG21.
+This as usual will cause minor breakage due to LEWG renaming of things.</p></li>
+
+<li><p>Outcome previously took addresses of things not using <code>std::addressof()</code>, and until now
+nobody complained because custom <code>operator&amp;</code> which doesn&rsquo;t return an address is an
+abomination not used in much modern C++. But finally someone did complain, so
+for both normal Outcome and Experimental.Outcome, if you set <code>BOOST_OUTCOME_USE_STD_ADDRESSOF = 1</code>,
+Outcome will use <code>std::addressof()</code></p></li>
+</ul>
+
+<h3 id="bug-fixes-3">Bug fixes:</h3>
+
+<p><a href="https://github.com/ned14/outcome/issues/273">#273</a>
+- Changes to other Boost libraries had caused Boost.Outcome&rsquo;s test suite to fail to compile for some
+compiler and C++ language configurations in recent releases. Thanks to work contributed by @alandefreitas
+and @pdimov, Boost.Outcome now CI tests a wide range of compilers and configurations and it
+is believed all those corner case issues have been fixed or worked around, for the compilers
+and configurations within that CI matrix.</p>
+
+<p>Standalone Outcome&rsquo;s test suite was never affected, as it did not have Boost changing underneath it.
+Nevertheless, a few of the compiler parse bug workarounds will have improved compatibility there
+too for atyical toolchain choices.</p>
+
+<ul>
+<li>Experimental.Outcome now supports big endian architectures. Implementation for them simply wasn&rsquo;t done
+before under the assumption that nobody would be using Experimental.Outcome on big endian architectures.
+Turns out that was a wrong assumption!</li>
+</ul>
+
+<hr />
+
+<h2 id="v2-2-6-24th-march-2023-boost-1-82-release-https-github-com-ned14-outcome-releases-tag-v2-2-6">v2.2.6 24th March 2023 (Boost 1.82) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.6">[release]</a></h2>
+
+<h3 id="enhancements-5">Enhancements:</h3>
+
+<ul>
+<li>Update to latest <code>status-code</code> in Experimental.Outcome, which relocates its header files and may
+cause some end user inclusions to need path changes.</li>
+</ul>
+
+<h3 id="bug-fixes-4">Bug fixes:</h3>
+
+<ul>
+<li>Latest <code>status-code</code> fixes a number of nasty bugs, some mild build breakage in Experimental.Outcome
+may occur as a result. See its commit log for more information.</li>
+</ul>
+
+<hr />
+
+<h2 id="v2-2-4-11th-august-2022-boost-1-80-release-https-github-com-ned14-outcome-releases-tag-v2-2-4">v2.2.4 11th August 2022 (Boost 1.80) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.4">[release]</a></h2>
+
+<h3 id="enhancements-6">Enhancements:</h3>
+
+<ul>
+<li><p>Update to latest <code>status-code</code> in Experimental.Outcome, which has some breaking changes and important
+bug fixes.</p></li>
+
+<li><p>Add <a href="./reference/types/awaitables/generator.html" class="api-reference"><code>generator&lt;T, Executor = void&gt;</code></a>
+ to coroutine awaitables.</p></li>
+
+<li><p>Add optional <code>Executor</code> template parameter to all Outcome awaitable types for improved compatibility
+with third party software such as <a href="https://think-async.com/Asio/">ASIO</a>.</p></li>
+
+<li><p>To Experimental.Outcome add <code>clone()</code> for <code>basic_result</code> and <code>basic_outcome</code> types whose <code>EC</code> is
+a <code>status_code</code>. Erased status codes are move-only which makes the Result/Outcome type move-only, but
+they provide a cloning function, so this convenience function both clones the status code and propagates
+the spare storage so stack backtraces etc are also cloned.</p></li>
+
+<li><p>Add type constraints to <code>success()</code> and <code>failure()</code> to disable them if they aren&rsquo;t available.</p></li>
+
+<li><p>Work around a bug in GCC&rsquo;s C++ Coroutines implementation whereby one gets an ICE from <code>gimplify_expr</code>
+in any <code>BOOST_OUTCOME_CO_TRY</code> taking even a mildly complex expression, which obviously is a showstopper.
+The work around assigns the failure type to a stack temporary before <code>co_return</code>-ing that
+temporary. Thanks to RVO pre-17 and copy elision since, this should add no runtime overhead.</p></li>
+</ul>
+
+<h3 id="bug-fixes-5">Bug fixes:</h3>
+
+<dl>
+<dt><a href="https://github.com/ned14/outcome/issues/261">#261</a></dt>
+<dd>Move assignable with move constructible not available did not work with <code>void</code>.</dd>
+</dl>
+
+<hr />
+
+<h2 id="v2-2-3-17th-march-2022-boost-1-79-release-https-github-com-ned14-outcome-releases-tag-v2-2-3">v2.2.3 17th March 2022 (Boost 1.79) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.3">[release]</a></h2>
+
+<h3 id="enhancements-7">Enhancements:</h3>
+
+<dl>
+<dt>Standalone Outcome permanently locks ABI to v2.2.3 release</dt>
+<dd>From this release onwards, you are guaranteed that any code compiled with v2.2.3 Outcome
+or newer will link without issue with any code compiled with a different version of Outcome
+after v2.2.3. As a result, <code>BOOST_OUTCOME_UNSTABLE_VERSION</code> is no longer defined by default, and
+therefore <code>BOOST_OUTCOME_V2_NAMESPACE</code> is now hard coded to <code>outcome_v2</code> rather than a namespace
+which permutes per commit.</dd>
+</dl>
+
+<h3 id="bug-fixes-6">Bug fixes:</h3>
+
+<dl>
+<dt><a href="https://github.com/ned14/outcome/issues/259">#255</a></dt>
+<dd>Fix enabling of move assignable was not calculated correctly.</dd>
+</dl>
+
+<hr />
+
+<h2 id="v2-2-2-8th-december-2021-boost-1-78-release-https-github-com-ned14-outcome-releases-tag-v2-2-2">v2.2.2 8th December 2021 (Boost 1.78) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.2">[release]</a></h2>
+
+<h3 id="enhancements-8">Enhancements:</h3>
+
+<dl>
+<dt><a href="https://github.com/ned14/outcome/issues/255">#255</a></dt>
+<dd>Restore Experimental Outcome constexpr compatibility in C++ 20 which was an undocumented
+property of the Outcome v2.1 series, and which had been dropped in the v2.2 series.</dd>
+<dt>GCC Coroutines support</dt>
+<dd>Coroutine support in GCCs after 10 is now correctly detected.</dd>
+</dl>
+
+<h3 id="bug-fixes-7">Bug fixes:</h3>
+
+<ul>
+<li>None.</li>
+</ul>
+
+<hr />
+
+<h2 id="v2-2-1-13th-august-2021-boost-1-77-release-https-github-com-ned14-outcome-releases-tag-v2-2-1">v2.2.1 13th August 2021 (Boost 1.77) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.1">[release]</a></h2>
+
+<h3 id="bug-fixes-8">Bug fixes:</h3>
+
+<dl>
+<dt><a href="https://github.com/ned14/outcome/issues/251">#251</a></dt>
+<dd><p>Fix failure to compile Boost.Outcome when the compiler declares support for C++ modules.</p></dd>
+<dd><p>Don&rsquo;t use <code>[[likely]]</code> in GCCs before 9.</p></dd>
+<dt><a href="https://github.com/ned14/outcome/issues/253">#251</a></dt>
+<dd><p>Make support for C++ modules opt-in.</p></dd>
+</dl>
+
+<hr />
+
+<h2 id="v2-2-0-16th-april-2021-boost-1-76-release-https-github-com-ned14-outcome-releases-tag-v2-2-0">v2.2.0 16th April 2021 (Boost 1.76) <a href="https://github.com/ned14/outcome/releases/tag/v2.2.0">[release]</a></h2>
+
+<dl>
+<dt>BREAKING CHANGE As announced for a year and three Boost releases, Outcome v2.2 became the default, replacing v2.1.</dt>
+<dd>All v2.1 Outcome code will need to be upgraded as described in <a href="./changelog/upgrade_v21_v22.html">the v2.1 =&gt; v2.2 upgrade guide</a>.
+This branch has a number of major breaking changes to Outcome v2.1, see
+<a href="./changelog/v22.html">the list of v2.2 major changes</a>.</dd>
+</dl>
+
+<h3 id="enhancements-9">Enhancements:</h3>
+
+<dl>
+<dt>VS2019.8 compatibility</dt>
+<dd>VS2019.8 changed how to enable Coroutines, which caused Outcome to not compile on that compiler.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/237">#237</a></dt>
+<dd>If on C++ 20, we now use C++ 20 <code>[[likely]]</code> instead of compiler-specific markup to indicate
+when TRY has likely success or failure.</dd>
+<dt>BREAKING CHANGE <a href="https://github.com/ned14/outcome/issues/247">#247</a></dt>
+<dd><p>Previously the value of <a href="./reference/functions/hooks/spare_storage.html" class="api-reference"><code>spare_storage(const basic_result|basic_outcome *) noexcept</code></a>
+ was
+not propagated over <code>BOOST_OUTCOME_TRY</code>, which causes things like stack backtraces captured at the point of
+construction of an errored result to get dropped at every <code>TRY</code> point. This has been fixed by adding
+an optional <code>spare_storage</code> to <a href="./reference/types/success_type.html" class="api-reference"><code>success_type&lt;T&gt;</code></a>
+ and <a href="./reference/traits/is_failure_type.html" class="api-reference"><code>failure_type&lt;T&gt;</code></a>
+, as well
+as to <a href="./reference/functions/success.html" class="api-reference"><code>auto success(T &amp;&amp;, ...)</code></a>
+ and <a href="./reference/functions/failure.html" class="api-reference"><code>auto failure(T &amp;&amp;, ...)</code></a>
+.</p>
+
+<p>You should not notice this in your code, except that where before spare storage values did not
+propagate through TRY, now they do, which is a breaking change.</p></dd>
+</dl>
+
+<h3 id="bug-fixes-9">Bug fixes:</h3>
+
+<dl>
+<dt>BREAKING CHANGE <a href="https://github.com/ned14/outcome/issues/244">#244</a></dt>
+<dd><p>It came as a shock to learn that <code>BOOST_OUTCOME_TRY</code> had been broken since the inception of this
+library for certain corner case code:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">Foo</span><span class="o">&gt;</span>    <span class="n">get_foo</span><span class="p">();</span>
+<span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">Foo</span><span class="o">&gt;</span>    <span class="n">filter1</span><span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">Foo</span><span class="o">&gt;</span> <span class="o">&amp;&amp;</span><span class="p">);</span>
+<span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">Foo</span><span class="o">&gt;</span> <span class="o">&amp;&amp;</span> <span class="n">filter2</span><span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">Foo</span><span class="o">&gt;</span> <span class="o">&amp;&amp;</span><span class="p">);</span>
+
+<span class="c1">// This works fine, and always has
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_TRY</span><span class="p">(</span><span class="k">auto</span> <span class="n">v</span><span class="p">,</span> <span class="n">filter1</span><span class="p">(</span><span class="n">get_foo</span><span class="p">()))</span>
+
+<span class="c1">// This causes UB due to result&lt;Foo&gt; being destructed before move of value into v
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_TRY</span><span class="p">(</span><span class="k">auto</span> <span class="n">v</span><span class="p">,</span> <span class="n">filter2</span><span class="p">(</span><span class="n">get_foo</span><span class="p">()))</span>
+</code></pre></div>
+<p>Whilst reference passthrough filter functions are not common, they can turn up in highly generic
+code, where destruction before copy/move is not helpful.</p>
+
+<p>The cause is that TRY used to work by binding the result of the expression to an <code>auto &amp;&amp;unique</code>,
+testing if that unique if successful or not, and if successful then moving from <code>unique.value()</code>
+into the user&rsquo;s output variable. If the expression returned is a prvalue, the Result&rsquo;s lifetime is
+extended by the bound reference to outside of the statement, and all is good. If the expression
+returned is an xvalue or lvalue, then the lifetime extension does not exceed that of the statement,
+and the Result is destructed after the semicolon succeeding the assignment to <code>auto &amp;&amp;unique</code>.</p>
+
+<p>This bug has been fixed by TRY deducing the <a href="https://en.cppreference.com/w/cpp/language/value_category">value category</a>
+of its input expression as follows:</p>
+
+<ul>
+<li>prvalues =&gt; <code>auto unique = (expr)</code>   (breaking change)</li>
+<li>xvalue =&gt; <code>auto unique = (expr)</code>     (breaking change)</li>
+<li>lvalue =&gt; <code>auto unique = (expr)</code>     (breaking change)</li>
+</ul>
+
+<p>This ensures that xvalue and lvalue inputs do not cause unhelpfully early lifetime end, though it
+does silently change the behaviour of existing code which relied on rvalues and lvalues being passed
+through, as a new construct-move-destruct or construct-copy-destruct cycle is introduced to where
+there was none before. Also, before C++ 17, there is now an added copy/move for prvalue inputs,
+which does not affect runtime codegen due to Return Value Optimisation (RVO), but does cause
+Results containing non-copying non-moving types to fail to compile, which is a breaking change
+from beforehand.</p>
+
+<p>If one wishes rvalues or lvalues to be passed through, one can avail of a new TRY syntax based on
+preprocessor overloading:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_TRY((refspec, varname), expr)</code></li>
+<li><code>BOOST_OUTCOME_TRYV2(refspec, expr)</code></li>
+</ul>
+
+<p>Here <code>refspec</code> is the storage to be used for <strong>both</strong> the internal temporary unique, AND <code>varname</code>.
+So if you write:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">Foo</span> <span class="o">&amp;&amp;</span><span class="n">foo</span><span class="p">;</span>
+<span class="n">BOOST_OUTCOME_TRY</span><span class="p">((</span><span class="k">auto</span> <span class="o">&amp;&amp;</span><span class="p">,</span> <span class="n">v</span><span class="p">),</span> <span class="n">filter2</span><span class="p">(</span><span class="n">foo</span><span class="p">))</span>
+</code></pre></div>
+<p>&hellip; then the internal unique is declared as <code>auto &amp;&amp;unique = (filter2(foo))</code>, and the output variable
+is declared as <code>auto &amp;&amp;v = std::move(unique).assume_value()</code>. This passes through the rvalue referencing,
+and completely avoids copies and moves of <code>Foo</code>. If you wish to not extract the value but also
+specify unique storage, there is a new <code>BOOST_OUTCOME_TRYV2(refspec, expr)</code>.</p>
+
+<p>My thanks to KamilCuk from <a href="https://stackoverflow.com/questions/66069152/token-detection-within-a-c-preprocessor-macro-argument">https://stackoverflow.com/questions/66069152/token-detection-within-a-c-preprocessor-macro-argument</a>
+for all their help in designing the new overloaded TRY syntax. My thanks also to vasama for reporting this
+issue and working through how best to fix it with me.</p></dd>
+<dt><a href="https://github.com/ned14/outcome/issues/249">#249</a></dt>
+<dd><p>The preprocessor logic for choosing when to use <code>bool</code> with <code>concept</code> on GCC was yet again refactored.
+This should fix those choices of GCC configuration which caused failure due to the wrong combination
+being chosen.</p></dd>
+</dl>
+
+<hr />
+
+<h2 id="v2-1-5-11th-december-2020-boost-1-75-release-https-github-com-ned14-outcome-releases-tag-v2-1-5">v2.1.5 11th December 2020 (Boost 1.75) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.5">[release]</a></h2>
+
+<h3 id="enhancements-10">Enhancements:</h3>
+
+<dl>
+<dt><a href="./tutorial/advanced/hooks.html">The ADL discovered event hooks</a> have been replaced with policy-specified event hooks instead</dt>
+<dd>This is due to brittleness (where hooks would quietly
+self-disable if somebody changed something), compiler bugs (a difference in compiler settings causes
+the wrong hooks, or some but not all hooks, to get discovered), and end user difficulty in using
+them at all. The policy-specified event hooks can be told to default to ADL discovered hooks for
+backwards compatibility: set <a href="./reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ to less than <code>220</code> to
+enable emulation.</dd>
+<dt>Improve configuring <code>BOOST_OUTCOME_GCC6_CONCEPT_BOOL</code></dt>
+<dd>Older GCCs had boolean based concepts syntax, whereas newer GCCs are standards conforming.
+However the precise logic of when to use legacy and conforming syntax was not well understood,
+which caused Outcome to fail to compile depending on what options you pass to GCC. The new logic
+always uses the legacy syntax if on GCC 8 or older, otherwise we use conforming syntax if and
+only if GCC is in C++ 20 mode or later. This hopefully will resolve the corner case build
+failures on GCC.</dd>
+</dl>
+
+<h3 id="bug-fixes-10">Bug fixes:</h3>
+
+<dl>
+<dt>Boost.Outcome should now compile with <code>BOOST_NO_EXCEPTIONS</code> defined</dt>
+<dd>Thanks to Emil, maintainer of Boost.Exception, making a change for me, Boost.Outcome
+should now compile with C++ exceptions globally disabled. You won&rsquo;t be able to use
+<code>boost::exception_ptr</code> as it can&rsquo;t be included if C++ exceptions are globally disabled.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/236">#236</a></dt>
+<dd>In the Coroutine support the <code>final_suspend()</code> was not <code>noexcept</code>, despite being required
+to be so in the C++ 20 standard. This has been fixed, but only if your compiler implements
+<code>noop_coroutine</code>. Additionally, if <code>noop_coroutine</code> is available, we use the much more
+efficient coroutine handle returning variant of <code>await_suspend()</code> which should significantly
+improve codegen and context switching performance.</dd>
+</dl>
+
+<hr />
+
+<h2 id="v2-1-4-14th-august-2020-boost-1-74-release-https-github-com-ned14-outcome-releases-tag-v2-1-4">v2.1.4 14th August 2020 (Boost 1.74) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.4">[release]</a></h2>
+
+<h3 id="enhancements-11">Enhancements:</h3>
+
+<dl>
+<dt>BREAKING CHANGE <code>void</code> results and outcomes no longer default construct types during explicit construction</dt>
+<dd>Previously if you explicitly constructed a <code>result&lt;T&gt;</code> from a non-errored
+<code>result&lt;void&gt;</code>, it default constructed <code>T</code>. This was found to cause unhelpful
+surprise, so it has been disabled.</dd>
+<dt>New macro <code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></dt>
+<dd>The macro <a href="./reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ can be used to
+enable aliasing of older naming and features to newer naming and features when
+using a newer version of Outcome.</dd>
+<dt>Concepts now have snake case style naming instead of camel case style</dt>
+<dd>When Outcome was first implemented, it was thought that C++ 20 concepts were
+going to have camel case style. This was changed before the C++ 20 release, and
+Outcome&rsquo;s concepts have been renamed similarly. This won&rsquo;t break any code in
+Outcome v2.1, as compatibility aliases are provided. However code compiled
+against Outcome v2.2 will need to be upgraded, unless <code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code>
+is set to less than <code>220</code>.</dd>
+<dt>Concepts now live in <code>BOOST_OUTCOME_V2_NAMESPACE::concepts</code> namespace</dt>
+<dd>Previously concepts lived in the <code>convert</code> namespace, now they live in their
+own namespace.</dd>
+<dt>New concepts <a href="./reference/concepts/basic_result.html" class="api-reference"><code>basic_result&lt;T&gt;</code></a>
+ and <a href="./reference/concepts/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T&gt;</code></a>
+ added</dt>
+<dd>End users were finding an unhelpful gap in between <a href="./reference/traits/is_basic_result.html" class="api-reference"><code>is_basic_result&lt;T&gt;</code></a>
+
+and <a href="./reference/concepts/value_or_error.html" class="api-reference"><code>value_or_error&lt;T&gt;</code></a>
+ where they wanted a concept that matched
+types which were <code>basic_result</code>, but not exactly one of those. Concepts filling
+that gap were added.</dd>
+<dt>Operation <code>TRY</code> works differently from Outcome v2.2 onwards</dt>
+<dd>This is a severely code breaking change which change the syntax of how one uses
+<code>BOOST_OUTCOME_TRY()</code>. A regular expression suitable for upgrading code can be found in
+the list of changes between Outcome v2.1 and v2.2.</dd>
+</dl>
+
+<h3 id="bug-fixes-11">Bug fixes:</h3>
+
+<dl>
+<dt><a href="https://github.com/ned14/outcome/issues/224">#224</a></dt>
+<dd>The clang Apple ships in Xcode 11.4 (currently the latest) has not been patched
+with the fixes to LLVM clang that fix <code>noexcept(std::is_constructible&lt;T, void&gt;)</code>
+failing to compile which I originally submitted years ago. So give up waiting on
+Apple to fix their clang, add a workaround to Outcome.</dd>
+<dt>Use of <code>void</code> in <code>T</code> or <code>E</code> caused <code>noexcept(false)</code></dt>
+<dd>Direct traits examination of <code>void</code> was causing nothrow detection to return false,
+fixed.</dd>
+<dt>Spare storage could not be used from within no-value policy classes</dt>
+<dd>Due to an obvious brain fart when writing the code at the time, the spare storage
+APIs had the wrong prototype which prevented them working from within policy classes.
+Sorry.</dd>
+</dl>
+
+<hr />
+
+<h2 id="v2-1-3-29th-april-2020-boost-1-73-release-https-github-com-ned14-outcome-releases-tag-v2-1-3">v2.1.3 29th April 2020 (Boost 1.73) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.3">[release]</a></h2>
+
+<h3 id="enhancements-12">Enhancements:</h3>
+
+<dl>
+<dt>Performance of Outcome-based code compiled by clang has been greatly improved</dt>
+<dd><p>The previous implementation of Outcome&rsquo;s status bitfield confused clang&rsquo;s
+optimiser, which caused low quality codegen. Unlike most codegen issues, this was
+noticeably in empirical benchmarks of real world code, as was shown by
+<a href="https://wg21.link/P1886">P1886 <em>Error speed benchmarking</em></a>.</p>
+
+<p>The safe part of the <a href="https://github.com/ned14/outcome/tree/better_optimisation"><code>better_optimisation</code></a>
+Outcome v2.2.0 future branch was merged to Outcome v2.1.3 which includes a new
+status bitfield implementation. This appears to not confuse clang&rsquo;s optimiser,
+and clang 9 produces code which routinely beats GCC 9&rsquo;s code for various canned
+use cases.</p></dd>
+<dt>Precompiled headers are automatically enabled on new enough cmake&rsquo;s for standalone Outcome</dt>
+<dd><p>If on cmake 3.16 or later, its new precompiled headers build support is used
+to tell consumers of the <code>outcome::hl</code> cmake target to precompile Outcome, <strong>if
+and only if</strong> <code>outcome_IS_DEPENDENCY</code> is false. <code>outcome_IS_DEPENDENCY</code> is set
+by Outcome&rsquo;s CMakeLists.txt if it detects that it was included using
+<code>add_subdirectory()</code>, so for the vast majority of Outcome end users, the use
+of precompiled headers will NOT be enabled.</p>
+
+<p>Exported targets do NOT request precompilation of headers, as it is
+assumed that importers of the Outcome cmake targets will configure their own
+precompiled headers which incorporate Outcome.</p></dd>
+<dt>Installability is now CI tested per commit</dt>
+<dd><p>Due to installability of standalone Outcome (e.g. <code>make install</code>) breaking
+itself rather more frequently than is ideal, installability is now tested on CI
+per commit.</p></dd>
+<dt>Coroutines support has been documented</dt>
+<dd><p>The coroutines support added in v2.1.2 has now been properly documented.</p></dd>
+</dl>
+
+<h3 id="bug-fixes-12">Bug fixes:</h3>
+
+<dl>
+<dt><a href="https://github.com/ned14/outcome/issues/214">#214</a></dt>
+<dd>Newer Concepts implementing compilers were unhappy with the early check for
+destructibility of <code>T</code> and <code>E</code>, so removed template constraints, falling back
+to static assert which runs later in the type instantiation sequence.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/215">#215</a></dt>
+<dd>For standalone Outcome, <code>CMAKE_TOOLCHAIN_FILE</code> is now passed through during
+dependency superbuild. This should solve build issues for some embedded toolchain
+users.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/220">#220</a></dt>
+<dd>A false positive undefined behaviour sanitiser failure in some use cases of
+Experimental Outcome was worked around to avoid the failure message.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/221">#221</a></dt>
+<dd>Restored compatibility with x86 on Windows, which was failing with link errors.
+It was quite surprising that this bug was not reported sooner, but obviously
+almost nobody is using Outcome with x86 on Windows.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/223">#223</a></dt>
+<dd>Fix a segfault in Debug builds only when cloning a <code>status_code_ptr</code> in
+Experimental.Outcome only.</dd>
+</dl>
+
+<hr />
+
+<h2 id="v2-1-2-11th-december-2019-boost-1-72-release-https-github-com-ned14-outcome-releases-tag-v2-1-2">v2.1.2 11th December 2019 (Boost 1.72) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.2">[release]</a></h2>
+
+<h3 id="enhancements-13">Enhancements:</h3>
+
+<dl>
+<dt>Improved compatibility with cmake tooling</dt>
+<dd>Standalone outcome is now <code>make install</code>-able, and cmake <code>find_package()</code> can find it.
+Note that you must separately install and <code>find_package()</code> Outcome&rsquo;s dependency, quickcpplib,
+else <code>find_package()</code> of Outcome will fail.</dd>
+<dt>Non-permissive parsing is now default in Visual Studio</dt>
+<dd>The default targets in standalone Outcome&rsquo;s cmake now enable non-permissive parsing.
+This was required partially because VS2019 16.3&rsquo;s quite buggy Concepts implementation is
+unusuable in permissive parsing mode. Even then, lazy ADL two phase lookup is broken
+in VS2019 16.3 with <code>/std:latest</code>, you may wish to use an earlier language standard.</dd>
+<dt><strong>Breaking change!</strong></dt>
+<dd>The git submodule mechanism used by standalone Outcome of specifying dependent libraries
+has been replaced with a cmake superbuild of dependencies mechanism instead. Upon cmake
+configure, an internal copy of quickcpplib will be git cloned, built and installed into the
+build directory from where an internal <code>find_package()</code> uses it. This breaks the use of
+the unconfigured Outcome repo as an implementation of Outcome, one must now do one of:
+
+<ol>
+<li>Add Outcome as subdirectory to cmake build.</li>
+<li>Use cmake superbuild (i.e. <code>ExternalProject_Add()</code>) to build and install Outcome into
+a local installation.</li>
+<li>Use one of the single header editions.</li>
+</ol></dd>
+<dt><strong>Breaking change!</strong></dt>
+<dd>For standalone Outcome, the current compiler is now checked for whether it will compile
+code containing C++ Concepts, and if it does, all cmake consumers of Outcome will enable
+C++ Concepts. Set the cmake variable <code>BOOST_OUTCOME_C_CONCEPTS_FLAGS</code> to an empty string to prevent
+auto detection and enabling of C++ Concepts support occurring.</dd>
+<dt><code>BOOST_OUTCOME_TRY</code> operation now hints to the compiler that operation will be successful</dt>
+<dd><a href="https://wg21.link/P1886">P1886 <em>Error speed benchmarking</em></a> showed that there is
+considerable gain in very small functions by hinting to the compiler whether the expression
+is expected to be successful or not. <code>BOOST_OUTCOME_TRY</code> previously did not hint to the compiler
+at all, but now it does. A new suite of macros <code>BOOST_OUTCOME_TRY_FAILURE_LIKELY</code> hint to the
+compiler that failure is expected. If you wish to return to the previously unhinted
+behaviour, define <code>BOOST_OUTCOME_TRY_LIKELY(expr)</code> to <code>(!!expr)</code>.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/199">#199</a></dt>
+<dd>Support for C++ Coroutines has been added. This comes in two parts, firstly there is
+now an <code>BOOST_OUTCOME_CO_TRY()</code> operation suitable for performing the <code>TRY</code> operation from
+within a C++ Coroutine. Secondly, in the header <code>outcome/coroutine_support.hpp</code> there are
+implementations of <code>eager&lt;OutcomeType&gt;</code> and <code>lazy&lt;OutcomeType&gt;</code> which let you more
+naturally and efficiently use <code>basic_result</code> or <code>basic_outcome</code> from within C++
+Coroutines &ndash; specifically, if the result or outcome will construct from an exception
+pointer, exceptions thrown in the coroutine return an errored or excepted result with
+the thrown exception instead of throwing the exception through the coroutine machinery
+(which in current compilers, has a high likelihood of blowing up the program). Both
+<code>eager&lt;T&gt;</code> and <code>lazy&lt;T&gt;</code> can accept any <code>T</code> as well. Both have been tested and found
+working on VS2019 and clang 9.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/210">#210</a></dt>
+<dd><code>make_error_code()</code> and <code>make_exception_ptr()</code> are now additionally considered for
+compatible copy and move conversions for <code>basic_result&lt;&gt;</code>. This lets you construct
+a <code>basic_result&lt;T, E&gt;</code> into a <code>basic_result&lt;T, error_code&gt;</code>, where <code>E</code> is a
+custom type which has implemented the ADL discovered free function
+<code>error_code make_error_code(E)</code>, but is otherwise unrelated to <code>error_code</code>.
+The same availability applies for <code>exception_ptr</code> with <code>make_exception_ptr()</code> being
+the ADL discovered free function. <code>basic_outcome&lt;&gt;</code> has less support for this than
+<code>basic_result&lt;&gt;</code> in order to keep constructor count down, but it will accept via
+this mechanism conversions from <code>basic_result&lt;&gt;</code> and <code>failure_type&lt;&gt;</code>.</dd>
+</dl>
+
+<h3 id="bug-fixes-13">Bug fixes:</h3>
+
+<dl>
+<dt><a href="https://github.com/ned14/outcome/issues/207">#184</a></dt>
+<dd>The detection of <code>[[nodiscard]]</code> support in the compiler was very mildly broken.</dd>
+</dl>
+
+<hr />
+
+<h2 id="v2-1-1-19th-august-2019-boost-1-71-release-https-github-com-ned14-outcome-releases-tag-v2-1-1">v2.1.1 19th August 2019 (Boost 1.71) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.1">[release]</a></h2>
+
+<h3 id="enhancements-14">Enhancements:</h3>
+
+<dl>
+<dt><a href="https://github.com/ned14/outcome/issues/184">#184</a></dt>
+<dd>As per request from Boost release managers, relocated <code>version.hpp</code> and
+<code>revision.hpp</code> into detail, and added the Boost licence boilerplate to the top
+of every source file which was missing one (I think). Also took the opportunity
+to run the licence restamping script over all Outcome, so copyright dates are now
+up to date.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/185">#185</a></dt>
+<dd>Add FAQ item explaining issue #185, and why we will do nothing to
+fix it right now.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/189">#189</a></dt>
+<dd>Refactored the <code>BOOST_OUTCOME_TRY</code> implementation to use more clarified
+customisation points capable of accepting very foreign inputs. Removed the
+<code>std::experimental::expected&lt;T, E&gt;</code> specialisations, as those are no longer
+necessary. Fixed the documentation for the customisation points which
+previously claimed that they are ADL discovered, which they are not. Added
+a recipe describing how to add in support for foreign input types.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/183">#183</a></dt>
+<dd>Added a separate <code>motivation/plug_error_code</code> specifically for Boost.</dd>
+</dl>
+
+<h3 id="bug-fixes-14">Bug fixes:</h3>
+
+<dl>
+<dt>-</dt>
+<dd><code>BOOST_OUTCOME_VERSION_MINOR</code> hadn&rsquo;t been updated to 1.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/181">#181</a></dt>
+<dd>Fix issue #181 where Outcome didn&rsquo;t actually implement the strong swap guarantee,
+despite being documented as doing so.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/190">#190</a></dt>
+<dd>Fix issue #190 in Boost edition where unit test suite was not runnable from
+the Boost release distro.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/182">#182</a></dt>
+<dd>Fix issue #182 where <code>trait::is_exception_ptr_available&lt;T&gt;</code> was always true,
+thus causing much weirdness, like not printing diagnostics and trying to feed
+everything to <code>make_exception_ptr()</code>.</dd>
+<dt><a href="https://github.com/ned14/outcome/issues/192">#194</a></dt>
+<dd>Fix issue #192 where the <code>std::basic_outcome_failure_exception_from_error()</code>
+was being defined twice for translation units which combine standalone and
+Boost Outcome&rsquo;s.</dd>
+</dl>
+
+<hr />
+
+<h2 id="v2-1-12th-apr-2019-boost-1-70-release-https-github-com-ned14-outcome-releases-tag-v2-1">v2.1 12th Apr 2019 (Boost 1.70) <a href="https://github.com/ned14/outcome/releases/tag/v2.1">[release]</a></h2>
+
+<ul>
+<li><p><a href="https://github.com/ned14/outcome/issues/180">#180</a></p>
+
+<ul>
+<li><code>success()</code> and <code>failure()</code> now produce types marked <code>[[nodiscard]]</code>.</li>
+</ul></li>
+
+<li><p><code>include/outcome/outcome.natvis</code> is now namespace permuted like the rest of
+Outcome, so debugging Outcome based code in Visual Studio should look much
+prettier than before.</p></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/162">#162</a></p>
+
+<ul>
+<li><code>.has_failure()</code> was returning false at times when it should have returned true.</li>
+</ul></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/152">#152</a></p>
+
+<ul>
+<li>GCC 5 no longer can compile Outcome at all due to <a href="https://stackoverflow.com/questions/45607450/gcc5-nested-variable-template-is-not-a-function-template">https://stackoverflow.com/questions/45607450/gcc5-nested-variable-template-is-not-a-function-template</a>.
+Added explicit version trap for GCC 5 to say it can not work. Note this is not a
+breaking change, GCC 5 was never supported officially in any v2 Outcome.</li>
+</ul></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/150">#150</a></p>
+
+<ul>
+<li><strong>BREAKING CHANGE</strong> <code>result&lt;T, E&gt;</code>, <code>boost_result&lt;T, E&gt;</code> and <code>std_result&lt;T, E&gt;</code>
+no longer implement hard UB on fetching a value from a valueless instance if <code>E</code> is
+a UDT, they now fail to compile with a useful error message. If you wish hard UB,
+use <code>unchecked&lt;T, E&gt;</code>, <code>boost_unchecked&lt;T, E&gt;</code> or <code>std_unchecked&lt;T, E&gt;</code> instead.</li>
+</ul></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/140">#140</a></p>
+
+<ul>
+<li>Fixed a nasty corner case bug where value type&rsquo;s without a copy constructor
+but with a move constructor would indicate via traits that copy construction
+was available. Thanks to Microsoft&rsquo;s compiler team for reporting this issue.</li>
+</ul></li>
+
+<li><p>Added experimental <code>status_result</code> and <code>status_outcome</code> based on experimental
+<code>status_code</code>.</p></li>
+
+<li><p>Boost edition is now 100% Boost, so defaults for <code>result</code> and <code>outcome</code> are
+<code>boost::system::error_code::errc_t</code> and <code>boost::exception_ptr</code>. Moreover,
+the test suite in the Boost edition now exclusively tests the Boost edition.
+One can, of course, freely use the standalone edition with Boost, and the Boost
+edition with <code>std</code> types.</p></li>
+
+<li><p>Renamed ADL discovered customisation point <code>throw_as_system_error_with_payload()</code>
+to <code>outcome_throw_as_system_error_with_payload()</code>.</p></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/135">#135</a></p>
+
+<ul>
+<li>Added much clearer compile failure when user tries <code>result&lt;T, T&gt;</code> or <code>outcome</code>
+where two or more types are identical. Thanks to Andrzej Krzemieński
+for suggesting a technique which combines SFINAE correctness with
+the remaining ability for <code>result&lt;T, T&gt;</code> etc to be a valid type, but
+not constructible.</li>
+</ul></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/67">#67</a></p>
+
+<ul>
+<li>Fixed one of the oldest long open bugs in Outcome, that the noexcept
+unit tests failed on OS X for an unknown reason.</li>
+</ul></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/115">#115</a></p>
+
+<ul>
+<li>Outcome did not construct correctly from <code>failure_type</code>.</li>
+</ul></li>
+
+<li><p>Inexplicably outcome&rsquo;s error + exception constructor had been removed.
+Nobody noticed during the Boost peer review, which is worrying seeing as that
+constructor is needed for one of the main advertised features to Boost!</p></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/107">#107</a> and <a href="https://github.com/ned14/outcome/issues/116">#116</a></p>
+
+<ul>
+<li><code>operator==</code> and <code>operator!=</code> now become disabled if the value, error and
+exception types do not implement the same operator.</li>
+<li>Relatedly, both comparison operators simply didn&rsquo;t work right. Fixed.</li>
+</ul></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/109">#109</a></p>
+
+<ul>
+<li><code>swap()</code> now has correct <code>noexcept</code> calculation and now correctly orders
+the swaps to be whichever is the throwing swap first.</li>
+</ul></li>
+
+<li><p>Added reference dump of v2.1 ABI so we can check if ABI breakage detection
+works in the next set of changes, plus Travis job to check ABI and API compatibility
+per commit.</p></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/124">#124</a></p>
+
+<ul>
+<li><code>BOOST_OUTCOME_TRY</code> is now overloaded and selects <code>void</code> or <code>auto</code> edition
+according to input parameter count.</li>
+</ul></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/120">#120</a></p>
+
+<ul>
+<li>Fix generation of double underscored temporary variables in
+<code>BOOST_OUTCOME_UNIQUE_NAME</code>, which is UB.</li>
+</ul></li>
+
+<li><p><a href="https://github.com/ned14/outcome/issues/110">#110</a></p>
+
+<ul>
+<li>Separated <code>result</code> from its hard coded dependency on the <code>&lt;system_error&gt;</code> header.</li>
+<li>Renamed <code>result</code> and <code>outcome</code> to <code>basic_result</code> and <code>basic_outcome</code>.</li>
+<li>Renamed <code>result.hpp</code> into <code>basic_result.hpp</code>.</li>
+<li>Moved <code>&lt;system_error&gt;</code> and <code>&lt;exception&gt;</code> dependent code into new
+<code>std_result.hpp</code> and <code>std_outcome.hpp</code> header files.</li>
+<li>Added <code>boost_result.hpp</code> and <code>boost_outcome.hpp</code> which use Boost.System
+and Boost.Exception (these are <code>result.hpp</code> and <code>outcome.hpp</code> in the Boost edition).</li>
+</ul></li>
+</ul>
+
+<hr />
+
+<h2 id="v2-0-18th-jan-2018-release-https-github-com-ned14-outcome-releases-tag-v2-0-boost-peer-review">v2.0 18th Jan 2018 <a href="https://github.com/ned14/outcome/releases/tag/v2.0-boost-peer-review">[release]</a></h2>
+
+<ul>
+<li>Boost peer review edition. This is what was reviewed.</li>
+<li>Changelog from v1 can be found in the release notes for this release.</li>
+</ul>
+
+
+
+        </div><p><small>Last revised: August 14, 2024 at 18:00:39 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./videos.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./changelog/upgrade_v21_v22.html"><img src="./images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/changelog/upgrade_v21_v22.html b/doc/html/changelog/upgrade_v21_v22.html
new file mode 100644
index 000000000..a4d20a277
--- /dev/null
+++ b/doc/html/changelog/upgrade_v21_v22.html
@@ -0,0 +1,107 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Upgrade guide v2.1 =&gt; v2.2 - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../changelog.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../changelog.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../changelog/v22.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Upgrade guide v2.1 =&gt; v2.2</h1></div></div></div>
+  <p>In the start of 2020, after a year of listening to user feedback since
+entering Boost, Outcome v2.2 was published with a number of breaking source
+changes from Outcome v2.1 The full year of 2020 (three Boost releases) was given to
+announcing those upcoming changes, and testing the v2.2 branch in
+production. In late December 2020, Outcome v2.2 became the default Outcome,
+and all Outcome v2.1 code shall need to be upgraded to work with v2.2.</p>
+
+<p>To upgrade an Outcome v2.1 based codebase to Outcome v2.2 is very easy:</p>
+
+<ol>
+<li><p>You will need a tool capable of finding regular expressions in all source
+files in a directory tree and replacing them &ndash; most IDEs such as Visual Studio
+have such a tool with GUI, on POSIX a shell script such as this ought to work:</p>
+
+<pre><code>find /path/to/project -type f -name &quot;*.hpp&quot; | xargs sed -i &quot;s/_TRY\(([^(]*?),(.*?)\);/_TRY((auto &amp;&amp;, \1),\2);/g&quot;
+find /path/to/project -type f -name &quot;*.cpp&quot; | xargs sed -i &quot;s/_TRY\(([^(]*?),(.*?)\);/_TRY((auto &amp;&amp;, \1),\2);/g&quot;
+find /path/to/project -type f -name &quot;*.hpp&quot; | xargs sed -i &quot;s/_TRY\(([^(]*?)\);/_TRYV2(auto &amp;&amp;, \1);/g&quot;
+find /path/to/project -type f -name &quot;*.cpp&quot; | xargs sed -i &quot;s/_TRY\(([^(]*?)\);/_TRYV2(auto &amp;&amp;, \1);/g&quot;
+</code></pre>
+
+<p>The transformation needed are the regular expressions <code>_TRY\(([^(]*?),(.*?)\);</code> =&gt;
+<code>_TRY((auto &amp;&amp;, \1),\2);</code> and <code>TRY\(([^(]*?)\);</code> =&gt; <code>_TRYV2(auto &amp;&amp;, \1);</code>.
+This is because in Outcome v2.2 onwards, <code>BOOST_OUTCOME_TRY(var, expr)</code>
+no longer implicitly declares the variable created as <code>auto&amp;&amp;</code> on your behalf,
+now you must specify the storage of the variable. It also declares the internal
+uniquely named temporary as a value rather than as a reference, the initial
+brackets overrides this to force the use of a rvalue reference for the internal
+uniquely named temporary instead.</p>
+
+<p>This makes use of Outcome&rsquo;s <a href="../tutorial/essential/result/try_ref.html">new TRY syntax</a>
+to tell the TRY operation to use references rather than values for the internal
+uniquely named temporary, thus avoiding any copies and moves. The only way to
+override the storage of the internal uniquely named temporary for non-value
+outputting TRY is via the new <code>BOOST_OUTCOME_TRYV2()</code> which takes the storage specifier
+you desire as its first parameter.</p>
+
+<p>The principle advantage of this change is that you can now assign to
+existing variables the successful results of expressions, instead of being
+forced to TRY into a new variable, and move that variable into the destination
+you intended. Also, because you can now specify storage, you can now assign
+the result of a TRYied operation into static or thread local storage.</p></li>
+
+<li><p>The find regex and replace rule above is to preserve exact semantics with
+Outcome v2.1 whereby the internal uniquely named temporary and the variable for
+the value are both rvalue references. If you&rsquo;re feeling like more work, it is
+safer if you convert as many <code>BOOST_OUTCOME_TRY((auto &amp;&amp;, v), expr)</code> to
+<code>BOOST_OUTCOME_TRY(auto &amp;&amp;v, expr)</code> as possible. This will mean that TRY &lsquo;consumes&rsquo;
+<code>expr</code> i.e. moves it into the internal uniquely named temporary, if expr is
+an rvalue reference. Usually this does not affect existing code, but occasionally
+it can, generally a bit of code reordering will fix it.</p></li>
+
+<li><p>If your code uses <a href="../tutorial/advanced/hooks.html">the ADL discovered event hooks</a>
+to intercept when <code>basic_result</code> and <code>basic_outcome</code> is constructed, copies or
+moved, you will need to either define the macro <a href="../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+
+to less than <code>220</code> to enable emulation, or upgrade the code to use the new mechanism.</p>
+
+<p>The hooks themselves have identical signature, <a href="../tutorial/advanced/hooks.html">only the name and location has
+changed</a>. Therefore upgrade is usually
+a case of copy-pasting the hook implementation into a custom <code>NoValuePolicy</code>
+implementation, and changing the ADL free function&rsquo;s name from <code>hook_*</code> to <code>on_*</code>.</p>
+
+<p>You are recommended to upgrade if possible, as the ADL discovered hooks were
+found in real world code usage to be brittle and surprising.</p></li>
+
+<li><p>Any usage of CamelCase named concepts from Outcome must be replaced with snake_case
+named concepts instead:</p>
+
+<ul>
+<li><code>concepts::ValueOrError&lt;T&gt;</code> =&gt; <code>concepts::value_or_error&lt;T&gt;</code></li>
+<li><code>concepts::ValueOrNone&lt;T&gt;</code> =&gt; <code>concepts::value_or_none&lt;T&gt;</code></li>
+</ul>
+
+<p>The CamelCase naming is aliased to the snake_case naming if the macro
+<a href="../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is defined to less than <code>220</code>.
+Nevertheless you ought to upgrade here is possible, as due to a late change
+in C++ 20 all standard concepts are now snake_case named.</p></li>
+
+<li><p>Finally, despite that Outcome does not currently offer a stable ABI guarantee
+(hoped to begin in 2022), v2.1 had a stable storage layout for <code>basic_result</code> and
+<code>basic_outcome</code>. In v2.2 that storage layout has changed, so the ABIs generated by
+use of v2.1 and v2.2 are incompatible i.e. you will need to recompile everything
+using Outcome after you upgrade to v2.2.</p></li>
+</ol>
+
+
+        </div><p><small>Last revised: February 23, 2021 at 17:37:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../changelog.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../changelog.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../changelog/v22.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/changelog/v22.html b/doc/html/changelog/v22.html
new file mode 100644
index 000000000..bb68d37ba
--- /dev/null
+++ b/doc/html/changelog/v22.html
@@ -0,0 +1,83 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>v2.2 major changes - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../changelog/upgrade_v21_v22.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../changelog.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../history.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">v2.2 major changes</h1></div></div></div>
+  <p>Major changes in v2.2 over v2.1 are listed here.</p>
+
+<ol>
+<li><p>A new trait <code>is_move_bitcopying&lt;T&gt;</code> is added, which opts types into a library-based emulation of
+<a href="https://wg21.link/P1029">P1029 <em>move = bitcopies</em></a>. <a href="https://wg21.link/P1028">Experimental <code>std::error</code></a> is opted in by default.
+If this trait is true for your <code>T</code> or <code>E</code> type, Outcome will track moved-from status for your type,
+and will only call your type&rsquo;s destructor if it was not moved from. If your compiler&rsquo;s optimiser is
+sufficiently able to fold code, this improves codegen quality for Experimental Outcome very considerably,
+approaching the same gains as P1029 types would have. Note that the empirical performance difference
+will likely be nil, but the codegen does look much more elegant.</p></li>
+
+<li><p>If for <code>basic_result&lt;T, E&gt;</code> both <code>T</code> and <code>E</code> are trivially copyable, union-based rather than
+struct-based storage will be used. This significantly improves performance in synthetic benchmarks
+which do nothing in deep call stacks of function calls except create and return <code>result&lt;T, E&gt;</code>, and
+makes Outcome return competitive results to alternative error handling choices, improving comparative
+optics. It is not expected that the performance difference will be detectable empirically in real
+world code. It is expected that the build time impact of union storage won&rsquo;t be noticeable, as
+union storage for trivially copyable types is much easier than for non-TC types.</p>
+
+<p>Note that storage remains struct-based if either <code>T</code> or <code>E</code> is neither trivially copyable nor for
+which trait <code>is_move_bitcopying&lt;T&gt;</code> is true. This is because union-based storage for complex
+types has significant build time impact, as anyone who has deployed <code>std::variant</code> or
+<code>std::expected</code> into globally visible public APIs will have noticed.</p></li>
+
+<li><p>The compile time requirement for <code>E</code> types to have a default constructor is removed.</p></li>
+
+<li><p><code>BOOST_OUTCOME_TRY(var, expr)</code> no longer always declares <code>var</code> as <code>auto &amp;&amp;var</code>, but simply uses it
+as is. This allows <code>TRY</code> to initialise or assign. You can use the macro <code>OUTCOME21_TRY</code> if you
+want the pre-Outcome v2.2 behaviour. You may find the regular expression <code>_TRY\(([^(]*?),(.*?)\);</code> =&gt;
+<code>_TRY(auto &amp;&amp;\1,\2);</code> of use to you when upgrading code.</p></li>
+
+<li><p><code>BOOST_OUTCOME_TRY</code> now declares its internal uniquely named temporary variable which holds the result
+of the expression as <code>auto unique = expr</code> instead of <code>auto &amp;&amp;unique = expr</code>. This will cause TRY of
+<code>result&lt;UncopyableAndImmovable&gt;</code> and <code>outcome&lt;UncopyableAndImmovable&gt;</code> to fail to compile, whereas
+previously they did compile. Another big change in semantic is that TRY now will &lsquo;consume&rsquo; values
+moved into it, whereas previously it did not/ The reason for this change was that the previous behaviour
+produced undefined behaviour in various corner use cases, particulary in generic code. You can tell
+TRY to use references instead of values for its uniquely named temporary <a href="../tutorial/essential/result/try_ref.html">using a special
+syntax</a>.</p></li>
+
+<li><p><code>BOOST_OUTCOME_TRY</code> now propagates the value from <a href="../reference/functions/hooks/spare_storage.html" class="api-reference"><code>spare_storage(const basic_result|basic_outcome *) noexcept</code></a>
+
+of the input Result/Outcome into any <a href="../reference/traits/is_failure_type.html" class="api-reference"><code>failure_type&lt;T&gt;</code></a>
+ returned by TRY. Result/Outcome
+now sets its spare storage value from any <a href="../reference/types/success_type.html" class="api-reference"><code>success_type&lt;T&gt;</code></a>
+ or <a href="../reference/traits/is_failure_type.html" class="api-reference"><code>failure_type&lt;T&gt;</code></a>
+
+from which it is constructed. This is a breaking change, as spare storage values were not propagated
+beforehand. However this change means that any stack backtrace identifier captured by a failed
+result construction hook is now fully propagated from failure point up through all TRY operations
+to the code which handles the failure.</p></li>
+
+<li><p><a href="../tutorial/advanced/hooks.html">The ADL discovered event hooks</a> have been replaced
+with policy-specified event hooks instead. This is due to brittleness (where hooks would quietly
+self-disable if somebody changed something), compiler bugs (a difference in compiler settings causes
+the wrong hooks, or some but not all hooks, to get discovered), and end user difficulty in using
+them at all. The policy-specified event hooks can be told to default to ADL discovered hooks for
+backwards compatibility: set <a href="../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ to less than <code>220</code> to
+enable emulation.</p></li>
+</ol>
+
+
+        </div><p><small>Last revised: February 23, 2021 at 17:37:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../changelog/upgrade_v21_v22.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../changelog.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../history.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/credits.html b/doc/html/credits.html
new file mode 100644
index 000000000..917ce0ff8
--- /dev/null
+++ b/doc/html/credits.html
@@ -0,0 +1,228 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Acknowledgements - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./requirements.html"><img src="./images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Acknowledgements</h1></div></div></div>
+  
+
+<h2 id="github-contributors">github contributors</h2>
+
+<style type="text/css">
+.ghContributors{
+display:flex;
+flex-flow:  wrap;
+align-content: flex-start
+}
+
+.ghContributors > div{
+width: 50% ;
+display: inline-flex;
+margin-bottom: 5px;
+}
+.ghContributors > div label{
+padding-left: 4px ;
+}
+.ghContributors > div span{
+font-size: x-small;
+padding-left: 4px ;
+}
+
+</style>
+<div class="ghContributors">
+  
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/230408?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/ned14">@ned14</a></label>
+    <span class="contributions">1518 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/2912717?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/akrzemi1">@akrzemi1</a></label>
+    <span class="contributions">45 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/10555060?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/cstratopoulos">@cstratopoulos</a></label>
+    <span class="contributions">9 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/63265?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/hazelnusse">@hazelnusse</a></label>
+    <span class="contributions">7 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/5796962?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/BurningEnlightenment">@BurningEnlightenment</a></label>
+    <span class="contributions">7 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/47703951?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/libbooze">@libbooze</a></label>
+    <span class="contributions">2 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/10340167?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/johnthagen">@johnthagen</a></label>
+    <span class="contributions">2 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/12157332?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/menuet">@menuet</a></label>
+    <span class="contributions">2 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/8223327?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/amerry">@amerry</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/801922?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/ecatmur">@ecatmur</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/51795?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/gix">@gix</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/6080778?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/norbertwenzel">@norbertwenzel</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/865914?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/vinipsmaker">@vinipsmaker</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/5369819?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/alandefreitas">@alandefreitas</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/5228?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/andoks">@andoks</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/375302?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/catskul">@catskul</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/11360975?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/hyeongyukim">@hyeongyukim</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/5522782?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/jenkins-nedprod">@jenkins-nedprod</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+  <div>
+    <img src="https://avatars.githubusercontent.com/u/1257803?v=4" class="inline" width="32" height="32" style="height: 32px;height: 32px;margin-bottom:.25em; vertical-align:middle; ">
+    <label><a href="https://github.com/sdarwin">@sdarwin</a></label>
+    <span class="contributions">1 commits</span>
+  </div>
+  
+</div>
+
+<h2 id="this-pretty-modern-c-documentation">This pretty, modern C++ documentation</h2>
+
+<ul>
+<li><a href="https://gohugo.io">Hugo</a> - static website generator of this documentation.</li>
+<li><a href="https://github.com/vjeantet/hugo-theme-docdock">hugo-theme-docdock</a> - the Hugo theme used by this documentation.</li>
+<li><a href="https://github.com/foonathan/standardese">Standardese</a> - the API reference generator (up until Outcome v2.0)</li>
+</ul>
+
+<h1 id="special-thanks-for-outcome-v2-1">Special thanks for Outcome v2.1</h1>
+
+<p>Once again Andrzej Krzemienski stands out for a never ceasing flow of excellent questions,
+&ldquo;what if?&rdquo;&rsquo;s, eagle eyed spotting of corner case logic bugs, and design contradictions.
+Thank you Andrzej!</p>
+
+<p>My thanks to the Microsoft Visual C++ compiler team for incorporating Outcome into the
+MSVC test suite, and thus finding many interesting corner case quirks in how best to
+interpret the C++ standard. In some cases, Outcome was refactored to be less ambiguous;
+in others, defects had to be submitted to WG21 because the standard wording was not clear.
+The Visual C++ compiler team were particularly generous with their time in helping track
+down the cause of these issues, complete with submitting pull requests with bug fixes.
+I am very grateful to them.</p>
+
+<h1 id="special-thanks-for-outcome-v2-0">Special thanks for Outcome v2.0</h1>
+
+<p>For a second time, Charley Bay stepped up as review manager. Given how much work it was
+for the v1 review, I can only say <strong>thank you</strong>.</p>
+
+<p>Andrzej Krzemienski went far beyond the call of duty in the development of Outcome v2.
+He wrote the front page, and the start of the tutorial. He thus set the tone, pacing,
+style and form of the tutorial which I merely continued for the rest of the tutorial.
+He also volunteered considerable amounts of his time as as primary peer reviewer for
+the v2 design and implementation, asking many very valuable &ldquo;stupid questions&rdquo; at least
+one of which caused a major rethink and refactor. If Outcome v2 passes its second peer
+review, it&rsquo;s because of Andrzej. Thank you.</p>
+
+<p>Jonathan Müller invested countless hours in his doxygen replacement tool Standardese
+which Outcome uses to generate the reference API docs, and a not insignificant number
+of those went on fixing issues for Outcome. Thank you.</p>
+
+<h1 id="special-thanks-for-outcome-v1">Special thanks for Outcome v1</h1>
+
+<p>To Paul Bristow who <a href="https://lists.boost.org/Archives/boost/2015/05/222687.php">
+proposed the name &ldquo;Outcome&rdquo;</a> for the library after a very extended
+period of name bikeshedding on boost-dev. I had been minded to call the library &ldquo;Boost.Donkey&rdquo;
+just to shut everyone up because the name bike shedding was getting ridiculous. But
+Outcome is a lot nicer, so thank you Paul.</p>
+
+<p>My heartfelt thanks to Charley Bay for acting as review manager for Outcome in May 2017.
+It is becoming ever harder to find a Boost review manager, so thank you! My thanks also
+to the CppCast team Rob Irving and Jason Turner for so quickly getting me on to CppCast
+to discuss <code>expected&lt;T, E&gt;</code> during the Outcome peer review to help publicise the review.</p>
+
+<p>More general thanks are due to those on boost-dev, Reddit and SG14 for extensive and often very detailed
+feedback on the library pretty much from its beginning. You are all too numerous to
+remember, but certainly Tongari and Andrzej Krzemienski come to mind as having engaged
+in particularly long discussion threads with tons of useful feedback which clarified my
+thinking. Andrzej also went through the documentation with a fine toothed comb before the
+review, finding many small errata and confusing wording.</p>
+
+<p>Finally, my thanks to Vicente for driving Expected from its beginnings to hopefully
+standardisation before 2020. It&rsquo;s many years of work getting something standardised, even
+more years than getting a library into Boost which as you can see from the history above
+took about three years.</p>
+
+
+        </div><p><small>Last revised: January 25, 2019 at 23:04:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./history.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./requirements.html"><img src="./images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/css/boost.css b/doc/html/css/boost.css
new file mode 100644
index 000000000..83eb7cd83
--- /dev/null
+++ b/doc/html/css/boost.css
@@ -0,0 +1,1126 @@
+
+/*=============================================================================
+Copyright (c) 2004 Joel de Guzman
+http://spirit.sourceforge.net/
+
+Copyright 2013 Niall Douglas additions for colors and alignment.
+Copyright 2013 Paul A. Bristow additions for more colors and alignments.
+Copyright 2017 Tom Westerhout font fixes to support Sphinx
+
+Distributed under the Boost Software License, Version 1.0. (See accompany-
+ing file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+
+/*=============================================================================
+Body defaults
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+
+    body
+    {
+        margin: 1em;
+        font-size: 16px;
+        font-family: sans-serif;
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+/*=============================================================================
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+
+    p, div.document, div.footer
+    {
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+        font-size: 10pt;
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+    {
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+    pre.synopsis
+    {
+        font-size: 9pt;
+        margin: 1pc 4% 0pc 4%;
+        padding: 0.5pc 0.5pc 0.5pc 0.5pc;
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+    div.highlight,
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+    {
+        font-size: 9pt;
+        display: block;
+        margin: 1pc 4% 0pc 4%;
+        padding: 0.5pc 0.5pc 0.5pc 0.5pc;
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+
+    /* Program listings in tables don't get borders */
+    td .programlisting,
+    td .screen
+    {
+        margin: 0pc 0pc 0pc 0pc;
+        padding: 0pc 0pc 0pc 0pc;
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+
+/*=============================================================================
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+    {
+        text-align: left;
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+        font-weight: bold;
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+
+    h1 { font-size: 140%; }
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+    {
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+    .spirit-nav a
+    {
+        color: white;
+        padding-left: 0.5em;
+    }
+
+    .spirit-nav img
+    {
+        border-width: 0px;
+    }
+
+/*=============================================================================
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+    .copyright-footer
+    {
+        text-align: right;
+        font-size: 70%;
+    }
+
+    .copyright-footer p
+    {
+        text-align: right;
+        font-size: 80%;
+    }
+
+/*=============================================================================
+Table of contents
+=============================================================================*/
+
+    div.toc
+    {
+       margin: 1pc 4% 0pc 4%;
+       padding: 0.1pc 1pc 0.1pc 1pc;
+       font-size: 80%;
+       line-height: 1.15;
+    }
+
+    .boost-toc
+    {
+       float: right;
+       padding: 0.5pc;
+    }
+
+    /* Code on toc */
+    .toc .computeroutput { font-size: 120% }
+
+    /* No margin on nested menus */
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+
+/*=============================================================================
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+    {
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+
+    .informaltable table,
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+    }
+    table.simplelist td
+    {
+        margin: 0em !important;
+        padding: 0em !important;
+        text-align: left !important;
+        font-size: 9pt !important;
+        border: none !important;
+    }
+
+/*=============================================================================
+Suppress margins in tables
+=============================================================================*/
+
+    table th > *:first-child,
+    table td > *:first-child
+    {
+        margin-top: 0;
+    }
+
+    table th > *:last-child,
+    table td > *:last-child
+    {
+        margin-bottom: 0;
+    }
+
+/*=============================================================================
+Blurbs
+=============================================================================*/
+
+    div.note,
+    div.tip,
+    div.important,
+    div.caution,
+    div.warning,
+    div.blurb,
+    p.blurb
+    {
+        font-size: 9pt; /* A little bit smaller than the main text */
+        line-height: 1.2;
+        display: block;
+        margin: 1pc 4% 0pc 4%;
+        padding: 0.5pc 0.5pc 0.5pc 0.5pc;
+    }
+
+    div.blurb img,
+    p.blurb img
+    {
+        padding: 1pt;
+    }
+
+/*=============================================================================
+Variable Lists
+=============================================================================*/
+
+    div.variablelist
+    {
+        margin: 1em 0;
+    }
+
+    /* Make the terms in definition lists bold */
+    div.variablelist dl dt,
+    span.term
+    {
+        font-weight: bold;
+        font-size: 10pt;
+    }
+
+    div.variablelist table tbody tr td
+    {
+        text-align: left;
+        vertical-align: top;
+        padding: 0em 2em 0em 0em;
+        font-size: 10pt;
+        margin: 0em 0em 0.5em 0em;
+        line-height: 1;
+    }
+
+    div.variablelist dl dt
+    {
+        margin-bottom: 0.2em;
+    }
+
+    div.variablelist dl dd
+    {
+        margin: 0em 0em 0.5em 2em;
+        font-size: 10pt;
+    }
+
+    div.variablelist table tbody tr td p,
+    div.variablelist dl dd p
+    {
+        margin: 0em 0em 0.5em 0em;
+        line-height: 1;
+    }
+
+/*=============================================================================
+Misc
+=============================================================================*/
+
+    /* Title of books and articles in bibliographies */
+    span.title
+    {
+        font-style: italic;
+    }
+
+    span.underline
+    {
+        text-decoration: underline;
+    }
+
+    span.strikethrough
+    {
+        text-decoration: line-through;
+    }
+
+    /* Copyright, Legal Notice */
+    div div.legalnotice p
+    {
+        text-align: left
+    }
+
+/*=============================================================================
+Colors
+=============================================================================*/
+
+    @media screen
+    {
+        body {
+            background-color: #FFFFFF;
+            color: #000000;
+        }
+
+    /* Syntax Highlighting */
+        .property,
+        .highlight .k,
+        .highlight .kc,
+        .highlight .kd,
+        .highlight .kn,
+        .highlight .kp,
+        .highlight .kr,
+        .highlight .kt,
+        .keyword { color: #0000AA; }
+
+        .highlight .n,
+        .highlight .na,
+        .highlight .nb,
+        .highlight .bp,
+        .highlight .nc,
+        .highlight .no,
+        .highlight .nd,
+        .highlight .ni,
+        .highlight .ne,
+        .highlight .nf,
+        .highlight .py,
+        .highlight .nl,
+        .highlight .nn,
+        .highlight .nx,
+        .highlight .nt,
+        .highlight .nv,
+        .highlight .vc,
+        .highlight .vg,
+        .highlight .vi,
+        .identifier { color: #000000; }
+
+        .special { color: #707070; }
+
+        .highlight .cp,
+        .preprocessor { color: #402080; }
+
+        .highlight .sc
+        .char { color: teal; }
+
+        .highlight .c,
+        .highlight .ch,
+        .highlight .cm,
+        .highlight .cp,
+        .highlight .cpf,
+        .highlight .c1,
+        .highlight .cs,
+        .highlight .sd,
+        .highlight .sh,
+        .comment { color: #800000; }
+
+        .highlight .s,
+        .highlight .sa,
+        .highlight .sb,
+        .highlight .dl,
+        .highlight .s2,
+        .highlight .se,
+        .highlight .si,
+        .highlight .sx,
+        .highlight .sr,
+        .highlight .s1,
+        .highlight .ss,
+        .string { color: teal; }
+
+        .highlight .m,
+        .highlight .mf,
+        .highlight .mh,
+        .highlight .mi,
+        .highlight .mo,
+        .number { color: teal; }
+
+        .highlight,
+        .white_bkd { background-color: #FFFFFF; }
+
+        .highlight .hll,
+        .dk_grey_bkd { background-color: #999999; }
+
+    /* Links */
+        a, a .keyword, a .identifier, a .special, a .preprocessor
+        a .char, a .comment, a .string, a .number
+        {
+            color: #005a9c;
+        }
+
+        a:visited, a:visited .keyword, a:visited .identifier,
+        a:visited .special, a:visited .preprocessor a:visited .char,
+        a:visited .comment, a:visited .string, a:visited .number
+        {
+            color: #9c5a9c;
+        }
+
+        h1 a, h2 a, h3 a, h4 a, h5 a, h6 a,
+        h1 a:hover, h2 a:hover, h3 a:hover, h4 a:hover, h5 a:hover, h6 a:hover,
+        h1 a:visited, h2 a:visited, h3 a:visited, h4 a:visited, h5 a:visited, h6 a:visited
+        {
+            text-decoration: none; /* no underline */
+            color: #000000;
+        }
+
+    /* Copyright, Legal Notice */
+        .copyright
+        {
+            color: #666666;
+            font-size: small;
+        }
+
+        div div.legalnotice p
+        {
+            color: #666666;
+        }
+
+    /* Program listing */
+        pre.synopsis
+        {
+            border: 1px solid #DCDCDC;
+        }
+
+        div.highlight,
+        .programlisting,
+        .screen
+        {
+            border: 1px solid #DCDCDC;
+        }
+
+        td .programlisting,
+        td .screen
+        {
+            border: 0px solid #DCDCDC;
+        }
+
+    /* Blurbs */
+        div.note,
+        div.tip,
+        div.important,
+        div.caution,
+        div.warning,
+        div.blurb,
+        p.blurb
+        {
+            border: 1px solid #DCDCDC;
+        }
+
+    /* Table of contents */
+        div.toc
+        {
+            border: 1px solid #DCDCDC;
+        }
+
+    /* Tables */
+        div.informaltable table tr td,
+        div.table table tr td
+        {
+            border: 1px solid #DCDCDC;
+        }
+
+        div.informaltable table tr th,
+        div.table table tr th
+        {
+            background-color: #F0F0F0;
+            border: 1px solid #DCDCDC;
+        }
+
+        .copyright-footer
+        {
+            color: #8F8F8F;
+        }
+
+    /* Misc */
+        span.highlight
+        {
+            color: #00A000;
+        }
+    }
+
+    @media print
+    {
+    /* Links */
+        a
+        {
+            color: black;
+        }
+
+        a:visited
+        {
+            color: black;
+        }
+
+        .spirit-nav
+        {
+            display: none;
+        }
+
+    /* Program listing */
+        pre.synopsis
+        {
+            border: 1px solid gray;
+        }
+
+        div.highlight,
+        .programlisting,
+        .screen
+        {
+            border: 1px solid gray;
+        }
+
+        td .programlisting,
+        td .screen
+        {
+            border: 0px solid #DCDCDC;
+        }
+
+    /* Table of contents */
+        div.toc
+        {
+            border: 1px solid gray;
+        }
+
+        .informaltable table,
+        .table table
+        {
+            border: 1px solid gray;
+            border-collapse: collapse;
+        }
+
+    /* Tables */
+        div.informaltable table tr td,
+        div.table table tr td
+        {
+            border: 1px solid gray;
+        }
+
+        div.informaltable table tr th,
+        div.table table tr th
+        {
+            border: 1px solid gray;
+        }
+
+        table.simplelist tr td
+        {
+            border: none !important;
+        }
+
+    /* Misc */
+        span.highlight
+        {
+            font-weight: bold;
+        }
+    }
+
+/*=============================================================================
+Images
+=============================================================================*/
+
+    span.inlinemediaobject img
+    {
+        vertical-align: middle;
+    }
+
+/*==============================================================================
+Super and Subscript: style so that line spacing isn't effected, see
+http://www.adobe.com/cfusion/communityengine/index.cfm?event=showdetails&productId=1&postId=5341
+==============================================================================*/
+
+sup,
+sub {
+height: 0;
+line-height: 1;
+vertical-align: baseline;
+position: relative;
+
+}
+
+/* For internet explorer: */
+
+* html sup,
+* html sub {
+vertical-align: bottom;
+}
+
+sup {
+bottom: 1ex;
+}
+
+sub {
+top: .5ex;
+}
+
+/*==============================================================================
+Indexes: pretty much the same as the TOC.
+==============================================================================*/
+
+    .index
+    {
+       font-size: 80%;
+       padding-top: 0px;
+       padding-bottom: 0px;
+       margin-top: 0px;
+       margin-bottom: 0px;
+       margin-left: 0px;
+    }
+
+    .index ul
+    {
+       padding-left: 3em;
+    }
+
+    .index p
+    {
+       padding: 2px;
+       margin: 2px;
+    }
+
+    .index-entry-level-0
+    {
+        font-weight: bold;
+    }
+
+    .index em
+    {
+        font-weight: bold;
+    }
+
+
+/*==============================================================================
+Alignment and coloring use 'role' feature, available from Quickbook 1.6 up.
+Added from Niall Douglas for role color and alignment.
+http://article.gmane.org/gmane.comp.lib.boost.devel/243318
+*/
+
+/* Add text alignment (see http://www.w3schools.com/cssref/pr_text_text-align.asp) */
+span.aligncenter
+{
+  display: inline-block; width: 100%; text-align: center;
+}
+span.alignright
+{
+  display: inline-block; width: 100%; text-align: right;
+}
+/* alignleft is the default. */
+span.alignleft
+{
+  display: inline-block; width: 100%; text-align: left;
+}
+
+/* alignjustify stretches the word spacing so that each line has equal width
+within a chosen fraction of page width (here arbitrarily 20%).
+*Not* useful inside table items as the column width remains the total string width.
+Nor very useful, except to temporarily restrict the width.
+*/
+span.alignjustify
+{
+  display: inline-block; width: 20%; text-align: justify;
+}
+
+/* Text colors.
+Names at http://www.w3.org/TR/2002/WD-css3-color-20020219/ 4.3. X11 color keywords.
+Quickbook Usage: [role red Some red text]
+
+*/
+span.red { inline-block; color: red; }
+span.green { color: green; }
+span.lime { color: #00FF00; }
+span.blue { color: blue; }
+span.navy { color: navy; }
+span.yellow { color: yellow; }
+span.magenta { color: magenta; }
+span.indigo { color: #4B0082; }
+span.cyan { color: cyan; }
+span.purple { color: purple; }
+span.gold { color: gold; }
+span.silver { color: silver; } /* lighter gray */
+span.gray { color: #808080; } /* light gray */
+
+
+
+
+
+
+/* section-basic.css */
+/*
+  Copyright 2005-2008 Redshift Software, Inc.
+  Distributed under the Boost Software License, Version 1.0.
+  (See accompanying file LICENSE_1_0.txt or https://www.boost.org/LICENSE_1_0.txt)
+*/
+/*@import url(css_0/header.css);*/
+/*
+  Copyright 2005-2008 Redshift Software, Inc.
+  Distributed under the Boost Software License, Version 1.0.
+  (See accompanying file LICENSE_1_0.txt or https://www.boost.org/LICENSE_1_0.txt)
+*/
+/* Heading, title and logo. */
+
+/* Position the common heading. This appears on pages which have their own
+ * markup. Since the body might have a margin this has to be absolutely
+ * positioned. The spacer then pushes the page content down so that it
+ * doesn't fall underneath the heading. */
+#boost-common-heading-doc {
+  position: absolute;
+  left: 0;
+  top: 0;
+}
+body.boost-asciidoctor #boost-common-heading-doc {
+    position: static;
+}
+
+#boost-common-heading-doc-spacer {
+  height: 100px;
+}
+body.boost-asciidoctor #boost-common-heading-doc-spacer {
+  display: none;
+}
+
+#boost-common-heading-doc,
+#heading {
+  margin: 0em;
+  border-bottom: #000000 solid 1px;
+  width: 100%;
+  font-family: sans-serif;
+  font-size: 9.5pt;
+}
+#boost-common-heading-doc .heading-inner,
+#heading .heading-inner {
+  height: 100px;
+  overflow: hidden;
+}
+
+#boost-common-heading-doc *,
+#heading * {
+  font-size: 100%;
+  font-weight: normal;
+  margin: 0;
+  padding: 0;
+  text-decoration: none;
+}
+#boost-common-heading-doc .heading-placard,
+#heading .heading-placard {
+  display: none;
+}
+#boost-common-heading-doc .heading-title .heading-boost,
+#boost-common-heading-doc .heading-title .heading-cpplibraries,
+#heading .heading-title .heading-boost,
+#heading .heading-title .heading-cpplibraries {
+  display: none;
+}
+#boost-common-heading-doc .heading-title,
+#heading .heading-title {
+  float: left;
+}
+#boost-common-heading-doc .heading-title a,
+#heading .heading-title a {
+}
+#boost-common-heading-doc .heading-logo,
+#heading .heading-logo {
+  width: 270px;
+  height: 90px;
+  border: none;
+  vertical-align: bottom;
+  margin: 0px 0px 0px 1.5em;
+}
+#boost-common-heading-doc .heading-quote,
+#heading .heading-quote {
+  text-align: right;
+  padding: 25px 1.5em 10px 0em;
+}
+#boost-common-heading-doc .heading-quote q,
+#heading .heading-quote q {
+  font-size: 90%;
+  display: block;
+}
+#boost-common-heading-doc .heading-quote .heading-attribution,
+#heading .heading-quote .heading-attribution {
+  font-size: 85%;
+  display: block;
+}
+@media (max-device-width: 480px) {
+  .heading-quote {
+    display: none;
+  }
+}
+#boost-common-heading-doc .heading-sections,
+#heading .heading-sections {
+  display: none;
+}
+#boost-common-heading-doc .heading-search,
+#heading .heading-search {
+  display: none;
+  text-align: right;
+  padding: 0em 1.5em 0em 0em;
+}
+#boost-common-heading-doc .heading-search #search-text .q,
+#heading .heading-search #search-text .q {
+  background: transparent;
+  border: none;
+  border-bottom: 1px #BBBBBB solid;
+  margin-right: 0.25em;
+  font-size: 90%;
+}
+#boost-common-heading-doc .heading-search #search-text #q:hover,
+#heading .heading-search #search-text #q:hover {
+  border-bottom: 1px #FFFFFF solid;
+}
+
+.boost-common-header-notice {
+    font-family: sans-serif;
+    font-size: 13px;
+    border: 1px solid #aa5;
+    background: #ffc;
+    color: #000;
+}
+
+a.boost-common-header-inner,
+span.boost-common-header-inner,
+div.boost-common-header-inner {
+    display: block;
+    padding: 10px 13px;
+    text-decoration: none;
+    color: #000;
+}
+
+a.boost-common-header-inner:hover {
+    text-decoration: underline;
+}
+
+@media all and (min-width: 550px) {
+    .boost-common-header-notice {
+        position: absolute;
+        top: 10px;
+        max-width: 400px;
+        max-height: 80px;
+        overflow: hidden;
+        box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.5);
+        margin-left: 300px;
+    }
+}
+
+
+/*@import url(css_0/theme_grape/header.css);*/
+/*
+  Copyright 2005-2006 Redshift Software, Inc.
+  Distributed under the Boost Software License, Version 1.0.
+  (See accompanying file LICENSE_1_0.txt or https://www.boost.org/LICENSE_1_0.txt)
+*/
+
+/* Heading, title and logo. */
+#heading,
+#boost-common-heading-doc {
+  /*background: #574D74 url(/images/header-bg.png) repeat-x top left;*/
+}
+#heading *,
+#boost-common-heading-doc * {
+  color: #FFFFFF;
+}
+#heading .heading-inner,
+#boost-common-heading-doc .heading-inner {
+  /*background: url(/images/header-fg.png) no-repeat top left;*/
+  border: none;
+  border-bottom: #000000 solid 1px;
+}
+#boost-common-heading-doc .heading-logo,
+#heading .heading-logo {
+  width: 236px;
+  height: 55px;
+  margin: 18px 0px 0px 24px;
+}
+
+/* Links in the header. */
+#boost-common-heading-doc .heading-quote a,
+#heading .heading-quote a {
+  border-bottom: 1px solid #BBBBBB;
+}
+#boost-common-heading-doc .heading-quote a:hover,
+#heading .heading-quote a:hover {
+  border-bottom: 1px solid #FFFFFF;
+}
+#boost-common-heading-doc .heading-quote a:visited,
+#heading .heading-quote a:visited {
+  border-bottom: 1px dotted #BBBBBB;
+}
+#boost-common-heading-doc .heading-quote a:visited:hover,
+#heading .heading-quote a:visited:hover {
+  border-bottom: 1px dotted #FFFFFF;
+}
+
+
+pre, div.toc
+{
+    overflow: auto;
+}
+
+div.note table,
+div.tip table,
+div.important table,
+div.caution table,
+div.warning table,
+div.blurb table
+{
+    table-layout: fixed;
+    width: 100%;
+    overflow-wrap: break-word;
+}
+
+span.inlinemediaobject img
+{
+    max-width: 100%;
+}
+
+
+
+
+
+
+/* Overrides to handle differences between BoostBook output and Hugo's.
+*/
+h1 { font-size: 150%; }
+/* Fix that Hugo always puts a <p> into each <li> */
+li p:first-child {
+  display: inline;
+  text-align: inherit;
+  font-size: inherit;
+  line-height: inherit;
+}
+/* Fix that raw dl is not styled */
+dl {
+  text-align: left;
+  font-size: 10pt;
+  line-height: 1.15;
+}
+/* Fix that preformatted outside div.highlight is not styled */
+pre {
+  font-size: 10pt;
+  margin: 1pc 4% 0pc 4%;
+  padding: 0.5pc 0.5pc 0.5pc 0.5pc;
+}
+div.highlight pre {
+  font-size: inherit;
+  margin: initial;
+  padding: initial;
+}
+
+/* We don't use tables for notes like BoostBook */
+div.note,
+div.tip,
+div.important,
+div.caution,
+div.warning,
+div.blurb {
+  position: relative;
+}
+div.notices div.heading {
+  margin-left: 40px;
+  text-transform: capitalize;
+  font-weight: bold;
+  font-size: larger;
+}
+div.notices div.message {
+  margin-left: 40px;
+}
+
+/* Bits ported over from local.css for the DocDock theme.
+This renders the "View on Github" link.
+*/
+div.code-snippet {
+  position: relative;
+}
+div.code-snippet a.code-snippet-url {
+  font-size: 7pt;
+  position: absolute;
+  right: 4%;
+  top: 0.7em;
+  padding-right: 1em;
+}
+/* This renders the tutorial TOC */
+.children p {
+  margin-top: 0px;
+  margin-bottom: 0px;
+  padding-top: 0px;
+  padding-bottom: 0px;
+}
+.children-li p {
+  font-size: small;
+  font-style: italic;
+}
+ol.children li {
+  margin-top: 0.75em;
+}
+ol.children ol {
+  list-style-type: lower-alpha;
+}
+ol.children ol li {
+  margin-top: 0;
+}
+/* This styles captioned figures */
+figure {
+  margin: 1em 40px;
+}
+figure img {
+  border: 0;
+  max-width: 80%;
+  margin: 3rem auto;
+  display: block;
+  text-align: center;
+}
+figure figcaption {
+  margin-top: -2em;
+}
+figure figcaption h4 {
+  text-align: center;
+  font-size: small;
+}
diff --git a/doc/html/css/local.css b/doc/html/css/local.css
new file mode 100644
index 000000000..b40ca553b
--- /dev/null
+++ b/doc/html/css/local.css
@@ -0,0 +1,169 @@
+body {
+  text-align: justify;
+}
+h2, h3, h4, h5, h6 {
+  text-align: left;
+}
+article section.page h1:first-of-type {
+  font-weight: 900;
+  text-transform: inherit;
+  line-height: 3.25rem;
+}
+article > aside .menu {
+  text-align: left;
+}
+article > aside .menu code {
+  border-left: 0.25em solid transparent;
+  border-right: 0.25em solid transparent;
+}
+h1 {
+  font-weight: inherit;
+  line-height: 3.25rem;
+}
+h2 {
+  text-transform: none;
+  font-weight: inherit;
+  line-height: 2.55rem;
+}
+h4 {
+  line-height: 1.9rem;
+  font-size: small;
+}
+dd {
+  margin-inline-start: 40px;
+}
+blockquote {
+  border-left: 4px solid #ccc;
+  background: #f9f9f9;
+  font-style: italic;
+  padding-left: 4em;
+  padding-right: 4em;
+  quotes: "\201C""\201D""\2018""\2019";
+}
+figure figcaption {
+  margin-top: -2em;
+}
+figure figcaption h4 {
+  text-align: center;
+}
+code, pre {
+  text-align: left;
+}
+a code {
+  color: inherit;
+}
+a.api-reference {
+  font-family: monospace;
+}
+div.footnotes {
+  font-size: 85%;
+}
+article section.page pre .copy-to-clipboard {
+  background-color: #eee;
+}
+div.code-snippet {
+  position: relative;
+}
+div.code-snippet a.code-snippet-url {
+  font-size: small;
+  position: absolute;
+  right: 3em;
+  top: 0.7em;
+}
+
+/*nav#TableOfContents {
+  width: 30em;
+  float: right;
+  text-align: left;
+  font-size: inherit !important;
+}
+nav#TableOfContents > ul {
+  list-style: none;
+}
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diff --git a/doc/html/experimental.html b/doc/html/experimental.html
new file mode 100644
index 000000000..02c62c85a
--- /dev/null
+++ b/doc/html/experimental.html
@@ -0,0 +1,112 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Experimental - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="./recipes/foreign-try.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">Experimental</h1></div></div></div>
+<p>In <code>&lt;boost/outcome/experimental&gt;</code>, there ships an Outcome-based simulation of
+the proposed <a href="https://wg21.link/P1095">P1095 <em>Zero overhead deterministic failure</em></a>
+specific implementation of <a href="http://wg21.link/P0709">P0709 <em>Zero overhead exceptions: Throwing values</em></a>.
+This library-only implementation lets you use a close simulacrum
+of potential future C++ lightweight exceptions today in <a href="./requirements.html">any C++ 14 compiler
+which Outcome supports</a>.</p>
+
+<p>This Experimental Outcome implementation has been in production use for some
+years now. It has shipped on at least one billion devices, as part of a
+games suite very popular on Microsoft Windows, Apple iOS and Google Android
+devices. It powers big iron enterprise applications as well, indeed all
+trades including futures in the United States are captured live into a database
+for the SEC by an Experimental Outcome based codebase. Finally, Experimental
+Outcome is used in the firmware of parts of driver assisting cars where its
+particularly rich and flexible failure added information combined with
+compatibility with globally disabled C++ exceptions proved to be a big win.</p>
+
+<p>The base for failure handling in future C++ might be <code>std::error</code> from <a href="https://wg21.link/P1028">P1028
+<code>status_code</code></a>. This proposal is currently being
+refined before WG21&rsquo;s Library Evolution Working Group with the expectation that
+it will be standardised as a large enhancement and backwards compatible superset
+of <code>std::error_code</code> which is also capable of transporting any move-only type
+such as <code>std::exception_ptr</code>. Like <code>std::error_code</code>, proposed <code>std::error</code>
+occupies exactly two CPU registers of layout, and thus is extremely lightweight.
+It can wrap arbitrary third party error handling systems, and automatically
+constructs from <code>std::error_code</code> and <code>std::exception_ptr</code>, propagating the
+original underlying implementations (no matter how customised) exactly (e.g.
+<code>boost::exception_ptr</code>). Unlike <code>&lt;system_error&gt;</code>, <code>std::error</code> does not have
+dependencies on expensive standard library headers, so including it into your
+global build has a very low build time impact. <code>std::error</code> knows how to throw
+itself as a conventional C++ exception, and knows how to losslessly consume
+arbitrary C++ exception throws. Finally, <code>std::error</code> is ABI stable, and is
+a <a href="https://wg21.link/P1029">P1029 move bitcopying</a> type whereby moved-from
+objects do not need to be destroyed.</p>
+
+<hr />
+
+<p>Experimental Outcome uses the <a href="https://wg21.link/P1028">same proposed <code>std::error</code> object as P1095 would do
+for its <code>E</code> type</a> by bundling internally a copy of
+<a href="https://ned14.github.io/status-code/">https://ned14.github.io/status-code/</a>, the reference implementation library
+for proposed <code>std::error</code>. Outcome emulates move bitcopying semantics for types
+declaring themselves move bitcopying via the trait <a href="./reference/traits/is_move_bitcopying.html" class="api-reference"><code>is_move_bitcopying&lt;T&gt;</code></a>
+,
+and status codes opt into this. This greatly improves codegen to be no worse
+than with <code>std::error_code</code> (a trivially copyable type), as <a href="https://godbolt.org/z/GEdEGc">https://godbolt.org/z/GEdEGc</a>
+demonstrates, despite that proposed <code>std::error</code> is a move-only type with
+a non-trivial destructor.</p>
+
+<p>Outcome binds <code>status_code</code> into <code>basic_result</code> and <code>basic_outcome</code> customisations
+via the following headers:</p>
+
+<ul>
+<li><code>&lt;boost/outcome/experimental/status_result.hpp&gt;</code></li>
+<li><code>&lt;boost/outcome/experimental/status_outcome.hpp&gt;</code></li>
+</ul>
+
+<p>These headers import the entire contents of the <code>BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE</code>
+namespace into the <code>BOOST_OUTCOME_V2_NAMESPACE::experimental</code> namespace. You
+can thus address everything in <code>BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE</code> via
+<code>BOOST_OUTCOME_V2_NAMESPACE::experimental</code>.</p>
+
+<p>As P1095 also proposes C language support for lightweight C++ exceptions,
+experimental Outcome also has a macro-based C interface that enables C
+code to work with the C-compatible subset of <code>status_result&lt;T, E&gt;</code>:</p>
+
+<ul>
+<li><code>&lt;boost/outcome/experimental/result.h&gt;</code></li>
+</ul>
+
+<p>For non-Windows non-POSIX platforms such as some embedded systems, standalone
+Experimental Outcome can be used with the <code>BOOST_OUTCOME_SYSTEM_ERROR2_NOT_POSIX</code> macro
+defined. This does not include POSIX headers, and makes available a high fidelity,
+fully deterministic, alternative to C++ exceptions on such platforms.</p>
+
+<p>Finally, there is a single include edition of Experimental Outcome, which
+can be found at <a href="https://github.com/ned14/outcome/blob/develop/single-header/outcome-experimental.hpp">https://github.com/ned14/outcome/blob/develop/single-header/outcome-experimental.hpp</a>.
+You can play with this on godbolt by <code>#include &lt;outcome-experimental.hpp&gt;</code>.</p>
+
+<div class="notices warning" style="background: url('images/warning.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">warning</div>
+<div class="notices message"><p><b>It is stressed, in the strongest possible terms, that any item inside
+<code>&lt;boost/outcome/experimental&gt;</code> is subject to unannounced breaking change based
+on WG21 standards committee feedback</b>. That said, the chances are high
+that most of those breaking changes will be to naming rather than to
+fundamental semantics, so you can upgrade with a bit of find and replace.</p>
+</div>
+</div>
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./recipes/foreign-try.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/experimental/advantages.html b/doc/html/experimental/advantages.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/experimental/advantages.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>The main advantages - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../experimental.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../experimental/map.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">The main advantages</h1></div></div></div>
+  <p>The main advantages of choosing <code>&lt;boost/outcome/experimental&gt;</code> over default Outcome:</p>
+
+<ol>
+<li><p>Codegen is tighter and less verbose<sup class="footnote-ref" id="fnref:1"><a href="#fn:1">1</a></sup>, sometimes remarkably so.</p></li>
+
+<li><p>Build time impact is markedly lower, barely above the inclusion of naked
+<code>&lt;basic_result.hpp&gt;</code>, as the STL allocator machinery and <code>std::string</code> et al
+is not dragged into inclusion by including <code>&lt;system_error&gt;</code>. Note that
+<code>&lt;boost/outcome/experimental/status_outcome.hpp&gt;</code> bring in <code>&lt;exception&gt;</code>,
+however <code>&lt;boost/outcome/experimental/status_result.hpp&gt;</code> brings in no extra system
+headers.</p></li>
+
+<li><p>More discipline is imposed on your use of Outcome, leading to
+less ambiguous code which is easier to optimise by the compiler,
+lower cost to maintain, and lower cognitive load to audit code based on
+experimental Outcome for correctness.</p></li>
+
+<li><p>Code written to <code>&lt;boost/outcome/experimental&gt;</code> can be fairly easily dual
+targeted, with just a few switching type aliases, to default Outcome.
+This author has several Outcome-based libraries with identical source code which
+can target either configuration of Outcome. The experimental Outcome
+build regularly beats the default Outcome build in benchmarks by 2-3%,
+and the dual target source code, being written to tighter discipline,
+is faster and more deterministic in the default target than it was before
+the (non-trivial) port to <code>&lt;boost/outcome/experimental&gt;</code>.</p></li>
+
+<li><p>If you want &lsquo;official&rsquo; C support, experimental Outcome is able to
+provide that in a way not possible for default Outcome which cannot make
+sufficiently strong C compatibility assumptions about <code>std::error_code</code>.</p></li>
+</ol>
+
+<p>If you are building a codebase on top of Outcome expecting long term
+maintenance, the author&rsquo;s personal recommendation is that you design, write, test and
+optimise it for <code>&lt;boost/outcome/experimental&gt;</code>. What you ship to your customers
+ought to be targeted at default Outcome however, so employ type aliases and
+macros as appropriate to switch the build configuration for production releases.
+This is what the Outcome author does himself, to date with great success,
+despite the fundamental architectural differences between <code>&lt;system_error&gt;</code>
+and proposed <code>&lt;system_error2&gt;</code>.</p>
+<div class="footnotes">
+
+<hr />
+
+<ol>
+<li id="fn:1">Boost.System&rsquo;s <code>error_code</code> has incorporated some of the design improvements of experimental <code>status_code</code>, and produces codegen somewhere in between experimental <code>status_code</code> and <code>std::error_code</code>.
+ <a class="footnote-return" href="#fnref:1"><sup>[return]</sup></a></li>
+</ol>
+</div>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../experimental.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/experimental/c-api.html b/doc/html/experimental/c-api.html
new file mode 100644
index 000000000..2a999e0bd
--- /dev/null
+++ b/doc/html/experimental/c-api.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Using Outcome from C code - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../experimental/worked-example-long/implicit_conversion.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../experimental/c-api/from-cxx.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Using Outcome from C code</h1></div></div></div>
+<p>A long standing problem for C code (or more usually nowadays, the many other programming
+languages which can speak the C ABI but not the C++ ABI) is how to interpret C++ exception throws. The answer
+is of course that they cannot, thus requiring one to write C shim code on the C++ side
+of things of the form:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// The API we wish to expose to C
+</span><span class="c1"></span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="nf">get_value</span><span class="p">(</span><span class="kt">double</span> <span class="n">v</span><span class="p">);</span>
+
+<span class="c1">// The C shim function for the C++ get_value() function.
+</span><span class="c1"></span><span class="k">extern</span> <span class="s">&#34;C&#34;</span> <span class="kt">int</span> <span class="n">c_get_value</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">**</span><span class="n">ret</span><span class="p">,</span> <span class="kt">double</span> <span class="n">v</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">try</span>
+  <span class="p">{</span>
+    <span class="o">*</span><span class="n">ret</span> <span class="o">=</span> <span class="n">get_value</span><span class="p">(</span><span class="n">v</span><span class="p">);</span>
+    <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>  <span class="c1">// success
+</span><span class="c1"></span>  <span class="p">}</span>
+  <span class="k">catch</span><span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">range_error</span> <span class="o">&amp;</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="k">return</span> <span class="n">ERANGE</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="c1">// More catch clauses may go in here ...
+</span><span class="c1"></span>  <span class="k">catch</span><span class="p">(...)</span>
+  <span class="p">{</span>
+    <span class="k">return</span> <span class="n">EAGAIN</span><span class="p">;</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+</code></pre></div>
+<p>This is sufficiently painful that most reach for a bindings generator tool like
+<a href="http://www.swig.org/">SWIG</a> to automate this sort of tedious boilerplate generation.
+And this is fine for larger projects, but for smaller projects the cost of
+setting up and configuring SWIG is also non-trivial.</p>
+
+<p>What would be really great is if <code>result&lt;T&gt;</code> returning <code>noexcept</code> C++ functions
+could be used straight from C. And indeed Experimental Outcome provides just that facility
+which this section covers next.</p>
+
+
+
+        </div><p><small>Last revised: February 05, 2019 at 17:14:18 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../experimental/worked-example-long/implicit_conversion.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/experimental/c-api/from-c.html b/doc/html/experimental/c-api/from-c.html
new file mode 100644
index 000000000..cd9bc2f29
--- /dev/null
+++ b/doc/html/experimental/c-api/from-c.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>C Results - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../experimental/c-api/from-cxx/example2.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/c-api.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/c-api/from-c/system_code.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">C Results</h1></div></div></div>
+<p>The C macro API header <code>&lt;boost/outcome/experimental/result.h&gt;</code> has some macros for working with any kind of Result:</p>
+
+<dl>
+<dt><code>BOOST_OUTCOME_C_DECLARE_RESULT(ident, T, E)</code>
+<dd>Declares to C a <code>basic_result<T, E></code> type uniquely
+identified by <code>ident</code>. <code>T</code> is available at the
+member variable <code>.value</code>, and <code>E</code> is available
+at the member variable <code>.error</code>. If you call this from within
+C++, make SURE it is not within a <code>extern "C"</code> block!
+
+<dt><code>BOOST_OUTCOME_C_RESULT(ident)</code>
+<dd>A reference to a previously declared <code>result</code> type with
+unique <code>ident</code>.
+
+<dt><code>BOOST_OUTCOME_C_RESULT_HAS_VALUE(r)</code>
+<dd>Evaluates to 1 (true) if the input <code>result</code> has a value.
+
+<dt><code>BOOST_OUTCOME_C_RESULT_HAS_ERROR(r)</code>
+<dd>Evaluates to 1 (true) if the input <code>result</code> has an error.
+
+<dt><code>BOOST_OUTCOME_C_RESULT_ERROR_IS_ERRNO(r)</code>
+<dd>Evaluates to 1 (true) if the input <code>result</code>'s error value
+is a code in the POSIX <code>errno</code> domain.
+</dl>
+
+<p>The above let you work, somewhat awkwardly, with any C-compatible
+<code>basic_result&lt;T, E&gt;</code>. <code>basic_result&lt;T, E&gt;</code> is trivially copyable and
+standard layout if its <code>T</code> and <code>E</code> are both so, and it has the C layout:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">struct</span> <span class="n">cxx_result_</span><span class="cp">##ident
+</span><span class="cp"></span><span class="p">{</span>
+  <span class="k">union</span>
+  <span class="p">{</span>
+    <span class="n">T</span> <span class="n">value</span><span class="p">;</span>
+    <span class="n">E</span> <span class="n">error</span><span class="p">;</span>
+  <span class="p">};</span>
+  <span class="kt">unsigned</span> <span class="n">flags</span><span class="p">;</span>
+<span class="p">};</span>
+</code></pre></div>
+<p>Note that this layout is different to that of <a href="../../experimental/c-api/from-c.html"><code>BOOST_OUTCOME_C_DECLARE_STATUS_CODE</code></a>
+as the C++ <code>result</code> has a different layout if <code>E</code> is a status code.</p>
+
+
+
+        </div><p><small>Last revised: July 17, 2024 at 17:54:05 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../experimental/c-api/from-cxx/example2.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/c-api.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/c-api/from-c/system_code.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/c-api/from-c/declare.html b/doc/html/experimental/c-api/from-c/declare.html
new file mode 100644
index 000000000..896be573a
--- /dev/null
+++ b/doc/html/experimental/c-api/from-c/declare.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Declare a Result - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-c/system_code.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-c.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../experimental/c-api/from-c/use.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Declare a Result</h1></div></div></div>
+  <div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// Declare to C a Result with a happy value of intptr_t
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_C_DECLARE_RESULT_SYSTEM</span><span class="p">(</span><span class="n">result_int</span><span class="p">,</span> <span class="n">intptr_t</span><span class="p">)</span>
+
+<span class="c1">// Save oneself typing out BOOST_OUTCOME_C_RESULT_SYSTEM(result_int) all the time
+</span><span class="c1"></span><span class="k">typedef</span> <span class="n">BOOST_OUTCOME_C_RESULT_SYSTEM</span><span class="p">(</span><span class="n">result_int</span><span class="p">)</span> <span class="n">result</span><span class="p">;</span>
+
+<span class="c1">// Our custom C enum
+</span><span class="c1"></span><span class="k">enum</span> <span class="n">c_enum</span>
+<span class="p">{</span>
+  <span class="n">c_enum_not_found</span><span class="p">,</span>
+  <span class="n">c_enum_bad_argument</span>
+<span class="p">};</span>
+
+<span class="c1">// Make a custom status code domain for this C enum
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_C_DECLARE_RESULT_SYSTEM_FROM_ENUM</span><span class="p">(</span><span class="n">result_int</span><span class="p">,</span>                                <span class="c1">// The C Result type declared above
+</span><span class="c1"></span>                                    <span class="n">c_enum</span><span class="p">,</span>                                    <span class="c1">// The C enum we wish to wrap
+</span><span class="c1"></span>                                    <span class="s">&#34;{74ceb994-7622-3a21-07f0-b016aa705585}&#34;</span><span class="p">,</span>  <span class="c1">// Unique UUID for this domain
+</span><span class="c1"></span>                                    <span class="c1">// Mappings of C enum values to textual description and semantic equivalances to generic codes
+</span><span class="c1"></span>                                    <span class="p">{</span><span class="n">c_enum</span><span class="o">::</span><span class="n">c_enum_not_found</span><span class="p">,</span> <span class="s">&#34;item not found&#34;</span><span class="p">,</span> <span class="p">{</span><span class="n">errc</span><span class="o">::</span><span class="n">no_such_file_or_directory</span><span class="p">}},</span>
+                                    <span class="p">{</span><span class="n">c_enum</span><span class="o">::</span><span class="n">c_enum_bad_argument</span><span class="p">,</span> <span class="s">&#34;invoked wrong&#34;</span><span class="p">,</span> <span class="p">{</span><span class="n">errc</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">}})</span>
+
+<span class="c1">// Make helper macros
+</span><span class="c1"></span><span class="cp">#define SUCCESS(v) BOOST_OUTCOME_C_MAKE_RESULT_SYSTEM_SUCCESS(result_int, (v))
+</span><span class="cp">#define FAILURE(v) BOOST_OUTCOME_C_MAKE_RESULT_SYSTEM_FROM_ENUM(result_int, c_enum, (v))
+</span><span class="cp"></span></code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/c_api2.cpp#L39" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The key to making C programming easy is to alias the long complex things
+into short easy thing. Obviously <code>SUCCESS(expr)</code> and <code>FAILURE(expr)</code> is too
+generic, but for the purposes of this documentation it makes thing easier.</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-c/system_code.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-c.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../experimental/c-api/from-c/use.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/c-api/from-c/system_code.html b/doc/html/experimental/c-api/from-c/system_code.html
new file mode 100644
index 000000000..c051742cd
--- /dev/null
+++ b/doc/html/experimental/c-api/from-c/system_code.html
@@ -0,0 +1,117 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>C system error results - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-c.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-c.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../experimental/c-api/from-c/declare.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">C system error results</h1></div></div></div>
+  <p>In v2.2.11, C Result support went from second tier to first tier status, and
+now you can create, query and manipulate a subset of Result types entirely from
+within C by including <code>&lt;boost/outcome/experimental/result.h&gt;</code>.</p>
+
+<p>The subset supported are those <code>result&lt;T, E&gt;</code> which are <a href="../../../experimental/status_result.html">a <code>status_result&lt;T&gt;</code></a>
+i.e. the <code>E</code> is hardcoded to <code>experimental::error</code> which is the type erased runtime
+polymorphic holder for any errored <code>status_code</code> whose payload is not bigger
+than an <code>intptr_t</code>. This is the most useful subset of Outcome Experimental&rsquo;s
+possible Result types, allowing arbitrary custom error coding schemes from
+any unknown source to work seamlessly with all others, including errors from
+the system or third party libraries.</p>
+
+<p>The operations available to C are:</p>
+
+<dl>
+<dt><code>BOOST_OUTCOME_C_DECLARE_RESULT_SYSTEM(ident, T)</code>
+<dd>Declares to C a <code>status_result<T></code> type uniquely
+identified by <code>ident</code>. <code>T</code> is available at the
+member variable <code>.value</code>, and <code>struct cxx_status_code_system</code>
+is available at the member variable <code>.error</code>. If in C++,
+implements C extern functions for making successful and failure results
+of this type. If you call this from within
+C++, make SURE it is not within a <code>extern "C"</code> block!
+
+<dt><code>BOOST_OUTCOME_C_RESULT_SYSTEM(ident)</code>
+<dd>A reference to a previously declared <code>status_result</code> type with
+unique <code>ident</code>.
+
+<dt><code>BOOST_OUTCOME_C_MAKE_RESULT_SYSTEM_SUCCESS(ident, expr)</code> (needs C++ counterpart linked into final binary)
+<dd>This invokes the aforementioned extern function which creates a <code>status_result</code>
+with a successful value of type <code>T</code>.
+<dt><code>BOOST_OUTCOME_C_MAKE_RESULT_SYSTEM_FAILURE_POSIX(ident, expr)</code> (needs C++ counterpart linked into final binary)
+<dd>This invokes the aforementioned extern function which creates a <code>status_result</code>
+with a failure of type <code>posix_code</code> representing a POSIX <code>errno</code>.
+<dt><code>BOOST_OUTCOME_C_MAKE_RESULT_SYSTEM_FAILURE_SYSTEM(ident, expr)</code> (needs C++ counterpart linked into final binary)
+<dd>This invokes the aforementioned extern function which creates a <code>status_result</code>
+with a failure of type <code>posix_code</code> representing a POSIX <code>errno</code>
+if on POSIX; if on Windows then a failure of type <code>win32_code</code>
+representing a Win32 error code from a Windows API.
+
+<br><br>
+<dt><code>BOOST_OUTCOME_C_RESULT_HAS_VALUE(r)</code>
+<dd>Evaluates to 1 (true) if the input <code>result</code> has a value.
+
+<dt><code>BOOST_OUTCOME_C_RESULT_HAS_ERROR(r)</code>
+<dd>Evaluates to 1 (true) if the input <code>result</code> has an error.
+
+<dt><code>BOOST_OUTCOME_C_RESULT_ERROR_IS_ERRNO(r)</code>
+<dd>Evaluates to 1 (true) if the input <code>result</code>'s error value
+is a code in the POSIX <code>errno</code> domain.
+<br><br>
+<dt><code>BOOST_OUTCOME_C_RESULT_SYSTEM_TRY(expr)</code>
+<dd>If the <code>status_result</code> returned by <code>expr</code> is
+errored, exit the current function returning the result. This obviously
+requires that the return type of the current function matches that of <code>
+expr</code>.
+
+<dt><code>BOOST_OUTCOME_C_RESULT_SYSTEM_TRY(cleanup, expr)</code>
+<dd>Same as the above, but execute <code>cleanup</code> just before exiting the function
+if returning failure.
+
+<dt><code>BOOST_OUTCOME_C_RESULT_SYSTEM_TRY(var, cleanup, expr)</code>
+<dd>Same as the above, but set <code>var</code> equal to the result's <code>.value</code> on success.
+
+<dt><code>BOOST_OUTCOME_C_RESULT_SYSTEM_TRY(var, ident, cleanup, expr)</code>
+<dd>Same as the above, but use <code>ident</code> as the return type instead. This allows
+the return type of the calling function to differ from that of <code>expr</code>.
+<br><br>
+<dt><code>BOOST_OUTCOME_C_DECLARE_RESULT_SYSTEM_FROM_ENUM(ident, enum_name, uuid, {enum mapping-sequence, ...})</code>
+<dd>This declares to C an extern function which creates a <code>status_result</code>
+from a C enum. If in C++, it implements a <code>quick_status_code_from_enum</code> for
+the C enum and the associated extern function, and you will need to supply <code>uuid</code>
+and the appropriate enum value mapping sequence <a href="../../../experimental/worked-example.html">
+as per the <code>quick_status_code_from_enum</code> documentation</a>.
+<dt><code>BOOST_OUTCOME_C_MAKE_RESULT_SYSTEM_FROM_ENUM(ident, enum_name, expr)</code> (needs C++ counterpart linked into final binary)
+<dd>This invokes the aforementioned extern function which creates a <code>status_result</code>
+from a C enum.
+</dl>
+
+<p>The operations available to C++ are:</p>
+
+<dl>
+<dt><code>BOOST_OUTCOME_C_TO_RESULT_SYSTEM_CODE(ident, status_code&lt;T&gt;)</code>
+<dd>Returns a previously declared C Result from its matching C++ <code>status_code</code>.
+NOTE that the destructor of the C++ status code is NOT called. If this is important
+to your status code, it is 100% on you to ensure that your C Result reenters a C++
+Result at the end of its lifetime.
+
+<dt><code>to_result(any C Result)</code>
+<dd>This is an overloaded C++ free function which returns the C++ status_code&lt;T&gt;
+matching its input C Result.
+</dl>
+
+<p>Using the above you can write C code using Outcome.Experimental&rsquo;s Result type
+quite effectively. Let&rsquo;s look at an example of use next.</p>
+
+
+        </div><p><small>Last revised: July 17, 2024 at 17:54:05 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-c.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-c.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../experimental/c-api/from-c/declare.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/c-api/from-c/try.html b/doc/html/experimental/c-api/from-c/try.html
new file mode 100644
index 000000000..13a9092c2
--- /dev/null
+++ b/doc/html/experimental/c-api/from-c/try.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>TRY a C Result - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-c/use.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-c.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">TRY a C Result</h1></div></div></div>
+  <p>Thanks to much of the magic of <a href="../../../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+ being implemented
+using C preprocessor metaprogramming, we can offer a very similar experience for the
+C try operation and without needing anything compiled in C++ as support functions:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">result</span> <span class="nf">test2</span><span class="p">(</span><span class="kt">int</span> <span class="n">x</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="n">BOOST_OUTCOME_C_RESULT_SYSTEM_TRY</span><span class="p">(</span><span class="kt">int</span> <span class="n">v</span><span class="p">,</span>                                        <span class="c1">// what to set to value if successful
+</span><span class="c1"></span>                        <span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&#34;Positive numbers only!</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">),</span>  <span class="c1">// what cleanup to run if unsuccessful
+</span><span class="c1"></span>                        <span class="n">positive_only</span><span class="p">(</span><span class="n">x</span><span class="p">));</span>
+  <span class="k">return</span> <span class="n">SUCCESS</span><span class="p">(</span><span class="n">v</span> <span class="o">+</span> <span class="mi">1</span><span class="p">);</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/c_api2.cpp#L91" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The principle difference is that you can specify a cleanup routine to perform if
+failure is encountered. This is especially useful in C, which has no stack unwinding.</p>
+
+<p>Also due to lack of type sugaring and user defined implicit conversions, if your
+callers result type isn&rsquo;t your callee&rsquo;s, you may need to specify what your caller&rsquo;s
+result type is so the error state can be correctly propagated.</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-c/use.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-c.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/c-api/from-c/use.html b/doc/html/experimental/c-api/from-c/use.html
new file mode 100644
index 000000000..bba38f581
--- /dev/null
+++ b/doc/html/experimental/c-api/from-c/use.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Using a Result - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-c/declare.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-c.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../experimental/c-api/from-c/try.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Using a Result</h1></div></div></div>
+  <p>This models <a href="../../../experimental/worked-example/implicit-construction.html">the earlier C++ example of use</a>,
+and its C equivalent isn&rsquo;t much more verbose thanks to our helper typedefs and macros:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">result</span> <span class="nf">positive_only</span><span class="p">(</span><span class="kt">int</span> <span class="n">x</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">if</span><span class="p">(</span><span class="n">x</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="k">return</span> <span class="n">FAILURE</span><span class="p">(</span><span class="n">c_enum_bad_argument</span><span class="p">);</span>
+  <span class="p">}</span>
+  <span class="k">return</span> <span class="n">SUCCESS</span><span class="p">(</span><span class="n">x</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">bool</span> <span class="nf">test</span><span class="p">(</span><span class="kt">int</span> <span class="n">x</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="n">result</span> <span class="n">r</span> <span class="o">=</span> <span class="n">positive_only</span><span class="p">(</span><span class="n">x</span><span class="p">);</span>
+  <span class="k">if</span><span class="p">(</span><span class="n">BOOST_OUTCOME_C_RESULT_HAS_ERROR</span><span class="p">(</span><span class="n">r</span><span class="p">))</span>
+  <span class="p">{</span>
+    <span class="k">if</span><span class="p">(</span><span class="n">outcome_status_code_equal_generic</span><span class="p">(</span><span class="o">&amp;</span><span class="n">r</span><span class="p">.</span><span class="n">error</span><span class="p">,</span> <span class="n">EINVAL</span><span class="p">))</span>
+    <span class="p">{</span>
+      <span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&#34;Positive numbers only!</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">);</span>
+      <span class="k">return</span> <span class="nb">false</span><span class="p">;</span>
+    <span class="p">}</span>
+  <span class="p">}</span>
+  <span class="k">return</span> <span class="nb">true</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/c_api2.cpp#L66" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>For this to link, the <code>BOOST_OUTCOME_C_DECLARE_RESULT_SYSTEM_FROM_ENUM</code> macro needs to be
+compiled at least once within C++ within the final binary to emit the extern
+functions needed by C.</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-c/declare.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-c.html"><img src="../../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/experimental/c-api/from-cxx.html b/doc/html/experimental/c-api/from-cxx.html
new file mode 100644
index 000000000..4fe2be58d
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+++ b/doc/html/experimental/c-api/from-cxx.html
@@ -0,0 +1,83 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Calling C&#43;&#43; from C - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../experimental/c-api.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/c-api.html"><img src="../../images/up.png" alt="Up"></a>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">Calling C++ from C</h1></div></div></div>
+<p>C++ has excellent two-way compatibility with the C ABI, but there are some
+limitations you must observe to write C++ code which C code can call without
+marshalling at the ABI boundary:</p>
+
+<ol>
+<li><p>A C++ function may not throw exceptions if it is safe to call from C, and
+so should always be marked <code>noexcept</code>.</p></li>
+
+<li><p>A C++ function should be annotated with <code>extern &quot;C&quot;</code> to prevent its symbol
+being mangled, and thus give it the C rather than C++ ABI.</p></li>
+
+<li><p>You cannot use overloading in your <code>extern &quot;C&quot;</code> functions.</p></li>
+
+<li><p>You may only use types in your C++ function declaration for which these traits are both true:</p>
+
+<ul>
+<li><a href="http://en.cppreference.com/w/cpp/types/is_standard_layout"><code>std::is_standard_layout_v&lt;T&gt;</code></a></li>
+<li><a href="http://en.cppreference.com/w/cpp/types/is_trivially_copyable"><code>std::is_trivially_copyable_v&lt;T&gt;</code></a></li>
+</ul>
+
+<p>(Note that <code>std::is_trivially_copyable_v&lt;T&gt;</code> requires trivial destruction,
+but NOT trivial construction. This means that C++ can do non-trivial construction
+of otherwise trivial types)</p></li>
+</ol>
+
+<hr />
+
+<p>The above is what the standard officially requires for <em>well defined</em> C and C++ interop.
+However, all of the three major compilers MSVC, GCC and clang are considerably more relaxed.
+In those three major compilers, &ldquo;almost-standard-layout&rdquo; C++ types work fine in C.</p>
+
+<p>&ldquo;Almost-standard-layout&rdquo; C++ types have these requirements:</p>
+
+<ol>
+<li>No virtual functions or virtual base classes i.e.
+<a href="http://en.cppreference.com/w/cpp/types/is_polymorphic"><code>std::is_polymorphic_v&lt;T&gt;</code></a>
+must be false. This is because the vptrs offset the proper front of the data layout
+in an unknowable way to C.</li>
+<li>Non-static data members of reference type appear to C as pointers. You
+must never supply from C to C++ a non-null pointer which is seen as a reference in C++.</li>
+<li>C++ inheritance is seen in C data layout as if the most derived class has nested
+variables of the inherited types at the top, in order of inheritance.</li>
+<li>Types with non-trivial destructors work fine so long as at least move construction
+and assignment is the same as
+copying bits like <code>memcpy()</code>. You just need to make sure instances of the type return
+to C++, and don&rsquo;t get orphaned in C. This was referred to in previous pages in this
+section as &ldquo;move relocating&rdquo; types.</li>
+</ol>
+
+<p>Experimental Outcome&rsquo;s support for being used from C does not meet the current strict
+requirements, and thus relies on the (very common) implementation defined behaviour just
+described (it is hoped that future C++ standards can relax the requirements to those
+just described).</p>
+
+<p>Specifically, proposed <code>status_code</code> is an almost-standard-layout type,
+and thus while it can&rsquo;t be returned from <code>extern &quot;C&quot;</code> functions as the compiler
+will complain, it is perfectly safe to return from C++ functions to C code on the
+three major compilers, as it is an &ldquo;almost-standard-layout&rdquo; C++ type if <code>T</code> is
+an &ldquo;almost-standard-layout&rdquo; C++ type.</p>
+
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../experimental/c-api.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/c-api.html"><img src="../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/experimental/c-api/from-cxx/example.html b/doc/html/experimental/c-api/from-cxx/example.html
new file mode 100644
index 000000000..e004995f9
--- /dev/null
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Example C&#43;&#43; function - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-cxx.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-cxx.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../experimental/c-api/from-cxx/example2.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Example C++ function</h1></div></div></div>
+  <p>Let us start with a simple C++ function which we wish to make available to C code:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">outcome_e</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">experimental</span><span class="p">;</span>
+
+<span class="c1">// Fill the supplied buffer with the integer v converted to a string,
+</span><span class="c1">// returning length of string minus null terminator
+</span><span class="c1"></span><span class="n">outcome_e</span><span class="o">::</span><span class="n">status_result</span><span class="o">&lt;</span><span class="n">size_t</span><span class="o">&gt;</span> <span class="n">to_string</span><span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="n">buffer</span><span class="p">,</span> <span class="n">size_t</span> <span class="n">bufferlen</span><span class="p">,</span> <span class="kt">int</span> <span class="n">v</span><span class="p">)</span> <span class="k">noexcept</span>
+<span class="p">{</span>
+  <span class="k">try</span>
+  <span class="p">{</span>
+    <span class="c1">// Could throw an exception!
+</span><span class="c1"></span>    <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">temp</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">to_string</span><span class="p">(</span><span class="n">v</span><span class="p">));</span>
+
+    <span class="c1">// Will this string exceed the supplied buffer?
+</span><span class="c1"></span>    <span class="k">if</span><span class="p">(</span><span class="n">temp</span><span class="p">.</span><span class="n">size</span><span class="p">()</span> <span class="o">+</span> <span class="mi">1</span> <span class="o">&gt;</span> <span class="n">bufferlen</span><span class="p">)</span>
+      <span class="k">return</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">no_buffer_space</span><span class="p">;</span>
+
+    <span class="c1">// Copy the string into the supplied buffer, and return length of string
+</span><span class="c1"></span>    <span class="n">memcpy</span><span class="p">(</span><span class="n">buffer</span><span class="p">,</span> <span class="n">temp</span><span class="p">.</span><span class="n">data</span><span class="p">(),</span> <span class="n">temp</span><span class="p">.</span><span class="n">size</span><span class="p">()</span> <span class="o">+</span> <span class="mi">1</span><span class="p">);</span>
+    <span class="k">return</span> <span class="n">temp</span><span class="p">.</span><span class="n">size</span><span class="p">();</span>
+  <span class="p">}</span>
+  <span class="k">catch</span><span class="p">(...)</span>
+  <span class="p">{</span>
+    <span class="c1">// This is the &lt;system_error2&gt; analogue of Standard Outcome&#39;s
+</span><span class="c1"></span>    <span class="c1">// error_from_exception() utility function. It consumes an exception
+</span><span class="c1"></span>    <span class="c1">// ptr (defaulted to current exception), and tries to match it to a
+</span><span class="c1"></span>    <span class="c1">// standard C++ library exception type, returning a system_code
+</span><span class="c1"></span>    <span class="c1">// with an appropriate code domain (generic_code, posix_code,
+</span><span class="c1"></span>    <span class="c1">// win32_code).
+</span><span class="c1"></span>    <span class="c1">//
+</span><span class="c1"></span>    <span class="c1">// Note that using this function requires including
+</span><span class="c1"></span>    <span class="c1">// &lt;boost/outcome/experimental/system_code_from_exception.hpp&gt;
+</span><span class="c1"></span>    <span class="c1">// It is NOT included by Experimental Outcome by default.
+</span><span class="c1"></span>    <span class="k">return</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">system_code_from_exception</span><span class="p">();</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/cpp_api.cpp#L37" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>As the alias <code>status_result&lt;size_t&gt;</code> defaults the erased type to the alias <code>system_code</code>,
+the <code>to_string()</code> function returns (in concrete types) <code>basic_result&lt;size_t, status_code&lt;erased&lt;intptr_t&gt;&gt;&gt;</code>.</p>
+
+<p>The standard Outcome function referenced is documented at
+
+<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code error_from_exception(std::exception_ptr &amp;&amp;ep = std::current_exception(), std::error_code not_matched = std::make_error_code(std::errc::resource_unavailable_try_again)) noexcept</code></a>
+.
+The proposed <code>&lt;system_error2&gt;</code> reference library implementation provides an identically named
+function taking similar parameters, but it returns a <code>outcome_e::system_code</code> (<code>status_code&lt;erased&lt;intptr_t&gt;&gt;</code>) instead of a <code>std::error_code</code>.</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-cxx.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-cxx.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../experimental/c-api/from-cxx/example2.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/c-api/from-cxx/example2.html b/doc/html/experimental/c-api/from-cxx/example2.html
new file mode 100644
index 000000000..facaf3a87
--- /dev/null
+++ b/doc/html/experimental/c-api/from-cxx/example2.html
@@ -0,0 +1,77 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Calling it from C - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-cxx/example.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../experimental/c-api/from-cxx.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../experimental/c-api/from-c.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Calling it from C</h1></div></div></div>
+  <p>Firstly we need to declare to C our <code>result</code> returning C++ function:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// Declare our C++ function&#39;s returning result type. Only needs to be done once.
+</span><span class="c1">// This declares an `status_result&lt;size_t, system_code&gt;` which is an alias to
+</span><span class="c1">// `basic_result&lt;size_t, status_code&lt;erased&lt;intptr_t&gt;&gt;&gt;`.
+</span><span class="c1">//
+</span><span class="c1">// The first parameter is some unique identifier for this type which will be used
+</span><span class="c1">// whenever we reference this type in the future.
+</span><span class="c1"></span><span class="n">CXX_DECLARE_RESULT_SYSTEM</span><span class="p">(</span><span class="n">to_string_rettype</span><span class="p">,</span> <span class="n">size_t</span><span class="p">)</span>
+
+<span class="c1">// Tell C about our extern C++ function `to_string()`
+</span><span class="c1"></span><span class="k">extern</span> <span class="n">CXX_RESULT_SYSTEM</span><span class="p">(</span><span class="n">to_string_rettype</span><span class="p">)</span> <span class="n">_Z9to_stringPcmi</span><span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="n">buffer</span><span class="p">,</span> <span class="n">size_t</span> <span class="n">bufferlen</span><span class="p">,</span> <span class="kt">int</span> <span class="n">v</span><span class="p">);</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/c_api.c#L40" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Now let&rsquo;s call the C++ function from C:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">void</span> <span class="nf">print</span><span class="p">(</span><span class="kt">int</span> <span class="n">v</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="kt">char</span> <span class="n">buffer</span><span class="p">[</span><span class="mi">4</span><span class="p">];</span>
+  <span class="n">CXX_RESULT_SYSTEM</span><span class="p">(</span><span class="n">to_string_rettype</span><span class="p">)</span> <span class="n">res</span><span class="p">;</span>
+
+  <span class="n">res</span> <span class="o">=</span> <span class="n">_Z9to_stringPcmi</span><span class="p">(</span><span class="n">buffer</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">v</span><span class="p">);</span>
+  <span class="k">if</span><span class="p">(</span><span class="n">CXX_RESULT_HAS_VALUE</span><span class="p">(</span><span class="n">res</span><span class="p">))</span>
+  <span class="p">{</span>
+    <span class="n">printf</span><span class="p">(</span><span class="s">&#34;to_string(%d) fills buffer with &#39;%s&#39; of %zu characters</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span> <span class="n">v</span><span class="p">,</span> <span class="n">buffer</span><span class="p">,</span> <span class="n">res</span><span class="p">.</span><span class="n">value</span><span class="p">);</span>
+    <span class="k">return</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="c1">// Is the error returned in the POSIX domain and thus an errno?
+</span><span class="c1"></span>  <span class="k">if</span><span class="p">(</span><span class="n">CXX_RESULT_ERROR_IS_ERRNO</span><span class="p">(</span><span class="n">res</span><span class="p">))</span>
+  <span class="p">{</span>
+    <span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&#34;to_string(%d) failed with error code %d (%s)</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span> <span class="n">v</span><span class="p">,</span> <span class="p">(</span><span class="kt">int</span><span class="p">)</span> <span class="n">res</span><span class="p">.</span><span class="n">error</span><span class="p">.</span><span class="n">value</span><span class="p">,</span> <span class="n">strerror</span><span class="p">((</span><span class="kt">int</span><span class="p">)</span> <span class="n">res</span><span class="p">.</span><span class="n">error</span><span class="p">.</span><span class="n">value</span><span class="p">));</span>
+    <span class="k">return</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&#34;to_string(%d) failed with unknown error code %lld</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span> <span class="n">v</span><span class="p">,</span> <span class="p">(</span><span class="kt">long</span> <span class="kt">long</span><span class="p">)</span> <span class="n">res</span><span class="p">.</span><span class="n">error</span><span class="p">.</span><span class="n">value</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="n">print</span><span class="p">(</span><span class="mi">9</span><span class="p">);</span>
+  <span class="n">print</span><span class="p">(</span><span class="mi">99</span><span class="p">);</span>
+  <span class="n">print</span><span class="p">(</span><span class="mi">999</span><span class="p">);</span>
+  <span class="n">print</span><span class="p">(</span><span class="mi">9999</span><span class="p">);</span>
+  <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/c_api.c#L53" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Running this C program yields:</p>
+
+<pre><code>to_string(9) fills buffer with '9' of 1 characters
+to_string(99) fills buffer with '99' of 2 characters
+to_string(999) fills buffer with '999' of 3 characters
+to_string(9999) failed with error code 105 (No buffer space available)
+</code></pre>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../experimental/c-api/from-cxx/example.html"><img src="../../../images/prev.png" alt="Prev"></a>
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+</html>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Major differences - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+<a accesskey="p" href="../experimental/map.html"><img src="../images/prev.png" alt="Prev"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">Major differences</h1></div></div></div>
+  <p>The major design differences between <code>&lt;system_error&gt;</code> and proposed <code>&lt;system_error2&gt;</code> are
+as follows:</p>
+
+<ol>
+<li><p><code>experimental::status_code&lt;DomainType&gt;</code> can represent warnings
+and form-of-success codes as well as failure codes. <code>experimental::errored_status_code&lt;DomainType&gt;</code>
+is more similar to <code>std::error_code</code>, in that it can only represent failures
+(this is enforced by C++ 20 contract or runtime assertion check).</p></li>
+
+<li><p>The code&rsquo;s domain implementation defines the payload type to be transported around by
+<code>experimental::status_code&lt;DomainType&gt;</code>, rather than it being
+hardcoded to <code>int</code> as in <code>std::error_code</code>. The payload type can be anything
+you like, including non-trivially-copyable, move-only, complex etc types.</p>
+
+<p>This facility is extremely useful. Extra failure metadata such as stack
+backtraces can be returned, for example. You can absolutely vary the payload
+depending on whether <code>NDEBUG</code> or <code>_DEBUG</code> is defined, too.</p></li>
+
+<li><p>If your domain defines a payload type which is trivially copyable or
+move relocating<sup class="footnote-ref" id="fnref:1"><a href="#fn:1">1</a></sup>, it gains an implicit convertibility to a move-only
+<code>experimental::status_code&lt;erased&lt;T&gt;&gt;</code> where <code>T</code> is another
+trivially copyable or move relocating type. This permits global headers
+to use a single, common, type erased, status code type which is highly
+desirable for code bases of any complexity. However, unlike <code>std::error_code</code>,
+which fulfils the exact same role in <code>&lt;system_error&gt;</code> based code, the type
+erased payload can be bigger than the hardcoded <code>int</code> in <code>std::error_code</code>.</p>
+
+<p>This facility is also extremely useful, as extra failure metadata can be
+type erased, transported through code with no knowledge of such things,
+and the original type with failure metadata resurrected at the handling point.
+Indeed P1095 proposed <code>std::error</code> is a type alias to
+<code>experimental::status_code&lt;erased&lt;intptr_t&gt;&gt;</code>, and it can transport erased
+<code>std::exception_ptr</code> instances, POSIX error codes, and much more besides.</p></li>
+
+<li><p>Equality comparisons between status code&rsquo;s with non-identical domains are
+always <b><em>semantic</em></b> i.e. are they semantically equivalent, rather than exactly
+equal? This mirrors when you compare <code>std::error_code</code> to a <code>std::error_condition</code>,
+but as there is no equivalent for the latter in <code>&lt;system_error2&gt;</code>, this means
+that when you see the code:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">if</span><span class="p">(</span><span class="n">code1</span> <span class="o">==</span> <span class="n">code2</span><span class="p">)</span> <span class="p">...</span>
+</code></pre></div>
+<p>&hellip; you can be highly confident that this is an inexact, semantic, match operation.
+The same code under <code>&lt;system_error&gt;</code> is highly ambiguous as to whether exact
+or inexact comparison is being performed (after all, all there is is &ldquo;<code>code1 == code2</code>&rdquo;,
+so it depends on the types of <code>code1</code> and <code>code2</code> which usually is not obvious).</p>
+
+<p>The ambiguity, and high cognitive load during auditing <code>&lt;system_error&gt;</code> code for correctness, has
+led to many surprising and unexpected failure handling bugs during the past
+decade in production C++.</p></li>
+
+<li><p><code>&lt;system_error2&gt;</code>, being a new design, has all-constexpr construction and
+destruction which avoids the need for static global variables, as <code>&lt;system_error&gt;</code>
+has. Each of those static global variables requires an atomic fence just in
+case it has not been initialised, thus every retrieval of an error category bloats
+code and inhibits optimisation, plus makes the use of custom error code categories
+in header-only libraries unreliable. Boost.System has replicated the all-constexpr
+construction and destruction from <code>&lt;system_error2&gt;</code>, and thus now has similar
+characteristics in this regard.</p></li>
+
+<li><p>Finally, this is a small but important difference. Under <code>&lt;system_error&gt;</code>,
+this extremely common use case is ambiguous:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">if</span><span class="p">(</span><span class="n">ec</span><span class="p">)</span> <span class="p">...</span>
+</code></pre></div>
+<p>Does this code mean &ldquo;if there was an error?&rdquo;, or &ldquo;if the error code is set?&rdquo;,
+or &ldquo;is the error code non-zero?&rdquo;. The correct answer according to the standard is the last choice, but
+a quick survey of open source <code>&lt;system_error&gt;</code> based code on github quickly
+demonstrates there is widespread confusion regarding correct usage.</p>
+
+<p><code>&lt;system_error2&gt;</code> solves this by removing the boolean test entirely. One
+now writes <code>if(sc.success()) ...</code>, <code>if(sc.failure()) ...</code>, <code>if(sc.empty()) ...</code>
+and so on, thus eliminating ambiguity.</p></li>
+</ol>
+<div class="footnotes">
+
+<hr />
+
+<ol>
+<li id="fn:1"><a href="http://wg21.link/P1029">Move relocating is not in the standard, it is currently within WG21 Evolution Working Group Incubator</a>. It is defined to be a type whose move constructor <code>memcpy()</code>&rsquo;s the bits from source to destination, followed by <code>memcpy()</code> of the bits of a default constructed instance to source, and with a programmer-given guarantee that the destructor, when called on a default constructed instance, has no observable side effects. A surprising number of standard library types can meet this definition of move relocating, including <code>std::vector&lt;T&gt;</code>, <code>std::shared_ptr&lt;T&gt;</code>, and <code>std::exception_ptr</code>.
+ <a class="footnote-return" href="#fnref:1"><sup>[return]</sup></a></li>
+</ol>
+</div>
+
+
+        </div><p><small>Last revised: December 16, 2020 at 14:14:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Approximate map between error code designs - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
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+  <div class="titlepage"><div><div><h1 style="clear: both">Approximate map between error code designs</h1></div></div></div>
+  <p>Much of the design of Boost.System (which went on to become <code>&lt;system_error&gt;</code>)
+has been retained in proposed <code>&lt;system_error2&gt;</code>, so an approximate map between
+<code>&lt;system_error2&gt;</code> and <code>&lt;system_error&gt;</code> and Boost.System can be given:</p>
+
+<table width="100%" cellpadding="5" border="1">
+<colgroup>
+ <col width="25%">
+ <col width="25%">
+ <col width="50%">
+</colgroup>
+<tr><th>C++ 17 <tt>&lt;system_error&gt;</tt><th>Boost.System<th>Proposed <tt>&lt;system_error2&gt;</tt>
+<tr>
+ <td style="vertical-align: top;"><tt>std::errc</tt>
+ <td style="vertical-align: top;"><tt>boost::system::errc</tt>
+ <td style="vertical-align: top;"><tt>experimental::errc</tt> (almost identical)
+<tr>
+ <td style="vertical-align: top;"><tt>std::error_category</tt>
+ <td style="vertical-align: top;"><tt>boost::system::error_category</tt>
+ <td style="vertical-align: top;"><tt>experimental::status_code_domain</tt>
+<tr>
+ <td style="vertical-align: top;"><tt>std::generic_category</tt>
+ <td style="vertical-align: top;"><tt>boost::system::generic_category</tt>
+ <td style="vertical-align: top;"><tt>experimental::generic_code_domain</tt>
+<tr>
+ <td style="vertical-align: top;"><tt>std::system_category</tt>
+ <td style="vertical-align: top;"><tt>boost::system::system_category</tt>
+ <td style="vertical-align: top;">One of:<ul>
+  <li><tt>experimental::posix_code_domain</tt> (POSIX systems)<p>
+  <li><tt>experimental::win32_code_domain</tt> (Microsoft Windows)<p>
+  <li><tt>experimental::nt_code_domain</tt> (Microsoft Windows)
+ </ul>
+ Note that there are more precanned code categories though they require additional header inclusions:
+<tt>com_code</tt>, <tt>getaddrinfo_code</tt>.
+<tr>
+ <td style="vertical-align: top;"><tt>std::error_condition</tt>
+ <td style="vertical-align: top;"><tt>boost::system::error_condition</tt>
+ <td style="vertical-align: top;"><b>No equivalent</b> (deliberately removed as hindsight proved it to be a design mistake leading to much confusing and hard to audit for correctness code)
+<tr>
+ <td style="vertical-align: top;"><tt>std::error_code</tt>
+ <td style="vertical-align: top;"><tt>boost::system::error_code</tt>
+ <td style="vertical-align: top;">One of:<ul>
+  <li><tt>experimental::status_code&lt;DomainType&gt;</tt><p>
+  <li><tt>const experimental::status_code&lt;void&gt; &amp;</tt><p>
+  <li><tt>experimental::status_code&lt;erased&lt;intptr_t&gt;&gt;</tt> (aliased to <tt>experimental::system_code</tt>)<p>
+  <li><tt>experimental::errored_status_code&lt;DomainType&gt;</tt><p>
+  <li><tt>const experimental::errored_status_code&lt;void&gt; &amp;</tt><p>
+  <li><tt>experimental::errored_status_code&lt;erased&lt;intptr_t&gt;&gt;</tt> (aliased to <tt>experimental::error</tt>)
+ </ul>
+ The difference between status codes and errored status codes is that the latter are guaranteed
+ to refer to a failure, whereas the former may refer to a success (including warnings and informationals).
+<tr>
+ <td style="vertical-align: top;"><tt>std::system_error</tt>
+ <td style="vertical-align: top;"><tt>boost::system::system_error</tt>
+ <td style="vertical-align: top;">One of:<ul>
+  <li><tt>const experimental::status_error&lt;void&gt; &amp;</tt><p>
+  <li><tt>experimental::status_error&lt;DomainType&gt;</tt>
+ </ul>
+</table>
+
+<p>As is obvious from the above, in <code>&lt;system_error2&gt;</code> one must be much more specific and accurate
+with respect to intent and specification and desired semantics than with <code>&lt;system_error&gt;</code>. Much
+ambiguity and incorrectness which flies silently in <code>&lt;system_error&gt;</code> will
+refuse to compile in <code>&lt;system_error2&gt;</code>.</p>
+
+
+        </div><p><small>Last revised: December 16, 2020 at 14:14:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../experimental/advantages.html"><img src="../images/prev.png" alt="Prev"></a>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Tying it all together - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
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+  <div class="titlepage"><div><div><h1 style="clear: both">Tying it all together</h1></div></div></div>
+  
+
+<p>Firstly let&rsquo;s alias a more convenient form of <code>status_result</code>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">E</span> <span class="o">=</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">error</span><span class="o">&gt;</span>
+<span class="k">using</span> <span class="n">result</span> <span class="o">=</span>  <span class="c1">//
+</span><span class="c1"></span><span class="n">outcome_e</span><span class="o">::</span><span class="n">status_result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="p">,</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">policy</span><span class="o">::</span><span class="n">default_status_result_policy</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;&gt;</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/experimental_status_code.cpp#L197" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>(The defaulting of <code>default_result_policy</code> is superfluous, it&rsquo;s already the default)</p>
+
+<p>What follows now is very standard Outcome code. Indeed, it would compile
+just fine under standard Outcome with only a few typedefs.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">result</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="p">,</span> <span class="n">file_io_error</span><span class="o">&gt;</span> <span class="n">open_file</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">path</span><span class="p">)</span>  <span class="c1">// models throws(file_io_error)
+</span><span class="c1"></span><span class="p">{</span>
+  <span class="n">file_handle</span> <span class="n">ret</span><span class="p">(</span><span class="o">::</span><span class="n">fopen</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s">&#34;r&#34;</span><span class="p">));</span>
+  <span class="k">if</span><span class="p">(</span><span class="n">ret</span><span class="p">)</span>
+    <span class="k">return</span> <span class="n">ret</span><span class="p">;</span>
+  <span class="k">return</span> <span class="nf">file_io_error</span><span class="p">({</span><span class="n">errno</span><span class="p">,</span> <span class="n">__LINE__</span><span class="p">,</span> <span class="n">__FILE__</span><span class="p">});</span>
+<span class="p">}</span>
+
+<span class="n">result</span><span class="o">&lt;</span><span class="kt">void</span><span class="o">&gt;</span> <span class="n">open_resource</span><span class="p">()</span>  <span class="c1">// models throws(std::error)
+</span><span class="c1"></span><span class="p">{</span>
+  <span class="k">for</span><span class="p">(;;)</span>
+  <span class="p">{</span>
+    <span class="n">result</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="p">,</span> <span class="n">file_io_error</span><span class="o">&gt;</span> <span class="n">r</span> <span class="o">=</span> <span class="n">open_file</span><span class="p">(</span><span class="s">&#34;some file&#34;</span><span class="p">);</span>
+    <span class="k">if</span><span class="p">(</span><span class="n">r</span><span class="p">)</span>
+      <span class="k">break</span><span class="p">;</span>
+    <span class="n">file_io_error</span> <span class="n">e</span> <span class="o">=</span> <span class="n">r</span><span class="p">.</span><span class="n">error</span><span class="p">();</span>
+    <span class="k">if</span><span class="p">(</span><span class="n">e</span> <span class="o">!=</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">resource_unavailable_try_again</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="c1">// NOTE this implicitly converts from `file_io_error` to `error` via the
+</span><span class="c1"></span>      <span class="c1">// `make_status_code()` free function customisation point defined above.
+</span><span class="c1"></span>      <span class="k">return</span> <span class="n">e</span><span class="p">;</span>
+    <span class="p">}</span>
+  <span class="p">}</span>
+  <span class="c1">// success continues here ...
+</span><span class="c1"></span>  <span class="k">return</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">success</span><span class="p">();</span>
+<span class="p">}</span>
+
+<span class="kt">int</span> <span class="n">main</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="n">result</span><span class="o">&lt;</span><span class="kt">void</span><span class="o">&gt;</span> <span class="n">r</span> <span class="o">=</span> <span class="n">open_resource</span><span class="p">();</span>
+  <span class="k">if</span><span class="p">(</span><span class="n">r</span><span class="p">)</span>
+    <span class="n">printf</span><span class="p">(</span><span class="s">&#34;Success!</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">);</span>
+  <span class="k">else</span>
+  <span class="p">{</span>
+    <span class="k">auto</span> <span class="n">e</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">r</span><span class="p">).</span><span class="n">error</span><span class="p">();</span>
+    <span class="c1">// A quick demonstration that the indirection works as indicated
+</span><span class="c1"></span>    <span class="n">printf</span><span class="p">(</span><span class="s">&#34;Returned error has a code domain of &#39;%s&#39;, a message of &#39;%s&#39;</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span> <span class="n">e</span><span class="p">.</span><span class="n">domain</span><span class="p">().</span><span class="n">name</span><span class="p">().</span><span class="n">c_str</span><span class="p">(),</span> <span class="n">e</span><span class="p">.</span><span class="n">message</span><span class="p">().</span><span class="n">c_str</span><span class="p">());</span>
+    <span class="n">printf</span><span class="p">(</span><span class="s">&#34;</span><span class="se">\n</span><span class="s">And semantically comparing it to &#39;errc::no_such_file_or_directory&#39; = %d</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span> <span class="n">e</span> <span class="o">==</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">no_such_file_or_directory</span><span class="p">);</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/experimental_status_code.cpp#L202" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>And running this program yields:</p>
+
+<pre><code>Returned error has a code domain of 'file i/o error domain', a message of 'No such file or directory (c:\users\ned\documents\boostish\outcome\doc\src\snippets\experimental_status_code.cpp:195)'
+
+And semantically comparing it to 'errc::no_such_file_or_directory' = 1
+</code></pre>
+
+<h3 id="conclusion">Conclusion</h3>
+
+<p>Once you get used to <code>&lt;system_error2&gt;</code> and the fact that any <code>result</code> with
+<code>E = error</code> is always move-only, using experimental Outcome is just like
+using normal Outcome. Except that codegen will be better, custom domains
+are safe to use in headers, semantic comparisons have guaranteed complexity
+bounds, and build times are much reduced.</p>
+
+<p>What&rsquo;s not to like? :)</p>
+
+<p>Finally, if you have feedback on using experimental Outcome which you think
+would be of use to the standards committee when evaluating possible
+implementations of <a href="http://wg21.link/P0709">P0709 <em>Zero overhead exceptions: Throwing values</em></a>,
+please do get in touch! This <strong>especially</strong> includes successful experiences!!!</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../experimental/status_result.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
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index 000000000..a57b5587a
--- /dev/null
+++ b/doc/html/experimental/status_result.html
@@ -0,0 +1,81 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>status_result and status_outcome - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../experimental/differences.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../experimental/outcome.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>status_result</code> and <code>status_outcome</code></h1></div></div></div>
+  <p><code>status_result</code> and <code>status_outcome</code> are type aliases to <a href="../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+
+and <a href="../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+ in the usual way, but
+with a defaulted <code>NoValuePolicy</code> which selects on the basis of <code>status_code&lt;DomainType&gt;</code>
+instead.</p>
+
+<div class="notices note" style="background: url('../images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>If the <code>E</code> type is not some <code>status_code&lt;&gt;</code>, the default policy selector
+will complain.</p>
+</div>
+</div>
+
+
+<p>The specifications are:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">experimental</span><span class="o">::</span><span class="n">status_result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span> <span class="o">=</span> <span class="n">experimental</span><span class="o">::</span><span class="n">error</span><span class="o">&gt;</span>
+<span class="n">experimental</span><span class="o">::</span><span class="n">status_outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span> <span class="o">=</span> <span class="n">experimental</span><span class="o">::</span><span class="n">error</span><span class="p">,</span> <span class="n">EP</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">exception_ptr</span><span class="o">&gt;</span>
+</code></pre></div>
+<p>So, the default <code>E</code> is the erased errored status code <code>system_code</code>, which can represent
+any <code>generic_code</code>, <code>posix_code</code>, <code>win32_code</code>, <code>nt_code</code>, <code>com_code</code> and many
+other integer error and status
+codings. Because it is an errored status code, it will always represent a failure.</p>
+
+<p>You can absolutely choose an <code>E</code> type which is non-erased e.g. <code>posix_code</code> directly.
+You can also choose an <code>E</code> type which is not contract guaranteed to be a failure,
+though your users may find that surprising.</p>
+
+<p>Whether to choose typed status codes versus the erased status codes depends on your
+use cases. Outcome replicates faithfully the implicit and explicit conversion
+semantics of its underlying types, so you can mix results and outcomes of
+<code>&lt;system_error2&gt;</code> types exactly as you can the <code>&lt;system_error2&gt;</code> types themselves
+e.g. typed forms will implicitly convert into erased forms if the source type
+is trivially copyable or move relocating. This means that you can return a
+<code>generic_code</code> from a function returning a <code>system_code</code> or <code>error</code>, and it&rsquo;ll
+work exactly as you&rsquo;d expect (implicit conversion).</p>
+
+<div class="notices note" style="background: url('../images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>As <code>status_code&lt;erased&lt;T&gt;&gt;</code> is move-only, so is any <code>status_result</code> or <code>status_outcome</code>.
+For some reason this surprises a lot of people, and they tend to react by not using the erased
+form because it seems &ldquo;difficult&rdquo;.</p>
+</div>
+</div>
+
+
+<p>It is actually, in fact, a wise discipline to follow to make all functions return
+move-only types if you care about determinism and performance. Whilst C++ 17 onwards
+does much to have the compiler avoid copying of identical function return values thanks to
+guaranteed copy elision, when a chain of functions return different types, if the
+programmer forgets to scatter <code>std::move()</code> appropriately, copies rather than moves
+tend to occur in non-obvious ways. No doubt future C++ standards will improve on the
+automatic use of moves instead of copies where possible, but until then making all
+your <code>result</code> and <code>outcome</code> types move-only is an excellent discipline.</p>
+
+<p>Note that move-only <code>result</code> and <code>outcome</code> capable code (i.e. your project is in Experimental
+Outcome configuration) usually compiles fine when <code>result</code> and <code>outcome</code> are copyable
+(i.e. your project is in Standard Outcome configuration), albeit sometimes with a few
+compiler warnings about unnecessary use of <code>std::move()</code>.</p>
+
+
+        </div><p><small>Last revised: December 16, 2020 at 14:14:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../experimental/differences.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/experimental/worked-example-long.html b/doc/html/experimental/worked-example-long.html
new file mode 100644
index 000000000..b43d096de
--- /dev/null
+++ b/doc/html/experimental/worked-example-long.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Worked example: Custom domain (the long way) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../experimental/worked-example/implicit-construction.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../experimental/worked-example-long/preamble.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Worked example: Custom domain (the long way)</h1></div></div></div>
+
+
+<p>Here follows a longer worked example of use of Experimental Outcome. It presents
+the same sample program I sent to the San Diego 2018 WG21 standards meeting
+after I was asked by the committee to demonstrate how P1095 implements P0709
+in a working code example they could study and discuss.</p>
+
+<p>We will walk through this worked example, step by step, explaining how each
+part works in detail. This will help you implement your own code based on
+Experimental Outcome.</p>
+
+<p>Most users will not need this level of customisation, and for them the preceding
+<a href="../experimental/worked-example.html">quick and easy approach</a> will be much easier.</p>
+
+<p>You may find it useful to open now in a separate browser tab the reference API
+documentation for proposed <code>&lt;system_error2&gt;</code> at <a href="https://ned14.github.io/status-code/">https://ned14.github.io/status-code/</a>
+(scroll half way down). The references in the comments to P1028 are to
+<a href="http://wg21.link/P1028">P1028 <em>SG14 status_code and standard error object for P0709 Zero-overhead
+deterministic exceptions</em></a>, which is the WG21 proposal
+paper for potential <code>&lt;system_error2&gt;</code>.</p>
+
+<h3 id="goal-of-this-section">Goal of this section</h3>
+
+<p>We are going to define a simple custom code domain which defines that
+the status code&rsquo;s payload will consist of a POSIX error code, and the
+<code>__FILE__</code> and <code>__LINE__</code> where the failure occurred. This custom status
+code will have an implicit conversion to type erased <code>error</code> defined, which dynamically
+allocates memory for the original status code, and outputs an <code>error</code>
+which manages that dynamic allocation, indirecting all queries etc
+to the erased custom status code type such that the <code>error</code> instance
+quacks as if just like the original. This demonstrates that <code>error</code> could
+just as equally convey a <code>std::exception_ptr</code>, for example, or indeed
+manage the lifetime of any pointer.</p>
+
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../experimental/worked-example/implicit-construction.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../experimental/worked-example-long/preamble.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/worked-example-long/constructor.html b/doc/html/experimental/worked-example-long/constructor.html
new file mode 100644
index 000000000..0c250116e
--- /dev/null
+++ b/doc/html/experimental/worked-example-long/constructor.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>The constructor - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/value_type.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/string_ref.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">The constructor</h1></div></div></div>
+  <p>Code domains are 100% constexpr to construct and destruct, as are status codes.
+This enables the compiler to 100% instantiate both only in its mind, and to emit
+zero code and thus zero overhead.</p>
+
+<p>Unfortunately it also means that it must be possible for each domain to be instantiated an infinite
+number of times, and being 100% in constexpr, any instances never have a unique
+address in memory either. Thus we cannot compare domains for equivalence using
+their address in memory, as 
+<a href="https://en.cppreference.com/w/cpp/error/error_category" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_category</code></a>
+ does.</p>
+
+<p>We solve this by using a <em>very</em> random 64 bit number taken from a hard random
+number source. The website <a href="https://www.random.org/cgi-bin/randbyte?nbytes=8&amp;format=h">https://www.random.org/cgi-bin/randbyte?nbytes=8&amp;format=h</a>
+is strongly suggested as the source for this number.</p>
+
+<p>(In case you are wondering about the chance of collision for a 64 bit integer, SG14 estimated that
+approximately 190,000 separate domains would need to exist in a single process
+for there to be a 0.00000001% probability of collision if the random number
+source is very random)</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// unique id must be from a hard random number source
+</span><span class="c1"></span>  <span class="c1">// Use https://www.random.org/cgi-bin/randbyte?nbytes=8&amp;format=h to get a hard random 64 bit id.
+</span><span class="c1"></span>  <span class="c1">// Do NOT make up your own value. Do NOT use zero.
+</span><span class="c1"></span>  <span class="k">constexpr</span> <span class="k">explicit</span> <span class="nf">_file_io_error_domain</span><span class="p">(</span><span class="k">typename</span> <span class="n">_base</span><span class="o">::</span><span class="n">unique_id_type</span> <span class="n">id</span> <span class="o">=</span> <span class="mh">0x230f170194fcc6c7</span><span class="p">)</span> <span class="k">noexcept</span> <span class="o">:</span> <span class="n">_base</span><span class="p">(</span><span class="n">id</span><span class="p">)</span> <span class="p">{}</span>
+  <span class="k">static</span> <span class="kr">inline</span> <span class="k">constexpr</span> <span class="k">const</span> <span class="n">_file_io_error_domain</span> <span class="o">&amp;</span><span class="n">get</span><span class="p">();</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/experimental_status_code.cpp#L97" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>A nice side effect of this approach is that custom error domains in header-only
+libraries are safe, unlike custom <code>&lt;system_error&gt;</code> error categories. Boost.System&rsquo;s
+error categories can now opt into this same safe mechanism in order to also be
+safe in header only library use cases.</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/value_type.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/string_ref.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/worked-example-long/implicit_conversion.html b/doc/html/experimental/worked-example-long/implicit_conversion.html
new file mode 100644
index 000000000..376dd6046
--- /dev/null
+++ b/doc/html/experimental/worked-example-long/implicit_conversion.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Implicit conversion - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/source.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/c-api.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Implicit conversion</h1></div></div></div>
+  <p>Back in <a href="../../experimental/worked-example-long/value_type.html">The payload</a>, we
+mentioned that there was no default implicit conversion of <code>file_io_error</code>
+(<code>status_code&lt;_file_io_error_domain&gt;</code>) to <code>error</code>, as <code>error</code> is too small
+to hold <code>_file_io_error_domain::value_type</code>.</p>
+
+<p>We can tell the framework about available implicit conversions by defining
+an ADL discovered free function <code>make_status_code()</code> which takes our
+custom status code as input, and returns an <code>error</code>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// Now tell `error` how it can implicitly construct from `file_io_error`.
+</span><span class="c1">// This is done by us defining a free function called `make_status_code()`
+</span><span class="c1">// which is discovered using ADL. `error` is an alias to the refinement
+</span><span class="c1">// `status_code&lt;erased&lt;intptr_t&gt;&gt;` which is a status code whose value type
+</span><span class="c1">// has been erased into an `intptr_t`. `status_code&lt;erased&lt;intptr_t&gt;&gt;`
+</span><span class="c1">// (i.e. `error`) are move bitcopying (P1029) i.e. they are move-only
+</span><span class="c1">// types whose move operation is defined to leave the source in the same
+</span><span class="c1">// representation as a default constructed instance, and for whose
+</span><span class="c1">// non-trivial destructor when called upon a default constructed instance
+</span><span class="c1">// is guaranteed to do nothing.
+</span><span class="c1"></span><span class="kr">inline</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">system_code</span> <span class="n">make_status_code</span><span class="p">(</span><span class="n">file_io_error</span> <span class="n">v</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="c1">// `make_nested_status_code()` dynamically allocates memory to store an
+</span><span class="c1"></span>  <span class="c1">// instance of `file_io_error`, then returns a status code whose domain
+</span><span class="c1"></span>  <span class="c1">// specifies that its value type is a pointer to `file_io_error`. The
+</span><span class="c1"></span>  <span class="c1">// domain is a templated instance which indirects all observers of the
+</span><span class="c1"></span>  <span class="c1">// status code to the pointed-to status code.
+</span><span class="c1"></span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="c1">// Note that the status code returned&#39;s value type is a pointer, which
+</span><span class="c1"></span>  <span class="c1">// by definition fits into `intptr_t` and is trivially copyable.
+</span><span class="c1"></span>  <span class="c1">// Therefore `system_code` (which is also a type alias to
+</span><span class="c1"></span>  <span class="c1">// `status_code&lt;erased&lt;intptr_t&gt;&gt;`) is happy to implicitly construct
+</span><span class="c1"></span>  <span class="c1">// from the status code returned by `make_nested_status_code()`.
+</span><span class="c1"></span>  <span class="k">return</span> <span class="n">make_nested_status_code</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">v</span><span class="p">));</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/experimental_status_code.cpp#L153" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>We are now ready to use Experimental Outcome!</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/source.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/c-api.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/worked-example-long/message.html b/doc/html/experimental/worked-example-long/message.html
new file mode 100644
index 000000000..b2c6a5254
--- /dev/null
+++ b/doc/html/experimental/worked-example-long/message.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Redefining message() - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/string_ref.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/source.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Redefining <code>message()</code></h1></div></div></div>
+  <p>You may remember that our custom <code>_file_io_error_domain</code> inherits from
+<code>outcome_e::posix_code::domain_type</code>, and thus does not have to
+implement the many pure virtual functions required by <code>outcome_e::status_code_domain</code>.</p>
+
+<p>What we do need to do is reimplement <code>_do_message()</code> to append the
+file and line information to the POSIX error description string
+returned by <code>outcome_e::posix_code::domain_type</code>. This causes
+the status code&rsquo;s <code>.message()</code> observer to return a string
+with the extra payload information represented in text.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// Return a string describing a specific code. We will return the
+</span><span class="c1"></span>  <span class="c1">// string returned by our POSIX code base domain, with the source
+</span><span class="c1"></span>  <span class="c1">// file and line number appended
+</span><span class="c1"></span>  <span class="k">virtual</span> <span class="n">_base</span><span class="o">::</span><span class="n">string_ref</span> <span class="n">_do_message</span><span class="p">(</span><span class="k">const</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">status_code</span><span class="o">&lt;</span><span class="kt">void</span><span class="o">&gt;</span> <span class="o">&amp;</span><span class="n">code</span><span class="p">)</span> <span class="k">const</span> <span class="k">noexcept</span> <span class="k">override</span> <span class="k">final</span>  <span class="c1">// NOLINT
+</span><span class="c1"></span>  <span class="p">{</span>
+    <span class="n">assert</span><span class="p">(</span><span class="n">code</span><span class="p">.</span><span class="n">domain</span><span class="p">()</span> <span class="o">==</span> <span class="o">*</span><span class="k">this</span><span class="p">);</span>
+
+    <span class="c1">// Fetch message from base domain (POSIX)
+</span><span class="c1"></span>    <span class="k">auto</span> <span class="n">msg</span> <span class="o">=</span> <span class="n">_base</span><span class="o">::</span><span class="n">_do_message</span><span class="p">(</span><span class="n">code</span><span class="p">);</span>
+    <span class="k">const</span> <span class="k">auto</span> <span class="o">&amp;</span><span class="n">c1</span> <span class="o">=</span> <span class="k">static_cast</span><span class="o">&lt;</span><span class="k">const</span> <span class="n">file_io_error</span> <span class="o">&amp;&gt;</span><span class="p">(</span><span class="n">code</span><span class="p">);</span>  <span class="c1">// NOLINT
+</span><span class="c1"></span>    <span class="k">const</span> <span class="n">value_type</span> <span class="o">&amp;</span><span class="n">v</span> <span class="o">=</span> <span class="n">c1</span><span class="p">.</span><span class="n">value</span><span class="p">();</span>
+
+    <span class="c1">// Append my source file and line number
+</span><span class="c1"></span>    <span class="k">if</span><span class="p">(</span><span class="n">v</span><span class="p">.</span><span class="n">file</span> <span class="o">==</span> <span class="k">nullptr</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="k">return</span> <span class="n">msg</span><span class="p">;</span>
+    <span class="p">}</span>
+    <span class="n">size_t</span> <span class="n">length</span> <span class="o">=</span> <span class="n">strlen</span><span class="p">(</span><span class="n">v</span><span class="p">.</span><span class="n">file</span><span class="p">)</span> <span class="o">+</span> <span class="mi">16</span> <span class="o">+</span> <span class="n">msg</span><span class="p">.</span><span class="n">size</span><span class="p">();</span>
+    <span class="k">auto</span> <span class="o">*</span><span class="n">p</span> <span class="o">=</span> <span class="k">static_cast</span><span class="o">&lt;</span><span class="kt">char</span> <span class="o">*&gt;</span><span class="p">(</span><span class="n">malloc</span><span class="p">(</span><span class="n">length</span><span class="p">));</span>  <span class="c1">// NOLINT
+</span><span class="c1"></span>    <span class="k">if</span><span class="p">(</span><span class="n">p</span> <span class="o">==</span> <span class="k">nullptr</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="k">return</span> <span class="n">_base</span><span class="o">::</span><span class="n">string_ref</span><span class="p">(</span><span class="s">&#34;failed to get message from system&#34;</span><span class="p">);</span>
+    <span class="p">}</span>
+    <span class="n">sprintf</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="s">&#34;%s (%s:%d)&#34;</span><span class="p">,</span> <span class="n">msg</span><span class="p">.</span><span class="n">data</span><span class="p">(),</span> <span class="n">v</span><span class="p">.</span><span class="n">file</span><span class="p">,</span> <span class="n">v</span><span class="p">.</span><span class="n">lineno</span><span class="p">);</span>
+
+    <span class="c1">// Return as atomically reference counted string
+</span><span class="c1"></span>    <span class="k">return</span> <span class="n">_base</span><span class="o">::</span><span class="n">atomic_refcounted_string_ref</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">length</span><span class="p">);</span>
+  <span class="p">}</span>
+<span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/experimental_status_code.cpp#L112" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/string_ref.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/source.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/worked-example-long/preamble.html b/doc/html/experimental/worked-example-long/preamble.html
new file mode 100644
index 000000000..1bc2b5006
--- /dev/null
+++ b/doc/html/experimental/worked-example-long/preamble.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Define a custom code domain - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/value_type.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Define a custom code domain</h1></div></div></div>
+  <p>Firstly let&rsquo;s alias the experimental Outcome namespace into something
+less tedious to type, declare our custom status code type, and get
+started on defining the custom status code domain implementation.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">outcome_e</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">experimental</span><span class="p">;</span>
+
+<span class="c1">// To define a `file_io_error` which participates in the P1028 world
+</span><span class="c1">// of `std::error`, we must first declare, then define, a custom code
+</span><span class="c1">// domain which extends `posix_code` (the std error coding for POSIX
+</span><span class="c1">// failures). The following is fairly standard boilerplate for defining
+</span><span class="c1">// a custom code domain. It is analogous to defining a custom `std::error_category`.
+</span><span class="c1"></span>
+<span class="k">class</span><span class="err"> </span><span class="nc">_file_io_error_domain</span><span class="p">;</span>
+<span class="c1">// We define `file_io_error` to be the status code whose domain is `_file_io_error_domain`.
+</span><span class="c1"></span><span class="k">using</span> <span class="n">file_io_error</span> <span class="o">=</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">status_code</span><span class="o">&lt;</span><span class="n">_file_io_error_domain</span><span class="o">&gt;</span><span class="p">;</span>
+
+<span class="c1">// Now we define `_file_io_error_domain`.
+</span><span class="c1"></span><span class="k">class</span><span class="err"> </span><span class="nc">_file_io_error_domain</span> <span class="o">:</span> <span class="k">public</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">posix_code</span><span class="o">::</span><span class="n">domain_type</span>
+<span class="p">{</span>
+  <span class="k">using</span> <span class="n">_base</span> <span class="o">=</span> <span class="k">typename</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">posix_code</span><span class="o">::</span><span class="n">domain_type</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/experimental_status_code.cpp#L66" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Note that we inherit from <code>outcome_e::posix_code::domain_type</code>, not
+from <code>outcome_e::status_code_domain</code>. We thus reuse most of the
+implementation of <code>outcome_e::posix_code::domain_type</code> rather than
+implementing required functionality. If you would like to see a
+fuller treatment of defining a custom status code domain from
+scratch, see <a href="https://github.com/ned14/status-code/blob/master/doc/custom_domain_worked_example.md">this worked example here</a>.</p>
+
+<p><a href="https://ned14.github.io/status-code/doc_status_code_domain.html#standardese-system_error2__status_code_domain">You may find looking at the API reference documentation for <code>status_code_domain</code>
+useful in the next few pages </a>.</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/value_type.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/worked-example-long/source.html b/doc/html/experimental/worked-example-long/source.html
new file mode 100644
index 000000000..b56dae017
--- /dev/null
+++ b/doc/html/experimental/worked-example-long/source.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Constexpr domain source - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/message.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/implicit_conversion.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Constexpr domain source</h1></div></div></div>
+  <p>Back in <a href="../../experimental/worked-example-long/constructor.html">The constructor</a>, we
+declared but did not implement a <code>.get()</code> function which returns a constexpr static
+instance of the domain. We implement this now:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// 100% constexpr instantiation
+</span><span class="c1"></span><span class="k">constexpr</span> <span class="n">_file_io_error_domain</span> <span class="n">file_io_error_domain</span><span class="p">;</span>
+<span class="kr">inline</span> <span class="k">constexpr</span> <span class="k">const</span> <span class="n">_file_io_error_domain</span> <span class="o">&amp;</span><span class="n">_file_io_error_domain</span><span class="o">::</span><span class="n">get</span><span class="p">()</span>
+<span class="p">{</span>
+  <span class="k">return</span> <span class="n">file_io_error_domain</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/experimental_status_code.cpp#L143" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>As this is 100% constexpr, it can be (and is under optimisation) implemented entirely
+in the mind of the compiler with no run time representation.</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/message.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/implicit_conversion.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/worked-example-long/string_ref.html b/doc/html/experimental/worked-example-long/string_ref.html
new file mode 100644
index 000000000..e38bcca4d
--- /dev/null
+++ b/doc/html/experimental/worked-example-long/string_ref.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>String refs - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/constructor.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/message.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">String refs</h1></div></div></div>
+  <p><code>&lt;system_error2&gt;</code> does not use <code>std::string</code> to return possibly statically
+or dynamically allocated strings, and thus avoids dragging in a lot of the
+standard library which impacts build times.</p>
+
+<p>Instead status code domains have a <a href="https://ned14.github.io/status-code/doc_status_code_domain.html#standardese-system_error2__status_code_domain__string_ref"><code>string_ref</code></a>,
+which has a polymorphic implementation which may or may not <a href="https://ned14.github.io/status-code/doc_status_code_domain.html#standardese-system_error2__status_code_domain__atomic_refcounted_string_ref">manage a dynamic
+memory allocation using an atomic reference counter</a>. Due to this polymorphism, you don&rsquo;t
+need to worry which implementation is actually in use under the bonnet
+when you pass around <code>string_ref</code> instances.</p>
+
+<p><code>string_ref</code> provides the same member functions as a <code>span&lt;const char&gt;</code>,
+and so participates ordinarily in STL algorithms and containers. In
+particular, if you need to string search or slice it, you can construct a
+<code>string_view</code> on top easily.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// Return the name of our custom code domain
+</span><span class="c1"></span>  <span class="k">virtual</span> <span class="n">_base</span><span class="o">::</span><span class="n">string_ref</span> <span class="n">name</span><span class="p">()</span> <span class="k">const</span> <span class="k">noexcept</span> <span class="k">override</span> <span class="k">final</span>  <span class="c1">// NOLINT
+</span><span class="c1"></span>  <span class="p">{</span>
+    <span class="k">static</span> <span class="n">string_ref</span> <span class="n">v</span><span class="p">(</span><span class="s">&#34;file i/o error domain&#34;</span><span class="p">);</span>
+    <span class="k">return</span> <span class="n">v</span><span class="p">;</span>  <span class="c1">// NOLINT
+</span><span class="c1"></span>  <span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/experimental_status_code.cpp#L104" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Now you understand what <code>string_ref</code> does, returning the name of the
+status code domain is self describing. Note we use the non-managing
+constructor of <code>string_ref</code>, as the string <code>&quot;file i/o error domain&quot;</code>
+is statically stored. We cache the returned value locally in static
+storage.</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/constructor.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/message.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/worked-example-long/value_type.html b/doc/html/experimental/worked-example-long/value_type.html
new file mode 100644
index 000000000..7f9857447
--- /dev/null
+++ b/doc/html/experimental/worked-example-long/value_type.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>The payload - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/preamble.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/constructor.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">The payload</h1></div></div></div>
+  <p>We define the code domain&rsquo;s <code>value_type</code> &ndash; the payload to be transported by
+status codes using this code domain &ndash; to be a POSIX <code>errno</code> value, an integer
+line number and a const char pointer.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">public</span><span class="o">:</span>
+  <span class="c1">// This is the value type for `file_io_error`. We add line number and source file path.
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="n">value_type</span>
+  <span class="p">{</span>
+    <span class="k">typename</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">posix_code</span><span class="o">::</span><span class="n">value_type</span> <span class="n">errcode</span><span class="p">;</span>  <span class="c1">// from POSIX, as we inherit from _posix_code_domain
+</span><span class="c1"></span>
+    <span class="c1">// Our additional payload
+</span><span class="c1"></span>    <span class="kt">int</span> <span class="n">lineno</span><span class="p">;</span>        <span class="c1">// from __LINE__
+</span><span class="c1"></span>    <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">file</span><span class="p">;</span>  <span class="c1">// from __FILE__
+</span><span class="c1"></span>    <span class="c1">// Could also place a backtrace of void *[16] here ...
+</span><span class="c1"></span>  <span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/experimental_status_code.cpp#L84" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>You will note that this is a <code>TriviallyCopyable</code> type, and so gains an implicit
+conversion to any <code>status_code&lt;erased&lt;T&gt;&gt;</code> where <code>sizeof(T) &gt;= sizeof(value_type)</code>.</p>
+
+<p><code>error</code> is however <code>status_code&lt;erased&lt;intptr_t&gt;&gt;</code>, and <code>sizeof(intptr_t) &lt; sizeof(value_type)</code>,
+so it is not possible to implicitly convert status codes from this domain into
+<code>error</code>. Instead, you must tell the compiler how to do the conversion, as we
+shall see later.</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example-long/preamble.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example-long.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long/constructor.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/experimental/worked-example.html b/doc/html/experimental/worked-example.html
new file mode 100644
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Worked example: Custom domain (the short way) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../experimental/outcome.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">Worked example: Custom domain (the short way)</h1></div></div></div>
+<p>The section after this one will take the long way through defining a custom domain
+which sometimes is necessary if you have particularly bespoke requirements.
+If however you just want to wrap a custom <code>enum</code> type of yours into its
+own custom code domain, the boilerplate can be automated away
+by filling in a few simple fields like this:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// My custom enum type
+</span><span class="c1"></span><span class="k">enum</span> <span class="k">class</span><span class="err"> </span><span class="nc">custom_failure</span>
+<span class="p">{</span>
+  <span class="n">not_found</span><span class="p">,</span>
+  <span class="n">bad_argument</span>
+<span class="p">};</span>
+
+<span class="c1">// Tell `status_code` to stamp out a custom code domain for this enum type
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN</span>
+<span class="k">template</span> <span class="o">&lt;&gt;</span> <span class="k">struct</span> <span class="n">quick_status_code_from_enum</span><span class="o">&lt;</span><span class="n">custom_failure</span><span class="o">&gt;</span> <span class="o">:</span> <span class="n">quick_status_code_from_enum_defaults</span><span class="o">&lt;</span><span class="n">custom_failure</span><span class="o">&gt;</span>
+<span class="p">{</span>
+  <span class="c1">// Text name of the enum
+</span><span class="c1"></span>  <span class="k">static</span> <span class="k">constexpr</span> <span class="k">const</span> <span class="k">auto</span> <span class="n">domain_name</span> <span class="o">=</span> <span class="s">&#34;My custom failure&#34;</span><span class="p">;</span>
+  <span class="c1">// Unique UUID for the enum. PLEASE use https://www.random.org/cgi-bin/randbyte?nbytes=16&amp;format=h
+</span><span class="c1"></span>  <span class="k">static</span> <span class="k">constexpr</span> <span class="k">const</span> <span class="k">auto</span> <span class="n">domain_uuid</span> <span class="o">=</span> <span class="s">&#34;{be201f65-3962-dd0e-1266-a72e63776a42}&#34;</span><span class="p">;</span>
+  <span class="c1">// Map of each enum value to its text string, and list of semantically equivalent errc&#39;s
+</span><span class="c1"></span>  <span class="k">static</span> <span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">initializer_list</span><span class="o">&lt;</span><span class="n">mapping</span><span class="o">&gt;</span> <span class="o">&amp;</span><span class="n">value_mappings</span><span class="p">()</span>
+  <span class="p">{</span>
+    <span class="k">static</span> <span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">initializer_list</span><span class="o">&lt;</span><span class="n">mapping</span><span class="o">&gt;</span> <span class="n">v</span> <span class="o">=</span> <span class="p">{</span>
+    <span class="c1">// Format is: { enum value, &#34;string representation&#34;, { list of errc mappings ... } }
+</span><span class="c1"></span>    <span class="p">{</span><span class="n">custom_failure</span><span class="o">::</span><span class="n">not_found</span><span class="p">,</span> <span class="s">&#34;item not found&#34;</span><span class="p">,</span> <span class="p">{</span><span class="n">errc</span><span class="o">::</span><span class="n">no_such_file_or_directory</span><span class="p">}},</span>  <span class="c1">//
+</span><span class="c1"></span>    <span class="p">{</span><span class="n">custom_failure</span><span class="o">::</span><span class="n">bad_argument</span><span class="p">,</span> <span class="s">&#34;invoked wrong&#34;</span><span class="p">,</span> <span class="p">{</span><span class="n">errc</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">}},</span>         <span class="c1">//
+</span><span class="c1"></span>    <span class="p">};</span>
+    <span class="k">return</span> <span class="n">v</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="c1">// Completely optional definition of mixin for the status code synthesised from `Enum`. It can be omitted.
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">Base</span><span class="o">&gt;</span> <span class="k">struct</span> <span class="nl">mixin</span> <span class="p">:</span> <span class="n">Base</span>
+  <span class="p">{</span>
+    <span class="k">using</span> <span class="n">Base</span><span class="o">::</span><span class="n">Base</span><span class="p">;</span>
+    <span class="k">constexpr</span> <span class="kt">int</span> <span class="nf">custom_method</span><span class="p">()</span> <span class="k">const</span> <span class="p">{</span> <span class="k">return</span> <span class="mi">42</span><span class="p">;</span> <span class="p">}</span>
+  <span class="p">};</span>
+<span class="p">};</span>
+<span class="n">BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/quick_status_code_from_enum.cpp#L37" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Here we supply the bare minimum requirements for a status code domain:</p>
+
+<ol>
+<li>The name in text, so it can be printed.</li>
+<li>The unique UUID to identify when multiple copies of the domain are the same.
+PLEASE use <a href="https://www.random.org/cgi-bin/randbyte?nbytes=16&amp;format=h">https://www.random.org/cgi-bin/randbyte?nbytes=16&amp;format=h</a> to generate
+this, do not twiddle a few bits.</li>
+<li>For each enum value, its printable text and a sequence of <code>errc::</code> enumerations
+which you think it is semantically equivalent to i.e. its mapping onto <code>generic_code</code>
+which is how status code defines the common mapping between status codes. If you later compare the
+status code to one of those values (or to another status code which also provides
+a mapping), if the generic codes are equivalent then the comparison will return true.
+This means code like <code>if(sc == errc::no_such_file_or_directory) ...</code> would match
+all custom error codes which mean &lsquo;something was not found&rsquo;.</li>
+<li>OPTIONAL: if you would like the custom status code type generated by this
+to have additional member functions or additional payload, you can define a mixin
+here to inject either data or functions or both. If you omit this, nothing gets
+injected.</li>
+</ol>
+
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../experimental/outcome.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../experimental.html"><img src="../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/experimental/worked-example/implicit-construction.html b/doc/html/experimental/worked-example/implicit-construction.html
new file mode 100644
index 000000000..efa3bfb72
--- /dev/null
+++ b/doc/html/experimental/worked-example/implicit-construction.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Implicit construction - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../experimental/worked-example-long.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Implicit construction</h1></div></div></div>
+  <p>The preceding code had the compiler stamp out a custom status code domain
+for a user supplied <code>enum</code>. You now get the following types:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// This is the status code generated for your custom enum type. It will implicitly construct from
+</span><span class="c1">// values of enum custom_failure.
+</span><span class="c1"></span><span class="k">using</span> <span class="n">custom_failure_code</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE</span><span class="o">::</span><span class="n">quick_status_code_from_enum_code</span><span class="o">&lt;</span><span class="n">custom_failure</span><span class="o">&gt;</span><span class="p">;</span>
+
+<span class="k">namespace</span> <span class="n">outcome_e</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">experimental</span><span class="p">;</span>
+
+<span class="c1">// You don&#39;t usually need to use the status code type explicitly, because this &#34;just works&#34;:
+</span><span class="c1"></span><span class="n">outcome_e</span><span class="o">::</span><span class="n">status_result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">positive_only</span><span class="p">(</span><span class="kt">int</span> <span class="n">x</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">if</span><span class="p">(</span><span class="n">x</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="c1">// Outcome&#39;s result sees that status_code will implicitly construct from this enum,
+</span><span class="c1"></span>    <span class="c1">// and it returns an errored result
+</span><span class="c1"></span>    <span class="k">return</span> <span class="n">custom_failure</span><span class="o">::</span><span class="n">bad_argument</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="k">return</span> <span class="n">x</span><span class="p">;</span>
+<span class="p">}</span>
+
+<span class="c1">// Semantic comparisons work
+</span><span class="c1"></span><span class="kt">bool</span> <span class="n">test</span><span class="p">(</span><span class="kt">int</span> <span class="n">x</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">if</span><span class="p">(</span><span class="k">auto</span> <span class="n">r</span> <span class="o">=</span> <span class="n">positive_only</span><span class="p">(</span><span class="n">x</span><span class="p">);</span> <span class="o">!</span><span class="n">r</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="k">if</span><span class="p">(</span><span class="n">r</span><span class="p">.</span><span class="n">error</span><span class="p">()</span> <span class="o">==</span> <span class="n">outcome_e</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Positive numbers only!&#34;</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+      <span class="k">return</span> <span class="nb">false</span><span class="p">;</span>
+    <span class="p">}</span>
+  <span class="p">}</span>
+  <span class="k">return</span> <span class="nb">true</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/quick_status_code_from_enum.cpp#L73" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>As you can see, this is less work than <a href="../../motivation/plug_error_code.html">plugging your custom enum
+into <code>std::error_code</code></a>.
+It also has C compatibility, and generates better codegen.</p>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../experimental/worked-example.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../experimental/worked-example.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/faq.html b/doc/html/faq.html
new file mode 100644
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+++ b/doc/html/faq.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Frequently asked questions - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="./reference/functions/try_throw_std_exception_from_error.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">Frequently asked questions</h1></div></div></div>
+  <div class="toc"><dl class="toc">
+<dt>
+<dd><dl>
+<dt><a href="#is-outcome-safe-to-use-in-extern-apis">Is Outcome safe to use in extern APIs?</a></dt>
+<dt><a href="#does-outcome-implement-over-alignment">Does Outcome implement over-alignment?</a></dt>
+<dt><a href="#does-outcome-implement-the-no-fail-strong-or-basic-exception-guarantee">Does Outcome implement the no-fail, strong or basic exception guarantee?</a></dt>
+<dt><a href="#does-outcome-have-a-stable-abi-and-api">Does Outcome have a stable ABI and API?</a></dt>
+<dt><a href="#can-i-use-result-t-ec-across-dll-shared-object-boundaries">Can I use <code>result&lt;T, EC&gt;</code> across DLL/shared object boundaries?</a></dt>
+<dt><a href="#why-two-types-result-and-outcome-rather-than-just-one">Why two types <code>result&lt;&gt;</code>  and <code>outcome&lt;&gt;</code>, rather than just one?</a></dt>
+<dt><a href="#how-badly-will-including-outcome-in-my-public-interface-affect-compile-times">How badly will including Outcome in my public interface affect compile times?</a></dt>
+<dt><a href="#is-outcome-suitable-for-fixed-latency-predictable-execution-coding-such-as-for-high-frequency-trading-or-audio">Is Outcome suitable for fixed latency/predictable execution coding such as for high frequency trading or audio?</a></dt>
+<dt><a href="#what-kind-of-runtime-performance-impact-will-using-outcome-in-my-code-introduce">What kind of runtime performance impact will using Outcome in my code introduce?</a>
+<dd><dl>
+<dt><a href="#high-end-cpu-intel-skylake-x64">High end CPU: Intel Skylake x64</a></dt>
+<dt><a href="#mid-tier-cpu-arm-cortex-a72">Mid tier CPU: ARM Cortex A72</a></dt>
+<dt><a href="#low-end-cpus-intel-silvermont-x64-and-arm-cortex-a53">Low end CPUs: Intel Silvermont x64 and ARM Cortex A53</a></dt>
+</dl></dd></dt>
+<dt><a href="#why-is-implicit-default-construction-disabled">Why is implicit default construction disabled?</a></dt>
+<dt><a href="#how-far-away-from-the-proposed-std-expected-t-e-is-outcome-s-checked-t-e">How far away from the proposed <code>std::expected&lt;T, E&gt;</code> is Outcome&rsquo;s <code>checked&lt;T, E&gt;</code>?</a></dt>
+<dt><a href="#why-doesn-t-outcome-duplicate-std-expected-t-e-s-design">Why doesn&rsquo;t Outcome duplicate <code>std::expected&lt;T, E&gt;</code>&rsquo;s design?</a></dt>
+<dt><a href="#is-outcome-riddled-with-undefined-behaviour-for-const-const-containing-and-reference-containing-types">Is Outcome riddled with undefined behaviour for const, const-containing and reference-containing types?</a>
+<dd><dl>
+<dt><a href="#more-detail">More detail</a></dt>
+</dl></dd></dt>
+</dl></dd></dt>
+</dl>
+  </div>
+
+
+
+
+<h2 id="is-outcome-safe-to-use-in-extern-apis">Is Outcome safe to use in extern APIs?</h2>
+
+<p>Outcome is specifically designed for use in the public interfaces of multi-million
+line codebases. <code>result</code>&rsquo;s layout is hard coded to:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">struct</span> <span class="n">trivially_copyable_result_layout</span> <span class="p">{</span>
+  <span class="k">union</span> <span class="p">{</span>
+    <span class="n">value_type</span> <span class="n">value</span><span class="p">;</span>
+    <span class="n">error_type</span> <span class="n">error</span><span class="p">;</span>
+  <span class="p">};</span>
+  <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+<span class="p">};</span>
+</code></pre></div>
+<p>&hellip; if both <code>value_type</code> and <code>error_type</code> are <code>TriviallyCopyable</code>, otherwise:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">struct</span> <span class="n">non_trivially_copyable_result_layout</span> <span class="p">{</span>
+  <span class="n">value_type</span> <span class="n">value</span><span class="p">;</span>
+  <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+  <span class="n">error_type</span> <span class="n">error</span><span class="p">;</span>
+<span class="p">};</span>
+</code></pre></div>
+<p>This is C-compatible if <code>value_type</code> and <code>error_type</code> are C-compatible. 
+<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code</code></a>
+
+is <em>probably</em> C-compatible, but its layout is not standardised (though there is a
+normative note in the standard about its layout). Hence Outcome cannot provide a
+C macro API for standard Outcome, but we can for <a href="./experimental/c-api.html">Experimental Outcome</a>.</p>
+
+<h2 id="does-outcome-implement-over-alignment">Does Outcome implement over-alignment?</h2>
+
+<p>Outcome propagates any over-alignment of the types you supply to it as according
+to the layout specified above. Therefore the ordinary alignment and padding rules
+for your compiler are used.</p>
+
+<h2 id="does-outcome-implement-the-no-fail-strong-or-basic-exception-guarantee">Does Outcome implement the no-fail, strong or basic exception guarantee?</h2>
+
+<p>(<a href="https://en.cppreference.com/w/cpp/language/exceptions#Exception_safety">You can read about the meaning of these guarantees at cppreference.com</a>)</p>
+
+<p>If for the following operations:</p>
+
+<ul>
+<li>Construction</li>
+<li>Assignment</li>
+<li>Swap</li>
+</ul>
+
+<p>&hellip; the corresponding operation in <strong>all</strong> of <code>value_type</code>, <code>error_type</code> (and
+<code>exception_type</code> for <code>outcome</code>) is <code>noexcept(true)</code>, then <code>result</code> and
+<code>outcome</code>&rsquo;s operation is <code>noexcept(true)</code>. This propagates the no-fail exception
+guarantee of the underlying types. Otherwise the basic guarantee applies for all
+but Swap, under the same rules as for the <code>struct</code> layout type given above e.g.
+value would be constructed first, then the flags, then the error. If the error
+throws, value and status bits would be as if the failure had not occurred, same
+as for aborting the construction of any <code>struct</code> type.</p>
+
+<p>It is recognised that these weak guarantees may be unsuitable for some people,
+so Outcome implements <code>swap()</code> with much stronger guarantees, as one can locally refine,
+without too much work, one&rsquo;s own custom classes from <code>result</code> and <code>outcome</code> implementing
+stronger guarantees for construction and assignment using <code>swap()</code> as the primitive
+building block.</p>
+
+<p>The core ADL discovered implementation of strong guarantee swap is <a href="./reference/functions/strong_swap.html" class="api-reference"><code>strong_swap(bool &amp;all_good, T &amp;a, T &amp;b)</code></a>
+.
+This can be overloaded by third party code with custom strong guarantee swap
+implementations, same as for <code>std::swap()</code>. Because strong guarantee swap may fail
+when trying to restore input state during handling of failure to swap, the
+<code>all_good</code> boolean becomes false if restoration fails, at which point both
+results/outcomes get marked as tainted via <a href="./reference/types/basic_result/has_lost_consistency.html" class="api-reference"><code>has_lost_consistency()</code></a>
+.</p>
+
+<p>It is <strong>up to you</strong> to check this flag to see if known good state has been lost,
+as Outcome never does so on your behalf. The simple solution to avoiding having
+to deal with this situation is to always choose your value, error and exception
+types to have non-throwing move constructors and move assignments. This causes
+the strong swap implementation to no longer be used, as it is no longer required,
+and standard swap is used instead.</p>
+
+<h2 id="does-outcome-have-a-stable-abi-and-api">Does Outcome have a stable ABI and API?</h2>
+
+<p>The layout changed for all trivially copyable types between Outcome v2.1 and v2.2,
+as union based storage was introduced. From v2.2 onwards, the layout is not
+expected to change again.</p>
+
+<p>If v2.2 proves to be unchanging for 24 months, Outcome&rsquo;s ABI and API will be
+formally fixed as <strong>the</strong> v2 interface and written into stone forever. Thereafter
+the <a href="https://lvc.github.io/abi-compliance-checker/">ABI compliance checker</a>
+will be run per-commit to ensure Outcome&rsquo;s ABI and API remains stable. This is
+currently expected to occur in 2022.</p>
+
+<p>Note that the stable ABI and API guarantee will only apply to standalone
+Outcome, not to Boost.Outcome. Boost.Outcome has dependencies on other
+parts of Boost which are not stable across releases.</p>
+
+<p>Note also that the types you configure a <code>result</code> or <code>outcome</code> with also need
+to be ABI stable if <code>result</code> or <code>outcome</code> is to be ABI stable.</p>
+
+<h2 id="can-i-use-result-t-ec-across-dll-shared-object-boundaries">Can I use <code>result&lt;T, EC&gt;</code> across DLL/shared object boundaries?</h2>
+
+<p>A known problem with using Windows DLLs (and to smaller extent POSIX shared libraries) is that global
+objects may get duplicated: one instance in the executable and one in the DLL. This
+behaviour is not incorrect according to the C++ Standard, as the Standard does not
+recognize the existence of DLLs or shared libraries. Therefore, program designs that
+depend on globals having unique addresses may become compromised when used in a program
+using DLLs.</p>
+
+<p>Nothing in Outcome depends on the addresses of globals, plus the guaranteed fixed data
+layout (see answer above) means that different versions of Outcome can be used in
+different DLLs, and it probably will work okay (it is still not advised that you do that
+as that is an ODR violation).
+However, one of the most likely candidate for <code>EC</code> &ndash; <code>std::error_code</code> &ndash; <strong>does</strong> depend
+on the addresses of globals for correct functioning.</p>
+
+<p>The standard library is required to implement globally unique addresses for the standard library
+provided 
+<a href="https://en.cppreference.com/w/cpp/error/error_category" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_category</code></a>
+ implementations e.g. <code>std::system_category()</code>.
+User defined error code categories may <strong>not</strong> have unique global addresses, and thus
+introduce misoperation.</p>
+
+<p><code>boost::system::error_code</code>, since version 1.69 does offer an <em>opt-in</em> guarantee
+that it does not depend on the addresses of globals <strong>if</strong> the user defined error code
+category <em>opts-in</em> to the 64-bit comparison mechanism. This can be seen in the specification of
+<code>error_category::operator==</code> in
+<a href="https://www.boost.org/doc/libs/1_69_0/libs/system/doc/html/system.html#ref_synopsis">Boost.System synopsis</a>.</p>
+
+<p>Alternatively, the <code>status_code</code> in <a href="(/experimental/differences.html)">Experimental Outcome</a>,
+due to its more modern design, does not suffer from any problems from being used in shared
+libraries in any configuration.</p>
+
+<h2 id="why-two-types-result-and-outcome-rather-than-just-one">Why two types <code>result&lt;&gt;</code>  and <code>outcome&lt;&gt;</code>, rather than just one?</h2>
+
+<p><code>result</code> is the simple, success OR failure type.</p>
+
+<p><code>outcome</code> extends <code>result</code> with a third state to transport, conventionally (but not necessarily) some sort of &ldquo;abort&rdquo; or &ldquo;exceptional&rdquo; state which a function can return to indicate that not only did the operation fail, but it did so <em>catastrophically</em> i.e. please abort any attempt to retry the operation.</p>
+
+<p>A perfect alternative to using <code>outcome</code> is to throw a C++ exception for the abort code path, and indeed most programs ought to do exactly that instead of using <code>outcome</code>. However there are a number of use cases where choosing <code>outcome</code> shines:</p>
+
+<ol>
+<li>Where C++ exceptions or RTTI is not available, but the ability to fail catastrophically without terminating the program is important.</li>
+<li>Where deterministic behaviour is required even in the catastrophic failure situation.</li>
+<li>In unit test suites of code using Outcome it is extremely convenient to accumulate test failures into an <code>outcome</code> for later reporting. A similar convenience applies to RPC situations, where C++ exception throws need to be accumulated for reporting back to the initiating endpoint.</li>
+<li>Where a function is &ldquo;dual use deterministic&rdquo; i.e. it can be used deterministically, in which case one switches control flow based on <code>.error()</code>, or it can be used non-deterministically by throwing an exception perhaps carrying a custom payload.</li>
+</ol>
+
+<h2 id="how-badly-will-including-outcome-in-my-public-interface-affect-compile-times">How badly will including Outcome in my public interface affect compile times?</h2>
+
+<p>The quick answer is that it depends on how much convenience you want.</p>
+
+<p>The convenience header <code>&lt;result.hpp&gt;</code> is dependent on <code>&lt;system_error&gt;</code> or Boost.System, which unfortunately includes <code>&lt;string&gt;</code> and thus
+drags in quite a lot of other slow-to-parse stuff. If your public interface already includes <code>&lt;string&gt;</code>,
+then the impact of additionally including Outcome will be low. If you do not include <code>&lt;string&gt;</code>,
+unfortunately impact may be relatively quite high, depending on the total impact of your
+public interface files.</p>
+
+<p>If you&rsquo;ve been extremely careful to avoid ever including the most of the STL headers
+into your interfaces in order to maximise build performance, then <code>&lt;basic_result.hpp&gt;</code>
+can have as few dependencies as:</p>
+
+<ol>
+<li><code>&lt;cstdint&gt;</code></li>
+<li><code>&lt;initializer_list&gt;</code></li>
+<li><code>&lt;iosfwd&gt;</code></li>
+<li><code>&lt;new&gt;</code></li>
+<li><code>&lt;type_traits&gt;</code></li>
+<li><code>&lt;cstdio&gt;</code></li>
+<li><code>&lt;cstdlib&gt;</code></li>
+<li><code>&lt;cassert&gt;</code></li>
+</ol>
+
+<p>These, apart from <code>&lt;iosfwd&gt;</code>, tend to be very low build time impact in most standard
+library implementations. If you include only <code>&lt;basic_result.hpp&gt;</code>, and manually configure
+<code>basic_result&lt;&gt;</code> by hand, compile time impact will be minimised.</p>
+
+<p>(See reference documentation for <a href="./reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ for more detail.</p>
+
+<h2 id="is-outcome-suitable-for-fixed-latency-predictable-execution-coding-such-as-for-high-frequency-trading-or-audio">Is Outcome suitable for fixed latency/predictable execution coding such as for high frequency trading or audio?</h2>
+
+<p>Great care has been taken to ensure that Outcome never unexpectedly executes anything
+with unbounded execution times such as <code>malloc()</code>, <code>dynamic_cast&lt;&gt;()</code> or <code>throw</code>.
+Outcome works perfectly with C++ exceptions and RTTI globally disabled.</p>
+
+<p>Outcome&rsquo;s entire design premise is that its users are happy to exchange a small, predictable constant overhead
+during successful code paths, in exchange for predictable failure code paths.</p>
+
+<p>In contrast, table-based exception handling gives zero run time overhead for the
+successful code path, and completely unpredictable (and very expensive) overhead
+for failure code paths.</p>
+
+<p>For code where predictability of execution, no matter the code path, is paramount,
+writing all your code to use Outcome is not a bad place to start. Obviously enough,
+do choose a non-throwing policy when configuring <code>outcome</code> or <code>result</code> such as
+<a href="./reference/policies/all_narrow.html" class="api-reference"><code>all_narrow</code></a>
+ to guarantee that exceptions can never be thrown by Outcome
+(or use the convenience typedef for <code>result</code>, <a href="./reference/aliases/unchecked.html" class="api-reference"><code>unchecked&lt;T, E = varies&gt;</code></a>
+ which uses <code>policy::all_narrow</code>).</p>
+
+<h2 id="what-kind-of-runtime-performance-impact-will-using-outcome-in-my-code-introduce">What kind of runtime performance impact will using Outcome in my code introduce?</h2>
+
+<p>It is very hard to say anything definitive about performance impacts in codebases one
+has never seen. Each codebase is unique. However to come up with some form of measure,
+we timed traversing ten stack frames via each of the main mechanisms, including the
+&ldquo;do nothing&rdquo; (null) case.</p>
+
+<p>A stack frame is defined to be something called by the compiler whilst
+unwinding the stack between the point of return in the ultimate callee and the base
+caller, so for example ten stack allocated objects might be destructed, or ten levels
+of stack depth might be unwound. This is not a particularly realistic test, but it
+should at least give one an idea of the performance impact of returning Outcome&rsquo;s
+<code>result</code> or <code>outcome</code> over say returning a plain integer, or throwing an exception.</p>
+
+<p>The following figures are for Outcome v2.1.0 with GCC 7.4, clang 8.0 and Visual
+Studio 2017.9. Figures for newer Outcomes with newer compilers can be found at
+<a href="https://github.com/ned14/outcome/tree/develop/benchmark">https://github.com/ned14/outcome/tree/develop/benchmark</a>.</p>
+
+<h3 id="high-end-cpu-intel-skylake-x64">High end CPU: Intel Skylake x64</h3>
+
+<p>This is a high end CPU with very significant ability to cache, predict, parallelise
+and execute out-of-order such that tight, repeated loops perform very well. It has
+a large μop cache able to wholly contain the test loop, meaning that these results
+are a <strong>best case</strong> performance.</p>
+
+<figure>
+    <img src="./faq/results_skylake_log.png"/> <figcaption>
+            <h4>Log graph comparing GCC 7.4, clang 8.0 and Visual Studio 2017.9 on x64, for exceptions-globally-disabled, ordinary and link-time-optimised build configurations.</h4>
+        </figcaption>
+</figure>
+
+<p>As you can see, throwing and catching an exception is
+expensive on table-based exception handling implementations such as these, anywhere
+between 26,000 and 43,000 CPU cycles. And this is the <em>hot path</em> situation, this
+benchmark is a loop around hot cached code. If the tables are paged out onto storage,
+you are talking about <strong>millions</strong> of CPU cycles.</p>
+
+<p>Simple integer returns (i.e. do nothing null case)
+are always going to be the fastest as they do the least work, and that costs 80 to 90
+CPU cycles on this Intel Skylake CPU.</p>
+
+<p>Note that returning a <code>result&lt;int, std::error_code&gt;</code> with a &ldquo;success (error code)&rdquo;
+is no more than 5% added runtime overhead over returning a naked int on GCC and clang. On MSVC
+it costs an extra 20% or so, mainly due to poor code optimisation in the VS2017.9 compiler. Note that &ldquo;success
+(experimental status code)&rdquo; optimises much better, and has almost no overhead over a
+naked int.</p>
+
+<p>Returning a <code>result&lt;int, std::error_code&gt;</code> with a &ldquo;failure (error code)&rdquo;
+is less than 5% runtime overhead over returning a success on GCC, clang and MSVC.</p>
+
+<p>You might wonder what happens if type <code>E</code> has a non-trivial destructor, thus making the
+<code>result&lt;T, E&gt;</code> have a non-trivial destructor? We tested <code>E = std::exception_ptr</code> and
+found less than a 5% overhead to <code>E = std::error_code</code> for returning success. Returning a failure
+was obviously much slower at anywhere between 300 and 1,100 CPU cycles, due to the
+dynamic memory allocation and free of the exception ptr, plus at least two atomic operations per stack frame, but that is
+still two orders of magnitude better than throwing and catching an exception.</p>
+
+<p>We conclude that if failure is anything but extremely rare in your C++ codebase,
+using Outcome instead of throwing and catching exceptions ought to be quicker overall:</p>
+
+<ul>
+<li>Experimental Outcome is statistically indistinguishable from the null case on this
+high end CPU, for both returning success and failure, on all compilers.</li>
+<li>Standard Outcome is less than 5%
+worse than the null case for returning successes on GCC and clang, and less than 10% worse than
+the null case for returning failures on GCC and clang.</li>
+<li>Standard Outcome optimises
+poorly on VS2017.9, indeed markedly worse than on previous point releases, so let&rsquo;s
+hope that Microsoft fix that soon. It currently has a less than 20% overhead on the null case.</li>
+</ul>
+
+<h3 id="mid-tier-cpu-arm-cortex-a72">Mid tier CPU: ARM Cortex A72</h3>
+
+<p>This is a four year old mid tier CPU used in many high end mobile phones and tablets
+of its day, with good ability to cache, predict, parallelise
+and execute out-of-order such that tight, repeated loops perform very well. It has
+a μop cache able to wholly contain the test loop, meaning that these results
+are a <strong>best case</strong> performance.</p>
+
+<figure>
+    <img src="./faq/results_arm_a72_log.png"/> <figcaption>
+            <h4>Log graph comparing GCC 7.3 and clang 7.3 on ARM64, for exceptions-globally-disabled, ordinary and link-time-optimised build configurations.</h4>
+        </figcaption>
+</figure>
+
+<p>This ARM chip is a very consistent performer &ndash; null case, success, or failure, all take
+almost exactly the same CPU cycles. Choosing Outcome, in any configuration, makes no
+difference to not using Outcome at all. Throwing and catching a C++ exception costs
+about 90,000 CPU cycles, whereas the null case/Outcome costs about 130 - 140 CPU cycles.</p>
+
+<p>There is very little to say about this CPU, other than Outcome is zero overhead on it. The same
+applied to the ARM Cortex A15 incidentally, which I test cased extensively when
+deciding on the Outcome v2 design back after the first peer review. The v2 design
+was chosen partially because of such consistent performance on ARM.</p>
+
+<h3 id="low-end-cpus-intel-silvermont-x64-and-arm-cortex-a53">Low end CPUs: Intel Silvermont x64 and ARM Cortex A53</h3>
+
+<p>These are low end CPUs with a mostly or wholly in-order execution core. They have a small
+or no μop cache, meaning that the CPU must always decode the instruction stream.
+These results represent an execution environment more typical of CPUs two decades
+ago, back when table-based EH created a big performance win if you never threw
+an exception.</p>
+
+<p><figure>
+    <img src="./faq/results_silvermont_log.png"/> <figcaption>
+            <h4>Log graph comparing GCC 7.3 and clang 7.3 on x64, for exceptions-globally-disabled, ordinary and link-time-optimised build configurations.</h4>
+        </figcaption>
+</figure>
+<figure>
+    <img src="./faq/results_arm_a53_log.png"/> <figcaption>
+            <h4>Log graph comparing GCC 7.3 and clang 7.3 on ARM64, for exceptions-globally-disabled, ordinary and link-time-optimised build configurations.</h4>
+        </figcaption>
+</figure></p>
+
+<p>The first thing to mention is that clang generates very high performance code for
+in-order cores, far better than GCC. It is said that this is due to a very large investment by
+Apple in clang/LLVM for their devices sustained over many years. In any case, if you&rsquo;re
+targeting in-order CPUs, don&rsquo;t use GCC if you can use clang instead!</p>
+
+<p>For the null case, Silvermont and Cortex A53 are quite similar in terms of CPU clock cycles. Ditto
+for throwing and catching a C++ exception (approx 150,000 CPU cycles). However the Cortex
+A53 does far better with Outcome than Silvermont, a 15% versus 100% overhead for Standard
+Outcome, and a 4% versus 20% overhead for Experimental Outcome.</p>
+
+<p>Much of this large difference is in fact due to calling convention differences. x64 permits up to 8 bytes
+to be returned from functions by CPU register. <code>result&lt;int&gt;</code> consumes 24 bytes, so on x64
+the compiler writes the return value to the stack. However ARM64 permits up to 64 bytes
+to be returned in registers, so <code>result&lt;int&gt;</code> is returned via CPU registers on ARM64.</p>
+
+<p>On higher end CPUs, memory is read and written in cache lines (32 or 64 bytes), and
+reads and writes are coalesced and batched together by the out-of-order execution core. On these
+low end CPUs, memory is read and written sequentially per assembler instruction,
+so only one load or one store to L1
+cache can occur at a time. This makes writing the stack particularly slow on in-order
+CPUs. Memory operations which &ldquo;disappear&rdquo; on higher end CPUs take considerable time
+on low end CPUs. This particularly punishes Silvermont in a way which does not punish
+the Cortex A53, because of having to write multiple values to the stack to create the
+24 byte object to be returned.</p>
+
+<p>The conclusion to take away from this is that if you are targeting a low end CPU,
+table-based EH still delivers significant performance improvements for the success
+code path. Unless determinism in failure is critically important, you should not
+use Outcome on in-order execution CPUs.</p>
+
+<h2 id="why-is-implicit-default-construction-disabled">Why is implicit default construction disabled?</h2>
+
+<p>This was one of the more interesting points of discussion during the peer review of
+Outcome v1. v1 had a formal empty state. This came with many advantages, but it
+was not felt to be STL idiomatic as <code>std::optional&lt;result&lt;T&gt;&gt;</code> is what was meant, so
+v2 has eliminated any legal possibility of being empty.</p>
+
+<p>The <code>expected&lt;T, E&gt;</code> proposal of that time (May 2017) did permit default construction
+if its <code>T</code> type allowed default construction. This was specifically done to make
+<code>expected&lt;T, E&gt;</code> more useful in STL containers as one can say resize a vector without
+having to supply an <code>expected&lt;T, E&gt;</code> instance to fill the new items with. However
+there was some unease with that design choice, because it may cause programmers to
+use some type <code>T</code> whose default constructed state is overloaded with additional meaning,
+typically &ldquo;to be filled&rdquo; i.e. a de facto empty state via choosing a magic value.</p>
+
+<p>For the v2 redesign, the various arguments during the v1 review were considered.
+Unlike <code>expected&lt;T, E&gt;</code> which is intended to be a general purpose Either monad
+vocabulary type, Outcome&rsquo;s types are meant primarily for returning success or failure
+from functions. The API should therefore encourage the programmer to not overload
+the successful type with additional meaning of &ldquo;to be filled&rdquo; e.g. <code>result&lt;std::optional&lt;T&gt;&gt;</code>.
+The decision was therefore taken to disable <em>implicit</em> default construction, but
+still permit <em>explicit</em> default construction by making the programmer spell out their
+intention with extra typing.</p>
+
+<p>To therefore explicitly default construct a <code>result&lt;T&gt;</code> or <code>outcome&lt;T&gt;</code>, use one
+of these forms as is the most appropriate for the use case:</p>
+
+<ol>
+<li>Construct with just <code>in_place_type&lt;T&gt;</code> e.g. <code>result&lt;T&gt;(in_place_type&lt;T&gt;)</code>.</li>
+<li>Construct via <code>success()</code> e.g. <code>outcome&lt;T&gt;(success())</code>.</li>
+<li>Construct from a <code>void</code> form e.g. <code>result&lt;T&gt;(result&lt;void&gt;(in_place_type&lt;void&gt;))</code>.</li>
+</ol>
+
+<h2 id="how-far-away-from-the-proposed-std-expected-t-e-is-outcome-s-checked-t-e">How far away from the proposed <code>std::expected&lt;T, E&gt;</code> is Outcome&rsquo;s <code>checked&lt;T, E&gt;</code>?</h2>
+
+<p>Not far, in fact after the first Boost.Outcome peer review in May 2017, Expected moved
+much closer to Outcome, and Outcome deliberately provides <a href="./reference/aliases/checked.html" class="api-reference"><code>checked&lt;T, E = varies&gt;</code></a>
+
+as a semantic equivalent.</p>
+
+<p>Here are the remaining differences which represent the
+divergence of consensus opinion between the Boost peer review and WG21 on the proper
+design for this object:</p>
+
+<ol>
+<li><code>checked&lt;T, E&gt;</code> has no default constructor. Expected has a default constructor if
+<code>T</code> has a default constructor.</li>
+<li><code>checked&lt;T, E&gt;</code> uses the same constructor design as <code>std::variant&lt;...&gt;</code>. Expected
+uses the constructor design of <code>std::optional&lt;T&gt;</code>.</li>
+<li><code>checked&lt;T, E&gt;</code> cannot be modified after construction except by assignment.
+Expected provides an <code>.emplace()</code> modifier.</li>
+<li><code>checked&lt;T, E&gt;</code> permits implicit construction from both <code>T</code> and <code>E</code> when
+unambiguous. Expected permits implicit construction from <code>T</code> alone.</li>
+<li><code>checked&lt;T, E&gt;</code> does not permit <code>T</code> and <code>E</code> to be the same, and becomes annoying
+to use if they are constructible into one another (implicit construction self-disables).
+Expected permits <code>T</code> and <code>E</code> to be the same.</li>
+<li><code>checked&lt;T, E&gt;</code> throws <code>bad_result_access_with&lt;E&gt;</code> instead of Expected&rsquo;s
+<code>bad_expected_access&lt;E&gt;</code>.</li>
+<li><code>checked&lt;T, E&gt;</code> models <code>std::variant&lt;...&gt;</code>. Expected models <code>std::optional&lt;T&gt;</code>. Thus:
+
+<ul>
+<li><code>checked&lt;T, E&gt;</code> does not provide <code>operator*()</code> nor <code>operator-&gt;</code></li>
+<li><code>checked&lt;T, E&gt;</code> <code>.error()</code> is wide (i.e. throws on no-value) like <code>.value()</code>.
+Expected&rsquo;s <code>.error()</code> is narrow (UB on no-error). [<code>checked&lt;T, E&gt;</code> provides
+<code>.assume_value()</code> and <code>.assume_error()</code> for narrow (UB causing) observers].</li>
+</ul></li>
+<li><code>checked&lt;T, E&gt;</code> uses <code>success&lt;T&gt;</code> and <code>failure&lt;E&gt;</code> type sugars for disambiguation.
+Expected uses <code>unexpected&lt;E&gt;</code> only.</li>
+<li><code>checked&lt;T, E&gt;</code> does not implement (prone to unintended misoperation) comparison
+operators which permit implicit conversion e.g. <code>checked&lt;T&gt; == T</code> will fail to compile.
+Instead write unambiguous code e.g. <code>checked&lt;T&gt; == success(T)</code> or <code>checked&lt;T&gt; == failure(T)</code>.</li>
+<li><code>checked&lt;T, E&gt;</code> defaults <code>E</code> to <code>std::error_code</code> or <code>boost::system::error_code</code>.
+Expected does not default <code>E</code>.</li>
+</ol>
+
+<p>In fact, the two are sufficiently close in design that a highly conforming <code>expected&lt;T, E&gt;</code>
+can be implemented by wrapping up <code>checked&lt;T, E&gt;</code> with the differing functionality:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="cm">/* Here is a fairly conforming implementation of P0323R3 `expected&lt;T, E&gt;` using `checked&lt;T, E&gt;`.
+</span><span class="cm">It passes the reference test suite for P0323R3 at
+</span><span class="cm">https://github.com/viboes/std-make/blob/master/test/expected/expected_pass.cpp with modifications
+</span><span class="cm">only to move the test much closer to the P0323R3 Expected, as the reference test suite is for a
+</span><span class="cm">much older proposed Expected.
+</span><span class="cm">
+</span><span class="cm">Known differences from P0323R3 in this implementation:
+</span><span class="cm">- `T` and `E` cannot be the same type.
+</span><span class="cm">- `E` must be default constructible.
+</span><span class="cm">- No variant storage is implemented (note the Expected proposal does not actually require this).
+</span><span class="cm">*/</span>
+
+<span class="k">namespace</span> <span class="n">detail</span>
+<span class="p">{</span>
+  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span> <span class="k">using</span> <span class="n">expected_result</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">checked</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;</span><span class="p">;</span>
+  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span> <span class="k">struct</span> <span class="nl">enable_default_constructor</span> <span class="p">:</span> <span class="k">public</span> <span class="n">expected_result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;</span>
+  <span class="p">{</span>
+    <span class="k">using</span> <span class="n">base</span> <span class="o">=</span> <span class="n">expected_result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;</span><span class="p">;</span>
+    <span class="k">using</span> <span class="n">base</span><span class="o">::</span><span class="n">base</span><span class="p">;</span>
+    <span class="k">constexpr</span> <span class="nf">enable_default_constructor</span><span class="p">()</span>
+        <span class="o">:</span> <span class="n">base</span><span class="p">{</span><span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">in_place_type</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span><span class="p">}</span>
+    <span class="p">{</span>
+    <span class="p">}</span>
+  <span class="p">};</span>
+  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span> <span class="k">using</span> <span class="n">select_expected_base</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">conditional_t</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">is_default_constructible</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;::</span><span class="n">value</span><span class="p">,</span> <span class="n">enable_default_constructor</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">expected_result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;&gt;</span><span class="p">;</span>
+<span class="p">}</span>
+<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span> <span class="k">class</span><span class="err"> </span><span class="nc">expected</span> <span class="o">:</span> <span class="k">public</span> <span class="n">detail</span><span class="o">::</span><span class="n">select_expected_base</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;</span>
+<span class="p">{</span>
+  <span class="k">static_assert</span><span class="p">(</span><span class="o">!</span><span class="n">std</span><span class="o">::</span><span class="n">is_same</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;::</span><span class="n">value</span><span class="p">,</span> <span class="s">&#34;T and E cannot be the same in this expected implementation&#34;</span><span class="p">);</span>
+  <span class="k">using</span> <span class="n">base</span> <span class="o">=</span> <span class="n">detail</span><span class="o">::</span><span class="n">select_expected_base</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;</span><span class="p">;</span>
+
+<span class="k">public</span><span class="o">:</span>
+  <span class="c1">// Inherit base&#39;s constructors
+</span><span class="c1"></span>  <span class="k">using</span> <span class="n">base</span><span class="o">::</span><span class="n">base</span><span class="p">;</span>
+  <span class="n">expected</span><span class="p">()</span> <span class="o">=</span> <span class="k">default</span><span class="p">;</span>
+
+  <span class="c1">// Expected takes in_place not in_place_type
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err">... </span><span class="nc">Args</span><span class="o">&gt;</span>
+  <span class="k">constexpr</span> <span class="k">explicit</span> <span class="n">expected</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">in_place_t</span> <span class="cm">/*unused*/</span><span class="p">,</span> <span class="n">Args</span> <span class="o">&amp;&amp;</span><span class="p">...</span> <span class="n">args</span><span class="p">)</span>
+      <span class="o">:</span> <span class="n">base</span><span class="p">{</span><span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">in_place_type</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">Args</span><span class="o">&gt;</span><span class="p">(</span><span class="n">args</span><span class="p">)...}</span>
+  <span class="p">{</span>
+  <span class="p">}</span>
+
+  <span class="c1">// Expected always accepts a T even if ambiguous
+</span><span class="c1"></span>  <span class="n">BOOST_OUTCOME_TEMPLATE</span><span class="p">(</span><span class="k">class</span><span class="err"> </span><span class="nc">U</span><span class="p">)</span>
+  <span class="n">BOOST_OUTCOME_TREQUIRES</span><span class="p">(</span><span class="n">BOOST_OUTCOME_TPRED</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">is_constructible</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">U</span><span class="o">&gt;::</span><span class="n">value</span><span class="p">))</span>
+  <span class="k">constexpr</span> <span class="n">expected</span><span class="p">(</span><span class="n">U</span> <span class="o">&amp;&amp;</span><span class="n">v</span><span class="p">)</span>
+      <span class="o">:</span> <span class="n">base</span><span class="p">{</span><span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">in_place_type</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">U</span><span class="o">&gt;</span><span class="p">(</span><span class="n">v</span><span class="p">)}</span>
+  <span class="p">{</span>
+  <span class="p">}</span>
+
+  <span class="c1">// Expected has an emplace() modifier
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err">... </span><span class="nc">Args</span><span class="o">&gt;</span> <span class="kt">void</span> <span class="n">emplace</span><span class="p">(</span><span class="n">Args</span> <span class="o">&amp;&amp;</span><span class="p">...</span> <span class="n">args</span><span class="p">)</span> <span class="p">{</span> <span class="o">*</span><span class="k">static_cast</span><span class="o">&lt;</span><span class="n">base</span> <span class="o">*&gt;</span><span class="p">(</span><span class="k">this</span><span class="p">)</span> <span class="o">=</span> <span class="n">base</span><span class="p">{</span><span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">in_place_type</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">Args</span><span class="o">&gt;</span><span class="p">(</span><span class="n">args</span><span class="p">)...};</span> <span class="p">}</span>
+
+  <span class="c1">// Expected has a narrow operator* and operator-&gt;
+</span><span class="c1"></span>  <span class="k">constexpr</span> <span class="k">const</span> <span class="n">T</span> <span class="o">&amp;</span><span class="k">operator</span><span class="o">*</span><span class="p">()</span> <span class="k">const</span> <span class="o">&amp;</span> <span class="p">{</span> <span class="k">return</span> <span class="n">base</span><span class="o">::</span><span class="n">assume_value</span><span class="p">();</span> <span class="p">}</span>
+  <span class="k">constexpr</span> <span class="n">T</span> <span class="o">&amp;</span><span class="k">operator</span><span class="o">*</span><span class="p">()</span> <span class="o">&amp;</span> <span class="p">{</span> <span class="k">return</span> <span class="n">base</span><span class="o">::</span><span class="n">assume_value</span><span class="p">();</span> <span class="p">}</span>
+  <span class="k">constexpr</span> <span class="k">const</span> <span class="n">T</span> <span class="o">&amp;&amp;</span><span class="k">operator</span><span class="o">*</span><span class="p">()</span> <span class="k">const</span> <span class="o">&amp;&amp;</span> <span class="p">{</span> <span class="k">return</span> <span class="n">base</span><span class="o">::</span><span class="n">assume_value</span><span class="p">();</span> <span class="p">}</span>
+  <span class="k">constexpr</span> <span class="n">T</span> <span class="o">&amp;&amp;</span><span class="k">operator</span><span class="o">*</span><span class="p">()</span> <span class="o">&amp;&amp;</span> <span class="p">{</span> <span class="k">return</span> <span class="n">base</span><span class="o">::</span><span class="n">assume_value</span><span class="p">();</span> <span class="p">}</span>
+  <span class="k">constexpr</span> <span class="k">const</span> <span class="n">T</span> <span class="o">*</span><span class="k">operator</span><span class="o">-&gt;</span><span class="p">()</span> <span class="k">const</span> <span class="p">{</span> <span class="k">return</span> <span class="o">&amp;</span><span class="n">base</span><span class="o">::</span><span class="n">assume_value</span><span class="p">();</span> <span class="p">}</span>
+  <span class="k">constexpr</span> <span class="n">T</span> <span class="o">*</span><span class="k">operator</span><span class="o">-&gt;</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="o">&amp;</span><span class="n">base</span><span class="o">::</span><span class="n">assume_value</span><span class="p">();</span> <span class="p">}</span>
+
+  <span class="c1">// Expected has a narrow error() observer
+</span><span class="c1"></span>  <span class="k">constexpr</span> <span class="k">const</span> <span class="n">E</span> <span class="o">&amp;</span><span class="n">error</span><span class="p">()</span> <span class="k">const</span> <span class="o">&amp;</span> <span class="p">{</span> <span class="k">return</span> <span class="n">base</span><span class="o">::</span><span class="n">assume_error</span><span class="p">();</span> <span class="p">}</span>
+  <span class="k">constexpr</span> <span class="n">E</span> <span class="o">&amp;</span><span class="n">error</span><span class="p">()</span> <span class="o">&amp;</span> <span class="p">{</span> <span class="k">return</span> <span class="n">base</span><span class="o">::</span><span class="n">assume_error</span><span class="p">();</span> <span class="p">}</span>
+  <span class="k">constexpr</span> <span class="k">const</span> <span class="n">E</span> <span class="o">&amp;&amp;</span><span class="n">error</span><span class="p">()</span> <span class="k">const</span> <span class="o">&amp;&amp;</span> <span class="p">{</span> <span class="k">return</span> <span class="n">base</span><span class="o">::</span><span class="n">assume_error</span><span class="p">();</span> <span class="p">}</span>
+  <span class="k">constexpr</span> <span class="n">E</span> <span class="o">&amp;</span><span class="n">error</span><span class="p">()</span> <span class="o">&amp;&amp;</span> <span class="p">{</span> <span class="k">return</span> <span class="n">base</span><span class="o">::</span><span class="n">assume_error</span><span class="p">();</span> <span class="p">}</span>
+<span class="p">};</span>
+<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span> <span class="k">class</span><span class="err"> </span><span class="nc">expected</span><span class="o">&lt;</span><span class="kt">void</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;</span> <span class="o">:</span> <span class="k">public</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">void</span><span class="p">,</span> <span class="n">E</span><span class="p">,</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">policy</span><span class="o">::</span><span class="n">throw_bad_result_access</span><span class="o">&lt;</span><span class="n">E</span><span class="p">,</span> <span class="kt">void</span><span class="o">&gt;&gt;</span>
+<span class="p">{</span>
+  <span class="k">using</span> <span class="n">base</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">void</span><span class="p">,</span> <span class="n">E</span><span class="p">,</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">policy</span><span class="o">::</span><span class="n">throw_bad_result_access</span><span class="o">&lt;</span><span class="n">E</span><span class="p">,</span> <span class="kt">void</span><span class="o">&gt;&gt;</span><span class="p">;</span>
+
+<span class="k">public</span><span class="o">:</span>
+  <span class="c1">// Inherit base constructors
+</span><span class="c1"></span>  <span class="k">using</span> <span class="n">base</span><span class="o">::</span><span class="n">base</span><span class="p">;</span>
+
+  <span class="c1">// Expected has a narrow operator* and operator-&gt;
+</span><span class="c1"></span>  <span class="k">constexpr</span> <span class="kt">void</span> <span class="k">operator</span><span class="o">*</span><span class="p">()</span> <span class="k">const</span> <span class="p">{</span> <span class="n">base</span><span class="o">::</span><span class="n">assume_value</span><span class="p">();</span> <span class="p">}</span>
+  <span class="k">constexpr</span> <span class="kt">void</span> <span class="k">operator</span><span class="o">-&gt;</span><span class="p">()</span> <span class="k">const</span> <span class="p">{</span> <span class="n">base</span><span class="o">::</span><span class="n">assume_value</span><span class="p">();</span> <span class="p">}</span>
+<span class="p">};</span>
+<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span> <span class="k">using</span> <span class="n">unexpected</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">failure_type</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span><span class="p">;</span>
+<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span> <span class="n">unexpected</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="n">make_unexpected</span><span class="p">(</span><span class="n">E</span> <span class="o">&amp;&amp;</span><span class="n">arg</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">return</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">failure</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span><span class="p">(</span><span class="n">arg</span><span class="p">));</span>
+<span class="p">}</span>
+<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="p">,</span> <span class="k">class</span><span class="err">... </span><span class="nc">Args</span><span class="o">&gt;</span> <span class="n">unexpected</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="n">make_unexpected</span><span class="p">(</span><span class="n">Args</span> <span class="o">&amp;&amp;</span><span class="p">...</span> <span class="n">args</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">return</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">failure</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">Args</span><span class="o">&gt;</span><span class="p">(</span><span class="n">args</span><span class="p">)...);</span>
+<span class="p">}</span>
+<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span> <span class="k">using</span> <span class="n">bad_expected_access</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">bad_result_access_with</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/expected_implementation.cpp#L35" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<h2 id="why-doesn-t-outcome-duplicate-std-expected-t-e-s-design">Why doesn&rsquo;t Outcome duplicate <code>std::expected&lt;T, E&gt;</code>&rsquo;s design?</h2>
+
+<p>There are a number of reasons:</p>
+
+<ol>
+<li><p>Outcome is not aimed at the same audience as Expected. We target developers
+and users who would be happy to use Boost. Expected targets the standard library user.</p></li>
+
+<li><p>Outcome believes that the monadic use case isn&rsquo;t as important as Expected does.
+Specifically, we think that 99% of use of Expected in the real world will be to
+return failure from functions, and not as some sort of enhanced or &ldquo;rich&rdquo; Optional.
+Outcome therefore models a subset of Variant, whereas Expected models an extended Optional.</p></li>
+
+<li><p>Outcome believes that if you are thinking about using something like Outcome,
+then for you writing failure code will be in the same proportion as writing success code,
+and thus in Outcome writing for failure is exactly the same as writing for success.
+Expected assumes that success will be more common than failure, and makes you type
+more when writing for failure.</p></li>
+
+<li><p>Outcome goes to considerable effort to help the end user type fewer characters
+during use. This results in tighter, less verbose, more succinct code. The cost of this is a steeper
+learning curve and more complex mental model than when programming with Expected.</p></li>
+
+<li><p>Outcome has facilities to make easier interoperation between multiple third
+party libraries each using incommensurate Outcome (or Expected) configurations. Expected does
+not do any of this, but subsequent WG21 papers do propose various interoperation
+mechanisms, <a href="https://wg21.link/P0786">one of which</a> Outcome implements so code using Expected will seamlessly
+interoperate with code using Outcome.</p></li>
+
+<li><p>Outcome was designed with the benefit of hindsight after Optional and Expected,
+where how those do implicit conversions have been found to be prone to writing
+unintentionally buggy code. Outcome simultaneously permits more implicit conversions
+for ease of use and convenience, where those are unambigiously safe, and prevents
+other implicit conversions which the Boost peer review reported as dangerous.</p></li>
+</ol>
+
+<h2 id="is-outcome-riddled-with-undefined-behaviour-for-const-const-containing-and-reference-containing-types">Is Outcome riddled with undefined behaviour for const, const-containing and reference-containing types?</h2>
+
+<p>The short answer is not any more in C++ 20 and after, thanks to changes made to
+C++ 20 at the Belfast WG21 meeting in November 2019.</p>
+
+<p>The longer answer is that before C++ 20, use of placement
+new on types containing <code>const</code> member types where the resulting pointer was
+thrown away is undefined behaviour. As of the resolution of a national body
+comment, this is no longer the case, and now Outcome is free of this particular
+UB for C++ 20 onwards.</p>
+
+<p>This still affects C++ before 20, though no major compiler is affected. Still,
+if you wish to avoid UB, don&rsquo;t use <code>const</code> types within Outcome types (or any
+<code>optional&lt;T&gt;</code>, or <code>vector&lt;T&gt;</code> or any STL container type for that matter).</p>
+
+<h3 id="more-detail">More detail</h3>
+
+<p>Before the C++ 14 standard, placement new into storage which used to contain
+a const type was straight out always undefined behaviour, period. Thus all use of
+placement new within a <code>result&lt;const_containing_type&gt;</code>, or indeed an <code>optional&lt;const_containing_type&gt;</code>, is always
+undefined behaviour before C++ 14. From <code>[basic.life]</code> for the C++ 11 standard:</p>
+
+<blockquote>
+<p>Creating a new object at the storage location that a const object with static,
+thread, or automatic storage duration occupies or, at the storage location
+that such a const object used to occupy before its lifetime ended results
+in undefined behavior.</p>
+</blockquote>
+
+<p>This being excessively restrictive, from C++ 14 onwards, <code>[basic_life]</code> now states:</p>
+
+<blockquote>
+<p>If, after the lifetime of an object has ended and before the storage which
+the object occupied is reused or released, a new object is created at the
+storage location which the original object occupied, a pointer that
+pointed to the original object, a reference that referred to the original
+object, or the name of the original object will automatically refer to the
+new object and, once the lifetime of the new object has started, can be
+used to manipulate the new object, if:</p>
+
+<p>— the storage for the new object exactly overlays the storage location which
+    the original object occupied, and</p>
+
+<p>— the new object is of the same type as the original object (ignoring the
+    top-level cv-qualifiers), and</p>
+
+<p>— the type of the original object is not const-qualified, and, if a class type,
+    does not contain any non-static data member whose type is const-qualified
+    or a reference type, and</p>
+
+<p>— neither the original object nor the new object is a potentially-overlapping
+    subobject</p>
+</blockquote>
+
+<p>Leaving aside my personal objections to giving placement new of non-const
+non-reference types magical pointer renaming powers, the upshot is that if
+you want defined behaviour for placement new of types containing const types
+or references, you must store the pointer returned by placement new, and use
+that pointer for all further reference to the newly created object. This
+obviously adds eight bytes of storage to a <code>result&lt;const_containing_type&gt;</code>, which is highly
+undesirable given all the care and attention paid to keeping it small. The alternative
+is to use 
+<a href="https://en.cppreference.com/w/cpp/utility/launder" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::launder</code></a>
+, which was added in C++ 17, to &lsquo;launder&rsquo;
+the storage into which we placement new before each and every use of that
+storage. This forces the compiler to reload the object stored by placement
+new on every occasion, and not assume it can be constant propagated, which
+impacts codegen quality.</p>
+
+<p>As mentioned above, this issue (in so far as it applies to types containing
+user supplied <code>T</code> which might be <code>const</code>) has been resolved as of C++ 20 onwards,
+and it is extremely unlikely that any C++ compiler will act on any UB here in
+C++ 17 or 14 given how much of STL containers would break.</p>
+
+
+
+        </div><p><small>Last revised: April 20, 2021 at 11:39:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>History - Boost.Outcome documentation</title>
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">History</h1></div></div></div>
+  <div class="toc"><dl class="toc">
+<dt>
+<dd><dl>
+<dt><a href="#the-genesis-of-outcome-v1-2014-2017">The genesis of Outcome v1 (2014 - 2017)</a></dt>
+<dt><a href="#outcome-v2-2018">Outcome v2 (2018)</a></dt>
+<dt><a href="#outcome-v2-1-2019-2020">Outcome v2.1 (2019 - 2020)</a></dt>
+<dt><a href="#outcome-v2-2-2021">Outcome v2.2 (2021)</a></dt>
+<dt><a href="#outcome-v2-2-3-2022">Outcome v2.2.3 (2022)</a></dt>
+</dl></dd></dt>
+</dl>
+  </div>
+
+
+<p>Outcome has had an interesting history, and it is worth summarising it here to show how a
+Boost library comes to life. The following recollections are by Niall Douglas, and may be
+faulty due to his aging memory.</p>
+
+
+<center><img src="./history/graph.png"></center>
+
+<h2 id="the-genesis-of-outcome-v1-2014-2017">The genesis of Outcome v1 (2014 - 2017)</h2>
+
+<p>The git repo began life as a &ldquo;Boost.Spinlock&rdquo; in June 2014 hived out of Boost.AFIO v1 where it had existed
+for some time as an internal library. In October 2014 I added in the original prototype
+Boost.Expected reference library as a git submodule, and began developing a non-allocating
+<code>future&lt;T&gt;</code>/<code>promise&lt;T&gt;</code> as an extension of <code>expected&lt;T, std::exception_ptr&gt;</code> as a faster,
+monadic future-promise was something which AFIO v1 sorely needed.</p>
+
+<p>The original prototype Boost.Expected library was a large and very complex beastie.
+I was fortunate to be employed on a contract in late 2014 early 2015 where I saw it deployed at
+scale into an existing large C++ codebase. Expected was really great and powerful, but it absolutely
+murdered compile times in a large C++ codebase, and made LTO effectively infeasible.
+I also found its implementation non-conducive to implementing
+future-promise with it, and so I resolved to implement a much more powerful policy driven
+monad factory which could stamp out everything from an <code>option&lt;T&gt;</code> right through to a
+future-promise pair, all using the exact same <code>basic_monad&lt;&gt;</code> and therefore all with a full
+monadic programming API, C++ 17 continuations/monadic bind and intelligently convertible into one another.
+Moreover, all this needed to have an absolute minimum impact on compile times and runtime
+overheads, neither of which were strengths of the original prototype Boost.Expected library.</p>
+
+<p>By August 2015 &ldquo;Boost.Monad&rdquo; was delivering on all those requirements and then some, but it lacked
+maturity through use in other code. Summer 2015 saw the Boost peer review of AFIO v1 which
+was roundly rejected. After considering the ample review feedback, it was realised that
+<a href="https://ned14.github.io/llfio/">AFIO v2</a> would be a very different design, one no longer using futures, memory allocation
+nor C++ exceptions. As AFIO v2 was started from scratch and using Outcome heavily from the
+very beginning (every AFIO v2 API returns a <code>result&lt;T&gt;</code>), Outcome began to gain bug fixes and
+shed features, with the non-allocating future-promise implementation being dropped in May
+2016 and a large chunk of type based metaprogramming being replaced with cleaner variable template metaprogramming
+in June. After CppCon 2016 in September, then began the long process of getting Outcome
+ready for Boost peer review in Q1 2017 which involved a repeated sequence of complete rewrites
+of the tutorial in response to multiple rounds of feedback from the C++ community, with
+at least four complete rewrites currently at the time of writing.</p>
+
+<p>In parallel to all this development on Outcome, Expected went before the LEWG and entered
+the C++ standards track. As the WG21 meetings went by, Expected experienced a period
+of being stripped back and much of the complexity which had so murdered compile and
+link times in 2014-2015 fell away, thus the Expected proposed in P0323R1 ended up landing
+so close to Outcome that in January 2017 it was just a few hours work to implement
+Expected using the core <code>basic_monad</code> infrastructure in Outcome. That highly flexible
+policy based design which made monadic future-promise possible made it similarly easy
+to implement a highly conforming Expected, indeed in early 2017 Outcome&rsquo;s Expected was much
+closer to <a href="http://wg21.link/P0323">P0323R1</a> than any other implementation including the LEWG reference implementation.
+And unlike the LEWG reference implementation, Outcome has had eighteen months of that
+finely tuned patina you only get when a library is in use by other code bases.</p>
+
+<p>In February 2017 it became realised that the userbase really wanted a high quality <code>expected&lt;T, E&gt;</code>
+implementation rather than anything similar but not the same which Outcome had invented.
+The only just implemented Expected implementation based on <code>basic_monad</code> therefore took
+primacy. The final rewrite of the documentation before peer review submission was one
+which made it look like Outcome was primarily an <code>expected&lt;T, E&gt;</code> implementation with a
+few useful extensions like <code>outcome&lt;T&gt;</code> and <code>result&lt;T&gt;</code>. I was sad to so pivot, but it
+was obvious that Outcome would see far wider popularity and usage as primarily an Expected
+implementation.</p>
+
+<p>Almost three years after its beginning, Outcome v1 finally went before Boost peer review
+in May 2017 which turned into one of the longest and most detailed peer reviews Boost has
+done in recent years, with over 800 pieces of review feedback submitted. It was by consensus
+rejected, <a href="https://lists.boost.org/boost-announce/2017/06/0510.php">with substantial feedback on what to do instead</a>.</p>
+
+<h2 id="outcome-v2-2018">Outcome v2 (2018)</h2>
+
+<p>During the very lengthy peer review, roughly three groups of opinion emerged as to what
+a <code>value|error</code> transporting class ought to look like:</p>
+
+<dl>
+<dt><b>1. Lightweight</b></dt>
+<dd>A simple-as-possible <code>T</code> and/or <code>E</code> transport without any
+implementation complexity.</dd>
+<dt><b>2. Medium</b></dt>
+<dd>A variant stored <code>T</code> or <code>E1</code> ... <code>E<i>n</i></code>
+where <code>T</code> is the expected value and <code>E1 ...</code>
+are the potential unexpected values. This implemention really ought to be implemented
+using C++ 17's <code>std::variant<...></code> except with stronger never-empty guarantees.
+</dd>
+<dt><b>3. Heavy</b></dt>
+<dd>A full fat Either monad participating fully in a wider monadic programming framework for C++.</dd>
+</dl>
+
+<p>Peter Dimov was very quickly able to implement an <code>expected&lt;T, E1, ...&gt;</code> using his
+<a href="https://github.com/pdimov/variant2">variant2</a> library, and thus there seemed little
+point in replicating his work in an Outcome v2. The lightweight choice seemed to be the
+best path forwards, so in June 2017 the bare minimum <code>result&lt;T, E&gt;</code> and <code>outcome&lt;T, EC, P&gt;</code>
+as presented in this library was built, using the same constructor design as <code>std::variant&lt;...&gt;</code>.
+Significant backwards compatibility with v1 Outcome code was retained, as the review
+had felt the basic proposed design fine.</p>
+
+<p>A period of maturation then followed by porting a large existing codebase using Outcome v1
+to v2, and writing a significant amount of new code using v2 to test it for unanticipated
+surprises and bugs. Quite a few corner cases were found and fixed. At the end of September
+2017, Outcome v2 was deemed to be &ldquo;mature&rdquo;, and a script generated &ldquo;Boost edition&rdquo; made
+available.</p>
+
+<p>All that remained before it was ready for a second Boost peer review was the
+documentation. This took four months to write (same time as to write the library itself!),
+and in January 2018 Outcome had its second Boost peer review, which it passed!</p>
+
+<h2 id="outcome-v2-1-2019-2020">Outcome v2.1 (2019 - 2020)</h2>
+
+<p>The changes requsted during the review of v2.0 were fairly modest: <code>result</code> and <code>outcome</code> would
+be renamed to <code>basic_result</code> and <code>basic_outcome</code>, and a clean separation of concerns between the
+<code>basic_*</code> layer and the &ldquo;convenience&rdquo; layer would be created. That suited Outcome nicely,
+as the <code>basic_*</code> layer could have minimum possible header dependencies and thus minimum possible build times
+impact, which was great for big iron users with multi-million line C++ codebases. This also
+had the nice side effect of permitting both Boost and <code>std</code> implementations to be supported
+concurrently in both Outcome and Boost.Outcome.</p>
+
+<p>By April 2018, v2.1 was feature complete and entered a six month period of maturation and
+battle hardening under its already extensive userbase. However Outcome passing its review in January 2018 had much more consequence than I could have ever
+expected. Unbeknownst to me, some of the WG21 leadership had interpreted the success of
+Outcome, and especially its divergences from WG21 Expected into a more complete substitute
+for C++ exception handling, as a sign that the C++
+exception handling mechanism was no longer fit for purpose. <a href="http://wg21.link/P0709">It was thus proposed
+to remedy the standard exception handling mechanism into something much more
+efficient, thus rendering Outcome obsolete in future C++ standards (P0709 <em>Zero overhead exceptions</em>)</a>.</p>
+
+<p>Concurrently to that, just before the review of Outcome 2.0, I had mooted a number of semantic and compile time performance
+improvements to <code>&lt;system_error&gt;</code> with the proposal that we mildly break Boost.System with
+improvements and see how badly real world code broke in response. This was not widely
+accepted at that time (though they have been since incorporated into Boost.System, and proposed
+defect remedies for <code>&lt;system_error&gt;</code> for C++ 23). I therefore wrote <a href="https://ned14.github.io/status-code/">an improved <code>&lt;system_error2&gt;</code></a> which fixed all the problems
+listed at <a href="https://wg21.link/P0824">P0824 (Summary of SG14 discussion on <code>&lt;system_error&gt;</code>)</a>
+and fixed up Outcome so one could use it without any system error implementation,
+or with the STL one or with the proposed improved one. This improved <code>&lt;system_error2&gt;</code>
+was then proposed as <a href="http://wg21.link/P1028">the standard library support for Zero overhead exceptions as proposed
+<code>std::error</code></a>.</p>
+
+<p>A flurry of papers and discussion then resulted, running up to the Prague 2020 WG21
+meeting where WG21 liked the library part of deterministic exceptions i.e. <code>std::error</code>,
+and wanted to see a working implementation of a compiler implementing the language
+part before moving further. The covid pandemic then ceased face to face meetings which
+deeply impacted WG21 productivity, so everything large which was not yet approved for
+entry into C++ 23 went on pause.</p>
+
+<h2 id="outcome-v2-2-2021">Outcome v2.2 (2021)</h2>
+
+<p>Outcome was sufficiently popular, and widely known as the closest simulacrum of deterministic
+exceptions currently available in C++, that it was regularly benchmarked as such on an &lsquo;as if&rsquo;
+basis by a number of people in the wider C++ ecosystem, including comparing their &lsquo;better Outcome
+alternatives&rsquo; to Outcome, where invariably Outcome appeared to lose badly in various
+synthetic tests. Whilst any empirical measurements in the real world code never showed
+a statistically significant difference, it was certainly true that v2.1&rsquo;s codegen in
+assembler was not ideal.</p>
+
+<p>On the behalf of WG21, Ben Craig did some benchmarking work on Outcome v2.1 in <a href="https://wg21.link/P1886">P1886 <em>Error speed benchmarking</em></a>,
+where it did not perform as well as expected compared to alternatives such as returning
+a simple integer from a function. This led to a
+<a href="https://github.com/ned14/outcome/tree/better_optimisation"><code>better_optimisation</code></a> branch.
+The changes were felt worth merging into Outcome as v2.2.0, the first major version release
+since Outcome entered Boost in early 2019. To give enough time to sign post to users that these
+source incompatible changes were coming, all of 2020 was given over to announcement of the
+upcoming merge of the breaking v2.2 branch into master branch in early 2021.</p>
+
+<p>In terms of codegen benefits for proposed <code>std::error</code> based code (i.e. code using
+<a href="./experimental.html">Outcome experimental</a>), v2.2 implements a library-based
+emulation of <a href="https://wg21.link/P1029">P1029 <em>move = bitcopies</em></a>, a proposed compiler
+enhancement which can treat some move-only types as bags of bits. This very significantly
+improves the appearance in assembler of experimental Outcome based code.</p>
+
+<h2 id="outcome-v2-2-3-2022">Outcome v2.2.3 (2022)</h2>
+
+<p>Outcome v2.2 saw much popularity and very few issues reported after a year in the wild,
+so the decision was taken <a href="./abi-stability.html">to write the v2.2.3 Outcome ABI into stone</a> going forward.
+This is the guarantee that binaries compiled with the v2.2.3 release will link and work
+without issue with binaries compiled with any later version of Outcome.</p>
+
+<p>This pretty much draws a line under further significant development of Outcome &ndash; it
+has now effectively entered &lsquo;sustaining&rsquo;, as big multinationals would term it i.e.
+only small bug fixes and maintenance for future toolchains and languages etc would
+be expected going forth from now.</p>
+
+
+
+        </div><p><small>Last revised: December 16, 2021 at 11:42:04 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./changelog/v22.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./requirements.html"><img src="./images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/history/graph.png b/doc/html/history/graph.png
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diff --git a/doc/html/images/header-fg.png b/doc/html/images/header-fg.png
new file mode 100644
index 0000000000000000000000000000000000000000..549c812e166e3e23fc154147813ed4376f2cfaa6
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+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Home - Boost.Outcome documentation</title>
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+    
+
+<h1 id="outcome-2-2-library">Outcome 2.2 library</h1>
+
+<div>
+  <div class="author">
+    <h3 class="author"><span class="firstname">Niall</span> <span class="surname">Douglas</span></h3>
+  </div>
+</div>
+<div><p class="copyright">Copyright &#169; 2014-2024 Niall Douglas <a href="./credits.html">and others</a></p></div>
+<div><div class="legalnotice">
+<a name="outcome.legal"></a><p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="./LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div></div>
+<div class="toc">
+<p><b>Table of Contents</b></p>
+<dl class="toc">
+  <dt><span class="section"><a href="./requirements.html">Prerequisites</a></span></dt>
+  <dt><span class="section"><a href="./build.html">Build and install</a></span></dt>
+  <dt><span class="section"><a href="./alternatives.html">Review of Error Handling Frameworks</a></span></dt>
+        <dd><dl>
+  <dt><span class="section"><a href="./alternatives/exceptions.html">std exception throws</a></span></dt>
+  <dt><span class="section"><a href="./alternatives/error_code.html">std error codes</a></span></dt>
+  <dt><span class="section"><a href="./alternatives/expected.html">std expected</a></span></dt>
+  <dt><span class="section"><a href="./alternatives/outcome.html">Outcome (proposed std result)</a></span></dt>
+  <dt><span class="section"><a href="./alternatives/leaf.html">LEAF</a></span></dt>
+        </dl></dd>
+  <dt><span class="section"><a href="./motivation.html">Motivation</a></span></dt>
+        <dd><dl>
+  <dt><span class="section"><a href="./motivation/exceptions.html">Exceptions</a></span></dt>
+  <dt><span class="section"><a href="./motivation/errno.html">errno</a></span></dt>
+  <dt><span class="section"><a href="./motivation/error_codes.html">Error codes</a></span></dt>
+  <dt><span class="section"><a href="./motivation/std_error_code.html">std::error_code</a></span></dt>
+  <dt><span class="section"><a href="./motivation/plug_error_code.html">Plugging a library into <code>std::error_code</code></a></span></dt>
+  <dt><span class="section"><a href="./motivation/plug_error_code2.html">Plugging a library into <code>boost::system::error_code</code></a></span></dt>
+  <dt><span class="section"><a href="./motivation/narrow_contract.html">Narrow contracts</a></span></dt>
+        </dl></dd>
+  <dt><span class="section"><a href="./abi-stability.html">Future ABI stability guarantees</a></span></dt>
+  <dt><span class="section"><a href="./tutorial.html">Tutorial</a></span></dt>
+        <dd><dl>
+  <dt><span class="section"><a href="./tutorial/essential.html">Essential</a></span></dt>
+  <dt><span class="section"><a href="./tutorial/advanced.html">Advanced</a></span></dt>
+        </dl></dd>
+  <dt><span class="section"><a href="./recipes.html">Recipes</a></span></dt>
+        <dd><dl>
+  <dt><span class="section"><a href="./recipes/asio-integration.html">ASIO/Networking TS : Boost &lt; 1.70</a></span></dt>
+  <dt><span class="section"><a href="./recipes/asio-integration-1-70.html">ASIO/Networking TS: Boost &gt;= 1.70</a></span></dt>
+  <dt><span class="section"><a href="./recipes/foreign-try.html">Extending <code>BOOST_OUTCOME_TRY</code></a></span></dt>
+        </dl></dd>
+  <dt><span class="section"><a href="./experimental.html">Experimental</a></span></dt>
+        <dd><dl>
+  <dt><span class="section"><a href="./experimental/advantages.html">The main advantages</a></span></dt>
+  <dt><span class="section"><a href="./experimental/map.html">Approximate map between error code designs</a></span></dt>
+  <dt><span class="section"><a href="./experimental/differences.html">Major differences</a></span></dt>
+  <dt><span class="section"><a href="./experimental/status_result.html"><code>status_result</code> and <code>status_outcome</code></a></span></dt>
+  <dt><span class="section"><a href="./experimental/outcome.html">Tying it all together</a></span></dt>
+  <dt><span class="section"><a href="./experimental/worked-example.html">Worked example: Custom domain (the short way)</a></span></dt>
+  <dt><span class="section"><a href="./experimental/worked-example-long.html">Worked example: Custom domain (the long way)</a></span></dt>
+  <dt><span class="section"><a href="./experimental/c-api.html">Using Outcome from C code</a></span></dt>
+        </dl></dd>
+  <dt><span class="section"><a href="./reference.html">API reference</a></span></dt>
+        <dd><dl>
+  <dt><span class="section"><a href="./reference/macros.html">Macros</a></span></dt>
+  <dt><span class="section"><a href="./reference/concepts.html">Concepts</a></span></dt>
+  <dt><span class="section"><a href="./reference/converters.html">Converters</a></span></dt>
+  <dt><span class="section"><a href="./reference/traits.html">Traits</a></span></dt>
+  <dt><span class="section"><a href="./reference/policies.html">Policies</a></span></dt>
+  <dt><span class="section"><a href="./reference/types.html">Types</a></span></dt>
+  <dt><span class="section"><a href="./reference/aliases.html">Aliases</a></span></dt>
+  <dt><span class="section"><a href="./reference/functions.html">Functions</a></span></dt>
+        </dl></dd>
+  <dt><span class="section"><a href="./faq.html">Frequently asked questions</a></span></dt>
+  <dt><span class="section"><a href="./videos.html">Videos</a></span></dt>
+  <dt><span class="section"><a href="./changelog.html">Changelog</a></span></dt>
+        <dd><dl>
+  <dt><span class="section"><a href="./changelog/upgrade_v21_v22.html">Upgrade guide v2.1 =&gt; v2.2</a></span></dt>
+  <dt><span class="section"><a href="./changelog/v22.html">v2.2 major changes</a></span></dt>
+        </dl></dd>
+  <dt><span class="section"><a href="./history.html">History</a></span></dt>
+
+
+</dl>
+</div>
+<h2 class="title">Introduction</h2>
+
+<div class="notices note" style="background: url('images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>At the end of December 2021, Standalone Outcome
+<a href="./abi-stability.html">went guaranteed future ABI stable</a>.
+From v2.2.3 onwards, you get ABI compatibilty guarantees across Outcome releases.</p>
+</div>
+</div>
+
+
+<p>Outcome is a set of tools for reporting and handling function failures in contexts where <em>directly</em> using C++ exception handling is unsuitable. Such contexts include:</p>
+
+<ul>
+<li><p>there are programs, or parts thereof, that are compiled with exceptions disabled;</p></li>
+
+<li><p>there are parts of program that have a lot of branches depending on types of failures,
+where if-statements are cleaner than try-catch blocks;</p></li>
+
+<li><p>there is a hard requirement that the failure path of execution should not cost more than the successful path of execution;</p></li>
+
+<li><p>there are situations, like in the <a href="http://www.boost.org/doc/libs/release/libs/filesystem/doc/index.htm"><code>filesystem</code></a> library, where whether the failure should be handled remotely
+(using a C++ exception throw), or locally cannot be made inside the function and needs to be decided by the caller,
+and in the latter case throwing a C++ exception is not desirable for the aforementioned reasons;</p></li>
+
+<li><p>there are parts of the program/framework that themselves implement exception handling and prefer
+to not use exceptions to propagate failure reports across threads, tasks, fibers, etc;</p></li>
+
+<li><p>one needs to propagate exceptions through layers that do not implement exception throw safety;</p></li>
+
+<li><p>there is an external requirement (such as a company-wide policy) that failure handling paths are explicitly indicated in the code.</p></li>
+
+<li><p>where interoperation with C code, without having to resort to C++ exception wrapper shims, is important.</p></li>
+
+<li><p>where your mostly C code base needs exception-like error handling, and the subset of Outcome&rsquo;s functionality available in C is sufficient for your needs.</p></li>
+</ul>
+
+<p>Outcome addresses failure handling through returning a special type from functions, which is able to store either a successfully computed value (or <code>void</code>), or the information about failure. Outcome also comes with a set of idioms for dealing with such types.</p>
+
+<p>Particular care has been taken to ensure that Outcome has the lowest possible impact on build times,
+thus making it suitable for use in the global headers of really large codebases. Storage layout is
+guaranteed and is C-compatible for <code>result&lt;T, E&gt;</code><sup class="footnote-ref" id="fnref:1"><a href="#fn:1">1</a></sup>, thus making Outcome based code long term ABI-stable.</p>
+
+<p>Fully deterministic all-<code>noexcept</code> C++ Coroutine support in Outcome is particularly strong, and we
+supply Outcome-optimising <a href="./reference/types/awaitables/eager.html" class="api-reference"><code>eager&lt;T, Executor = void&gt;/atomic_eager&lt;T, Executor = void&gt;</code></a>
+, <a href="./reference/types/awaitables/lazy.html" class="api-reference"><code>lazy&lt;T, Executor = void&gt;/atomic_lazy&lt;T, Executor = void&gt;</code></a>
+
+and <a href="./reference/types/awaitables/generator.html" class="api-reference"><code>generator&lt;T, Executor = void&gt;</code></a>
+ awaitables which work for any user type.</p>
+
+<h2 id="sample-usage-c">Sample usage (C++)</h2>
+
+<p>The main workhorse in the Outcome library is <code>result&lt;T&gt;</code>: it represents either a successfully computed value of type <code>T</code>, or a <code>std::error_code</code>/<code>boost::system::error_code</code><sup class="footnote-ref" id="fnref:2"><a href="#fn:2">2</a></sup> representing the reason for failure. You use it in the function&rsquo;s return type:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">string</span><span class="o">&gt;</span> <span class="n">data_from_file</span><span class="p">(</span><span class="n">string_view</span> <span class="n">path</span><span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/intro_example.cpp#L49" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>It is possible to inspect the state manually:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">if</span> <span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">string</span><span class="o">&gt;</span> <span class="n">rslt</span> <span class="o">=</span> <span class="n">data_from_file</span><span class="p">(</span><span class="s">&#34;config.cfg&#34;</span><span class="p">))</span>
+  <span class="n">use_string</span><span class="p">(</span><span class="n">rslt</span><span class="p">.</span><span class="n">value</span><span class="p">());</span>                   <span class="c1">// returns string
+</span><span class="c1"></span><span class="k">else</span>
+  <span class="k">throw</span> <span class="n">LibError</span><span class="p">{</span><span class="n">rslt</span><span class="p">.</span><span class="n">error</span><span class="p">(),</span> <span class="s">&#34;config.cfg&#34;</span><span class="p">};</span> <span class="c1">// returns error_code
+</span><span class="c1"></span></code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/intro_example.cpp#L54" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Or, if this function is called in another function that also returns <code>result&lt;T&gt;</code>, you can use a dedicated control statement:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">process</span><span class="p">(</span><span class="k">const</span> <span class="n">string</span><span class="o">&amp;</span> <span class="n">content</span><span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span>
+
+<span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">int_from_file</span><span class="p">(</span><span class="n">string_view</span> <span class="n">path</span><span class="p">)</span> <span class="k">noexcept</span>
+<span class="p">{</span>
+  <span class="n">BOOST_OUTCOME_TRY</span><span class="p">(</span><span class="k">auto</span> <span class="n">str</span><span class="p">,</span> <span class="n">data_from_file</span><span class="p">(</span><span class="n">path</span><span class="p">));</span>
+  <span class="c1">// if control gets here data_from_file() has succeeded
+</span><span class="c1"></span>  <span class="k">return</span> <span class="nf">process</span><span class="p">(</span><span class="n">str</span><span class="p">);</span>  <span class="c1">// decltype(str) == string
+</span><span class="c1"></span><span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/intro_example.cpp#L62" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p><code>BOOST_OUTCOME_TRY</code> is a control statement. If the returned <code>result&lt;T&gt;</code> object contains an error information, the enclosing function is immediately returned with <code>result&lt;U&gt;</code> containing the same failure information; otherwise an automatic object of type <code>T</code>
+is available in scope.</p>
+
+<h2 id="sample-usage-c-1">Sample usage (C)</h2>
+
+<p>Equivalent to the C++ API: <code>BOOST_OUTCOME_C_DECLARE_RESULT_SYSTEM(ident, T)</code> declares the C type, thereafter <code>BOOST_OUTCOME_C_RESULT_SYSTEM(ident)</code> refers to it. You use it in the function&rsquo;s return type:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_C_DECLARE_RESULT_SYSTEM</span><span class="p">(</span><span class="n">result_string</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="p">)</span>
+
+<span class="n">BOOST_OUTCOME_C_RESULT_SYSTEM</span><span class="p">(</span><span class="n">result_string</span><span class="p">)</span> <span class="n">data_from_file</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">path</span><span class="p">);</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/intro_c_example.cpp#L40" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>It is possible to inspect the state manually:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="n">BOOST_OUTCOME_C_RESULT_SYSTEM</span><span class="p">(</span><span class="n">result_string</span><span class="p">)</span> <span class="n">rslt</span> <span class="o">=</span> <span class="n">data_from_file</span><span class="p">(</span><span class="s">&#34;config.cfg&#34;</span><span class="p">);</span>
+  <span class="k">if</span><span class="p">(</span><span class="n">BOOST_OUTCOME_C_RESULT_HAS_VALUE</span><span class="p">(</span><span class="n">rslt</span><span class="p">))</span>
+    <span class="n">use_string</span><span class="p">(</span><span class="n">rslt</span><span class="p">.</span><span class="n">value</span><span class="p">);</span>  <span class="c1">// returns string
+</span><span class="c1"></span>  <span class="k">else</span>
+    <span class="nf">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&#34;%s</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span> <span class="n">outcome_status_code_message</span><span class="p">(</span><span class="o">&amp;</span><span class="n">rslt</span><span class="p">.</span><span class="n">error</span><span class="p">));</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/intro_c_example.cpp#L48" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Or, if this function is called in another function that also returns <code>BOOST_OUTCOME_C_RESULT_SYSTEM(ident)</code>, you can use a dedicated control statement:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_C_DECLARE_RESULT_SYSTEM</span><span class="p">(</span><span class="n">result_int</span><span class="p">,</span> <span class="kt">int</span><span class="p">)</span>
+
+<span class="n">BOOST_OUTCOME_C_RESULT_SYSTEM</span><span class="p">(</span><span class="n">result_int</span><span class="p">)</span> <span class="n">process</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">content</span><span class="p">);</span>
+
+<span class="n">BOOST_OUTCOME_C_RESULT_SYSTEM</span><span class="p">(</span><span class="n">result_int</span><span class="p">)</span> <span class="n">int_from_file</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">path</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="n">BOOST_OUTCOME_C_RESULT_SYSTEM_TRY</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">str</span><span class="p">,</span> <span class="n">result_int</span><span class="p">,</span> <span class="cm">/* cleanup on fail */</span><span class="p">,</span> <span class="n">data_from_file</span><span class="p">(</span><span class="n">path</span><span class="p">));</span>
+  <span class="c1">// if control gets here data_from_file() has succeeded
+</span><span class="c1"></span>  <span class="k">return</span> <span class="nf">process</span><span class="p">(</span><span class="n">str</span><span class="p">);</span>  <span class="c1">// decltype(str) == string
+</span><span class="c1"></span><span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/intro_c_example.cpp#L57" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The C Result is guaranteed to be layout identical to its C++ equivalent. Convenience conversion functions are available, but you can reinterpret cast too.</p>
+
+<div class="notices note" style="background: url('images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>This library joined <a href="https://www.boost.org/doc/libs/develop/libs/outcome/doc/html/index.html">the Boost C++ libraries</a> in the 1.70 release (Spring 2019). <a href="https://github.com/boostorg/outcome">It can be grafted into much older Boost releases if desired</a>.</p>
+</div>
+</div>
+
+<div class="footnotes">
+
+<hr />
+
+<ol>
+<li id="fn:1">If you choose a C-compatible <code>T</code> and <code>E</code> type.
+ <a class="footnote-return" href="#fnref:1"><sup>[return]</sup></a></li>
+<li id="fn:2"><code>result&lt;T&gt;</code> defaults to <code>std::error_code</code> for Standalone Outcome, and to <code>boost::system::error_code</code> for Boost.Outcome. You can mandate a choice using <code>std_result&lt;T&gt;</code> or <code>boost_result&lt;T&gt;</code>.
+ <a class="footnote-return" href="#fnref:2"><sup>[return]</sup></a></li>
+</ol>
+</div>
+
+
+        </div><p><small>Last revised: July 16, 2024 at 21:33:35 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./history.html"><img src="./images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./requirements.html"><img src="./images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/motivation.html b/doc/html/motivation.html
new file mode 100644
index 000000000..e03eca098
--- /dev/null
+++ b/doc/html/motivation.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Motivation - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="./alternatives/leaf.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./motivation/exceptions.html"><img src="./images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Motivation</h1></div></div></div>
+<p>This section describes techniques currently used to report and handle failures
+in functions, it also shows why these techniques might be insufficient.</p>
+
+<p>If you just want to learn how to use Outcome library go straight to <a href="./tutorial.html">Tutorial
+section</a>.</p>
+
+<div class="notices note" style="background: url('images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>Motivation section of this documentation is not complete yet.</p>
+</div>
+</div>
+
+
+<ol class="children children-li"><li>
+	<a href="./motivation/exceptions.html" >Exceptions</a>
+<p>Exceptions with their good and bad sides.</p><li>
+	<a href="./motivation/errno.html" >errno</a>
+<p>errno with their good and bad sides.</p><li>
+	<a href="./motivation/error_codes.html" >Error codes</a>
+<p>Error codes with their good and bad sides.</p><li>
+	<a href="./motivation/std_error_code.html" >std::error_code</a>
+<p>Overview of std::error_code</p><li>
+	<a href="./motivation/plug_error_code.html" >Plugging a library into <code>std::error_code</code></a>
+<p>Illustrates how you can hook into the <code>std::error_code</code> system from the Standard Library in order to work with your own set of error codes.</p><li>
+	<a href="./motivation/plug_error_code2.html" >Plugging a library into <code>boost::system::error_code</code></a>
+<p>Illustrates how you can hook into the <code>boost::system::error_code</code> system from Boost in order to work with your own set of error codes.</p><li>
+	<a href="./motivation/narrow_contract.html" >Narrow contracts</a>
+<p>Describes narrow-contract functions that do not work for all input values, and advantage of using them.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: June 27, 2019 at 16:00:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./alternatives/leaf.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./motivation/exceptions.html"><img src="./images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/motivation/errno.html b/doc/html/motivation/errno.html
new file mode 100644
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+++ b/doc/html/motivation/errno.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>errno - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../motivation/exceptions.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../motivation.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../motivation/error_codes.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">errno</h1></div></div></div>
+  
+
+<p>The idiom of returning, upon failure, a special value and storing an error code
+(an <code>int</code>) inside a global (or thread-local) object <code>errno</code> is inherited from C,
+and used in its Standard Library:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">int</span> <span class="nf">readValue</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span> <span class="n">filename</span><span class="p">)</span>
+<span class="p">{</span>  
+  <span class="n">FILE</span><span class="o">*</span> <span class="n">f</span> <span class="o">=</span> <span class="n">fopen</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s">&#34;r&#34;</span><span class="p">);</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">f</span> <span class="o">==</span> <span class="nb">NULL</span><span class="p">)</span>
+    <span class="k">return</span> <span class="mi">0</span><span class="p">;</span> <span class="c1">// special value indicating failure
+</span><span class="c1"></span>              <span class="c1">// keep errno value set by fopen()
+</span><span class="c1"></span>
+  <span class="kt">int</span> <span class="n">i</span><span class="p">;</span>
+  <span class="kt">int</span> <span class="n">r</span> <span class="o">=</span> <span class="n">fscanf</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="s">&#34;%d&#34;</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">i</span><span class="p">);</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">r</span> <span class="o">==</span> <span class="mi">0</span> <span class="o">||</span> <span class="n">r</span> <span class="o">==</span> <span class="n">EOF</span><span class="p">)</span> <span class="p">{</span> <span class="c1">// special values: i not read
+</span><span class="c1"></span>    <span class="n">errno</span> <span class="o">=</span> <span class="n">ENODATA</span><span class="p">;</span>        <span class="c1">// choose error value to return
+</span><span class="c1"></span>    <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
+
+  <span class="n">fclose</span><span class="p">(</span><span class="n">f</span><span class="p">);</span>
+  <span class="n">errno</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>  <span class="c1">// clear error info (success)
+</span><span class="c1"></span>  <span class="k">return</span> <span class="n">i</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div>
+<p>One advantage (to some, and a disadvantage to others) of this technique is that it
+uses familiar control statements (<code>if</code> and <code>return</code>) to indicate all execution
+paths that handle failures. When we read this code we know when and under what
+conditions it can exit without producing the expected result.</p>
+
+<h3 id="downsides">Downsides</h3>
+
+<p>Because on failure, as well as success, we write into a global (or thread-local)
+object, our functions are not <em>pure</em>: they have <em>side effects</em>. This means many
+useful compiler optimizations (like common subexpression elimination) cannot be
+applied. This shows that it is not only C++ that chooses suboptimal solutions
+for reporting failures.</p>
+
+<p>Whatever type we return, we always need a special value to spare, which is
+sometimes troublesome. In the above example, if the successfully read value of
+<code>i</code> is <code>0</code>, and we return it, our callers will think it is a failure even though
+it is not.</p>
+
+<p>Error propagation using <code>if</code> statements and early <code>return</code>s is manual. We can easily
+forget to check for the failure, and incorrectly let the subsequent operations
+execute, potentially causing damage to the program state.</p>
+
+<p>Upon nearly each function call layer we may have to change error code value
+so that it reflects the error condition adequate to the current layer. If we
+do so, the original error code is gone.</p>
+
+
+        </div><p><small>Last revised: January 16, 2019 at 01:05:39 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../motivation/exceptions.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../motivation.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../motivation/error_codes.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Error codes - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../motivation/errno.html"><img src="../images/prev.png" alt="Prev"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">Error codes</h1></div></div></div>
+  
+
+<p>Error codes are reasonable error handling technique, also working in C.
+In this case the information is also stored as an <code>int</code>, but returned by value,
+which makes it possible to make functions pure (side-effect-free and referentially
+transparent).</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">int</span> <span class="nf">readInt</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span> <span class="n">filename</span><span class="p">,</span> <span class="kt">int</span><span class="o">&amp;</span> <span class="n">val</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="n">FILE</span><span class="o">*</span> <span class="n">fd</span><span class="p">;</span>
+  <span class="kt">int</span> <span class="n">r</span> <span class="o">=</span> <span class="n">openFile</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="cm">/*out*/</span> <span class="n">fd</span><span class="p">);</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">r</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span>
+    <span class="k">return</span> <span class="n">r</span><span class="p">;</span> <span class="c1">// return whatever error openFile() returned
+</span><span class="c1"></span>
+  <span class="n">r</span> <span class="o">=</span> <span class="n">readInt</span><span class="p">(</span><span class="n">fd</span><span class="p">,</span> <span class="cm">/*out*/</span> <span class="n">val</span><span class="p">);</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">r</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span>
+    <span class="k">return</span> <span class="n">READERRC_NOINT</span><span class="p">;</span> <span class="c1">// my error code
+</span><span class="c1"></span>
+  <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>   <span class="c1">// success
+</span><span class="c1"></span><span class="p">}</span>
+</code></pre></div>
+<p>Because the type of the error information (<code>int</code>) is known statically, no memory
+allocation or type erasure is required. This technique is very efficient.</p>
+
+<h3 id="downsides">Downsides</h3>
+
+<p>All failure paths written manually can be considered both an advantage and a
+disadvantage. Forgetting to put a failure handling <code>if</code> causes bugs.</p>
+
+<p>If I need to substitute an error code returned by lower-level function with mine
+more appropriate at this level, the information about the original failure is
+gone.</p>
+
+<p>Also, all possible error codes invented by different programmers in different
+third party libraries must fit into one <code>int</code> and not overlap with any other error
+code value. This is quite impossible and does not scale well.</p>
+
+<p>Because errors are communicated through returned values, we cannot use function&rsquo;s
+return type to return computed values. Computed values are written to function
+<em>output</em> parameters, which requires objects to be created before we have values
+to put into them. This requires many objects in unintended state to exist. Writing
+to output parameters often requires an indirection and can incur some run-time cost.</p>
+
+
+        </div><p><small>Last revised: January 16, 2019 at 01:05:39 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../motivation/errno.html"><img src="../images/prev.png" alt="Prev"></a>
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+</html>
diff --git a/doc/html/motivation/exceptions.html b/doc/html/motivation/exceptions.html
new file mode 100644
index 000000000..bfe02764f
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+++ b/doc/html/motivation/exceptions.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Exceptions - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
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+  <div class="titlepage"><div><div><h1 style="clear: both">Exceptions</h1></div></div></div>
+  
+
+<p>Exceptions are the default mechanism in C++ for reporting, propagating and
+processing the information about function failures. Their main advantage is
+the ability to describe the &ldquo;success dependency&rdquo; between functions: if you want to
+say that calling function <code>g()</code> depends on the successful execution of function <code>f()</code>,
+you just put <code>g()</code> below <code>f()</code> and that&rsquo;s it:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">int</span> <span class="nf">a</span><span class="p">()</span>
+<span class="p">{</span>
+  <span class="n">f</span><span class="p">();</span>
+  <span class="n">g</span><span class="p">();</span>        <span class="c1">// don&#39;t call g() and further if f() fails
+</span><span class="c1"></span>  <span class="k">return</span> <span class="n">h</span><span class="p">();</span> <span class="c1">// don&#39;t call h() if g() fails
+</span><span class="c1"></span><span class="p">}</span>
+</code></pre></div>
+<p>In the C++ Standard terms this means that <code>f()</code> is <em>sequenced before</em> <code>g()</code>.
+This makes failure handling extremely easy: in a lot of cases you do not have
+to do anything.</p>
+
+<p>Also, while next operations are being canceled, the exception object containing
+the information about the initial failure is kept on the side. When at some point
+the cancellation cascade is stopped by an exception handler, the exception object
+can be inspected. It can contain arbitrarily big amount of data about the failure
+reason, including the entire call stack.</p>
+
+<h3 id="downsides">Downsides</h3>
+
+<p>There are two kinds of overheads caused by the exception handling mechanism. The
+first is connected with storing the exceptions on the side. Stack unwinding works
+independently in each thread of execution; each thread can be potentially handling
+a number of exceptions (even though only one exception can be active in one thread).
+This requires being prepared for storing an arbitrary number of exceptions of arbitrary
+types per thread. Additional things like jump tables also need to be stored in the
+program binaries.</p>
+
+<p>Second overhead is experienced when throwing an exception and trying to find the
+handler. Since nearly any function can throw an exception of any time, this is
+a dynamic memory allocation. The type of an exception is erased and a run-time type
+identification (RTTI) is required to asses the type of the active exception object.
+The worst case time required for matching exceptions against handlers cannot be easily
+predicted and therefore exceptions are not suitable for real-time or low-latency
+systems.</p>
+
+<p>Another problem connected with exceptions is that while they are good for program
+flows with linear &ldquo;success dependency&rdquo;, they become inconvenient in situations where
+this success dependency does not occur. One such notable example is releasing acquired
+resources which needs to be performed even if previous operations have failed.
+Another example is when some function <code>c()</code> depends on the success of at least one
+of two functions <code>a()</code> and <code>b()</code> (which try, for instance, to store user data by
+two different means), another example is when implementing a strong exception safety
+guarantee we may need to apply some fallback actions when previous operations have
+failed. When failures are reported by exceptions, the semantics of canceling all
+subsequent operations is a hindrance rather than help; these situations require special
+and non-trivial idioms to be employed.</p>
+
+<p>For these reasons in some projects using exceptions is forbidden. Compilers offer
+switches to disable exceptions altogether (they refuse to compile a <code>throw</code>, and turn
+already compiled <code>throw</code>s into calls to <code>std::abort()</code>).</p>
+
+
+        </div><p><small>Last revised: March 22, 2019 at 13:58:05 -0700</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../motivation.html"><img src="../images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/motivation/narrow_contract.html b/doc/html/motivation/narrow_contract.html
new file mode 100644
index 000000000..48430e457
--- /dev/null
+++ b/doc/html/motivation/narrow_contract.html
@@ -0,0 +1,131 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Narrow contracts - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../motivation/plug_error_code2.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../motivation.html"><img src="../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">Narrow contracts</h1></div></div></div>
+  <p>A program&rsquo;s thread of execution can enter a &ldquo;disappointing&rdquo; state for two reasons:</p>
+
+<ul>
+<li>due to disappointing situation in the environment (operating system, external input),
+or</li>
+<li>due to a bug in the program.</li>
+</ul>
+
+<p>The key to handling these disappointments correctly is to identify to which
+category they belong, and use the tools adequate for a given category. In this
+tutorial when we say &ldquo;error&rdquo; or &ldquo;failure&rdquo; we only refer to the first category.
+A bug is not an error.</p>
+
+<p>A bug is when a program is something else than what it is supposed to be. The
+correct action in that case is to change the program so that it is exactly what
+it is supposed to be. Unfortunately, sometimes the symptoms of a bug are only
+detected when the system is running and at this point no code changes are possible.</p>
+
+<p>In contrast, a failure is when a correct function in a correct program reflects
+some disappointing behavior in the environment. The correct action in that case
+is for the program to take a control path different than usual, which will likely
+cancel some operations and will likely result in different communication with the
+outside world.</p>
+
+<p>Symptoms of bugs can sometimes be detected during compilation or static program
+analysis or at run-time when observing certain values of objects that are declared
+never to be valid at certain points. One classical example is passing a null pointer
+to functions that expect a pointer to a valid object:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">int</span> <span class="nf">f</span><span class="p">(</span><span class="kt">int</span> <span class="o">*</span> <span class="n">pi</span><span class="p">)</span> <span class="c1">// expects: pi != nullptr
+</span><span class="c1"></span><span class="p">{</span>
+  <span class="k">return</span> <span class="o">*</span><span class="n">pi</span> <span class="o">+</span> <span class="mi">1</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div>
+<p>Passing a null pointer where it is not expected is so common a bug that tools
+are very good at finding them. For instance, static analyzers will usually detect
+it without even executing your code. Similarly, tools like undefined behavior
+sanitizers will compile a code as the one above so that a safety check is performed
+to check if the pointer is null, and an error message will be logged and program
+optionally terminated.</p>
+
+<p>More, compilers can perform optimizations based on undefined behavior caused by
+dereferencing a null pointer. In the following code:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">pair</span><span class="o">&lt;</span><span class="kt">int</span><span class="p">,</span> <span class="kt">int</span><span class="o">&gt;</span> <span class="n">g</span><span class="p">(</span><span class="kt">int</span> <span class="o">*</span> <span class="n">pi</span><span class="p">)</span> <span class="c1">// expects: pi != nullptr
+</span><span class="c1"></span><span class="p">{</span>
+  <span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="o">*</span><span class="n">pi</span> <span class="o">+</span> <span class="mi">1</span><span class="p">;</span>
+  <span class="kt">int</span> <span class="n">j</span> <span class="o">=</span> <span class="p">(</span><span class="n">pi</span> <span class="o">==</span> <span class="k">nullptr</span><span class="p">)</span> <span class="o">?</span> <span class="mi">1</span> <span class="o">:</span> <span class="mi">0</span><span class="p">;</span>
+  <span class="k">return</span> <span class="p">{</span><span class="n">i</span><span class="p">,</span> <span class="n">j</span><span class="p">};</span>
+<span class="p">}</span>
+</code></pre></div>
+<p>The compiler can see that if <code>pi</code> is null, the program would have undefined
+behavior. Since undefined behavior is required by the C++ standard to never
+be the programmer&rsquo;s intention, the compiler
+assumes that apparently this function is never called with <code>pi == nullptr</code>. If so,
+<code>j</code> is always <code>0</code> and the code can be transformed to a faster one:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">pair</span><span class="o">&lt;</span><span class="kt">int</span><span class="p">,</span> <span class="kt">int</span><span class="o">&gt;</span> <span class="n">g</span><span class="p">(</span><span class="kt">int</span> <span class="o">*</span> <span class="n">pi</span><span class="p">)</span> <span class="c1">// expects: pi != nullptr
+</span><span class="c1"></span><span class="p">{</span>
+  <span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="o">*</span><span class="n">pi</span> <span class="o">+</span> <span class="mi">1</span><span class="p">;</span>
+  <span class="kt">int</span> <span class="n">j</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
+  <span class="k">return</span> <span class="p">{</span><span class="n">i</span><span class="p">,</span> <span class="n">j</span><span class="p">};</span>
+<span class="p">}</span>
+</code></pre></div>
+<p>Functions like the one above that declare that certain values of input parameters
+must not be passed to them are said to have a <em>narrow contract</em>.</p>
+
+<p>Compilers give you non-standard tools to tell them about narrow contracts, so
+that they can detect it and make use of it the same way as they are detecting
+invalid null pointers. For instance, if a function in your library takes an <code>int</code>
+and declares that the value of this <code>int</code> must never be negative. You can use
+<code>__builtin_trap()</code> available in GCC and clang:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">void</span> <span class="nf">h</span><span class="p">(</span><span class="kt">int</span> <span class="n">i</span><span class="p">)</span> <span class="c1">// expects: i &gt;= 0
+</span><span class="c1"></span><span class="p">{</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">i</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="n">__builtin_trap</span><span class="p">();</span>
+
+  <span class="c1">// normal program logic follows ...
+</span><span class="c1"></span><span class="p">}</span>
+</code></pre></div>
+<p>This instruction when hit, causes the program to exit abnormally, which means:</p>
+
+<ul>
+<li>a debugger can be launched,</li>
+<li>static analyzer can warn you if it can detect a program flow that reaches this
+point,</li>
+<li>UB-sanitizer can log error message when it hits it.</li>
+</ul>
+
+<p>Another tool you could use is <code>__builtin_unreachable()</code>, also available in GCC
+and clang:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">void</span> <span class="nf">h</span><span class="p">(</span><span class="kt">int</span> <span class="n">i</span><span class="p">)</span> <span class="c1">// expects: i &gt;= 0
+</span><span class="c1"></span><span class="p">{</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">i</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="n">__builtin_unreachable</span><span class="p">();</span>
+
+  <span class="c1">// normal program logic follows ...
+</span><span class="c1"></span><span class="p">}</span>
+</code></pre></div>
+<p>This gives a hint to the tools: the programmer guarantees that the program flow
+will never reach to the point of executing it. In other words, it is undefined
+behavior if control reaches this point. Compiler and other tools can take this
+for granted. This way they can deduce that expression <code>i &lt; 0</code> will never be true,
+and they can further use this assumption to issue warnings or to optimize the code.
+UB-sanitizers can use it to inject a log message and terminate if this point is
+nonetheless reached.</p>
+
+<p>Allowing for some input values to be invalid works similarly to cyclic redundancy
+checks. It allows for the possibility to observe the symptoms of the bugs (not
+the bugs themselves), and if the symptom is revealed the hunt for the bug can start.
+This is not only tools that can now easily detect symptoms of bugs, but also
+humans during the code review. A reviewer can now say, &ldquo;hey, function <code>h()</code> is
+expecting a non-negative value, but this <code>i</code> is actually <code>-1</code>; maybe you wanted
+to pass <code>j</code> instead?&ldquo;.</p>
+
+
+        </div><p><small>Last revised: April 26, 2019 at 17:43:41 &#43;0200</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../motivation/plug_error_code2.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../motivation.html"><img src="../images/up.png" alt="Up"></a>
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diff --git a/doc/html/motivation/plug_error_code.html b/doc/html/motivation/plug_error_code.html
new file mode 100644
index 000000000..94ddaf21d
--- /dev/null
+++ b/doc/html/motivation/plug_error_code.html
@@ -0,0 +1,187 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Plugging a library into std::error_code - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../motivation/std_error_code.html"><img src="../images/prev.png" alt="Prev"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">Plugging a library into <code>std::error_code</code></h1></div></div></div>
+  <p><a href="../motivation/plug_error_code2.html">See here for this guide, but for <code>boost::system::error_code</code></a>.</p>
+
+<p>This section illustrates how you can hook into the <code>std::error_code</code> system from
+the Standard Library in order to work with your own set of error codes. As is usually
+the case in C++, doing this is straightforward but requires typing boilerplate
+to tell the C++ STL about your custom error type. This is not part of Outcome library,
+but we still provide this short guide here, because how to do this is not well documented [1].</p>
+
+<p>Suppose you want to report all reasons for failure in converting a <code>std::string</code> to a non-negative <code>int</code>.
+The list is:</p>
+
+<ul>
+<li><code>EmptyString</code> &ndash; the input string is empty,</li>
+<li><code>IllegalChar</code> &ndash; input contains characters that are not digits,</li>
+<li><code>TooLong</code> &ndash; input represents a number, but this number would not fit into a variable of type <code>int</code>.</li>
+</ul>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="cp">#include</span> <span class="cpf">&lt;iostream&gt;</span><span class="cp">
+</span><span class="cp">#include</span> <span class="cpf">&lt;string&gt;        // for string printing</span><span class="cp">
+</span><span class="cp">#include</span> <span class="cpf">&lt;system_error&gt;  // bring in std::error_code et al</span><span class="cp">
+</span><span class="cp"></span>
+<span class="c1">// This is the custom error code enum
+</span><span class="c1"></span><span class="k">enum</span> <span class="k">class</span><span class="err"> </span><span class="nc">ConversionErrc</span>
+<span class="p">{</span>
+  <span class="n">Success</span>     <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="c1">// 0 should not represent an error
+</span><span class="c1"></span>  <span class="n">EmptyString</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
+  <span class="n">IllegalChar</span> <span class="o">=</span> <span class="mi">2</span><span class="p">,</span>
+  <span class="n">TooLong</span>     <span class="o">=</span> <span class="mi">3</span><span class="p">,</span>
+<span class="p">};</span>
+
+<span class="k">namespace</span> <span class="n">std</span>
+<span class="p">{</span>
+  <span class="c1">// Tell the C++ 11 STL metaprogramming that enum ConversionErrc
+</span><span class="c1"></span>  <span class="c1">// is registered with the standard error code system
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;&gt;</span> <span class="k">struct</span> <span class="n">is_error_code_enum</span><span class="o">&lt;</span><span class="n">ConversionErrc</span><span class="o">&gt;</span> <span class="o">:</span> <span class="n">true_type</span>
+  <span class="p">{</span>
+  <span class="p">};</span>
+<span class="p">}</span>
+
+<span class="k">namespace</span> <span class="n">detail</span>
+<span class="p">{</span>
+  <span class="c1">// Define a custom error code category derived from std::error_category
+</span><span class="c1"></span>  <span class="k">class</span><span class="err"> </span><span class="nc">ConversionErrc_category</span> <span class="o">:</span> <span class="k">public</span> <span class="n">std</span><span class="o">::</span><span class="n">error_category</span>
+  <span class="p">{</span>
+  <span class="k">public</span><span class="o">:</span>
+    <span class="c1">// Return a short descriptive name for the category
+</span><span class="c1"></span>    <span class="k">virtual</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">name</span><span class="p">()</span> <span class="k">const</span> <span class="k">noexcept</span> <span class="k">override</span> <span class="k">final</span> <span class="p">{</span> <span class="k">return</span> <span class="s">&#34;ConversionError&#34;</span><span class="p">;</span> <span class="p">}</span>
+    <span class="c1">// Return what each enum means in text
+</span><span class="c1"></span>    <span class="k">virtual</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">message</span><span class="p">(</span><span class="kt">int</span> <span class="n">c</span><span class="p">)</span> <span class="k">const</span> <span class="k">override</span> <span class="k">final</span>
+    <span class="p">{</span>
+      <span class="k">switch</span> <span class="p">(</span><span class="k">static_cast</span><span class="o">&lt;</span><span class="n">ConversionErrc</span><span class="o">&gt;</span><span class="p">(</span><span class="n">c</span><span class="p">))</span>
+      <span class="p">{</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">Success</span><span class="p">:</span>
+        <span class="k">return</span> <span class="s">&#34;conversion successful&#34;</span><span class="p">;</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">EmptyString</span><span class="p">:</span>
+        <span class="k">return</span> <span class="s">&#34;converting empty string&#34;</span><span class="p">;</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">IllegalChar</span><span class="p">:</span>
+        <span class="k">return</span> <span class="s">&#34;got non-digit char when converting to a number&#34;</span><span class="p">;</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">TooLong</span><span class="p">:</span>
+        <span class="k">return</span> <span class="s">&#34;the number would not fit into memory&#34;</span><span class="p">;</span>
+      <span class="k">default</span><span class="o">:</span>
+        <span class="k">return</span> <span class="s">&#34;unknown&#34;</span><span class="p">;</span>
+      <span class="p">}</span>
+    <span class="p">}</span>
+    <span class="c1">// OPTIONAL: Allow generic error conditions to be compared to me
+</span><span class="c1"></span>    <span class="k">virtual</span> <span class="n">std</span><span class="o">::</span><span class="n">error_condition</span> <span class="n">default_error_condition</span><span class="p">(</span><span class="kt">int</span> <span class="n">c</span><span class="p">)</span> <span class="k">const</span> <span class="k">noexcept</span> <span class="k">override</span> <span class="k">final</span>
+    <span class="p">{</span>
+      <span class="k">switch</span> <span class="p">(</span><span class="k">static_cast</span><span class="o">&lt;</span><span class="n">ConversionErrc</span><span class="o">&gt;</span><span class="p">(</span><span class="n">c</span><span class="p">))</span>
+      <span class="p">{</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">EmptyString</span><span class="p">:</span>
+        <span class="k">return</span> <span class="n">make_error_condition</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">);</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">IllegalChar</span><span class="p">:</span>
+        <span class="k">return</span> <span class="n">make_error_condition</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">);</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">TooLong</span><span class="p">:</span>
+        <span class="k">return</span> <span class="n">make_error_condition</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">result_out_of_range</span><span class="p">);</span>
+      <span class="k">default</span><span class="o">:</span>
+        <span class="c1">// I have no mapping for this code
+</span><span class="c1"></span>        <span class="k">return</span> <span class="n">std</span><span class="o">::</span><span class="n">error_condition</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="o">*</span><span class="k">this</span><span class="p">);</span>
+      <span class="p">}</span>
+    <span class="p">}</span>
+  <span class="p">};</span>
+<span class="p">}</span>
+
+<span class="c1">// Define the linkage for this function to be used by external code.
+</span><span class="c1">// This would be the usual __declspec(dllexport) or __declspec(dllimport)
+</span><span class="c1">// if we were in a Windows DLL etc. But for this example use a global
+</span><span class="c1">// instance but with inline linkage so multiple definitions do not collide.
+</span><span class="c1"></span><span class="cp">#define THIS_MODULE_API_DECL extern inline
+</span><span class="cp"></span>
+<span class="c1">// Declare a global function returning a static instance of the custom category
+</span><span class="c1"></span><span class="n">THIS_MODULE_API_DECL</span> <span class="k">const</span> <span class="n">detail</span><span class="o">::</span><span class="n">ConversionErrc_category</span> <span class="o">&amp;</span><span class="n">ConversionErrc_category</span><span class="p">()</span>
+<span class="p">{</span>
+  <span class="k">static</span> <span class="n">detail</span><span class="o">::</span><span class="n">ConversionErrc_category</span> <span class="n">c</span><span class="p">;</span>
+  <span class="k">return</span> <span class="n">c</span><span class="p">;</span>
+<span class="p">}</span>
+
+
+<span class="c1">// Overload the global make_error_code() free function with our
+</span><span class="c1">// custom enum. It will be found via ADL by the compiler if needed.
+</span><span class="c1"></span><span class="kr">inline</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span> <span class="n">make_error_code</span><span class="p">(</span><span class="n">ConversionErrc</span> <span class="n">e</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">return</span> <span class="p">{</span><span class="k">static_cast</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="p">(</span><span class="n">e</span><span class="p">),</span> <span class="n">ConversionErrc_category</span><span class="p">()};</span>
+<span class="p">}</span>
+
+<span class="kt">int</span> <span class="n">main</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="c1">// Note that we can now supply ConversionErrc directly to error_code
+</span><span class="c1"></span>  <span class="n">std</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span> <span class="o">=</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="n">IllegalChar</span><span class="p">;</span>
+
+  <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;ConversionErrc::IllegalChar is printed by std::error_code as &#34;</span>
+    <span class="o">&lt;&lt;</span> <span class="n">ec</span> <span class="o">&lt;&lt;</span> <span class="s">&#34; with explanatory message &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+
+  <span class="c1">// We can compare ConversionErrc containing error codes to generic conditions
+</span><span class="c1"></span>  <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;ec is equivalent to std::errc::invalid_argument = &#34;</span>
+    <span class="o">&lt;&lt;</span> <span class="p">(</span><span class="n">ec</span> <span class="o">==</span> <span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;ec is equivalent to std::errc::result_out_of_range = &#34;</span>
+    <span class="o">&lt;&lt;</span> <span class="p">(</span><span class="n">ec</span> <span class="o">==</span> <span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">result_out_of_range</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/error_code_registration.cpp#L32" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>This might look like a lot of extra boilerplate over simply using your custom
+error code enum directly, but look at the advantages:</p>
+
+<ol>
+<li>Any code which can speak <code>std::error_code</code> can now work with errors from your
+code, AND without being recompiled.</li>
+<li><code>std::system_error</code> can now wrap your custom error codes seamlessly, allowing
+your custom error code to be converted into a C++ exception <em>and back out again</em>
+without losing information.</li>
+<li><code>std::error_code</code> knows how to print itself, and will print your custom error
+code without extra work from you. As usually you&rsquo;d need to define a print routine
+for any custom error code you&rsquo;d write anyway, there is actually very little extra
+boilerplate here.</li>
+<li>If you implement the <code>default_error_condition()</code> override, you can allow code
+exclusively written to understand <code>std::errc</code> alone to examine your custom error
+code domain for equivalence to the standard error conditions, AND without being
+recompiled.</li>
+</ol>
+
+<div class="notices note" style="background: url('../images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>This documentation recommends that when you define your custom <code>enum</code> for representing
+<code>error_code</code>s, you should always make sure that value 0 never represents an actual error:
+it should either represent a success or should not be provided at all. If you only
+intend to use your <code>enum</code> inside <code>result&lt;&gt;</code> or <code>outcome&lt;&gt;</code> you can just start your
+enumerations from 1. If you intend to also return <code>std::error_code</code> directly from
+functions, you should probably define value 0 as success, so that you are able to
+inform about function&rsquo;s success by returning <code>MyEnum::Success</code>. This is because <code>error_code</code>&rsquo;s
+contextual conversion to <code>bool</code> (which some people use to check if there was an error or not)
+only checks for the numeric value of the error code (without looking at error domain (category)).</p>
+</div>
+</div>
+
+
+<p>[1]: The only documentation I&rsquo;m aware of is the quite old guide by Chris Kohlhoff, founder of ASIO and the Networking TS:</p>
+
+<ul>
+<li><a href="http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-1.html">http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-1.html</a></li>
+<li><a href="http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-2.html">http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-2.html</a></li>
+<li><a href="http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-3.html">http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-3.html</a></li>
+<li><a href="http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-4.html">http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-4.html</a></li>
+<li><a href="http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-5.html">http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-5.html</a></li>
+</ul>
+
+
+        </div><p><small>Last revised: September 10, 2021 at 11:56:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../motivation/std_error_code.html"><img src="../images/prev.png" alt="Prev"></a>
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+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Plugging a library into boost::system::error_code - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+  <div class="titlepage"><div><div><h1 style="clear: both">Plugging a library into <code>boost::system::error_code</code></h1></div></div></div>
+  <p><a href="../motivation/plug_error_code.html">See here for this guide, but for <code>std::error_code</code></a>.</p>
+
+<p>This section illustrates how you can hook into the <code>boost::system::error_code</code> system from
+the Boost in order to work with your own set of error codes. As is usually
+the case in C++, doing this is straightforward but requires typing boilerplate
+to tell Boost.System about your custom error type. This is not part of Outcome library,
+but we still provide this short guide here, because how to do this is not well documented [1].</p>
+
+<p>Suppose you want to report all reasons for failure in converting a <code>std::string</code> to a non-negative <code>int</code>.
+The list is:</p>
+
+<ul>
+<li><code>EmptyString</code> &ndash; the input string is empty,</li>
+<li><code>IllegalChar</code> &ndash; input contains characters that are not digits,</li>
+<li><code>TooLong</code> &ndash; input represents a number, but this number would not fit into a variable of type <code>int</code>.</li>
+</ul>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="cp">#include</span> <span class="cpf">&lt;boost/system/error_code.hpp&gt;  // bring in boost::system::error_code et al</span><span class="cp">
+</span><span class="cp">#include</span> <span class="cpf">&lt;iostream&gt;</span><span class="cp">
+</span><span class="cp">#include</span> <span class="cpf">&lt;string&gt;  // for string printing</span><span class="cp">
+</span><span class="cp"></span>
+<span class="c1">// This is the custom error code enum
+</span><span class="c1"></span><span class="k">enum</span> <span class="k">class</span><span class="err"> </span><span class="nc">ConversionErrc</span>
+<span class="p">{</span>
+  <span class="n">Success</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span>  <span class="c1">// 0 should not represent an error
+</span><span class="c1"></span>  <span class="n">EmptyString</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
+  <span class="n">IllegalChar</span> <span class="o">=</span> <span class="mi">2</span><span class="p">,</span>
+  <span class="n">TooLong</span> <span class="o">=</span> <span class="mi">3</span><span class="p">,</span>
+<span class="p">};</span>
+
+<span class="k">namespace</span> <span class="n">boost</span>
+<span class="p">{</span>
+  <span class="k">namespace</span> <span class="n">system</span>
+  <span class="p">{</span>
+    <span class="c1">// Tell the C++ 11 STL metaprogramming that enum ConversionErrc
+</span><span class="c1"></span>    <span class="c1">// is registered with the standard error code system
+</span><span class="c1"></span>    <span class="k">template</span> <span class="o">&lt;&gt;</span> <span class="k">struct</span> <span class="n">is_error_code_enum</span><span class="o">&lt;</span><span class="n">ConversionErrc</span><span class="o">&gt;</span> <span class="o">:</span> <span class="n">std</span><span class="o">::</span><span class="n">true_type</span>
+    <span class="p">{</span>
+    <span class="p">};</span>
+  <span class="p">}</span>  <span class="c1">// namespace system
+</span><span class="c1"></span><span class="p">}</span>  <span class="c1">// namespace boost
+</span><span class="c1"></span>
+<span class="k">namespace</span> <span class="n">detail</span>
+<span class="p">{</span>
+  <span class="c1">// Define a custom error code category derived from boost::system::error_category
+</span><span class="c1"></span>  <span class="k">class</span><span class="err"> </span><span class="nc">ConversionErrc_category</span> <span class="o">:</span> <span class="k">public</span> <span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_category</span>
+  <span class="p">{</span>
+  <span class="k">public</span><span class="o">:</span>
+    <span class="c1">// Return a short descriptive name for the category
+</span><span class="c1"></span>    <span class="k">virtual</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">name</span><span class="p">()</span> <span class="k">const</span> <span class="k">noexcept</span> <span class="k">override</span> <span class="k">final</span> <span class="p">{</span> <span class="k">return</span> <span class="s">&#34;ConversionError&#34;</span><span class="p">;</span> <span class="p">}</span>
+    <span class="c1">// Return what each enum means in text
+</span><span class="c1"></span>    <span class="k">virtual</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">message</span><span class="p">(</span><span class="kt">int</span> <span class="n">c</span><span class="p">)</span> <span class="k">const</span> <span class="k">override</span> <span class="k">final</span>
+    <span class="p">{</span>
+      <span class="k">switch</span><span class="p">(</span><span class="k">static_cast</span><span class="o">&lt;</span><span class="n">ConversionErrc</span><span class="o">&gt;</span><span class="p">(</span><span class="n">c</span><span class="p">))</span>
+      <span class="p">{</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">Success</span><span class="p">:</span>
+        <span class="k">return</span> <span class="s">&#34;conversion successful&#34;</span><span class="p">;</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">EmptyString</span><span class="p">:</span>
+        <span class="k">return</span> <span class="s">&#34;converting empty string&#34;</span><span class="p">;</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">IllegalChar</span><span class="p">:</span>
+        <span class="k">return</span> <span class="s">&#34;got non-digit char when converting to a number&#34;</span><span class="p">;</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">TooLong</span><span class="p">:</span>
+        <span class="k">return</span> <span class="s">&#34;the number would not fit into memory&#34;</span><span class="p">;</span>
+      <span class="k">default</span><span class="o">:</span>
+        <span class="k">return</span> <span class="s">&#34;unknown&#34;</span><span class="p">;</span>
+      <span class="p">}</span>
+    <span class="p">}</span>
+    <span class="c1">// OPTIONAL: Allow generic error conditions to be compared to me
+</span><span class="c1"></span>    <span class="k">virtual</span> <span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_condition</span> <span class="n">default_error_condition</span><span class="p">(</span><span class="kt">int</span> <span class="n">c</span><span class="p">)</span> <span class="k">const</span> <span class="k">noexcept</span> <span class="k">override</span> <span class="k">final</span>
+    <span class="p">{</span>
+      <span class="k">switch</span><span class="p">(</span><span class="k">static_cast</span><span class="o">&lt;</span><span class="n">ConversionErrc</span><span class="o">&gt;</span><span class="p">(</span><span class="n">c</span><span class="p">))</span>
+      <span class="p">{</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">EmptyString</span><span class="p">:</span>
+        <span class="k">return</span> <span class="n">make_error_condition</span><span class="p">(</span><span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">);</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">IllegalChar</span><span class="p">:</span>
+        <span class="k">return</span> <span class="n">make_error_condition</span><span class="p">(</span><span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">);</span>
+      <span class="k">case</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="nl">TooLong</span><span class="p">:</span>
+        <span class="k">return</span> <span class="n">make_error_condition</span><span class="p">(</span><span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">result_out_of_range</span><span class="p">);</span>
+      <span class="k">default</span><span class="o">:</span>
+        <span class="c1">// I have no mapping for this code
+</span><span class="c1"></span>        <span class="k">return</span> <span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_condition</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="o">*</span><span class="k">this</span><span class="p">);</span>
+      <span class="p">}</span>
+    <span class="p">}</span>
+  <span class="p">};</span>
+<span class="p">}</span>  <span class="c1">// namespace detail
+</span><span class="c1"></span>
+<span class="c1">// Define the linkage for this function to be used by external code.
+</span><span class="c1">// This would be the usual __declspec(dllexport) or __declspec(dllimport)
+</span><span class="c1">// if we were in a Windows DLL etc. But for this example use a global
+</span><span class="c1">// instance but with inline linkage so multiple definitions do not collide.
+</span><span class="c1"></span><span class="cp">#define THIS_MODULE_API_DECL extern inline
+</span><span class="cp"></span>
+<span class="c1">// Declare a global function returning a static instance of the custom category
+</span><span class="c1"></span><span class="n">THIS_MODULE_API_DECL</span> <span class="k">const</span> <span class="n">detail</span><span class="o">::</span><span class="n">ConversionErrc_category</span> <span class="o">&amp;</span><span class="n">ConversionErrc_category</span><span class="p">()</span>
+<span class="p">{</span>
+  <span class="k">static</span> <span class="n">detail</span><span class="o">::</span><span class="n">ConversionErrc_category</span> <span class="n">c</span><span class="p">;</span>
+  <span class="k">return</span> <span class="n">c</span><span class="p">;</span>
+<span class="p">}</span>
+
+
+<span class="c1">// Overload the global make_error_code() free function with our
+</span><span class="c1">// custom enum. It will be found via ADL by the compiler if needed.
+</span><span class="c1"></span><span class="kr">inline</span> <span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">make_error_code</span><span class="p">(</span><span class="n">ConversionErrc</span> <span class="n">e</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">return</span> <span class="p">{</span><span class="k">static_cast</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="p">(</span><span class="n">e</span><span class="p">),</span> <span class="n">ConversionErrc_category</span><span class="p">()};</span>
+<span class="p">}</span>
+
+<span class="kt">int</span> <span class="n">main</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="c1">// Note that we can now supply ConversionErrc directly to error_code
+</span><span class="c1"></span>  <span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span> <span class="o">=</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="n">IllegalChar</span><span class="p">;</span>
+
+  <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;ConversionErrc::IllegalChar is printed by boost::system::error_code as &#34;</span>
+    <span class="o">&lt;&lt;</span> <span class="n">ec</span> <span class="o">&lt;&lt;</span> <span class="s">&#34; with explanatory message &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+
+  <span class="c1">// We can compare ConversionErrc containing error codes to generic conditions
+</span><span class="c1"></span>  <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;ec is equivalent to boost::system::errc::invalid_argument = &#34;</span>
+    <span class="o">&lt;&lt;</span> <span class="p">(</span><span class="n">ec</span> <span class="o">==</span> <span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;ec is equivalent to boost::system::errc::result_out_of_range = &#34;</span>
+    <span class="o">&lt;&lt;</span> <span class="p">(</span><span class="n">ec</span> <span class="o">==</span> <span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">result_out_of_range</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/error_code_registration.cpp#L32" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>This might look like a lot of extra boilerplate over simply using your custom
+error code enum directly, but look at the advantages:</p>
+
+<ol>
+<li>Any code which can speak <code>boost::system::error_code</code> can now work with errors from your
+code, AND without being recompiled.</li>
+<li><code>boost::system::system_error</code> can now wrap your custom error codes seamlessly, allowing
+your custom error code to be converted into a C++ exception <em>and back out again</em>
+without losing information.</li>
+<li><code>boost::system::error_code</code> knows how to print itself, and will print your custom error
+code without extra work from you. As usually you&rsquo;d need to define a print routine
+for any custom error code you&rsquo;d write anyway, there is actually very little extra
+boilerplate here.</li>
+<li>If you implement the <code>default_error_condition()</code> override, you can allow code
+exclusively written to understand <code>boost::system::errc</code> alone to examine your custom error
+code domain for equivalence to the standard error conditions, AND without being
+recompiled.</li>
+</ol>
+
+<div class="notices note" style="background: url('../images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>This documentation recommends that when you define your custom <code>enum</code> for representing
+<code>error_code</code>s, you should always make sure that value 0 never represents an actual error:
+it should either represent a success or should not be provided at all. If you only
+intend to use your <code>enum</code> inside <code>result&lt;&gt;</code> or <code>outcome&lt;&gt;</code> you can just start your
+enumerations from 1. If you intend to also return <code>boost::system::error_code</code> directly from
+functions, you should probably define value 0 as success, so that you are able to
+inform about function&rsquo;s success by returning <code>MyEnum::Success</code>. This is because <code>error_code</code>&rsquo;s
+contextual conversion to <code>bool</code> (which some people use to check if there was an error or not)
+only checks for the numeric value of the error code (without looking at error domain (category)).</p>
+</div>
+</div>
+
+
+<p>[1]: The only documentation I&rsquo;m aware of is the quite old guide by Chris Kohlhoff, founder of ASIO and the Networking TS:</p>
+
+<ul>
+<li><a href="http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-1.html">http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-1.html</a></li>
+<li><a href="http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-2.html">http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-2.html</a></li>
+<li><a href="http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-3.html">http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-3.html</a></li>
+<li><a href="http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-4.html">http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-4.html</a></li>
+<li><a href="http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-5.html">http://blog.think-async.com/2010/04/system-error-support-in-c0x-part-5.html</a></li>
+</ul>
+
+
+        </div><p><small>Last revised: September 10, 2021 at 11:56:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../motivation/plug_error_code.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../motivation.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../motivation/narrow_contract.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/motivation/std_error_code.html b/doc/html/motivation/std_error_code.html
new file mode 100644
index 000000000..ac6038fa6
--- /dev/null
+++ b/doc/html/motivation/std_error_code.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std::error_code - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../motivation/error_codes.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../motivation.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../motivation/plug_error_code.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">std::error_code</h1></div></div></div>
+  <p>Type <code>std::error_code</code> has been designed to be sufficiently small and trivial
+to be cheaply passed around, and at the same time be able to store sufficient
+information to represent any error situation from any library/sub-system in the
+world without a clash. Its representation is basically:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">class</span><span class="err"> </span><span class="nc">error_code</span>
+<span class="p">{</span>
+  <span class="n">error_category</span><span class="o">*</span> <span class="n">domain</span><span class="p">;</span> <span class="c1">// domain from which the error originates
+</span><span class="c1"></span>  <span class="kt">int</span>             <span class="n">value</span><span class="p">;</span>  <span class="c1">// numeric value of error within the domain
+</span><span class="c1"></span><span class="p">};</span>
+</code></pre></div>
+<p>Here, <code>domain</code> indicates the library from which the error originates. It is a
+pointer to a global object representing a given library/domain. Different
+libraries will be represented by different pointers to different globals.
+Each domain is expected to be represented by a global object derived from
+<code>std::error_category</code>. The uniqueness of the domain pointer value is guaranteed
+by the uniqueness of addresses of different global objects.</p>
+
+<p>Now, <code>value</code> represents a numeric value of a particular error situation within
+the domain. Thus, different domains can use the same numeric value <code>1</code> to
+indicate different error situations, but two <code>std::error_code</code> objects will be
+different because the pointers representing domains will be different.</p>
+
+<p><code>std::error_code</code> comes with additional tools: a facility for defining custom
+domains with their set of error codes, and a facility for building predicates
+that allow classifying errors.</p>
+
+<p>Once created and passed around (either inside a thrown exception or returned from functions by value) there is never a need to change the value of <code>error_code</code>
+object at any level. But at different levels one can use different predicates
+for classifying error situations appropriately to the program layer.</p>
+
+<p>When a new library needs to represent its own set of error situations in an
+<code>error_code</code> it first has to declare the list of numeric value as an enumeration:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">enum</span> <span class="k">class</span><span class="err"> </span><span class="nc">ConvertErrc</span>
+<span class="p">{</span>
+  <span class="n">StringTooLong</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="c1">// 0 should not represent an error
+</span><span class="c1"></span>  <span class="n">EmptyString</span>   <span class="o">=</span> <span class="mi">2</span><span class="p">,</span>
+  <span class="n">IllegalChar</span>   <span class="o">=</span> <span class="mi">3</span><span class="p">,</span>
+<span class="p">};</span>
+</code></pre></div>
+<p>Then it has to put some boiler-plate code to plug the new enumeration into the
+<code>std::error_code</code> system. Then, it can use the enum as an <code>error_code</code>:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">std</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span> <span class="o">=</span> <span class="n">ConvertErrc</span><span class="o">::</span><span class="n">EmptyString</span><span class="p">;</span>
+<span class="n">assert</span><span class="p">(</span><span class="n">ec</span> <span class="o">==</span> <span class="n">ConvertErrc</span><span class="o">::</span><span class="n">EmptyString</span><span class="p">);</span>
+</code></pre></div>
+<p>Member <code>value</code> is mapped directly from the numeric value in the enumeration, and
+member <code>domain</code> is mapped from the type of the enumeration. Thus, this is a form
+of type erasure, but one that does allow type <code>std::error_code</code> to be trivial
+and standard-layout.</p>
+
+
+        </div><p><small>Last revised: January 16, 2019 at 01:05:39 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../motivation/error_codes.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../motivation.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../motivation/plug_error_code.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/recipes.html b/doc/html/recipes.html
new file mode 100644
index 000000000..e76b3f1cf
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+++ b/doc/html/recipes.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Recipes - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="./tutorial/advanced/interop/conclusion.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./recipes/asio-integration.html"><img src="./images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Recipes</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="./recipes/asio-integration.html" >ASIO/Networking TS : Boost &lt; 1.70</a>
+<p>How to teach ASIO/Networking TS about Outcome.</p><li>
+	<a href="./recipes/asio-integration-1-70.html" >ASIO/Networking TS: Boost &gt;= 1.70</a>
+<p>How to teach ASIO/Networking TS about Outcome.</p><li>
+	<a href="./recipes/foreign-try.html" >Extending <code>BOOST_OUTCOME_TRY</code></a>
+<p>How to informing <code>BOOST_OUTCOME_TRY</code> about foreign Result types.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./tutorial/advanced/interop/conclusion.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./recipes/asio-integration.html"><img src="./images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/recipes/asio-integration-1-70.html b/doc/html/recipes/asio-integration-1-70.html
new file mode 100644
index 000000000..7c8120ed3
--- /dev/null
+++ b/doc/html/recipes/asio-integration-1-70.html
@@ -0,0 +1,294 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>ASIO/Networking TS: Boost &gt;= 1.70 - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../recipes/asio-integration.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../recipes.html"><img src="../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">ASIO/Networking TS: Boost &gt;= 1.70</h1></div></div></div>
+  <div class="toc"><dl class="toc">
+<dt>
+<dd><dl>
+<dt>
+<dd><dl>
+<dt><a href="#compatibility-note">Compatibility note</a></dt>
+<dt><a href="#use-case">Use case</a></dt>
+<dt><a href="#implementation">Implementation</a></dt>
+</dl></dd></dt>
+</dl></dd></dt>
+</dl>
+  </div>
+  
+
+<p><em>Thanks to <a href="https://github.com/cstratopoulos">Christos Stratopoulos</a> for this Outcome recipe.</em></p>
+
+<hr />
+
+<h3 id="compatibility-note">Compatibility note</h3>
+
+<p>This recipe targets Boost versions including and after 1.70, where coroutine support is
+based around the <code>asio::use_awaitable</code> completion token. For integration with Boost versions
+before 1.70, see <a href="asio-integration">this recipe</a>.</p>
+
+<hr />
+
+<h3 id="use-case">Use case</h3>
+
+<p><a href="https://www.boost.org/doc/libs/develop/doc/html/boost_asio.html">Boost.ASIO</a>
+and <a href="https://think-async.com/Asio/">standalone ASIO</a> provide the
+<a href="https://www.boost.org/doc/libs/develop/doc/html/boost_asio/reference/async_result.html"><code>async_result</code></a>
+customisation point for adapting arbitrary third party libraries, such as Outcome, into ASIO.</p>
+
+<p>Historically in ASIO you need to pass completion handler instances
+to the ASIO asynchronous i/o initiation functions. These get executed when the i/o
+completes.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// Dynamically allocate a buffer to read into. This must be move-only
+</span><span class="c1"></span>  <span class="c1">// so it can be attached to the completion handler, hence the unique_ptr.
+</span><span class="c1"></span>  <span class="k">auto</span> <span class="n">buffer</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">make_unique</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o">&lt;</span><span class="n">byte</span><span class="o">&gt;&gt;</span><span class="p">(</span><span class="mi">1024</span><span class="p">);</span>
+
+  <span class="c1">// Begin an asynchronous socket read, upon completion invoke
+</span><span class="c1"></span>  <span class="c1">// the lambda function specified
+</span><span class="c1"></span>  <span class="n">skt</span><span class="p">.</span><span class="n">async_read_some</span><span class="p">(</span><span class="n">asio</span><span class="o">::</span><span class="n">buffer</span><span class="p">(</span><span class="n">buffer</span><span class="o">-&gt;</span><span class="n">data</span><span class="p">(),</span> <span class="n">buffer</span><span class="o">-&gt;</span><span class="n">size</span><span class="p">()),</span>
+
+                      <span class="c1">// Retain lifetime of the i/o buffer until completion
+</span><span class="c1"></span>                      <span class="p">[</span><span class="n">buffer</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">buffer</span><span class="p">)](</span><span class="k">const</span> <span class="n">error_code</span> <span class="o">&amp;</span><span class="n">ec</span><span class="p">,</span> <span class="n">size_t</span> <span class="n">bytes</span><span class="p">)</span> <span class="p">{</span>
+                        <span class="c1">// Handle the buffer read
+</span><span class="c1"></span>                        <span class="k">if</span><span class="p">(</span><span class="n">ec</span><span class="p">)</span>
+                        <span class="p">{</span>
+                          <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Buffer read failed with &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">ec</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+                          <span class="k">return</span><span class="p">;</span>
+                        <span class="p">}</span>
+                        <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Read &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">bytes</span> <span class="o">&lt;&lt;</span> <span class="s">&#34; bytes into buffer&#34;</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+
+                        <span class="c1">// buffer will be dynamically freed now
+</span><span class="c1"></span>                      <span class="p">});</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration_1_70.cpp#L48" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>One of the big value adds of the Coroutines TS is the ability to not have to write
+so much boilerplate if you have a Coroutines supporting compiler:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// As coroutines suspend the calling thread whilst an asynchronous
+</span><span class="c1"></span>  <span class="c1">// operation executes, we can use stack allocation instead of dynamic
+</span><span class="c1"></span>  <span class="c1">// allocation
+</span><span class="c1"></span>  <span class="kt">char</span> <span class="n">buffer</span><span class="p">[</span><span class="mi">1024</span><span class="p">];</span>
+
+  <span class="c1">// Asynchronously read data, suspending this coroutine until completion,
+</span><span class="c1"></span>  <span class="c1">// returning the bytes of the data read into the result.
+</span><span class="c1"></span>  <span class="k">try</span>
+  <span class="p">{</span>
+    <span class="c1">// The use_awaitable completion token represents the current coroutine
+</span><span class="c1"></span>    <span class="c1">// (requires Coroutines TS)
+</span><span class="c1"></span>    <span class="n">size_t</span> <span class="n">bytesread</span> <span class="o">=</span>  <span class="c1">//
+</span><span class="c1"></span>    <span class="n">co_await</span> <span class="n">skt</span><span class="p">.</span><span class="n">async_read_some</span><span class="p">(</span><span class="n">asio</span><span class="o">::</span><span class="n">buffer</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">asio</span><span class="o">::</span><span class="n">use_awaitable</span><span class="p">);</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Read &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">bytesread</span> <span class="o">&lt;&lt;</span> <span class="s">&#34; bytes into buffer&#34;</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="k">catch</span><span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">system_error</span> <span class="o">&amp;</span><span class="n">e</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Buffer read failed with &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">e</span><span class="p">.</span><span class="n">what</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration_1_70.cpp#L74" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The default ASIO implementation always throws exceptions on failure through
+its coroutine token transformation. The <a href="https://www.boost.org/doc/libs/develop/doc/html/boost_asio/reference/experimental__redirect_error.html"><code>redirect_error</code></a>
+token transformation recovers the option to use the <code>error_code</code> interface,
+but it suffers from the <a href="../motivation/error_codes.html">same drawbacks</a>
+that make pure error codes unappealing in the synchronous case.</p>
+
+<p>This recipe fixes that by making it possible for coroutinised
+i/o in ASIO to return a <code>result&lt;T&gt;</code>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// Asynchronously read data, suspending this coroutine until completion,
+</span><span class="c1"></span>  <span class="c1">// returning the bytes of the data read into the result, or any failure.
+</span><span class="c1"></span>  <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">size_t</span><span class="p">,</span> <span class="n">error_code</span><span class="o">&gt;</span> <span class="n">bytesread</span> <span class="o">=</span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="n">co_await</span> <span class="n">skt</span><span class="p">.</span><span class="n">async_read_some</span><span class="p">(</span><span class="n">asio</span><span class="o">::</span><span class="n">buffer</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">as_result</span><span class="p">(</span><span class="n">asio</span><span class="o">::</span><span class="n">use_awaitable</span><span class="p">));</span>
+
+  <span class="c1">// Usage is exactly like ordinary Outcome. Note the lack of exception throw!
+</span><span class="c1"></span>  <span class="k">if</span><span class="p">(</span><span class="n">bytesread</span><span class="p">.</span><span class="n">has_error</span><span class="p">())</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Buffer read failed with &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">bytesread</span><span class="p">.</span><span class="n">error</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+    <span class="k">return</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Read &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">bytesread</span><span class="p">.</span><span class="n">value</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="s">&#34; bytes into buffer&#34;</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration_1_70.cpp#L208" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<hr />
+
+<h3 id="implementation">Implementation</h3>
+
+<div class="notices warning" style="background: url('../images/warning.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">warning</div>
+<div class="notices message"><p>The below involves a lot of ASIO voodoo. <strong>NO SUPPORT WILL BE GIVEN HERE FOR THE ASIO
+CODE BELOW</strong>. Please raise any questions or problems that you have with how to implement
+this sort of stuff in ASIO
+on <a href="https://stackoverflow.com/questions/tagged/boost-asio">Stackoverflow #boost-asio</a>.</p>
+</div>
+</div>
+
+
+<p>The real world, production-level recipe can be found at the bottom of this page.
+You ought to use that in any real world use case.</p>
+
+<p>It is however worth providing a walkthrough of a simplified edition of the real world
+recipe, as a lot of barely documented ASIO voodoo is involved. You should not
+use the code presented next in your own code, it is too simplified. But it should
+help you understand how the real implementation works.</p>
+
+<p>Firstly we need to define some helper type sugar and a factory function for wrapping
+any arbitrary third party completion token with that type sugar:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">detail</span>
+<span class="p">{</span>
+  <span class="c1">// Type sugar for wrapping an external completion token
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">CompletionToken</span><span class="o">&gt;</span> <span class="k">struct</span> <span class="n">as_result_t</span>
+  <span class="p">{</span>
+    <span class="n">CompletionToken</span> <span class="n">token</span><span class="p">;</span>
+  <span class="p">};</span>
+<span class="p">}</span>  <span class="c1">// namespace detail
+</span><span class="c1"></span>
+<span class="c1">// Factory function for wrapping a third party completion token with
+</span><span class="c1">// our type sugar
+</span><span class="c1"></span><span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">CompletionToken</span><span class="o">&gt;</span>  <span class="c1">//
+</span><span class="c1"></span><span class="kr">inline</span> <span class="k">auto</span> <span class="n">as_result</span><span class="p">(</span><span class="n">CompletionToken</span> <span class="o">&amp;&amp;</span><span class="n">token</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">return</span> <span class="n">detail</span><span class="o">::</span><span class="n">as_result_t</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">decay_t</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="o">&gt;&gt;</span><span class="p">{</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="o">&gt;</span><span class="p">(</span><span class="n">token</span><span class="p">)};</span>
+<span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration_1_70.cpp#L97" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Next we tell ASIO about a new completion token it ought to recognise by specialising
+<a href="https://www.boost.org/doc/libs/develop/doc/html/boost_asio/reference/async_result.html"><code>async_result</code></a>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// Tell ASIO about a new kind of completion token, the kind returned
+</span><span class="c1">// from our as_result() factory function. This implementation is
+</span><span class="c1">// for functions with handlers void(error_code, T) only.
+</span><span class="c1"></span><span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">CompletionToken</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span>                        <span class="c1">//
+</span><span class="c1"></span><span class="k">struct</span> <span class="n">asio</span><span class="o">::</span><span class="n">async_result</span><span class="o">&lt;</span><span class="n">detail</span><span class="o">::</span><span class="n">as_result_t</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="o">&gt;</span><span class="p">,</span>  <span class="c1">//
+</span><span class="c1"></span>                          <span class="kt">void</span><span class="p">(</span><span class="n">error_code</span><span class="p">,</span> <span class="n">T</span><span class="p">)</span><span class="o">&gt;</span>                   <span class="c1">//
+</span><span class="c1"></span>
+<span class="p">{</span>
+  <span class="c1">// The result type we shall return
+</span><span class="c1"></span>  <span class="k">using</span> <span class="n">result_type</span> <span class="o">=</span> <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">error_code</span><span class="o">&gt;</span><span class="p">;</span>
+  <span class="c1">// The awaitable type to be returned by the initiating function,
+</span><span class="c1"></span>  <span class="c1">// the co_await of which will yield a result_type
+</span><span class="c1"></span>  <span class="k">using</span> <span class="n">return_type</span> <span class="o">=</span> <span class="c1">//
+</span><span class="c1"></span>  <span class="k">typename</span> <span class="n">asio</span><span class="o">::</span><span class="n">async_result</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="p">,</span> <span class="kt">void</span><span class="p">(</span><span class="n">result_type</span><span class="p">)</span><span class="o">&gt;</span> <span class="c1">//
+</span><span class="c1"></span>  <span class="o">::</span><span class="n">return_type</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration_1_70.cpp#L116" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>There are a couple tricky parts to understand. First of all, we want our
+<code>async_result</code> specialization to work, in particular, with the <code>async_result</code> for
+ASIO&rsquo;s
+<a href="https://www.boost.org/doc/libs/develop/doc/html/boost_asio/reference/use_awaitable_t.html"><code>use_awaitable_t</code> completion token</a>.
+With this token, the <code>async_result</code> specialization takes the form with a static
+<code>initiate</code> method which defers initiation of the asynchronous operation until,
+for example,
+<code>co_await</code> is called on the returned <code>awaitable</code>. Thus, our <code>async_result</code>
+specialization will take the same form. With this in mind, we need only
+understand how our specialization will implement its <code>initiate</code> method. The trick
+is that it will pass the initiation work off to an <code>async_result</code> for the
+supplied completion token type with a completion handler which consumes <code>result&lt;T&gt;</code>.
+Our <code>async_result</code> is thus just a simple wrapper over this underlying
+<code>async_result</code>, but we inject a completion handler with the
+<code>void(error_code, size_t)</code> signature which constructs from that a <code>result</code>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// Wrap a completion handler with void(error_code, T) converting
+</span><span class="c1"></span>  <span class="c1">// handler
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">Handler</span><span class="o">&gt;</span>
+  <span class="k">struct</span> <span class="n">completion_handler</span> <span class="p">{</span>
+    <span class="c1">// Our completion handler spec
+</span><span class="c1"></span>    <span class="kt">void</span> <span class="k">operator</span><span class="p">()(</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">,</span> <span class="n">T</span> <span class="n">v</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="c1">// Call the underlying completion handler, whose
+</span><span class="c1"></span>      <span class="c1">// completion function is void(result_type)
+</span><span class="c1"></span>      <span class="k">if</span><span class="p">(</span><span class="n">ec</span><span class="p">)</span>
+      <span class="p">{</span>
+        <span class="c1">// Complete with a failed result
+</span><span class="c1"></span>        <span class="n">_handler</span><span class="p">(</span><span class="n">result_type</span><span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">failure</span><span class="p">(</span><span class="n">ec</span><span class="p">)));</span>
+        <span class="k">return</span><span class="p">;</span>
+      <span class="p">}</span>
+      <span class="c1">// Complete with a successful result
+</span><span class="c1"></span>      <span class="n">_handler</span><span class="p">(</span><span class="n">result_type</span><span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">success</span><span class="p">(</span><span class="n">v</span><span class="p">)));</span>
+    <span class="p">}</span>
+
+    <span class="n">Handler</span> <span class="n">_handler</span><span class="p">;</span>
+  <span class="p">};</span>
+
+  <span class="c1">// NOTE the initiate member function initiates the async operation,
+</span><span class="c1"></span>  <span class="c1">// and we want to defer to what would be the initiation of the
+</span><span class="c1"></span>  <span class="c1">// async_result whose handler signature is void(result_type).
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">Initiation</span><span class="p">,</span> <span class="k">class</span><span class="err">... </span><span class="nc">Args</span><span class="o">&gt;</span>
+  <span class="k">static</span> <span class="n">return_type</span>
+  <span class="n">initiate</span><span class="p">(</span>
+    <span class="n">Initiation</span><span class="o">&amp;&amp;</span> <span class="n">init</span><span class="p">,</span>
+    <span class="n">detail</span><span class="o">::</span><span class="n">as_result_t</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="o">&gt;&amp;&amp;</span> <span class="n">token</span><span class="p">,</span>
+    <span class="n">Args</span><span class="o">&amp;&amp;</span><span class="p">...</span> <span class="n">args</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="c1">// The async_initiate&lt;CompletionToken, void(result_type)&gt; helper
+</span><span class="c1"></span>    <span class="c1">// function will invoke the async initiation method of the
+</span><span class="c1"></span>    <span class="c1">// async_result&lt;CompletionToken, void(result_type)&gt;, as desired.
+</span><span class="c1"></span>    <span class="c1">// Instead of CompletionToken and void(result_type)	we start with
+</span><span class="c1"></span>    <span class="c1">// detail::as_result_t&lt;CompletionToken&gt; and void(ec, T), so
+</span><span class="c1"></span>    <span class="c1">// the inputs need to be massaged then passed along.
+</span><span class="c1"></span>    <span class="k">return</span> <span class="n">asio</span><span class="o">::</span><span class="n">async_initiate</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="p">,</span> <span class="kt">void</span><span class="p">(</span><span class="n">result_type</span><span class="p">)</span><span class="o">&gt;</span><span class="p">(</span>
+      <span class="c1">// create a new initiation which wraps the provided init
+</span><span class="c1"></span>      <span class="p">[</span><span class="n">init</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">Initiation</span><span class="o">&gt;</span><span class="p">(</span><span class="n">init</span><span class="p">)](</span>
+        <span class="k">auto</span><span class="o">&amp;&amp;</span> <span class="n">handler</span><span class="p">,</span> <span class="k">auto</span><span class="o">&amp;&amp;</span><span class="p">...</span> <span class="n">initArgs</span><span class="p">)</span> <span class="k">mutable</span> <span class="p">{</span>
+        <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">init</span><span class="p">)(</span>
+          <span class="c1">// we wrap the handler in the converting completion_handler from
+</span><span class="c1"></span>          <span class="c1">// above, and pass along the args
+</span><span class="c1"></span>          <span class="n">completion_handler</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">decay_t</span><span class="o">&lt;</span><span class="k">decltype</span><span class="p">(</span><span class="n">handler</span><span class="p">)</span><span class="o">&gt;&gt;</span><span class="p">{</span>
+            <span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="k">decltype</span><span class="p">(</span><span class="n">handler</span><span class="p">)</span><span class="o">&gt;</span><span class="p">(</span><span class="n">handler</span><span class="p">)},</span>
+          <span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="k">decltype</span><span class="p">(</span><span class="n">initArgs</span><span class="p">)</span><span class="o">&gt;</span><span class="p">(</span><span class="n">initArgs</span><span class="p">)...);</span>
+      <span class="p">},</span>
+      <span class="c1">// the new initiation is called with the handler unwrapped from
+</span><span class="c1"></span>      <span class="c1">// the token, and the original initiation arguments.
+</span><span class="c1"></span>      <span class="n">token</span><span class="p">.</span><span class="n">token</span><span class="p">,</span>
+      <span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">Args</span><span class="o">&gt;</span><span class="p">(</span><span class="n">args</span><span class="p">)...);</span>
+  <span class="p">}</span>
+<span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration_1_70.cpp#L134" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>To use, simply wrap the third party completion token with <code>as_result</code> to cause
+ASIO to return from <code>co_await</code> a <code>result</code> instead of throwing exceptions on
+failure:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">char</span> <span class="n">buffer</span><span class="p">[</span><span class="mi">1024</span><span class="p">];</span>
+
+<span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">size_t</span><span class="p">,</span> <span class="n">error_code</span><span class="o">&gt;</span> <span class="n">bytesread</span> <span class="o">=</span>
+  <span class="n">co_await</span> <span class="n">skt</span><span class="p">.</span><span class="n">async_read_some</span><span class="p">(</span><span class="n">asio</span><span class="o">::</span><span class="n">buffer</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">as_result</span><span class="p">(</span><span class="n">asio</span><span class="o">::</span><span class="n">use_awaitable</span><span class="p">));</span>
+</code></pre></div>
+<p>The real world production-level implementation below is a lot more complex than the
+above which has been deliberately simplified to aid exposition. The above
+should help you get up and running with the below, eventually.</p>
+
+<p>One again I would like to remind you that Outcome is not the appropriate place
+to seek help with ASIO voodoo. Please ask on
+<a href="https://stackoverflow.com/questions/tagged/boost-asio">Stackoverflow #boost-asio</a>.</p>
+
+<hr />
+
+<p>Here follows the real world, production-level adapation of Outcome into
+ASIO, written and maintained by <a href="https://github.com/cstratopoulos">Christos Stratopoulos</a>.
+If the following does not load due to Javascript being disabled, you can visit the gist at
+<a href="https://gist.github.com/cstratopoulos/901b5cdd41d07c6ce6d83798b09ecf9b/863c1dbf3b063a5ff9ff2bdd834242ead556e74e">https://gist.github.com/cstratopoulos/901b5cdd41d07c6ce6d83798b09ecf9b/863c1dbf3b063a5ff9ff2bdd834242ead556e74e</a>.</p>
+
+<script type="application/javascript" src="//gist.github.com/cstratopoulos/901b5cdd41d07c6ce6d83798b09ecf9b/863c1dbf3b063a5ff9ff2bdd834242ead556e74e.js"></script>
+
+
+        </div><p><small>Last revised: August 06, 2019 at 10:42:06 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../recipes/asio-integration.html"><img src="../images/prev.png" alt="Prev"></a>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>ASIO/Networking TS : Boost &lt; 1.70 - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+<a accesskey="p" href="../recipes.html"><img src="../images/prev.png" alt="Prev"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">ASIO/Networking TS : Boost &lt; 1.70</h1></div></div></div>
+  <div class="toc"><dl class="toc">
+<dt>
+<dd><dl>
+<dt>
+<dd><dl>
+<dt><a href="#compatibility-note">Compatibility note</a></dt>
+<dt><a href="#use-case">Use case</a></dt>
+<dt><a href="#implementation">Implementation</a></dt>
+</dl></dd></dt>
+</dl></dd></dt>
+</dl>
+  </div>
+  
+
+<p><em>Thanks to <a href="https://github.com/cstratopoulos">Christos Stratopoulos</a> for this Outcome recipe.</em></p>
+
+<hr />
+
+<h3 id="compatibility-note">Compatibility note</h3>
+
+<p>This recipe targets Boost versions before 1.70, where coroutine support is based around
+the <code>asio::experimental::this_coro::token</code> completion token. For integration with Boost
+versions 1.70 and onward, see <a href="asio-integration-1-70">this recipe</a>.</p>
+
+<hr />
+
+<h3 id="use-case">Use case</h3>
+
+<p><a href="https://www.boost.org/doc/libs/develop/doc/html/boost_asio.html">Boost.ASIO</a>
+and <a href="https://think-async.com/Asio/">standalone ASIO</a> provide the
+<a href="https://www.boost.org/doc/libs/develop/doc/html/boost_asio/reference/async_result.html"><code>async_result</code></a>
+customisation point for adapting arbitrary third party libraries, such as Outcome, into ASIO.</p>
+
+<p>Historically in ASIO you need to pass completion handler instances
+to the ASIO asynchronous i/o initiation functions. These get executed when the i/o
+completes.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// Dynamically allocate a buffer to read into. This must be move-only
+</span><span class="c1"></span>  <span class="c1">// so it can be attached to the completion handler, hence the unique_ptr.
+</span><span class="c1"></span>  <span class="k">auto</span> <span class="n">buffer</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">make_unique</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o">&lt;</span><span class="n">byte</span><span class="o">&gt;&gt;</span><span class="p">(</span><span class="mi">1024</span><span class="p">);</span>
+
+  <span class="c1">// Begin an asynchronous socket read, upon completion invoke
+</span><span class="c1"></span>  <span class="c1">// the lambda function specified
+</span><span class="c1"></span>  <span class="n">skt</span><span class="p">.</span><span class="n">async_read_some</span><span class="p">(</span><span class="n">asio</span><span class="o">::</span><span class="n">buffer</span><span class="p">(</span><span class="n">buffer</span><span class="o">-&gt;</span><span class="n">data</span><span class="p">(),</span> <span class="n">buffer</span><span class="o">-&gt;</span><span class="n">size</span><span class="p">()),</span>
+
+                      <span class="c1">// Retain lifetime of the i/o buffer until completion
+</span><span class="c1"></span>                      <span class="p">[</span><span class="n">buffer</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">buffer</span><span class="p">)](</span><span class="k">const</span> <span class="n">error_code</span> <span class="o">&amp;</span><span class="n">ec</span><span class="p">,</span> <span class="n">size_t</span> <span class="n">bytes</span><span class="p">)</span> <span class="p">{</span>
+                        <span class="c1">// Handle the buffer read
+</span><span class="c1"></span>                        <span class="k">if</span><span class="p">(</span><span class="n">ec</span><span class="p">)</span>
+                        <span class="p">{</span>
+                          <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Buffer read failed with &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">ec</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+                          <span class="k">return</span><span class="p">;</span>
+                        <span class="p">}</span>
+                        <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Read &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">bytes</span> <span class="o">&lt;&lt;</span> <span class="s">&#34; bytes into buffer&#34;</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+
+                        <span class="c1">// buffer will be dynamically freed now
+</span><span class="c1"></span>                      <span class="p">});</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration.cpp#L47" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>One of the big value adds of the Coroutines TS is the ability to not have to write
+so much boilerplate if you have a Coroutines supporting compiler:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// As coroutines suspend the calling thread whilst an asynchronous
+</span><span class="c1"></span>  <span class="c1">// operation executes, we can use stack allocation instead of dynamic
+</span><span class="c1"></span>  <span class="c1">// allocation
+</span><span class="c1"></span>  <span class="kt">char</span> <span class="n">buffer</span><span class="p">[</span><span class="mi">1024</span><span class="p">];</span>
+
+  <span class="c1">// Get an ASIO completion token for the current coroutine (requires
+</span><span class="c1"></span>  <span class="c1">// Coroutines TS)
+</span><span class="c1"></span>  <span class="n">asio</span><span class="o">::</span><span class="n">experimental</span><span class="o">::</span><span class="n">await_token</span> <span class="n">token</span> <span class="o">=</span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="n">co_await</span> <span class="n">asio</span><span class="o">::</span><span class="n">experimental</span><span class="o">::</span><span class="n">this_coro</span><span class="o">::</span><span class="n">token</span><span class="p">();</span>
+
+  <span class="c1">// Asynchronously read data, suspending this coroutine until completion,
+</span><span class="c1"></span>  <span class="c1">// returning the bytes of the data read into the result.
+</span><span class="c1"></span>  <span class="k">try</span>
+  <span class="p">{</span>
+    <span class="n">size_t</span> <span class="n">bytesread</span> <span class="o">=</span>  <span class="c1">//
+</span><span class="c1"></span>    <span class="n">co_await</span> <span class="n">skt</span><span class="p">.</span><span class="n">async_read_some</span><span class="p">(</span><span class="n">asio</span><span class="o">::</span><span class="n">buffer</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">token</span><span class="p">);</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Read &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">bytesread</span> <span class="o">&lt;&lt;</span> <span class="s">&#34; bytes into buffer&#34;</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="k">catch</span><span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">system_error</span> <span class="o">&amp;</span><span class="n">e</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Buffer read failed with &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">e</span><span class="p">.</span><span class="n">what</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration.cpp#L73" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The default ASIO implementation always throws exceptions on failure through
+its coroutine token transformation. The <a href="https://www.boost.org/doc/libs/develop/doc/html/boost_asio/reference/experimental__redirect_error.html"><code>redirect_error</code></a>
+token transformation recovers the option to use the <code>error_code</code> interface,
+but it suffers from the <a href="../motivation/error_codes.html">same drawbacks</a>
+that make pure error codes unappealing in the synchronous case.</p>
+
+<p>This recipe fixes that by making it possible for coroutinised
+i/o in ASIO to return a <code>result&lt;T&gt;</code>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// Asynchronously read data, suspending this coroutine until completion,
+</span><span class="c1"></span>  <span class="c1">// returning the bytes of the data read into the result, or any failure.
+</span><span class="c1"></span>  <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">size_t</span><span class="p">,</span> <span class="n">error_code</span><span class="o">&gt;</span> <span class="n">bytesread</span> <span class="o">=</span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="n">co_await</span> <span class="n">skt</span><span class="p">.</span><span class="n">async_read_some</span><span class="p">(</span><span class="n">asio</span><span class="o">::</span><span class="n">buffer</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">as_result</span><span class="p">(</span><span class="n">token</span><span class="p">));</span>
+
+  <span class="c1">// Usage is exactly like ordinary Outcome. Note the lack of exception throw!
+</span><span class="c1"></span>  <span class="k">if</span><span class="p">(</span><span class="n">bytesread</span><span class="p">.</span><span class="n">has_error</span><span class="p">())</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Buffer read failed with &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">bytesread</span><span class="p">.</span><span class="n">error</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+    <span class="k">return</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Read &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">bytesread</span><span class="p">.</span><span class="n">value</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="s">&#34; bytes into buffer&#34;</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration.cpp#L200" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<hr />
+
+<h3 id="implementation">Implementation</h3>
+
+<div class="notices warning" style="background: url('../images/warning.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">warning</div>
+<div class="notices message"><p>The below involves a lot of ASIO voodoo. <strong>NO SUPPORT WILL BE GIVEN HERE FOR THE ASIO
+CODE BELOW</strong>. Please raise any questions or problems that you have with how to implement
+this sort of stuff in ASIO
+on <a href="https://stackoverflow.com/questions/tagged/boost-asio">Stackoverflow #boost-asio</a>.</p>
+</div>
+</div>
+
+
+<p>The real world, production-level recipe can be found at the bottom of this page.
+You ought to use that in any real world use case.</p>
+
+<p>It is however worth providing a walkthrough of a simplified edition of the real world
+recipe, as a lot of barely documented ASIO voodoo is involved. You should not
+use the code presented next in your own code, it is too simplified. But it should
+help you understand how the real implementation works.</p>
+
+<p>Firstly we need to define some helper type sugar and a factory function for wrapping
+any arbitrary third party completion token with that type sugar:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">detail</span>
+<span class="p">{</span>
+  <span class="c1">// Type sugar for wrapping an external completion token
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">CompletionToken</span><span class="o">&gt;</span> <span class="k">struct</span> <span class="n">as_result_t</span>
+  <span class="p">{</span>
+    <span class="n">CompletionToken</span> <span class="n">token</span><span class="p">;</span>
+  <span class="p">};</span>
+<span class="p">}</span>  <span class="c1">// namespace detail
+</span><span class="c1"></span>
+<span class="c1">// Factory function for wrapping a third party completion token with
+</span><span class="c1">// our type sugar
+</span><span class="c1"></span><span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">CompletionToken</span><span class="o">&gt;</span>  <span class="c1">//
+</span><span class="c1"></span><span class="kr">inline</span> <span class="k">auto</span> <span class="n">as_result</span><span class="p">(</span><span class="n">CompletionToken</span> <span class="o">&amp;&amp;</span><span class="n">token</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">return</span> <span class="n">detail</span><span class="o">::</span><span class="n">as_result_t</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">decay_t</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="o">&gt;&gt;</span><span class="p">{</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="o">&gt;</span><span class="p">(</span><span class="n">token</span><span class="p">)};</span>
+<span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration.cpp#L99" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Next we tell ASIO about a new completion token it ought to recognise by specialising
+<a href="https://www.boost.org/doc/libs/develop/doc/html/boost_asio/reference/async_result.html"><code>async_result</code></a>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// Tell ASIO about a new kind of completion token, the kind returned
+</span><span class="c1">// from our as_result() factory function. This implementation is
+</span><span class="c1">// for functions with handlers void(error_code, T) only.
+</span><span class="c1"></span><span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">CompletionToken</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span>                        <span class="c1">//
+</span><span class="c1"></span><span class="k">struct</span> <span class="n">asio</span><span class="o">::</span><span class="n">async_result</span><span class="o">&lt;</span><span class="n">detail</span><span class="o">::</span><span class="n">as_result_t</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="o">&gt;</span><span class="p">,</span>  <span class="c1">//
+</span><span class="c1"></span>                          <span class="kt">void</span><span class="p">(</span><span class="n">error_code</span><span class="p">,</span> <span class="n">T</span><span class="p">)</span><span class="o">&gt;</span>                   <span class="c1">//
+</span><span class="c1"></span>
+    <span class="c1">// NOTE we subclass for an async result taking an outcome::result
+</span><span class="c1"></span>    <span class="c1">// as its completion handler. We will mangle the void(error_code, T)
+</span><span class="c1"></span>    <span class="c1">// completion handler into this completion handler below.
+</span><span class="c1"></span>    <span class="o">:</span> <span class="k">public</span> <span class="n">asio</span><span class="o">::</span><span class="n">async_result</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="p">,</span> <span class="kt">void</span><span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">error_code</span><span class="o">&gt;</span><span class="p">)</span><span class="o">&gt;</span>
+<span class="p">{</span>
+  <span class="c1">// The result type we shall return
+</span><span class="c1"></span>  <span class="k">using</span> <span class="n">result_type</span> <span class="o">=</span> <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">error_code</span><span class="o">&gt;</span><span class="p">;</span>
+  <span class="k">using</span> <span class="n">_base</span> <span class="o">=</span> <span class="n">asio</span><span class="o">::</span><span class="n">async_result</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="p">,</span> <span class="kt">void</span><span class="p">(</span><span class="n">result_type</span><span class="p">)</span><span class="o">&gt;</span><span class="p">;</span>
+  <span class="c1">// The awaitable type to be returned by the initiating function,
+</span><span class="c1"></span>  <span class="c1">// the co_await of which will yield a result_type
+</span><span class="c1"></span>  <span class="k">using</span> <span class="n">return_type</span> <span class="o">=</span> <span class="k">typename</span> <span class="n">_base</span><span class="o">::</span><span class="n">return_type</span><span class="p">;</span>
+
+  <span class="c1">// Get what would be the completion handler for the async_result
+</span><span class="c1"></span>  <span class="c1">// whose completion handler is void(result_type)
+</span><span class="c1"></span>  <span class="k">using</span> <span class="n">result_type_completion_handler_type</span> <span class="o">=</span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="k">typename</span> <span class="n">_base</span><span class="o">::</span><span class="n">completion_handler_type</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration.cpp#L118" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The tricky part to understand is that our <code>async_result</code> specialisation inherits
+from an <code>async_result</code> for the supplied completion token type with a completion
+handler which consumes a <code>result&lt;T&gt;</code>. Our <code>async_result</code> is actually therefore
+the base <code>async_result</code>, but we layer on top a <code>completion_handler_type</code> with
+the <code>void(error_code, size_t)</code> signature which constructs from that a <code>result</code>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// Wrap that completion handler with void(error_code, T) converting
+</span><span class="c1"></span>  <span class="c1">// handler
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="n">completion_handler_type</span>
+  <span class="p">{</span>
+    <span class="c1">// Pass through unwrapped completion token
+</span><span class="c1"></span>    <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">U</span><span class="o">&gt;</span>
+    <span class="n">completion_handler_type</span><span class="p">(</span><span class="o">::</span><span class="n">detail</span><span class="o">::</span><span class="n">as_result_t</span><span class="o">&lt;</span><span class="n">U</span><span class="o">&gt;</span> <span class="o">&amp;&amp;</span><span class="n">ch</span><span class="p">)</span>
+        <span class="o">:</span> <span class="n">_handler</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">U</span><span class="o">&gt;</span><span class="p">(</span><span class="n">ch</span><span class="p">.</span><span class="n">token</span><span class="p">))</span>
+    <span class="p">{</span>
+    <span class="p">}</span>
+
+    <span class="c1">// Our completion handler spec
+</span><span class="c1"></span>    <span class="kt">void</span> <span class="k">operator</span><span class="p">()(</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">,</span> <span class="n">T</span> <span class="n">v</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="c1">// Call the underlying completion handler, whose
+</span><span class="c1"></span>      <span class="c1">// completion function is void(result_type)
+</span><span class="c1"></span>      <span class="k">if</span><span class="p">(</span><span class="n">ec</span><span class="p">)</span>
+      <span class="p">{</span>
+        <span class="c1">// Complete with a failed result
+</span><span class="c1"></span>        <span class="n">_handler</span><span class="p">(</span><span class="n">result_type</span><span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">failure</span><span class="p">(</span><span class="n">ec</span><span class="p">)));</span>
+        <span class="k">return</span><span class="p">;</span>
+      <span class="p">}</span>
+      <span class="c1">// Complete with a successful result
+</span><span class="c1"></span>      <span class="n">_handler</span><span class="p">(</span><span class="n">result_type</span><span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">success</span><span class="p">(</span><span class="n">v</span><span class="p">)));</span>
+    <span class="p">}</span>
+
+    <span class="n">result_type_completion_handler_type</span> <span class="n">_handler</span><span class="p">;</span>
+  <span class="p">};</span>
+
+  <span class="c1">// Initialise base with the underlying completion handler
+</span><span class="c1"></span>  <span class="n">async_result</span><span class="p">(</span><span class="n">completion_handler_type</span> <span class="o">&amp;</span><span class="n">h</span><span class="p">)</span>
+      <span class="o">:</span> <span class="n">_base</span><span class="p">(</span><span class="n">h</span><span class="p">.</span><span class="n">_handler</span><span class="p">)</span>
+  <span class="p">{</span>
+  <span class="p">}</span>
+
+  <span class="k">using</span> <span class="n">_base</span><span class="o">::</span><span class="n">get</span><span class="p">;</span>
+<span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/boost-only/asio_integration.cpp#L143" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>To use, simply wrap the third party completion token with <code>as_result</code> to cause
+ASIO to return from <code>co_await</code> a <code>result</code> instead of throwing exceptions on
+failure:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">char</span> <span class="n">buffer</span><span class="p">[</span><span class="mi">1024</span><span class="p">];</span>
+<span class="n">asio</span><span class="o">::</span><span class="n">experimental</span><span class="o">::</span><span class="n">await_token</span> <span class="n">token</span> <span class="o">=</span>
+  <span class="n">co_await</span> <span class="n">asio</span><span class="o">::</span><span class="n">experimental</span><span class="o">::</span><span class="n">this_coro</span><span class="o">::</span><span class="n">token</span><span class="p">();</span>
+
+<span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">size_t</span><span class="p">,</span> <span class="n">error_code</span><span class="o">&gt;</span> <span class="n">bytesread</span> <span class="o">=</span>
+  <span class="n">co_await</span> <span class="n">skt</span><span class="p">.</span><span class="n">async_read_some</span><span class="p">(</span><span class="n">asio</span><span class="o">::</span><span class="n">buffer</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">as_result</span><span class="p">(</span><span class="n">token</span><span class="p">));</span>
+</code></pre></div>
+<p>The real world production-level implementation below is a lot more complex than the
+above which has been deliberately simplified to aid exposition. The above
+should help you get up and running with the below, eventually.</p>
+
+<p>One again I would like to remind you that Outcome is not the appropriate place
+to seek help with ASIO voodoo. Please ask on
+<a href="https://stackoverflow.com/questions/tagged/boost-asio">Stackoverflow #boost-asio</a>.</p>
+
+<hr />
+
+<p>Here follows the real world, production-level adapation of Outcome into
+ASIO, written and maintained by <a href="https://github.com/cstratopoulos">Christos Stratopoulos</a>.
+If the following does not load due to Javascript being disabled, you can visit the gist at
+<a href="https://gist.github.com/cstratopoulos/901b5cdd41d07c6ce6d83798b09ecf9b/da584844f58353915dc2600fba959813f793b456">https://gist.github.com/cstratopoulos/901b5cdd41d07c6ce6d83798b09ecf9b/da584844f58353915dc2600fba959813f793b456</a>.</p>
+
+<script type="application/javascript" src="//gist.github.com/cstratopoulos/901b5cdd41d07c6ce6d83798b09ecf9b/da584844f58353915dc2600fba959813f793b456.js"></script>
+
+
+        </div><p><small>Last revised: August 06, 2019 at 10:42:06 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../recipes.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../recipes.html"><img src="../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/recipes/foreign-try.html b/doc/html/recipes/foreign-try.html
new file mode 100644
index 000000000..a3fd99a97
--- /dev/null
+++ b/doc/html/recipes/foreign-try.html
@@ -0,0 +1,178 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Extending BOOST_OUTCOME_TRY - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../recipes/asio-integration-1-70.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../recipes.html"><img src="../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">Extending <code>BOOST_OUTCOME_TRY</code></h1></div></div></div>
+  
+
+<p>Outcome&rsquo;s <a href="../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+ operation is fully extensible
+to accept as input any foreign types.
+It already recognises types matching the
+<a href="../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" class="api-reference"><code>concepts::value_or_error&lt;T, E&gt;</code></a>
+ concept, which is to say all types which have:</p>
+
+<ul>
+<li>A public <code>.has_value()</code> member function which returns a <code>bool</code>.</li>
+<li>In order of preference, a public <code>.assume_value()</code>/<code>.value()</code> member
+function.</li>
+<li>In order of preference, a public <code>.as_failure()</code>/<code>.assume_error()</code>/<code>.error()</code>
+member function.</li>
+</ul>
+
+<p>This should automatically handle inputs of <code>std::expected&lt;T, E&gt;</code>, and many others,
+including intermixing Boost.Outcome and standalone Outcome within the same
+translation unit.</p>
+
+<p><code>BOOST_OUTCOME_TRY</code> has the following free function customisation points:</p>
+
+<dl>
+<dt><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+
+<dd>Returns a `bool` which is true if the input to TRY has a value.
+<dt><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+
+<dd>Returns a suitable <a href="../reference/types/failure_type.html" class="api-reference"><code>failure_type&lt;EC, EP = void&gt;</code></a>
+ which
+is returned immediately to cause stack unwind. Ought to preserve rvalue
+semantics (i.e. if passed an rvalue, move the error state into the failure
+type).
+<dt><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+
+<dd>Extracts a value type from the input for the `TRY` to set its variable.
+Ought to preserve rvalue semantics (i.e. if passed an rvalue, move the value).
+</dl>
+
+<p>New overloads of these to support additional input types must be injected into
+the <code>BOOST_OUTCOME_V2_NAMESPACE</code> namespace before the compiler parses the relevant
+<code>BOOST_OUTCOME_TRY</code> in order to be found. This is called &lsquo;early binding&rsquo; in the two
+phase name lookup model in C++. This was chosen over &lsquo;late binding&rsquo;, where an
+<code>BOOST_OUTCOME_TRY</code> in a templated piece of code could look up overloads introduced after
+parsing the template containing the <code>BOOST_OUTCOME_TRY</code>, because it has much lower
+impact on build times, as binding is done once at the point of parse, instead
+of on every occasion at the point of instantiation. If you are careful to ensure
+that you inject the overloads which you need early in the parse of the
+translation unit, all will be well.</p>
+
+<p>Let us work through an applied example.</p>
+
+<hr />
+
+<h2 id="a-very-foreign-pseudo-expected-type">A very foreign pseudo-Expected type</h2>
+
+<p>This is a paraphrase of a poorly written pseudo-Expected type which I once
+encountered in the production codebase of a large multinational. Lots
+of the code was already using it, and it was weird enough that it couldn&rsquo;t
+be swapped out for something better easily.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">enum</span> <span class="n">Errc</span>
+<span class="p">{</span>
+  <span class="n">kBadValue</span>
+<span class="p">};</span>
+<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">E</span> <span class="o">=</span> <span class="n">Errc</span><span class="o">&gt;</span> <span class="k">struct</span> <span class="n">ForeignExpected</span>
+<span class="p">{</span>
+  <span class="n">T</span> <span class="n">Value</span><span class="p">;</span>
+  <span class="n">E</span> <span class="n">Error</span><span class="p">;</span>
+  <span class="kt">int</span> <span class="n">IsErrored</span><span class="p">;</span>
+
+  <span class="n">ForeignExpected</span><span class="p">(</span><span class="n">T</span> <span class="n">v</span><span class="p">)</span>
+      <span class="o">:</span> <span class="n">Value</span><span class="p">(</span><span class="n">v</span><span class="p">)</span>
+      <span class="p">,</span> <span class="n">Error</span><span class="p">()</span>
+      <span class="p">,</span> <span class="n">IsErrored</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
+  <span class="p">{</span>
+  <span class="p">}</span>
+  <span class="n">ForeignExpected</span><span class="p">(</span><span class="n">E</span> <span class="n">e</span><span class="p">)</span>
+      <span class="o">:</span> <span class="n">Value</span><span class="p">()</span>
+      <span class="p">,</span> <span class="n">Error</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
+      <span class="p">,</span> <span class="n">IsErrored</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
+  <span class="p">{</span>
+  <span class="p">}</span>
+<span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/foreign_try.cpp#L37" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>What we would like is for new code to be written using Outcome, but be able
+to transparently call old code, like this:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">ForeignExpected</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">old_code</span><span class="p">(</span><span class="kt">int</span> <span class="n">a</span><span class="p">)</span>  <span class="c1">// old code
+</span><span class="c1"></span><span class="p">{</span>
+  <span class="k">if</span><span class="p">(</span><span class="mi">0</span> <span class="o">==</span> <span class="n">a</span><span class="p">)</span>
+    <span class="k">return</span> <span class="n">kBadValue</span><span class="p">;</span>
+  <span class="k">return</span> <span class="n">a</span><span class="p">;</span>
+<span class="p">}</span>
+
+<span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">new_code</span><span class="p">(</span><span class="kt">int</span> <span class="n">a</span><span class="p">)</span>  <span class="c1">// new code
+</span><span class="c1"></span><span class="p">{</span>
+  <span class="n">BOOST_OUTCOME_TRY</span><span class="p">(</span><span class="k">auto</span> <span class="n">x</span><span class="p">,</span> <span class="n">old_code</span><span class="p">(</span><span class="n">a</span><span class="p">));</span>
+  <span class="k">return</span> <span class="n">x</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/foreign_try.cpp#L88" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Telling Outcome about this weird foreign Expected is straightforward:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_V2_NAMESPACE_BEGIN</span>
+<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span>  <span class="c1">//
+</span><span class="c1"></span><span class="kr">inline</span> <span class="kt">bool</span> <span class="n">try_operation_has_value</span><span class="p">(</span><span class="k">const</span> <span class="n">ForeignExpected</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;</span> <span class="o">&amp;</span><span class="n">v</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">return</span> <span class="mi">0</span> <span class="o">==</span> <span class="n">v</span><span class="p">.</span><span class="n">IsErrored</span><span class="p">;</span>
+<span class="p">}</span>
+<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span>  <span class="c1">//
+</span><span class="c1"></span><span class="kr">inline</span> <span class="k">auto</span> <span class="n">try_operation_return_as</span><span class="p">(</span><span class="k">const</span> <span class="n">ForeignExpected</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;</span> <span class="o">&amp;</span><span class="n">v</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">switch</span><span class="p">(</span><span class="n">v</span><span class="p">.</span><span class="n">Error</span><span class="p">)</span>
+  <span class="p">{</span>
+  <span class="k">case</span> <span class="nl">kBadValue</span><span class="p">:</span>
+    <span class="k">return</span> <span class="n">failure</span><span class="p">(</span><span class="n">make_error_code</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">argument_out_of_domain</span><span class="p">));</span>
+  <span class="p">}</span>
+  <span class="n">abort</span><span class="p">();</span>
+<span class="p">}</span>
+<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">E</span><span class="o">&gt;</span>  <span class="c1">//
+</span><span class="c1"></span><span class="kr">inline</span> <span class="k">auto</span> <span class="n">try_operation_extract_value</span><span class="p">(</span><span class="k">const</span> <span class="n">ForeignExpected</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">E</span><span class="o">&gt;</span> <span class="o">&amp;</span><span class="n">v</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">return</span> <span class="n">v</span><span class="p">.</span><span class="n">Value</span><span class="p">;</span>
+<span class="p">}</span>
+<span class="n">BOOST_OUTCOME_V2_NAMESPACE_END</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/foreign_try.cpp#L63" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>And now <code>BOOST_OUTCOME_TRY</code> works exactly as expected:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="k">auto</span> <span class="n">printresult</span> <span class="o">=</span> <span class="p">[](</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">desc</span><span class="p">,</span> <span class="k">auto</span> <span class="n">x</span><span class="p">)</span> <span class="p">{</span>
+    <span class="k">if</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="n">desc</span> <span class="o">&lt;&lt;</span> <span class="s">&#34; returns successful &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">x</span><span class="p">.</span><span class="n">value</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+    <span class="p">}</span>
+    <span class="k">else</span>
+    <span class="p">{</span>
+      <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="n">desc</span> <span class="o">&lt;&lt;</span> <span class="s">&#34; returns failure &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">x</span><span class="p">.</span><span class="n">error</span><span class="p">().</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+    <span class="p">}</span>
+  <span class="p">};</span>
+  <span class="n">printresult</span><span class="p">(</span><span class="s">&#34;</span><span class="se">\n</span><span class="s">new_code(5)&#34;</span><span class="p">,</span> <span class="n">new_code</span><span class="p">(</span><span class="mi">5</span><span class="p">));</span>
+  <span class="n">printresult</span><span class="p">(</span><span class="s">&#34;</span><span class="se">\n</span><span class="s">new_code(0)&#34;</span><span class="p">,</span> <span class="n">new_code</span><span class="p">(</span><span class="mi">0</span><span class="p">));</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/foreign_try.cpp#L105" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>&hellip; which outputs:</p>
+
+<pre><code>new_code(5) returns successful 5
+
+new_code(0) returns failure argument out of domain
+</code></pre>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">API reference</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="./reference/macros.html" >Macros</a><ol><li>
+	<a href="./reference/macros/template.html" >Constrained template macros</a><li>
+	<a href="./reference/macros/version.html" >Version macros</a><li>
+	<a href="./reference/macros/co_try.html" ><code>BOOST_OUTCOME_CO_TRY(var, expr)</code></a>
+<p>Evaluate within a coroutine an expression which results in an understood type, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/co_tryv.html" ><code>BOOST_OUTCOME_CO_TRYV(expr)/BOOST_OUTCOME_CO_TRY(expr)</code></a>
+<p>Evaluate from within a coroutine an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/co_tryv2.html" ><code>BOOST_OUTCOME_CO_TRYV2(spec, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/co_tryv2_failure_likely.html" ><code>BOOST_OUTCOME_CO_TRYV2_FAILURE_LIKELY(spec, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/co_tryv_failure_likely.html" ><code>BOOST_OUTCOME_CO_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(expr)</code></a>
+<p>Evaluate from within a coroutine an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/co_tryx.html" ><code>BOOST_OUTCOME_CO_TRYX(expr)</code></a>
+<p>Evaluate from within a coroutine an expression which results in an understood type, emitting the <code>T</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/co_tryx_failure_likely.html" ><code>BOOST_OUTCOME_CO_TRYX_FAILURE_LIKELY(expr)</code></a>
+<p>Evaluate from within a coroutine an expression which results in an understood type, emitting the <code>T</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/co_try_failure_likely.html" ><code>BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(var, expr)</code></a>
+<p>Evaluate within a coroutine an expression which results in an understood type, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/disable_execinfo.html" ><code>BOOST_OUTCOME_DISABLE_EXECINFO</code></a>
+<p>If defined, disables the use of the <code>&lt;execinfo.h&gt;</code> header (or the win32 emulation).</p><li>
+	<a href="./reference/macros/enable_legacy_support_for.html" ><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+<p>Enables backwards features and naming compatibility for earlier versions of Outcome.</p><li>
+	<a href="./reference/macros/nodiscard.html" ><code>BOOST_OUTCOME_NODISCARD</code></a>
+<p>How to tell the compiler than the return value of a function should not be discarded without examining it.</p><li>
+	<a href="./reference/macros/requires.html" ><code>BOOST_OUTCOME_REQUIRES(...)</code></a>
+<p>A C++ 20 <code>requires(...)</code>, if available.</p><li>
+	<a href="./reference/macros/symbol_visible.html" ><code>BOOST_OUTCOME_SYMBOL_VISIBLE</code></a>
+<p>How to mark throwable types as always having default ELF symbol visibility.</p><li>
+	<a href="./reference/macros/thread_local.html" ><code>BOOST_OUTCOME_THREAD_LOCAL</code></a>
+<p>How to mark variables as having thread local storage duration.</p><li>
+	<a href="./reference/macros/throw_exception.html" ><code>BOOST_OUTCOME_THROW_EXCEPTION(expr)</code></a>
+<p>How to throw a C++ exception, or equivalent thereof.</p><li>
+	<a href="./reference/macros/try.html" ><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/tryv.html" ><code>BOOST_OUTCOME_TRYV(expr)/BOOST_OUTCOME_TRY(expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/tryv2.html" ><code>BOOST_OUTCOME_TRYV2(spec, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/tryv2_failure_likely.html" ><code>BOOST_OUTCOME_TRYV2_FAILURE_LIKELY(spec, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/tryv_failure_likely.html" ><code>BOOST_OUTCOME_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_TRY_FAILURE_LIKELY(expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/tryx.html" ><code>BOOST_OUTCOME_TRYX(expr)</code></a>
+<p>Evaluate an expression which results in an understood type, emitting the <code>T</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/tryx_failure_likely.html" ><code>BOOST_OUTCOME_TRYX_FAILURE_LIKELY(expr)</code></a>
+<p>Evaluate an expression which results in an understood type, emitting the <code>T</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/try_failure_likely.html" ><code>BOOST_OUTCOME_TRY_FAILURE_LIKELY(var, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="./reference/macros/in_place_type.html" ><code>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE</code></a>
+<p>How to implement <code>in_place_type_t&lt;T&gt;</code> and <code>in_place_type&lt;T&gt;</code>.</p><li>
+	<a href="./reference/macros/is_nothrow_swappable.html" ><code>BOOST_OUTCOME_USE_STD_IS_NOTHROW_SWAPPABLE</code></a>
+<p>How to implement <code>is_nothrow_swappable&lt;T&gt;</code>.</p></li></ol><li>
+	<a href="./reference/concepts.html" >Concepts</a><ol><li>
+	<a href="./reference/concepts/basic_outcome.html" ><code>basic_outcome&lt;T&gt;</code></a>
+<p>A boolean concept matching types which are convertible to a <code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code>.</p><li>
+	<a href="./reference/concepts/basic_result.html" ><code>basic_result&lt;T&gt;</code></a>
+<p>A boolean concept matching types which are convertible to a <code>basic_result&lt;T, E, NoValuePolicy&gt;</code>.</p><li>
+	<a href="./reference/concepts/value_or_error.html" ><code>value_or_error&lt;T&gt;</code></a>
+<p>A boolean concept matching types with either a value or an error.</p><li>
+	<a href="./reference/concepts/value_or_none.html" ><code>value_or_none&lt;T&gt;</code></a>
+<p>A boolean concept matching types with an optional value.</p></li></ol><li>
+	<a href="./reference/converters.html" >Converters</a><ol><li>
+	<a href="./reference/converters/value_or_error.html" ><code>value_or_error&lt;T, U&gt;</code></a>
+<p>A customisable converter of <code>value_or_error&lt;T, E&gt;</code> concept matching types.</p></li></ol><li>
+	<a href="./reference/traits.html" >Traits</a><ol><li>
+	<a href="./reference/traits/is_basic_outcome.html" ><code>is_basic_outcome&lt;T&gt;</code></a>
+<p>An integral constant type true for <code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code> types.</p><li>
+	<a href="./reference/traits/is_basic_result.html" ><code>is_basic_result&lt;T&gt;</code></a>
+<p>An integral constant type true for <code>basic_result&lt;T, E, NoValuePolicy&gt;</code> types.</p><li>
+	<a href="./reference/traits/is_error_code_available.html" ><code>is_error_code_available&lt;T&gt;</code></a>
+<p>True if an error code can be constructed from a <code>T</code>.</p><li>
+	<a href="./reference/traits/is_error_type.html" ><code>is_error_type&lt;E&gt;</code></a>
+<p>A customisable integral constant type true for <code>E</code> types which are to receive error throwing no-value policies.</p><li>
+	<a href="./reference/traits/is_error_type_enum.html" ><code>is_error_type_enum&lt;E, Enum&gt;</code></a>
+<p>A customisable integral constant type true for <code>E</code> types constructible from <code>Enum</code> types which are to receive error throwing no-value policies.</p><li>
+	<a href="./reference/traits/is_exception_ptr_available.html" ><code>is_exception_ptr_available&lt;T&gt;</code></a>
+<p>True if an exception ptr can be constructed from a <code>T</code>.</p><li>
+	<a href="./reference/traits/is_failure_type.html" ><code>is_failure_type&lt;T&gt;</code></a>
+<p>An integral constant boolean variable true for <code>failure_type&lt;EC, E = void&gt;</code> types.</p><li>
+	<a href="./reference/traits/is_move_bitcopying.html" ><code>is_move_bitcopying&lt;T&gt;</code></a>
+<p>(&gt;= Outcome v2.2.0) A customisable integral constant type true for <code>T</code> types which are move bitcopying safe.</p><li>
+	<a href="./reference/traits/is_success_type.html" ><code>is_success_type&lt;T&gt;</code></a>
+<p>An integral constant boolean variable true for <code>success_type&lt;T&gt;</code> types.</p><li>
+	<a href="./reference/traits/type_can_be_used_in_basic_result.html" ><code>type_can_be_used_in_basic_result&lt;R&gt;</code></a>
+<p>A constexpr boolean true for types permissible in <code>basic_result&lt;T, E, NoValuePolicy&gt;</code>.</p></li></ol><li>
+	<a href="./reference/policies.html" >Policies</a><ol><li>
+	<a href="./reference/policies/base.html" ><code>base</code></a>
+<p>Base class of most policy classes defining the narrow observer policies.</p><li>
+	<a href="./reference/policies/all_narrow.html" ><code>all_narrow</code></a>
+<p>Policy class defining that hard undefined behaviour should occur on incorrect narrow and wide value, error or exception observation. Inherits publicly from <code>base</code>.</p><li>
+	<a href="./reference/policies/error_code_throw_as_system_error_outcome.html" ><code>error_code_throw_as_system_error&lt;T, EC, EP&gt;</code></a>
+<p>Policy class defining that <code>EP</code> ought to be rethrown if possible, then the ADL discovered free function <code>outcome_throw_as_system_error_with_payload()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_outcome</code>.</p><li>
+	<a href="./reference/policies/error_code_throw_as_system_error_result.html" ><code>error_code_throw_as_system_error&lt;T, EC, void&gt;</code></a>
+<p>Policy class defining that the ADL discovered free function <code>outcome_throw_as_system_error_with_payload()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_result</code>.</p><li>
+	<a href="./reference/policies/exception_ptr_rethrow_outcome.html" ><code>exception_ptr_rethrow&lt;T, EC, EP&gt;</code></a>
+<p>Policy class defining that the ADL discovered free function <code>rethrow_exception()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_outcome</code>.</p><li>
+	<a href="./reference/policies/exception_ptr_rethrow_result.html" ><code>exception_ptr_rethrow&lt;T, EC, void&gt;</code></a>
+<p>Policy class defining that the ADL discovered free function <code>rethrow_exception()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_result</code>.</p><li>
+	<a href="./reference/policies/fail_to_compile_observers.html" ><code>fail_to_compile_observers</code></a>
+<p>Policy class defining that a static assertion should occur upon compilation of the wide value, error or exception observation. Inherits publicly from <code>base</code>.</p><li>
+	<a href="./reference/policies/terminate.html" ><code>terminate</code></a>
+<p>Policy class defining that <code>std::terminate()</code> should be called on incorrect wide value, error or exception observation. Inherits publicly from <code>base</code>.</p><li>
+	<a href="./reference/policies/throw_bad_result_access.html" ><code>throw_bad_result_access&lt;EC&gt;</code></a>
+<p>Policy class defining that <code>bad_result_access_with&lt;EC&gt;</code> should be thrown on incorrect wide value observation. Inherits publicly from <code>base</code>.</p></li></ol><li>
+	<a href="./reference/types.html" >Types</a><ol><li>
+	<a href="./reference/types/basic_outcome.html" ><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+<p>A type carrying one of (i) a successful <code>T</code> (ii) a disappointment <code>EC</code> (iii) a failure <code>EP</code> (iv) both a disappointment <code>EC</code> and a failure <code>EP</code>, with <code>NoValuePolicy</code> specifying what to do if one tries to read state which isn&rsquo;t there.</p><li>
+	<a href="./reference/types/basic_result.html" ><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+<p>A sum type carrying either a successful <code>T</code>, or a disappointment <code>E</code>, with <code>NoValuePolicy</code> specifying what to do if one tries to read state which isn&rsquo;t there.</p><li>
+	<a href="./reference/types/bad_outcome_access.html" ><code>bad_outcome_access</code></a>
+<p>Exception type publicly inheriting from <code>std::logic_error</code> indicating an incorrect observation of value or error or exception occurred.</p><li>
+	<a href="./reference/types/bad_result_access_with.html" ><code>bad_result_access_with&lt;EC&gt;</code></a>
+<p>Exception type publicly inheriting from <code>bad_result_access</code> indicating an incorrect observation of value occurred, supplying the error value.</p><li>
+	<a href="./reference/types/bad_result_access.html" ><code>bad_result_access</code></a>
+<p>Exception type publicly inheriting from <code>std::logic_error</code> indicating an incorrect observation of value or error occurred.</p><li>
+	<a href="./reference/types/awaitables/eager.html" ><code>eager&lt;T, Executor = void&gt;/atomic_eager&lt;T, Executor = void&gt;</code></a>
+<p>An eagerly evaluated coroutine awaitable with Outcome customisation.</p><li>
+	<a href="./reference/types/failure_type.html" ><code>failure_type&lt;EC, EP = void&gt;</code></a>
+<p>Type sugar for constructing an unsuccessful result or outcome.</p><li>
+	<a href="./reference/types/awaitables/generator.html" ><code>generator&lt;T, Executor = void&gt;</code></a>
+<p>A lazily evaluated coroutine generator with Outcome customisation.</p><li>
+	<a href="./reference/types/in_place_type_t.html" ><code>in_place_type_t&lt;T&gt;</code></a>
+<p>Either <code>std::in_place_type_t&lt;T&gt;</code> or a local emulation, depending on the <code>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE</code> macro.</p><li>
+	<a href="./reference/types/awaitables/lazy.html" ><code>lazy&lt;T, Executor = void&gt;/atomic_lazy&lt;T, Executor = void&gt;</code></a>
+<p>A lazily evaluated coroutine awaitable with Outcome customisation.</p><li>
+	<a href="./reference/types/success_type.html" ><code>success_type&lt;T&gt;</code></a>
+<p>Type sugar for constructing a successful result or outcome.</p></li></ol><li>
+	<a href="./reference/aliases.html" >Aliases</a><ol><li>
+	<a href="./reference/aliases/boost_checked.html" ><code>boost_checked&lt;T, E = boost::system::error_code&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>boost::system::error_code</code> and <code>policy::throw_bad_result_access&lt;EC&gt;</code>.</p><li>
+	<a href="./reference/aliases/boost_outcome.html" ><code>boost_outcome&lt;T, EC = boost::system::error_code, EP = boost::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+<p>A type alias to a <code>basic_outcome</code> configured with <code>boost::system::error_code</code>, <code>boost::exception_ptr</code> and <code>policy::default_policy</code>.</p><li>
+	<a href="./reference/aliases/boost_result.html" ><code>boost_result&lt;T, E = boost::system::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>boost::system::error_code</code> and <code>policy::default_policy</code>.</p><li>
+	<a href="./reference/aliases/boost_unchecked.html" ><code>boost_unchecked&lt;T, E = boost::system::error_code&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>boost::system::error_code</code> and <code>policy::all_narrow</code>.</p><li>
+	<a href="./reference/aliases/checked.html" ><code>checked&lt;T, E = varies&gt;</code></a>
+<p>A type alias to a <code>std_checked&lt;T, E&gt;</code> (standalone edition) or <code>boost_checked&lt;T, E&gt;</code> (Boost edition).</p><li>
+	<a href="./reference/aliases/default_policy.html" ><code>default_policy&lt;T, EC, EP&gt;</code></a>
+<p>A type alias to a no-value policy selected based on traits matching of <code>T</code>, <code>EC</code> and <code>EP</code>.</p><li>
+	<a href="./reference/aliases/outcome.html" ><code>outcome&lt;T, EC = varies, EP = varies, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+<p>A type alias to a <code>std_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code> (standalone edition) or <code>boost_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code> (Boost edition).</p><li>
+	<a href="./reference/aliases/result.html" ><code>result&lt;T, E = varies, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+<p>A type alias to a <code>std_result&lt;T, E, NoValuePolicy&gt;</code> (standalone edition) or <code>boost_result&lt;T, E, NoValuePolicy&gt;</code> (Boost edition).</p><li>
+	<a href="./reference/aliases/std_checked.html" ><code>std_checked&lt;T, E = std::error_code&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>std::error_code</code> and <code>policy::throw_bad_result_access&lt;EC&gt;</code>.</p><li>
+	<a href="./reference/aliases/std_outcome.html" ><code>std_outcome&lt;T, EC = std::error_code, EP = std::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+<p>A type alias to a <code>basic_outcome</code> configured with <code>std::error_code</code>, <code>std::exception_ptr</code> and <code>policy::default_policy</code>.</p><li>
+	<a href="./reference/aliases/std_result.html" ><code>std_result&lt;T, E = std::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>std::error_code</code> and <code>policy::default_policy</code>.</p><li>
+	<a href="./reference/aliases/std_unchecked.html" ><code>std_unchecked&lt;T, E = std::error_code&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>std::error_code</code> and <code>policy::all_narrow</code>.</p><li>
+	<a href="./reference/aliases/unchecked.html" ><code>unchecked&lt;T, E = varies&gt;</code></a>
+<p>A type alias to a <code>std_unchecked&lt;T, E&gt;</code> (standalone edition) or <code>boost_unchecked&lt;T, E&gt;</code> (Boost edition).</p></li></ol><li>
+	<a href="./reference/functions.html" >Functions</a><ol><li>
+	<a href="./reference/functions/hooks.html" >Hooks</a>
+<p>Functions used to hook into the functionality of <code>basic_result</code> and <code>basic_outcome</code>.</p><li>
+	<a href="./reference/functions/iostream.html" >Iostream</a>
+<p>Functions used to print, serialise and deserialise <code>basic_result</code> and <code>basic_outcome</code>.</p><li>
+	<a href="./reference/functions/policy.html" >Policy</a>
+<p>Functions used to customise how the policy classes operate.</p><li>
+	<a href="./reference/functions/failure.html" ><code>auto failure(T &amp;&amp;, ...)</code></a>
+<p>Returns appropriate type sugar for constructing an unsuccessful result or outcome.</p><li>
+	<a href="./reference/functions/success.html" ><code>auto success(T &amp;&amp;, ...)</code></a>
+<p>Returns appropriate type sugar for constructing a successful result or outcome.</p><li>
+	<a href="./reference/functions/try_operation_has_value.html" ><code>bool try_operation_has_value(X)</code></a>
+<p>Default implementation of <code>try_operation_has_value(X)</code> ADL customisation point for <code>BOOST_OUTCOME_TRY</code>.</p><li>
+	<a href="./reference/functions/try_operation_extract_value.html" ><code>decltype(auto) try_operation_extract_value(X)</code></a>
+<p>Default implementation of <code>try_operation_extract_value(X)</code> ADL customisation point for <code>BOOST_OUTCOME_TRY</code>.</p><li>
+	<a href="./reference/functions/try_operation_return_as.html" ><code>decltype(auto) try_operation_return_as(X)</code></a>
+<p>Default implementation of <code>try_operation_return_as(X)</code> ADL customisation point for <code>BOOST_OUTCOME_TRY</code>.</p><li>
+	<a href="./reference/functions/error_from_exception.html" ><code>std::error_code error_from_exception(std::exception_ptr &amp;&amp;ep = std::current_exception(), std::error_code not_matched = std::make_error_code(std::errc::resource_unavailable_try_again)) noexcept</code></a>
+<p>Returns an error code matching a thrown standard library exception.</p><li>
+	<a href="./reference/functions/strong_swap.html" ><code>void strong_swap(bool &amp;all_good, T &amp;a, T &amp;b)</code></a>
+<p>Tries to perform a strong guarantee swap.</p><li>
+	<a href="./reference/functions/try_throw_std_exception_from_error.html" ><code>void try_throw_std_exception_from_error(std::error_code ec, const std::string &amp;msg = std::string{})</code></a>
+<p>Try to throw a standard library exception type matching an error code.</p></li></ol></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 10, 2018 at 20:32:00 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./experimental/c-api/from-c/try.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/aliases.html b/doc/html/reference/aliases.html
new file mode 100644
index 000000000..b537d1253
--- /dev/null
+++ b/doc/html/reference/aliases.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Aliases - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../reference/types/success_type.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/aliases/boost_checked.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Aliases</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../reference/aliases/boost_checked.html" ><code>boost_checked&lt;T, E = boost::system::error_code&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>boost::system::error_code</code> and <code>policy::throw_bad_result_access&lt;EC&gt;</code>.</p><li>
+	<a href="../reference/aliases/boost_outcome.html" ><code>boost_outcome&lt;T, EC = boost::system::error_code, EP = boost::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+<p>A type alias to a <code>basic_outcome</code> configured with <code>boost::system::error_code</code>, <code>boost::exception_ptr</code> and <code>policy::default_policy</code>.</p><li>
+	<a href="../reference/aliases/boost_result.html" ><code>boost_result&lt;T, E = boost::system::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>boost::system::error_code</code> and <code>policy::default_policy</code>.</p><li>
+	<a href="../reference/aliases/boost_unchecked.html" ><code>boost_unchecked&lt;T, E = boost::system::error_code&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>boost::system::error_code</code> and <code>policy::all_narrow</code>.</p><li>
+	<a href="../reference/aliases/checked.html" ><code>checked&lt;T, E = varies&gt;</code></a>
+<p>A type alias to a <code>std_checked&lt;T, E&gt;</code> (standalone edition) or <code>boost_checked&lt;T, E&gt;</code> (Boost edition).</p><li>
+	<a href="../reference/aliases/default_policy.html" ><code>default_policy&lt;T, EC, EP&gt;</code></a>
+<p>A type alias to a no-value policy selected based on traits matching of <code>T</code>, <code>EC</code> and <code>EP</code>.</p><li>
+	<a href="../reference/aliases/outcome.html" ><code>outcome&lt;T, EC = varies, EP = varies, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+<p>A type alias to a <code>std_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code> (standalone edition) or <code>boost_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code> (Boost edition).</p><li>
+	<a href="../reference/aliases/result.html" ><code>result&lt;T, E = varies, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+<p>A type alias to a <code>std_result&lt;T, E, NoValuePolicy&gt;</code> (standalone edition) or <code>boost_result&lt;T, E, NoValuePolicy&gt;</code> (Boost edition).</p><li>
+	<a href="../reference/aliases/std_checked.html" ><code>std_checked&lt;T, E = std::error_code&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>std::error_code</code> and <code>policy::throw_bad_result_access&lt;EC&gt;</code>.</p><li>
+	<a href="../reference/aliases/std_outcome.html" ><code>std_outcome&lt;T, EC = std::error_code, EP = std::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+<p>A type alias to a <code>basic_outcome</code> configured with <code>std::error_code</code>, <code>std::exception_ptr</code> and <code>policy::default_policy</code>.</p><li>
+	<a href="../reference/aliases/std_result.html" ><code>std_result&lt;T, E = std::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>std::error_code</code> and <code>policy::default_policy</code>.</p><li>
+	<a href="../reference/aliases/std_unchecked.html" ><code>std_unchecked&lt;T, E = std::error_code&gt;</code></a>
+<p>A type alias to a <code>basic_result</code> configured with <code>std::error_code</code> and <code>policy::all_narrow</code>.</p><li>
+	<a href="../reference/aliases/unchecked.html" ><code>unchecked&lt;T, E = varies&gt;</code></a>
+<p>A type alias to a <code>std_unchecked&lt;T, E&gt;</code> (standalone edition) or <code>boost_unchecked&lt;T, E&gt;</code> (Boost edition).</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 13, 2018 at 21:10:19 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../reference/types/success_type.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/aliases/boost_checked.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/boost_checked.html b/doc/html/reference/aliases/boost_checked.html
new file mode 100644
index 000000000..939c92e30
--- /dev/null
+++ b/doc/html/reference/aliases/boost_checked.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>boost_checked&lt;T, E = boost::system::error_code&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/boost_outcome.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>boost_checked&lt;T, E = boost::system::error_code&gt;</code></h1></div></div></div>
+  <p>A type alias to a <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ configured with <code>boost::system::error_code</code> and <code>policy::</code><a href="../../reference/policies/throw_bad_result_access.html" class="api-reference"><code>throw_bad_result_access&lt;EC&gt;</code></a>
+.</p>
+
+<p>This type alias always references the <code>boost</code> edition of things, unlike <a href="../../reference/aliases/checked.html" class="api-reference"><code>checked&lt;T, E = varies&gt;</code></a>
+ which references either this alias or <a href="../../reference/aliases/std_checked.html" class="api-reference"><code>std_checked&lt;T, E = std::error_code&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/boost_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/boost_outcome.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/boost_outcome.html b/doc/html/reference/aliases/boost_outcome.html
new file mode 100644
index 000000000..8af624fb5
--- /dev/null
+++ b/doc/html/reference/aliases/boost_outcome.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>boost_outcome&lt;T, EC = boost::system::error_code, EP = boost::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/boost_checked.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/boost_result.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>boost_outcome&lt;T, EC = boost::system::error_code, EP = boost::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></h1></div></div></div>
+  <p>A type alias to a <a href="../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+ configured with <a href="../../reference/aliases/boost_checked.html" class="api-reference"><code>boost::system::error_code</code></a>
+, <a href="../../reference/aliases/boost_outcome.html" class="api-reference"><code>boost::exception_ptr</code></a>
+ and <code>policy::</code><a href="../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy</code></a>
+.</p>
+
+<p>This type alias always references the <code>std</code> edition of things, unlike <a href="../../reference/aliases/outcome.html" class="api-reference"><code>outcome&lt;T, EC = varies, EP = varies, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+ which references either this alias or <a href="../../reference/aliases/std_outcome.html" class="api-reference"><code>std_outcome&lt;T, EC = std::error_code, EP = std::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/boost_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 23:42:52 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/boost_checked.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/boost_result.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/boost_result.html b/doc/html/reference/aliases/boost_result.html
new file mode 100644
index 000000000..0de33cb25
--- /dev/null
+++ b/doc/html/reference/aliases/boost_result.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>boost_result&lt;T, E = boost::system::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/boost_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/boost_unchecked.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>boost_result&lt;T, E = boost::system::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></h1></div></div></div>
+  <p>A type alias to a <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ configured with <code>boost::system::error_code</code> and <code>policy::</code><a href="../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy</code></a>
+.</p>
+
+<p>This type alias always references the <code>boost</code> edition of things, unlike <a href="../../reference/aliases/result.html" class="api-reference"><code>result&lt;T, E = varies, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+ which references either this alias or <a href="../../reference/aliases/std_result.html" class="api-reference"><code>std_result&lt;T, E = std::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/boost_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/boost_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/boost_unchecked.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/boost_unchecked.html b/doc/html/reference/aliases/boost_unchecked.html
new file mode 100644
index 000000000..301bc3176
--- /dev/null
+++ b/doc/html/reference/aliases/boost_unchecked.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>boost_unchecked&lt;T, E = boost::system::error_code&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/boost_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/checked.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>boost_unchecked&lt;T, E = boost::system::error_code&gt;</code></h1></div></div></div>
+  <p>A type alias to a <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ configured with <code>boost::system::error_code</code> and <code>policy::</code><a href="../../reference/policies/all_narrow.html" class="api-reference"><code>all_narrow</code></a>
+.</p>
+
+<p>This type alias always references the <code>boost</code> edition of things, unlike <a href="../../reference/aliases/unchecked.html" class="api-reference"><code>unchecked&lt;T, E = varies&gt;</code></a>
+ which references either this alias or <a href="../../reference/aliases/std_unchecked.html" class="api-reference"><code>std_unchecked&lt;T, E = std::error_code&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/boost_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/boost_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/checked.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/checked.html b/doc/html/reference/aliases/checked.html
new file mode 100644
index 000000000..53e3d1c26
--- /dev/null
+++ b/doc/html/reference/aliases/checked.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>checked&lt;T, E = varies&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/boost_unchecked.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/default_policy.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>checked&lt;T, E = varies&gt;</code></h1></div></div></div>
+  <p>A type alias to either <a href="../../reference/aliases/std_checked.html" class="api-reference"><code>std_checked&lt;T, E = std::error_code&gt;</code></a>
+ (standalone edition) or <a href="../../reference/aliases/boost_checked.html" class="api-reference"><code>boost_checked&lt;T, E = boost::system::error_code&gt;</code></a>
+ (Boost edition). This means that <code>checked&lt;T&gt;</code> uses the appropriate default alias depending on which edition of Outcome is in use.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/boost_unchecked.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/default_policy.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/default_policy.html b/doc/html/reference/aliases/default_policy.html
new file mode 100644
index 000000000..beadc3070
--- /dev/null
+++ b/doc/html/reference/aliases/default_policy.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>default_policy&lt;T, EC, EP&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/checked.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/outcome.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>default_policy&lt;T, EC, EP&gt;</code></h1></div></div></div>
+  <p>A type alias to a no-value policy selected based on traits matching of <code>T</code>, <code>EC</code> and <code>EP</code>. It is defined as follows:</p>
+
+<ol>
+<li><p>If <code>EC</code> and <code>EP</code> is <code>void</code>, choose <a href="../../reference/policies/terminate.html" class="api-reference"><code>terminate</code></a>
+.</p></li>
+
+<li><p>If <a href="../../reference/traits/is_error_code_available.html" class="api-reference"><code>is_error_code_available&lt;T&gt;</code></a>
+ true for <code>EC</code>, choose <a href="../../reference/policies/error_code_throw_as_system_error_outcome.html" class="api-reference"><code>error_code_throw_as_system_error&lt;T, EC, EP&gt;</code></a>
+ for <code>basic_outcome</code> or <a href="../../reference/policies/error_code_throw_as_system_error_result.html" class="api-reference"><code>error_code_throw_as_system_error&lt;T, EC, void&gt;</code></a>
+ for <code>basic_result</code>.</p></li>
+
+<li><p>If <a href="../../reference/traits/is_exception_ptr_available.html" class="api-reference"><code>is_exception_ptr_available&lt;T&gt;</code></a>
+ true for <code>EC</code> or <code>EP</code>, choose <a href="../../reference/policies/exception_ptr_rethrow_outcome.html" class="api-reference"><code>exception_ptr_rethrow&lt;T, EC, EP&gt;</code></a>
+ for <code>basic_outcome</code> or <a href="../../reference/policies/exception_ptr_rethrow_result.html" class="api-reference"><code>exception_ptr_rethrow&lt;T, EC, void&gt;</code></a>
+ for <code>basic_result</code>.</p></li>
+
+<li><p>Else choose <a href="../../reference/policies/fail_to_compile_observers.html" class="api-reference"><code>fail_to_compile_observers</code></a>
+, which fails the build with a useful message.</p></li>
+</ol>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 05, 2019 at 21:41:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/checked.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/outcome.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/outcome.html b/doc/html/reference/aliases/outcome.html
new file mode 100644
index 000000000..e3416422a
--- /dev/null
+++ b/doc/html/reference/aliases/outcome.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>outcome&lt;T, EC = varies, EP = varies, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/default_policy.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/result.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>outcome&lt;T, EC = varies, EP = varies, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></h1></div></div></div>
+  <p>A type alias to either <a href="../../reference/aliases/std_outcome.html" class="api-reference"><code>std_outcome&lt;T, EC = std::error_code, EP = std::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+ (standalone edition) or <a href="../../reference/aliases/boost_outcome.html" class="api-reference"><code>boost_outcome&lt;T, EC = boost::system::error_code, EP = boost::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+ (Boost edition), and <code>policy::</code><a href="../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy</code></a>
+. This means that <code>outcome&lt;T&gt;</code> uses the appropriate default alias depending on which edition of Outcome is in use.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 23:42:52 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/default_policy.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/result.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/result.html b/doc/html/reference/aliases/result.html
new file mode 100644
index 000000000..8d8852998
--- /dev/null
+++ b/doc/html/reference/aliases/result.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>result&lt;T, E = varies, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/std_checked.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>result&lt;T, E = varies, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></h1></div></div></div>
+  <p>A type alias to either <a href="../../reference/aliases/std_result.html" class="api-reference"><code>std_result&lt;T, E = std::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+ (standalone edition) or <a href="../../reference/aliases/boost_result.html" class="api-reference"><code>boost_result&lt;T, E = boost::system::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+ (Boost edition), and <code>policy::</code><a href="../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy</code></a>
+. This means that <code>result&lt;T&gt;</code> uses the appropriate default alias depending on which edition of Outcome is in use.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/std_checked.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/std_checked.html b/doc/html/reference/aliases/std_checked.html
new file mode 100644
index 000000000..bced7e934
--- /dev/null
+++ b/doc/html/reference/aliases/std_checked.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std_checked&lt;T, E = std::error_code&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/std_outcome.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std_checked&lt;T, E = std::error_code&gt;</code></h1></div></div></div>
+  <p>A type alias to a <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ configured with 
+<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code</code></a>
+ and <code>policy::</code><a href="../../reference/policies/throw_bad_result_access.html" class="api-reference"><code>throw_bad_result_access&lt;EC&gt;</code></a>
+.</p>
+
+<p>This type alias always references the <code>std</code> edition of things, unlike <a href="../../reference/aliases/checked.html" class="api-reference"><code>checked&lt;T, E = varies&gt;</code></a>
+ which references either this alias or <a href="../../reference/aliases/boost_checked.html" class="api-reference"><code>boost_checked&lt;T, E = boost::system::error_code&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 23, 2019 at 01:27:31 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/std_outcome.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/std_outcome.html b/doc/html/reference/aliases/std_outcome.html
new file mode 100644
index 000000000..8320e90fc
--- /dev/null
+++ b/doc/html/reference/aliases/std_outcome.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std_outcome&lt;T, EC = std::error_code, EP = std::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/std_checked.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/std_result.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std_outcome&lt;T, EC = std::error_code, EP = std::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></h1></div></div></div>
+  <p>A type alias to a <a href="../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+ configured with 
+<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code</code></a>
+, 
+<a href="https://en.cppreference.com/w/cpp/error/exception_ptr" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::exception_ptr</code></a>
+ and <code>policy::</code><a href="../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy</code></a>
+.</p>
+
+<p>This type alias always references the <code>std</code> edition of things, unlike <a href="../../reference/aliases/outcome.html" class="api-reference"><code>outcome&lt;T, EC = varies, EP = varies, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+ which references either this alias or <a href="../../reference/aliases/boost_outcome.html" class="api-reference"><code>boost_outcome&lt;T, EC = boost::system::error_code, EP = boost::exception_ptr, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/std_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 23:42:52 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/std_checked.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/std_result.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/std_result.html b/doc/html/reference/aliases/std_result.html
new file mode 100644
index 000000000..aab17bab1
--- /dev/null
+++ b/doc/html/reference/aliases/std_result.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std_result&lt;T, E = std::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/std_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/std_unchecked.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std_result&lt;T, E = std::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></h1></div></div></div>
+  <p>A type alias to a <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ configured with 
+<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code</code></a>
+ and <code>policy::</code><a href="../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy</code></a>
+.</p>
+
+<p>This type alias always references the <code>std</code> edition of things, unlike <a href="../../reference/aliases/result.html" class="api-reference"><code>result&lt;T, E = varies, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+ which references either this alias or <a href="../../reference/aliases/boost_result.html" class="api-reference"><code>boost_result&lt;T, E = boost::system::error_code, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/std_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/std_unchecked.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/std_unchecked.html b/doc/html/reference/aliases/std_unchecked.html
new file mode 100644
index 000000000..8d10050e4
--- /dev/null
+++ b/doc/html/reference/aliases/std_unchecked.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std_unchecked&lt;T, E = std::error_code&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/std_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/unchecked.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std_unchecked&lt;T, E = std::error_code&gt;</code></h1></div></div></div>
+  <p>A type alias to a <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ configured with 
+<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code</code></a>
+ and <code>policy::</code><a href="../../reference/policies/all_narrow.html" class="api-reference"><code>all_narrow</code></a>
+.</p>
+
+<p>This type alias always references the <code>std</code> edition of things, unlike <a href="../../reference/aliases/unchecked.html" class="api-reference"><code>unchecked&lt;T, E = varies&gt;</code></a>
+ which references either this alias or <a href="../../reference/aliases/boost_unchecked.html" class="api-reference"><code>boost_unchecked&lt;T, E = boost::system::error_code&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 23, 2019 at 01:27:31 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/std_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/aliases/unchecked.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/aliases/unchecked.html b/doc/html/reference/aliases/unchecked.html
new file mode 100644
index 000000000..ad76a2f79
--- /dev/null
+++ b/doc/html/reference/aliases/unchecked.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>unchecked&lt;T, E = varies&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/std_unchecked.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>unchecked&lt;T, E = varies&gt;</code></h1></div></div></div>
+  <p>A type alias to either <a href="../../reference/aliases/std_unchecked.html" class="api-reference"><code>std_unchecked&lt;T, E = std::error_code&gt;</code></a>
+ (standalone edition) or <a href="../../reference/aliases/boost_unchecked.html" class="api-reference"><code>boost_unchecked&lt;T, E = boost::system::error_code&gt;</code></a>
+ (Boost edition). This means that <code>unchecked&lt;T&gt;</code> uses the appropriate default alias depending on which edition of Outcome is in use.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/aliases/std_unchecked.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/aliases.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/concepts.html b/doc/html/reference/concepts.html
new file mode 100644
index 000000000..74115064e
--- /dev/null
+++ b/doc/html/reference/concepts.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Concepts - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../reference/macros/is_nothrow_swappable.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/concepts/basic_outcome.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Concepts</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../reference/concepts/basic_outcome.html" ><code>basic_outcome&lt;T&gt;</code></a>
+<p>A boolean concept matching types which are convertible to a <code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code>.</p><li>
+	<a href="../reference/concepts/basic_result.html" ><code>basic_result&lt;T&gt;</code></a>
+<p>A boolean concept matching types which are convertible to a <code>basic_result&lt;T, E, NoValuePolicy&gt;</code>.</p><li>
+	<a href="../reference/concepts/value_or_error.html" ><code>value_or_error&lt;T&gt;</code></a>
+<p>A boolean concept matching types with either a value or an error.</p><li>
+	<a href="../reference/concepts/value_or_none.html" ><code>value_or_none&lt;T&gt;</code></a>
+<p>A boolean concept matching types with an optional value.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 11, 2018 at 14:56:04 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../reference/macros/is_nothrow_swappable.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/concepts/basic_outcome.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/concepts/basic_outcome.html b/doc/html/reference/concepts/basic_outcome.html
new file mode 100644
index 000000000..1515294e9
--- /dev/null
+++ b/doc/html/reference/concepts/basic_outcome.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/concepts.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/concepts.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/concepts/basic_result.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome&lt;T&gt;</code></h1></div></div></div>
+  <p>If on C++ 20 or the Concepts TS is enabled, a boolean concept matching types which have <code>value_type</code>, <code>error_type</code> and <code>no_value_policy_type</code> member typedefs; that the type is convertible to <code>basic_result&lt;value_type, error_type, no_value_policy_type&gt;</code>; that <code>basic_result&lt;value_type, error_type, no_value_policy_type&gt;</code> is a base of the type.</p>
+
+<p>If without Concepts, a static constexpr bool which is true for types matching the same requirements, using a SFINAE based emulation.</p>
+
+<p>This concept matches any type which provides the same typedefs as a <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, has that <code>basic_result</code> as a base class, and is implicitly convertible to <code>basic_result</code>. Whilst not guaranteed, it is very likely that the type is a <code>basic_result</code>, or inherits publicly from a <code>basic_result</code>. If you want something which matches any value-or-error type, consider <a href="../../reference/concepts/value_or_error.html" class="api-reference"><code>value_or_error&lt;T&gt;</code></a>
+. If you want something which exactly matches <code>basic_outcome</code>, use <a href="../../reference/traits/is_basic_outcome.html" class="api-reference"><code>is_basic_outcome&lt;T&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::concepts</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: May 24, 2020 at 12:48:39 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/concepts.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/concepts.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/concepts/basic_result.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/concepts/basic_result.html b/doc/html/reference/concepts/basic_result.html
new file mode 100644
index 000000000..084b86c7f
--- /dev/null
+++ b/doc/html/reference/concepts/basic_result.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/concepts/basic_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/concepts.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/concepts/value_or_error.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result&lt;T&gt;</code></h1></div></div></div>
+  <p>If on C++ 20 or the Concepts TS is enabled, a boolean concept matching types which have <code>value_type</code>, <code>error_type</code> and <code>no_value_policy_type</code> member typedefs; that the type is convertible to <code>basic_result&lt;value_type, error_type, no_value_policy_type&gt;</code>; that <code>basic_result&lt;value_type, error_type, no_value_policy_type&gt;</code> is a base of the type.</p>
+
+<p>If without Concepts, a static constexpr bool which is true for types matching the same requirements, using a SFINAE based emulation.</p>
+
+<p>This concept matches any type which provides the same typedefs as a <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, has that <code>basic_result</code> as a base class, and is implicitly convertible to <code>basic_result</code>. Whilst not guaranteed, it is very likely that the type is a <code>basic_result</code>, or inherits publicly from a <code>basic_result</code>. If you want something which matches any value-or-error type, consider <a href="../../reference/concepts/value_or_error.html" class="api-reference"><code>value_or_error&lt;T&gt;</code></a>
+. If you want something which exactly matches <code>basic_result</code>, use <a href="../../reference/traits/is_basic_result.html" class="api-reference"><code>is_basic_result&lt;T&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::concepts</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: May 24, 2020 at 12:48:39 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/concepts/basic_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/concepts.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/concepts/value_or_error.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/concepts/value_or_error.html b/doc/html/reference/concepts/value_or_error.html
new file mode 100644
index 000000000..b41158091
--- /dev/null
+++ b/doc/html/reference/concepts/value_or_error.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_or_error&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/concepts/basic_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/concepts.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/concepts/value_or_none.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_or_error&lt;T&gt;</code></h1></div></div></div>
+  <p>If on C++ 20 or the Concepts TS is enabled, a boolean concept matching types with a public <code>.has_value()</code> observer which returns <code>bool</code>, a public <code>.value()</code> observer function, and a public <code>.error()</code> observer function.</p>
+
+<p>If without Concepts, a static constexpr bool which is true for types matching the same requirements, using a SFINAE based emulation.</p>
+
+<p>This concept matches expected-like types such as 
+<a href="https://wg21.link/P0323" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> P0323 <code>std::expected&lt;T, E&gt;</code></a>
+, one of which is <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+. Be aware it does not differentiate between value-<em>or</em>-error types and value-<em>and</em>-error types if they present the interface matched above.</p>
+
+<p>If you want a concept matching specifically <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, see <a href="../../reference/concepts/basic_result.html" class="api-reference"><code>basic_result&lt;T&gt;</code></a>
+.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::concepts</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/convert.hpp&gt;</code></p>
+
+<p><em>Legacy</em>: This was named <code>convert::ValueOrError&lt;T&gt;</code> in Outcome v2.1 and earlier. Define <a href="../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ to less than <code>220</code> to enable.</p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/concepts/basic_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/concepts.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/concepts/value_or_none.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/concepts/value_or_none.html b/doc/html/reference/concepts/value_or_none.html
new file mode 100644
index 000000000..94709dd5a
--- /dev/null
+++ b/doc/html/reference/concepts/value_or_none.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_or_none&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/concepts/value_or_error.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/concepts.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/converters.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_or_none&lt;T&gt;</code></h1></div></div></div>
+  <p>If on C++ 20 or the Concepts TS is enabled, a boolean concept matching types with a public <code>.has_value()</code> observer which returns <code>bool</code>, and a public <code>.value()</code> observer function.</p>
+
+<p>If without Concepts, a static constexpr bool which is true for types matching the same requirements, using a SFINAE based emulation.</p>
+
+<p>This concept matches optional-like types such as 
+<a href="https://en.cppreference.com/w/cpp/utility/optional" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::optional&lt;T&gt;</code></a>
+. Note it also matches 
+<a href="https://wg21.link/P0323" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> P0323 <code>std::expected&lt;T, E&gt;</code></a>
+, which also has an optional-like interface. You may thus wish to preferentially match <a href="../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" class="api-reference"><code>concepts::value_or_error&lt;T, E&gt;</code></a>
+ for any given <code>T</code>.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::concepts</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/convert.hpp&gt;</code></p>
+
+<p><em>Legacy</em>: This was named <code>convert::ValueOrNone&lt;T&gt;</code> in Outcome v2.1 and earlier. Define <a href="../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ to less than <code>220</code> to enable.</p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/concepts/value_or_error.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/concepts.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/converters.html b/doc/html/reference/converters.html
new file mode 100644
index 000000000..f9d487835
--- /dev/null
+++ b/doc/html/reference/converters.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Converters - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../reference/concepts/value_or_none.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/converters/value_or_error.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Converters</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../reference/converters/value_or_error.html" ><code>value_or_error&lt;T, U&gt;</code></a>
+<p>A customisable converter of <code>value_or_error&lt;T, E&gt;</code> concept matching types.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 15, 2018 at 17:49:37 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../reference/concepts/value_or_none.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/converters/value_or_error.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/converters/value_or_error.html b/doc/html/reference/converters/value_or_error.html
new file mode 100644
index 000000000..983a941ea
--- /dev/null
+++ b/doc/html/reference/converters/value_or_error.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_or_error&lt;T, U&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/converters.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/converters.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/traits.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_or_error&lt;T, U&gt;</code></h1></div></div></div>
+  <p>A customisable converter of <a href="../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" class="api-reference"><code>concepts::value_or_error&lt;T, E&gt;</code></a>
+ concept matching types. It must have the following form:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// `T` will be the destination basic_result or basic_outcome.
+</span><span class="c1">// `U` will be the decayed form of the `value_or_error&lt;T, E&gt;` concept matching input type.
+</span><span class="c1"></span><span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span> <span class="k">struct</span> <span class="n">value_or_error</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">U</span><span class="o">&gt;</span>
+<span class="p">{</span>
+  <span class="c1">// False to indicate that this converter wants `basic_result`/`basic_outcome` to reject all other `basic_result`
+</span><span class="c1"></span>  <span class="k">static</span> <span class="k">constexpr</span> <span class="kt">bool</span> <span class="n">enable_result_inputs</span> <span class="o">=</span> <span class="nb">false</span><span class="p">;</span>
+  <span class="c1">// False to indicate that this converter wants `basic_outcome` to reject all other `basic_outcome`
+</span><span class="c1"></span>  <span class="k">static</span> <span class="k">constexpr</span> <span class="kt">bool</span> <span class="n">enable_outcome_inputs</span> <span class="o">=</span> <span class="nb">false</span><span class="p">;</span>
+  
+  <span class="c1">// `X` will be the raw input form of `U`. It must return a `T`.
+</span><span class="c1"></span>  <span class="k">template</span><span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">X</span><span class="o">&gt;</span> <span class="k">constexpr</span> <span class="n">T</span> <span class="k">operator</span><span class="p">()(</span><span class="n">X</span> <span class="o">&amp;&amp;</span><span class="n">v</span><span class="p">);</span>
+<span class="p">};</span>
+</code></pre></div>
+<p><em>Overridable</em>: By template specialisation into the <code>convert</code> namespace.</p>
+
+<p><em>Default</em>: If decayed <code>X</code> is same as <code>U</code>, concept <code>value_or_error&lt;U&gt;</code> matches, <code>X::value_type</code> is <code>void</code> or is explicitly constructible to <code>T::value_type</code>, and <code>X::error_type</code> is <code>void</code> or is explicitly constructible to <code>T::error_type</code>, then <code>operator()(X &amp;&amp;)</code> is made available.</p>
+
+<p><code>operator()(X &amp;&amp;v)</code> tests if <code>v.has_value()</code> is true, if so then a <code>T</code> with successful value is returned, else a <code>T</code> with unsuccessful value. If the input type was <code>void</code>, a default constructed value is used for either, else a move/copy construction from the source is performed.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::convert</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/convert.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/converters.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/converters.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/traits.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions.html b/doc/html/reference/functions.html
new file mode 100644
index 000000000..6e41bf000
--- /dev/null
+++ b/doc/html/reference/functions.html
@@ -0,0 +1,106 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Functions - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../reference/aliases/unchecked.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/functions/hooks.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Functions</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../reference/functions/hooks.html" >Hooks</a>
+<p>Functions used to hook into the functionality of <code>basic_result</code> and <code>basic_outcome</code>.</p><ol><li>
+	<a href="../reference/functions/hooks/spare_storage.html" ><code>uint16_t spare_storage(const basic_result|basic_outcome *) noexcept</code></a>
+<p>Returns the sixteen bits of spare storage in the specified result or outcome.</p><li>
+	<a href="../reference/functions/hooks/hook_outcome_construction.html" ><code>void hook_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the implicit constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/functions/hooks/hook_outcome_construction2.html" ><code>void hook_outcome_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the implicit constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/functions/hooks/hook_outcome_copy_construction.html" ><code>void hook_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting copy constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/functions/hooks/hook_outcome_copy_construction2.html" ><code>void hook_outcome_copy_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting copy constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/functions/hooks/hook_outcome_in_place_construction.html" ><code>void hook_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the in-place constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/functions/hooks/hook_outcome_move_construction.html" ><code>void hook_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting move constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/functions/hooks/hook_outcome_move_construction2.html" ><code>void hook_outcome_move_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting move constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/functions/hooks/hook_result_construction.html" ><code>void hook_result_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the implicit constructors of <code>basic_result</code>.</p><li>
+	<a href="../reference/functions/hooks/hook_result_copy_construction.html" ><code>void hook_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting copy constructors of <code>basic_result</code>.</p><li>
+	<a href="../reference/functions/hooks/hook_result_in_place_construction.html" ><code>void hook_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the in-place constructors of <code>basic_result</code>.</p><li>
+	<a href="../reference/functions/hooks/hook_result_move_construction.html" ><code>void hook_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting move constructors of <code>basic_result</code>.</p><li>
+	<a href="../reference/functions/hooks/override_outcome_exception.html" ><code>void override_outcome_exception(basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; *, U &amp;&amp;) noexcept</code></a>
+<p>Overrides the exception to something other than what was constructed.</p><li>
+	<a href="../reference/functions/hooks/set_spare_storage.html" ><code>void set_spare_storage(basic_result|basic_outcome *, uint16_t) noexcept</code></a>
+<p>Sets the sixteen bits of spare storage in the specified result or outcome.</p></li></ol><li>
+	<a href="../reference/functions/iostream.html" >Iostream</a>
+<p>Functions used to print, serialise and deserialise <code>basic_result</code> and <code>basic_outcome</code>.</p><ol><li>
+	<a href="../reference/functions/iostream/outcome_operator_in.html" ><code>std::istream &amp;operator&gt;&gt;(std::istream &amp;, basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;)</code></a>
+<p>Deserialises a <code>basic_outcome</code> from a <code>std::istream</code>.</p><li>
+	<a href="../reference/functions/iostream/result_operator_in.html" ><code>std::istream &amp;operator&gt;&gt;(std::istream &amp;, basic_result&lt;T, E, NoValuePolicy&gt; &amp;)</code></a>
+<p>Deserialises a <code>basic_result</code> from a <code>std::istream</code>.</p><li>
+	<a href="../reference/functions/iostream/outcome_operator_out.html" ><code>std::ostream &amp;operator&lt;&lt;(std::ostream &amp;, const basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;)</code></a>
+<p>Serialises a <code>basic_outcome</code> to a <code>std::ostream</code>.</p><li>
+	<a href="../reference/functions/iostream/result_operator_out.html" ><code>std::ostream &amp;operator&lt;&lt;(std::ostream &amp;, const basic_result&lt;T, E, NoValuePolicy&gt; &amp;)</code></a>
+<p>Serialises a <code>basic_result</code> to a <code>std::ostream</code>.</p><li>
+	<a href="../reference/functions/iostream/outcome_print.html" ><code>std::string print(const basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;)</code></a>
+<p>Returns a string containing a human readable rendition of the <code>basic_outcome</code>.</p><li>
+	<a href="../reference/functions/iostream/result_print.html" ><code>std::string print(const basic_result&lt;T, E, NoValuePolicy&gt; &amp;)</code></a>
+<p>Returns a string containing a human readable rendition of the <code>basic_result</code>.</p></li></ol><li>
+	<a href="../reference/functions/policy.html" >Policy</a>
+<p>Functions used to customise how the policy classes operate.</p><ol><li>
+	<a href="../reference/functions/policy/basic_outcome_failure_exception_from_error.html" ><code>auto basic_outcome_failure_exception_from_error(const EC &amp;)</code></a>
+<p>ADL discovered free function synthesising an exception type from an error type, used by the <code>.failure()</code> observers.</p><li>
+	<a href="../reference/functions/policy/error_code.html" ><code>decltype(auto) error_code(T &amp;&amp;)</code></a>
+<p>Extracts a <code>boost::system::error_code</code> or <code>std::error_code</code> from the input via ADL discovery of a suitable <code>make_error_code(T)</code> function.</p><li>
+	<a href="../reference/functions/policy/exception_ptr.html" ><code>decltype(auto) exception_ptr(T &amp;&amp;)</code></a>
+<p>Extracts a <code>boost::exception_ptr</code> or <code>std::exception_ptr</code> from the input via ADL discovery of a suitable <code>make_exception_ptr(T)</code> function.</p><li>
+	<a href="../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_enum.html" ><code>void outcome_throw_as_system_error_with_payload(BoostErrorCodeEnum &amp;&amp;)</code></a>
+<p>Specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for input types where <code>boost::system::is_error_code_enum&lt;BoostErrorCodeEnum&gt;</code> or <code>boost::system::is_error_condition_enum&lt;BoostErrorCodeEnum&gt;</code> is true.</p><li>
+	<a href="../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_enum.html" ><code>void outcome_throw_as_system_error_with_payload(ErrorCodeEnum &amp;&amp;)</code></a>
+<p>Specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for input types where <code>std::is_error_code_enum&lt;ErrorCodeEnum&gt;</code> or <code>std::is_error_condition_enum&lt;ErrorCodeEnum&gt;</code> is true.</p><li>
+	<a href="../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_error_code.html" ><code>void outcome_throw_as_system_error_with_payload(const boost::system::error_code &amp;)</code></a>
+<p>Specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for <code>boost::system::error_code</code>.</p><li>
+	<a href="../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_error_code.html" ><code>void outcome_throw_as_system_error_with_payload(const std::error_code &amp;)</code></a>
+<p>Specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for <code>std::error_code</code>.</p></li></ol><li>
+	<a href="../reference/functions/failure.html" ><code>auto failure(T &amp;&amp;, ...)</code></a>
+<p>Returns appropriate type sugar for constructing an unsuccessful result or outcome.</p><li>
+	<a href="../reference/functions/success.html" ><code>auto success(T &amp;&amp;, ...)</code></a>
+<p>Returns appropriate type sugar for constructing a successful result or outcome.</p><li>
+	<a href="../reference/functions/try_operation_has_value.html" ><code>bool try_operation_has_value(X)</code></a>
+<p>Default implementation of <code>try_operation_has_value(X)</code> ADL customisation point for <code>BOOST_OUTCOME_TRY</code>.</p><li>
+	<a href="../reference/functions/try_operation_extract_value.html" ><code>decltype(auto) try_operation_extract_value(X)</code></a>
+<p>Default implementation of <code>try_operation_extract_value(X)</code> ADL customisation point for <code>BOOST_OUTCOME_TRY</code>.</p><li>
+	<a href="../reference/functions/try_operation_return_as.html" ><code>decltype(auto) try_operation_return_as(X)</code></a>
+<p>Default implementation of <code>try_operation_return_as(X)</code> ADL customisation point for <code>BOOST_OUTCOME_TRY</code>.</p><li>
+	<a href="../reference/functions/error_from_exception.html" ><code>std::error_code error_from_exception(std::exception_ptr &amp;&amp;ep = std::current_exception(), std::error_code not_matched = std::make_error_code(std::errc::resource_unavailable_try_again)) noexcept</code></a>
+<p>Returns an error code matching a thrown standard library exception.</p><li>
+	<a href="../reference/functions/strong_swap.html" ><code>void strong_swap(bool &amp;all_good, T &amp;a, T &amp;b)</code></a>
+<p>Tries to perform a strong guarantee swap.</p><li>
+	<a href="../reference/functions/try_throw_std_exception_from_error.html" ><code>void try_throw_std_exception_from_error(std::error_code ec, const std::string &amp;msg = std::string{})</code></a>
+<p>Try to throw a standard library exception type matching an error code.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 13, 2018 at 21:10:19 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../reference/aliases/unchecked.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/functions/hooks.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/error_from_exception.html b/doc/html/reference/functions/error_from_exception.html
new file mode 100644
index 000000000..9977b400e
--- /dev/null
+++ b/doc/html/reference/functions/error_from_exception.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std::error_code error_from_exception(std::exception_ptr &amp;&amp;ep = std::current_exception(), std::error_code not_matched = std::make_error_code(std::errc::resource_unavailable_try_again)) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/try_operation_return_as.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/strong_swap.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std::error_code error_from_exception(std::exception_ptr &amp;&amp;ep = std::current_exception(), std::error_code not_matched = std::make_error_code(std::errc::resource_unavailable_try_again)) noexcept</code></h1></div></div></div>
+  <p>This function saves writing boilerplate by rethrowing <code>ep</code> within a <code>try</code>
+block, with a long sequence of <code>catch()</code> handlers, one for every standard
+C++ exception type which has a near or exact equivalent code in 
+<a href="https://en.cppreference.com/w/cpp/error/errc" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::errc</code></a>
+.</p>
+
+<p>If matched, <code>ep</code> is set to a default constructed 
+<a href="https://en.cppreference.com/w/cpp/error/exception_ptr" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::exception_ptr</code></a>
+,
+and a 
+<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code</code></a>
+ is constructed using the ADL discovered free
+function <code>make_error_code()</code> upon the <code>std::errc</code> enumeration value matching the
+thrown exception.</p>
+
+<p>If not matched, <code>ep</code> is left intact, and the <code>not_matched</code> error code supplied
+is returned instead.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: C++ exceptions to be globally enabled.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/utils.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 23:42:52 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/try_operation_return_as.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/strong_swap.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/failure.html b/doc/html/reference/functions/failure.html
new file mode 100644
index 000000000..183244e6e
--- /dev/null
+++ b/doc/html/reference/functions/failure.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>auto failure(T &amp;&amp;, &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_error_code.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/success.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>auto failure(T &amp;&amp;, ...)</code></h1></div></div></div>
+  <p>Returns appropriate type sugar for constructing an unsuccessful result or outcome, usually <a href="../../reference/types/failure_type.html" class="api-reference"><code>failure_type&lt;EC, EP = void&gt;</code></a>
+ with a decayed <code>T</code>.</p>
+
+<p>Two default overloads are provided, one taking a single required parameter with optional spare storage value parameter returning <code>failure_type&lt;std::decay_t&lt;T&gt;&gt;</code>, the other taking two required parameters with optional spare storage value parameter returning <code>failure_type&lt;std::decay_t&lt;T&gt;, std::decay_t&lt;U&gt;&gt;</code>. Both overloads perfectly forward their inputs.</p>
+
+<p>Note that <code>failure()</code> overloads are permitted by Outcome to return something other than <code>failure_type</code>. For example, <code>basic_result</code>&rsquo;s <a href="../../reference/types/basic_result/as_failure_lvalue.html" class="api-reference"><code>auto as_failure() const &amp;</code></a>
+ returns whatever type <code>failure()</code> returns, and <a href="../../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+ by default returns for failure whatever <code>.as_failure()</code> returns. This can be useful to have <code>BOOST_OUTCOME_TRY(...}</code> propagate on failure something custom for some specific input <code>basic_result</code> or <code>basic_outcome</code>.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup (ADL).</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/success_failure.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 23, 2021 at 17:37:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_error_code.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/success.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks.html b/doc/html/reference/functions/hooks.html
new file mode 100644
index 000000000..585b2731f
--- /dev/null
+++ b/doc/html/reference/functions/hooks.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Hooks - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/hooks/spare_storage.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Hooks</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../../reference/functions/hooks/spare_storage.html" ><code>uint16_t spare_storage(const basic_result|basic_outcome *) noexcept</code></a>
+<p>Returns the sixteen bits of spare storage in the specified result or outcome.</p><li>
+	<a href="../../reference/functions/hooks/hook_outcome_construction.html" ><code>void hook_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the implicit constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../../reference/functions/hooks/hook_outcome_construction2.html" ><code>void hook_outcome_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the implicit constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../../reference/functions/hooks/hook_outcome_copy_construction.html" ><code>void hook_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting copy constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../../reference/functions/hooks/hook_outcome_copy_construction2.html" ><code>void hook_outcome_copy_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting copy constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../../reference/functions/hooks/hook_outcome_in_place_construction.html" ><code>void hook_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the in-place constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../../reference/functions/hooks/hook_outcome_move_construction.html" ><code>void hook_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting move constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../../reference/functions/hooks/hook_outcome_move_construction2.html" ><code>void hook_outcome_move_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting move constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../../reference/functions/hooks/hook_result_construction.html" ><code>void hook_result_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the implicit constructors of <code>basic_result</code>.</p><li>
+	<a href="../../reference/functions/hooks/hook_result_copy_construction.html" ><code>void hook_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting copy constructors of <code>basic_result</code>.</p><li>
+	<a href="../../reference/functions/hooks/hook_result_in_place_construction.html" ><code>void hook_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the in-place constructors of <code>basic_result</code>.</p><li>
+	<a href="../../reference/functions/hooks/hook_result_move_construction.html" ><code>void hook_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(Until v2.2.0) ADL discovered free function hook invoked by the converting move constructors of <code>basic_result</code>.</p><li>
+	<a href="../../reference/functions/hooks/override_outcome_exception.html" ><code>void override_outcome_exception(basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; *, U &amp;&amp;) noexcept</code></a>
+<p>Overrides the exception to something other than what was constructed.</p><li>
+	<a href="../../reference/functions/hooks/set_spare_storage.html" ><code>void set_spare_storage(basic_result|basic_outcome *, uint16_t) noexcept</code></a>
+<p>Sets the sixteen bits of spare storage in the specified result or outcome.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/hooks/spare_storage.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_outcome_construction.html b/doc/html/reference/functions/hooks/hook_outcome_construction.html
new file mode 100644
index 000000000..ae806c747
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_outcome_construction.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_outcome_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/spare_storage.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_outcome_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_outcome_construction.html" class="api-reference"><code>on_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the implicit constructors of <code>basic_outcome</code>. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/spare_storage.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_outcome_construction2.html b/doc/html/reference/functions/hooks/hook_outcome_construction2.html
new file mode 100644
index 000000000..9e3303fb6
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_outcome_construction2.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_outcome_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_copy_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_outcome_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_outcome_construction2.html" class="api-reference"><code>on_outcome_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the implicit constructors of <code>basic_outcome</code> which consume two arguments. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_copy_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_outcome_copy_construction.html b/doc/html/reference/functions/hooks/hook_outcome_copy_construction.html
new file mode 100644
index 000000000..0409c884e
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_outcome_copy_construction.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_outcome_copy_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_copy_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_outcome_copy_construction.html" class="api-reference"><code>on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting copy constructors of <code>basic_outcome</code> (NOT the standard copy constructor). See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_copy_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_outcome_copy_construction2.html b/doc/html/reference/functions/hooks/hook_outcome_copy_construction2.html
new file mode 100644
index 000000000..75cebdf2e
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_outcome_copy_construction2.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_outcome_copy_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_copy_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_in_place_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_outcome_copy_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_outcome_copy_construction2.html" class="api-reference"><code>on_outcome_copy_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting copy constructors of <code>basic_outcome</code> (NOT the standard copy constructor) which consume two arguments. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_copy_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_in_place_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_outcome_in_place_construction.html b/doc/html/reference/functions/hooks/hook_outcome_in_place_construction.html
new file mode 100644
index 000000000..203746a83
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_outcome_in_place_construction.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;&hellip;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_copy_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_move_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_outcome_in_place_construction.html" class="api-reference"><code>on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the in-place constructors of <code>basic_outcome</code>. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_copy_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_move_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_outcome_move_construction.html b/doc/html/reference/functions/hooks/hook_outcome_move_construction.html
new file mode 100644
index 000000000..0780efd06
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_outcome_move_construction.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_outcome_move_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_in_place_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_move_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_outcome_move_construction.html" class="api-reference"><code>on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting move constructors of <code>basic_outcome</code> (NOT the standard move constructor). See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_in_place_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_move_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_outcome_move_construction2.html b/doc/html/reference/functions/hooks/hook_outcome_move_construction2.html
new file mode 100644
index 000000000..077cafd90
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_outcome_move_construction2.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_outcome_move_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_move_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_result_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_outcome_move_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_outcome_move_construction2.html" class="api-reference"><code>on_outcome_move_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting move constructors of <code>basic_outcome</code> (NOT the standard move constructor) which consume two arguments. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_move_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_result_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_result_construction.html b/doc/html/reference/functions/hooks/hook_result_construction.html
new file mode 100644
index 000000000..252edd30d
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_result_construction.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_result_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_move_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_result_copy_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_result_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_result_construction.html" class="api-reference"><code>on_result_construction(T *, U &amp;&amp;) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, generally invoked by the implicit constructors of <code>basic_result</code>. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_outcome_move_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_result_copy_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_result_copy_construction.html b/doc/html/reference/functions/hooks/hook_result_copy_construction.html
new file mode 100644
index 000000000..54c16db3e
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_result_copy_construction.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_result_copy_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_result_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_result_in_place_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_result_copy_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_result_copy_construction.html" class="api-reference"><code>on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting copy constructors of <code>basic_result</code> (NOT the standard copy constructor). See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_result_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_result_in_place_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_result_in_place_construction.html b/doc/html/reference/functions/hooks/hook_result_in_place_construction.html
new file mode 100644
index 000000000..77655e9b0
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_result_in_place_construction.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;&hellip;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_result_copy_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_result_move_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_result_in_place_construction.html" class="api-reference"><code>on_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, generally invoked by the in-place constructors of <code>basic_result</code>. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_result_copy_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_result_move_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/hook_result_move_construction.html b/doc/html/reference/functions/hooks/hook_result_move_construction.html
new file mode 100644
index 000000000..6765b889e
--- /dev/null
+++ b/doc/html/reference/functions/hooks/hook_result_move_construction.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void hook_result_move_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_result_in_place_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/override_outcome_exception.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void hook_result_move_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Removed in Outcome v2.2.0, unless <a href="../../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+ is set to less than <code>220</code> to
+enable emulation. Use <a href="../../../reference/policies/base/on_result_move_construction.html" class="api-reference"><code>on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ instead in new code.</p>
+
+<p>One of the constructor hooks for <a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting move constructors of <code>basic_result</code> (NOT the standard move constructor). See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 19, 2020 at 12:15:40 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_result_in_place_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/override_outcome_exception.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/override_outcome_exception.html b/doc/html/reference/functions/hooks/override_outcome_exception.html
new file mode 100644
index 000000000..9ae544642
--- /dev/null
+++ b/doc/html/reference/functions/hooks/override_outcome_exception.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void override_outcome_exception(basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_result_move_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/set_spare_storage.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void override_outcome_exception(basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Overrides the exception to something other than what was constructed. You <em>almost certainly</em> never
+want to use this function. A much better way of overriding the exception returned is to create
+a custom no-value policy which lazily synthesises a custom exception object at the point of need.</p>
+
+<p>The only reason that this function exists is because some people have very corner case needs
+where a custom no-value policy can&rsquo;t be used, and where move-constructing a new <code>outcome</code> from
+an old <code>outcome</code> with the exception state replaced isn&rsquo;t possible (e.g. when the types are
+non-copyable and non-moveable).</p>
+
+<p>Unless you are in a situation where no other viable alternative exists, do not use this function.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 30, 2019 at 16:16:10 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/hook_result_move_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/set_spare_storage.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/set_spare_storage.html b/doc/html/reference/functions/hooks/set_spare_storage.html
new file mode 100644
index 000000000..6780b7c36
--- /dev/null
+++ b/doc/html/reference/functions/hooks/set_spare_storage.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void set_spare_storage(basic_result|basic_outcome *, uint16_t) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/override_outcome_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void set_spare_storage(basic_result|basic_outcome *, uint16_t) noexcept</code></h1></div></div></div>
+  <p>Sets the sixteen bits of spare storage in the specified result or outcome. You can retrieve these bits later using <a href="../../../reference/functions/hooks/spare_storage.html" class="api-reference"><code>uint16_t spare_storage(const basic_result|basic_outcome *) noexcept</code></a>
+.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 21, 2019 at 18:00:41 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks/override_outcome_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/hooks/spare_storage.html b/doc/html/reference/functions/hooks/spare_storage.html
new file mode 100644
index 000000000..20c9f2643
--- /dev/null
+++ b/doc/html/reference/functions/hooks/spare_storage.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>uint16_t spare_storage(const basic_result|basic_outcome *) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>uint16_t spare_storage(const basic_result|basic_outcome *) noexcept</code></h1></div></div></div>
+  <p>Returns the sixteen bits of spare storage in the specified result or outcome. You can set these bits using <a href="../../../reference/functions/hooks/set_spare_storage.html" class="api-reference"><code>void set_spare_storage(basic_result|basic_outcome *, uint16_t) noexcept</code></a>
+.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::hooks</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 21, 2019 at 18:00:41 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/hooks.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/hooks/hook_outcome_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/iostream.html b/doc/html/reference/functions/iostream.html
new file mode 100644
index 000000000..05c116742
--- /dev/null
+++ b/doc/html/reference/functions/iostream.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Iostream - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/hooks/set_spare_storage.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/iostream/outcome_operator_in.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Iostream</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../../reference/functions/iostream/outcome_operator_in.html" ><code>std::istream &amp;operator&gt;&gt;(std::istream &amp;, basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;)</code></a>
+<p>Deserialises a <code>basic_outcome</code> from a <code>std::istream</code>.</p><li>
+	<a href="../../reference/functions/iostream/result_operator_in.html" ><code>std::istream &amp;operator&gt;&gt;(std::istream &amp;, basic_result&lt;T, E, NoValuePolicy&gt; &amp;)</code></a>
+<p>Deserialises a <code>basic_result</code> from a <code>std::istream</code>.</p><li>
+	<a href="../../reference/functions/iostream/outcome_operator_out.html" ><code>std::ostream &amp;operator&lt;&lt;(std::ostream &amp;, const basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;)</code></a>
+<p>Serialises a <code>basic_outcome</code> to a <code>std::ostream</code>.</p><li>
+	<a href="../../reference/functions/iostream/result_operator_out.html" ><code>std::ostream &amp;operator&lt;&lt;(std::ostream &amp;, const basic_result&lt;T, E, NoValuePolicy&gt; &amp;)</code></a>
+<p>Serialises a <code>basic_result</code> to a <code>std::ostream</code>.</p><li>
+	<a href="../../reference/functions/iostream/outcome_print.html" ><code>std::string print(const basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;)</code></a>
+<p>Returns a string containing a human readable rendition of the <code>basic_outcome</code>.</p><li>
+	<a href="../../reference/functions/iostream/result_print.html" ><code>std::string print(const basic_result&lt;T, E, NoValuePolicy&gt; &amp;)</code></a>
+<p>Returns a string containing a human readable rendition of the <code>basic_result</code>.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: March 03, 2019 at 21:04:29 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/hooks/set_spare_storage.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/iostream/outcome_operator_in.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/iostream/outcome_operator_in.html b/doc/html/reference/functions/iostream/outcome_operator_in.html
new file mode 100644
index 000000000..2f9760603
--- /dev/null
+++ b/doc/html/reference/functions/iostream/outcome_operator_in.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std::istream &amp;operator&gt;&gt;(std::istream &amp;, basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream/result_operator_in.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std::istream &amp;operator&gt;&gt;(std::istream &amp;, basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;)</code></h1></div></div></div>
+  <p>Deserialises a <code>basic_outcome</code> from a <code>std::istream</code>.</p>
+
+<p>Serialisation format is:</p>
+
+<pre><code>&lt;unsigned int flags&gt;&lt;space&gt;&lt;value_type if set and not void&gt;&lt;error_type if set and not void&gt;&lt;exception_type if set and not void&gt;
+</code></pre>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: That <code>operator&gt;&gt;</code> is a valid expression for <code>std::istream</code> and <code>T</code>, <code>EC</code> and <code>EP</code>.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/iostream_support.hpp&gt;</code> (must be explicitly included manually).</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 21:04:29 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream/result_operator_in.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/iostream/outcome_operator_out.html b/doc/html/reference/functions/iostream/outcome_operator_out.html
new file mode 100644
index 000000000..a98701d48
--- /dev/null
+++ b/doc/html/reference/functions/iostream/outcome_operator_out.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std::ostream &amp;operator&lt;&lt;(std::ostream &amp;, const basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream/result_operator_in.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream/result_operator_out.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std::ostream &amp;operator&lt;&lt;(std::ostream &amp;, const basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;)</code></h1></div></div></div>
+  <p>Serialises a <code>basic_outcome</code> to a <code>std::ostream</code>.</p>
+
+<p>Serialisation format is:</p>
+
+<pre><code>&lt;unsigned int flags&gt;&lt;space&gt;&lt;value_type if set and not void&gt;&lt;error_type if set and not void&gt;&lt;exception_type if set and not void&gt;
+</code></pre>
+
+<p>This is the <strong>wrong</strong> function to use if you wish to print human readable output.
+Use <a href="../../../reference/functions/iostream/outcome_print.html" class="api-reference"><code>std::string print(const basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;)</code></a>
+ instead.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: That <code>operator&lt;&lt;</code> is a valid expression for <code>std::ostream</code> and <code>T</code>, <code>EC</code> and <code>EP</code>.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/iostream_support.hpp&gt;</code> (must be explicitly included manually).</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 21:04:29 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream/result_operator_in.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream/result_operator_out.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/iostream/outcome_print.html b/doc/html/reference/functions/iostream/outcome_print.html
new file mode 100644
index 000000000..994262573
--- /dev/null
+++ b/doc/html/reference/functions/iostream/outcome_print.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std::string print(const basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream/result_operator_out.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream/result_print.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std::string print(const basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; &amp;)</code></h1></div></div></div>
+  <p>Returns a string containing a human readable rendition of the <code>basic_outcome</code>.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/iostream_support.hpp&gt;</code> (must be explicitly included manually).</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 21:04:29 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream/result_operator_out.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream/result_print.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/iostream/result_operator_in.html b/doc/html/reference/functions/iostream/result_operator_in.html
new file mode 100644
index 000000000..2503285ac
--- /dev/null
+++ b/doc/html/reference/functions/iostream/result_operator_in.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std::istream &amp;operator&gt;&gt;(std::istream &amp;, basic_result&lt;T, E, NoValuePolicy&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream/outcome_operator_in.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream/outcome_operator_out.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std::istream &amp;operator&gt;&gt;(std::istream &amp;, basic_result&lt;T, E, NoValuePolicy&gt; &amp;)</code></h1></div></div></div>
+  <p>Deserialises a <code>basic_result</code> from a <code>std::istream</code>.</p>
+
+<p>Serialisation format is:</p>
+
+<pre><code>&lt;unsigned int flags&gt;&lt;space&gt;&lt;value_type if set and not void&gt;&lt;error_type if set and not void&gt;
+</code></pre>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: That <code>operator&gt;&gt;</code> is a valid expression for <code>std::istream</code> and <code>T</code> and <code>E</code>.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/iostream_support.hpp&gt;</code> (must be explicitly included manually).</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 21:04:29 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream/outcome_operator_in.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream/outcome_operator_out.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/iostream/result_operator_out.html b/doc/html/reference/functions/iostream/result_operator_out.html
new file mode 100644
index 000000000..eb96de670
--- /dev/null
+++ b/doc/html/reference/functions/iostream/result_operator_out.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std::ostream &amp;operator&lt;&lt;(std::ostream &amp;, const basic_result&lt;T, E, NoValuePolicy&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream/outcome_operator_out.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream/outcome_print.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std::ostream &amp;operator&lt;&lt;(std::ostream &amp;, const basic_result&lt;T, E, NoValuePolicy&gt; &amp;)</code></h1></div></div></div>
+  <p>Serialises a <code>basic_result</code> to a <code>std::ostream</code>.</p>
+
+<p>Serialisation format is:</p>
+
+<pre><code>&lt;unsigned int flags&gt;&lt;space&gt;&lt;value_type if set and not void&gt;&lt;error_type if set and not void&gt;
+</code></pre>
+
+<p>This is the <strong>wrong</strong> function to use if you wish to print human readable output.
+Use <a href="../../../reference/functions/iostream/result_print.html" class="api-reference"><code>std::string print(const basic_result&lt;T, E, NoValuePolicy&gt; &amp;)</code></a>
+ instead.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: That <code>operator&lt;&lt;</code> is a valid expression for <code>std::ostream</code> and <code>T</code> and <code>E</code>.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/iostream_support.hpp&gt;</code> (must be explicitly included manually).</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 21:04:29 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream/outcome_operator_out.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/iostream/outcome_print.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/iostream/result_print.html b/doc/html/reference/functions/iostream/result_print.html
new file mode 100644
index 000000000..1ea9ce048
--- /dev/null
+++ b/doc/html/reference/functions/iostream/result_print.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>std::string print(const basic_result&lt;T, E, NoValuePolicy&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream/outcome_print.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>std::string print(const basic_result&lt;T, E, NoValuePolicy&gt; &amp;)</code></h1></div></div></div>
+  <p>Returns a string containing a human readable rendition of the <code>basic_result</code>.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/iostream_support.hpp&gt;</code> (must be explicitly included manually).</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 21:04:29 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/iostream/outcome_print.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/iostream.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/policy.html b/doc/html/reference/functions/policy.html
new file mode 100644
index 000000000..2ce265de8
--- /dev/null
+++ b/doc/html/reference/functions/policy.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Policy - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/iostream/result_print.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/policy/basic_outcome_failure_exception_from_error.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Policy</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../../reference/functions/policy/basic_outcome_failure_exception_from_error.html" ><code>auto basic_outcome_failure_exception_from_error(const EC &amp;)</code></a>
+<p>ADL discovered free function synthesising an exception type from an error type, used by the <code>.failure()</code> observers.</p><li>
+	<a href="../../reference/functions/policy/error_code.html" ><code>decltype(auto) error_code(T &amp;&amp;)</code></a>
+<p>Extracts a <code>boost::system::error_code</code> or <code>std::error_code</code> from the input via ADL discovery of a suitable <code>make_error_code(T)</code> function.</p><li>
+	<a href="../../reference/functions/policy/exception_ptr.html" ><code>decltype(auto) exception_ptr(T &amp;&amp;)</code></a>
+<p>Extracts a <code>boost::exception_ptr</code> or <code>std::exception_ptr</code> from the input via ADL discovery of a suitable <code>make_exception_ptr(T)</code> function.</p><li>
+	<a href="../../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_enum.html" ><code>void outcome_throw_as_system_error_with_payload(BoostErrorCodeEnum &amp;&amp;)</code></a>
+<p>Specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for input types where <code>boost::system::is_error_code_enum&lt;BoostErrorCodeEnum&gt;</code> or <code>boost::system::is_error_condition_enum&lt;BoostErrorCodeEnum&gt;</code> is true.</p><li>
+	<a href="../../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_enum.html" ><code>void outcome_throw_as_system_error_with_payload(ErrorCodeEnum &amp;&amp;)</code></a>
+<p>Specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for input types where <code>std::is_error_code_enum&lt;ErrorCodeEnum&gt;</code> or <code>std::is_error_condition_enum&lt;ErrorCodeEnum&gt;</code> is true.</p><li>
+	<a href="../../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_error_code.html" ><code>void outcome_throw_as_system_error_with_payload(const boost::system::error_code &amp;)</code></a>
+<p>Specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for <code>boost::system::error_code</code>.</p><li>
+	<a href="../../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_error_code.html" ><code>void outcome_throw_as_system_error_with_payload(const std::error_code &amp;)</code></a>
+<p>Specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for <code>std::error_code</code>.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/iostream/result_print.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/policy/basic_outcome_failure_exception_from_error.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/policy/basic_outcome_failure_exception_from_error.html b/doc/html/reference/functions/policy/basic_outcome_failure_exception_from_error.html
new file mode 100644
index 000000000..c6d7403a4
--- /dev/null
+++ b/doc/html/reference/functions/policy/basic_outcome_failure_exception_from_error.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>auto basic_outcome_failure_exception_from_error(const EC &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/error_code.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>auto basic_outcome_failure_exception_from_error(const EC &amp;)</code></h1></div></div></div>
+  <p>Synthesises an exception type from an error type, used by the <a href="../../../reference/types/basic_outcome/failure.html" class="api-reference"><code>exception_type failure() const noexcept</code></a>
+
+observers. ADL discovered. Default
+overloads for this function are defined in Outcome for 
+<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code</code></a>
+
+and <code>boost::system::error_code</code>, these return <code>std::make_exception_ptr(std::system_error(ec))</code>
+and <code>boost::copy_exception(boost::system::system_error(ec))</code> respectively.</p>
+
+<p><em>Overridable</em>: Argument dependent lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: Namespace of <code>EC</code> type.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/std_outcome.hpp&gt;</code>, <code>&lt;boost/outcome/boost_outcome.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 06, 2019 at 16:50:01 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/error_code.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/policy/error_code.html b/doc/html/reference/functions/policy/error_code.html
new file mode 100644
index 000000000..dcb9159e7
--- /dev/null
+++ b/doc/html/reference/functions/policy/error_code.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>decltype(auto) error_code(T &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/basic_outcome_failure_exception_from_error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/exception_ptr.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>decltype(auto) error_code(T &amp;&amp;)</code></h1></div></div></div>
+  <p>Extracts a <code>boost::system::error_code</code> or 
+<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code</code></a>
+ from the input via ADL discovery of a suitable <code>make_error_code(T)</code> function.</p>
+
+<p><em>Overridable</em>: Argument dependent lookup.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 11, 2019 at 15:13:33 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/basic_outcome_failure_exception_from_error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/exception_ptr.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/policy/exception_ptr.html b/doc/html/reference/functions/policy/exception_ptr.html
new file mode 100644
index 000000000..7c87e1d36
--- /dev/null
+++ b/doc/html/reference/functions/policy/exception_ptr.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>decltype(auto) exception_ptr(T &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/error_code.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_enum.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>decltype(auto) exception_ptr(T &amp;&amp;)</code></h1></div></div></div>
+  <p>Extracts a <code>boost::exception_ptr</code> or 
+<a href="https://en.cppreference.com/w/cpp/error/exception_ptr" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::exception_ptr</code></a>
+ from the input via ADL discovery of a suitable <code>make_exception_ptr(T)</code> function.</p>
+
+<p><em>Overridable</em>: Argument dependent lookup.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 23, 2019 at 01:27:31 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/error_code.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_enum.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_enum.html b/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_enum.html
new file mode 100644
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+++ b/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_enum.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void outcome_throw_as_system_error_with_payload(BoostErrorCodeEnum &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/exception_ptr.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_enum.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void outcome_throw_as_system_error_with_payload(BoostErrorCodeEnum &amp;&amp;)</code></h1></div></div></div>
+  <p>A specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for types where <code>boost::system::is_error_code_enum&lt;BoostErrorCodeEnum&gt;</code> or <code>boost::system::is_error_condition_enum&lt;BoostErrorCodeEnum&gt;</code> is true. This executes <a href="../../../reference/macros/throw_exception.html" class="api-reference"><code>BOOST_OUTCOME_THROW_EXCEPTION(expr)</code></a>
+ with a <code>boost::system::system_error</code> constructed from the result of the ADL discovered free function <code>make_error_code(BoostErrorCodeEnum)</code>.</p>
+
+<p><em>Overridable</em>: Argument dependent lookup.</p>
+
+<p><em>Requires</em>: Either <code>boost::system::is_error_code_enum&lt;T&gt;</code> or <code>boost::system::is_error_condition_enum&lt;T&gt;</code> to be true for a decayed <code>BoostErrorCodeEnum</code>.</p>
+
+<p><em>Namespace</em>: <code>boost::system</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/boost_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: August 13, 2019 at 13:55:04 -0400</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/exception_ptr.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_enum.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_error_code.html b/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_error_code.html
new file mode 100644
index 000000000..c5a930a28
--- /dev/null
+++ b/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_error_code.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void outcome_throw_as_system_error_with_payload(const boost::system::error_code &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_enum.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_error_code.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void outcome_throw_as_system_error_with_payload(const boost::system::error_code &amp;)</code></h1></div></div></div>
+  <p>A specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for <code>boost::system::error_code</code>. This executes <a href="../../../reference/macros/throw_exception.html" class="api-reference"><code>BOOST_OUTCOME_THROW_EXCEPTION(expr)</code></a>
+ with a <code>boost::system::system_error</code> constructed from the input.</p>
+
+<p><em>Overridable</em>: Argument dependent lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>boost::system</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/boost_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_enum.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_std_error_code.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_std_enum.html b/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_std_enum.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_std_enum.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void outcome_throw_as_system_error_with_payload(ErrorCodeEnum &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_enum.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_error_code.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void outcome_throw_as_system_error_with_payload(ErrorCodeEnum &amp;&amp;)</code></h1></div></div></div>
+  <p>A specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for types where <code>std::is_error_code_enum&lt;ErrorCodeEnum&gt;</code> or <code>std::is_error_condition_enum&lt;ErrorCodeEnum&gt;</code> is true. This executes <a href="../../../reference/macros/throw_exception.html" class="api-reference"><code>BOOST_OUTCOME_THROW_EXCEPTION(expr)</code></a>
+ with a 
+<a href="https://en.cppreference.com/w/cpp/error/system_error" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::system_error</code></a>
+ constructed from the result of the ADL discovered free function <code>make_error_code(ErrorCodeEnum)</code>.</p>
+
+<p><em>Overridable</em>: Argument dependent lookup.</p>
+
+<p><em>Requires</em>: Either 
+<a href="https://en.cppreference.com/w/cpp/error/error_code/is_error_code_enum" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::is_error_code_enum&lt;T&gt;</code></a>
+ or 
+<a href="https://en.cppreference.com/w/cpp/error/error_condition/is_error_condition_enum" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::is_error_condition_enum&lt;T&gt;</code></a>
+ to be true for a decayed <code>ErrorCodeEnum</code>.</p>
+
+<p><em>Namespace</em>: <code>std</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 15:52:57 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_enum.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_error_code.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_std_error_code.html b/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_std_error_code.html
new file mode 100644
index 000000000..96c3ceaf5
--- /dev/null
+++ b/doc/html/reference/functions/policy/outcome_throw_as_system_error_with_payload_std_error_code.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void outcome_throw_as_system_error_with_payload(const std::error_code &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_error_code.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/failure.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void outcome_throw_as_system_error_with_payload(const std::error_code &amp;)</code></h1></div></div></div>
+  <p>A specialisation of <code>outcome_throw_as_system_error_with_payload()</code> for <code>std::error_code</code>. This executes <a href="../../../reference/macros/throw_exception.html" class="api-reference"><code>BOOST_OUTCOME_THROW_EXCEPTION(expr)</code></a>
+ with a 
+<a href="https://en.cppreference.com/w/cpp/error/system_error" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::system_error</code></a>
+ constructed from the input.</p>
+
+<p><em>Overridable</em>: Argument dependent lookup.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>std</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 15:52:57 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_error_code.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/functions/policy.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/functions/failure.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/strong_swap.html b/doc/html/reference/functions/strong_swap.html
new file mode 100644
index 000000000..cdbc5b5bf
--- /dev/null
+++ b/doc/html/reference/functions/strong_swap.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void strong_swap(bool &amp;all_good, T &amp;a, T &amp;b) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/error_from_exception.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/try_throw_std_exception_from_error.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void strong_swap(bool &amp;all_good, T &amp;a, T &amp;b)</code></h1></div></div></div>
+  <p>The standard <code>swap()</code> function provides the weak guarantee i.e. that no resources are lost. This ADL discovered function provides the strong guarantee instead: that if any of these operations throw an exception (i) move construct to temporary (ii) move assign <code>b</code> to <code>a</code> (iii) move assign temporary to <code>b</code>, an attempt is made to restore the exact pre-swapped state upon entry, and if that recovery too fails, then the boolean <code>all_good</code> will be false during stack unwind from the exception throw, to indicate that state has been lost.</p>
+
+<p>This function is used within <code>basic_result::</code><a href="../../reference/types/basic_result/swap.html" class="api-reference"><code>swap(basic_result &amp;)</code></a>
+ if, and only if, either or both of <code>value_type</code> or <code>error_type</code> have a throwing move constructor or move assignment. It permits you to customise the implementation of the strong guarantee swap in Outcome with a more efficient implementation.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup (ADL).</p>
+
+<p><em>Requires</em>: That <code>T</code> is both move constructible and move assignable.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: June 24, 2019 at 21:09:37 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/error_from_exception.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/try_throw_std_exception_from_error.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/success.html b/doc/html/reference/functions/success.html
new file mode 100644
index 000000000..d2e3b5eaf
--- /dev/null
+++ b/doc/html/reference/functions/success.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>auto success(T &amp;&amp;, &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/failure.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/try_operation_has_value.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>auto success(T &amp;&amp;, ...)</code></h1></div></div></div>
+  <p>Returns appropriate type sugar for constructing a successful result or outcome, usually <a href="../../reference/types/success_type.html" class="api-reference"><code>success_type&lt;T&gt;</code></a>
+ with a decayed <code>T</code>.</p>
+
+<p>Two default overloads are provided, one taking a single required parameter with optional spare storage value parameter returning <code>success_type&lt;std::decay_t&lt;T&gt;&gt;</code> and perfectly forwarding the input. The other overload takes no parameters, and returns <code>success_type&lt;void&gt;</code>, which usually causes the construction of the receiving <code>basic_result</code> or <code>basic_outcome</code>&rsquo;s with a default construction of their value type.</p>
+
+<p><em>Overridable</em>: By Argument Dependent Lookup (ADL).</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/success_failure.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 23, 2021 at 17:37:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/failure.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/try_operation_has_value.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/try_operation_extract_value.html b/doc/html/reference/functions/try_operation_extract_value.html
new file mode 100644
index 000000000..847cb705b
--- /dev/null
+++ b/doc/html/reference/functions/try_operation_extract_value.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>decltype(auto) try_operation_extract_value(X) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/try_operation_has_value.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/try_operation_return_as.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>decltype(auto) try_operation_extract_value(X)</code></h1></div></div></div>
+  <p>This default implementation returns whatever the <code>.assume_value()</code> or <code>.value()</code> member functions return, preferentially choosing the former where both are available.</p>
+
+<p><em>Requires</em>: That the expression <code>std::declval&lt;T&gt;().assume_value()</code> and/or <code>std::declval&lt;T&gt;().value()</code> is a valid expression.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: June 20, 2019 at 11:14:48 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/try_operation_has_value.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/try_operation_return_as.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/try_operation_has_value.html b/doc/html/reference/functions/try_operation_has_value.html
new file mode 100644
index 000000000..6bb53d746
--- /dev/null
+++ b/doc/html/reference/functions/try_operation_has_value.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool try_operation_has_value(X) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/success.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool try_operation_has_value(X)</code></h1></div></div></div>
+  <p>This default implementation returns whatever the <code>.has_value()</code> member function returns.</p>
+
+<p><em>Requires</em>: That the expression <code>std::declval&lt;T&gt;().has_value()</code> is a valid expression.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: June 20, 2019 at 11:14:48 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/success.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/functions/try_operation_return_as.html b/doc/html/reference/functions/try_operation_return_as.html
new file mode 100644
index 000000000..476df7d07
--- /dev/null
+++ b/doc/html/reference/functions/try_operation_return_as.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>decltype(auto) try_operation_return_as(X) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/try_operation_extract_value.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/error_from_exception.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>decltype(auto) try_operation_return_as(X)</code></h1></div></div></div>
+  <p>This default implementation preferentially returns whatever the input type&rsquo;s <code>.as_failure()</code> member function returns.
+<code>basic_result</code> and <code>basic_outcome</code> provide such a member function, see <a href="../../reference/types/basic_result/as_failure_lvalue.html" class="api-reference"><code>auto as_failure() const &amp;</code></a>
+.</p>
+
+<p>If <code>.as_failure()</code> is not available, it will also match any <code>.error()</code> member function, which it wraps into a failure type sugar using <a href="../../reference/functions/failure.html" class="api-reference"><code>failure(T &amp;&amp;, ...)</code></a>
+.</p>
+
+<p><em>Requires</em>: That the expression <code>std::declval&lt;T&gt;().as_failure()</code> and/or <code>std::declval&lt;T&gt;().error()</code> is a valid expression.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: June 20, 2019 at 11:14:48 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/try_operation_extract_value.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/functions/error_from_exception.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/functions/try_throw_std_exception_from_error.html b/doc/html/reference/functions/try_throw_std_exception_from_error.html
new file mode 100644
index 000000000..6951a2b7c
--- /dev/null
+++ b/doc/html/reference/functions/try_throw_std_exception_from_error.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void try_throw_std_exception_from_error(std::error_code ec, const std::string &amp;msg = std::string{}) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/strong_swap.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../faq.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void try_throw_std_exception_from_error(std::error_code ec, const std::string &amp;msg = std::string{})</code></h1></div></div></div>
+  <p>This function saves writing boilerplate by throwing a standard library exception
+type equivalent to the supplied error code, with an optional custom message.</p>
+
+<p>If the function returns, there is no standard library exception type equivalent
+to the supplied error code. The following codes produce the following exception
+throws:</p>
+
+<dl>
+<dt><code>EINVAL</code>
+<dd><code>std::invalid_argument</code>
+<dt><code>EDOM</code>
+<dd><code>std::domain_error</code>
+<dt><code>E2BIG</code>
+<dd><code>std::length_error</code>
+<dt><code>ERANGE</code>
+<dd><code>std::out_of_range</code>
+<dt><code>EOVERFLOW</code>
+<dd><code>std::overflow_error</code>
+<dt><code>ENOMEM</code>
+<dd><code>std::bad_alloc</code>
+</dl>
+
+<p>The choice to refer to POSIX <code>errno</code> values above reflects the matching algorithm.
+As 
+<a href="https://en.cppreference.com/w/cpp/error/errc" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::errc</code></a>
+ exactly maps POSIX <code>errno</code>, on all platforms
+
+<a href="https://en.cppreference.com/w/cpp/error/generic_category" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::generic_category</code></a>
+ error codes are matched by this function.
+Only on POSIX platforms only are 
+<a href="https://en.cppreference.com/w/cpp/error/system_category" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::system_category</code></a>
+ error codes
+also matched by this function.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Requires</em>: C++ exceptions to be globally enabled.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/utils.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 23:42:52 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/functions/strong_swap.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/functions.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../faq.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros.html b/doc/html/reference/macros.html
new file mode 100644
index 000000000..067383542
--- /dev/null
+++ b/doc/html/reference/macros.html
@@ -0,0 +1,82 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Macros - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../reference.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/macros/template.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Macros</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../reference/macros/template.html" >Constrained template macros</a><li>
+	<a href="../reference/macros/version.html" >Version macros</a><li>
+	<a href="../reference/macros/co_try.html" ><code>BOOST_OUTCOME_CO_TRY(var, expr)</code></a>
+<p>Evaluate within a coroutine an expression which results in an understood type, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/co_tryv.html" ><code>BOOST_OUTCOME_CO_TRYV(expr)/BOOST_OUTCOME_CO_TRY(expr)</code></a>
+<p>Evaluate from within a coroutine an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/co_tryv2.html" ><code>BOOST_OUTCOME_CO_TRYV2(spec, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/co_tryv2_failure_likely.html" ><code>BOOST_OUTCOME_CO_TRYV2_FAILURE_LIKELY(spec, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/co_tryv_failure_likely.html" ><code>BOOST_OUTCOME_CO_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(expr)</code></a>
+<p>Evaluate from within a coroutine an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/co_tryx.html" ><code>BOOST_OUTCOME_CO_TRYX(expr)</code></a>
+<p>Evaluate from within a coroutine an expression which results in an understood type, emitting the <code>T</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/co_tryx_failure_likely.html" ><code>BOOST_OUTCOME_CO_TRYX_FAILURE_LIKELY(expr)</code></a>
+<p>Evaluate from within a coroutine an expression which results in an understood type, emitting the <code>T</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/co_try_failure_likely.html" ><code>BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(var, expr)</code></a>
+<p>Evaluate within a coroutine an expression which results in an understood type, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/disable_execinfo.html" ><code>BOOST_OUTCOME_DISABLE_EXECINFO</code></a>
+<p>If defined, disables the use of the <code>&lt;execinfo.h&gt;</code> header (or the win32 emulation).</p><li>
+	<a href="../reference/macros/enable_legacy_support_for.html" ><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+<p>Enables backwards features and naming compatibility for earlier versions of Outcome.</p><li>
+	<a href="../reference/macros/nodiscard.html" ><code>BOOST_OUTCOME_NODISCARD</code></a>
+<p>How to tell the compiler than the return value of a function should not be discarded without examining it.</p><li>
+	<a href="../reference/macros/requires.html" ><code>BOOST_OUTCOME_REQUIRES(...)</code></a>
+<p>A C++ 20 <code>requires(...)</code>, if available.</p><li>
+	<a href="../reference/macros/symbol_visible.html" ><code>BOOST_OUTCOME_SYMBOL_VISIBLE</code></a>
+<p>How to mark throwable types as always having default ELF symbol visibility.</p><li>
+	<a href="../reference/macros/thread_local.html" ><code>BOOST_OUTCOME_THREAD_LOCAL</code></a>
+<p>How to mark variables as having thread local storage duration.</p><li>
+	<a href="../reference/macros/throw_exception.html" ><code>BOOST_OUTCOME_THROW_EXCEPTION(expr)</code></a>
+<p>How to throw a C++ exception, or equivalent thereof.</p><li>
+	<a href="../reference/macros/try.html" ><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/tryv.html" ><code>BOOST_OUTCOME_TRYV(expr)/BOOST_OUTCOME_TRY(expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/tryv2.html" ><code>BOOST_OUTCOME_TRYV2(spec, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/tryv2_failure_likely.html" ><code>BOOST_OUTCOME_TRYV2_FAILURE_LIKELY(spec, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/tryv_failure_likely.html" ><code>BOOST_OUTCOME_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_TRY_FAILURE_LIKELY(expr)</code></a>
+<p>Evaluate an expression which results in an understood type, continuing execution if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/tryx.html" ><code>BOOST_OUTCOME_TRYX(expr)</code></a>
+<p>Evaluate an expression which results in an understood type, emitting the <code>T</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/tryx_failure_likely.html" ><code>BOOST_OUTCOME_TRYX_FAILURE_LIKELY(expr)</code></a>
+<p>Evaluate an expression which results in an understood type, emitting the <code>T</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/try_failure_likely.html" ><code>BOOST_OUTCOME_TRY_FAILURE_LIKELY(var, expr)</code></a>
+<p>Evaluate an expression which results in an understood type, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <code>try_operation_return_as(X)</code> from the calling function if unsuccessful.</p><li>
+	<a href="../reference/macros/in_place_type.html" ><code>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE</code></a>
+<p>How to implement <code>in_place_type_t&lt;T&gt;</code> and <code>in_place_type&lt;T&gt;</code>.</p><li>
+	<a href="../reference/macros/is_nothrow_swappable.html" ><code>BOOST_OUTCOME_USE_STD_IS_NOTHROW_SWAPPABLE</code></a>
+<p>How to implement <code>is_nothrow_swappable&lt;T&gt;</code>.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 10, 2018 at 20:32:00 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../reference.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/macros/template.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/co_try.html b/doc/html/reference/macros/co_try.html
new file mode 100644
index 000000000..d7b61a5f4
--- /dev/null
+++ b/doc/html/reference/macros/co_try.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_CO_TRY(var, expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/version.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryv.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_CO_TRY(var, expr)</code></h1></div></div></div>
+  <p>Evaluate within a coroutine an expression which results in a type matching the following customisation points, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be successful. If you expect failure, you should use <a href="../../reference/macros/co_try_failure_likely.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(var, expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: See <a href="../../reference/macros/co_tryv.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYV(expr)</code></a>
+ for most of the mechanics.</p>
+
+<p>If successful, <code>var</code> is initialised or assigned to the expression result&rsquo;s <code>.assume_value()</code> if available, else to its <code>.value()</code>. This binds a reference possibly to the <code>T</code> stored inside the bound result of the expression, but possibly also to a temporary emitted from the value observer function.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+<p><em>Legacy</em>: Before Outcome v2.2, <code>var</code> was always declared as an automatic rvalue ref. You can use the backwards compatibility macro <code>OUTCOME21_CO_TRY()</code> if wish to retain the old behaviour.</p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/version.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryv.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/co_try_failure_likely.html b/doc/html/reference/macros/co_try_failure_likely.html
new file mode 100644
index 000000000..5160e6585
--- /dev/null
+++ b/doc/html/reference/macros/co_try_failure_likely.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(var, expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryx_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/disable_execinfo.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(var, expr)</code></h1></div></div></div>
+  <p>Evaluate within a coroutine an expression which results in a type matching the following customisation points, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be unsuccessful. If you expect success, you should use <a href="../../reference/macros/co_try.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRY(var, expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: See <a href="../../reference/macros/co_tryv.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYV(expr)</code></a>
+ for most of the mechanics.</p>
+
+<p>If successful, <code>var</code> is initialised or assigned to the expression result&rsquo;s <code>.assume_value()</code> if available, else to its <code>.value()</code>. This binds a reference possibly to the <code>T</code> stored inside the bound result of the expression, but possibly also to a temporary emitted from the value observer function.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+<p><em>Legacy</em>: Before Outcome v2.2, <code>var</code> was always declared as an automatic rvalue ref. You can use the backwards compatibility macro <code>OUTCOME21_CO_TRY()</code> if wish to retain the old behaviour.</p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryx_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/disable_execinfo.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/co_tryv.html b/doc/html/reference/macros/co_tryv.html
new file mode 100644
index 000000000..66ed86c42
--- /dev/null
+++ b/doc/html/reference/macros/co_tryv.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_CO_TRYV(expr)/BOOST_OUTCOME_CO_TRY(expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_try.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryv2.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_CO_TRYV(expr)/BOOST_OUTCOME_CO_TRY(expr)</code></h1></div></div></div>
+  <p>Evaluate from within a coroutine an expression which results in a type matching the following customisation points, continuing execution if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>The difference between the <code>BOOST_OUTCOME_CO_TRYV(expr)</code> and <code>BOOST_OUTCOME_CO_TRY(expr)</code> editions is that the latter will set a variable if two or more macro arguments are present (see <a href="../../reference/macros/co_try.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRY(var, expr)</code></a>
+). The former requires the <code>T</code> to be <code>void</code>.</p>
+
+<p>Hints are given to the compiler that the expression will be successful. If you expect failure, you should use <a href="../../reference/macros/co_tryv_failure_likely.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYV_FAILURE_LIKELY(expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: Firstly the expression&rsquo;s temporary is bound to a uniquely named, stack allocated, <code>auto &amp;&amp;</code>. If that reference&rsquo;s bound object&rsquo;s <code>try_operation_has_value()</code> is false, immediately execute <code>return try_operation_return_as(propagated unique reference);</code>, propagating the rvalue/lvalue/etc-ness of the original expression.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_try.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryv2.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/co_tryv2.html b/doc/html/reference/macros/co_tryv2.html
new file mode 100644
index 000000000..c1610938b
--- /dev/null
+++ b/doc/html/reference/macros/co_tryv2.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_CO_TRYV2(spec, expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryv.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryv2_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_CO_TRYV2(spec, expr)</code></h1></div></div></div>
+  <p>Evaluate an expression which results in a type matching the following customisation points, continuing execution if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be successful. If you expect failure, you should use <a href="../../reference/macros/tryv2_failure_likely.html" class="api-reference"><code>BOOST_OUTCOME_TRYV2_FAILURE_LIKELY(spec, expr)</code></a>
+ instead.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: Firstly the expression&rsquo;s temporary is bound to a uniquely named, stack allocated, <code>spec</code>. If that reference&rsquo;s bound object&rsquo;s <code>try_operation_has_value()</code> is false, immediately execute <code>return try_operation_return_as(propagated unique reference);</code>, propagating the rvalue/lvalue/etc-ness of the original expression.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryv.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryv2_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/co_tryv2_failure_likely.html b/doc/html/reference/macros/co_tryv2_failure_likely.html
new file mode 100644
index 000000000..7aa67d8ea
--- /dev/null
+++ b/doc/html/reference/macros/co_tryv2_failure_likely.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_CO_TRYV2_FAILURE_LIKELY(spec, expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryv2.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryv_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_CO_TRYV2_FAILURE_LIKELY(spec, expr)</code></h1></div></div></div>
+  <p>Evaluate an expression which results in a type matching the following customisation points, continuing execution if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be unsuccessful. If you expect success, you should use <a href="../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)</code></a>
+ instead.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: Firstly the expression&rsquo;s temporary is bound to a uniquely named, stack allocated, <code>spec</code>. If that reference&rsquo;s bound object&rsquo;s <code>try_operation_has_value()</code> is false, immediately execute <code>return try_operation_return_as(propagated unique reference);</code>, propagating the rvalue/lvalue/etc-ness of the original expression.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryv2.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryv_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/co_tryv_failure_likely.html b/doc/html/reference/macros/co_tryv_failure_likely.html
new file mode 100644
index 000000000..e9d892b6a
--- /dev/null
+++ b/doc/html/reference/macros/co_tryv_failure_likely.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_CO_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryv2_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryx.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_CO_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_CO_TRY_FAILURE_LIKELY(expr)</code></h1></div></div></div>
+  <p>Evaluate from within a coroutine an expression which results in a type matching the following customisation points, continuing execution if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>The difference between the <code>BOOST_OUTCOME_CO_TRYV(expr)</code> and <code>BOOST_OUTCOME_CO_TRY(expr)</code> editions is that the latter will set a variable if two or more macro arguments are present (see <a href="../../reference/macros/co_try.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRY(var, expr)</code></a>
+). The former requires the <code>T</code> to be <code>void</code>.</p>
+
+<p>Hints are given to the compiler that the expression will be unsuccessful. If you expect success, you should use <a href="../../reference/macros/co_tryv.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYV(expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: Firstly the expression&rsquo;s temporary is bound to a uniquely named, stack allocated, <code>auto &amp;&amp;</code>. If that reference&rsquo;s bound object&rsquo;s <code>try_operation_has_value()</code> is false, immediately execute <code>return try_operation_return_as(propagated unique reference);</code>, propagating the rvalue/lvalue/etc-ness of the original expression.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryv2_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryx.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/co_tryx.html b/doc/html/reference/macros/co_tryx.html
new file mode 100644
index 000000000..6ffaf93c5
--- /dev/null
+++ b/doc/html/reference/macros/co_tryx.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_CO_TRYX(expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryv_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_tryx_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_CO_TRYX(expr)</code></h1></div></div></div>
+  <p>Evaluate within a coroutine an expression which results in a type matching the following customisation points, emitting the <code>T</code> if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be successful. If you expect failure, you should use <a href="../../reference/macros/co_tryx_failure_likely.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYX_FAILURE_LIKELY(expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Availability</em>: GCC and clang only. Use <code>#ifdef BOOST_OUTCOME_CO_TRYX</code> to determine if available.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: See <a href="../../reference/macros/co_tryv.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYV(expr)</code></a>
+ for most of the mechanics.</p>
+
+<p>This macro makes use of a proprietary extension in GCC and clang to emit the <code>T</code> from a successful expression. You can thus use <code>BOOST_OUTCOME_CO_TRYX(expr)</code> directly in expressions e.g. <code>auto x = y + BOOST_OUTCOME_CO_TRYX(foo(z));</code>.</p>
+
+<p>Be aware there are compiler quirks in preserving the rvalue/lvalue/etc-ness of emitted <code>T</code>&rsquo;s, specifically copy or move constructors may be called unexpectedly and/or copy elision not work as expected. If these prove to be problematic, use <a href="../../reference/macros/co_try.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRY(var, expr)</code></a>
+ instead.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryv_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/macros/co_tryx_failure_likely.html b/doc/html/reference/macros/co_tryx_failure_likely.html
new file mode 100644
index 000000000..886bf969f
--- /dev/null
+++ b/doc/html/reference/macros/co_tryx_failure_likely.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_CO_TRYX_FAILURE_LIKELY(expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryx.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_try_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_CO_TRYX_FAILURE_LIKELY(expr)</code></h1></div></div></div>
+  <p>Evaluate within a coroutine an expression which results in a type matching the following customisation points, emitting the <code>T</code> if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be unsuccessful. If you expect success, you should use <a href="../../reference/macros/co_tryx.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYX(expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Availability</em>: GCC and clang only. Use <code>#ifdef BOOST_OUTCOME_CO_TRYX</code> to determine if available.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: See <a href="../../reference/macros/co_tryv.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYV(expr)</code></a>
+ for most of the mechanics.</p>
+
+<p>This macro makes use of a proprietary extension in GCC and clang to emit the <code>T</code> from a successful expression. You can thus use <code>BOOST_OUTCOME_CO_TRYX(expr)</code> directly in expressions e.g. <code>auto x = y + BOOST_OUTCOME_CO_TRYX(foo(z));</code>.</p>
+
+<p>Be aware there are compiler quirks in preserving the rvalue/lvalue/etc-ness of emitted <code>T</code>&rsquo;s, specifically copy or move constructors may be called unexpectedly and/or copy elision not work as expected. If these prove to be problematic, use <a href="../../reference/macros/co_try.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRY(var, expr)</code></a>
+ instead.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_tryx.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_try_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/disable_execinfo.html b/doc/html/reference/macros/disable_execinfo.html
new file mode 100644
index 000000000..8c58bc63a
--- /dev/null
+++ b/doc/html/reference/macros/disable_execinfo.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_DISABLE_EXECINFO - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_try_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/enable_legacy_support_for.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_DISABLE_EXECINFO</code></h1></div></div></div>
+  <p>If defined, disables the use of the <code>&lt;execinfo.h&gt;</code> header (or the win32 emulation).</p>
+
+<p>Some embedded Linux toolchains do not define <code>&lt;execinfo.h&gt;</code>, thus disabling C++ exceptions on those toolchains produces a failure to find this file. Avoid that problem by defining this macro to disable stack backtrace support entirely.</p>
+
+<p><em>Overridable</em>: Define before inclusion.</p>
+
+<p><em>Default</em>: Defined if <code>__ANDROID__</code> is defined, else undefined.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: December 12, 2018 at 22:01:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/co_try_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/enable_legacy_support_for.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/enable_legacy_support_for.html b/doc/html/reference/macros/enable_legacy_support_for.html
new file mode 100644
index 000000000..4ba279cdf
--- /dev/null
+++ b/doc/html/reference/macros/enable_legacy_support_for.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/disable_execinfo.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/nodiscard.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></h1></div></div></div>
+  <p>As Outcome has evolved, some features and especially naming were retired in newer versions. Define this macro to enable backwards compatibility aliasing from old features and naming to new features and naming.</p>
+
+<p><em>Overridable</em>: Define before inclusion.</p>
+
+<p><em>Default</em>: The current version of Outcome, expressed in hundreds e.g. Outcome v2.10 is <code>210</code>.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: May 24, 2020 at 12:48:39 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/disable_execinfo.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/macros/in_place_type.html b/doc/html/reference/macros/in_place_type.html
new file mode 100644
index 000000000..ae3410c2e
--- /dev/null
+++ b/doc/html/reference/macros/in_place_type.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/try_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/is_nothrow_swappable.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE</code></h1></div></div></div>
+  <p>How to implement <a href="../../reference/types/in_place_type_t.html" class="api-reference"><code>in_place_type_t&lt;T&gt;</code></a>
+ and <code>in_place_type&lt;T&gt;</code>.</p>
+
+<p>If set to <code>1</code>, the <code>&lt;utility&gt;</code> header is included, and <code>std::in_place_type_t&lt;T&gt;</code>
+is aliased into <code>BOOST_OUTCOME_V2_NAMESPACE::in_place_type_t&lt;T&gt;</code> along with
+<code>std::in_place_type&lt;T&gt;</code>.</p>
+
+<p>If set to <code>0</code>, a local emulation is used.</p>
+
+<p><em>Overridable</em>: Define before inclusion.</p>
+
+<p><em>Default</em>: If the current compiler implements C++ 17 or later, if unset
+this macro is defaulted to <code>1</code>, otherwise it is defaulted to <code>0</code>.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 30, 2019 at 16:16:10 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/try_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/is_nothrow_swappable.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/is_nothrow_swappable.html b/doc/html/reference/macros/is_nothrow_swappable.html
new file mode 100644
index 000000000..da7d6dd95
--- /dev/null
+++ b/doc/html/reference/macros/is_nothrow_swappable.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_USE_STD_IS_NOTHROW_SWAPPABLE - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/in_place_type.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/concepts.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_USE_STD_IS_NOTHROW_SWAPPABLE</code></h1></div></div></div>
+  <p>Whether to implement <code>is_nothrow_swappable&lt;T&gt;</code> as <code>std::is_nothrow_swappable&lt;T&gt;</code>,
+or else use a local emulation.</p>
+
+<p><em>Overridable</em>: Define before inclusion.</p>
+
+<p><em>Default</em>: If the current compiler implements C++ 17 or later, if unset
+this macro is defaulted to <code>1</code>, otherwise it is defaulted to <code>0</code>.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 05, 2019 at 17:14:18 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/in_place_type.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/concepts.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/nodiscard.html b/doc/html/reference/macros/nodiscard.html
new file mode 100644
index 000000000..3d343c257
--- /dev/null
+++ b/doc/html/reference/macros/nodiscard.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_NODISCARD - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/enable_legacy_support_for.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/requires.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_NODISCARD</code></h1></div></div></div>
+  <p>Compiler-specific markup used to tell the compiler than the return value of a function should not be discarded without examining it.</p>
+
+<p><em>Overridable</em>: Define before inclusion.</p>
+
+<p><em>Default</em>: To <code>[[nodiscard]]</code> if on C++ 17 or higher, <code>__attribute__((warn_unused_result))</code> if on clang, SAL <code>_Must_inspect_result_</code> if on MSVC, otherwise nothing.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: December 12, 2018 at 22:01:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/enable_legacy_support_for.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/requires.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/requires.html b/doc/html/reference/macros/requires.html
new file mode 100644
index 000000000..7ccfc51a4
--- /dev/null
+++ b/doc/html/reference/macros/requires.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_REQUIRES(&hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/nodiscard.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/symbol_visible.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_REQUIRES(...)</code></h1></div></div></div>
+  <p>A C++ 20 <code>requires(...)</code>, if available.</p>
+
+<p><em>Overridable</em>: Define before inclusion.</p>
+
+<p><em>Default</em>: To <code>requires(...)</code> if on C++ 20 or later, else to nothing.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: December 12, 2018 at 22:01:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/nodiscard.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/symbol_visible.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/symbol_visible.html b/doc/html/reference/macros/symbol_visible.html
new file mode 100644
index 000000000..8ddc724c4
--- /dev/null
+++ b/doc/html/reference/macros/symbol_visible.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_SYMBOL_VISIBLE - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/requires.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/thread_local.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_SYMBOL_VISIBLE</code></h1></div></div></div>
+  <p>Compiler-specific markup used to mark throwable types as always having default ELF symbol visibility, without which it will be impossible to catch throws of such types across shared library boundaries on ELF only.</p>
+
+<p><em>Overridable</em>: Define before inclusion.</p>
+
+<p><em>Default</em>:<dl>
+<dt>Standalone Outcome:
+<dd>To <code>__attribute__((visibility(&quot;default&quot;))</code> on GCC and clang when targeting ELF, otherwise nothing.
+<dt>Boost.Outcome:
+<dd>To <code>BOOST_SYMBOL_VISIBLE</code>.
+</dl></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: December 12, 2018 at 22:01:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/requires.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/thread_local.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/template.html b/doc/html/reference/macros/template.html
new file mode 100644
index 000000000..be0a95bad
--- /dev/null
+++ b/doc/html/reference/macros/template.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Constrained template macros - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/version.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Constrained template macros</h1></div></div></div>
+  <p><em>Overridable</em>: All of the following macros are overridable, define before inclusion.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+<p>These macros expand into either the syntax for directly specifying constrained templates in C++ 20, or into a SFINAE based emulation for earlier C++ versions. Form of usage looks as follows:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_TEMPLATE</span><span class="p">(</span><span class="k">class</span><span class="err"> </span><span class="nc">ErrorCondEnum</span><span class="p">)</span>
+  <span class="n">BOOST_OUTCOME_TREQUIRES</span><span class="p">(</span>
+    <span class="c1">// If this is a valid expression
+</span><span class="c1"></span>    <span class="n">BOOST_OUTCOME_TEXPR</span><span class="p">(</span><span class="n">error_type</span><span class="p">(</span><span class="n">make_error_code</span><span class="p">(</span><span class="n">ErrorCondEnum</span><span class="p">()))),</span>
+    <span class="c1">// If this predicate is true
+</span><span class="c1"></span>    <span class="n">BOOST_OUTCOME_TPRED</span><span class="p">(</span><span class="n">predicate</span><span class="o">::</span><span class="k">template</span> <span class="n">enable_error_condition_converting_constructor</span><span class="o">&lt;</span><span class="n">ErrorCondEnum</span><span class="o">&gt;</span><span class="p">)</span>
+    <span class="c1">// Any additional requirements follow here ...
+</span><span class="c1"></span>  <span class="p">)</span>
+  <span class="k">constexpr</span> <span class="n">basic_result</span><span class="p">(</span><span class="n">ErrorCondEnum</span> <span class="o">&amp;&amp;</span><span class="n">t</span><span class="p">,</span> <span class="n">error_condition_converting_constructor_tag</span> <span class="cm">/*unused*/</span> <span class="o">=</span> <span class="p">{});</span>
+</code></pre></div>
+<p>Be aware that slightly different semantics occur for real C++ 20 constrained templates than for the SFINAE emulation.</p>
+
+<ul>
+<li><p><a name="template"></a><code>BOOST_OUTCOME_TEMPLATE(template args ...)</code></p>
+
+<p>Begins a constrained template declaration.</p></li>
+
+<li><p><a name="trequires"></a><code>BOOST_OUTCOME_TREQUIRES(requirements ...)</code></p>
+
+<p>Specifies the requirements for the constrained template to be available for selection by the compiler.</p></li>
+
+<li><p><a name="texpr"></a><code>BOOST_OUTCOME_TEXPR(expression)</code></p>
+
+<p>A requirement that the given expression is valid.</p></li>
+
+<li><p><a name="tpred"></a><code>BOOST_OUTCOME_TPRED(boolean)</code></p>
+
+<p>A requirement that the given constant time expression is true.</p></li>
+</ul>
+
+
+        </div><p><small>Last revised: December 12, 2018 at 22:01:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/version.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/thread_local.html b/doc/html/reference/macros/thread_local.html
new file mode 100644
index 000000000..d557ab7f9
--- /dev/null
+++ b/doc/html/reference/macros/thread_local.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_THREAD_LOCAL - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/symbol_visible.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/throw_exception.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_THREAD_LOCAL</code></h1></div></div></div>
+  <p>Compiler-specific markup used to mark variables as having thread local storage duration.</p>
+
+<div class="notices note" style="background: url('../../images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>This isn&rsquo;t used inside Outcome, but is used by its unit test suite.</p>
+</div>
+</div>
+
+
+<p><em>Overridable</em>: Define before inclusion.</p>
+
+<p><em>Default</em>: To <code>thread_local</code> if the compiler implements C++ 11 <code>thread_local</code>, else <code>__thread</code> for the one supported compiler (older Mac OS XCode) which does not.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: December 12, 2018 at 22:01:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/symbol_visible.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/throw_exception.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/throw_exception.html b/doc/html/reference/macros/throw_exception.html
new file mode 100644
index 000000000..bde025a61
--- /dev/null
+++ b/doc/html/reference/macros/throw_exception.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_THROW_EXCEPTION(expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/thread_local.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_THROW_EXCEPTION(expr)</code></h1></div></div></div>
+  <p>Throws a C++ exception, or equivalent thereof.</p>
+
+<p><em>Overridable</em>: Define before inclusion.</p>
+
+<p><em>Default</em>:<dl>
+<dt>Standalone Outcome (C++ exceptions enabled):
+<dd>To <code>throw expr</code>
+<dt>Standalone Outcome (C++ exceptions disabled):
+<dd>To <code>BOOST_OUTCOME_V2_NAMESPACE::detail::do_fatal_exit(#expr)</code> which is a function which prints a useful error message including a stack backtrace (where available) to <code>stderr</code> before calling <code>abort()</code>.
+<dt>Boost.Outcome:
+<dd>To <code>BOOST_THROW_EXCEPTION(expr)</code>.
+</dl></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: December 12, 2018 at 22:01:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/thread_local.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/try.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/try.html b/doc/html/reference/macros/try.html
new file mode 100644
index 000000000..80a1b6745
--- /dev/null
+++ b/doc/html/reference/macros/try.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_TRY(var, expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/throw_exception.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryv.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_TRY(var, expr)</code></h1></div></div></div>
+  <p>Evaluate an expression which results in a type matching the following customisation points, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be successful. If you expect failure, you should use <a href="../../reference/macros/try_failure_likely.html" class="api-reference"><code>BOOST_OUTCOME_TRY_FAILURE_LIKELY(var, expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: See <a href="../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)</code></a>
+ for most of the mechanics.</p>
+
+<p>If successful, <code>var</code> is initialised or assigned to the expression result&rsquo;s <code>.assume_value()</code> if available, else to its <code>.value()</code>. This binds a reference possibly to the <code>T</code> stored inside the bound result of the expression, but possibly also to a temporary emitted from the value observer function.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+<p><em>Legacy</em>: Before Outcome v2.2, <code>var</code> was always declared as an automatic rvalue ref. You can use the backwards compatibility macro <code>OUTCOME21_TRY()</code> if wish to retain the old behaviour.</p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/throw_exception.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryv.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/try_failure_likely.html b/doc/html/reference/macros/try_failure_likely.html
new file mode 100644
index 000000000..0528a47c2
--- /dev/null
+++ b/doc/html/reference/macros/try_failure_likely.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_TRY_FAILURE_LIKELY(var, expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryx_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/in_place_type.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_TRY_FAILURE_LIKELY(var, expr)</code></h1></div></div></div>
+  <p>Evaluate an expression which results in a type matching the following customisation points, assigning <code>T</code> to a decl called <code>var</code> if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be unsuccessful. If you expect success, you should use <a href="../../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: See <a href="../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)</code></a>
+ for most of the mechanics.</p>
+
+<p>If successful, <code>var</code> is initialised or assigned to the expression result&rsquo;s <code>.assume_value()</code> if available, else to its <code>.value()</code>. This binds a reference possibly to the <code>T</code> stored inside the bound result of the expression, but possibly also to a temporary emitted from the value observer function.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+<p><em>Legacy</em>: Before Outcome v2.2, <code>var</code> was always declared as an automatic rvalue ref. You can use the backwards compatibility macro <code>OUTCOME21_CO_TRY()</code> if wish to retain the old behaviour.</p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryx_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/in_place_type.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/tryv.html b/doc/html/reference/macros/tryv.html
new file mode 100644
index 000000000..7d83a6560
--- /dev/null
+++ b/doc/html/reference/macros/tryv.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_TRYV(expr)/BOOST_OUTCOME_TRY(expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/try.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryv2.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_TRYV(expr)/BOOST_OUTCOME_TRY(expr)</code></h1></div></div></div>
+  <p>Evaluate an expression which results in a type matching the following customisation points, continuing execution if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>The difference between the <code>BOOST_OUTCOME_TRYV(expr)</code> and <code>BOOST_OUTCOME_TRY(expr)</code> editions is that the latter will set a variable if two or more macro arguments are present (see <a href="../../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+). The former requires the <code>T</code> to be <code>void</code>.</p>
+
+<p>Hints are given to the compiler that the expression will be successful. If you expect failure, you should use <a href="../../reference/macros/tryv_failure_likely.html" class="api-reference"><code>BOOST_OUTCOME_TRYV_FAILURE_LIKELY(expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: Firstly the expression&rsquo;s temporary is bound to a uniquely named, stack allocated, <code>auto &amp;&amp;</code>. If that reference&rsquo;s bound object&rsquo;s <code>try_operation_has_value()</code> is false, immediately execute <code>return try_operation_return_as(propagated unique reference);</code>, propagating the rvalue/lvalue/etc-ness of the original expression.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/try.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryv2.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/tryv2.html b/doc/html/reference/macros/tryv2.html
new file mode 100644
index 000000000..17b434269
--- /dev/null
+++ b/doc/html/reference/macros/tryv2.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_TRYV2(spec, expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryv.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryv2_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_TRYV2(spec, expr)</code></h1></div></div></div>
+  <p>Evaluate an expression which results in a type matching the following customisation points, continuing execution if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be successful. If you expect failure, you should use <a href="../../reference/macros/tryv2_failure_likely.html" class="api-reference"><code>BOOST_OUTCOME_TRYV2_FAILURE_LIKELY(spec, expr)</code></a>
+ instead.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: Firstly the expression&rsquo;s temporary is bound to a uniquely named, stack allocated, <code>spec</code>. If that reference&rsquo;s bound object&rsquo;s <code>try_operation_has_value()</code> is false, immediately execute <code>return try_operation_return_as(propagated unique reference);</code>, propagating the rvalue/lvalue/etc-ness of the original expression.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryv.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryv2_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/tryv2_failure_likely.html b/doc/html/reference/macros/tryv2_failure_likely.html
new file mode 100644
index 000000000..1b89d0f78
--- /dev/null
+++ b/doc/html/reference/macros/tryv2_failure_likely.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_TRYV2_FAILURE_LIKELY(spec, expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryv2.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryv_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_TRYV2_FAILURE_LIKELY(spec, expr)</code></h1></div></div></div>
+  <p>Evaluate an expression which results in a type matching the following customisation points, continuing execution if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be unsuccessful. If you expect success, you should use <a href="../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)</code></a>
+ instead.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: Firstly the expression&rsquo;s temporary is bound to a uniquely named, stack allocated, <code>spec</code>. If that reference&rsquo;s bound object&rsquo;s <code>try_operation_has_value()</code> is false, immediately execute <code>return try_operation_return_as(propagated unique reference);</code>, propagating the rvalue/lvalue/etc-ness of the original expression.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryv2.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryv_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/tryv_failure_likely.html b/doc/html/reference/macros/tryv_failure_likely.html
new file mode 100644
index 000000000..db19cbee2
--- /dev/null
+++ b/doc/html/reference/macros/tryv_failure_likely.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_TRY_FAILURE_LIKELY(expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryv2_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryx.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_TRYV_FAILURE_LIKELY(expr)/BOOST_OUTCOME_TRY_FAILURE_LIKELY(expr)</code></h1></div></div></div>
+  <p>Evaluate an expression which results in a type matching the following customisation points, continuing execution if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>The difference between the <code>BOOST_OUTCOME_TRYV(expr)</code> and <code>BOOST_OUTCOME_TRY(expr)</code> editions is that the latter will set a variable if two or more macro arguments are present (see <a href="../../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+). The former requires the <code>T</code> to be <code>void</code>.</p>
+
+<p>Hints are given to the compiler that the expression will be unsuccessful. If you expect success, you should use <a href="../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: Firstly the expression&rsquo;s temporary is bound to a uniquely named, stack allocated, <code>auto &amp;&amp;</code>. If that reference&rsquo;s bound object&rsquo;s <code>try_operation_has_value()</code> is false, immediately execute <code>return try_operation_return_as(propagated unique reference);</code>, propagating the rvalue/lvalue/etc-ness of the original expression.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryv2_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryx.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/tryx.html b/doc/html/reference/macros/tryx.html
new file mode 100644
index 000000000..3423de5f3
--- /dev/null
+++ b/doc/html/reference/macros/tryx.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_TRYX(expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryv_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryx_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_TRYX(expr)</code></h1></div></div></div>
+  <p>Evaluate an expression which results in a type matching the following customisation points, emitting the <code>T</code> if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be successful. If you expect failure, you should use <a href="../../reference/macros/tryx_failure_likely.html" class="api-reference"><code>BOOST_OUTCOME_TRYX_FAILURE_LIKELY(expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Availability</em>: GCC and clang only. Use <code>#ifdef BOOST_OUTCOME_TRYX</code> to determine if available.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: See <a href="../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)</code></a>
+ for most of the mechanics.</p>
+
+<p>This macro makes use of a proprietary extension in GCC and clang to emit the <code>T</code> from a successful expression. You can thus use <code>BOOST_OUTCOME_TRYX(expr)</code> directly in expressions e.g. <code>auto x = y + BOOST_OUTCOME_TRYX(foo(z));</code>.</p>
+
+<p>Be aware there are compiler quirks in preserving the rvalue/lvalue/etc-ness of emitted <code>T</code>&rsquo;s, specifically copy or move constructors may be called unexpectedly and/or copy elision not work as expected. If these prove to be problematic, use <a href="../../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+ instead.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryv_failure_likely.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/tryx_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/tryx_failure_likely.html b/doc/html/reference/macros/tryx_failure_likely.html
new file mode 100644
index 000000000..91e8cf8f0
--- /dev/null
+++ b/doc/html/reference/macros/tryx_failure_likely.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>BOOST_OUTCOME_TRYX_FAILURE_LIKELY(expr) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryx.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/try_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_TRYX_FAILURE_LIKELY(expr)</code></h1></div></div></div>
+  <p>Evaluate an expression which results in a type matching the following customisation points, emitting the <code>T</code> if successful, immediately returning <a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+ from the calling function if unsuccessful:</p>
+
+<ul>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_has_value.html" class="api-reference"><code>try_operation_has_value(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_return_as.html" class="api-reference"><code>try_operation_return_as(X)</code></a>
+</li>
+<li><code>BOOST_OUTCOME_V2_NAMESPACE::</code><a href="../../reference/functions/try_operation_extract_value.html" class="api-reference"><code>try_operation_extract_value(X)</code></a>
+</li>
+</ul>
+
+<p>Default overloads for these customisation points are provided. See <a href="../../recipes/foreign-try.html">the recipe for supporting foreign input to <code>BOOST_OUTCOME_TRY</code></a>.</p>
+
+<p>Hints are given to the compiler that the expression will be unsuccessful. If you expect success, you should use <a href="../../reference/macros/tryx.html" class="api-reference"><code>BOOST_OUTCOME_TRYX(expr)</code></a>
+ instead.</p>
+
+<p>An internal temporary to hold the value of the expression is created, which generally invokes a copy/move. <a href="../../tutorial/essential/result/try_ref.html">If you wish to never copy/move, you can tell this macro to create the internal temporary as a reference instead.</a></p>
+
+<p><em>Availability</em>: GCC and clang only. Use <code>#ifdef BOOST_OUTCOME_TRYX</code> to determine if available.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: See <a href="../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)</code></a>
+ for most of the mechanics.</p>
+
+<p>This macro makes use of a proprietary extension in GCC and clang to emit the <code>T</code> from a successful expression. You can thus use <code>BOOST_OUTCOME_TRYX(expr)</code> directly in expressions e.g. <code>auto x = y + BOOST_OUTCOME_TRYX(foo(z));</code>.</p>
+
+<p>Be aware there are compiler quirks in preserving the rvalue/lvalue/etc-ness of emitted <code>T</code>&rsquo;s, specifically copy or move constructors may be called unexpectedly and/or copy elision not work as expected. If these prove to be problematic, use <a href="../../reference/macros/try.html" class="api-reference"><code>BOOST_OUTCOME_TRY(var, expr)</code></a>
+ instead.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/try.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/tryx.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/try_failure_likely.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/macros/version.html b/doc/html/reference/macros/version.html
new file mode 100644
index 000000000..cff9537a7
--- /dev/null
+++ b/doc/html/reference/macros/version.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Version macros - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/template.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_try.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Version macros</h1></div></div></div>
+  <p><em>Overridable</em>: None of the following macros are overridable.</p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+<ul>
+<li><p><a name="version-major"></a><code>BOOST_OUTCOME_VERSION_MAJOR &lt;number&gt;</code></p>
+
+<p>Major version for cmake and DLL version stamping.</p></li>
+
+<li><p><a name="version-minor"></a><code>BOOST_OUTCOME_VERSION_MINOR &lt;number&gt;</code></p>
+
+<p>Minor version for cmake and DLL version stamping.</p></li>
+
+<li><p><a name="version-patch"></a><code>BOOST_OUTCOME_VERSION_PATCH &lt;number&gt;</code></p>
+
+<p>Patch version for cmake and DLL version stamping.</p></li>
+
+<li><p><a name="version-revision"></a><code>BOOST_OUTCOME_VERSION_REVISION &lt;number&gt;</code></p>
+
+<p>Revision version for cmake and DLL version stamping.</p></li>
+
+<li><p><a name="unstable-version"></a><code>BOOST_OUTCOME_UNSTABLE_VERSION &lt;number&gt;</code></p>
+
+<p>Defined between stable releases of Outcome. It means the inline namespace will be permuted per-commit to ensure ABI uniqueness such that multiple versions of Outcome in a single process space cannot collide.</p></li>
+
+<li><p><a name="v2"></a><code>BOOST_OUTCOME_V2 &lt;tokens&gt;</code></p>
+
+<p>The namespace configuration of this Outcome v2. Consists of a sequence of bracketed tokens later fused by the preprocessor into namespace and C++ module names.</p></li>
+
+<li><p><a name="v2-namespace"></a><code>BOOST_OUTCOME_V2_NAMESPACE &lt;identifier&gt;</code></p>
+
+<p>The Outcome namespace, which may be permuted per SHA commit. This is not fully qualified.</p></li>
+
+<li><p><a name="v2-namespace-begin"></a><code>BOOST_OUTCOME_V2_NAMESPACE_BEGIN &lt;keywords and identifiers&gt;</code></p>
+
+<p>Expands into the appropriate namespace markup to enter the Outcome v2 namespace.</p></li>
+
+<li><p><a name="v2-namespace-export-begin"></a><code>BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN &lt;keywords and identifiers&gt;</code></p>
+
+<p>Expands into the appropriate namespace markup to enter the C++ module exported Outcome v2 namespace.</p></li>
+
+<li><p><a name="v2-namespace-end"></a><code>BOOST_OUTCOME_V2_NAMESPACE_END &lt;keywords and identifiers&gt;</code></p>
+
+<p>Expands into the appropriate namespace markup to exit the Outcome v2 namespace.</p></li>
+</ul>
+
+
+        </div><p><small>Last revised: December 12, 2018 at 22:01:42 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/macros/template.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/macros.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/macros/co_try.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies.html b/doc/html/reference/policies.html
new file mode 100644
index 000000000..9977a58f8
--- /dev/null
+++ b/doc/html/reference/policies.html
@@ -0,0 +1,100 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Policies - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../reference/traits/type_can_be_used_in_basic_result.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/policies/base.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Policies</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../reference/policies/base.html" ><code>base</code></a>
+<p>Base class of most policy classes defining the narrow observer policies.</p><ol><li>
+	<a href="../reference/policies/base/ub.html" ><code>static void _ub(Impl &amp;&amp;)</code></a>
+<p>Special function which causes noticeable hard undefined behaviour.</p><li>
+	<a href="../reference/policies/base/has_value.html" ><code>static bool _has_value(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns true if a value is present in the implementation passed in. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/has_error.html" ><code>static bool _has_error(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns true if an error is present in the implementation passed in. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/has_exception.html" ><code>static bool _has_exception(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns true if an exception is present in the implementation passed in. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/has_error_is_errno.html" ><code>static bool _has_error_is_errno(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns true if the error code in the implementation passed in has a domain or category matching that of POSIX <code>errno</code>. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/value.html" ><code>static auto &amp;&amp;_value(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns a reference to the value in the implementation passed in. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/error.html" ><code>static auto &amp;&amp;_error(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns a reference to the error in the implementation passed in. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/exception.html" ><code>static auto &amp;&amp;_exception(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns a reference to the exception in the implementation passed in. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/set_has_value.html" ><code>static void _set_has_value(Impl &amp;&amp;, bool) noexcept</code></a>
+<p>Sets whether the implementation has a value. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/set_has_error.html" ><code>static void _set_has_error(Impl &amp;&amp;, bool) noexcept</code></a>
+<p>Sets whether the implementation has an error. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/set_has_exception.html" ><code>static void _set_has_exception(Impl &amp;&amp;, bool) noexcept</code></a>
+<p>Sets whether the implementation has an exception. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/set_has_error_is_errno.html" ><code>static void _set_has_exception(Impl &amp;&amp;, bool) noexcept</code></a>
+<p>Sets whether the implementation&rsquo;s error code has a domain or category matching that of POSIX <code>errno</code>. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/narrow_value_check.html" ><code>static void narrow_value_check(Impl &amp;&amp;) noexcept</code></a>
+<p>Observer policy performing hard UB if no value is present. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/narrow_error_check.html" ><code>static void narrow_error_check(Impl &amp;&amp;) noexcept</code></a>
+<p>Observer policy performing hard UB if no error is present. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/narrow_exception_check.html" ><code>static void narrow_exception_check(Impl &amp;&amp;) noexcept</code></a>
+<p>Observer policy performing hard UB if no exception is present. Constexpr, never throws.</p><li>
+	<a href="../reference/policies/base/on_outcome_construction.html" ><code>static void on_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the implicit constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/policies/base/on_outcome_construction2.html" ><code>static void on_outcome_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the implicit constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/policies/base/on_outcome_copy_construction.html" ><code>static void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting copy constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/policies/base/on_outcome_copy_construction2.html" ><code>static void on_outcome_copy_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting copy constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/policies/base/on_outcome_in_place_construction.html" ><code>static void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the in-place constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/policies/base/on_outcome_move_construction.html" ><code>static void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting move constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/policies/base/on_outcome_move_construction2.html" ><code>static void on_outcome_move_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting move constructors of <code>basic_outcome</code>.</p><li>
+	<a href="../reference/policies/base/on_result_construction.html" ><code>static void on_result_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the implicit constructors of <code>basic_result</code>.</p><li>
+	<a href="../reference/policies/base/on_result_copy_construction.html" ><code>static void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting copy constructors of <code>basic_result</code>.</p><li>
+	<a href="../reference/policies/base/on_result_in_place_construction.html" ><code>static void on_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the in-place constructors of <code>basic_result</code>.</p><li>
+	<a href="../reference/policies/base/on_result_move_construction.html" ><code>static void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting move constructors of <code>basic_result</code>.</p></li></ol><li>
+	<a href="../reference/policies/all_narrow.html" ><code>all_narrow</code></a>
+<p>Policy class defining that hard undefined behaviour should occur on incorrect narrow and wide value, error or exception observation. Inherits publicly from <code>base</code>.</p><li>
+	<a href="../reference/policies/error_code_throw_as_system_error_outcome.html" ><code>error_code_throw_as_system_error&lt;T, EC, EP&gt;</code></a>
+<p>Policy class defining that <code>EP</code> ought to be rethrown if possible, then the ADL discovered free function <code>outcome_throw_as_system_error_with_payload()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_outcome</code>.</p><li>
+	<a href="../reference/policies/error_code_throw_as_system_error_result.html" ><code>error_code_throw_as_system_error&lt;T, EC, void&gt;</code></a>
+<p>Policy class defining that the ADL discovered free function <code>outcome_throw_as_system_error_with_payload()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_result</code>.</p><li>
+	<a href="../reference/policies/exception_ptr_rethrow_outcome.html" ><code>exception_ptr_rethrow&lt;T, EC, EP&gt;</code></a>
+<p>Policy class defining that the ADL discovered free function <code>rethrow_exception()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_outcome</code>.</p><li>
+	<a href="../reference/policies/exception_ptr_rethrow_result.html" ><code>exception_ptr_rethrow&lt;T, EC, void&gt;</code></a>
+<p>Policy class defining that the ADL discovered free function <code>rethrow_exception()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_result</code>.</p><li>
+	<a href="../reference/policies/fail_to_compile_observers.html" ><code>fail_to_compile_observers</code></a>
+<p>Policy class defining that a static assertion should occur upon compilation of the wide value, error or exception observation. Inherits publicly from <code>base</code>.</p><li>
+	<a href="../reference/policies/terminate.html" ><code>terminate</code></a>
+<p>Policy class defining that <code>std::terminate()</code> should be called on incorrect wide value, error or exception observation. Inherits publicly from <code>base</code>.</p><li>
+	<a href="../reference/policies/throw_bad_result_access.html" ><code>throw_bad_result_access&lt;EC&gt;</code></a>
+<p>Policy class defining that <code>bad_result_access_with&lt;EC&gt;</code> should be thrown on incorrect wide value observation. Inherits publicly from <code>base</code>.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 13, 2018 at 21:10:19 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../reference/traits/type_can_be_used_in_basic_result.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/policies/base.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/all_narrow.html b/doc/html/reference/policies/all_narrow.html
new file mode 100644
index 000000000..d08232299
--- /dev/null
+++ b/doc/html/reference/policies/all_narrow.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>all_narrow - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/base/on_result_move_construction.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/error_code_throw_as_system_error_outcome.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>all_narrow</code></h1></div></div></div>
+  <p>Policy class defining that hard undefined behaviour should occur on incorrect narrow and wide value, error or exception observation.</p>
+
+<p>Inherits publicly from <a href="../../reference/policies/base.html" class="api-reference"><code>base</code></a>
+, and simply defines its wide value, error and exception observer policies to call their corresponding narrow editions.</p>
+
+<p>Included by <code>&lt;basic_result.hpp&gt;</code>, and so is always available when <code>basic_result</code> is available.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/policy/all_narrow.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/base/on_result_move_construction.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/error_code_throw_as_system_error_outcome.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base.html b/doc/html/reference/policies/base.html
new file mode 100644
index 000000000..f9d31b50f
--- /dev/null
+++ b/doc/html/reference/policies/base.html
@@ -0,0 +1,107 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>base - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/base/ub.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>base</code></h1></div></div></div>
+
+
+<p>Implements the base class of most policy classes defining the narrow observer policies.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/policy/base.hpp&gt;</code></p>
+
+<h3 id="protected-member-functions">Protected member functions</h3>
+
+<h4 id="special">Special</h4>
+
+<ol class="children children-li"><li>
+	<a href="../../reference/policies/base/ub.html" ><code>static void _ub(Impl &amp;&amp;)</code></a>
+<p>Special function which causes noticeable hard undefined behaviour.</p></li></ol>
+
+<h4 id="observers">Observers</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/policies/base/has_value.html" ><code>static bool _has_value(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns true if a value is present in the implementation passed in. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/has_error.html" ><code>static bool _has_error(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns true if an error is present in the implementation passed in. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/has_exception.html" ><code>static bool _has_exception(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns true if an exception is present in the implementation passed in. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/has_error_is_errno.html" ><code>static bool _has_error_is_errno(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns true if the error code in the implementation passed in has a domain or category matching that of POSIX <code>errno</code>. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/value.html" ><code>static auto &amp;&amp;_value(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns a reference to the value in the implementation passed in. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/error.html" ><code>static auto &amp;&amp;_error(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns a reference to the error in the implementation passed in. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/exception.html" ><code>static auto &amp;&amp;_exception(Impl &amp;&amp;) noexcept</code></a>
+<p>Returns a reference to the exception in the implementation passed in. Constexpr, never throws.</p></li></ol>
+
+<h4 id="modifiers">Modifiers</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/policies/base/set_has_value.html" ><code>static void _set_has_value(Impl &amp;&amp;, bool) noexcept</code></a>
+<p>Sets whether the implementation has a value. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/set_has_error.html" ><code>static void _set_has_error(Impl &amp;&amp;, bool) noexcept</code></a>
+<p>Sets whether the implementation has an error. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/set_has_exception.html" ><code>static void _set_has_exception(Impl &amp;&amp;, bool) noexcept</code></a>
+<p>Sets whether the implementation has an exception. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/set_has_error_is_errno.html" ><code>static void _set_has_exception(Impl &amp;&amp;, bool) noexcept</code></a>
+<p>Sets whether the implementation&rsquo;s error code has a domain or category matching that of POSIX <code>errno</code>. Constexpr, never throws.</p></li></ol>
+
+<h3 id="public-member-functions">Public member functions</h3>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/policies/base/narrow_value_check.html" ><code>static void narrow_value_check(Impl &amp;&amp;) noexcept</code></a>
+<p>Observer policy performing hard UB if no value is present. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/narrow_error_check.html" ><code>static void narrow_error_check(Impl &amp;&amp;) noexcept</code></a>
+<p>Observer policy performing hard UB if no error is present. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/narrow_exception_check.html" ><code>static void narrow_exception_check(Impl &amp;&amp;) noexcept</code></a>
+<p>Observer policy performing hard UB if no exception is present. Constexpr, never throws.</p><li>
+    <a href="../../reference/policies/base/on_outcome_construction.html" ><code>static void on_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the implicit constructors of <code>basic_outcome</code>.</p><li>
+    <a href="../../reference/policies/base/on_outcome_construction2.html" ><code>static void on_outcome_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the implicit constructors of <code>basic_outcome</code>.</p><li>
+    <a href="../../reference/policies/base/on_outcome_copy_construction.html" ><code>static void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting copy constructors of <code>basic_outcome</code>.</p><li>
+    <a href="../../reference/policies/base/on_outcome_copy_construction2.html" ><code>static void on_outcome_copy_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting copy constructors of <code>basic_outcome</code>.</p><li>
+    <a href="../../reference/policies/base/on_outcome_in_place_construction.html" ><code>static void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the in-place constructors of <code>basic_outcome</code>.</p><li>
+    <a href="../../reference/policies/base/on_outcome_move_construction.html" ><code>static void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting move constructors of <code>basic_outcome</code>.</p><li>
+    <a href="../../reference/policies/base/on_outcome_move_construction2.html" ><code>static void on_outcome_move_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting move constructors of <code>basic_outcome</code>.</p><li>
+    <a href="../../reference/policies/base/on_result_construction.html" ><code>static void on_result_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the implicit constructors of <code>basic_result</code>.</p><li>
+    <a href="../../reference/policies/base/on_result_copy_construction.html" ><code>static void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting copy constructors of <code>basic_result</code>.</p><li>
+    <a href="../../reference/policies/base/on_result_in_place_construction.html" ><code>static void on_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the in-place constructors of <code>basic_result</code>.</p><li>
+    <a href="../../reference/policies/base/on_result_move_construction.html" ><code>static void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+<p>(&gt;= Outcome v2.2.0) Hook invoked by the converting move constructors of <code>basic_result</code>.</p></li></ol>
+
+
+
+
+
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/policies/base/error.html b/doc/html/reference/policies/base/error.html
new file mode 100644
index 000000000..f04aba833
--- /dev/null
+++ b/doc/html/reference/policies/base/error.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static auto &amp;&amp;_error(Impl &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/exception.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static auto &amp;&amp;_error(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Returns a reference to the error in the implementation passed in. No checking is done to ensure there is an error. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/exception.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/exception.html b/doc/html/reference/policies/base/exception.html
new file mode 100644
index 000000000..02472554c
--- /dev/null
+++ b/doc/html/reference/policies/base/exception.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static auto &amp;&amp;_exception(Impl &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/set_has_value.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static auto &amp;&amp;_exception(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Returns a reference to the exception in the implementation passed in. No checking is done to ensure there is an error. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/set_has_value.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/has_error.html b/doc/html/reference/policies/base/has_error.html
new file mode 100644
index 000000000..d3fd2cd63
--- /dev/null
+++ b/doc/html/reference/policies/base/has_error.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static bool _has_error(Impl &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/has_value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/has_exception.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static bool _has_error(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Returns true if an error is present in the implementation passed in. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/has_value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/has_exception.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/has_error_is_errno.html b/doc/html/reference/policies/base/has_error_is_errno.html
new file mode 100644
index 000000000..83cb735f9
--- /dev/null
+++ b/doc/html/reference/policies/base/has_error_is_errno.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static bool _has_error_is_errno(Impl &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/has_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/value.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static bool _has_error_is_errno(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Returns true if the error code in the implementation passed in has a domain or category matching that of POSIX <code>errno</code>. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/has_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/value.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/has_exception.html b/doc/html/reference/policies/base/has_exception.html
new file mode 100644
index 000000000..a64045f2f
--- /dev/null
+++ b/doc/html/reference/policies/base/has_exception.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static bool _has_exception(Impl &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/has_error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/has_error_is_errno.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static bool _has_exception(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Returns true if an exception is present in the implementation passed in. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/has_error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/has_error_is_errno.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/has_value.html b/doc/html/reference/policies/base/has_value.html
new file mode 100644
index 000000000..9f5790012
--- /dev/null
+++ b/doc/html/reference/policies/base/has_value.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static bool _has_value(Impl &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/ub.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/has_error.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static bool _has_value(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Returns true if a value is present in the implementation passed in. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/ub.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/has_error.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/narrow_error_check.html b/doc/html/reference/policies/base/narrow_error_check.html
new file mode 100644
index 000000000..f274ad7d7
--- /dev/null
+++ b/doc/html/reference/policies/base/narrow_error_check.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void narrow_error_check(Impl &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/narrow_value_check.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/narrow_exception_check.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void narrow_error_check(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Observer policy performing hard UB if no error is present, by calling <a href="../../../reference/policies/base/ub.html" class="api-reference"><code>static void _ub(Impl &amp;&amp;)</code></a>
+. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/narrow_value_check.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/narrow_exception_check.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/narrow_exception_check.html b/doc/html/reference/policies/base/narrow_exception_check.html
new file mode 100644
index 000000000..9cc4ce484
--- /dev/null
+++ b/doc/html/reference/policies/base/narrow_exception_check.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void narrow_exception_check(Impl &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/narrow_error_check.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void narrow_exception_check(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Observer policy performing hard UB if no exception is present, by calling <a href="../../../reference/policies/base/ub.html" class="api-reference"><code>static void _ub(Impl &amp;&amp;)</code></a>
+. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/narrow_error_check.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/narrow_value_check.html b/doc/html/reference/policies/base/narrow_value_check.html
new file mode 100644
index 000000000..fb2ba7611
--- /dev/null
+++ b/doc/html/reference/policies/base/narrow_value_check.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void narrow_value_check(Impl &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/set_has_error_is_errno.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/narrow_error_check.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void narrow_value_check(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Observer policy performing hard UB if no value is present, by calling <a href="../../../reference/policies/base/ub.html" class="api-reference"><code>static void _ub(Impl &amp;&amp;)</code></a>
+. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/set_has_error_is_errno.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/narrow_error_check.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_outcome_construction.html b/doc/html/reference/policies/base/on_outcome_construction.html
new file mode 100644
index 000000000..b8c2a70fe
--- /dev/null
+++ b/doc/html/reference/policies/base/on_outcome_construction.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_outcome_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/narrow_exception_check.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_outcome_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the implicit constructors of <code>basic_outcome</code>. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/narrow_exception_check.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_outcome_construction2.html b/doc/html/reference/policies/base/on_outcome_construction2.html
new file mode 100644
index 000000000..9d779f066
--- /dev/null
+++ b/doc/html/reference/policies/base/on_outcome_construction2.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_outcome_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_copy_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_outcome_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the implicit constructors of <code>basic_outcome</code> which consume two arguments. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_copy_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_outcome_copy_construction.html b/doc/html/reference/policies/base/on_outcome_copy_construction.html
new file mode 100644
index 000000000..5e0423f82
--- /dev/null
+++ b/doc/html/reference/policies/base/on_outcome_copy_construction.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_copy_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting copy constructors of <code>basic_outcome</code> (NOT the standard copy constructor). See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_copy_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_outcome_copy_construction2.html b/doc/html/reference/policies/base/on_outcome_copy_construction2.html
new file mode 100644
index 000000000..2e9daedb4
--- /dev/null
+++ b/doc/html/reference/policies/base/on_outcome_copy_construction2.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_outcome_copy_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_copy_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_in_place_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_outcome_copy_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting copy constructors of <code>basic_outcome</code> (NOT the standard copy constructor) which consume two arguments. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_copy_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_in_place_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_outcome_in_place_construction.html b/doc/html/reference/policies/base/on_outcome_in_place_construction.html
new file mode 100644
index 000000000..62838060c
--- /dev/null
+++ b/doc/html/reference/policies/base/on_outcome_in_place_construction.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;&hellip;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_copy_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_move_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the in-place constructors of <code>basic_outcome</code>. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_copy_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_move_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_outcome_move_construction.html b/doc/html/reference/policies/base/on_outcome_move_construction.html
new file mode 100644
index 000000000..b5022e0a1
--- /dev/null
+++ b/doc/html/reference/policies/base/on_outcome_move_construction.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_outcome_move_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_in_place_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_move_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting move constructors of <code>basic_outcome</code> (NOT the standard move constructor). See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_in_place_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_outcome_move_construction2.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_outcome_move_construction2.html b/doc/html/reference/policies/base/on_outcome_move_construction2.html
new file mode 100644
index 000000000..465dc7ede
--- /dev/null
+++ b/doc/html/reference/policies/base/on_outcome_move_construction2.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_outcome_move_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_move_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_result_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_outcome_move_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting move constructors of <code>basic_outcome</code> (NOT the standard move constructor) which consume two arguments. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_move_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_result_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_result_construction.html b/doc/html/reference/policies/base/on_result_construction.html
new file mode 100644
index 000000000..27e1731a0
--- /dev/null
+++ b/doc/html/reference/policies/base/on_result_construction.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_result_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_move_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_result_copy_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_result_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, generally invoked by the implicit constructors of <code>basic_result</code>. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_outcome_move_construction2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_result_copy_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_result_copy_construction.html b/doc/html/reference/policies/base/on_result_copy_construction.html
new file mode 100644
index 000000000..d6975a6c8
--- /dev/null
+++ b/doc/html/reference/policies/base/on_result_copy_construction.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_result_copy_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_result_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_result_in_place_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting copy constructors of <code>basic_result</code> (NOT the standard copy constructor). See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_result_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_result_in_place_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_result_in_place_construction.html b/doc/html/reference/policies/base/on_result_in_place_construction.html
new file mode 100644
index 000000000..662095b65
--- /dev/null
+++ b/doc/html/reference/policies/base/on_result_in_place_construction.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;&hellip;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_result_copy_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_result_move_construction.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, generally invoked by the in-place constructors of <code>basic_result</code>. See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_result_copy_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/on_result_move_construction.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/on_result_move_construction.html b/doc/html/reference/policies/base/on_result_move_construction.html
new file mode 100644
index 000000000..67d96e873
--- /dev/null
+++ b/doc/html/reference/policies/base/on_result_move_construction.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void on_result_move_construction(T *, U &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_result_in_place_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/all_narrow.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>One of the constructor hooks for <a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+, generally invoked by the converting move constructors of <code>basic_result</code> (NOT the standard move constructor). See each constructor&rsquo;s documentation to see which specific hook it invokes.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/on_result_in_place_construction.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/all_narrow.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/set_has_error.html b/doc/html/reference/policies/base/set_has_error.html
new file mode 100644
index 000000000..9da9ff4f4
--- /dev/null
+++ b/doc/html/reference/policies/base/set_has_error.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void _set_has_error(Impl &amp;&amp;, bool) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/set_has_value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/set_has_exception.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void _set_has_error(Impl &amp;&amp;, bool) noexcept</code></h1></div></div></div>
+  <p>Sets whether the implementation has an error by setting or clearing the relevant bit in the flags. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/set_has_value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/set_has_exception.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/set_has_error_is_errno.html b/doc/html/reference/policies/base/set_has_error_is_errno.html
new file mode 100644
index 000000000..a9bbac9e5
--- /dev/null
+++ b/doc/html/reference/policies/base/set_has_error_is_errno.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void _set_has_exception(Impl &amp;&amp;, bool) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/set_has_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/narrow_value_check.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void _set_has_exception(Impl &amp;&amp;, bool) noexcept</code></h1></div></div></div>
+  <p>Sets whether the implementation&rsquo;s error code has a domain or category matching that of POSIX <code>errno</code> by setting or clearing the relevant bit in the flags. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/set_has_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/narrow_value_check.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/set_has_exception.html b/doc/html/reference/policies/base/set_has_exception.html
new file mode 100644
index 000000000..b11334928
--- /dev/null
+++ b/doc/html/reference/policies/base/set_has_exception.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void _set_has_exception(Impl &amp;&amp;, bool) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/set_has_error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/set_has_error_is_errno.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void _set_has_exception(Impl &amp;&amp;, bool) noexcept</code></h1></div></div></div>
+  <p>Sets whether the implementation has an exception by setting or clearing the relevant bit in the flags. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/set_has_error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/set_has_error_is_errno.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/set_has_value.html b/doc/html/reference/policies/base/set_has_value.html
new file mode 100644
index 000000000..a28528c34
--- /dev/null
+++ b/doc/html/reference/policies/base/set_has_value.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void _set_has_value(Impl &amp;&amp;, bool) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/set_has_error.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void _set_has_value(Impl &amp;&amp;, bool) noexcept</code></h1></div></div></div>
+  <p>Sets whether the implementation has a value by setting or clearing the relevant bit in the flags. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/set_has_error.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/ub.html b/doc/html/reference/policies/base/ub.html
new file mode 100644
index 000000000..1640fb37b
--- /dev/null
+++ b/doc/html/reference/policies/base/ub.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static void _ub(Impl &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/has_value.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static void _ub(Impl &amp;&amp;)</code></h1></div></div></div>
+  <p>This is a special function which does compiler-specific stuff to tell the compiler that this function can never, ever, ever be executed. The compiler&rsquo;s optimiser will <strong>hard assume</strong> that this function can never be executed, and will prune the possibility of it being executed completely. Generally this means that the code path stops dead, and if execution does proceed down this path, it will run off the end of a branch which doesn&rsquo;t go anywhere. Your program will have lost known state, and usually it will trash memory and registers and crash.</p>
+
+<p>This may seem highly undesirable. However, it also means that the optimiser can optimise more strongly, and so long as you never actually do execute this branch, you do get higher quality code generation.</p>
+
+<p>If the <code>NDEBUG</code> macro is not defined, an <code>BOOST_OUTCOME_ASSERT(false)</code> is present. This will cause attempts to execute this function to fail in a very obvious way, but it also generates runtime code to trigger the obvious failure.</p>
+
+<p>If the <code>NDEBUG</code> macro is defined, and the program is compiled with the undefined behaviour sanitiser, attempts to execute this function will trigger an undefined behaviour sanitiser action.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Zero runtime overhead if <code>NDEBUG</code> is defined, guaranteed. If this function returns, your program is now in hard loss of known program state. <em>Usually</em>, but not always, it will crash at some point later. <em>Rarely</em> it will corrupt registers and memory, and keep going.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: December 16, 2023 at 20:51:26 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/has_value.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/base/value.html b/doc/html/reference/policies/base/value.html
new file mode 100644
index 000000000..693043061
--- /dev/null
+++ b/doc/html/reference/policies/base/value.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>static auto &amp;&amp;_value(Impl &amp;&amp;) noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/has_error_is_errno.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/error.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>static auto &amp;&amp;_value(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
+  <p>Returns a reference to the value in the implementation passed in. No checking is done to ensure there is a value. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/policies/base/has_error_is_errno.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/policies/base.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/policies/base/error.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/error_code_throw_as_system_error_outcome.html b/doc/html/reference/policies/error_code_throw_as_system_error_outcome.html
new file mode 100644
index 000000000..ef83c9fbe
--- /dev/null
+++ b/doc/html/reference/policies/error_code_throw_as_system_error_outcome.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>error_code_throw_as_system_error&lt;T, EC, EP&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/all_narrow.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/error_code_throw_as_system_error_result.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>error_code_throw_as_system_error&lt;T, EC, EP&gt;</code></h1></div></div></div>
+  <p><em>Note</em>: This policy class specialisation can only be used with <code>basic_outcome</code>, not <code>basic_result</code>. Use <a href="../../reference/policies/error_code_throw_as_system_error_result.html" class="api-reference"><code>error_code_throw_as_system_error&lt;T, EC, void&gt;</code></a>
+ with <code>basic_result</code>.</p>
+
+<p>Policy class defining that on incorrect wide value observation, <code>EP</code> ought to be rethrown if possible, then the ADL discovered free function <code>outcome_throw_as_system_error_with_payload(impl.assume_error())</code> should be called. <a href="../../reference/functions/policy.html">Some precanned overloads of that function are listed here</a>.</p>
+
+<p>Incorrect wide error observation performs:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_outcome_access</span><span class="p">(</span><span class="s">&#34;no error&#34;</span><span class="p">));</span>
+</code></pre></div>
+<p>Incorrect wide exception observation performs:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_outcome_access</span><span class="p">(</span><span class="s">&#34;no exception&#34;</span><span class="p">));</span>
+</code></pre></div>
+<p>Inherits publicly from <a href="../../reference/policies/base.html" class="api-reference"><code>base</code></a>
+, and its narrow value, error and exception observer policies are inherited from there.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/policy/outcome_error_code_throw_as_system_error.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 23:42:52 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/all_narrow.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/error_code_throw_as_system_error_result.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/error_code_throw_as_system_error_result.html b/doc/html/reference/policies/error_code_throw_as_system_error_result.html
new file mode 100644
index 000000000..afac97642
--- /dev/null
+++ b/doc/html/reference/policies/error_code_throw_as_system_error_result.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>error_code_throw_as_system_error&lt;T, EC, void&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/error_code_throw_as_system_error_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/exception_ptr_rethrow_outcome.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>error_code_throw_as_system_error&lt;T, EC, void&gt;</code></h1></div></div></div>
+  <p><em>Note</em>: This policy class specialisation can only be used with <code>basic_result</code>, not <code>basic_outcome</code>. Use <a href="../../reference/policies/error_code_throw_as_system_error_outcome.html" class="api-reference"><code>error_code_throw_as_system_error&lt;T, EC, EP&gt;</code></a>
+ with <code>basic_outcome</code>.</p>
+
+<p>Policy class defining that the ADL discovered free function <code>outcome_throw_as_system_error_with_payload(impl.assume_error())</code> should be called on incorrect wide value observation. <a href="../../reference/functions/policy.html">Some precanned overloads of that function are listed here</a>.</p>
+
+<p>Incorrect wide error observation performs:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_result_access</span><span class="p">(</span><span class="s">&#34;no error&#34;</span><span class="p">));</span>
+</code></pre></div>
+<p>Inherits publicly from <a href="../../reference/policies/base.html" class="api-reference"><code>base</code></a>
+, and its narrow value, error and exception observer policies are inherited from there.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/policy/result_error_code_throw_as_system_error.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 23:42:52 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/error_code_throw_as_system_error_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/exception_ptr_rethrow_outcome.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/exception_ptr_rethrow_outcome.html b/doc/html/reference/policies/exception_ptr_rethrow_outcome.html
new file mode 100644
index 000000000..0e1c422fc
--- /dev/null
+++ b/doc/html/reference/policies/exception_ptr_rethrow_outcome.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>exception_ptr_rethrow&lt;T, EC, EP&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/error_code_throw_as_system_error_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/exception_ptr_rethrow_result.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>exception_ptr_rethrow&lt;T, EC, EP&gt;</code></h1></div></div></div>
+  <p><em>Note</em>: This policy class specialisation can only be used with <code>basic_outcome</code>, not <code>basic_result</code>. Use <a href="../../reference/policies/exception_ptr_rethrow_result.html" class="api-reference"><code>exception_ptr_rethrow&lt;T, EC, void&gt;</code></a>
+ with <code>basic_result</code>.</p>
+
+<p>Policy class defining that the ADL discovered free function <code>rethrow_exception(impl.assume_exception())</code> if possible, followed by <code>rethrow_exception(impl.assume_error())</code> should be called on incorrect wide value observation. Generally this will ADL discover 
+<a href="https://en.cppreference.com/w/cpp/error/rethrow_exception" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::rethrow_exception()</code></a>
+ or <code>boost::rethrow_exception()</code> depending on the <code>EC</code> type.</p>
+
+<p>Incorrect wide error observation performs:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_outcome_access</span><span class="p">(</span><span class="s">&#34;no error&#34;</span><span class="p">));</span>
+</code></pre></div>
+<p>Incorrect wide exception observation performs:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_outcome_access</span><span class="p">(</span><span class="s">&#34;no exception&#34;</span><span class="p">));</span>
+</code></pre></div>
+<p>Inherits publicly from <a href="../../reference/policies/base.html" class="api-reference"><code>base</code></a>
+, and its narrow value, error and exception observer policies are inherited from there.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/policy/outcome_exception_ptr_rethrow.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 23:42:52 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/error_code_throw_as_system_error_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/exception_ptr_rethrow_result.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/exception_ptr_rethrow_result.html b/doc/html/reference/policies/exception_ptr_rethrow_result.html
new file mode 100644
index 000000000..766e7fe86
--- /dev/null
+++ b/doc/html/reference/policies/exception_ptr_rethrow_result.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>exception_ptr_rethrow&lt;T, EC, void&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/exception_ptr_rethrow_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/fail_to_compile_observers.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>exception_ptr_rethrow&lt;T, EC, void&gt;</code></h1></div></div></div>
+  <p><em>Note</em>: This policy class specialisation can only be used with <code>basic_result</code>, not <code>basic_outcome</code>. Use <a href="../../reference/policies/exception_ptr_rethrow_outcome.html" class="api-reference"><code>exception_ptr_rethrow&lt;T, EC, EP&gt;</code></a>
+ with <code>basic_outcome</code>.</p>
+
+<p>Policy class defining that the ADL discovered free function <code>rethrow_exception(impl.assume_error())</code> should be called on incorrect wide value observation. Generally this will ADL discover 
+<a href="https://en.cppreference.com/w/cpp/error/rethrow_exception" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::rethrow_exception()</code></a>
+ or <code>boost::rethrow_exception()</code> depending on the <code>EC</code> type.</p>
+
+<p>Incorrect wide error observation performs:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_result_access</span><span class="p">(</span><span class="s">&#34;no error&#34;</span><span class="p">));</span>
+</code></pre></div>
+<p>Inherits publicly from <a href="../../reference/policies/base.html" class="api-reference"><code>base</code></a>
+, and its narrow value, error and exception observer policies are inherited from there.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/policy/result_exception_ptr_rethrow.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 23:42:52 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/exception_ptr_rethrow_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/fail_to_compile_observers.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/fail_to_compile_observers.html b/doc/html/reference/policies/fail_to_compile_observers.html
new file mode 100644
index 000000000..dfdf4f783
--- /dev/null
+++ b/doc/html/reference/policies/fail_to_compile_observers.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>fail_to_compile_observers - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/exception_ptr_rethrow_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/terminate.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>fail_to_compile_observers</code></h1></div></div></div>
+  <p>Upon attempting to compile the wide observer policy functions, the following static assertion occurs which fails the build:</p>
+
+<blockquote>
+<p><em>Attempt to wide observe value, error or exception for a result/outcome given an EC or E type which is not void, and for whom trait::has_error_code_v<EC>, trait::has_exception_ptr_v<EC>, and trait::has_exception_ptr_v<E> are all false. Please specify a NoValuePolicy to tell result/outcome what to do, or else use a more specific convenience type alias such as unchecked<T, E> to indicate you want the wide observers to be narrow, or checked<T, E> to indicate you always want an exception throw etc.</em></p>
+</blockquote>
+
+<p>This failure to compile was introduced after the Boost peer review of v2.0 of Outcome due to feedback that users were too often surprised by the default selection of the <a href="../../reference/policies/all_narrow.html" class="api-reference"><code>all_narrow</code></a>
+ policy if the types were unrecognised. It was felt this introduced too much danger in the default configuration, so to ensure that existing code based on Outcome broke very loudly after an upgrade, the above very verbose static assertion was implemented.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/policy/fail_to_compile_observers.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 23, 2019 at 01:27:31 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/exception_ptr_rethrow_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/terminate.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/terminate.html b/doc/html/reference/policies/terminate.html
new file mode 100644
index 000000000..ad5101843
--- /dev/null
+++ b/doc/html/reference/policies/terminate.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>terminate - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/fail_to_compile_observers.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/throw_bad_result_access.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>terminate</code></h1></div></div></div>
+  <p>Policy class defining that 
+<a href="https://en.cppreference.com/w/cpp/error/terminate" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::terminate()</code></a>
+ should be called on incorrect wide value, error or exception observation.</p>
+
+<p>Inherits publicly from <a href="../../reference/policies/base.html" class="api-reference"><code>base</code></a>
+, and its narrow value, error and exception observer policies are inherited from there.</p>
+
+<p>Included by <code>&lt;basic_result.hpp&gt;</code>, and so is always available when <code>basic_result</code> is available.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/policy/terminate.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 22, 2019 at 01:11:40 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/fail_to_compile_observers.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/policies/throw_bad_result_access.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/policies/throw_bad_result_access.html b/doc/html/reference/policies/throw_bad_result_access.html
new file mode 100644
index 000000000..eecaf3db9
--- /dev/null
+++ b/doc/html/reference/policies/throw_bad_result_access.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>throw_bad_result_access&lt;EC&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/terminate.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>throw_bad_result_access&lt;EC&gt;</code></h1></div></div></div>
+  <p>Policy class defining that <a href="../../reference/types/bad_result_access_with.html" class="api-reference"><code>bad_result_access_with&lt;EC&gt;</code></a>
+ should be thrown on incorrect wide value observation. The primary purpose of this policy is to enable standing in for 
+<a href="https://wg21.link/P0323" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> P0323 <code>std::expected&lt;T, E&gt;</code></a>
+ which throws a <code>bad_expected_access&lt;E&gt;</code> on incorrect wide value observation. This is why it is only ever <code>EC</code> which is thrown with <code>bad_result_access_with&lt;EC&gt;</code> on value observation only, and only when there is an error available.</p>
+
+<p>If used in <code>basic_outcome</code>, and the outcome is exceptioned and so no error is available, incorrect wide value observation performs instead:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_result_access</span><span class="p">(</span><span class="s">&#34;no value&#34;</span><span class="p">));</span>
+</code></pre></div>
+<p>Incorrect wide error observation performs:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_result_access</span><span class="p">(</span><span class="s">&#34;no error&#34;</span><span class="p">));</span>
+</code></pre></div>
+<p>Incorrect wide exception observation performs:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_THROW_EXCEPTION</span><span class="p">(</span><span class="n">bad_outcome_access</span><span class="p">(</span><span class="s">&#34;no exception&#34;</span><span class="p">));</span>
+</code></pre></div>
+<p>Inherits publicly from <a href="../../reference/policies/base.html" class="api-reference"><code>base</code></a>
+, and its narrow value, error and exception observer policies are inherited from there.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::policy</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/policy/throw_bad_result_access.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 23, 2019 at 01:27:31 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/policies/terminate.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/policies.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/traits.html b/doc/html/reference/traits.html
new file mode 100644
index 000000000..b60aa2144
--- /dev/null
+++ b/doc/html/reference/traits.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Traits - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../reference/converters/value_or_error.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/traits/is_basic_outcome.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Traits</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../reference/traits/is_basic_outcome.html" ><code>is_basic_outcome&lt;T&gt;</code></a>
+<p>An integral constant type true for <code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code> types.</p><li>
+	<a href="../reference/traits/is_basic_result.html" ><code>is_basic_result&lt;T&gt;</code></a>
+<p>An integral constant type true for <code>basic_result&lt;T, E, NoValuePolicy&gt;</code> types.</p><li>
+	<a href="../reference/traits/is_error_code_available.html" ><code>is_error_code_available&lt;T&gt;</code></a>
+<p>True if an error code can be constructed from a <code>T</code>.</p><li>
+	<a href="../reference/traits/is_error_type.html" ><code>is_error_type&lt;E&gt;</code></a>
+<p>A customisable integral constant type true for <code>E</code> types which are to receive error throwing no-value policies.</p><li>
+	<a href="../reference/traits/is_error_type_enum.html" ><code>is_error_type_enum&lt;E, Enum&gt;</code></a>
+<p>A customisable integral constant type true for <code>E</code> types constructible from <code>Enum</code> types which are to receive error throwing no-value policies.</p><li>
+	<a href="../reference/traits/is_exception_ptr_available.html" ><code>is_exception_ptr_available&lt;T&gt;</code></a>
+<p>True if an exception ptr can be constructed from a <code>T</code>.</p><li>
+	<a href="../reference/traits/is_failure_type.html" ><code>is_failure_type&lt;T&gt;</code></a>
+<p>An integral constant boolean variable true for <code>failure_type&lt;EC, E = void&gt;</code> types.</p><li>
+	<a href="../reference/traits/is_move_bitcopying.html" ><code>is_move_bitcopying&lt;T&gt;</code></a>
+<p>(&gt;= Outcome v2.2.0) A customisable integral constant type true for <code>T</code> types which are move bitcopying safe.</p><li>
+	<a href="../reference/traits/is_success_type.html" ><code>is_success_type&lt;T&gt;</code></a>
+<p>An integral constant boolean variable true for <code>success_type&lt;T&gt;</code> types.</p><li>
+	<a href="../reference/traits/type_can_be_used_in_basic_result.html" ><code>type_can_be_used_in_basic_result&lt;R&gt;</code></a>
+<p>A constexpr boolean true for types permissible in <code>basic_result&lt;T, E, NoValuePolicy&gt;</code>.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 13, 2018 at 17:36:11 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../reference/converters/value_or_error.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/traits/is_basic_outcome.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/traits/is_basic_outcome.html b/doc/html/reference/traits/is_basic_outcome.html
new file mode 100644
index 000000000..6843aba88
--- /dev/null
+++ b/doc/html/reference/traits/is_basic_outcome.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>is_basic_outcome&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>is_basic_outcome&lt;T&gt;</code></h1></div></div></div>
+  <p>An integral constant type true for <a href="../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+ types. This does not match anything not exactly a <code>basic_outcome</code>. If you want to match types like <code>basic_outcome</code> but not equal to it, consider <a href="../../reference/concepts/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T&gt;</code></a>
+..</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_outcome.hpp&gt;</code></p>
+
+<p><em>Variable alias</em>: <code>is_basic_outcome_v&lt;T&gt;</code></p>
+
+
+        </div><p><small>Last revised: May 24, 2020 at 12:48:39 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/traits/is_basic_result.html b/doc/html/reference/traits/is_basic_result.html
new file mode 100644
index 000000000..528b7ff2b
--- /dev/null
+++ b/doc/html/reference/traits/is_basic_result.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>is_basic_result&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_basic_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>is_basic_result&lt;T&gt;</code></h1></div></div></div>
+  <p>An integral constant type true for <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ types. This does not match anything not exactly a <code>basic_result</code>. If you want to match types like <code>basic_result</code> but not equal to it, consider <a href="../../reference/concepts/basic_result.html" class="api-reference"><code>basic_result&lt;T&gt;</code></a>
+ or <a href="../../reference/concepts/value_or_error.html" class="api-reference"><code>value_or_error&lt;T&gt;</code></a>
+.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+<p><em>Variable alias</em>: <code>is_basic_result_v&lt;T&gt;</code></p>
+
+
+        </div><p><small>Last revised: May 24, 2020 at 12:48:39 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_basic_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/traits/is_error_code_available.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/traits/is_error_code_available.html b/doc/html/reference/traits/is_error_code_available.html
new file mode 100644
index 000000000..5a646b8f2
--- /dev/null
+++ b/doc/html/reference/traits/is_error_code_available.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>is_error_code_available&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_basic_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/traits/is_error_type.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>is_error_code_available&lt;T&gt;</code></h1></div></div></div>
+  <p><code>::value</code> is true if an error code can be constructed from a <code>T</code> e.g. if there exists an ADL discovered free function <code>make_error_code(T)</code>.
+<code>::type</code> is the type that would result if <code>::value</code> is true, else <code>void</code>.</p>
+
+<p><em>Overridable</em>: By template specialisation into the <code>trait</code> namespace.</p>
+
+<p><em>Default</em>: True if <code>T</code> is an error code, else to metaprogramming which performs the ADL discovery of <code>make_error_code(T)</code>. Note that the STL defines multiple overloads of an ADL discovered free function 
+<a href="https://en.cppreference.com/mwiki/index.php?title=Special%3ASearch&search=make_error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::make_error_code(T)</code></a>
+ for its error enumerations, as does Boost.System for the Boost error enumerations. Thus this trait will pick up those free functions for those error types.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::trait</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/trait.hpp&gt;</code></p>
+
+<p><em>Variable alias</em>: <code>is_error_code_available_v&lt;T&gt;</code></p>
+
+
+        </div><p><small>Last revised: October 10, 2019 at 18:14:56 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_basic_result.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/traits/is_error_type.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/traits/is_error_type.html b/doc/html/reference/traits/is_error_type.html
new file mode 100644
index 000000000..d6b6adace
--- /dev/null
+++ b/doc/html/reference/traits/is_error_type.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>is_error_type&lt;E&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_error_code_available.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/traits/is_error_type_enum.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>is_error_type&lt;E&gt;</code></h1></div></div></div>
+  <p>A customisable integral constant type true for <code>E</code> types which are to receive
+error throwing no-value policies. Special weakened implicit construction enable
+is available for integral <code>T</code> types when combined with <code>E</code> types in this
+whitelist &ndash; this permits <code>boost_result&lt;int, boost::system::errc::errc_t</code> to
+retain its implicit constructors, despite the fact that <code>errc_t</code> as a C enum
+has an implicit conversion to <code>int</code>.</p>
+
+<p><em>Overridable</em>: By template specialisation into the <code>trait</code> namespace.</p>
+
+<p><em>Default</em>: False. Specialisations to true exist for:</p>
+
+<ul>
+<li><p><code>&lt;boost/outcome/boost_result.hpp&gt;</code></p>
+
+<ul>
+<li><code>boost::system::error_code</code></li>
+<li><code>boost::system::errc::errc_t</code></li>
+<li><code>boost::exception_ptr</code></li>
+</ul></li>
+
+<li><p><code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
+
+<ul>
+<li><code>std::error_code</code></li>
+<li><code>std::errc</code></li>
+<li><code>std::exception_ptr</code></li>
+</ul></li>
+</ul>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::trait</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/trait.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: October 11, 2019 at 17:03:05 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_error_code_available.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/traits/is_error_type_enum.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/traits/is_error_type_enum.html b/doc/html/reference/traits/is_error_type_enum.html
new file mode 100644
index 000000000..2f50ef6d3
--- /dev/null
+++ b/doc/html/reference/traits/is_error_type_enum.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>is_error_type_enum&lt;E, Enum&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>is_error_type_enum&lt;E, Enum&gt;</code></h1></div></div></div>
+  <p>A customisable integral constant type true for <code>E</code> types constructible from <code>Enum</code> types which are to receive error throwing no-value policies</p>
+
+<p><em>Overridable</em>: By template specialisation into the <code>trait</code> namespace.</p>
+
+<p><em>Default</em>: False. Specialisations exist for:</p>
+
+<ul>
+<li><p><code>&lt;boost/outcome/boost_result.hpp&gt;</code></p>
+
+<ul>
+<li><code>boost::system::error_code</code> to <code>boost::system::is_error_condition_enum&lt;Enum&gt;::value</code>.</li>
+</ul></li>
+
+<li><p><code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
+
+<ul>
+<li><code>std::error_code</code> to <code>std::is_error_condition_enum&lt;Enum&gt;::value</code>.</li>
+</ul></li>
+</ul>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::trait</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/trait.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: December 13, 2018 at 17:36:11 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_error_type.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/reference/traits/is_exception_ptr_available.html b/doc/html/reference/traits/is_exception_ptr_available.html
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+++ b/doc/html/reference/traits/is_exception_ptr_available.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>is_exception_ptr_available&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_error_type_enum.html"><img src="../../images/prev.png" alt="Prev"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>is_exception_ptr_available&lt;T&gt;</code></h1></div></div></div>
+  <p><code>::value</code> is true if an exception ptr can be constructed from a <code>T</code> e.g. if there exists an ADL discovered free function <code>make_exception_ptr(T)</code>.
+<code>::type</code> is the type that would result if <code>::value</code> is true, else <code>void</code>.</p>
+
+<p><em>Overridable</em>: By template specialisation into the <code>trait</code> namespace.</p>
+
+<p><em>Default</em>: True if <code>T</code> is an exception ptr, else to metaprogramming which performs the ADL discovery of <code>make_exception_ptr(T)</code>. Note that the STL defines an ADL discovered free function 
+<a href="https://en.cppreference.com/w/cpp/error/make_exception_ptr" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::make_exception_ptr(T)</code></a>
+. Thus this trait will pick up that free function.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::trait</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/trait.hpp&gt;</code></p>
+
+<p><em>Variable alias</em>: <code>is_exception_ptr_available_v&lt;T&gt;</code></p>
+
+
+        </div><p><small>Last revised: October 10, 2019 at 18:14:56 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_error_type_enum.html"><img src="../../images/prev.png" alt="Prev"></a>
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+</html>
diff --git a/doc/html/reference/traits/is_failure_type.html b/doc/html/reference/traits/is_failure_type.html
new file mode 100644
index 000000000..1d41546c3
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+++ b/doc/html/reference/traits/is_failure_type.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>is_failure_type&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_exception_ptr_available.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>is_failure_type&lt;T&gt;</code></h1></div></div></div>
+  <p>An integral constant boolean variable true for <a href="../../reference/types/failure_type.html" class="api-reference"><code>failure_type&lt;EC, EP = void&gt;</code></a>
+ types.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/success_failure.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_exception_ptr_available.html"><img src="../../images/prev.png" alt="Prev"></a>
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+</html>
diff --git a/doc/html/reference/traits/is_move_bitcopying.html b/doc/html/reference/traits/is_move_bitcopying.html
new file mode 100644
index 000000000..d2f0fc08b
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+++ b/doc/html/reference/traits/is_move_bitcopying.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>is_move_bitcopying&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>is_move_bitcopying&lt;T&gt;</code></h1></div></div></div>
+  <p>A customisable integral constant type true for <code>T</code> types which are move bitcopying
+safe. As per <a href="https://wg21.link/P1029">P1029 move bitcopying</a>, these are types for
+which:</p>
+
+<ol>
+<li>There is an inline, constexpr-available, default constructor.</li>
+<li>The move constructor has side effects equivalent to <code>memcpy</code> of source to destination,
+followed by a <code>memcpy</code> of a default constructed instance to source.</li>
+<li>That the destruction of a default constructed instance has no visible
+side effects.</li>
+</ol>
+
+<p>This implies that if you move from a bit copying type, you need not call its
+destructor, even if that is a virtual destructor.</p>
+
+<p>If you opt your types into this trait, Outcome will track moved-from state and
+not call the destructor for your type on moved-from instances. Obviously enough
+this is, in current C++ standards, undefined behaviour. However it very
+significantly improves the quality of codegen during inlining.</p>
+
+<p><em>Overridable</em>: By template specialisation into the <code>trait</code> namespace.</p>
+
+<p><em>Default</em>: False. Default specialisations exist for:</p>
+
+<ul>
+<li><code>&lt;boost/outcome/experimental/status_result.hpp&gt;</code>
+
+<ul>
+<li>True for <code>BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code&lt;DomainType&gt;</code> if trait
+<code>BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::traits::is_move_bitcopying&lt;BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code&lt;DomainType&gt;&gt;::value</code>
+is true.</li>
+<li>True for <code>BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::errored_status_code&lt;DomainType&gt;</code> if trait
+<code>BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::traits::is_move_bitcopying&lt;BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::errored_status_code&lt;DomainType&gt;&gt;::value</code>
+is true.</li>
+</ul></li>
+</ul>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::trait</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/trait.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_failure_type.html"><img src="../../images/prev.png" alt="Prev"></a>
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+</html>
diff --git a/doc/html/reference/traits/is_success_type.html b/doc/html/reference/traits/is_success_type.html
new file mode 100644
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+++ b/doc/html/reference/traits/is_success_type.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>is_success_type&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_move_bitcopying.html"><img src="../../images/prev.png" alt="Prev"></a>
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+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/traits/type_can_be_used_in_basic_result.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>is_success_type&lt;T&gt;</code></h1></div></div></div>
+  <p>An integral constant boolean variable true for <a href="../../reference/types/success_type.html" class="api-reference"><code>success_type&lt;T&gt;</code></a>
+ types.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/success_failure.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 21, 2019 at 18:00:41 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_move_bitcopying.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/reference/traits/type_can_be_used_in_basic_result.html b/doc/html/reference/traits/type_can_be_used_in_basic_result.html
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--- /dev/null
+++ b/doc/html/reference/traits/type_can_be_used_in_basic_result.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>type_can_be_used_in_basic_result&lt;R&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>type_can_be_used_in_basic_result&lt;R&gt;</code></h1></div></div></div>
+  <p>A constexpr boolean true for types permissible in <code>basic_result&lt;T, E, NoValuePolicy&gt;</code>.</p>
+
+<p><em>Overridable</em>: Not overridable.</p>
+
+<p><em>Definition</em>: True for a type which:</p>
+
+<ul>
+<li>Is not a reference.</li>
+<li>Is not an <a href="../../reference/types/in_place_type_t.html" class="api-reference"><code>in_place_type_t&lt;T&gt;</code></a>
+.</li>
+<li>Is not a <a href="../../reference/types/success_type.html" class="api-reference"><code>success_type&lt;T&gt;</code></a>
+.</li>
+<li>Is not a <a href="../../reference/types/failure_type.html" class="api-reference"><code>failure_type&lt;EC, EP = void&gt;</code></a>
+.</li>
+<li>Is not an array.</li>
+<li>Is either <code>void</code>, or else is an <code>Object</code> and is <code>Destructible</code>.</li>
+</ul>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::trait</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/trait.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/traits/is_success_type.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/traits.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/types.html b/doc/html/reference/types.html
new file mode 100644
index 000000000..b8aba69ff
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+++ b/doc/html/reference/types.html
@@ -0,0 +1,332 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Types - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../reference/policies/throw_bad_result_access.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/types/basic_outcome.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Types</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../reference/types/basic_outcome.html" ><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+<p>A type carrying one of (i) a successful <code>T</code> (ii) a disappointment <code>EC</code> (iii) a failure <code>EP</code> (iv) both a disappointment <code>EC</code> and a failure <code>EP</code>, with <code>NoValuePolicy</code> specifying what to do if one tries to read state which isn&rsquo;t there.</p><ol><li>
+	<a href="../reference/types/basic_outcome/default.html" ><code>basic_outcome() = delete</code></a>
+<p>The default constructor (disabled).</p><li>
+	<a href="../reference/types/basic_outcome/move_constructor.html" ><code>basic_outcome(basic_outcome &amp;&amp;)</code></a>
+<p>Move constructor. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/copy_constructor.html" ><code>basic_outcome(const basic_outcome &amp;)</code></a>
+<p>Copy constructor. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/move_assignment.html" ><code>basic_outcome &amp;operator=(basic_outcome &amp;&amp;)</code></a>
+<p>Move assignment. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/copy_assignment.html" ><code>basic_outcome &amp;operator=(const basic_outcome &amp;)</code></a>
+<p>Copy assignment. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/destructor.html" ><code>~basic_outcome()</code></a>
+<p>Destructor. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/disabling_catchall.html" ><code>basic_outcome(Args...) = delete</code></a>
+<p>Disabling catchall constructor used to give useful diagnostic error when trying to use non-inplace constructors when <code>predicate::constructors_enabled</code> is false.</p><li>
+	<a href="../reference/types/basic_outcome/disabling_implicit_constructor.html" ><code>basic_outcome(X &amp;&amp;) = delete</code></a>
+<p>Disabling implicit constructor used to give useful diagnostic error when trying to use implicit constructors when <code>predicate::implicit_constructors_enabled</code> is false.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_value_converting_constructor.html" ><code>basic_outcome(R &amp;&amp;)</code></a>
+<p>Implicit <code>value_type</code> constructor. Available if <code>predicate::enable_value_converting_constructor&lt;R&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_error_converting_constructor.html" ><code>basic_outcome(S &amp;&amp;)</code></a>
+<p>Implicit <code>error_type</code> constructor. Available if <code>predicate::enable_error_converting_constructor&lt;S&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_error_condition_converting_constructor.html" ><code>basic_outcome(ErrorCondEnum &amp;&amp;)</code></a>
+<p>Implicit <code>error_type</code> from <code>ErrorCondEnum</code> constructor. Available if <code>predicate::enable_error_condition_converting_constructor&lt;ErrorCondEnum&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_exception_converting_constructor.html" ><code>basic_outcome(P &amp;&amp;)</code></a>
+<p>Implicit <code>exception_type</code> constructor. Available if <code>predicate::enable_exception_converting_constructor&lt;P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_error_exception_converting_constructor.html" ><code>basic_outcome(S &amp;&amp;, P &amp;&amp;)</code></a>
+<p>Implicit <code>error_type</code> + <code>exception_type</code> constructor. Available if <code>predicate::enable_error_exception_converting_constructor&lt;S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html" ><code>explicit basic_outcome(concepts::value_or_error&lt;T, E&gt; &amp;&amp;)</code></a>
+<p>Explicit converting constructor from <code>concepts::value_or_error&lt;T, E&gt;</code> concept matching types. Available if <code>convert::value_or_error&lt;&gt;</code> permits it. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_copy_converting_constructor.html" ><code>explicit basic_outcome(const basic_outcome&lt;A, B, C, D&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_outcome</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, C, D&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_move_converting_constructor.html" ><code>explicit basic_outcome(basic_outcome&lt;A, B, C, D&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_outcome</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, C, D&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_result_copy_converting_constructor.html" ><code>explicit basic_outcome(const basic_result&lt;A, B, C&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_result_move_converting_constructor.html" ><code>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_result_make_error_code_copy_converting_constructor.html" ><code>explicit basic_outcome(const basic_result&lt;A, B, C&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_result_make_error_code_move_converting_constructor.html" ><code>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_inplace_value_constructor.html" ><code>explicit basic_outcome(in_place_type_t&lt;value_type_if_enabled&gt;, Args ...)</code></a>
+<p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_inplace_value_constructor_il.html" ><code>explicit basic_outcome(in_place_type_t&lt;value_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
+<p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_inplace_error_constructor.html" ><code>explicit basic_outcome(in_place_type_t&lt;error_type_if_enabled&gt;, Args ...)</code></a>
+<p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_inplace_error_constructor_il.html" ><code>explicit basic_outcome(in_place_type_t&lt;error_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
+<p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_inplace_exception_constructor.html" ><code>explicit basic_outcome(in_place_type_t&lt;exception_type_if_enabled&gt;, Args ...)</code></a>
+<p>Explicit inplace exception constructor. Available if <code>predicate::enable_inplace_exception_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/explicit_inplace_exception_constructor_il.html" ><code>explicit basic_outcome(in_place_type_t&lt;exception_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
+<p>Explicit inplace exception constructor. Available if <code>predicate::enable_inplace_exception_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_inplace_value_error_exception_constructor.html" ><code>basic_outcome(A1 &amp;&amp;, A2 &amp;&amp;, Args ...)</code></a>
+<p>Implicit inplace value or error or exception constructor. Available if <code>predicate::enable_inplace_value_error_exception_constructor&lt;A1, A2, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_success_copy_constructor.html" ><code>basic_outcome(const success_type&lt;T&gt; &amp;)</code></a>
+<p>Implicit value-from-success-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_success_move_constructor.html" ><code>basic_outcome(success_type&lt;T&gt; &amp;&amp;)</code></a>
+<p>Implicit value-from-success-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_failure_error_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EC&gt; &amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_failure_error_move_constructor.html" ><code>basic_outcome(failure_type&lt;EC&gt; &amp;&amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_failure_error_make_error_code_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EC&gt; &amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_failure_error_make_error_code_move_constructor.html" ><code>basic_outcome(failure_type&lt;EC&gt; &amp;&amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_failure_exception_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EP&gt; &amp;)</code></a>
+<p>Implicit exception-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, void, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_failure_exception_move_constructor.html" ><code>basic_outcome(failure_type&lt;EP&gt; &amp;&amp;)</code></a>
+<p>Implicit exception-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, void, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_failure_error_exception_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EC, EP&gt; &amp;)</code></a>
+<p>Implicit error-and-exception-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/implicit_failure_error_exception_move_constructor.html" ><code>basic_outcome(failure_type&lt;EC, EP&gt; &amp;&amp;)</code></a>
+<p>Implicit error-and-exception-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/operator_bool.html" ><code>explicit operator bool() const noexcept</code></a>
+<p>Returns true if a value is present. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/has_value.html" ><code>bool has_value() const noexcept</code></a>
+<p>Returns true if a value is present. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/has_error.html" ><code>bool has_error() const noexcept</code></a>
+<p>Returns true if an error is present. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/has_exception.html" ><code>bool has_exception() const noexcept</code></a>
+<p>Returns true if an exception is present. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/has_failure.html" ><code>bool has_failure() const noexcept</code></a>
+<p>Returns true if there is either an error or an exception. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/assume_value_lvalue.html" ><code>value_type &amp;assume_value() &amp; noexcept</code></a>
+<p>Narrow contract lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/assume_value_lvalue_const.html" ><code>const value_type &amp;assume_value() const &amp; noexcept</code></a>
+<p>Narrow contract const lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/assume_value_rvalue.html" ><code>value_type &amp;&amp;assume_value() &amp;&amp; noexcept</code></a>
+<p>Narrow contract rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/assume_value_rvalue_const.html" ><code>const value_type &amp;&amp;assume_value() const &amp;&amp; noexcept</code></a>
+<p>Narrow contract const rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/value_lvalue.html" ><code>value_type &amp;value() &amp;</code></a>
+<p>Wide contract lvalue reference observer of any value present. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/value_lvalue_const.html" ><code>const value_type &amp;value() const &amp;</code></a>
+<p>Wide contract const lvalue reference observer of any value present. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/value_rvalue.html" ><code>value_type &amp;&amp;value() &amp;&amp;</code></a>
+<p>Wide contract rvalue reference observer of any value present. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/value_rvalue_const.html" ><code>const value_type &amp;&amp;value() const &amp;&amp;</code></a>
+<p>Wide contract const rvalue reference observer of any value present. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/assume_error_lvalue.html" ><code>error_type &amp;assume_error() &amp; noexcept</code></a>
+<p>Narrow contract lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/assume_error_lvalue_const.html" ><code>const error_type &amp;assume_error() const &amp; noexcept</code></a>
+<p>Narrow contract const lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/assume_error_rvalue.html" ><code>error_type &amp;&amp;assume_error() &amp;&amp; noexcept</code></a>
+<p>Narrow contract rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/assume_error_rvalue_const.html" ><code>const error_type &amp;&amp;assume_error() const &amp;&amp; noexcept</code></a>
+<p>Narrow contract const rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/error_lvalue.html" ><code>error_type &amp;error() &amp;</code></a>
+<p>Wide contract lvalue reference observer of the stored error. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/error_lvalue_const.html" ><code>const error_type &amp;error() const &amp;</code></a>
+<p>Wide contract const lvalue reference observer of the stored error. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/error_rvalue.html" ><code>error_type &amp;&amp;error() &amp;&amp;</code></a>
+<p>Wide contract rvalue reference observer of the stored error. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/error_rvalue_const.html" ><code>const error_type &amp;&amp;error() const &amp;&amp;</code></a>
+<p>Wide contract const rvalue reference observer of the stored error. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/assume_exception_lvalue.html" ><code>exception_type &amp;assume_exception() &amp; noexcept</code></a>
+<p>Narrow contract lvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/assume_exception_lvalue_const.html" ><code>const exception_type &amp;assume_exception() const &amp; noexcept</code></a>
+<p>Narrow contract const lvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/assume_exception_rvalue_const.html" ><code>const exception_type &amp;&amp;assume_exception() const &amp;&amp; noexcept</code></a>
+<p>Narrow contract const rvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/assume_exception_rvalue.html" ><code>exception_type &amp;&amp;assume_exception() &amp;&amp; noexcept</code></a>
+<p>Narrow contract rvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_outcome/exception_lvalue.html" ><code>exception_type &amp;exception() &amp;</code></a>
+<p>Wide contract lvalue reference observer of the stored exception. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/exception_lvalue_const.html" ><code>const exception_type &amp;exception() const &amp;</code></a>
+<p>Wide contract const lvalue reference observer of the stored exception. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/exception_rvalue.html" ><code>exception_type &amp;&amp;exception() &amp;&amp;</code></a>
+<p>Wide contract rvalue reference observer of the stored exception. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/exception_rvalue_const.html" ><code>const exception_type &amp;&amp;exception() const &amp;&amp;</code></a>
+<p>Wide contract const rvalue reference observer of the stored exception. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_outcome/failure.html" ><code>exception_type failure() const noexcept</code></a>
+<p>Synthesising observer of the stored exception or error. Available if the traits <code>is_error_code_available&lt;T&gt;</code> and <code>is_exception_ptr_available&lt;T&gt;</code> are both true. Never throws.</p><li>
+	<a href="../reference/types/basic_outcome/equality_basic_result.html" ><code>bool operator==(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
+<p>Returns true if this outcome compares equal to the other result. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/equality_basic_outcome.html" ><code>bool operator==(const basic_outcome&lt;A, B, C, D&gt; &amp;) const</code></a>
+<p>Returns true if this outcome compares equal to the other outcome. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/inequality_success_type.html" ><code>bool operator==(const success_type&lt;A&gt; &amp;) const</code></a>
+<p>Returns true if this result compares equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/equality_failure_type.html" ><code>bool operator==(const failure_type&lt;A, B&gt; &amp;) const</code></a>
+<p>Returns true if this outcome compares equal to the failure type sugar. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/inequality_basic_result.html" ><code>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
+<p>Returns true if this outcome does not compare equal to the other result. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/inequality_basic_outcome.html" ><code>bool operator!=(const basic_outcome&lt;A, B, C, D&gt; &amp;) const</code></a>
+<p>Returns true if this outcome does not compare equal to the other outcome. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/equality_success_type.html" ><code>bool operator!=(const success_type&lt;A&gt; &amp;) const</code></a>
+<p>Returns true if this outcome does not compare equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/inequality_failure_type.html" ><code>bool operator!=(const failure_type&lt;A, B&gt; &amp;) const</code></a>
+<p>Returns true if this outcome does not compare equal to the failure type sugar. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/swap.html" ><code>void swap(basic_outcome &amp;)</code></a>
+<p>Swap one basic_outcome with another, with the strong guarantee. Noexcept propagating.</p><li>
+	<a href="../reference/types/basic_outcome/as_failure_lvalue.html" ><code>failure_type&lt;error_type, exception_type&gt; as_failure() const &amp;</code></a>
+<p>Return the output from free function <code>failure()</code> containing a copy of any errored and/or excepted state.</p><li>
+	<a href="../reference/types/basic_outcome/as_failure_rvalue.html" ><code>failure_type&lt;error_type, exception_type&gt; as_failure() &amp;&amp;</code></a>
+<p>Return the output from free function <code>failure()</code> containing a move of any errored and/or excepted state.</p></li></ol><li>
+	<a href="../reference/types/basic_result.html" ><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+<p>A sum type carrying either a successful <code>T</code>, or a disappointment <code>E</code>, with <code>NoValuePolicy</code> specifying what to do if one tries to read state which isn&rsquo;t there.</p><ol><li>
+	<a href="../reference/types/basic_result/default.html" ><code>basic_result() = delete</code></a>
+<p>The default constructor (disabled).</p><li>
+	<a href="../reference/types/basic_result/move_constructor.html" ><code>basic_result(basic_result &amp;&amp;)</code></a>
+<p>Move constructor. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/copy_constructor.html" ><code>basic_result(const basic_result &amp;)</code></a>
+<p>Copy constructor. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/move_assignment.html" ><code>basic_result &amp;operator=(basic_result &amp;&amp;)</code></a>
+<p>Move assignment. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/copy_assignment.html" ><code>basic_result &amp;operator=(const basic_result &amp;)</code></a>
+<p>Copy assignment. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/destructor.html" ><code>~basic_result()</code></a>
+<p>Destructor. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/disabling_catchall.html" ><code>basic_result(Args...) = delete</code></a>
+<p>Disabling catchall constructor used to give useful diagnostic error when trying to use non-inplace constructors when <code>predicate::constructors_enabled</code> is false.</p><li>
+	<a href="../reference/types/basic_result/disabling_implicit_constructor.html" ><code>basic_result(X &amp;&amp;) = delete</code></a>
+<p>Disabling implicit constructor used to give useful diagnostic error when trying to use implicit constructors when <code>predicate::implicit_constructors_enabled</code> is false.</p><li>
+	<a href="../reference/types/basic_result/implicit_value_converting_constructor.html" ><code>basic_result(R &amp;&amp;)</code></a>
+<p>Implicit <code>value_type</code> constructor. Available if <code>predicate::enable_value_converting_constructor&lt;R&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_error_converting_constructor.html" ><code>basic_result(S &amp;&amp;)</code></a>
+<p>Implicit <code>error_type</code> constructor. Available if <code>predicate::enable_error_converting_constructor&lt;S&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_error_condition_converting_constructor.html" ><code>basic_result(ErrorCondEnum &amp;&amp;)</code></a>
+<p>Implicit <code>error_type</code> from <code>ErrorCondEnum</code> constructor. Available if <code>predicate::enable_error_condition_converting_constructor&lt;ErrorCondEnum&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" ><code>explicit basic_result(concepts::value_or_error&lt;T, E&gt; &amp;&amp;)</code></a>
+<p>Explicit converting constructor from <code>concepts::value_or_error&lt;T, E&gt;</code> concept matching types. Available if <code>convert::value_or_error&lt;&gt;</code> permits it. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_copy_converting_constructor.html" ><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_move_converting_constructor.html" ><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_make_error_code_copy_converting_constructor.html" ><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_make_error_code_move_converting_constructor.html" ><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_make_exception_ptr_copy_converting_constructor.html" ><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_make_exception_ptr_move_converting_constructor.html" ><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_inplace_value_constructor.html" ><code>explicit basic_result(in_place_type_t&lt;value_type_if_enabled&gt;, Args ...)</code></a>
+<p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_inplace_value_constructor_il.html" ><code>explicit basic_result(in_place_type_t&lt;value_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
+<p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_inplace_error_constructor.html" ><code>explicit basic_result(in_place_type_t&lt;error_type_if_enabled&gt;, Args ...)</code></a>
+<p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/explicit_inplace_error_constructor_il.html" ><code>explicit basic_result(in_place_type_t&lt;error_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
+<p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_inplace_value_error_constructor.html" ><code>basic_result(A1 &amp;&amp;, A2 &amp;&amp;, Args ...)</code></a>
+<p>Implicit inplace value or error constructor. Available if <code>predicate::enable_inplace_value_error_constructor&lt;A1, A2, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_success_copy_constructor.html" ><code>basic_result(const success_type&lt;T&gt; &amp;)</code></a>
+<p>Implicit value-from-success-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_success_move_constructor.html" ><code>basic_result(success_type&lt;T&gt; &amp;&amp;)</code></a>
+<p>Implicit value-from-success-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_failure_copy_constructor.html" ><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_failure_move_constructor.html" ><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_failure_make_error_code_copy_constructor.html" ><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_failure_make_error_code_move_constructor.html" ><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_failure_make_exception_ptr_copy_constructor.html" ><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/implicit_failure_make_exception_ptr_move_constructor.html" ><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/operator_bool.html" ><code>explicit operator bool() const noexcept</code></a>
+<p>Returns true if a value is present. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_result/has_value.html" ><code>bool has_value() const noexcept</code></a>
+<p>Returns true if a value is present. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_result/has_error.html" ><code>bool has_error() const noexcept</code></a>
+<p>Returns true if an error is present. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_result/has_exception.html" ><code>bool has_exception() const noexcept</code></a>
+<p>Always returns false for <code>basic_result</code>. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_result/has_failure.html" ><code>bool has_failure() const noexcept</code></a>
+<p>Returns true if there is either an error or an exception. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_result/has_lost_consistency.html" ><code>bool has_lost_consistency() const noexcept</code></a>
+<p>Returns true if a preceding swap involving this object failed to preserve the strong guarantee. Constexpr, never throws.</p><li>
+	<a href="../reference/types/basic_result/assume_value_lvalue.html" ><code>value_type &amp;assume_value() &amp; noexcept</code></a>
+<p>Narrow contract lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_result/assume_value_lvalue_const.html" ><code>const value_type &amp;assume_value() const &amp; noexcept</code></a>
+<p>Narrow contract const lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_result/assume_value_rvalue.html" ><code>value_type &amp;&amp;assume_value() &amp;&amp; noexcept</code></a>
+<p>Narrow contract rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_result/assume_value_rvalue_const.html" ><code>const value_type &amp;&amp;assume_value() const &amp;&amp; noexcept</code></a>
+<p>Narrow contract const rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_result/value_lvalue.html" ><code>value_type &amp;value() &amp;</code></a>
+<p>Wide contract lvalue reference observer of any value present. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_result/value_lvalue_const.html" ><code>const value_type &amp;value() const &amp;</code></a>
+<p>Wide contract const lvalue reference observer of any value present. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_result/value_rvalue.html" ><code>value_type &amp;&amp;value() &amp;&amp;</code></a>
+<p>Wide contract rvalue reference observer of any value present. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_result/value_rvalue_const.html" ><code>const value_type &amp;&amp;value() const &amp;&amp;</code></a>
+<p>Wide contract const rvalue reference observer of any value present. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_result/assume_error_lvalue.html" ><code>error_type &amp;assume_error() &amp; noexcept</code></a>
+<p>Narrow contract lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_result/assume_error_lvalue_const.html" ><code>const error_type &amp;assume_error() const &amp; noexcept</code></a>
+<p>Narrow contract const lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_result/assume_error_rvalue.html" ><code>error_type &amp;&amp;assume_error() &amp;&amp; noexcept</code></a>
+<p>Narrow contract rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_result/assume_error_rvalue_const.html" ><code>const error_type &amp;&amp;assume_error() const &amp;&amp; noexcept</code></a>
+<p>Narrow contract const rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+	<a href="../reference/types/basic_result/error_lvalue.html" ><code>error_type &amp;error() &amp;</code></a>
+<p>Wide contract lvalue reference observer of the stored error. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_result/error_lvalue_const.html" ><code>const error_type &amp;error() const &amp;</code></a>
+<p>Wide contract const lvalue reference observer of the stored error. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_result/error_rvalue.html" ><code>error_type &amp;&amp;error() &amp;&amp;</code></a>
+<p>Wide contract rvalue reference observer of the stored error. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_result/error_rvalue_const.html" ><code>const error_type &amp;&amp;error() const &amp;&amp;</code></a>
+<p>Wide contract const rvalue reference observer of the stored error. Constexpr propagating.</p><li>
+	<a href="../reference/types/basic_result/equality_basic_result.html" ><code>bool operator==(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
+<p>Returns true if this result compares equal to the other result. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/inequality_success_type.html" ><code>bool operator==(const success_type&lt;A&gt; &amp;) const</code></a>
+<p>Returns true if this result compares equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/equality_failure_type.html" ><code>bool operator==(const failure_type&lt;A, void&gt; &amp;) const</code></a>
+<p>Returns true if this result compares equal to the failure type sugar. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/inequality_basic_result.html" ><code>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
+<p>Returns true if this result does not compare equal to the other result. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/equality_success_type.html" ><code>bool operator!=(const success_type&lt;A&gt; &amp;) const</code></a>
+<p>Returns true if this result does not compare equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/inequality_failure_type.html" ><code>bool operator!=(const failure_type&lt;A, void&gt; &amp;) const</code></a>
+<p>Returns true if this result does not compare equal to the failure type sugar. Constexpr and noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/swap.html" ><code>void swap(basic_result &amp;)</code></a>
+<p>Swap one basic_result with another, with the strong guarantee. Noexcept propagating.</p><li>
+	<a href="../reference/types/basic_result/as_failure_lvalue.html" ><code>auto as_failure() const &amp;</code></a>
+<p>Return the output from free function <code>failure()</code> containing a copy of any errored state.</p><li>
+	<a href="../reference/types/basic_result/as_failure_rvalue.html" ><code>auto as_failure() &amp;&amp;</code></a>
+<p>Return the output from free function <code>failure()</code> containing a move of any errored state.</p></li></ol><li>
+	<a href="../reference/types/bad_outcome_access.html" ><code>bad_outcome_access</code></a>
+<p>Exception type publicly inheriting from <code>std::logic_error</code> indicating an incorrect observation of value or error or exception occurred.</p><li>
+	<a href="../reference/types/bad_result_access_with.html" ><code>bad_result_access_with&lt;EC&gt;</code></a>
+<p>Exception type publicly inheriting from <code>bad_result_access</code> indicating an incorrect observation of value occurred, supplying the error value.</p><li>
+	<a href="../reference/types/bad_result_access.html" ><code>bad_result_access</code></a>
+<p>Exception type publicly inheriting from <code>std::logic_error</code> indicating an incorrect observation of value or error occurred.</p><li>
+	<a href="../reference/types/awaitables/eager.html" ><code>eager&lt;T, Executor = void&gt;/atomic_eager&lt;T, Executor = void&gt;</code></a>
+<p>An eagerly evaluated coroutine awaitable with Outcome customisation.</p><li>
+	<a href="../reference/types/failure_type.html" ><code>failure_type&lt;EC, EP = void&gt;</code></a>
+<p>Type sugar for constructing an unsuccessful result or outcome.</p><li>
+	<a href="../reference/types/awaitables/generator.html" ><code>generator&lt;T, Executor = void&gt;</code></a>
+<p>A lazily evaluated coroutine generator with Outcome customisation.</p><li>
+	<a href="../reference/types/in_place_type_t.html" ><code>in_place_type_t&lt;T&gt;</code></a>
+<p>Either <code>std::in_place_type_t&lt;T&gt;</code> or a local emulation, depending on the <code>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE</code> macro.</p><li>
+	<a href="../reference/types/awaitables/lazy.html" ><code>lazy&lt;T, Executor = void&gt;/atomic_lazy&lt;T, Executor = void&gt;</code></a>
+<p>A lazily evaluated coroutine awaitable with Outcome customisation.</p><li>
+	<a href="../reference/types/success_type.html" ><code>success_type&lt;T&gt;</code></a>
+<p>Type sugar for constructing a successful result or outcome.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 13, 2018 at 21:10:19 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../reference/policies/throw_bad_result_access.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../reference/types/basic_outcome.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/awaitables/eager.html b/doc/html/reference/types/awaitables/eager.html
new file mode 100644
index 000000000..7c74c6d2c
--- /dev/null
+++ b/doc/html/reference/types/awaitables/eager.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>eager&lt;T, Executor = void&gt;/atomic_eager&lt;T, Executor = void&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/bad_result_access.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/failure_type.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>eager&lt;T, Executor = void&gt;/atomic_eager&lt;T, Executor = void&gt;</code></h1></div></div></div>
+  <p>This is very similar to <a href="../../../reference/types/awaitables/lazy.html" class="api-reference"><code>lazy&lt;T, Executor = void&gt;</code></a>
+, except that execution of the <code>eager&lt;T&gt;</code>
+returning function begins immediately, and if the function never suspends during the
+course of its execution, no suspend-resume cycle occurs. Functions which return <code>eager&lt;T&gt;</code>
+are therefore suitable for tasks which <em>may</em> require suspension, but will often complete
+immediately.</p>
+
+<p><code>atomic_eager&lt;T&gt;</code> is like <code>eager&lt;T&gt;</code>, except that the setting of the coroutine result
+performs an atomic release, whilst the checking of whether the coroutine has finished
+is an atomic acquire.</p>
+
+<p>The <code>Executor</code> template parameter is purely for compatibility with third party software
+such as <a href="https://think-async.com/Asio/">ASIO</a>, and this awaitable can be directly used
+by ASIO.</p>
+
+<p>Example of use (must be called from within a coroutinised function):</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">eager</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">func</span><span class="p">(</span><span class="kt">int</span> <span class="n">x</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="n">co_return</span> <span class="n">x</span> <span class="o">+</span> <span class="mi">1</span><span class="p">;</span>
+<span class="p">}</span>
+<span class="p">...</span>
+<span class="c1">// Executes like a non-coroutine function i.e. r is immediately set to 6.
+</span><span class="c1"></span><span class="kt">int</span> <span class="n">r</span> <span class="o">=</span> <span class="n">co_await</span> <span class="n">func</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span>
+</code></pre></div>
+<p><code>eager&lt;T&gt;</code> has special semantics if <code>T</code> is a type capable of constructing from
+an <code>exception_ptr</code> or <code>error_code</code> &ndash; any exceptions thrown during the function&rsquo;s body
+are sent via <code>T</code>, preferably via the error code route if <a href="../../../reference/functions/error_from_exception.html" class="api-reference"><code>error_from_exception(</code></a>
+<code>)</code>
+successfully matches the exception throw. This means that a
+<a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ or <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+ where one of its types is
+is compatible will have its <code>.error()</code> or <code>.exception()</code> set.</p>
+
+<p>Note that <code>eager&lt;T&gt;</code> does not otherwise transport exception throws, and rethrows
+any exceptions thrown within the coroutine body through the coroutine machinery.
+This does not produce reliable consequences in current C++ compilers. You should
+therefore wrap the coroutine body in a <code>try...catch</code> if <code>T</code> is not able to transport
+exceptions on its own.</p>
+
+<p><em>Requires</em>: C++ coroutines to be available in your compiler.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::awaitables</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/coroutine_support.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: March 18, 2022 at 14:45:32 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/bad_result_access.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/failure_type.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/awaitables/generator.html b/doc/html/reference/types/awaitables/generator.html
new file mode 100644
index 000000000..26cf6721b
--- /dev/null
+++ b/doc/html/reference/types/awaitables/generator.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>generator&lt;T, Executor = void&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/failure_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/in_place_type_t.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>generator&lt;T, Executor = void&gt;</code></h1></div></div></div>
+  <p>This is a classic coroutine generator whereby the coroutine is resumed to calculate
+the next value, and is suspended upon yielding that value. If the value being
+yielded is an Outcome type, special semantics are used if the coroutine throws
+an exception (see below).</p>
+
+<p>The <code>Executor</code> template parameter is purely for compatibility with third party software
+such as <a href="https://think-async.com/Asio/">ASIO</a>, and this awaitable can be directly used
+by ASIO.</p>
+
+<p>Example of use:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">generator</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">func</span><span class="p">(</span><span class="kt">int</span> <span class="n">x</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">while</span><span class="p">(</span><span class="n">x</span> <span class="o">&gt;=</span> <span class="mi">0</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="n">co_yield</span> <span class="n">x</span><span class="o">--</span><span class="p">;</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+<span class="p">...</span>
+<span class="c1">// Creates the coroutine, immediately suspending it.
+</span><span class="c1"></span><span class="k">auto</span> <span class="n">f</span> <span class="o">=</span> <span class="n">func</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span>
+<span class="c1">// If the coroutine has another value to yield ...
+</span><span class="c1"></span><span class="k">while</span><span class="p">(</span><span class="n">f</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="c1">// Get the next value from the coroutine
+</span><span class="c1"></span>  <span class="kt">int</span> <span class="n">r</span> <span class="o">=</span> <span class="n">f</span><span class="p">();</span>
+  <span class="p">...</span>
+<span class="p">}</span>
+</code></pre></div>
+<p><code>generator&lt;T&gt;</code> has special semantics if <code>T</code> is a type capable of constructing from
+an <code>exception_ptr</code> or <code>error_code</code> &ndash; any exceptions thrown during the function&rsquo;s body
+are sent via <code>T</code>, preferably via the error code route if <a href="../../../reference/functions/error_from_exception.html" class="api-reference"><code>error_from_exception(</code></a>
+<code>)</code>
+successfully matches the exception throw. This means that a
+<a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ or <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+ where one of its types is
+is compatible will have its <code>.error()</code> or <code>.exception()</code> set.</p>
+
+<p>Note that <code>generator&lt;T&gt;</code> does not otherwise transport exception throws, and rethrows
+any exceptions thrown within the coroutine body through the coroutine machinery.
+This does not produce reliable consequences in current C++ compilers. You should
+therefore wrap the coroutine body in a <code>try...catch</code> if <code>T</code> is not able to transport
+exceptions on its own.</p>
+
+<p><em>Requires</em>: C++ coroutines to be available in your compiler.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::awaitables</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/coroutine_support.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: March 18, 2022 at 14:45:32 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/failure_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/in_place_type_t.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/awaitables/lazy.html b/doc/html/reference/types/awaitables/lazy.html
new file mode 100644
index 000000000..03d2da9e7
--- /dev/null
+++ b/doc/html/reference/types/awaitables/lazy.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>lazy&lt;T, Executor = void&gt;/atomic_lazy&lt;T, Executor = void&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/in_place_type_t.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/success_type.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>lazy&lt;T, Executor = void&gt;/atomic_lazy&lt;T, Executor = void&gt;</code></h1></div></div></div>
+  <p>This is very similar to <a href="../../../reference/types/awaitables/eager.html" class="api-reference"><code>eager&lt;T, Executor = void&gt;</code></a>
+, except that execution of the
+<code>lazy&lt;T&gt;</code> returning function suspends immediately. Functions which return <code>lazy&lt;T&gt;</code>
+are therefore suitable for tasks which you need to instantiate right now, but whose
+execution will occur elsewhere e.g. in a separate kernel thread. Because of the very
+common use case of using worker threads to execute the body of lazily executed
+coroutines, most people will want to use <code>atomic_lazy&lt;T&gt;</code> instead of <code>lazy&lt;T&gt;</code>.</p>
+
+<p><code>atomic_lazy&lt;T&gt;</code> is like <code>lazy&lt;T&gt;</code>, except that the setting of the coroutine result
+performs an atomic release, whilst the checking of whether the coroutine has finished
+is an atomic acquire.</p>
+
+<p><code>lazy&lt;T&gt;</code> has similar semantics to <code>std::lazy&lt;T&gt;</code>, which is being standardised. See
+<a href="https://wg21.link/P1056">https://wg21.link/P1056</a> <em>Add lazy coroutine (coroutine task) type</em>.</p>
+
+<p>The <code>Executor</code> template parameter is purely for compatibility with third party software
+such as <a href="https://think-async.com/Asio/">ASIO</a>, and this awaitable can be directly used
+by ASIO.</p>
+
+<p>Example of use (must be called from within a coroutinised function):</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">lazy</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">func</span><span class="p">(</span><span class="kt">int</span> <span class="n">x</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="n">co_return</span> <span class="n">x</span> <span class="o">+</span> <span class="mi">1</span><span class="p">;</span>
+<span class="p">}</span>
+<span class="p">...</span>
+<span class="c1">// Always suspends perhaps causing other coroutines to execute, then resumes.
+</span><span class="c1"></span><span class="kt">int</span> <span class="n">r</span> <span class="o">=</span> <span class="n">co_await</span> <span class="n">func</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span>
+</code></pre></div>
+<p><code>lazy&lt;T&gt;</code> has special semantics if <code>T</code> is a type capable of constructing from
+an <code>exception_ptr</code> or <code>error_code</code> &ndash; any exceptions thrown during the function&rsquo;s body
+are sent via <code>T</code>, preferably via the error code route if <a href="../../../reference/functions/error_from_exception.html" class="api-reference"><code>error_from_exception(</code></a>
+<code>)</code>
+successfully matches the exception throw. This means that a
+<a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ or <a href="../../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+ where one of its types is
+is compatible will have its <code>.error()</code> or <code>.exception()</code> set.</p>
+
+<p>Note that <code>lazy&lt;T&gt;</code> does not otherwise transport exception throws, and rethrows
+any exceptions thrown within the coroutine body through the coroutine machinery.
+This does not produce reliable consequences in current C++ compilers. You should
+therefore wrap the coroutine body in a <code>try...catch</code> if <code>T</code> is not able to transport
+exceptions on its own.</p>
+
+<p><em>Requires</em>: C++ coroutines to be available in your compiler.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::awaitables</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/coroutine_support.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: March 18, 2022 at 14:45:32 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/in_place_type_t.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/success_type.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/bad_outcome_access.html b/doc/html/reference/types/bad_outcome_access.html
new file mode 100644
index 000000000..88fccc577
--- /dev/null
+++ b/doc/html/reference/types/bad_outcome_access.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bad_outcome_access - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/basic_result/as_failure_rvalue.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types/bad_result_access_with.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bad_outcome_access</code></h1></div></div></div>
+  <p>Exception type publicly inheriting from 
+<a href="https://en.cppreference.com/w/cpp/error/logic_error" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::logic_error</code></a>
+ indicating an incorrect observation of value or error or exception occurred by <a href="../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
+.</p>
+
+<p>No member functions are added in addition to <code>std::logic_error</code>. Typical <code>.what()</code> strings are:</p>
+
+<ul>
+<li><code>&quot;no value&quot;</code></li>
+<li><code>&quot;no error&quot;</code></li>
+<li><code>&quot;no exception&quot;</code></li>
+</ul>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/bad_access.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 25, 2019 at 01:51:37 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/basic_result/as_failure_rvalue.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types/bad_result_access_with.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/bad_result_access.html b/doc/html/reference/types/bad_result_access.html
new file mode 100644
index 000000000..b8c6cdea8
--- /dev/null
+++ b/doc/html/reference/types/bad_result_access.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bad_result_access - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/bad_result_access_with.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types/awaitables/eager.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bad_result_access</code></h1></div></div></div>
+  <p>Exception type publicly inheriting from 
+<a href="https://en.cppreference.com/w/cpp/error/logic_error" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::logic_error</code></a>
+ indicating an incorrect observation of value or error occurred by <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+.</p>
+
+<p>No member functions are added in addition to <code>std::logic_error</code>. Typical <code>.what()</code> strings are:</p>
+
+<ul>
+<li><code>&quot;no value&quot;</code></li>
+<li><code>&quot;no error&quot;</code></li>
+</ul>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/bad_access.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 25, 2019 at 01:51:37 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/bad_result_access_with.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types/awaitables/eager.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/bad_result_access_with.html b/doc/html/reference/types/bad_result_access_with.html
new file mode 100644
index 000000000..6631a2986
--- /dev/null
+++ b/doc/html/reference/types/bad_result_access_with.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bad_result_access_with&lt;EC&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/bad_outcome_access.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types/bad_result_access.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bad_result_access_with&lt;EC&gt;</code></h1></div></div></div>
+  <p>Exception type publicly inheriting from <a href="../../reference/types/bad_result_access.html" class="api-reference"><code>bad_result_access</code></a>
+, and thus also 
+<a href="https://en.cppreference.com/w/cpp/error/logic_error" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::logic_error</code></a>
+, indicating an incorrect observation of value occurred. The error value at the time of the exception throw is moved or copied into this type, and is available using the <code>.error()</code> observer which comes in lvalue ref, const lvalue ref, rvalue ref, and const rvalue ref overloads.</p>
+
+<p>The primary purpose of this exception type is to enable standing in for 
+<a href="https://wg21.link/P0323" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> P0323 <code>std::expected&lt;T, E&gt;</code></a>
+&rsquo;s <code>bad_expected_access&lt;E&gt;</code> which is thrown on incorrect wide value observation. This is why it is only ever <code>EC</code> which is thrown with <code>bad_result_access_with&lt;EC&gt;</code> on value observation only, and only when there is an error available. See the <a href="../../reference/policies/throw_bad_result_access.html" class="api-reference"><code>throw_bad_result_access&lt;EC&gt;</code></a>
+ policy for more information.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/bad_access.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 25, 2019 at 01:51:37 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/bad_outcome_access.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types/bad_result_access.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome.html b/doc/html/reference/types/basic_outcome.html
new file mode 100644
index 000000000..6f127d427
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome.html
@@ -0,0 +1,511 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/types.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types/basic_outcome/default.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></h1></div></div></div>
+  <div class="toc"><dl class="toc">
+<dt>
+<dd><dl>
+<dt>
+<dd><dl>
+<dt><a href="#design-rationale">Design rationale</a></dt>
+<dt><a href="#public-member-type-aliases">Public member type aliases</a></dt>
+<dt><a href="#protected-member-predicate-booleans">Protected member predicate booleans</a>
+<dd><dl>
+<dt><a href="#summary-of-standard-requirements-provided-https-en-cppreference-com-w-cpp-named-req">Summary of <a href="https://en.cppreference.com/w/cpp/named_req">standard requirements provided</a></a></dt>
+</dl></dd></dt>
+<dt><a href="#public-member-functions">Public member functions</a>
+<dd><dl>
+<dt><a href="#disabling-constructors">Disabling constructors</a></dt>
+</dl></dd></dt>
+</dl></dd></dt>
+</dl></dd></dt>
+</dl>
+  </div>
+
+
+<p>A type carrying one of (i) a successful <code>T</code> (ii) a disappointment <code>EC</code> (iii) a failure <code>EP</code> (iv) both a disappointment <code>EC</code> and a failure <code>EP</code>, with <code>NoValuePolicy</code> specifying what to do if one tries to read state which isn&rsquo;t there, and enabling injection of hooks to trap when lifecycle events occur. Any one, two, or all of <code>T</code>, <code>EC</code> and <code>EP</code> can be <code>void</code> to indicate no value for that state is present. Detectable using <a href="../../reference/traits/is_basic_outcome.html" class="api-reference"><code>is_basic_outcome&lt;T&gt;</code></a>
+.</p>
+
+<p><em>Requires</em>: Concept requirements if C++ 20, else static asserted:</p>
+
+<ul>
+<li>That trait <a href="../../reference/traits/type_can_be_used_in_basic_result.html" class="api-reference"><code>type_can_be_used_in_basic_result&lt;R&gt;</code></a>
+ is true for <code>T</code>, <code>EC</code> and <code>EP</code>.</li>
+<li>That either <code>EC</code> is <code>void</code> or <code>DefaultConstructible</code> (Outcome v2.1 and earlier only).</li>
+<li>That either <code>EP</code> is <code>void</code> or <code>DefaultConstructible</code>.</li>
+</ul>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_outcome.hpp&gt;</code></p>
+
+<p><em>Inclusions</em>: The very lightest weight of C and C++ header files:</p>
+
+<ol>
+<li><code>&lt;cstdint&gt;</code></li>
+<li><code>&lt;initializer_list&gt;</code></li>
+<li><code>&lt;iosfwd&gt;</code></li>
+<li><code>&lt;new&gt;</code></li>
+<li><code>&lt;type_traits&gt;</code></li>
+<li>If <a href="../../reference/macros/in_place_type.html" class="api-reference"><code>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE</code></a>
+ is <code>1</code>, <code>&lt;utility&gt;</code> (defaults to <code>1</code> for C++ 17 or later only)</li>
+<li>If C++ exceptions disabled and <code>BOOST_OUTCOME_DISABLE_EXECINFO</code> undefined only (used to print stack backtraces on &ldquo;exception throw&rdquo;):
+
+<ol>
+<li><code>&lt;sal.h&gt;</code> (Windows only)</li>
+<li><code>&lt;stddef.h&gt;</code> (Windows only)</li>
+<li><code>&lt;string.h&gt;</code> (Windows only)</li>
+<li><code>&lt;execinfo.h&gt;</code> (POSIX only)</li>
+</ol></li>
+<li><code>&lt;cstdio&gt;</code></li>
+<li><code>&lt;cstdlib&gt;</code></li>
+<li><code>&lt;cassert&gt;</code></li>
+</ol>
+
+<p>This very light weight set of inclusion dependencies makes basic outcome suitable for use in global header files of very large C++ codebases.</p>
+
+<h3 id="design-rationale">Design rationale</h3>
+
+<p><code>basic_outcome</code> extends <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ with a third state to transport,
+conventionally (but not necessarily) some sort of &ldquo;abort&rdquo; or &ldquo;exceptional&rdquo; state which a function can
+return to indicate that not only did the operation fail, but it did so <em>catastrophically</em> i.e. please
+abort any attempt to retry the operation.</p>
+
+<p>A perfect alternative is to throw a C++ exception for the abort code path, and indeed most programs
+ought to do exactly that instead of using <code>basic_outcome</code>. However there are a number of use cases
+where choosing <code>basic_outcome</code> shines:</p>
+
+<ol>
+<li>Where C++ exceptions or RTTI is not available, but the ability to fail catastrophically without
+terminating the program is important.</li>
+<li>Where deterministic behaviour is required even in the catastrophic failure situation.</li>
+<li>In unit test suites of code using Outcome it is extremely convenient to accumulate test failures
+into a <code>basic_outcome</code> for later reporting. A similar convenience applies to RPC situations, where
+C++ exception throws need to be accumulated for reporting back to the initiating endpoint.</li>
+<li>Where a function is &ldquo;dual use deterministic&rdquo; i.e. it can be used deterministically, in which case
+one switches control flow based on <code>.error()</code>, or it can be used non-deterministically by throwing
+an exception perhaps carrying a custom payload.</li>
+</ol>
+
+<h3 id="public-member-type-aliases">Public member type aliases</h3>
+
+<ul>
+<li><code>value_type</code> is <code>T</code>.</li>
+<li><code>error_type</code> is <code>EC</code>.</li>
+<li><code>exception_type</code> is <code>EP</code>.</li>
+<li><code>no_value_policy_type</code> is <code>NoValuePolicy</code>.</li>
+<li><code>value_type_if_enabled</code> is <code>T</code> if construction from <code>T</code> is available, else it is a usefully named unusable internal type.</li>
+<li><code>error_type_if_enabled</code> is <code>EC</code> if construction from <code>EC</code> is available, else it is a usefully named unusable internal type.</li>
+<li><code>exception_type_if_enabled</code> is <code>EP</code> if construction from <code>EP</code> is available, else it is a usefully named unusable internal type.</li>
+<li><code>rebind&lt;A, B = EC, C = EP, D = NoValuePolicy&gt;</code> is <code>basic_outcome&lt;A, B, C, D&gt;</code>.</li>
+</ul>
+
+<h3 id="protected-member-predicate-booleans">Protected member predicate booleans</h3>
+
+<ul>
+<li><p><code>predicate::constructors_enabled</code> is constexpr boolean true if:</p>
+
+<ol>
+<li>Decayed <code>value_type</code> and decayed <code>error_type</code> are not the same type, or both are <code>void</code>.</li>
+<li>Decayed <code>value_type</code> and decayed <code>exception_type</code> are not the same type, or both are <code>void</code>.</li>
+<li>Decayed <code>error_type</code> and decayed <code>exception_type</code> are not the same type, or both are <code>void</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::implicit_constructors_enabled</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li>Trait <a href="../../reference/traits/is_error_type.html" class="api-reference"><code>is_error_type&lt;E&gt;</code></a>
+ is not true for both decayed <code>value_type</code> and decayed <code>error_type</code> at the same time.</li>
+<li><code>value_type</code> is not implicitly constructible from <code>error_type</code> and <code>error_type</code> is not implicitly constructible from <code>value_type</code>.<br>OR<br>trait <a href="../../reference/traits/is_error_type.html" class="api-reference"><code>is_error_type&lt;E&gt;</code></a>
+ is true for decayed <code>error_type</code> and <code>error_type</code> is not implicitly constructible from <code>value_type</code> and <code>value_type</code> is an integral type.</li>
+<li><code>value_type</code> is not implicitly constructible from <code>exception_type</code>.</li>
+<li><code>error_type</code> is not implicitly constructible from <code>exception_type</code>.</li>
+<li><code>exception_type</code> is not implicitly constructible from <code>value_type</code>.</li>
+<li><code>exception_type</code> is not implicitly constructible from <code>error_type</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_value_converting_constructor&lt;A&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not this <code>basic_outcome</code> type.</li>
+<li><code>predicate::implicit_constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not an <code>in_place_type_t</code>.</li>
+<li>Trait <a href="../../reference/traits/is_error_type_enum.html" class="api-reference"><code>is_error_type_enum&lt;E, Enum&gt;</code></a>
+ is false for <code>error_type</code> and decayed <code>A</code>.</li>
+<li><code>value_type</code> is implicitly constructible from <code>A</code> and <code>error_type</code> is not implicitly constructible from <code>A</code>.<br>OR<br><code>value_type</code> is the exact same type as decayed <code>A</code> and <code>value_type</code> is implicitly constructible from <code>A</code>.</li>
+<li><code>exception_type</code> is not implicitly constructible from <code>A</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_error_converting_constructor&lt;A&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not this <code>basic_outcome</code> type.</li>
+<li><code>predicate::implicit_constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not an <code>in_place_type_t</code>.</li>
+<li>Trait <a href="../../reference/traits/is_error_type_enum.html" class="api-reference"><code>is_error_type_enum&lt;E, Enum&gt;</code></a>
+ is false for <code>error_type</code> and decayed <code>A</code>.</li>
+<li><code>value_type</code> is not implicitly constructible from <code>A</code> and <code>error_type</code> is implicitly constructible from <code>A</code>.<br>OR<br><code>error_type</code> is the exact same type as decayed <code>A</code> and <code>error_type</code> is implicitly constructible from <code>A</code>.</li>
+<li><code>exception_type</code> is not implicitly constructible from <code>A</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_error_condition_converting_constructor&lt;ErrorCondEnum&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li>Decayed <code>ErrorCondEnum</code> is not this <code>basic_outcome</code> type.</li>
+<li>Decayed <code>ErrorCondEnum</code> is not an <code>in_place_type_t</code>.</li>
+<li>Trait <a href="../../reference/traits/is_error_type_enum.html" class="api-reference"><code>is_error_type_enum&lt;E, Enum&gt;</code></a>
+ is true for <code>error_type</code> and decayed <code>ErrorCondEnum</code>.</li>
+<li><code>exception_type</code> is not implicitly constructible from <code>ErrorCondEnum</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_exception_converting_constructor&lt;A&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not this <code>basic_outcome</code> type.</li>
+<li><code>predicate::implicit_constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not an <code>in_place_type_t</code>.</li>
+<li><code>value_type</code> is not implicitly constructible from <code>A</code>.</li>
+<li><code>error_type</code> is not implicitly constructible from <code>A</code>.</li>
+<li><code>exception_type</code> is implicitly constructible from <code>A</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_error_exception_converting_constructor&lt;A, B&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not this <code>basic_outcome</code> type.</li>
+<li><code>predicate::implicit_constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not an <code>in_place_type_t</code>.</li>
+<li><code>value_type</code> is not implicitly constructible from <code>A</code>.</li>
+<li><code>error_type</code> is implicitly constructible from <code>A</code>.</li>
+<li><code>value_type</code> is not implicitly constructible from <code>B</code>.</li>
+<li><code>exception_type</code> is implicitly constructible from <code>B</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_compatible_conversion&lt;A, B, C, D&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>basic_outcome&lt;A, B, C, D&gt;</code> is not this <code>basic_outcome</code> type.</li>
+<li><code>A</code> is <code>void</code> OR <code>value_type</code> is explicitly constructible from <code>A</code>.</li>
+<li><code>B</code> is <code>void</code> OR <code>error_type</code> is explicitly constructible from <code>B</code>.</li>
+<li><code>C</code> is <code>void</code> OR <code>exception_type</code> is explicitly constructible from <code>C</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_make_error_code_compatible_conversion&lt;A, B, C, D&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>basic_outcome&lt;A, B, C, D&gt;</code> is not this <code>basic_outcome</code> type.</li>
+<li>Trait <a href="../../reference/traits/is_error_code_available.html" class="api-reference"><code>is_error_code_available&lt;T&gt;</code></a>
+ is true for decayed <code>error_type</code>.</li>
+<li><code>predicate::enable_compatible_conversion&lt;A, B, C, D&gt;</code> is not true.</li>
+<li><code>A</code> is <code>void</code> OR <code>value_type</code> is explicitly constructible from <code>A</code>.</li>
+<li><code>error_type</code> is explicitly constructible from <code>make_error_code(B)</code>.</li>
+<li><code>C</code> is <code>void</code> OR <code>exception_type</code> is explicitly constructible from <code>C</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_inplace_value_constructor&lt;Args...&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>value_type</code> is <code>void</code> OR <code>value_type</code> is explicitly constructible from <code>Args...</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_inplace_error_constructor&lt;Args...&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>error_type</code> is <code>void</code> OR <code>error_type</code> is explicitly constructible from <code>Args...</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_inplace_exception_constructor&lt;Args...&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>exception_type</code> is <code>void</code> OR <code>exception_type</code> is explicitly constructible from <code>Args...</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_inplace_value_error_exception_constructor&lt;Args...&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>predicate::implicit_constructors_enabled</code> is true.</li>
+<li>Exactly one of <code>value_type</code> is explicitly constructible from <code>Args...</code>, or <code>error_type</code> is explicitly constructible from <code>Args...</code>, or <code>exception_type</code> is explicitly constructible
+from <code>Args...</code>.</li>
+</ol></li>
+</ul>
+
+<h4 id="summary-of-standard-requirements-provided-https-en-cppreference-com-w-cpp-named-req">Summary of <a href="https://en.cppreference.com/w/cpp/named_req">standard requirements provided</a></h4>
+
+<ul>
+<li><del><code>DefaultConstructible</code></del>, always deleted to force user to choose valued or errored or excepted for every outcome instanced.</li>
+<li><code>MoveConstructible</code>, if all of <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> implement move constructors.</li>
+<li><code>CopyConstructible</code>, if all of <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> implement copy constructors.</li>
+<li><code>MoveAssignable</code>, if all of <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> implement move constructors and move assignment.</li>
+<li><code>CopyAssignable</code>, if all of <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> implement copy constructors and copy assignment.</li>
+<li><code>Destructible</code>.</li>
+<li><code>Swappable</code>, with the strong rather than weak guarantee. See <a href="../../reference/types/basic_outcome/swap.html" class="api-reference"><code>void swap(basic_outcome &amp;)</code></a>
+ for more information.</li>
+<li><code>TriviallyCopyable</code>, if all of <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> are trivially copyable.</li>
+<li><code>TrivialType</code>, if all of <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> are trivial types.</li>
+<li><code>LiteralType</code>, if all of <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> are literal types.</li>
+
+<li><p><del><code>StandardLayoutType</code></del>. It is implementation defined if <code>basic_outcome</code> can be used by C.
+However all of the three major compilers MSVC, GCC and clang implement C layout of <code>basic_outcome</code> as follows:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">struct</span> <span class="n">outcome_layout</span> <span class="p">{</span>
+  <span class="k">struct</span> <span class="n">trivially_copyable_result_layout</span> <span class="p">{</span>
+    <span class="k">union</span> <span class="p">{</span>
+      <span class="n">value_type</span> <span class="n">value</span><span class="p">;</span>
+      <span class="n">error_type</span> <span class="n">error</span><span class="p">;</span>
+    <span class="p">};</span>
+    <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+  <span class="p">};</span>
+  <span class="n">exception_type</span> <span class="n">exception</span><span class="p">;</span>
+<span class="p">};</span>
+</code></pre></div>
+<p>&hellip; if both <code>value_type</code> and <code>error_type</code> are <code>TriviallyCopyable</code>, otherwise:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">struct</span> <span class="n">outcome_layout</span> <span class="p">{</span>
+  <span class="k">struct</span> <span class="n">non_trivially_copyable_result_layout</span> <span class="p">{</span>
+    <span class="n">value_type</span> <span class="n">value</span><span class="p">;</span>
+    <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+    <span class="n">error_type</span> <span class="n">error</span><span class="p">;</span>
+  <span class="p">};</span>
+  <span class="n">exception_type</span> <span class="n">exception</span><span class="p">;</span>
+<span class="p">};</span>
+</code></pre></div>
+<p>If you choose standard layout <code>value_type</code>, <code>error_type</code> and <code>exception_type</code>, <code>basic_outcome</code>
+works fine from C on MSVC, GCC and clang.</p></li>
+
+<li><p><code>EqualityComparable</code>, if all of <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> implement equality comparisons with one another.</p></li>
+
+<li><p><del><code>LessThanComparable</code></del>, not implemented due to availability of implicit conversions from <code>value_type</code>, <code>error_type</code> and <code>exception_type</code>, this can cause major surprise (i.e. hard to diagnose bugs), so we don&rsquo;t implement these at all.</p></li>
+
+<li><p><del><code>Hash</code></del>, not implemented as a generic implementation of a unique hash for non-valued items which are unequal would require a dependency on RTTI being enabled.</p></li>
+</ul>
+
+<p>Thus <code>basic_outcome</code> meets the <code>Regular</code> concept if all of <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> are <code>Regular</code>, except for the lack of a default constructor. Often where one needs a default constructor, wrapping <code>basic_outcome</code> into 
+<a href="https://en.cppreference.com/w/cpp/utility/optional" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::optional&lt;T&gt;</code></a>
+ will suffice.</p>
+
+<h3 id="public-member-functions">Public member functions</h3>
+
+<h4 id="disabling-constructors">Disabling constructors</h4>
+
+<ol class="children children-li"><li>
+	<a href="../../reference/types/basic_outcome/disabling_catchall.html" ><code>basic_outcome(Args...) = delete</code></a>
+<p>Disabling catchall constructor used to give useful diagnostic error when trying to use non-inplace constructors when <code>predicate::constructors_enabled</code> is false.</p><li>
+	<a href="../../reference/types/basic_outcome/disabling_implicit_constructor.html" ><code>basic_outcome(X &amp;&amp;) = delete</code></a>
+<p>Disabling implicit constructor used to give useful diagnostic error when trying to use implicit constructors when <code>predicate::implicit_constructors_enabled</code> is false.</p></li></ol>
+
+<h4 id="copy-and-move-constructors-and-assignment-and-destructor">Copy and move constructors and assignment, and destructor</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_outcome/default.html" ><code>basic_outcome() = delete</code></a>
+<p>The default constructor (disabled).</p><li>
+    <a href="../../reference/types/basic_outcome/move_constructor.html" ><code>basic_outcome(basic_outcome &amp;&amp;)</code></a>
+<p>Move constructor. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/copy_constructor.html" ><code>basic_outcome(const basic_outcome &amp;)</code></a>
+<p>Copy constructor. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/move_assignment.html" ><code>basic_outcome &amp;operator=(basic_outcome &amp;&amp;)</code></a>
+<p>Move assignment. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/copy_assignment.html" ><code>basic_outcome &amp;operator=(const basic_outcome &amp;)</code></a>
+<p>Copy assignment. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/destructor.html" ><code>~basic_outcome()</code></a>
+<p>Destructor. Constexpr, triviality and noexcept propagating.</p></li></ol>
+
+<h4 id="converting-constructors">Converting constructors</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_outcome/implicit_value_converting_constructor.html" ><code>basic_outcome(R &amp;&amp;)</code></a>
+<p>Implicit <code>value_type</code> constructor. Available if <code>predicate::enable_value_converting_constructor&lt;R&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_error_converting_constructor.html" ><code>basic_outcome(S &amp;&amp;)</code></a>
+<p>Implicit <code>error_type</code> constructor. Available if <code>predicate::enable_error_converting_constructor&lt;S&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_error_condition_converting_constructor.html" ><code>basic_outcome(ErrorCondEnum &amp;&amp;)</code></a>
+<p>Implicit <code>error_type</code> from <code>ErrorCondEnum</code> constructor. Available if <code>predicate::enable_error_condition_converting_constructor&lt;ErrorCondEnum&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_exception_converting_constructor.html" ><code>basic_outcome(P &amp;&amp;)</code></a>
+<p>Implicit <code>exception_type</code> constructor. Available if <code>predicate::enable_exception_converting_constructor&lt;P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_error_exception_converting_constructor.html" ><code>basic_outcome(S &amp;&amp;, P &amp;&amp;)</code></a>
+<p>Implicit <code>error_type</code> + <code>exception_type</code> constructor. Available if <code>predicate::enable_error_exception_converting_constructor&lt;S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html" ><code>explicit basic_outcome(concepts::value_or_error&lt;T, E&gt; &amp;&amp;)</code></a>
+<p>Explicit converting constructor from <code>concepts::value_or_error&lt;T, E&gt;</code> concept matching types. Available if <code>convert::value_or_error&lt;&gt;</code> permits it. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_copy_converting_constructor.html" ><code>explicit basic_outcome(const basic_outcome&lt;A, B, C, D&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_outcome</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, C, D&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_move_converting_constructor.html" ><code>explicit basic_outcome(basic_outcome&lt;A, B, C, D&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_outcome</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, C, D&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_result_copy_converting_constructor.html" ><code>explicit basic_outcome(const basic_result&lt;A, B, C&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_result_move_converting_constructor.html" ><code>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_result_make_error_code_copy_converting_constructor.html" ><code>explicit basic_outcome(const basic_result&lt;A, B, C&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_result_make_error_code_move_converting_constructor.html" ><code>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p></li></ol>
+
+<h4 id="inplace-constructors">Inplace constructors</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_outcome/explicit_inplace_value_constructor.html" ><code>explicit basic_outcome(in_place_type_t&lt;value_type_if_enabled&gt;, Args ...)</code></a>
+<p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_inplace_value_constructor_il.html" ><code>explicit basic_outcome(in_place_type_t&lt;value_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
+<p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_inplace_error_constructor.html" ><code>explicit basic_outcome(in_place_type_t&lt;error_type_if_enabled&gt;, Args ...)</code></a>
+<p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_inplace_error_constructor_il.html" ><code>explicit basic_outcome(in_place_type_t&lt;error_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
+<p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_inplace_exception_constructor.html" ><code>explicit basic_outcome(in_place_type_t&lt;exception_type_if_enabled&gt;, Args ...)</code></a>
+<p>Explicit inplace exception constructor. Available if <code>predicate::enable_inplace_exception_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/explicit_inplace_exception_constructor_il.html" ><code>explicit basic_outcome(in_place_type_t&lt;exception_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
+<p>Explicit inplace exception constructor. Available if <code>predicate::enable_inplace_exception_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_inplace_value_error_exception_constructor.html" ><code>basic_outcome(A1 &amp;&amp;, A2 &amp;&amp;, Args ...)</code></a>
+<p>Implicit inplace value or error or exception constructor. Available if <code>predicate::enable_inplace_value_error_exception_constructor&lt;A1, A2, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p></li></ol>
+
+<h4 id="tagged-constructors">Tagged constructors</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_outcome/implicit_success_copy_constructor.html" ><code>basic_outcome(const success_type&lt;T&gt; &amp;)</code></a>
+<p>Implicit value-from-success-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_success_move_constructor.html" ><code>basic_outcome(success_type&lt;T&gt; &amp;&amp;)</code></a>
+<p>Implicit value-from-success-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_failure_error_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EC&gt; &amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_failure_error_move_constructor.html" ><code>basic_outcome(failure_type&lt;EC&gt; &amp;&amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_failure_error_make_error_code_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EC&gt; &amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_failure_error_make_error_code_move_constructor.html" ><code>basic_outcome(failure_type&lt;EC&gt; &amp;&amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_failure_exception_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EP&gt; &amp;)</code></a>
+<p>Implicit exception-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, void, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_failure_exception_move_constructor.html" ><code>basic_outcome(failure_type&lt;EP&gt; &amp;&amp;)</code></a>
+<p>Implicit exception-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, void, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_failure_error_exception_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EC, EP&gt; &amp;)</code></a>
+<p>Implicit error-and-exception-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/implicit_failure_error_exception_move_constructor.html" ><code>basic_outcome(failure_type&lt;EC, EP&gt; &amp;&amp;)</code></a>
+<p>Implicit error-and-exception-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p></li></ol>
+
+<h4 id="observers">Observers</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_outcome/operator_bool.html" ><code>explicit operator bool() const noexcept</code></a>
+<p>Returns true if a value is present. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/has_value.html" ><code>bool has_value() const noexcept</code></a>
+<p>Returns true if a value is present. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/has_error.html" ><code>bool has_error() const noexcept</code></a>
+<p>Returns true if an error is present. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/has_exception.html" ><code>bool has_exception() const noexcept</code></a>
+<p>Returns true if an exception is present. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/has_failure.html" ><code>bool has_failure() const noexcept</code></a>
+<p>Returns true if there is either an error or an exception. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_value_lvalue.html" ><code>value_type &amp;assume_value() &amp; noexcept</code></a>
+<p>Narrow contract lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_value_lvalue_const.html" ><code>const value_type &amp;assume_value() const &amp; noexcept</code></a>
+<p>Narrow contract const lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_value_rvalue.html" ><code>value_type &amp;&amp;assume_value() &amp;&amp; noexcept</code></a>
+<p>Narrow contract rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_value_rvalue_const.html" ><code>const value_type &amp;&amp;assume_value() const &amp;&amp; noexcept</code></a>
+<p>Narrow contract const rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/value_lvalue.html" ><code>value_type &amp;value() &amp;</code></a>
+<p>Wide contract lvalue reference observer of any value present. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/value_lvalue_const.html" ><code>const value_type &amp;value() const &amp;</code></a>
+<p>Wide contract const lvalue reference observer of any value present. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/value_rvalue.html" ><code>value_type &amp;&amp;value() &amp;&amp;</code></a>
+<p>Wide contract rvalue reference observer of any value present. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/value_rvalue_const.html" ><code>const value_type &amp;&amp;value() const &amp;&amp;</code></a>
+<p>Wide contract const rvalue reference observer of any value present. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_error_lvalue.html" ><code>error_type &amp;assume_error() &amp; noexcept</code></a>
+<p>Narrow contract lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_error_lvalue_const.html" ><code>const error_type &amp;assume_error() const &amp; noexcept</code></a>
+<p>Narrow contract const lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_error_rvalue.html" ><code>error_type &amp;&amp;assume_error() &amp;&amp; noexcept</code></a>
+<p>Narrow contract rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_error_rvalue_const.html" ><code>const error_type &amp;&amp;assume_error() const &amp;&amp; noexcept</code></a>
+<p>Narrow contract const rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/error_lvalue.html" ><code>error_type &amp;error() &amp;</code></a>
+<p>Wide contract lvalue reference observer of the stored error. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/error_lvalue_const.html" ><code>const error_type &amp;error() const &amp;</code></a>
+<p>Wide contract const lvalue reference observer of the stored error. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/error_rvalue.html" ><code>error_type &amp;&amp;error() &amp;&amp;</code></a>
+<p>Wide contract rvalue reference observer of the stored error. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/error_rvalue_const.html" ><code>const error_type &amp;&amp;error() const &amp;&amp;</code></a>
+<p>Wide contract const rvalue reference observer of the stored error. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_exception_lvalue.html" ><code>exception_type &amp;assume_exception() &amp; noexcept</code></a>
+<p>Narrow contract lvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_exception_lvalue_const.html" ><code>const exception_type &amp;assume_exception() const &amp; noexcept</code></a>
+<p>Narrow contract const lvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_exception_rvalue_const.html" ><code>const exception_type &amp;&amp;assume_exception() const &amp;&amp; noexcept</code></a>
+<p>Narrow contract const rvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/assume_exception_rvalue.html" ><code>exception_type &amp;&amp;assume_exception() &amp;&amp; noexcept</code></a>
+<p>Narrow contract rvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/exception_lvalue.html" ><code>exception_type &amp;exception() &amp;</code></a>
+<p>Wide contract lvalue reference observer of the stored exception. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/exception_lvalue_const.html" ><code>const exception_type &amp;exception() const &amp;</code></a>
+<p>Wide contract const lvalue reference observer of the stored exception. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/exception_rvalue.html" ><code>exception_type &amp;&amp;exception() &amp;&amp;</code></a>
+<p>Wide contract rvalue reference observer of the stored exception. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/exception_rvalue_const.html" ><code>const exception_type &amp;&amp;exception() const &amp;&amp;</code></a>
+<p>Wide contract const rvalue reference observer of the stored exception. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/failure.html" ><code>exception_type failure() const noexcept</code></a>
+<p>Synthesising observer of the stored exception or error. Available if the traits <code>is_error_code_available&lt;T&gt;</code> and <code>is_exception_ptr_available&lt;T&gt;</code> are both true. Never throws.</p><li>
+    <a href="../../reference/types/basic_outcome/as_failure_lvalue.html" ><code>failure_type&lt;error_type, exception_type&gt; as_failure() const &amp;</code></a>
+<p>Return the output from free function <code>failure()</code> containing a copy of any errored and/or excepted state.</p></li></ol>
+
+<h4 id="modifiers">Modifiers</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_outcome/swap.html" ><code>void swap(basic_outcome &amp;)</code></a>
+<p>Swap one basic_outcome with another, with the strong guarantee. Noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/as_failure_rvalue.html" ><code>failure_type&lt;error_type, exception_type&gt; as_failure() &amp;&amp;</code></a>
+<p>Return the output from free function <code>failure()</code> containing a move of any errored and/or excepted state.</p></li></ol>
+
+<h4 id="comparisons">Comparisons</h4>
+
+<p>See above for why <code>LessThanComparable</code> is not implemented.</p>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_outcome/equality_basic_result.html" ><code>bool operator==(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
+<p>Returns true if this outcome compares equal to the other result. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/equality_basic_outcome.html" ><code>bool operator==(const basic_outcome&lt;A, B, C, D&gt; &amp;) const</code></a>
+<p>Returns true if this outcome compares equal to the other outcome. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/inequality_success_type.html" ><code>bool operator==(const success_type&lt;A&gt; &amp;) const</code></a>
+<p>Returns true if this result compares equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/equality_failure_type.html" ><code>bool operator==(const failure_type&lt;A, B&gt; &amp;) const</code></a>
+<p>Returns true if this outcome compares equal to the failure type sugar. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/inequality_basic_result.html" ><code>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
+<p>Returns true if this outcome does not compare equal to the other result. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/inequality_basic_outcome.html" ><code>bool operator!=(const basic_outcome&lt;A, B, C, D&gt; &amp;) const</code></a>
+<p>Returns true if this outcome does not compare equal to the other outcome. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/equality_success_type.html" ><code>bool operator!=(const success_type&lt;A&gt; &amp;) const</code></a>
+<p>Returns true if this outcome does not compare equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_outcome/inequality_failure_type.html" ><code>bool operator!=(const failure_type&lt;A, B&gt; &amp;) const</code></a>
+<p>Returns true if this outcome does not compare equal to the failure type sugar. Constexpr and noexcept propagating.</p></li></ol>
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/types.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types/basic_outcome/default.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/as_failure_lvalue.html b/doc/html/reference/types/basic_outcome/as_failure_lvalue.html
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+++ b/doc/html/reference/types/basic_outcome/as_failure_lvalue.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>failure_type&lt;error_type, exception_type&gt; as_failure() const &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/swap.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/as_failure_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>failure_type&lt;error_type, exception_type&gt; as_failure() const &amp;</code></h1></div></div></div>
+  <p>Return the output from free function <a href="../../../reference/functions/failure.html" class="api-reference"><code>auto failure(T &amp;&amp;, ...)</code></a>
+ containing a copy of any errored and/or excepted state. The error and/or exception state is accessed using <a href="../../../reference/types/basic_outcome/assume_error_lvalue_const.html" class="api-reference"><code>const error_type &amp;assume_error() const &amp; noexcept</code></a>
+ and <a href="../../../reference/types/basic_outcome/assume_exception_lvalue_const.html" class="api-reference"><code>const exception_type &amp;assume_exception() const &amp; noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Whatever that of <code>error_type</code>&rsquo;s and/or <code>exception_type</code>&rsquo;s copy constructor is.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 15:52:57 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/swap.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/as_failure_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/as_failure_rvalue.html b/doc/html/reference/types/basic_outcome/as_failure_rvalue.html
new file mode 100644
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+++ b/doc/html/reference/types/basic_outcome/as_failure_rvalue.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>failure_type&lt;error_type, exception_type&gt; as_failure() &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/as_failure_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>failure_type&lt;error_type, exception_type&gt; as_failure() &amp;&amp;</code></h1></div></div></div>
+  <p>Return the output from free function <a href="../../../reference/functions/failure.html" class="api-reference"><code>auto failure(T &amp;&amp;, ...)</code></a>
+ containing a move from any errored and/or excepted state, thus leaving the outcome&rsquo;s error and exception values in a moved-from state. Depending on the choice of <code>error_type</code> and/or <code>exception_type</code>, this function may therefore be destructive. The error and exception states are accessed using <a href="../../../reference/types/basic_outcome/assume_error_rvalue.html" class="api-reference"><code>error_type &amp;&amp;assume_error() &amp;&amp; noexcept</code></a>
+ and <a href="../../../reference/types/basic_outcome/assume_exception_rvalue.html" class="api-reference"><code>exception_type &amp;&amp;assume_exception() &amp;&amp; noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Whatever that of <code>error_type</code>&rsquo;s and/or <code>exception_type</code>&rsquo;s move constructor is.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 15:52:57 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/as_failure_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_error_lvalue.html b/doc/html/reference/types/basic_outcome/assume_error_lvalue.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/assume_error_lvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>error_type &amp;assume_error() &amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/value_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_error_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>error_type &amp;assume_error() &amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract lvalue reference observer of the stored error. <code>NoValuePolicy::narrow_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_error_check()</code> does that.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/value_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_error_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_error_lvalue_const.html b/doc/html/reference/types/basic_outcome/assume_error_lvalue_const.html
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/assume_error_lvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const error_type &amp;assume_error() const &amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_error_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_error_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const error_type &amp;assume_error() const &amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract const lvalue reference observer of the stored error. <code>NoValuePolicy::narrow_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_error_check()</code> does that.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_error_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_error_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_error_rvalue.html b/doc/html/reference/types/basic_outcome/assume_error_rvalue.html
new file mode 100644
index 000000000..81fd2dddd
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/assume_error_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>error_type &amp;&amp;assume_error() &amp;&amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_error_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_error_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>error_type &amp;&amp;assume_error() &amp;&amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract rvalue reference observer of the stored error. <code>NoValuePolicy::narrow_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_error_check()</code> does that.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_error_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_error_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_error_rvalue_const.html b/doc/html/reference/types/basic_outcome/assume_error_rvalue_const.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/assume_error_rvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const error_type &amp;&amp;assume_error() const &amp;&amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_error_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/error_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const error_type &amp;&amp;assume_error() const &amp;&amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract const rvalue reference observer of the stored error. <code>NoValuePolicy::narrow_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_error_check()</code> does that.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_error_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/error_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_exception_lvalue.html b/doc/html/reference/types/basic_outcome/assume_exception_lvalue.html
new file mode 100644
index 000000000..239837fa5
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/assume_exception_lvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>exception_type &amp;assume_exception() &amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/error_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_exception_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>exception_type &amp;assume_exception() &amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract lvalue reference observer of the stored exception. <code>NoValuePolicy::narrow_exception_check()</code> is first invoked, then the reference to the exception is returned. As a valid default constructed exception is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_exception_check()</code> does that.</p>
+
+<p>Note that if <code>exception_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_exception_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/error_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_exception_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_exception_lvalue_const.html b/doc/html/reference/types/basic_outcome/assume_exception_lvalue_const.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/assume_exception_lvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const exception_type &amp;assume_exception() const &amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_exception_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_exception_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const exception_type &amp;assume_exception() const &amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract const lvalue reference observer of the stored exception. <code>NoValuePolicy::narrow_exception_check()</code> is first invoked, then the reference to the exception is returned. As a valid default constructed exception is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_exception_check()</code> does that.</p>
+
+<p>Note that if <code>exception_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_exception_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_exception_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_exception_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_exception_rvalue.html b/doc/html/reference/types/basic_outcome/assume_exception_rvalue.html
new file mode 100644
index 000000000..038385d44
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/assume_exception_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>exception_type &amp;&amp;assume_exception() &amp;&amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_exception_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/exception_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>exception_type &amp;&amp;assume_exception() &amp;&amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract rvalue reference observer of the stored exception. <code>NoValuePolicy::narrow_exception_check()</code> is first invoked, then the reference to the exception is returned. As a valid default constructed exception is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_exception_check()</code> does that.</p>
+
+<p>Note that if <code>exception_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_exception_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_exception_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/exception_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
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diff --git a/doc/html/reference/types/basic_outcome/assume_exception_rvalue_const.html b/doc/html/reference/types/basic_outcome/assume_exception_rvalue_const.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const exception_type &amp;&amp;assume_exception() const &amp;&amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_exception_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_exception_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const exception_type &amp;&amp;assume_exception() const &amp;&amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract const rvalue reference observer of the stored exception. <code>NoValuePolicy::narrow_exception_check()</code> is first invoked, then the reference to the exception is returned. As a valid default constructed exception is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_exception_check()</code> does that.</p>
+
+<p>Note that if <code>exception_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_exception_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_exception_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_exception_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_value_lvalue.html b/doc/html/reference/types/basic_outcome/assume_value_lvalue.html
new file mode 100644
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+++ b/doc/html/reference/types/basic_outcome/assume_value_lvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_type &amp;assume_value() &amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/has_failure.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_value_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_type &amp;assume_value() &amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract lvalue reference observer of any value present. <code>NoValuePolicy::narrow_value_check()</code> is first invoked, then the reference to the value is returned. The convention is that hard undefined behaviour occurs if no value is actually present, however <code>NoValuePolicy::narrow_value_check()</code> can do something to avoid that.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/has_failure.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_value_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_value_lvalue_const.html b/doc/html/reference/types/basic_outcome/assume_value_lvalue_const.html
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+++ b/doc/html/reference/types/basic_outcome/assume_value_lvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const value_type &amp;assume_value() const &amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_value_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_value_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const value_type &amp;assume_value() const &amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract const lvalue reference observer of any value present. <code>NoValuePolicy::narrow_value_check()</code> is first invoked, then the reference to the value is returned. The convention is that hard undefined behaviour occurs if no value is actually present, however <code>NoValuePolicy::narrow_value_check()</code> can do something to avoid that.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_value_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_value_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_value_rvalue.html b/doc/html/reference/types/basic_outcome/assume_value_rvalue.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/assume_value_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_type &amp;&amp;assume_value() &amp;&amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_value_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_value_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_type &amp;&amp;assume_value() &amp;&amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract rvalue reference observer of any value present. <code>NoValuePolicy::narrow_value_check()</code> is first invoked, then the reference to the value is returned. The convention is that hard undefined behaviour occurs if no value is actually present, however <code>NoValuePolicy::narrow_value_check()</code> can do something to avoid that.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_value_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_value_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/assume_value_rvalue_const.html b/doc/html/reference/types/basic_outcome/assume_value_rvalue_const.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/assume_value_rvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const value_type &amp;&amp;assume_value() const &amp;&amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_value_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/value_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const value_type &amp;&amp;assume_value() const &amp;&amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract const rvalue reference observer of any value present. <code>NoValuePolicy::narrow_value_check()</code> is first invoked, then the reference to the value is returned. The convention is that hard undefined behaviour occurs if no value is actually present, however <code>NoValuePolicy::narrow_value_check()</code> can do something to avoid that.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_value_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/value_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/copy_assignment.html b/doc/html/reference/types/basic_outcome/copy_assignment.html
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+++ b/doc/html/reference/types/basic_outcome/copy_assignment.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome &amp;operator=(const basic_outcome &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/move_assignment.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/destructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome &amp;operator=(const basic_outcome &amp;)</code></h1></div></div></div>
+  <p>Copy assignment.</p>
+
+<p><em>Requires</em>: that <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> all implement copy assignment.</p>
+
+<p><em>Complexity</em>: If the <code>value_type</code> for both is present, uses <code>value_type</code>&rsquo;s copy assignment operator, else either destructs or copy constructs <code>value_type</code> as appropriate. <code>error_type</code>&rsquo;s and <code>exception_type</code>&rsquo;s copy assignment operator is always used. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/move_assignment.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/destructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/copy_constructor.html b/doc/html/reference/types/basic_outcome/copy_constructor.html
new file mode 100644
index 000000000..09e1de5dc
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+++ b/doc/html/reference/types/basic_outcome/copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(const basic_outcome &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/move_assignment.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(const basic_outcome &amp;)</code></h1></div></div></div>
+  <p>Copy constructor.</p>
+
+<p><em>Requires</em>: that <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> all implement a copy constructor.</p>
+
+<p><em>Complexity</em>: Same as for <code>value_type</code>&rsquo;s, <code>error_type</code>&rsquo;s and <code>exception_type</code>&rsquo;s copy constructors. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/move_assignment.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/default.html b/doc/html/reference/types/basic_outcome/default.html
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+++ b/doc/html/reference/types/basic_outcome/default.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome() = delete - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome() = delete</code></h1></div></div></div>
+  <p>The default constructor for basic outcome is always disabled.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/types/basic_outcome/destructor.html b/doc/html/reference/types/basic_outcome/destructor.html
new file mode 100644
index 000000000..9ce886db7
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+++ b/doc/html/reference/types/basic_outcome/destructor.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>~basic_outcome() - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/copy_assignment.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/disabling_catchall.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>~basic_outcome()</code></h1></div></div></div>
+  <p>Destructor.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Same as for <code>value_type</code>&rsquo;s, <code>error_type</code>&rsquo;s and <code>exception_type</code>&rsquo;s destructors. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/copy_assignment.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/disabling_catchall.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/disabling_catchall.html b/doc/html/reference/types/basic_outcome/disabling_catchall.html
new file mode 100644
index 000000000..e128634f5
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+++ b/doc/html/reference/types/basic_outcome/disabling_catchall.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(Args&hellip;) = delete - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/destructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/disabling_implicit_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(Args...) = delete</code></h1></div></div></div>
+  <p>Disabling catchall constructor used to give useful diagnostic error when trying to use non-inplace constructors when <code>predicate::constructors_enabled</code> is false.</p>
+
+<p><em>Requires</em>: <code>predicate::constructors_enabled</code> is false.</p>
+
+<p><em>Complexity</em>: N/A.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/destructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/disabling_implicit_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/disabling_implicit_constructor.html b/doc/html/reference/types/basic_outcome/disabling_implicit_constructor.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/disabling_implicit_constructor.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(X &amp;&amp;) = delete - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/disabling_catchall.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_value_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(X &amp;&amp;) = delete</code></h1></div></div></div>
+  <p>Disabling implicit constructor used to give useful diagnostic error when trying to use implicit constructors when <code>predicate::implicit_constructors_enabled</code> is false.</p>
+
+<p><em>Requires</em>: <code>predicate::implicit_constructors_enabled</code> is false.</p>
+
+<p><em>Complexity</em>: N/A.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/disabling_catchall.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_value_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/equality_basic_outcome.html b/doc/html/reference/types/basic_outcome/equality_basic_outcome.html
new file mode 100644
index 000000000..cc2e8a39e
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/equality_basic_outcome.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator==(const basic_outcome&lt;A, B, C, D&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/equality_basic_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/inequality_success_type.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator==(const basic_outcome&lt;A, B, C, D&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this outcome compares equal to the other outcome. Comparison is done using <code>operator==</code> on  <code>value_type</code> or <code>error_type</code> and/or <code>exception_type</code> if the currently chosen state is the same for both outcomes, otherwise false is returned.</p>
+
+<p><em>Requires</em>: <code>operator==</code> must be a valid expression between <code>value_type</code> and <code>A</code>, and between <code>error_type</code> and <code>B</code>, and between <code>exception_type</code> and <code>C</code>. If <code>value_type</code> is <code>void</code>, then so must be <code>A</code>; similarly for <code>error_type</code> and <code>B</code>; similarly for <code>exception_type</code> and <code>C</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator==</code> have. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 15:52:57 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/equality_basic_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/inequality_success_type.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/equality_basic_result.html b/doc/html/reference/types/basic_outcome/equality_basic_result.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/equality_basic_result.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator==(const basic_result&lt;A, B, C&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/failure.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/equality_basic_outcome.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator==(const basic_result&lt;A, B, C&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this outcome compares equal to the other result. Comparison is done using <code>operator==</code> on  <code>value_type</code> or <code>error_type</code> if the currently chosen state is the same for both outcome and result, otherwise false is returned. Note that if the outcome is excepted, it will never compare equal to a result.</p>
+
+<p><em>Requires</em>: <code>operator==</code> must be a valid expression between <code>value_type</code> and <code>A</code>, and between <code>error_type</code> and <code>B</code>. If <code>value_type</code> is <code>void</code>, then so must be <code>A</code>; similarly for <code>error_type</code> and <code>B</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator==</code> have. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 15:52:57 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/failure.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/equality_basic_outcome.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/equality_failure_type.html b/doc/html/reference/types/basic_outcome/equality_failure_type.html
new file mode 100644
index 000000000..eebfa8650
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/equality_failure_type.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator==(const failure_type&lt;A, B&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/inequality_success_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/inequality_basic_result.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator==(const failure_type&lt;A, B&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this outcome is unsuccessful and its error compares equal to the error in the failure type sugar. Comparison is done using <code>operator==</code> on <code>error_type</code> and <code>A</code> and on <code>exception_type</code> and <code>B</code>.</p>
+
+<p><em>Requires</em>: <code>operator==</code> must be a valid expression between <code>error_type</code> and <code>A</code>, or <code>A</code> is <code>void</code>; <code>operator==</code> must be a valid expression between <code>exception_type</code> and <code>B</code>, or <code>B</code> is <code>void</code>. If <code>error_type</code> is <code>void</code>, then so must be <code>A</code>; if <code>exception_type</code> is <code>void</code>, then so must be <code>B</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator==</code> has. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/inequality_success_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/inequality_basic_result.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/equality_success_type.html b/doc/html/reference/types/basic_outcome/equality_success_type.html
new file mode 100644
index 000000000..ced262a8a
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/equality_success_type.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator!=(const success_type&lt;A&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/inequality_basic_outcome.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/inequality_failure_type.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator!=(const success_type&lt;A&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this outcome is not successful or its value does not compares equal to the value in the success type sugar. Comparison is done using <code>operator!=</code> on <code>value_type</code> and <code>A</code>. If <code>A</code> is <code>void</code>, this call aliases <a href="../../../reference/types/basic_outcome/has_error.html" class="api-reference"><code>bool has_error() const noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: <code>operator!=</code> must be a valid expression between <code>value_type</code> and <code>A</code>, or <code>A</code> is <code>void</code>. If <code>value_type</code> is <code>void</code>, then so must be <code>A</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator!=</code> has. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/inequality_basic_outcome.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/inequality_failure_type.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/error_lvalue.html b/doc/html/reference/types/basic_outcome/error_lvalue.html
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+++ b/doc/html/reference/types/basic_outcome/error_lvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>error_type &amp;error() &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_error_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/error_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>error_type &amp;error() &amp;</code></h1></div></div></div>
+  <p>Wide contract lvalue reference observer of the stored error. <code>NoValuePolicy::wide_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_error_check()</code> returns.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_error_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/error_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/error_lvalue_const.html b/doc/html/reference/types/basic_outcome/error_lvalue_const.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/error_lvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const error_type &amp;error() const &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/error_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/error_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const error_type &amp;error() const &amp;</code></h1></div></div></div>
+  <p>Wide contract const lvalue reference observer of the stored error. <code>NoValuePolicy::wide_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_error_check()</code> returns.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/error_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/error_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/error_rvalue.html b/doc/html/reference/types/basic_outcome/error_rvalue.html
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+++ b/doc/html/reference/types/basic_outcome/error_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>error_type &amp;&amp;error() &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/error_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/error_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>error_type &amp;&amp;error() &amp;&amp;</code></h1></div></div></div>
+  <p>Wide contract rvalue reference observer of the stored error. <code>NoValuePolicy::wide_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_error_check()</code> returns.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/error_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/error_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/error_rvalue_const.html b/doc/html/reference/types/basic_outcome/error_rvalue_const.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/error_rvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const error_type &amp;&amp;error() const &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/error_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_exception_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const error_type &amp;&amp;error() const &amp;&amp;</code></h1></div></div></div>
+  <p>Wide contract const rvalue reference observer of the stored error. <code>NoValuePolicy::wide_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_error_check()</code> returns.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/error_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_exception_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/exception_lvalue.html b/doc/html/reference/types/basic_outcome/exception_lvalue.html
new file mode 100644
index 000000000..7198d35d2
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/exception_lvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>exception_type &amp;exception() &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_exception_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/exception_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>exception_type &amp;exception() &amp;</code></h1></div></div></div>
+  <p>Wide contract lvalue reference observer of the stored exception. <code>NoValuePolicy::wide_exception_check()</code> is first invoked, then the reference to the exception is returned. As a valid default constructed exception is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_exception_check()</code> returns.</p>
+
+<p>Note that if <code>exception_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_exception_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_exception_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/exception_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/exception_lvalue_const.html b/doc/html/reference/types/basic_outcome/exception_lvalue_const.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/exception_lvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const exception_type &amp;exception() const &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/exception_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/exception_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const exception_type &amp;exception() const &amp;</code></h1></div></div></div>
+  <p>Wide contract const lvalue reference observer of the stored exception. <code>NoValuePolicy::wide_exception_check()</code> is first invoked, then the reference to the exception is returned. As a valid default constructed exception is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_exception_check()</code> returns.</p>
+
+<p>Note that if <code>exception_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_exception_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/exception_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/exception_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/exception_rvalue.html b/doc/html/reference/types/basic_outcome/exception_rvalue.html
new file mode 100644
index 000000000..89d7a5948
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/exception_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>exception_type &amp;&amp;exception() &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/exception_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/exception_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>exception_type &amp;&amp;exception() &amp;&amp;</code></h1></div></div></div>
+  <p>Wide contract rvalue reference observer of the stored exception. <code>NoValuePolicy::wide_exception_check()</code> is first invoked, then the reference to the exception is returned. As a valid default constructed exception is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_exception_check()</code> returns.</p>
+
+<p>Note that if <code>exception_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_exception_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/exception_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/exception_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/exception_rvalue_const.html b/doc/html/reference/types/basic_outcome/exception_rvalue_const.html
new file mode 100644
index 000000000..6921eea4e
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/exception_rvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const exception_type &amp;&amp;exception() const &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/exception_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/failure.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const exception_type &amp;&amp;exception() const &amp;&amp;</code></h1></div></div></div>
+  <p>Wide contract const rvalue reference observer of the stored exception. <code>NoValuePolicy::wide_exception_check()</code> is first invoked, then the reference to the exception is returned. As a valid default constructed exception is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_exception_check()</code> returns.</p>
+
+<p>Note that if <code>exception_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_exception_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/exception_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/failure.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_copy_converting_constructor.html b/doc/html/reference/types/basic_outcome/explicit_copy_converting_constructor.html
new file mode 100644
index 000000000..128584db4
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_copy_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(const basic_outcome&lt;A, B, C, D&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(const basic_outcome&lt;A, B, C, D&gt; &amp;)</code></h1></div></div></div>
+  <p>Explicit converting copy constructor from compatible <code>basic_outcome</code>. Calls <a href="../../../reference/policies/base/on_outcome_copy_construction.html" class="api-reference"><code>void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;A, B, C, D&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the copy constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_inplace_error_constructor.html b/doc/html/reference/types/basic_outcome/explicit_inplace_error_constructor.html
new file mode 100644
index 000000000..e66fdf213
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_inplace_error_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(in_place_type_t&lt;error_type_if_enabled&gt;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_value_constructor_il.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_error_constructor_il.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(in_place_type_t&lt;error_type_if_enabled&gt;, Args ...)</code></h1></div></div></div>
+  <p>Explicit inplace error constructor. Calls <a href="../../../reference/policies/base/on_outcome_in_place_construction.html" class="api-reference"><code>void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ with <code>this</code>, <code>in_place_type&lt;error_type&gt;</code> and <code>Args ...</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_inplace_error_constructor&lt;Args ...&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_value_constructor_il.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_error_constructor_il.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_inplace_error_constructor_il.html b/doc/html/reference/types/basic_outcome/explicit_inplace_error_constructor_il.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_inplace_error_constructor_il.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(in_place_type_t&lt;error_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_error_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_exception_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(in_place_type_t&lt;error_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></h1></div></div></div>
+  <p>Explicit inplace error constructor. Calls <a href="../../../reference/policies/base/on_outcome_in_place_construction.html" class="api-reference"><code>void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ with <code>this</code>, <code>in_place_type&lt;error_type&gt;</code>, <code>std::initializer_list&lt;U&gt;</code> and <code>Args ...</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_inplace_error_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>std::initializer_list&lt;U&gt;, Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_error_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_exception_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_inplace_exception_constructor.html b/doc/html/reference/types/basic_outcome/explicit_inplace_exception_constructor.html
new file mode 100644
index 000000000..e5c806636
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_inplace_exception_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(in_place_type_t&lt;exception_type_if_enabled&gt;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_error_constructor_il.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_exception_constructor_il.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(in_place_type_t&lt;exception_type_if_enabled&gt;, Args ...)</code></h1></div></div></div>
+  <p>Explicit inplace exception constructor. Calls <a href="../../../reference/policies/base/on_outcome_in_place_construction.html" class="api-reference"><code>void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ with <code>this</code>, <code>in_place_type&lt;exception_type&gt;</code> and <code>Args ...</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_inplace_exception_constructor&lt;Args ...&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>exception_type</code> constructor which accepts <code>Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_error_constructor_il.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_exception_constructor_il.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_inplace_exception_constructor_il.html b/doc/html/reference/types/basic_outcome/explicit_inplace_exception_constructor_il.html
new file mode 100644
index 000000000..58b176567
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_inplace_exception_constructor_il.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(in_place_type_t&lt;exception_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_exception_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_inplace_value_error_exception_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(in_place_type_t&lt;exception_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></h1></div></div></div>
+  <p>Explicit inplace exception constructor. Calls <a href="../../../reference/policies/base/on_outcome_in_place_construction.html" class="api-reference"><code>void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ with <code>this</code>, <code>in_place_type&lt;exception_type&gt;</code>, <code>std::initializer_list&lt;U&gt;</code> and <code>Args ...</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_inplace_exception_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>exception_type</code> constructor which accepts <code>std::initializer_list&lt;U&gt;, Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_exception_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_inplace_value_error_exception_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_inplace_value_constructor.html b/doc/html/reference/types/basic_outcome/explicit_inplace_value_constructor.html
new file mode 100644
index 000000000..0c7baee59
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_inplace_value_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(in_place_type_t&lt;value_type_if_enabled&gt;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_result_make_error_code_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_value_constructor_il.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(in_place_type_t&lt;value_type_if_enabled&gt;, Args ...)</code></h1></div></div></div>
+  <p>Explicit inplace value constructor. Calls <a href="../../../reference/policies/base/on_outcome_in_place_construction.html" class="api-reference"><code>void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ with <code>this</code>, <code>in_place_type&lt;value_type&gt;</code> and <code>Args ...</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_inplace_value_constructor&lt;Args ...&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>value_type</code> constructor which accepts <code>Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_result_make_error_code_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_value_constructor_il.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_inplace_value_constructor_il.html b/doc/html/reference/types/basic_outcome/explicit_inplace_value_constructor_il.html
new file mode 100644
index 000000000..e58891709
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_inplace_value_constructor_il.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(in_place_type_t&lt;value_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_value_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_error_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(in_place_type_t&lt;value_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></h1></div></div></div>
+  <p>Explicit inplace value constructor. Calls <a href="../../../reference/policies/base/on_outcome_in_place_construction.html" class="api-reference"><code>void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ with <code>this</code>, <code>in_place_type&lt;value_type&gt;</code>, &lsquo;std::initializer_list<U>&rsquo; and <code>Args ...</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_inplace_value_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>value_type</code> constructor which accepts <code>std::initializer_list&lt;U&gt;, Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_value_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_error_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_move_converting_constructor.html b/doc/html/reference/types/basic_outcome/explicit_move_converting_constructor.html
new file mode 100644
index 000000000..f92a5330e
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_move_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(basic_outcome&lt;A, B, C, D&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_result_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(basic_outcome&lt;A, B, C, D&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Explicit converting move constructor from compatible <code>basic_outcome</code>. Calls <a href="../../../reference/policies/base/on_outcome_move_construction.html" class="api-reference"><code>void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;A, B, C, D&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the move constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_result_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_result_copy_converting_constructor.html b/doc/html/reference/types/basic_outcome/explicit_result_copy_converting_constructor.html
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+++ b/doc/html/reference/types/basic_outcome/explicit_result_copy_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(const basic_result&lt;A, B, C&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_result_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(const basic_result&lt;A, B, C&gt; &amp;)</code></h1></div></div></div>
+  <p>Explicit converting copy constructor from compatible <code>basic_result</code>. Calls <a href="../../../reference/policies/base/on_outcome_copy_construction.html" class="api-reference"><code>void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;A, B, void, C&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the copy constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_result_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_result_make_error_code_copy_converting_constructor.html b/doc/html/reference/types/basic_outcome/explicit_result_make_error_code_copy_converting_constructor.html
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index 000000000..eacf94bf8
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_result_make_error_code_copy_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(const basic_result&lt;A, B, C&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_result_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_result_make_error_code_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(const basic_result&lt;A, B, C&gt; &amp;)</code></h1></div></div></div>
+  <p>Explicit converting copy constructor from compatible <code>basic_result</code>. Calls <a href="../../../reference/policies/base/on_outcome_copy_construction.html" class="api-reference"><code>void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_error_code_compatible_conversion&lt;A, B, void, C&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the copy constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_result_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_result_make_error_code_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_result_make_error_code_move_converting_constructor.html b/doc/html/reference/types/basic_outcome/explicit_result_make_error_code_move_converting_constructor.html
new file mode 100644
index 000000000..724064e47
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_result_make_error_code_move_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_result_make_error_code_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_value_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Explicit converting move constructor from compatible <code>basic_result</code>. Calls <a href="../../../reference/policies/base/on_outcome_move_construction.html" class="api-reference"><code>void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_error_code_compatible_conversion&lt;A, B, void, C&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the move constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_result_make_error_code_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_inplace_value_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_result_move_converting_constructor.html b/doc/html/reference/types/basic_outcome/explicit_result_move_converting_constructor.html
new file mode 100644
index 000000000..7298904eb
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_result_move_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_result_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_result_make_error_code_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Explicit converting move constructor from compatible <code>basic_result</code>. Calls <a href="../../../reference/policies/base/on_outcome_move_construction.html" class="api-reference"><code>void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;A, B, void, C&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the move constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_result_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_result_make_error_code_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html b/doc/html/reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html
new file mode 100644
index 000000000..bac339063
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_outcome(concepts::value_or_error&lt;T, E&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_error_exception_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_outcome(concepts::value_or_error&lt;T, E&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Explicit converting constructor from <a href="../../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" class="api-reference"><code>concepts::value_or_error&lt;T, E&gt;</code></a>
+ concept matching types. Delegates to the <code>basic_result</code> move constructor <a href="../../../reference/types/basic_outcome/explicit_result_move_converting_constructor.html" class="api-reference"><code>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;)</code></a>
+.</p>
+
+<p><em>Requires</em>: <code>convert::</code><a href="../../../reference/converters/value_or_error.html" class="api-reference"><code>value_or_error&lt;T, U&gt;</code></a>
+ has an available call operator, and if the input is a <code>basic_result</code> or <code>basic_outcome</code>, then <code>convert::value_or_error&lt;&gt;</code> has enabled those inputs for that <code>convert::value_or_error&lt;&gt;</code> specialisation.</p>
+
+<p><em>Complexity</em>: Same as for the copy or move constructor from the input&rsquo;s <code>.value()</code> or <code>.error()</code> respectively. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_error_exception_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/failure.html b/doc/html/reference/types/basic_outcome/failure.html
new file mode 100644
index 000000000..6579a5678
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/failure.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>exception_type failure() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/exception_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/equality_basic_result.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>exception_type failure() const noexcept</code></h1></div></div></div>
+  <p>Synthesising observer of the stored exception or error. If an exception is available,
+returns a copy of that directly. If an error is available, and not an exception, an
+ADL discovered free function <a href="../../../reference/functions/policy/basic_outcome_failure_exception_from_error.html" class="api-reference"><code>auto basic_outcome_failure_exception_from_error(const EC &amp;)</code></a>
+
+is invoked. Default overloads for this function are defined in Outcome for 
+<a href="https://en.cppreference.com/w/cpp/error/error_code" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::error_code</code></a>
+
+and <code>boost::system::error_code</code>, these return <code>std::make_exception_ptr(std::system_error(ec))</code>
+and <code>boost::copy_exception(boost::system::system_error(ec))</code> respectively.</p>
+
+<p><em>Requires</em>: Both the traits <a href="../../../reference/traits/is_error_code_available.html" class="api-reference"><code>is_error_code_available&lt;T&gt;</code></a>
+ and
+<a href="../../../reference/traits/is_exception_ptr_available.html" class="api-reference"><code>is_exception_ptr_available&lt;T&gt;</code></a>
+ are true.</p>
+
+<p><em>Complexity</em>: Depends on <code>basic_outcome_failure_exception_from_error(const EC &amp;)</code>.</p>
+
+<p><em>Guarantees</em>: Never throws. If an exception is thrown during the copy of the exception,
+that exception (from <code>std::current_exception()</code>) is returned instead.</p>
+
+
+        </div><p><small>Last revised: February 05, 2019 at 21:41:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/exception_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/equality_basic_result.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/has_error.html b/doc/html/reference/types/basic_outcome/has_error.html
new file mode 100644
index 000000000..3dcd3562b
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/has_error.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool has_error() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/has_value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/has_exception.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool has_error() const noexcept</code></h1></div></div></div>
+  <p>Returns true if an error is present. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/has_value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/has_exception.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/has_exception.html b/doc/html/reference/types/basic_outcome/has_exception.html
new file mode 100644
index 000000000..dd45e1091
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/has_exception.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool has_exception() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/has_error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/has_failure.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool has_exception() const noexcept</code></h1></div></div></div>
+  <p>Returns true if an exception is present. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/has_error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/has_failure.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/has_failure.html b/doc/html/reference/types/basic_outcome/has_failure.html
new file mode 100644
index 000000000..39e38da12
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/has_failure.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool has_failure() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/has_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_value_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool has_failure() const noexcept</code></h1></div></div></div>
+  <p>Returns true if there is either an error or an exception. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/has_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_value_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/has_value.html b/doc/html/reference/types/basic_outcome/has_value.html
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+++ b/doc/html/reference/types/basic_outcome/has_value.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool has_value() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/operator_bool.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/has_error.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool has_value() const noexcept</code></h1></div></div></div>
+  <p>Returns true if a value is present. Constexpr where possible. Alias for <a href="../../../reference/types/basic_outcome/operator_bool.html" class="api-reference"><code>explicit operator bool() const noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/operator_bool.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/has_error.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_error_condition_converting_constructor.html b/doc/html/reference/types/basic_outcome/implicit_error_condition_converting_constructor.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_error_condition_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(ErrorCondEnum &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_error_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_exception_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(ErrorCondEnum &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit <code>error_type</code> from <code>ErrorCondEnum</code> constructor. Calls <a href="../../../reference/policies/base/on_outcome_construction.html" class="api-reference"><code>void on_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>ErrorCondEnum</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_error_condition_converting_constructor&lt;R&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for <code>error_type</code>&rsquo;s copy or move constructor from the result of <code>make_error_code(ErrorCondEnum)</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the input is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_error_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_exception_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_error_converting_constructor.html b/doc/html/reference/types/basic_outcome/implicit_error_converting_constructor.html
new file mode 100644
index 000000000..cea850736
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_error_converting_constructor.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(S &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_value_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_error_condition_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(S &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit <code>error_type</code> constructor. Calls <a href="../../../reference/policies/base/on_outcome_construction.html" class="api-reference"><code>void on_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>S</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_error_converting_constructor&lt;S&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for <code>error_type</code>&rsquo;s copy or move constructor. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_value_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_error_condition_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_error_exception_converting_constructor.html b/doc/html/reference/types/basic_outcome/implicit_error_exception_converting_constructor.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_error_exception_converting_constructor.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(S &amp;&amp;, P &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_exception_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(S &amp;&amp;, P &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit <code>error_type</code> + <code>exception_type</code> constructor. Calls <a href="../../../reference/policies/base/on_outcome_construction2.html" class="api-reference"><code>void on_outcome_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+ with <code>this</code>, <code>S</code> and <code>P</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_error_exception_converting_constructor&lt;S, P&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for <code>error_type</code>&rsquo;s and <code>exception_type</code>&rsquo;s copy or move constructor. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_exception_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_exception_converting_constructor.html b/doc/html/reference/types/basic_outcome/implicit_exception_converting_constructor.html
new file mode 100644
index 000000000..38f29657f
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_exception_converting_constructor.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(P &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_error_condition_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_error_exception_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(P &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit <code>exception_type</code> constructor. Calls <a href="../../../reference/policies/base/on_outcome_construction.html" class="api-reference"><code>void on_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>P</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_exception_converting_constructor&lt;P&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for <code>exception_type</code>&rsquo;s copy or move constructor. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_error_condition_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_error_exception_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_failure_error_copy_constructor.html b/doc/html/reference/types/basic_outcome/implicit_failure_error_copy_constructor.html
new file mode 100644
index 000000000..9e8554840
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_failure_error_copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(const failure_type&lt;EC&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_success_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(const failure_type&lt;EC&gt; &amp;)</code></h1></div></div></div>
+  <p>Implicit error-from-failure-type-sugar copy constructor used to disambiguate the construction of the error type.
+Calls <a href="../../../reference/policies/base/on_outcome_copy_construction.html" class="api-reference"><code>void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>const failure_type&lt;EC&gt; &amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;void, EC, void, void&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>EC</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_success_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_failure_error_exception_copy_constructor.html b/doc/html/reference/types/basic_outcome/implicit_failure_error_exception_copy_constructor.html
new file mode 100644
index 000000000..bc105544e
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_failure_error_exception_copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(const failure_type&lt;EC, EP&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_exception_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_exception_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(const failure_type&lt;EC, EP&gt; &amp;)</code></h1></div></div></div>
+  <p>Implicit error-and-exception-from-failure-type-sugar copy constructor used to disambiguate the construction of the error + exception types.
+Calls <a href="../../../reference/policies/base/on_outcome_copy_construction2.html" class="api-reference"><code>void on_outcome_copy_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+ with <code>this</code>, <code>const failure_type&lt;EC&gt; &amp;</code> and <code>const failure_type&lt;EP&gt; &amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;void, EC, EP, void&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> and <code>exception_type</code> constructors which accept <code>EC</code> and <code>EP</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_exception_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_exception_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_failure_error_exception_move_constructor.html b/doc/html/reference/types/basic_outcome/implicit_failure_error_exception_move_constructor.html
new file mode 100644
index 000000000..4062ae8dc
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_failure_error_exception_move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(failure_type&lt;EC, EP&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_exception_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/operator_bool.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(failure_type&lt;EC, EP&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit error-and-exception-from-failure-type-sugar move constructor used to disambiguate the construction of the error + exception types.
+Calls <a href="../../../reference/policies/base/on_outcome_move_construction2.html" class="api-reference"><code>void on_outcome_move_construction(T *, U &amp;&amp;, V &amp;&amp;) noexcept</code></a>
+ with <code>this</code>, <code>failure_type&lt;EC&gt; &amp;&amp;</code> and <code>failure_type&lt;EP&gt; &amp;&amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;void, EC, EP, void&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> and <code>exception_type</code> constructors which accept <code>EC</code> and <code>EP</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_exception_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/operator_bool.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_failure_error_make_error_code_copy_constructor.html b/doc/html/reference/types/basic_outcome/implicit_failure_error_make_error_code_copy_constructor.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_failure_error_make_error_code_copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(const failure_type&lt;EC&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_make_error_code_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(const failure_type&lt;EC&gt; &amp;)</code></h1></div></div></div>
+  <p>Implicit error-from-failure-type-sugar copy constructor used to disambiguate the construction of the error type.
+Calls <a href="../../../reference/policies/base/on_outcome_copy_construction.html" class="api-reference"><code>void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>const failure_type&lt;EC&gt; &amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_error_code_compatible_conversion&lt;void, EC, void, void&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>EC</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_make_error_code_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_failure_error_make_error_code_move_constructor.html b/doc/html/reference/types/basic_outcome/implicit_failure_error_make_error_code_move_constructor.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_failure_error_make_error_code_move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(failure_type&lt;EC&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_make_error_code_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_exception_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(failure_type&lt;EC&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit error-from-failure-type-sugar move constructor used to disambiguate the construction of the error type.
+Calls <a href="../../../reference/policies/base/on_outcome_move_construction.html" class="api-reference"><code>void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>failure_type&lt;EC&gt; &amp;&amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_error_code_compatible_conversion&lt;void, EC, void, void&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>EC</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_make_error_code_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_exception_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_failure_error_move_constructor.html b/doc/html/reference/types/basic_outcome/implicit_failure_error_move_constructor.html
new file mode 100644
index 000000000..71ab444d0
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_failure_error_move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(failure_type&lt;EC&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_make_error_code_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(failure_type&lt;EC&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit error-from-failure-type-sugar move constructor used to disambiguate the construction of the error type.
+Calls <a href="../../../reference/policies/base/on_outcome_move_construction.html" class="api-reference"><code>void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>failure_type&lt;EC&gt; &amp;&amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;void, EC, void, void&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>EC</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_make_error_code_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_failure_exception_copy_constructor.html b/doc/html/reference/types/basic_outcome/implicit_failure_exception_copy_constructor.html
new file mode 100644
index 000000000..6dd257fc3
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_failure_exception_copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(const failure_type&lt;EP&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_make_error_code_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_exception_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(const failure_type&lt;EP&gt; &amp;)</code></h1></div></div></div>
+  <p>Implicit exception-from-failure-type-sugar copy constructor used to disambiguate the construction of the exception type.
+Calls <a href="../../../reference/policies/base/on_outcome_copy_construction.html" class="api-reference"><code>void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>const failure_type&lt;EP&gt; &amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;void, void, EP, void&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>exception_type</code> constructor which accepts <code>EP</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_make_error_code_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_exception_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_failure_exception_move_constructor.html b/doc/html/reference/types/basic_outcome/implicit_failure_exception_move_constructor.html
new file mode 100644
index 000000000..daf0c4b7c
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_failure_exception_move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(failure_type&lt;EP&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_exception_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_exception_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(failure_type&lt;EP&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit exception-from-failure-type-sugar move constructor used to disambiguate the construction of the exception type.
+Calls <a href="../../../reference/policies/base/on_outcome_move_construction.html" class="api-reference"><code>void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>failure_type&lt;EP&gt; &amp;&amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;void, void, EP, void&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>exception_type</code> constructor which accepts <code>EP</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_exception_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_exception_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_inplace_value_error_exception_constructor.html b/doc/html/reference/types/basic_outcome/implicit_inplace_value_error_exception_constructor.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_inplace_value_error_exception_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(A1 &amp;&amp;, A2 &amp;&amp;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_exception_constructor_il.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_success_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(A1 &amp;&amp;, A2 &amp;&amp;, Args ...)</code></h1></div></div></div>
+  <p>Implicit inplace value or error or exception constructor. Delegates to an appropriate explicit inplace constructor depending on input.</p>
+
+<p><em>Requires</em>: predicate::enable_inplace_value_error_exception_constructor<A1, A2, Args ...>` is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>value_type</code> or <code>error_type</code> or <code>exception_type</code> constructor which accepts <code>A1, A2, Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/explicit_inplace_exception_constructor_il.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_success_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_success_copy_constructor.html b/doc/html/reference/types/basic_outcome/implicit_success_copy_constructor.html
new file mode 100644
index 000000000..ab8e66aeb
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_success_copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(const success_type&lt;T&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_inplace_value_error_exception_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_success_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(const success_type&lt;T&gt; &amp;)</code></h1></div></div></div>
+  <p>Implicit value-from-success-type-sugar copy constructor used to disambiguate the construction of the value type.
+Note that if <code>T = void</code>, <code>value_type</code> will be default constructed.  Calls <a href="../../../reference/policies/base/on_outcome_copy_construction.html" class="api-reference"><code>void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>const success_type&lt;T&gt; &amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>.</p>
+
+<p><em>Complexity</em>: Same as for the <code>value_type</code> constructor which accepts <code>T</code>, or the <code>value_type</code> default constructor if <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_inplace_value_error_exception_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_success_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_success_move_constructor.html b/doc/html/reference/types/basic_outcome/implicit_success_move_constructor.html
new file mode 100644
index 000000000..cc7f66368
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_success_move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(success_type&lt;T&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_success_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(success_type&lt;T&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit value-from-success-type-sugar move constructor used to disambiguate the construction of the value type.
+Note that if <code>T = void</code>, <code>value_type</code> will be default constructed.  Calls <a href="../../../reference/policies/base/on_outcome_move_construction.html" class="api-reference"><code>void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>success_type&lt;T&gt; &amp;&amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>.</p>
+
+<p><em>Complexity</em>: Same as for the <code>value_type</code> constructor which accepts <code>T</code>, or the <code>value_type</code> default constructor if <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_success_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_failure_error_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/implicit_value_converting_constructor.html b/doc/html/reference/types/basic_outcome/implicit_value_converting_constructor.html
new file mode 100644
index 000000000..2f329d675
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/implicit_value_converting_constructor.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(R &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/disabling_implicit_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_error_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(R &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit <code>value_type</code> constructor. Calls <a href="../../../reference/policies/base/on_outcome_construction.html" class="api-reference"><code>void on_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>R</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_value_converting_constructor&lt;R&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for <code>value_type</code>&rsquo;s copy or move constructor. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/disabling_implicit_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/implicit_error_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/inequality_basic_outcome.html b/doc/html/reference/types/basic_outcome/inequality_basic_outcome.html
new file mode 100644
index 000000000..418ef4816
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/inequality_basic_outcome.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator!=(const basic_outcome&lt;A, B, C, D&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/inequality_basic_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/equality_success_type.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator!=(const basic_outcome&lt;A, B, C, D&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this outcome does not compare equal to the other outcome. Comparison is done using <code>operator!=</code> on <code>value_type</code>, <code>error_type</code> and/or <code>exception_type</code> if the currently chosen state is the same for both outcomes, otherwise true is returned.</p>
+
+<p><em>Requires</em>: <code>operator!=</code> must be a valid expression between <code>value_type</code> and <code>A</code>, and between <code>error_type</code> and <code>B</code>, and between <code>exception_type</code> and <code>C</code>. If <code>value_type</code> is <code>void</code>, then so must be <code>A</code>; similarly for <code>error_type</code> and <code>B</code>; similarly for <code>exception_type</code> and <code>C</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator!=</code> have. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 15:52:57 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/inequality_basic_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/equality_success_type.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/inequality_basic_result.html b/doc/html/reference/types/basic_outcome/inequality_basic_result.html
new file mode 100644
index 000000000..08693108a
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/inequality_basic_result.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/equality_failure_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/inequality_basic_outcome.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this outcome does not compare equal to the other result. Comparison is done using <code>operator!=</code> on <code>value_type</code> or <code>error_type</code> if the currently chosen state is the same for both outcome and result, otherwise true is returned. Note that an excepted outcome is always unequal to a result.</p>
+
+<p><em>Requires</em>: <code>operator!=</code> must be a valid expression between <code>value_type</code> and <code>A</code>, and between <code>error_type</code> and <code>B</code>. If <code>value_type</code> is <code>void</code>, then so must be <code>A</code>; similarly for <code>error_type</code> and <code>B</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator!=</code> have. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 15:52:57 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/equality_failure_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/inequality_basic_outcome.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/inequality_failure_type.html b/doc/html/reference/types/basic_outcome/inequality_failure_type.html
new file mode 100644
index 000000000..5bcdd8d4f
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/inequality_failure_type.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator!=(const failure_type&lt;A, B&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/equality_success_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/swap.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator!=(const failure_type&lt;A, B&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this outcome is successful or its error or exception does not compare equal to the error in the failure type sugar. Comparison is done using <code>operator!=</code> on <code>error_type</code> and <code>A</code> and on <code>exception_type</code> and <code>B</code>.</p>
+
+<p><em>Requires</em>: <code>operator!=</code> must be a valid expression between <code>error_type</code> and <code>A</code>, or <code>A</code> is <code>void</code>; <code>operator!=</code> must be a valid expression between <code>exception_type</code> and <code>B</code>, or <code>B</code> is <code>void</code>. If <code>error_type</code> is <code>void</code>, then so must be <code>A</code>; if <code>exception_type</code> is <code>void</code>, then so must be <code>B</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator!=</code> has. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/equality_success_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/swap.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/inequality_success_type.html b/doc/html/reference/types/basic_outcome/inequality_success_type.html
new file mode 100644
index 000000000..37a49566a
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/inequality_success_type.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator==(const success_type&lt;A&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/equality_basic_outcome.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/equality_failure_type.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator==(const success_type&lt;A&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this result is successful and its value compares equal to the value in the success type sugar. Comparison is done using <code>operator==</code> on <code>value_type</code> and <code>A</code>. If <code>A</code> is <code>void</code>, this call aliases <a href="../../../reference/types/basic_outcome/has_value.html" class="api-reference"><code>bool has_value() const noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: <code>operator==</code> must be a valid expression between <code>value_type</code> and <code>A</code>, or <code>A</code> is <code>void</code>. If <code>value_type</code> is <code>void</code>, then so must be <code>A</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator==</code> has. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/equality_basic_outcome.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/equality_failure_type.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/move_assignment.html b/doc/html/reference/types/basic_outcome/move_assignment.html
new file mode 100644
index 000000000..427e2eb99
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/move_assignment.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome &amp;operator=(basic_outcome &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/copy_assignment.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome &amp;operator=(basic_outcome &amp;&amp;)</code></h1></div></div></div>
+  <p>Move assignment.</p>
+
+<p><em>Requires</em>: that <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> all implement move assignment.</p>
+
+<p><em>Complexity</em>: If the <code>value_type</code> for both is present, uses <code>value_type</code>&rsquo;s move assignment operator, else either destructs or move constructs <code>value_type</code> as appropriate. <code>error_type</code>&rsquo;s and <code>exception_type</code>&rsquo;s move assignment operator are always used. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/copy_assignment.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/move_constructor.html b/doc/html/reference/types/basic_outcome/move_constructor.html
new file mode 100644
index 000000000..f68b711e3
--- /dev/null
+++ b/doc/html/reference/types/basic_outcome/move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_outcome(basic_outcome &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/default.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_outcome(basic_outcome &amp;&amp;)</code></h1></div></div></div>
+  <p>Move constructor.</p>
+
+<p><em>Requires</em>: that <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> all implement a move constructor.</p>
+
+<p><em>Complexity</em>: Same as for <code>value_type</code>&rsquo;s, <code>error_type</code>&rsquo;s and <code>exception_type</code>&rsquo;s move constructors. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/default.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_outcome/operator_bool.html b/doc/html/reference/types/basic_outcome/operator_bool.html
new file mode 100644
index 000000000..010b2dd62
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+++ b/doc/html/reference/types/basic_outcome/operator_bool.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit operator bool() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_exception_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/has_value.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit operator bool() const noexcept</code></h1></div></div></div>
+  <p>Returns true if a value is present. Constexpr where possible. Alias for <a href="../../../reference/types/basic_outcome/has_value.html" class="api-reference"><code>bool has_value() const noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/implicit_failure_error_exception_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/reference/types/basic_outcome/swap.html b/doc/html/reference/types/basic_outcome/swap.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void swap(basic_outcome &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/inequality_failure_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/as_failure_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void swap(basic_outcome &amp;)</code></h1></div></div></div>
+  <p>Swap one basic_outcome with another, with the strong guarantee. Constexpr if move constructors and move assignments of <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> are noexcept.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: If the move constructor and move assignment for <code>value_type</code>, <code>error_type</code> and <code>exception_type</code> are noexcept, the complexity is the same as for the <code>swap()</code> implementations of the <code>value_type</code>, <code>error_type</code> and <code>exception_type</code>. Otherwise, complexity is not preserved, as <a href="../../../reference/functions/strong_swap.html" class="api-reference"><code>strong_swap(bool &amp;all_good, T &amp;a, T &amp;b)</code></a>
+ is used instead of <code>swap()</code>. This function defaults to using one move construction and two assignments, and it will attempt extra move assignments in order to restore the state upon entry if a failure occurs.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the swap operation, the state of all three operands on entry is attempted to be restored, in order to implement the strong guarantee. If that too fails, the flag bits are forced to something consistent such that there can be no simultaneously valued and errored/excepted state, or valueless and errorless/exceptionless. The flag <a href="../../../reference/types/basic_result/has_lost_consistency.html" class="api-reference"><code>has_lost_consistency()</code></a>
+ becomes true for both operands, which are now likely in an inconsistent state.</p>
+
+
+        </div><p><small>Last revised: June 25, 2019 at 17:01:21 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/inequality_failure_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/reference/types/basic_outcome/value_lvalue.html b/doc/html/reference/types/basic_outcome/value_lvalue.html
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+++ b/doc/html/reference/types/basic_outcome/value_lvalue.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_type &amp;value() &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_value_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/value_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_type &amp;value() &amp;</code></h1></div></div></div>
+  <p>Wide contract lvalue reference observer of any value present. <code>NoValuePolicy::wide_value_check()</code> is first invoked, then the reference to the value is returned.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/assume_value_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/reference/types/basic_outcome/value_lvalue_const.html b/doc/html/reference/types/basic_outcome/value_lvalue_const.html
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+++ b/doc/html/reference/types/basic_outcome/value_lvalue_const.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const value_type &amp;value() const &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
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+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/value_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/value_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const value_type &amp;value() const &amp;</code></h1></div></div></div>
+  <p>Wide contract const lvalue reference observer of any value present. <code>NoValuePolicy::wide_value_check()</code> is first invoked, then the reference to the value is returned.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/value_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/reference/types/basic_outcome/value_rvalue.html b/doc/html/reference/types/basic_outcome/value_rvalue.html
new file mode 100644
index 000000000..a90939ea0
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+++ b/doc/html/reference/types/basic_outcome/value_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_type &amp;&amp;value() &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/value_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/value_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_type &amp;&amp;value() &amp;&amp;</code></h1></div></div></div>
+  <p>Wide contract rvalue reference observer of any value present. <code>NoValuePolicy::wide_value_check()</code> is first invoked, then the reference to the value is returned.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/value_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/value_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
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diff --git a/doc/html/reference/types/basic_outcome/value_rvalue_const.html b/doc/html/reference/types/basic_outcome/value_rvalue_const.html
new file mode 100644
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+++ b/doc/html/reference/types/basic_outcome/value_rvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const value_type &amp;&amp;value() const &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
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+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/value_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_error_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const value_type &amp;&amp;value() const &amp;&amp;</code></h1></div></div></div>
+  <p>Wide contract const rvalue reference observer of any value present. <code>NoValuePolicy::wide_value_check()</code> is first invoked, then the reference to the value is returned.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_outcome/value_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_outcome/assume_error_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result.html b/doc/html/reference/types/basic_result.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_result.html
@@ -0,0 +1,425 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result&lt;T, E, NoValuePolicy&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/basic_outcome/as_failure_rvalue.html"><img src="../../images/prev.png" alt="Prev"></a>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></h1></div></div></div>
+  <div class="toc"><dl class="toc">
+<dt>
+<dd><dl>
+<dt>
+<dd><dl>
+<dt><a href="#design-rationale">Design rationale</a></dt>
+<dt><a href="#public-member-type-aliases">Public member type aliases</a></dt>
+<dt><a href="#protected-member-predicate-booleans">Protected member predicate booleans</a>
+<dd><dl>
+<dt><a href="#summary-of-standard-requirements-provided-https-en-cppreference-com-w-cpp-named-req">Summary of <a href="https://en.cppreference.com/w/cpp/named_req">standard requirements provided</a></a></dt>
+</dl></dd></dt>
+<dt><a href="#public-member-functions">Public member functions</a>
+<dd><dl>
+<dt><a href="#disabling-constructors">Disabling constructors</a></dt>
+</dl></dd></dt>
+</dl></dd></dt>
+</dl></dd></dt>
+</dl>
+  </div>
+
+
+<p>A sum type carrying either a <code>T</code> or an <code>E</code>, with <code>NoValuePolicy</code> specifying what to do if one tries to read state which isn&rsquo;t there, and enabling injection of hooks to trap when lifecycle events occur. Either or both of <code>T</code> and <code>E</code> can be <code>void</code> to indicate no value for that state is present. Note that <code>E = void</code> makes basic result into effectively an <code>optional&lt;T&gt;</code>, but with <code>NoValuePolicy</code> configurable behaviour. Detectable using <a href="../../reference/traits/is_basic_result.html" class="api-reference"><code>is_basic_result&lt;T&gt;</code></a>
+.</p>
+
+<p><em>Requires</em>: Concept requirements if C++ 20, else static asserted:</p>
+
+<ul>
+<li>That trait <a href="../../reference/traits/type_can_be_used_in_basic_result.html" class="api-reference"><code>type_can_be_used_in_basic_result&lt;R&gt;</code></a>
+ is true for both <code>T</code> and <code>E</code>.</li>
+<li>That either <code>E</code> is <code>void</code> or <code>DefaultConstructible</code> (Outcome v2.1 and earlier only).</li>
+</ul>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/basic_result.hpp&gt;</code></p>
+
+<p><em>Inclusions</em>: The very lightest weight of C and C++ header files:</p>
+
+<ol>
+<li><code>&lt;cstdint&gt;</code></li>
+<li><code>&lt;initializer_list&gt;</code></li>
+<li><code>&lt;iosfwd&gt;</code></li>
+<li><code>&lt;new&gt;</code></li>
+<li><code>&lt;type_traits&gt;</code></li>
+<li>If <a href="../../reference/macros/in_place_type.html" class="api-reference"><code>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE</code></a>
+ is <code>1</code>, <code>&lt;utility&gt;</code> (defaults to <code>1</code> for C++ 17 or later only)</li>
+<li>If C++ exceptions disabled and <code>BOOST_OUTCOME_DISABLE_EXECINFO</code> undefined only (used to print stack backtraces on &ldquo;exception throw&rdquo;):
+
+<ol>
+<li><code>&lt;sal.h&gt;</code> (Windows only)</li>
+<li><code>&lt;stddef.h&gt;</code> (Windows only)</li>
+<li><code>&lt;string.h&gt;</code> (Windows only)</li>
+<li><code>&lt;execinfo.h&gt;</code> (POSIX only)</li>
+</ol></li>
+<li><code>&lt;cstdio&gt;</code></li>
+<li><code>&lt;cstdlib&gt;</code></li>
+<li><code>&lt;cassert&gt;</code></li>
+</ol>
+
+<p>This very light weight set of inclusion dependencies makes basic result suitable for use in global header files of very large C++ codebases.</p>
+
+<h3 id="design-rationale">Design rationale</h3>
+
+<p>The basic result type is the main workhorse type of the Outcome library, providing a simple sum type with optional values representing success or disappointment. Unlike 
+<a href="https://wg21.link/P0323" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> P0323 <code>std::expected&lt;T, E&gt;</code></a>
+, Outcome&rsquo;s result type is designed specifically for convenience when implementing failure handling across very large codebases, and it has a number of API differences to facilitate that.</p>
+
+<p>The first major design difference is that basic result models its constructor design on 
+<a href="https://en.cppreference.com/w/cpp/utility/variant" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::variant&lt;...&gt;</code></a>
+, rather than modelling 
+<a href="https://en.cppreference.com/w/cpp/utility/optional" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::optional&lt;T&gt;</code></a>
+&rsquo;s constructor design like <code>std::expected&lt;T, E&gt;</code> does. This means that basic result will implicitly construct either a <code>T</code> or an <code>E</code> if doing so is unambiguous, same as <code>variant</code> does. Where implicit construction is ambiguous, the implicit constructors disable and a <code>T</code> or <code>E</code> can be specified via <a href="../../reference/types/in_place_type_t.html" class="api-reference"><code>in_place_type_t&lt;T&gt;</code></a>
+, or via <a href="../../reference/types/success_type.html" class="api-reference"><code>success_type&lt;T&gt;</code></a>
+ or <a href="../../reference/traits/is_failure_type.html" class="api-reference"><code>failure_type&lt;T&gt;</code></a>
+. We implement a subset of variant&rsquo;s constructors for improved compile time impact, so the implicit and explicit constructor design is split into fixed subsets to reduce SFINAE execution.</p>
+
+<p>The second major design difference is that union storage is ONLY used when both <code>T</code> and <code>E</code> are trivially copyable or <code>void</code>, otherwise struct storage is used. This is usually not a problem, as it is assumed that <code>sizeof(E)</code> will be small for failure handling. The choice to only use union storage for trivially copyable types only very considerably reduces load on the compiler, and substantially improves compile times in very large C++ 14 codebases, because copies and moves do not need to jump through complex ceremony in order to implement the never-empty guarantees which would be required in a union storage based implementation (C++ 17 onwards does far fewer copy and move constructor instantiations, but it all adds up &ndash; work avoided is always the fastest).</p>
+
+<h3 id="public-member-type-aliases">Public member type aliases</h3>
+
+<ul>
+<li><code>value_type</code> is <code>T</code>.</li>
+<li><code>error_type</code> is <code>E</code>.</li>
+<li><code>no_value_policy_type</code> is <code>NoValuePolicy</code>.</li>
+<li><code>value_type_if_enabled</code> is <code>T</code> if construction from <code>T</code> is available, else it is a usefully named unusable internal type.</li>
+<li><code>error_type_if_enabled</code> is <code>E</code> if construction from <code>E</code> is available, else it is a usefully named unusable internal type.</li>
+<li><code>rebind&lt;A, B = E, C = NoValuePolicy&gt;</code> is <code>basic_result&lt;A, B, C&gt;</code>.</li>
+</ul>
+
+<h3 id="protected-member-predicate-booleans">Protected member predicate booleans</h3>
+
+<ul>
+<li><p><code>predicate::constructors_enabled</code> is constexpr boolean true if decayed <code>value_type</code> and decayed <code>error_type</code> are not the same type.</p></li>
+
+<li><p><code>predicate::implicit_constructors_enabled</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li>Trait <a href="../../reference/traits/is_error_type.html" class="api-reference"><code>is_error_type&lt;E&gt;</code></a>
+ is not true for both decayed <code>value_type</code> and decayed <code>error_type</code> at the same time.</li>
+<li><code>value_type</code> is not implicitly constructible from <code>error_type</code> and <code>error_type</code> is not implicitly constructible from <code>value_type</code>.<br>OR<br>trait <a href="../../reference/traits/is_error_type.html" class="api-reference"><code>is_error_type&lt;E&gt;</code></a>
+ is true for decayed <code>error_type</code> and <code>error_type</code> is not implicitly constructible from <code>value_type</code> and <code>value_type</code> is an integral type.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_value_converting_constructor&lt;A&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not this <code>basic_result</code> type.</li>
+<li><code>predicate::implicit_constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not an <code>in_place_type_t</code>.</li>
+<li>Trait <a href="../../reference/traits/is_error_type_enum.html" class="api-reference"><code>is_error_type_enum&lt;E, Enum&gt;</code></a>
+ is false for <code>error_type</code> and decayed <code>A</code>.</li>
+<li><code>value_type</code> is implicitly constructible from <code>A</code> and <code>error_type</code> is not implicitly constructible from <code>A</code>.<br>OR<br><code>value_type</code> is the exact same type as decayed <code>A</code> and <code>value_type</code> is implicitly constructible from <code>A</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_error_converting_constructor&lt;A&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not this <code>basic_result</code> type.</li>
+<li><code>predicate::implicit_constructors_enabled</code> is true.</li>
+<li>Decayed <code>A</code> is not an <code>in_place_type_t</code>.</li>
+<li>Trait <a href="../../reference/traits/is_error_type_enum.html" class="api-reference"><code>is_error_type_enum&lt;E, Enum&gt;</code></a>
+ is false for <code>error_type</code> and decayed <code>A</code>.</li>
+<li><code>value_type</code> is not implicitly constructible from <code>A</code> and <code>error_type</code> is implicitly constructible from <code>A</code>.<br>OR<br><code>error_type</code> is the exact same type as decayed <code>A</code> and <code>error_type</code> is implicitly constructible from <code>A</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_error_condition_converting_constructor&lt;ErrorCondEnum&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li>Decayed <code>ErrorCondEnum</code> is not this <code>basic_result</code> type.</li>
+<li>Decayed <code>ErrorCondEnum</code> is not an <code>in_place_type_t</code>.</li>
+<li>Trait <a href="../../reference/traits/is_error_type_enum.html" class="api-reference"><code>is_error_type_enum&lt;E, Enum&gt;</code></a>
+ is true for <code>error_type</code> and decayed <code>ErrorCondEnum</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_compatible_conversion&lt;A, B, C&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>basic_result&lt;A, B, C&gt;</code> is not this <code>basic_result</code> type.</li>
+<li><code>A</code> is <code>void</code> OR <code>value_type</code> is explicitly constructible from <code>A</code>.</li>
+<li><code>B</code> is <code>void</code> OR <code>error_type</code> is explicitly constructible from <code>B</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_make_error_code_compatible_conversion&lt;A, B, C&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>basic_result&lt;A, B, C&gt;</code> is not this <code>basic_result</code> type.</li>
+<li>Trait <a href="../../reference/traits/is_error_code_available.html" class="api-reference"><code>is_error_code_available&lt;T&gt;</code></a>
+ is true for decayed <code>error_type</code>.</li>
+<li><code>predicate::enable_compatible_conversion&lt;A, B, C&gt;</code> is not true.</li>
+<li><code>A</code> is <code>void</code> OR <code>value_type</code> is explicitly constructible from <code>A</code>.</li>
+<li><code>error_type</code> is explicitly constructible from <code>make_error_code(B)</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_make_exception_ptr_compatible_conversion&lt;A, B, C&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>basic_result&lt;A, B, C&gt;</code> is not this <code>basic_result</code> type.</li>
+<li>Trait <a href="../../reference/traits/is_exception_ptr_available.html" class="api-reference"><code>is_exception_ptr_available&lt;T&gt;</code></a>
+ is true for decayed <code>error_type</code>.</li>
+<li><code>predicate::enable_compatible_conversion&lt;A, B, C&gt;</code> is not true.</li>
+<li><code>A</code> is <code>void</code> OR <code>value_type</code> is explicitly constructible from <code>A</code>.</li>
+<li><code>error_type</code> is explicitly constructible from <code>make_exception_ptr(B)</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_inplace_value_constructor&lt;Args...&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>value_type</code> is <code>void</code> OR <code>value_type</code> is explicitly constructible from <code>Args...</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_inplace_error_constructor&lt;Args...&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>error_type</code> is <code>void</code> OR <code>error_type</code> is explicitly constructible from <code>Args...</code>.</li>
+</ol></li>
+
+<li><p><code>predicate::enable_inplace_value_error_constructor&lt;Args...&gt;</code> is constexpr boolean true if:</p>
+
+<ol>
+<li><code>predicate::constructors_enabled</code> is true.</li>
+<li><code>predicate::implicit_constructors_enabled</code> is true.</li>
+<li>Either, but not both, of <code>value_type</code> is explicitly constructible from <code>Args...</code> or <code>error_type</code> is explicitly constructible from <code>Args...</code>.</li>
+</ol></li>
+</ul>
+
+<h4 id="summary-of-standard-requirements-provided-https-en-cppreference-com-w-cpp-named-req">Summary of <a href="https://en.cppreference.com/w/cpp/named_req">standard requirements provided</a></h4>
+
+<ul>
+<li><del><code>DefaultConstructible</code></del>, always deleted to force user to choose valued or errored for every result instanced.</li>
+<li><code>MoveConstructible</code>, if both <code>value_type</code> and <code>error_type</code> implement move constructors.</li>
+<li><code>CopyConstructible</code>, if both <code>value_type</code> and <code>error_type</code> implement copy constructors.</li>
+<li><code>MoveAssignable</code>, if both <code>value_type</code> and <code>error_type</code> implement move constructors and move assignment.</li>
+<li><code>CopyAssignable</code>, if both <code>value_type</code> and <code>error_type</code> implement copy constructors and copy assignment.</li>
+<li><code>Destructible</code>.</li>
+<li><code>Swappable</code>, with the strong rather than weak guarantee. See <a href="../../reference/types/basic_result/swap.html" class="api-reference"><code>void swap(basic_result &amp;)</code></a>
+ for more information.</li>
+<li><code>TriviallyCopyable</code>, if both <code>value_type</code> and <code>error_type</code> are trivially copyable.</li>
+<li><code>TrivialType</code>, if both <code>value_type</code> and <code>error_type</code> are trivial types.</li>
+<li><code>LiteralType</code>, if both <code>value_type</code> and <code>error_type</code> are literal types.</li>
+
+<li><p><code>StandardLayoutType</code>, if both <code>value_type</code> and <code>error_type</code> are standard layout types. If so, layout of <code>basic_result</code> in C is guaranteed to be one of:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">struct</span> <span class="n">trivially_copyable_result_layout</span> <span class="p">{</span>
+  <span class="k">union</span> <span class="p">{</span>
+    <span class="n">value_type</span> <span class="n">value</span><span class="p">;</span>
+    <span class="n">error_type</span> <span class="n">error</span><span class="p">;</span>
+  <span class="p">};</span>
+  <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+<span class="p">};</span>
+</code></pre></div>
+<p>&hellip; if both <code>value_type</code> and <code>error_type</code> are <code>TriviallyCopyable</code>, otherwise:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">struct</span> <span class="n">non_trivially_copyable_result_layout</span> <span class="p">{</span>
+  <span class="n">value_type</span> <span class="n">value</span><span class="p">;</span>
+  <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+  <span class="n">error_type</span> <span class="n">error</span><span class="p">;</span>
+<span class="p">};</span>
+</code></pre></div>
+<p>Obviously, all C compatible C++ types are <code>TriviallyCopyable</code>, so if you are passing non-trivially copyable types from C++ to C, you are doing undefined behaviour.</p></li>
+
+<li><p><code>EqualityComparable</code>, if both <code>value_type</code> and <code>error_type</code> implement equality comparisons with one another.</p></li>
+
+<li><p><del><code>LessThanComparable</code></del>, not implemented due to availability of implicit conversions from <code>value_type</code> and <code>error_type</code>, this can cause major surprise (i.e. hard to diagnose bugs), so we don&rsquo;t implement these at all.</p></li>
+
+<li><p><del><code>Hash</code></del>, not implemented as a generic implementation of a unique hash for non-valued items which are unequal would require a dependency on RTTI being enabled.</p></li>
+</ul>
+
+<p>Thus <code>basic_result</code> meets the <code>Regular</code> concept if both <code>value_type</code> and <code>error_type</code> are <code>Regular</code>, except for the lack of a default constructor. Often where one needs a default constructor, wrapping <code>basic_result</code> into 
+<a href="https://en.cppreference.com/w/cpp/utility/optional" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::optional&lt;T&gt;</code></a>
+ will suffice.</p>
+
+<h3 id="public-member-functions">Public member functions</h3>
+
+<h4 id="disabling-constructors">Disabling constructors</h4>
+
+<ol class="children children-li"><li>
+	<a href="../../reference/types/basic_result/disabling_catchall.html" ><code>basic_result(Args...) = delete</code></a>
+<p>Disabling catchall constructor used to give useful diagnostic error when trying to use non-inplace constructors when <code>predicate::constructors_enabled</code> is false.</p><li>
+	<a href="../../reference/types/basic_result/disabling_implicit_constructor.html" ><code>basic_result(X &amp;&amp;) = delete</code></a>
+<p>Disabling implicit constructor used to give useful diagnostic error when trying to use implicit constructors when <code>predicate::implicit_constructors_enabled</code> is false.</p></li></ol>
+
+<h4 id="copy-and-move-constructors-and-assignment-and-destructor">Copy and move constructors and assignment, and destructor</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_result/default.html" ><code>basic_result() = delete</code></a>
+<p>The default constructor (disabled).</p><li>
+    <a href="../../reference/types/basic_result/move_constructor.html" ><code>basic_result(basic_result &amp;&amp;)</code></a>
+<p>Move constructor. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/copy_constructor.html" ><code>basic_result(const basic_result &amp;)</code></a>
+<p>Copy constructor. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/move_assignment.html" ><code>basic_result &amp;operator=(basic_result &amp;&amp;)</code></a>
+<p>Move assignment. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/copy_assignment.html" ><code>basic_result &amp;operator=(const basic_result &amp;)</code></a>
+<p>Copy assignment. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/destructor.html" ><code>~basic_result()</code></a>
+<p>Destructor. Constexpr, triviality and noexcept propagating.</p></li></ol>
+
+<h4 id="converting-constructors">Converting constructors</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_result/implicit_value_converting_constructor.html" ><code>basic_result(R &amp;&amp;)</code></a>
+<p>Implicit <code>value_type</code> constructor. Available if <code>predicate::enable_value_converting_constructor&lt;R&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/implicit_error_converting_constructor.html" ><code>basic_result(S &amp;&amp;)</code></a>
+<p>Implicit <code>error_type</code> constructor. Available if <code>predicate::enable_error_converting_constructor&lt;S&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/implicit_error_condition_converting_constructor.html" ><code>basic_result(ErrorCondEnum &amp;&amp;)</code></a>
+<p>Implicit <code>error_type</code> from <code>ErrorCondEnum</code> constructor. Available if <code>predicate::enable_error_condition_converting_constructor&lt;ErrorCondEnum&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" ><code>explicit basic_result(concepts::value_or_error&lt;T, E&gt; &amp;&amp;)</code></a>
+<p>Explicit converting constructor from <code>concepts::value_or_error&lt;T, E&gt;</code> concept matching types. Available if <code>convert::value_or_error&lt;&gt;</code> permits it. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/explicit_copy_converting_constructor.html" ><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/explicit_move_converting_constructor.html" ><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/explicit_make_error_code_copy_converting_constructor.html" ><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/explicit_make_error_code_move_converting_constructor.html" ><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/explicit_make_exception_ptr_copy_converting_constructor.html" ><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></a>
+<p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/explicit_make_exception_ptr_move_converting_constructor.html" ><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></a>
+<p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p></li></ol>
+
+<h4 id="inplace-constructors">Inplace constructors</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_result/explicit_inplace_value_constructor.html" ><code>explicit basic_result(in_place_type_t&lt;value_type_if_enabled&gt;, Args ...)</code></a>
+<p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/explicit_inplace_value_constructor_il.html" ><code>explicit basic_result(in_place_type_t&lt;value_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
+<p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/explicit_inplace_error_constructor.html" ><code>explicit basic_result(in_place_type_t&lt;error_type_if_enabled&gt;, Args ...)</code></a>
+<p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/explicit_inplace_error_constructor_il.html" ><code>explicit basic_result(in_place_type_t&lt;error_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
+<p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/implicit_inplace_value_error_constructor.html" ><code>basic_result(A1 &amp;&amp;, A2 &amp;&amp;, Args ...)</code></a>
+<p>Implicit inplace value or error constructor. Available if <code>predicate::enable_inplace_value_error_constructor&lt;A1, A2, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p></li></ol>
+
+<h4 id="tagged-constructors">Tagged constructors</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_result/implicit_success_copy_constructor.html" ><code>basic_result(const success_type&lt;T&gt; &amp;)</code></a>
+<p>Implicit value-from-success-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/implicit_success_move_constructor.html" ><code>basic_result(success_type&lt;T&gt; &amp;&amp;)</code></a>
+<p>Implicit value-from-success-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/implicit_failure_copy_constructor.html" ><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/implicit_failure_move_constructor.html" ><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/implicit_failure_make_error_code_copy_constructor.html" ><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/implicit_failure_make_error_code_move_constructor.html" ><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/implicit_failure_make_exception_ptr_copy_constructor.html" ><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/implicit_failure_make_exception_ptr_move_constructor.html" ><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></a>
+<p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p></li></ol>
+
+<h4 id="observers">Observers</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_result/operator_bool.html" ><code>explicit operator bool() const noexcept</code></a>
+<p>Returns true if a value is present. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_result/has_value.html" ><code>bool has_value() const noexcept</code></a>
+<p>Returns true if a value is present. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_result/has_error.html" ><code>bool has_error() const noexcept</code></a>
+<p>Returns true if an error is present. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_result/has_exception.html" ><code>bool has_exception() const noexcept</code></a>
+<p>Always returns false for <code>basic_result</code>. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_result/has_failure.html" ><code>bool has_failure() const noexcept</code></a>
+<p>Returns true if there is either an error or an exception. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_result/has_lost_consistency.html" ><code>bool has_lost_consistency() const noexcept</code></a>
+<p>Returns true if a preceding swap involving this object failed to preserve the strong guarantee. Constexpr, never throws.</p><li>
+    <a href="../../reference/types/basic_result/assume_value_lvalue.html" ><code>value_type &amp;assume_value() &amp; noexcept</code></a>
+<p>Narrow contract lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_result/assume_value_lvalue_const.html" ><code>const value_type &amp;assume_value() const &amp; noexcept</code></a>
+<p>Narrow contract const lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_result/assume_value_rvalue.html" ><code>value_type &amp;&amp;assume_value() &amp;&amp; noexcept</code></a>
+<p>Narrow contract rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_result/assume_value_rvalue_const.html" ><code>const value_type &amp;&amp;assume_value() const &amp;&amp; noexcept</code></a>
+<p>Narrow contract const rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_result/value_lvalue.html" ><code>value_type &amp;value() &amp;</code></a>
+<p>Wide contract lvalue reference observer of any value present. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_result/value_lvalue_const.html" ><code>const value_type &amp;value() const &amp;</code></a>
+<p>Wide contract const lvalue reference observer of any value present. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_result/value_rvalue.html" ><code>value_type &amp;&amp;value() &amp;&amp;</code></a>
+<p>Wide contract rvalue reference observer of any value present. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_result/value_rvalue_const.html" ><code>const value_type &amp;&amp;value() const &amp;&amp;</code></a>
+<p>Wide contract const rvalue reference observer of any value present. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_result/assume_error_lvalue.html" ><code>error_type &amp;assume_error() &amp; noexcept</code></a>
+<p>Narrow contract lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_result/assume_error_lvalue_const.html" ><code>const error_type &amp;assume_error() const &amp; noexcept</code></a>
+<p>Narrow contract const lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_result/assume_error_rvalue.html" ><code>error_type &amp;&amp;assume_error() &amp;&amp; noexcept</code></a>
+<p>Narrow contract rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_result/assume_error_rvalue_const.html" ><code>const error_type &amp;&amp;assume_error() const &amp;&amp; noexcept</code></a>
+<p>Narrow contract const rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
+    <a href="../../reference/types/basic_result/error_lvalue.html" ><code>error_type &amp;error() &amp;</code></a>
+<p>Wide contract lvalue reference observer of the stored error. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_result/error_lvalue_const.html" ><code>const error_type &amp;error() const &amp;</code></a>
+<p>Wide contract const lvalue reference observer of the stored error. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_result/error_rvalue.html" ><code>error_type &amp;&amp;error() &amp;&amp;</code></a>
+<p>Wide contract rvalue reference observer of the stored error. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_result/error_rvalue_const.html" ><code>const error_type &amp;&amp;error() const &amp;&amp;</code></a>
+<p>Wide contract const rvalue reference observer of the stored error. Constexpr propagating.</p><li>
+    <a href="../../reference/types/basic_result/as_failure_lvalue.html" ><code>auto as_failure() const &amp;</code></a>
+<p>Return the output from free function <code>failure()</code> containing a copy of any errored state.</p></li></ol>
+
+<h4 id="modifiers">Modifiers</h4>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_result/swap.html" ><code>void swap(basic_result &amp;)</code></a>
+<p>Swap one basic_result with another, with the strong guarantee. Noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/as_failure_rvalue.html" ><code>auto as_failure() &amp;&amp;</code></a>
+<p>Return the output from free function <code>failure()</code> containing a move of any errored state.</p></li></ol>
+
+<h4 id="comparisons">Comparisons</h4>
+
+<p>See above for why <code>LessThanComparable</code> is not implemented.</p>
+
+<ol class="children children-li"><li>
+    <a href="../../reference/types/basic_result/equality_basic_result.html" ><code>bool operator==(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
+<p>Returns true if this result compares equal to the other result. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/inequality_success_type.html" ><code>bool operator==(const success_type&lt;A&gt; &amp;) const</code></a>
+<p>Returns true if this result compares equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/equality_failure_type.html" ><code>bool operator==(const failure_type&lt;A, void&gt; &amp;) const</code></a>
+<p>Returns true if this result compares equal to the failure type sugar. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/inequality_basic_result.html" ><code>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
+<p>Returns true if this result does not compare equal to the other result. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/equality_success_type.html" ><code>bool operator!=(const success_type&lt;A&gt; &amp;) const</code></a>
+<p>Returns true if this result does not compare equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
+    <a href="../../reference/types/basic_result/inequality_failure_type.html" ><code>bool operator!=(const failure_type&lt;A, void&gt; &amp;) const</code></a>
+<p>Returns true if this result does not compare equal to the failure type sugar. Constexpr and noexcept propagating.</p></li></ol>
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/basic_outcome/as_failure_rvalue.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types/basic_result/default.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/as_failure_lvalue.html b/doc/html/reference/types/basic_result/as_failure_lvalue.html
new file mode 100644
index 000000000..dd5b15983
--- /dev/null
+++ b/doc/html/reference/types/basic_result/as_failure_lvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>auto as_failure() const &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/swap.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/as_failure_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>auto as_failure() const &amp;</code></h1></div></div></div>
+  <p>Return the output from free function <a href="../../../reference/functions/failure.html" class="api-reference"><code>auto failure(T &amp;&amp;, ...)</code></a>
+ containing a copy of any errored state. The error state is accessed using <a href="../../../reference/types/basic_outcome/assume_error_lvalue_const.html" class="api-reference"><code>const error_type &amp;assume_error() const &amp; noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Whatever that of <code>error_type</code>&rsquo;s copy constructor is.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/swap.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/as_failure_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/as_failure_rvalue.html b/doc/html/reference/types/basic_result/as_failure_rvalue.html
new file mode 100644
index 000000000..07a9a2066
--- /dev/null
+++ b/doc/html/reference/types/basic_result/as_failure_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>auto as_failure() &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/as_failure_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/bad_outcome_access.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>auto as_failure() &amp;&amp;</code></h1></div></div></div>
+  <p>Return the output from free function <a href="../../../reference/functions/failure.html" class="api-reference"><code>auto failure(T &amp;&amp;, ...)</code></a>
+ containing a move from any errored state, thus leaving the result&rsquo;s error value in a moved-from state. Depending on the choice of <code>error_type</code>, this function may therefore be destructive. The error state is accessed using <a href="../../../reference/types/basic_outcome/assume_error_rvalue.html" class="api-reference"><code>error_type &amp;&amp;assume_error() &amp;&amp; noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Whatever that of <code>error_type</code>&rsquo;s move constructor is.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: January 24, 2019 at 01:15:16 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/as_failure_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/bad_outcome_access.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/assume_error_lvalue.html b/doc/html/reference/types/basic_result/assume_error_lvalue.html
new file mode 100644
index 000000000..7ce38b850
--- /dev/null
+++ b/doc/html/reference/types/basic_result/assume_error_lvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>error_type &amp;assume_error() &amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/value_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_error_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>error_type &amp;assume_error() &amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract lvalue reference observer of the stored error. <code>NoValuePolicy::narrow_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_error_check()</code> does that.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/value_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_error_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/assume_error_lvalue_const.html b/doc/html/reference/types/basic_result/assume_error_lvalue_const.html
new file mode 100644
index 000000000..62769f96d
--- /dev/null
+++ b/doc/html/reference/types/basic_result/assume_error_lvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const error_type &amp;assume_error() const &amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_error_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_error_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const error_type &amp;assume_error() const &amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract const lvalue reference observer of the stored error. <code>NoValuePolicy::narrow_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_error_check()</code> does that.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_error_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_error_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/assume_error_rvalue.html b/doc/html/reference/types/basic_result/assume_error_rvalue.html
new file mode 100644
index 000000000..72b39e170
--- /dev/null
+++ b/doc/html/reference/types/basic_result/assume_error_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>error_type &amp;&amp;assume_error() &amp;&amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_error_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_error_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>error_type &amp;&amp;assume_error() &amp;&amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract rvalue reference observer of the stored error. <code>NoValuePolicy::narrow_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_error_check()</code> does that.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_error_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_error_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/assume_error_rvalue_const.html b/doc/html/reference/types/basic_result/assume_error_rvalue_const.html
new file mode 100644
index 000000000..31d05acfb
--- /dev/null
+++ b/doc/html/reference/types/basic_result/assume_error_rvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const error_type &amp;&amp;assume_error() const &amp;&amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_error_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/error_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const error_type &amp;&amp;assume_error() const &amp;&amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract const rvalue reference observer of the stored error. <code>NoValuePolicy::narrow_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs unless <code>NoValuePolicy::narrow_error_check()</code> does that.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_error_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
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diff --git a/doc/html/reference/types/basic_result/assume_value_lvalue.html b/doc/html/reference/types/basic_result/assume_value_lvalue.html
new file mode 100644
index 000000000..0e42153d3
--- /dev/null
+++ b/doc/html/reference/types/basic_result/assume_value_lvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_type &amp;assume_value() &amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/has_lost_consistency.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_value_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_type &amp;assume_value() &amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract lvalue reference observer of any value present. <code>NoValuePolicy::narrow_value_check()</code> is first invoked, then the reference to the value is returned. The convention is that hard undefined behaviour occurs if no value is actually present, however <code>NoValuePolicy::narrow_value_check()</code> can do something to avoid that.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/has_lost_consistency.html"><img src="../../../images/prev.png" alt="Prev"></a>
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+</html>
diff --git a/doc/html/reference/types/basic_result/assume_value_lvalue_const.html b/doc/html/reference/types/basic_result/assume_value_lvalue_const.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/basic_result/assume_value_lvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const value_type &amp;assume_value() const &amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_value_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_value_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const value_type &amp;assume_value() const &amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract const lvalue reference observer of any value present. <code>NoValuePolicy::narrow_value_check()</code> is first invoked, then the reference to the value is returned. The convention is that hard undefined behaviour occurs if no value is actually present, however <code>NoValuePolicy::narrow_value_check()</code> can do something to avoid that.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_value_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/types/basic_result/assume_value_rvalue.html b/doc/html/reference/types/basic_result/assume_value_rvalue.html
new file mode 100644
index 000000000..890dca5cf
--- /dev/null
+++ b/doc/html/reference/types/basic_result/assume_value_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_type &amp;&amp;assume_value() &amp;&amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_value_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_value_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_type &amp;&amp;assume_value() &amp;&amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract rvalue reference observer of any value present. <code>NoValuePolicy::narrow_value_check()</code> is first invoked, then the reference to the value is returned. The convention is that hard undefined behaviour occurs if no value is actually present, however <code>NoValuePolicy::narrow_value_check()</code> can do something to avoid that.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_value_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_value_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/assume_value_rvalue_const.html b/doc/html/reference/types/basic_result/assume_value_rvalue_const.html
new file mode 100644
index 000000000..2a5dbfbe6
--- /dev/null
+++ b/doc/html/reference/types/basic_result/assume_value_rvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const value_type &amp;&amp;assume_value() const &amp;&amp; noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_value_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/value_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const value_type &amp;&amp;assume_value() const &amp;&amp; noexcept</code></h1></div></div></div>
+  <p>Narrow contract const rvalue reference observer of any value present. <code>NoValuePolicy::narrow_value_check()</code> is first invoked, then the reference to the value is returned. The convention is that hard undefined behaviour occurs if no value is actually present, however <code>NoValuePolicy::narrow_value_check()</code> can do something to avoid that.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: An exception is never thrown.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_value_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/value_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
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diff --git a/doc/html/reference/types/basic_result/copy_assignment.html b/doc/html/reference/types/basic_result/copy_assignment.html
new file mode 100644
index 000000000..66542893d
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+++ b/doc/html/reference/types/basic_result/copy_assignment.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result &amp;operator=(const basic_result &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/move_assignment.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/destructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result &amp;operator=(const basic_result &amp;)</code></h1></div></div></div>
+  <p>Copy assignment.</p>
+
+<p><em>Requires</em>: that <code>value_type</code> and <code>error_type</code> both implement copy assignment.</p>
+
+<p><em>Complexity</em>: If the <code>value_type</code> for both is present, uses <code>value_type</code>&rsquo;s copy assignment operator, else either destructs or copy constructs <code>value_type</code> as appropriate. <code>error_type</code>&rsquo;s copy assignment operator is always used. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/move_assignment.html"><img src="../../../images/prev.png" alt="Prev"></a>
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+</html>
diff --git a/doc/html/reference/types/basic_result/copy_constructor.html b/doc/html/reference/types/basic_result/copy_constructor.html
new file mode 100644
index 000000000..e0f488134
--- /dev/null
+++ b/doc/html/reference/types/basic_result/copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(const basic_result &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(const basic_result &amp;)</code></h1></div></div></div>
+  <p>Copy constructor.</p>
+
+<p><em>Requires</em>: that <code>value_type</code> and <code>error_type</code> both implement a copy constructor.</p>
+
+<p><em>Complexity</em>: Same as for <code>value_type</code>&rsquo;s and <code>error_type</code>&rsquo;s copy constructors. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/reference/types/basic_result/default.html b/doc/html/reference/types/basic_result/default.html
new file mode 100644
index 000000000..3bc391415
--- /dev/null
+++ b/doc/html/reference/types/basic_result/default.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result() = delete - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result() = delete</code></h1></div></div></div>
+  <p>The default constructor for basic result is always disabled.</p>
+
+
+        </div><p><small>Last revised: December 15, 2018 at 17:49:37 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/reference/types/basic_result/destructor.html b/doc/html/reference/types/basic_result/destructor.html
new file mode 100644
index 000000000..82439dd0d
--- /dev/null
+++ b/doc/html/reference/types/basic_result/destructor.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>~basic_result() - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/copy_assignment.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/disabling_catchall.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>~basic_result()</code></h1></div></div></div>
+  <p>Destructor.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Same as for <code>value_type</code>&rsquo;s and <code>error_type</code>&rsquo;s destructors. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 15, 2018 at 17:49:37 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/copy_assignment.html"><img src="../../../images/prev.png" alt="Prev"></a>
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+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/disabling_catchall.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
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diff --git a/doc/html/reference/types/basic_result/disabling_catchall.html b/doc/html/reference/types/basic_result/disabling_catchall.html
new file mode 100644
index 000000000..b1ec74001
--- /dev/null
+++ b/doc/html/reference/types/basic_result/disabling_catchall.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(Args&hellip;) = delete - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+<a accesskey="p" href="../../../reference/types/basic_result/destructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/disabling_implicit_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(Args...) = delete</code></h1></div></div></div>
+  <p>Disabling catchall constructor used to give useful diagnostic error when trying to use non-inplace constructors when <code>predicate::constructors_enabled</code> is false.</p>
+
+<p><em>Requires</em>: <code>predicate::constructors_enabled</code> is false.</p>
+
+<p><em>Complexity</em>: N/A.</p>
+
+
+        </div><p><small>Last revised: December 15, 2018 at 17:49:37 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/destructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/disabling_implicit_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/disabling_implicit_constructor.html b/doc/html/reference/types/basic_result/disabling_implicit_constructor.html
new file mode 100644
index 000000000..a8c6eb268
--- /dev/null
+++ b/doc/html/reference/types/basic_result/disabling_implicit_constructor.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(X &amp;&amp;) = delete - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/disabling_catchall.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_value_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(X &amp;&amp;) = delete</code></h1></div></div></div>
+  <p>Disabling implicit constructor used to give useful diagnostic error when trying to use implicit constructors when <code>predicate::implicit_constructors_enabled</code> is false.</p>
+
+<p><em>Requires</em>: <code>predicate::implicit_constructors_enabled</code> is false.</p>
+
+<p><em>Complexity</em>: N/A.</p>
+
+
+        </div><p><small>Last revised: December 15, 2018 at 17:49:37 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/disabling_catchall.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_value_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/equality_basic_result.html b/doc/html/reference/types/basic_result/equality_basic_result.html
new file mode 100644
index 000000000..fa5f54f77
--- /dev/null
+++ b/doc/html/reference/types/basic_result/equality_basic_result.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator==(const basic_result&lt;A, B, C&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/error_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/inequality_success_type.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator==(const basic_result&lt;A, B, C&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this result compares equal to the other result. Comparison is done using <code>operator==</code> on either <code>value_type</code> or <code>error_type</code> if the currently chosen state is the same for both results, otherwise false is returned.</p>
+
+<p><em>Requires</em>: <code>operator==</code> must be a valid expression between <code>value_type</code> and <code>A</code>, and between <code>error_type</code> and <code>B</code>. If <code>value_type</code> is <code>void</code>, then so must be <code>A</code>; similarly for <code>error_type</code> and <code>B</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator==</code> have. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+<p><em>Free function alias</em>: There is a free function <code>bool operator==(const basic_result&lt;A, B, C&gt; &amp;, const basic_outcome&lt;A, B, C, D&gt; &amp;)</code> which forwards perfectly to this function, by reversing the operands.</p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 15:52:57 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/error_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/inequality_success_type.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/equality_failure_type.html b/doc/html/reference/types/basic_result/equality_failure_type.html
new file mode 100644
index 000000000..016b6d4bc
--- /dev/null
+++ b/doc/html/reference/types/basic_result/equality_failure_type.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator==(const failure_type&lt;A, void&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/inequality_success_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/inequality_basic_result.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator==(const failure_type&lt;A, void&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this result is unsuccessful and its error compares equal to the error in the failure type sugar. Comparison is done using <code>operator==</code> on <code>error_type</code> and <code>A</code>. If <code>A</code> is <code>void</code>, this call aliases <a href="../../../reference/types/basic_outcome/has_error.html" class="api-reference"><code>bool has_error() const noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: <code>operator==</code> must be a valid expression between <code>error_type</code> and <code>A</code>, or <code>A</code> is <code>void</code>. If <code>error_type</code> is <code>void</code>, then so must be <code>A</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator==</code> has. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/inequality_success_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/inequality_basic_result.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/equality_success_type.html b/doc/html/reference/types/basic_result/equality_success_type.html
new file mode 100644
index 000000000..7688aaa03
--- /dev/null
+++ b/doc/html/reference/types/basic_result/equality_success_type.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator!=(const success_type&lt;A&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/inequality_basic_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/inequality_failure_type.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator!=(const success_type&lt;A&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this result is not successful or its value does not compares equal to the value in the success type sugar. Comparison is done using <code>operator!=</code> on <code>value_type</code> and <code>A</code>. If <code>A</code> is <code>void</code>, this call aliases <a href="../../../reference/types/basic_outcome/has_error.html" class="api-reference"><code>bool has_error() const noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: <code>operator!=</code> must be a valid expression between <code>value_type</code> and <code>A</code>, or <code>A</code> is <code>void</code>. If <code>value_type</code> is <code>void</code>, then so must be <code>A</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator!=</code> has. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: January 20, 2019 at 16:02:33 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/inequality_basic_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/inequality_failure_type.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/error_lvalue.html b/doc/html/reference/types/basic_result/error_lvalue.html
new file mode 100644
index 000000000..64abe0d6d
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+++ b/doc/html/reference/types/basic_result/error_lvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>error_type &amp;error() &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_error_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/error_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>error_type &amp;error() &amp;</code></h1></div></div></div>
+  <p>Wide contract lvalue reference observer of the stored error. <code>NoValuePolicy::wide_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_error_check()</code> returns.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_error_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/error_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/error_lvalue_const.html b/doc/html/reference/types/basic_result/error_lvalue_const.html
new file mode 100644
index 000000000..486a5e4d4
--- /dev/null
+++ b/doc/html/reference/types/basic_result/error_lvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const error_type &amp;error() const &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/error_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/error_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const error_type &amp;error() const &amp;</code></h1></div></div></div>
+  <p>Wide contract const lvalue reference observer of the stored error. <code>NoValuePolicy::wide_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_error_check()</code> returns.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/error_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/error_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/error_rvalue.html b/doc/html/reference/types/basic_result/error_rvalue.html
new file mode 100644
index 000000000..9d92e77da
--- /dev/null
+++ b/doc/html/reference/types/basic_result/error_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>error_type &amp;&amp;error() &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/error_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/error_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>error_type &amp;&amp;error() &amp;&amp;</code></h1></div></div></div>
+  <p>Wide contract rvalue reference observer of the stored error. <code>NoValuePolicy::wide_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_error_check()</code> returns.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/error_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/error_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/error_rvalue_const.html b/doc/html/reference/types/basic_result/error_rvalue_const.html
new file mode 100644
index 000000000..e68e5e12f
--- /dev/null
+++ b/doc/html/reference/types/basic_result/error_rvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const error_type &amp;&amp;error() const &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/error_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/equality_basic_result.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const error_type &amp;&amp;error() const &amp;&amp;</code></h1></div></div></div>
+  <p>Wide contract const rvalue reference observer of the stored error. <code>NoValuePolicy::wide_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs if <code>NoValuePolicy::wide_error_check()</code> returns.</p>
+
+<p>Note that if <code>error_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_error_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/error_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/equality_basic_result.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_copy_converting_constructor.html b/doc/html/reference/types/basic_result/explicit_copy_converting_constructor.html
new file mode 100644
index 000000000..f02e3d545
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_copy_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></h1></div></div></div>
+  <p>Explicit converting copy constructor from compatible <code>basic_result</code>. Calls <a href="../../../reference/policies/base/on_result_copy_construction.html" class="api-reference"><code>void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;R, S, P&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the copy constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_inplace_error_constructor.html b/doc/html/reference/types/basic_result/explicit_inplace_error_constructor.html
new file mode 100644
index 000000000..f1a856a32
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_inplace_error_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(in_place_type_t&lt;error_type_if_enabled&gt;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_inplace_value_constructor_il.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_inplace_error_constructor_il.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(in_place_type_t&lt;error_type_if_enabled&gt;, Args ...)</code></h1></div></div></div>
+  <p>Explicit inplace error constructor. Calls <a href="../../../reference/policies/base/on_result_in_place_construction.html" class="api-reference"><code>void on_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ with <code>this</code>, <code>in_place_type&lt;error_type&gt;</code> and <code>Args ...</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_inplace_error_constructor&lt;Args ...&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_inplace_value_constructor_il.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_inplace_error_constructor_il.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_inplace_error_constructor_il.html b/doc/html/reference/types/basic_result/explicit_inplace_error_constructor_il.html
new file mode 100644
index 000000000..ea398275e
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_inplace_error_constructor_il.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(in_place_type_t&lt;error_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_inplace_error_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_inplace_value_error_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(in_place_type_t&lt;error_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></h1></div></div></div>
+  <p>Explicit inplace error constructor. Calls <a href="../../../reference/policies/base/on_result_in_place_construction.html" class="api-reference"><code>void on_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ with <code>this</code>, <code>in_place_type&lt;error_type&gt;</code>, <code>std::initializer_list&lt;U&gt;</code> and <code>Args ...</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_inplace_error_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>std::initializer_list&lt;U&gt;, Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_inplace_error_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_inplace_value_error_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_inplace_value_constructor.html b/doc/html/reference/types/basic_result/explicit_inplace_value_constructor.html
new file mode 100644
index 000000000..b168b9700
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_inplace_value_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(in_place_type_t&lt;value_type_if_enabled&gt;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_make_exception_ptr_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_inplace_value_constructor_il.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(in_place_type_t&lt;value_type_if_enabled&gt;, Args ...)</code></h1></div></div></div>
+  <p>Explicit inplace value constructor. Calls <a href="../../../reference/policies/base/on_result_in_place_construction.html" class="api-reference"><code>void on_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ with <code>this</code>, <code>in_place_type&lt;value_type&gt;</code> and <code>Args ...</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_inplace_value_constructor&lt;Args ...&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>value_type</code> constructor which accepts <code>Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_make_exception_ptr_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_inplace_value_constructor_il.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_inplace_value_constructor_il.html b/doc/html/reference/types/basic_result/explicit_inplace_value_constructor_il.html
new file mode 100644
index 000000000..5cea59369
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_inplace_value_constructor_il.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(in_place_type_t&lt;value_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_inplace_value_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_inplace_error_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(in_place_type_t&lt;value_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></h1></div></div></div>
+  <p>Explicit inplace value constructor. Calls <a href="../../../reference/policies/base/on_result_in_place_construction.html" class="api-reference"><code>void on_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+ with <code>this</code>, <code>in_place_type&lt;value_type&gt;</code>, &lsquo;std::initializer_list<U>&rsquo; and <code>Args ...</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_inplace_value_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>value_type</code> constructor which accepts <code>std::initializer_list&lt;U&gt;, Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_inplace_value_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_inplace_error_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_make_error_code_copy_converting_constructor.html b/doc/html/reference/types/basic_result/explicit_make_error_code_copy_converting_constructor.html
new file mode 100644
index 000000000..475120129
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_make_error_code_copy_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_make_error_code_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></h1></div></div></div>
+  <p>Explicit converting copy constructor from compatible <code>basic_result</code>. Calls <a href="../../../reference/policies/base/on_result_copy_construction.html" class="api-reference"><code>void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_error_code_compatible_conversion&lt;R, S, P&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the copy constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_make_error_code_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_make_error_code_move_converting_constructor.html b/doc/html/reference/types/basic_result/explicit_make_error_code_move_converting_constructor.html
new file mode 100644
index 000000000..5d0c5a057
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_make_error_code_move_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_make_error_code_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_make_exception_ptr_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Explicit converting move constructor from compatible <code>basic_result</code>. Calls <a href="../../../reference/policies/base/on_result_move_construction.html" class="api-reference"><code>void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_error_code_compatible_conversion&lt;R, S, P&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the move constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_make_error_code_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_make_exception_ptr_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_make_exception_ptr_copy_converting_constructor.html b/doc/html/reference/types/basic_result/explicit_make_exception_ptr_copy_converting_constructor.html
new file mode 100644
index 000000000..413db1570
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_make_exception_ptr_copy_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_make_error_code_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_make_exception_ptr_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></h1></div></div></div>
+  <p>Explicit converting copy constructor from compatible <code>basic_result</code>. Calls <a href="../../../reference/policies/base/on_result_copy_construction.html" class="api-reference"><code>void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;R, S, P&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the copy constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_make_error_code_move_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_make_exception_ptr_move_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_make_exception_ptr_move_converting_constructor.html b/doc/html/reference/types/basic_result/explicit_make_exception_ptr_move_converting_constructor.html
new file mode 100644
index 000000000..231537081
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_make_exception_ptr_move_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_make_exception_ptr_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_inplace_value_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Explicit converting move constructor from compatible <code>basic_result</code>. Calls <a href="../../../reference/policies/base/on_result_move_construction.html" class="api-reference"><code>void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;R, S, P&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the move constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_make_exception_ptr_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_inplace_value_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_move_converting_constructor.html b/doc/html/reference/types/basic_result/explicit_move_converting_constructor.html
new file mode 100644
index 000000000..f3b92ed04
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_move_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_make_error_code_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Explicit converting move constructor from compatible <code>basic_result</code>. Calls <a href="../../../reference/policies/base/on_result_move_construction.html" class="api-reference"><code>void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and the input.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;R, S, P&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for the move constructors of the underlying types. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_copy_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_make_error_code_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/explicit_valueorerror_converting_constructor.html b/doc/html/reference/types/basic_result/explicit_valueorerror_converting_constructor.html
new file mode 100644
index 000000000..2331d65f1
--- /dev/null
+++ b/doc/html/reference/types/basic_result/explicit_valueorerror_converting_constructor.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit basic_result(concepts::value_or_error&lt;T, E&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_error_condition_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit basic_result(concepts::value_or_error&lt;T, E&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Explicit converting constructor from <a href="../../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" class="api-reference"><code>concepts::value_or_error&lt;T, E&gt;</code></a>
+ concept matching types. Delegates to the <code>basic_result</code> move constructor.</p>
+
+<p><em>Requires</em>: <code>convert::</code><a href="../../../reference/converters/value_or_error.html" class="api-reference"><code>value_or_error&lt;T, U&gt;</code></a>
+ has an available call operator, and if the input is a <code>basic_result</code> or <code>basic_outcome</code>, then <code>convert::value_or_error&lt;&gt;</code> has enabled those inputs for that <code>convert::value_or_error&lt;&gt;</code> specialisation.</p>
+
+<p><em>Complexity</em>: Same as for the copy or move constructor from the input&rsquo;s <code>.value()</code> or <code>.error()</code> respectively. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_error_condition_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_copy_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/has_error.html b/doc/html/reference/types/basic_result/has_error.html
new file mode 100644
index 000000000..aa9f6f772
--- /dev/null
+++ b/doc/html/reference/types/basic_result/has_error.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool has_error() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/has_value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/has_exception.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool has_error() const noexcept</code></h1></div></div></div>
+  <p>Returns true if an error is present. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 20, 2019 at 16:02:33 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/has_value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/has_exception.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/has_exception.html b/doc/html/reference/types/basic_result/has_exception.html
new file mode 100644
index 000000000..32818ce4b
--- /dev/null
+++ b/doc/html/reference/types/basic_result/has_exception.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool has_exception() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/has_error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/has_failure.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool has_exception() const noexcept</code></h1></div></div></div>
+  <p>Always returns false for <code>basic_result</code>. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 20, 2019 at 16:02:33 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/has_error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/has_failure.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/has_failure.html b/doc/html/reference/types/basic_result/has_failure.html
new file mode 100644
index 000000000..e358ab367
--- /dev/null
+++ b/doc/html/reference/types/basic_result/has_failure.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool has_failure() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/has_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/has_lost_consistency.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool has_failure() const noexcept</code></h1></div></div></div>
+  <p>Returns true if there is either an error or an exception. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 20, 2019 at 16:02:33 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/has_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/has_lost_consistency.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/has_lost_consistency.html b/doc/html/reference/types/basic_result/has_lost_consistency.html
new file mode 100644
index 000000000..b1c1cb0d7
--- /dev/null
+++ b/doc/html/reference/types/basic_result/has_lost_consistency.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool has_lost_consistency() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/has_failure.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_value_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool has_lost_consistency() const noexcept</code></h1></div></div></div>
+  <p>Returns true if a preceding swap involving this object failed to preserve the strong guarantee. Constexpr where possible.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: June 23, 2019 at 16:48:29 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/has_failure.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_value_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/has_value.html b/doc/html/reference/types/basic_result/has_value.html
new file mode 100644
index 000000000..79cd45a4d
--- /dev/null
+++ b/doc/html/reference/types/basic_result/has_value.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool has_value() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/operator_bool.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/has_error.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool has_value() const noexcept</code></h1></div></div></div>
+  <p>Returns true if a value is present. Constexpr where possible. Alias for <a href="../../../reference/types/basic_outcome/operator_bool.html" class="api-reference"><code>explicit operator bool() const noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 20, 2019 at 16:02:33 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/operator_bool.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/has_error.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_error_condition_converting_constructor.html b/doc/html/reference/types/basic_result/implicit_error_condition_converting_constructor.html
new file mode 100644
index 000000000..b1d100e6e
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_error_condition_converting_constructor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(ErrorCondEnum &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_error_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(ErrorCondEnum &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit <code>error_type</code> from <code>ErrorCondEnum</code> constructor. Calls <a href="../../../reference/policies/base/on_result_construction.html" class="api-reference"><code>void on_result_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>ErrorCondEnum</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_error_condition_converting_constructor&lt;R&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for <code>error_type</code>&rsquo;s copy or move constructor from the result of <code>make_error_code(ErrorCondEnum)</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the input is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_error_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_error_converting_constructor.html b/doc/html/reference/types/basic_result/implicit_error_converting_constructor.html
new file mode 100644
index 000000000..27395115a
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_error_converting_constructor.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(S &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_value_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_error_condition_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(S &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit <code>error_type</code> constructor. Calls <a href="../../../reference/policies/base/on_result_construction.html" class="api-reference"><code>void on_result_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>S</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_error_converting_constructor&lt;S&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for <code>error_type</code>&rsquo;s copy or move constructor. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_value_converting_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_error_condition_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_failure_copy_constructor.html b/doc/html/reference/types/basic_result/implicit_failure_copy_constructor.html
new file mode 100644
index 000000000..8b80e1e4c
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_failure_copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(const failure_type&lt;T&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_success_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></h1></div></div></div>
+  <p>Implicit error-from-failure-type-sugar copy constructor used to disambiguate the construction of the error type.
+Note that if <code>T = void</code>, <code>error_type</code> will be default constructed.  Calls <a href="../../../reference/policies/base/on_result_copy_construction.html" class="api-reference"><code>void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>const failure_type&lt;T&gt; &amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>T</code>, or the <code>error_type</code> default constructor if <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_success_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_failure_make_error_code_copy_constructor.html b/doc/html/reference/types/basic_result/implicit_failure_make_error_code_copy_constructor.html
new file mode 100644
index 000000000..f3fa3bde5
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_failure_make_error_code_copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(const failure_type&lt;T&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_make_error_code_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></h1></div></div></div>
+  <p>Implicit error-from-failure-type-sugar copy constructor used to disambiguate the construction of the error type.
+Note that if <code>T = void</code>, <code>error_type</code> will be default constructed.  Calls <a href="../../../reference/policies/base/on_result_copy_construction.html" class="api-reference"><code>void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>const failure_type&lt;T&gt; &amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_error_code_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>T</code>, or the <code>error_type</code> default constructor if <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_make_error_code_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_failure_make_error_code_move_constructor.html b/doc/html/reference/types/basic_result/implicit_failure_make_error_code_move_constructor.html
new file mode 100644
index 000000000..f8fc1c816
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_failure_make_error_code_move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(failure_type&lt;T&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_make_error_code_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_make_exception_ptr_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit error-from-failure-type-sugar move constructor used to disambiguate the construction of the error type.
+Note that if <code>T = void</code>, <code>error_type</code> will be default constructed.  Calls <a href="../../../reference/policies/base/on_result_move_construction.html" class="api-reference"><code>void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>failure_type&lt;T&gt; &amp;&amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_error_code_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>T</code>, or the <code>error_type</code> default constructor if <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_make_error_code_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_make_exception_ptr_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_failure_make_exception_ptr_copy_constructor.html b/doc/html/reference/types/basic_result/implicit_failure_make_exception_ptr_copy_constructor.html
new file mode 100644
index 000000000..07c21faa2
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_failure_make_exception_ptr_copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(const failure_type&lt;T&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_make_error_code_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_make_exception_ptr_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></h1></div></div></div>
+  <p>Implicit error-from-failure-type-sugar copy constructor used to disambiguate the construction of the error type.
+Note that if <code>T = void</code>, <code>error_type</code> will be default constructed.  Calls <a href="../../../reference/policies/base/on_result_copy_construction.html" class="api-reference"><code>void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>const failure_type&lt;T&gt; &amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>T</code>, or the <code>error_type</code> default constructor if <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_make_error_code_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_make_exception_ptr_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_failure_make_exception_ptr_move_constructor.html b/doc/html/reference/types/basic_result/implicit_failure_make_exception_ptr_move_constructor.html
new file mode 100644
index 000000000..2c895ac55
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_failure_make_exception_ptr_move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(failure_type&lt;T&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_make_exception_ptr_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/operator_bool.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit error-from-failure-type-sugar move constructor used to disambiguate the construction of the error type.
+Note that if <code>T = void</code>, <code>error_type</code> will be default constructed.  Calls <a href="../../../reference/policies/base/on_result_move_construction.html" class="api-reference"><code>void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>failure_type&lt;T&gt; &amp;&amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>T</code>, or the <code>error_type</code> default constructor if <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_make_exception_ptr_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/operator_bool.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_failure_move_constructor.html b/doc/html/reference/types/basic_result/implicit_failure_move_constructor.html
new file mode 100644
index 000000000..bf24ee1b7
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_failure_move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(failure_type&lt;T&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_make_error_code_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit error-from-failure-type-sugar move constructor used to disambiguate the construction of the error type.
+Note that if <code>T = void</code>, <code>error_type</code> will be default constructed.  Calls <a href="../../../reference/policies/base/on_result_move_construction.html" class="api-reference"><code>void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>failure_type&lt;T&gt; &amp;&amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>.</p>
+
+<p><em>Complexity</em>: Same as for the <code>error_type</code> constructor which accepts <code>T</code>, or the <code>error_type</code> default constructor if <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_make_error_code_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_inplace_value_error_constructor.html b/doc/html/reference/types/basic_result/implicit_inplace_value_error_constructor.html
new file mode 100644
index 000000000..dff0c9967
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_inplace_value_error_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(A1 &amp;&amp;, A2 &amp;&amp;, Args &hellip;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_inplace_error_constructor_il.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_success_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(A1 &amp;&amp;, A2 &amp;&amp;, Args ...)</code></h1></div></div></div>
+  <p>Implicit inplace value or error constructor. Delegates to an appropriate explicit inplace constructor depending on input.</p>
+
+<p><em>Requires</em>: predicate::enable_inplace_value_error_constructor<A1, A2, Args ...>` is true.</p>
+
+<p><em>Complexity</em>: Same as for the <code>value_type</code> or <code>error_type</code> constructor which accepts <code>A1, A2, Args ...</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the state of the Args is left indeterminate.</p>
+
+
+        </div><p><small>Last revised: January 17, 2019 at 21:24:36 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/explicit_inplace_error_constructor_il.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_success_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_success_copy_constructor.html b/doc/html/reference/types/basic_result/implicit_success_copy_constructor.html
new file mode 100644
index 000000000..78f57a09c
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_success_copy_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(const success_type&lt;T&gt; &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_inplace_value_error_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_success_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(const success_type&lt;T&gt; &amp;)</code></h1></div></div></div>
+  <p>Implicit value-from-success-type-sugar copy constructor used to disambiguate the construction of the value type.
+Note that if <code>T = void</code>, <code>value_type</code> will be default constructed.  Calls <a href="../../../reference/policies/base/on_result_copy_construction.html" class="api-reference"><code>void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>const success_type&lt;T&gt; &amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>.</p>
+
+<p><em>Complexity</em>: Same as for the <code>value_type</code> constructor which accepts <code>T</code>, or the <code>value_type</code> default constructor if <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_inplace_value_error_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_success_move_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_success_move_constructor.html b/doc/html/reference/types/basic_result/implicit_success_move_constructor.html
new file mode 100644
index 000000000..81d171d55
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_success_move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(success_type&lt;T&gt; &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_success_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(success_type&lt;T&gt; &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit value-from-success-type-sugar move constructor used to disambiguate the construction of the value type.
+Note that if <code>T = void</code>, <code>value_type</code> will be default constructed.  Calls <a href="../../../reference/policies/base/on_result_move_construction.html" class="api-reference"><code>void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>success_type&lt;T&gt; &amp;&amp;</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>.</p>
+
+<p><em>Complexity</em>: Same as for the <code>value_type</code> constructor which accepts <code>T</code>, or the <code>value_type</code> default constructor if <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_success_copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_failure_copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/implicit_value_converting_constructor.html b/doc/html/reference/types/basic_result/implicit_value_converting_constructor.html
new file mode 100644
index 000000000..4892b6231
--- /dev/null
+++ b/doc/html/reference/types/basic_result/implicit_value_converting_constructor.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(R &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/disabling_implicit_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_error_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(R &amp;&amp;)</code></h1></div></div></div>
+  <p>Implicit <code>value_type</code> constructor. Calls <a href="../../../reference/policies/base/on_result_construction.html" class="api-reference"><code>void on_result_construction(T *, U &amp;&amp;) noexcept</code></a>
+ with <code>this</code> and <code>R</code>.</p>
+
+<p><em>Requires</em>: <code>predicate::enable_value_converting_constructor&lt;R&gt;</code> is true.</p>
+
+<p><em>Complexity</em>: Same as for <code>value_type</code>&rsquo;s copy or move constructor. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+
+        </div><p><small>Last revised: December 17, 2020 at 11:27:06 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/disabling_implicit_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/implicit_error_converting_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/inequality_basic_result.html b/doc/html/reference/types/basic_result/inequality_basic_result.html
new file mode 100644
index 000000000..fbe1fa0e3
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+++ b/doc/html/reference/types/basic_result/inequality_basic_result.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/equality_failure_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/equality_success_type.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this result does not compare equal to the other result. Comparison is done using <code>operator!=</code> on either <code>value_type</code> or <code>error_type</code> if the currently chosen state is the same for both results, otherwise true is returned.</p>
+
+<p><em>Requires</em>: <code>operator!=</code> must be a valid expression between <code>value_type</code> and <code>A</code>, and between <code>error_type</code> and <code>B</code>. If <code>value_type</code> is <code>void</code>, then so must be <code>A</code>; similarly for <code>error_type</code> and <code>B</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator!=</code> have. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+<p><em>Free function alias</em>: There is a free function <code>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;, const basic_outcome&lt;A, B, C, D&gt; &amp;)</code> which forwards perfectly to this function, by reversing the operands.</p>
+
+
+        </div><p><small>Last revised: February 01, 2019 at 15:52:57 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/equality_failure_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/equality_success_type.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/inequality_failure_type.html b/doc/html/reference/types/basic_result/inequality_failure_type.html
new file mode 100644
index 000000000..41518857c
--- /dev/null
+++ b/doc/html/reference/types/basic_result/inequality_failure_type.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator!=(const failure_type&lt;A, void&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/equality_success_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/swap.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator!=(const failure_type&lt;A, void&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this result is successful or its error does not compare equal to the error in the failure type sugar. Comparison is done using <code>operator!=</code> on <code>error_type</code> and <code>A</code>. If <code>A</code> is <code>void</code>, this call aliases <a href="../../../reference/types/basic_outcome/has_value.html" class="api-reference"><code>bool has_value() const noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: <code>operator!=</code> must be a valid expression between <code>error_type</code> and <code>A</code>, or <code>A</code> is <code>void</code>. If <code>error_type</code> is <code>void</code>, then so must be <code>A</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator!=</code> has. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/equality_success_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/swap.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/inequality_success_type.html b/doc/html/reference/types/basic_result/inequality_success_type.html
new file mode 100644
index 000000000..c6de639ca
--- /dev/null
+++ b/doc/html/reference/types/basic_result/inequality_success_type.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>bool operator==(const success_type&lt;A&gt; &amp;) const - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/equality_basic_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/equality_failure_type.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator==(const success_type&lt;A&gt; &amp;) const</code></h1></div></div></div>
+  <p>Returns true if this result is successful and its value compares equal to the value in the success type sugar. Comparison is done using <code>operator==</code> on <code>value_type</code> and <code>A</code>. If <code>A</code> is <code>void</code>, this call aliases <a href="../../../reference/types/basic_outcome/has_value.html" class="api-reference"><code>bool has_value() const noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: <code>operator==</code> must be a valid expression between <code>value_type</code> and <code>A</code>, or <code>A</code> is <code>void</code>. If <code>value_type</code> is <code>void</code>, then so must be <code>A</code>.</p>
+
+<p><em>Complexity</em>: Whatever the underlying <code>operator==</code> has. Constexpr and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: January 20, 2019 at 16:02:33 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/equality_basic_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/equality_failure_type.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/move_assignment.html b/doc/html/reference/types/basic_result/move_assignment.html
new file mode 100644
index 000000000..12ef53a43
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+++ b/doc/html/reference/types/basic_result/move_assignment.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result &amp;operator=(basic_result &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/copy_assignment.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result &amp;operator=(basic_result &amp;&amp;)</code></h1></div></div></div>
+  <p>Move assignment.</p>
+
+<p><em>Requires</em>: that <code>value_type</code> and <code>error_type</code> both implement move assignment.</p>
+
+<p><em>Complexity</em>: If the <code>value_type</code> for both is present, uses <code>value_type</code>&rsquo;s move assignment operator, else either destructs or move constructs <code>value_type</code> as appropriate. <code>error_type</code>&rsquo;s move assignment operator is always used. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/copy_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/copy_assignment.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/move_constructor.html b/doc/html/reference/types/basic_result/move_constructor.html
new file mode 100644
index 000000000..9a40a77fe
--- /dev/null
+++ b/doc/html/reference/types/basic_result/move_constructor.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>basic_result(basic_result &amp;&amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/default.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>basic_result(basic_result &amp;&amp;)</code></h1></div></div></div>
+  <p>Move constructor.</p>
+
+<p><em>Requires</em>: that <code>value_type</code> and <code>error_type</code> both implement a move constructor.</p>
+
+<p><em>Complexity</em>: Same as for <code>value_type</code>&rsquo;s and <code>error_type</code>&rsquo;s move constructors. Constexpr, triviality and noexcept of underlying operations is propagated.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a <code>struct</code>.</p>
+
+
+        </div><p><small>Last revised: March 03, 2019 at 00:11:47 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/default.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/copy_constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/operator_bool.html b/doc/html/reference/types/basic_result/operator_bool.html
new file mode 100644
index 000000000..cd8deb3d7
--- /dev/null
+++ b/doc/html/reference/types/basic_result/operator_bool.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>explicit operator bool() const noexcept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_make_exception_ptr_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/has_value.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>explicit operator bool() const noexcept</code></h1></div></div></div>
+  <p>Returns true if a value is present. Constexpr where possible. Alias for <a href="../../../reference/types/basic_outcome/has_value.html" class="api-reference"><code>bool has_value() const noexcept</code></a>
+.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Constant time.</p>
+
+<p><em>Guarantees</em>: Never throws an exception.</p>
+
+
+        </div><p><small>Last revised: January 20, 2019 at 16:02:33 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/implicit_failure_make_exception_ptr_move_constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/has_value.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/swap.html b/doc/html/reference/types/basic_result/swap.html
new file mode 100644
index 000000000..0dd943f70
--- /dev/null
+++ b/doc/html/reference/types/basic_result/swap.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>void swap(basic_result &amp;) - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/inequality_failure_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/as_failure_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>void swap(basic_result &amp;)</code></h1></div></div></div>
+  <p>Swap one basic_result with another, with the strong guarantee. Constexpr if move constructors and move assignments of <code>value_type</code> and <code>error_type</code> are noexcept.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: If the move constructor and move assignment for <code>value_type</code> and <code>error_type</code> are noexcept, the complexity is the same as for the <code>swap()</code> implementations of the <code>value_type</code> and <code>error_type</code>. Otherwise, complexity is not preserved, as <a href="../../../reference/functions/strong_swap.html" class="api-reference"><code>strong_swap(bool &amp;all_good, T &amp;a, T &amp;b)</code></a>
+ is used instead of <code>swap()</code>. This function defaults to using one move construction and two assignments, and it will attempt extra move assignments in order to restore the state upon entry if a failure occurs.</p>
+
+<p><em>Guarantees</em>: If an exception is thrown during the swap operation, the state of both operands on entry is attempted to be restored, in order to implement the strong guarantee. If that too fails, the flag bits are forced to something consistent such that there can be no simultaneously valued and errored state, or valueless and errorless. The flag <a href="../../../reference/types/basic_result/has_lost_consistency.html" class="api-reference"><code>has_lost_consistency()</code></a>
+ becomes true for both operands, which are now likely in an inconsistent state.</p>
+
+
+        </div><p><small>Last revised: June 25, 2019 at 17:01:21 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/inequality_failure_type.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/as_failure_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/value_lvalue.html b/doc/html/reference/types/basic_result/value_lvalue.html
new file mode 100644
index 000000000..4cd23d03c
--- /dev/null
+++ b/doc/html/reference/types/basic_result/value_lvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_type &amp;value() &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_value_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/value_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_type &amp;value() &amp;</code></h1></div></div></div>
+  <p>Wide contract lvalue reference observer of any value present. <code>NoValuePolicy::wide_value_check()</code> is first invoked, then the reference to the value is returned.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/assume_value_rvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/value_lvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/value_lvalue_const.html b/doc/html/reference/types/basic_result/value_lvalue_const.html
new file mode 100644
index 000000000..9cef05886
--- /dev/null
+++ b/doc/html/reference/types/basic_result/value_lvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const value_type &amp;value() const &amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/value_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/value_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const value_type &amp;value() const &amp;</code></h1></div></div></div>
+  <p>Wide contract const lvalue reference observer of any value present. <code>NoValuePolicy::wide_value_check()</code> is first invoked, then the reference to the value is returned.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/value_lvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/value_rvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/value_rvalue.html b/doc/html/reference/types/basic_result/value_rvalue.html
new file mode 100644
index 000000000..5a8a65fbb
--- /dev/null
+++ b/doc/html/reference/types/basic_result/value_rvalue.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_type &amp;&amp;value() &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/value_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/value_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>value_type &amp;&amp;value() &amp;&amp;</code></h1></div></div></div>
+  <p>Wide contract rvalue reference observer of any value present. <code>NoValuePolicy::wide_value_check()</code> is first invoked, then the reference to the value is returned.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/value_lvalue_const.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/value_rvalue_const.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/basic_result/value_rvalue_const.html b/doc/html/reference/types/basic_result/value_rvalue_const.html
new file mode 100644
index 000000000..674dcd620
--- /dev/null
+++ b/doc/html/reference/types/basic_result/value_rvalue_const.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>const value_type &amp;&amp;value() const &amp;&amp; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/value_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_error_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>const value_type &amp;&amp;value() const &amp;&amp;</code></h1></div></div></div>
+  <p>Wide contract const rvalue reference observer of any value present. <code>NoValuePolicy::wide_value_check()</code> is first invoked, then the reference to the value is returned.</p>
+
+<p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
+
+<p><em>Requires</em>: Always available.</p>
+
+<p><em>Complexity</em>: Depends on <code>NoValuePolicy::wide_value_check()</code>.</p>
+
+<p><em>Guarantees</em>: None.</p>
+
+
+        </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../reference/types/basic_result/value_rvalue.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../reference/types/basic_result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../reference/types/basic_result/assume_error_lvalue.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/reference/types/failure_type.html b/doc/html/reference/types/failure_type.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/reference/types/failure_type.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>failure_type&lt;EC, EP = void&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/awaitables/eager.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../reference/types/awaitables/generator.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>failure_type&lt;EC, EP = void&gt;</code></h1></div></div></div>
+  <p>Type sugar for constructing an unsuccessful result or outcome. Generally not constructed directly, but via the free function <a href="../../reference/functions/failure.html" class="api-reference"><code>failure(T &amp;&amp;, ...)</code></a>
+. Detectable using <a href="../../reference/traits/is_failure_type.html" class="api-reference"><code>is_failure_type&lt;T&gt;</code></a>
+.</p>
+
+<p>This is a regular wrapper type, with defaulted default, copy and move constructor, defaulted assignment, and defaulted destructor.</p>
+
+<p>Member type aliases <code>error_type</code> and <code>exception_type</code> indicate <code>EC</code> and <code>E</code>.</p>
+
+<p>There is an explicit initialising constructor taking any types <code>U</code> and <code>V</code> which will forward construct the contained <code>error_type</code> and <code>exception_type</code> respectively. It also has an optional parameter <code>spare_storage</code>, if you wish to specify a spare storage value.</p>
+
+<p>There are two tagged initialising constructors taking <code>in_place_type_t&lt;error_type&gt;</code> or <code>in_place_type_t&lt;exception_type&gt;</code>, and a <code>U</code> which will forward construct the contained <code>error_type</code> and <code>exception_type</code> respectively. These both also have an optional parameter <code>spare_storage</code>, if you wish to specify a spare storage value.</p>
+
+<p>There are <code>.error()</code> and <code>.exception()</code> reference observers with the usual constexpr lvalue, const lvalue, rvalue and const rvalue overloads. One can discover which or both of these is valid using the usual <code>.has_error()</code> and <code>.has_exception()</code> observers.</p>
+
+<p>There is a <code>.spare_storage()</code> observer which returns the spare storage value with which the failure type sugar was constructed.</p>
+
+<p>There are specialisations <code>failure_type&lt;EC, void&gt;</code> and <code>failure_type&lt;void, E&gt;</code> which store nothing for the voided type and do not provide their observer functions.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/success_failure.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 23, 2021 at 17:37:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/awaitables/eager.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/types/in_place_type_t.html b/doc/html/reference/types/in_place_type_t.html
new file mode 100644
index 000000000..b47518e92
--- /dev/null
+++ b/doc/html/reference/types/in_place_type_t.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>in_place_type_t&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/awaitables/generator.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>in_place_type_t&lt;T&gt;</code></h1></div></div></div>
+  <p>Either <code>std::in_place_type_t&lt;T&gt;</code> or a local emulation, depending on the
+<a href="../../reference/macros/in_place_type.html" class="api-reference"><code>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE</code></a>
+ macro.</p>
+
+<p>Note that the templated variable <code>in_place_type</code> is also aliased or emulated locally.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: January 31, 2019 at 01:07:35 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/awaitables/generator.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/reference/types/success_type.html b/doc/html/reference/types/success_type.html
new file mode 100644
index 000000000..b78bd3c95
--- /dev/null
+++ b/doc/html/reference/types/success_type.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>success_type&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/awaitables/lazy.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both"><code>success_type&lt;T&gt;</code></h1></div></div></div>
+  <p>Type sugar for constructing a successful result or outcome. Generally not constructed directly, but via the free function <a href="../../reference/functions/success.html" class="api-reference"><code>success(T &amp;&amp;, ...)</code></a>
+. Detectable using <a href="../../reference/traits/is_success_type.html" class="api-reference"><code>is_success_type&lt;T&gt;</code></a>
+.</p>
+
+<p>This is a regular wrapper type, with defaulted default, copy and move constructor, defaulted assignment, and defaulted destructor.</p>
+
+<p>A member type alias <code>value_type</code> indicates <code>T</code>.</p>
+
+<p>There is an explicit initialising constructor taking any type <code>U</code> which is not a <code>success_type&lt;T&gt;</code>, and which will forward construct the contained <code>T</code> from that <code>U</code>. It also has an optional parameter <code>spare_storage</code>, if you wish to specify a spare storage value.</p>
+
+<p>There is a <code>.value()</code> reference observer with the usual constexpr lvalue, const lvalue, rvalue and const rvalue overloads.</p>
+
+<p>There is a specialisation <code>success_type&lt;void&gt;</code> which stores nothing and provides no <code>.value()</code> observers.</p>
+
+<p>There is a <code>.spare_storage()</code> observer which returns the spare storage value with which the success type sugar was constructed.</p>
+
+<p><em>Requires</em>: Nothing.</p>
+
+<p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE</code></p>
+
+<p><em>Header</em>: <code>&lt;boost/outcome/success_failure.hpp&gt;</code></p>
+
+
+        </div><p><small>Last revised: February 23, 2021 at 17:37:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../reference/types/awaitables/lazy.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../reference/types.html"><img src="../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/requirements.html b/doc/html/requirements.html
new file mode 100644
index 000000000..68ecb8abf
--- /dev/null
+++ b/doc/html/requirements.html
@@ -0,0 +1,79 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Prerequisites - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="./index.html"><img src="./images/prev.png" alt="Prev"></a>
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+
+  <div class="titlepage"><div><div><h1 style="clear: both">Prerequisites</h1></div></div></div>
+<p>Outcome is a header-only C++ 14 library known to work well on the latest
+point releases of these compiler-platform combinations or better:</p>
+
+<ul>
+<li>clang 4.0.1 (LLVM) [FreeBSD, Linux, OS X]</li>
+<li>GCC 6.5 [Linux]</li>
+<li>Visual Studio 2017.9 [Windows]</li>
+<li>XCode 9 [MacOS]</li>
+</ul>
+
+<p>For non-Windows non-POSIX platforms (typically embedded systems), Outcome
+is usable in its Outcome.Experimental form with the macro <code>BOOST_OUTCOME_SYSTEM_ERROR2_NOT_POSIX</code>
+defined.</p>
+
+<p>It is worth turning on C++ 17 or C++ 20 if you can, as there are many usability and
+performance improvements. Any Concepts TS or Coroutines TS implemented
+by your compiler is automatically detected and used.</p>
+
+<p>Known compiler issues (this was last updated April 2023):</p>
+
+<ul>
+<li><p>clang 3.5 - 3.9 can compile varying degrees of the test suite, the
+problem is lack of complete and unbuggy C++ 14 language support.</p></li>
+
+<li><p>Older point releases of GCCs 7 and 8 have internal compiler error bugs
+in their constexpr implementation which tend to be triggered by using
+Outcome in constexpr. If you don&rsquo;t use Outcome in constexpr, you won&rsquo;t
+see these problems. If you need your GCC to not ICE, upgrade to the
+very latest point release, the constexpr ICE has been since fixed.</p></li>
+
+<li><p>Early editions of Visual Studio 2017 have many corner case problems.
+From VS2017.9 onwards there remain a number of usually untroublesome corner
+case issues, but use should be relatively unsurprising for most use cases.
+Be aware that only from Visual Studio 2022 onwards are almost all corner
+case problems fixed.</p></li>
+
+<li><p>Some point releases of GCC 10 with libstdc++ 10 can induce an infinite
+template instantiation, which fails the build for some rare use cases. Earlier
+or later GCCs or different point releases of the 10 series do not have
+this issue.</p></li>
+</ul>
+
+<hr />
+
+<p>&ldquo;C++ 14&rdquo; compilers which do not work, and will not work until their
+maintainers fix them:</p>
+
+<ul>
+<li>GCC 5, due to a bug in nested template variables parsing which was fixed
+in GCC 6. I appreciate that this upsets a lot of users. Please raise your
+upset at <a href="https://gcc.gnu.org/bugzilla/">https://gcc.gnu.org/bugzilla/</a>. In the meantime, you can get fairly
+far in Outcome with even clang 3.5.</li>
+<li>Any compiler which uses the libstdc++ version which comes with GCC 5, as it does
+not implement enough of the C++ 14 standard library for Outcome to compile.</li>
+</ul>
+
+
+
+        </div><p><small>Last revised: April 18, 2023 at 20:57:50 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./index.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/sitemap.xml b/doc/html/sitemap.xml
new file mode 100644
index 000000000..723903b37
--- /dev/null
+++ b/doc/html/sitemap.xml
@@ -0,0 +1,2285 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
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+  xmlns:xhtml="http://www.w3.org/1999/xhtml">
+  
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+    <lastmod>2023-04-18T20:57:50+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/build.html</loc>
+    <lastmod>2021-04-02T11:06:20+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/essential/before.html</loc>
+    <lastmod>2020-12-15T12:22:39+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/interop/problem.html</loc>
+    <lastmod>2019-02-09T15:18:26+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/experimental/advantages.html</loc>
+    <lastmod>2024-07-16T21:33:35+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/interop/value-or-error.html</loc>
+    <lastmod>2020-12-15T12:22:39+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/motivation.html</loc>
+    <lastmod>2019-06-27T16:00:40+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/alternatives.html</loc>
+    <lastmod>2022-01-10T14:29:13+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/abi-stability.html</loc>
+    <lastmod>2021-12-15T11:47:12+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/essential/no-value/custom.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/experimental/map.html</loc>
+    <lastmod>2020-12-16T14:14:42+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/experimental/c-api/from-c/system_code.html</loc>
+    <lastmod>2024-07-17T17:54:05+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/essential/coroutines/try.html</loc>
+    <lastmod>2020-04-07T10:22:38+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/experimental/worked-example-long/preamble.html</loc>
+    <lastmod>2024-07-16T21:33:35+01:00</lastmod>
+  </url>
+  
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+    <loc>/tutorial/essential.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
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+    <lastmod>2019-03-22T13:58:05-07:00</lastmod>
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+    <lastmod>2024-07-16T21:33:35+01:00</lastmod>
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+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/macros.html</loc>
+    <lastmod>2018-12-10T20:32:00+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/payload/copy_file.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/interop/httplib.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial.html</loc>
+    <lastmod>2020-12-15T12:22:39+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/constructors/two-phase-init.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/essential/result.html</loc>
+    <lastmod>2021-02-23T17:37:27+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/alternatives/exceptions.html</loc>
+    <lastmod>2022-01-10T14:29:13+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/recipes.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/experimental.html</loc>
+    <lastmod>2020-12-17T11:27:06+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/interop/tidylib.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/constructors/file_handle.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/hooks/adl_bridging.html</loc>
+    <lastmod>2020-12-15T12:22:39+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference.html</loc>
+    <lastmod>2018-12-10T20:32:00+00:00</lastmod>
+  </url>
+  
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+    <lastmod>2024-07-16T21:33:35+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/concepts.html</loc>
+    <lastmod>2018-12-11T14:56:04+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/essential/coroutines/awaitables.html</loc>
+    <lastmod>2022-03-18T14:45:32+00:00</lastmod>
+  </url>
+  
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+    <lastmod>2024-07-16T21:33:35+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/experimental/c-api/from-cxx/example.html</loc>
+    <lastmod>2024-07-16T21:33:35+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/essential/result/inspecting.html</loc>
+    <lastmod>2019-03-22T15:01:40-07:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/experimental/differences.html</loc>
+    <lastmod>2020-12-16T14:14:42+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/interop/filelib.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/experimental/worked-example-long/value_type.html</loc>
+    <lastmod>2024-07-16T21:33:35+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/changelog/upgrade_v21_v22.html</loc>
+    <lastmod>2021-02-23T17:37:27+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/payload/copy_file2.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/motivation/errno.html</loc>
+    <lastmod>2019-01-16T01:05:39+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/essential/outcome.html</loc>
+    <lastmod>2019-03-19T22:57:48+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/alternatives/error_code.html</loc>
+    <lastmod>2022-01-10T14:29:13+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/converters.html</loc>
+    <lastmod>2018-12-15T17:49:37+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/essential/no-value.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/interop/app.html</loc>
+    <lastmod>2019-02-11T17:14:51+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/tutorial/advanced/payload/copy_file3.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/experimental/c-api/from-c.html</loc>
+    <lastmod>2024-07-17T17:54:05+01:00</lastmod>
+  </url>
+  
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+    <loc>/experimental/c-api/from-cxx/example2.html</loc>
+    <lastmod>2024-07-16T21:33:35+01:00</lastmod>
+  </url>
+  
+  <url>
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+    <lastmod>2022-03-18T14:45:32+00:00</lastmod>
+  </url>
+  
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+    <loc>/tutorial/advanced/payload.html</loc>
+    <lastmod>2019-02-08T22:18:08+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/motivation/error_codes.html</loc>
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+    <lastmod>2019-01-23T01:27:31+00:00</lastmod>
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+    <loc>/reference/aliases/std_outcome.html</loc>
+    <lastmod>2019-02-01T23:42:52+00:00</lastmod>
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+    <loc>/reference/aliases/std_result.html</loc>
+    <lastmod>2019-01-24T01:15:16+00:00</lastmod>
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+    <loc>/reference/aliases/std_unchecked.html</loc>
+    <lastmod>2019-01-23T01:27:31+00:00</lastmod>
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+    <loc>/reference/types/success_type.html</loc>
+    <lastmod>2021-02-23T17:37:27+00:00</lastmod>
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+    <lastmod>2019-01-22T01:11:40+00:00</lastmod>
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+    <loc>/reference/policies/throw_bad_result_access.html</loc>
+    <lastmod>2019-01-23T01:27:31+00:00</lastmod>
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+  
+  <url>
+    <loc>/reference/traits/type_can_be_used_in_basic_result.html</loc>
+    <lastmod>2019-01-24T01:15:16+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/hooks/spare_storage.html</loc>
+    <lastmod>2019-01-21T18:00:41+00:00</lastmod>
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+  
+  <url>
+    <loc>/reference/aliases/unchecked.html</loc>
+    <lastmod>2019-01-24T01:15:16+00:00</lastmod>
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+    <loc>/reference/converters/value_or_error.html</loc>
+    <lastmod>2020-12-15T12:22:39+00:00</lastmod>
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+  
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+    <loc>/reference/concepts/value_or_error.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
+  </url>
+  
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+    <loc>/reference/concepts/value_or_none.html</loc>
+    <lastmod>2020-12-15T12:22:39+00:00</lastmod>
+  </url>
+  
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+    <loc>/reference/functions/hooks/hook_outcome_construction.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/hooks/hook_outcome_construction2.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/hooks/hook_outcome_copy_construction.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
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+  
+  <url>
+    <loc>/reference/functions/hooks/hook_outcome_copy_construction2.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
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+  
+  <url>
+    <loc>/reference/functions/hooks/hook_outcome_in_place_construction.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/hooks/hook_outcome_move_construction.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
+  </url>
+  
+  <url>
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+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
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+  
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+    <loc>/reference/functions/hooks/hook_result_construction.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
+  </url>
+  
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+    <loc>/reference/functions/hooks/hook_result_copy_construction.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/hooks/hook_result_in_place_construction.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
+  </url>
+  
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+    <loc>/reference/functions/hooks/hook_result_move_construction.html</loc>
+    <lastmod>2020-08-19T12:15:40+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_enum.html</loc>
+    <lastmod>2019-08-13T13:55:04-04:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/policy/outcome_throw_as_system_error_with_payload_std_enum.html</loc>
+    <lastmod>2019-02-01T15:52:57+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/policy/outcome_throw_as_system_error_with_payload_boost_error_code.html</loc>
+    <lastmod>2019-01-24T01:15:16+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/policy/outcome_throw_as_system_error_with_payload_std_error_code.html</loc>
+    <lastmod>2019-02-01T15:52:57+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/hooks/override_outcome_exception.html</loc>
+    <lastmod>2019-01-30T16:16:10+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/hooks/set_spare_storage.html</loc>
+    <lastmod>2019-01-21T18:00:41+00:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/strong_swap.html</loc>
+    <lastmod>2019-06-24T21:09:37+01:00</lastmod>
+  </url>
+  
+  <url>
+    <loc>/reference/functions/try_throw_std_exception_from_error.html</loc>
+    <lastmod>2019-02-01T23:42:52+00:00</lastmod>
+  </url>
+  
+</urlset>
\ No newline at end of file
diff --git a/doc/html/tags.html b/doc/html/tags.html
new file mode 100644
index 000000000..c185f7890
--- /dev/null
+++ b/doc/html/tags.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Tags - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./requirements.html"><img src="./images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  3</span>
+	
+	    <a class="older-posts" href="./tags/page/2.html"> &rarr;</a>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  3</span>
+	
+	    <a class="older-posts" href="./tags/page/2.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 09, 2019 at 15:18:26 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./history.html"><img src="./images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./requirements.html"><img src="./images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/adl-bridging.html b/doc/html/tags/adl-bridging.html
new file mode 100644
index 000000000..15b1b87c1
--- /dev/null
+++ b/doc/html/tags/adl-bridging.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Adl Bridging - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/adl-bridging/page/1.html b/doc/html/tags/adl-bridging/page/1.html
new file mode 100644
index 000000000..36470a68e
--- /dev/null
+++ b/doc/html/tags/adl-bridging/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/adl-bridging.html</title><link rel="canonical" href="/tags/adl-bridging.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/adl-bridging.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/tags/asio.html b/doc/html/tags/asio.html
new file mode 100644
index 000000000..0fccf0a80
--- /dev/null
+++ b/doc/html/tags/asio.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Asio - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: August 06, 2019 at 10:42:06 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/asio/page/1.html b/doc/html/tags/asio/page/1.html
new file mode 100644
index 000000000..b757d3d56
--- /dev/null
+++ b/doc/html/tags/asio/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/asio.html</title><link rel="canonical" href="/tags/asio.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/asio.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/tags/awaitables.html b/doc/html/tags/awaitables.html
new file mode 100644
index 000000000..6c536ec27
--- /dev/null
+++ b/doc/html/tags/awaitables.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Awaitables - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: March 18, 2022 at 14:45:32 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/awaitables/page/1.html b/doc/html/tags/awaitables/page/1.html
new file mode 100644
index 000000000..d31edf1f8
--- /dev/null
+++ b/doc/html/tags/awaitables/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/awaitables.html</title><link rel="canonical" href="/tags/awaitables.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/awaitables.html" /></head></html>
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diff --git a/doc/html/tags/backtrace.html b/doc/html/tags/backtrace.html
new file mode 100644
index 000000000..c1dcfe4c2
--- /dev/null
+++ b/doc/html/tags/backtrace.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Backtrace - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/backtrace/page/1.html b/doc/html/tags/backtrace/page/1.html
new file mode 100644
index 000000000..6972982c8
--- /dev/null
+++ b/doc/html/tags/backtrace/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/backtrace.html</title><link rel="canonical" href="/tags/backtrace.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/backtrace.html" /></head></html>
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diff --git a/doc/html/tags/best-practice.html b/doc/html/tags/best-practice.html
new file mode 100644
index 000000000..dfe0d56c4
--- /dev/null
+++ b/doc/html/tags/best-practice.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Best Practice - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 09, 2019 at 15:18:26 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/best-practice/page/1.html b/doc/html/tags/best-practice/page/1.html
new file mode 100644
index 000000000..489c8b395
--- /dev/null
+++ b/doc/html/tags/best-practice/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/best-practice.html</title><link rel="canonical" href="/tags/best-practice.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/best-practice.html" /></head></html>
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diff --git a/doc/html/tags/co_await.html b/doc/html/tags/co_await.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/co_await.html
@@ -0,0 +1,45 @@
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+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Co_await - Boost.Outcome documentation</title>
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
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+<nav class="pagination" role="navigation">
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+	<span class="page-number"> 1  1</span>
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+
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+<nav class="pagination" role="navigation">
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+	
+</nav>
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+<hr>
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+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
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+</html>
diff --git a/doc/html/tags/co_await/page/1.html b/doc/html/tags/co_await/page/1.html
new file mode 100644
index 000000000..c726aec3d
--- /dev/null
+++ b/doc/html/tags/co_await/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/co_await.html</title><link rel="canonical" href="/tags/co_await.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/co_await.html" /></head></html>
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diff --git a/doc/html/tags/constructors.html b/doc/html/tags/constructors.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/constructors.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<body><div class="spirit-nav">
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+
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
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+	<span class="page-number"> 1  1</span>
+	
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+
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+
+<nav class="pagination" role="navigation">
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+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
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+
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+<hr>
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+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
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+</html>
diff --git a/doc/html/tags/constructors/page/1.html b/doc/html/tags/constructors/page/1.html
new file mode 100644
index 000000000..d30baea4a
--- /dev/null
+++ b/doc/html/tags/constructors/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/constructors.html</title><link rel="canonical" href="/tags/constructors.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/constructors.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/tags/conventions.html b/doc/html/tags/conventions.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/conventions.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Conventions - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<body><div class="spirit-nav">
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+
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+<nav class="pagination" role="navigation">
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+	
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+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 09, 2019 at 15:18:26 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
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+</html>
diff --git a/doc/html/tags/conventions/page/1.html b/doc/html/tags/conventions/page/1.html
new file mode 100644
index 000000000..b58cf4362
--- /dev/null
+++ b/doc/html/tags/conventions/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/conventions.html</title><link rel="canonical" href="/tags/conventions.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/conventions.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/tags/coroutines.html b/doc/html/tags/coroutines.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/coroutines.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Coroutines - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<body><div class="spirit-nav">
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+
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
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+
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+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: March 18, 2022 at 14:45:32 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/coroutines/page/1.html b/doc/html/tags/coroutines/page/1.html
new file mode 100644
index 000000000..22bb2b57d
--- /dev/null
+++ b/doc/html/tags/coroutines/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/coroutines.html</title><link rel="canonical" href="/tags/coroutines.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/coroutines.html" /></head></html>
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diff --git a/doc/html/tags/default-actions.html b/doc/html/tags/default-actions.html
new file mode 100644
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+++ b/doc/html/tags/default-actions.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Default Actions - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<body><div class="spirit-nav">
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+
+
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
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+
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+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/default-actions/page/1.html b/doc/html/tags/default-actions/page/1.html
new file mode 100644
index 000000000..86bd8d15e
--- /dev/null
+++ b/doc/html/tags/default-actions/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/default-actions.html</title><link rel="canonical" href="/tags/default-actions.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/default-actions.html" /></head></html>
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diff --git a/doc/html/tags/dual-api.html b/doc/html/tags/dual-api.html
new file mode 100644
index 000000000..76fd71c2d
--- /dev/null
+++ b/doc/html/tags/dual-api.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Dual Api - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
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+
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+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/dual-api/page/1.html b/doc/html/tags/dual-api/page/1.html
new file mode 100644
index 000000000..bef90479f
--- /dev/null
+++ b/doc/html/tags/dual-api/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/dual-api.html</title><link rel="canonical" href="/tags/dual-api.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/dual-api.html" /></head></html>
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diff --git a/doc/html/tags/eager.html b/doc/html/tags/eager.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/eager.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Eager - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
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+
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+
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+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: March 18, 2022 at 14:45:32 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/eager/page/1.html b/doc/html/tags/eager/page/1.html
new file mode 100644
index 000000000..487163e84
--- /dev/null
+++ b/doc/html/tags/eager/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/eager.html</title><link rel="canonical" href="/tags/eager.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/eager.html" /></head></html>
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diff --git a/doc/html/tags/error.html b/doc/html/tags/error.html
new file mode 100644
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+++ b/doc/html/tags/error.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Error - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
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+
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+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: March 22, 2019 at 15:01:40 -0700</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/error/page/1.html b/doc/html/tags/error/page/1.html
new file mode 100644
index 000000000..e1261e6a8
--- /dev/null
+++ b/doc/html/tags/error/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/error.html</title><link rel="canonical" href="/tags/error.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/error.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/tags/exception.html b/doc/html/tags/exception.html
new file mode 100644
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+++ b/doc/html/tags/exception.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Exception - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
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+
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+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: June 19, 2020 at 15:42:26 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/exception/page/1.html b/doc/html/tags/exception/page/1.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/exception/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/exception.html</title><link rel="canonical" href="/tags/exception.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/exception.html" /></head></html>
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diff --git a/doc/html/tags/has_error_code.html b/doc/html/tags/has_error_code.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/has_error_code.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Has_error_code - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+
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+
+<nav class="pagination" role="navigation">
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+	<span class="page-number"> 1  1</span>
+	
+</nav>
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+
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+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
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diff --git a/doc/html/tags/has_error_code/page/1.html b/doc/html/tags/has_error_code/page/1.html
new file mode 100644
index 000000000..645517eb8
--- /dev/null
+++ b/doc/html/tags/has_error_code/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/has_error_code.html</title><link rel="canonical" href="/tags/has_error_code.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/has_error_code.html" /></head></html>
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diff --git a/doc/html/tags/hooks.html b/doc/html/tags/hooks.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/hooks.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+</html>
diff --git a/doc/html/tags/hooks/page/1.html b/doc/html/tags/hooks/page/1.html
new file mode 100644
index 000000000..121472c5a
--- /dev/null
+++ b/doc/html/tags/hooks/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/hooks.html</title><link rel="canonical" href="/tags/hooks.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/hooks.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/tags/idioms.html b/doc/html/tags/idioms.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/idioms.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Idioms - Boost.Outcome documentation</title>
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
+<nav class="pagination" role="navigation">
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+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
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+
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+        </div><p><small>Last revised: February 09, 2019 at 15:18:26 UTC</small></p>
+<hr>
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+</html>
diff --git a/doc/html/tags/idioms/page/1.html b/doc/html/tags/idioms/page/1.html
new file mode 100644
index 000000000..0062984ae
--- /dev/null
+++ b/doc/html/tags/idioms/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/idioms.html</title><link rel="canonical" href="/tags/idioms.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/idioms.html" /></head></html>
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diff --git a/doc/html/tags/lazy.html b/doc/html/tags/lazy.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/lazy.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+	
+	<span class="page-number"> 1  1</span>
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+
+<nav class="pagination" role="navigation">
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+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
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+        </div><p><small>Last revised: March 18, 2022 at 14:45:32 UTC</small></p>
+<hr>
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+</html>
diff --git a/doc/html/tags/lazy/page/1.html b/doc/html/tags/lazy/page/1.html
new file mode 100644
index 000000000..9d11a0b72
--- /dev/null
+++ b/doc/html/tags/lazy/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/lazy.html</title><link rel="canonical" href="/tags/lazy.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/lazy.html" /></head></html>
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diff --git a/doc/html/tags/make_error_code.html b/doc/html/tags/make_error_code.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/make_error_code.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Make_error_code - Boost.Outcome documentation</title>
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+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+
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+<nav class="pagination" role="navigation">
+	
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+
+<nav class="pagination" role="navigation">
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+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
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+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
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+</html>
diff --git a/doc/html/tags/make_error_code/page/1.html b/doc/html/tags/make_error_code/page/1.html
new file mode 100644
index 000000000..7fe4af9c3
--- /dev/null
+++ b/doc/html/tags/make_error_code/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/make_error_code.html</title><link rel="canonical" href="/tags/make_error_code.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/make_error_code.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/tags/namespace.html b/doc/html/tags/namespace.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/namespace.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+
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+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
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+   
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+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
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+
+
+        </div><p><small>Last revised: February 23, 2021 at 17:37:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
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+</html>
diff --git a/doc/html/tags/namespace/page/1.html b/doc/html/tags/namespace/page/1.html
new file mode 100644
index 000000000..c2cccb183
--- /dev/null
+++ b/doc/html/tags/namespace/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/namespace.html</title><link rel="canonical" href="/tags/namespace.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/namespace.html" /></head></html>
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diff --git a/doc/html/tags/networking-ts.html b/doc/html/tags/networking-ts.html
new file mode 100644
index 000000000..569bf05b9
--- /dev/null
+++ b/doc/html/tags/networking-ts.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+
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+	<span class="page-number"> 1  1</span>
+	
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+<hr>
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+</html>
diff --git a/doc/html/tags/networking-ts/page/1.html b/doc/html/tags/networking-ts/page/1.html
new file mode 100644
index 000000000..b0360c076
--- /dev/null
+++ b/doc/html/tags/networking-ts/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/networking-ts.html</title><link rel="canonical" href="/tags/networking-ts.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/networking-ts.html" /></head></html>
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diff --git a/doc/html/tags/nodiscard.html b/doc/html/tags/nodiscard.html
new file mode 100644
index 000000000..5b76757ad
--- /dev/null
+++ b/doc/html/tags/nodiscard.html
@@ -0,0 +1,45 @@
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+</html>
diff --git a/doc/html/tags/nodiscard/page/1.html b/doc/html/tags/nodiscard/page/1.html
new file mode 100644
index 000000000..ef0fcde6d
--- /dev/null
+++ b/doc/html/tags/nodiscard/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/nodiscard.html</title><link rel="canonical" href="/tags/nodiscard.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/nodiscard.html" /></head></html>
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diff --git a/doc/html/tags/outcome.html b/doc/html/tags/outcome.html
new file mode 100644
index 000000000..3c26dda87
--- /dev/null
+++ b/doc/html/tags/outcome.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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diff --git a/doc/html/tags/outcome/page/1.html b/doc/html/tags/outcome/page/1.html
new file mode 100644
index 000000000..8c62cd620
--- /dev/null
+++ b/doc/html/tags/outcome/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/outcome.html</title><link rel="canonical" href="/tags/outcome.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/outcome.html" /></head></html>
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diff --git a/doc/html/tags/page/1.html b/doc/html/tags/page/1.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags.html</title><link rel="canonical" href="/tags.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags.html" /></head></html>
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diff --git a/doc/html/tags/page/2.html b/doc/html/tags/page/2.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/page/2.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+	    <a class="newer-posts" href="../../tags.html">&larr; </a>
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+   
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+   
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+   
+
+   
+
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+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../tags.html">&larr; </a>
+	
+	<span class="page-number"> 2  3</span>
+	
+	    <a class="older-posts" href="../../tags/page/3.html"> &rarr;</a>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../history.html"><img src="../../images/prev.png" alt="Prev"></a>
+    
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+</html>
diff --git a/doc/html/tags/page/3.html b/doc/html/tags/page/3.html
new file mode 100644
index 000000000..52fc40610
--- /dev/null
+++ b/doc/html/tags/page/3.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Tags - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
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+<body><div class="spirit-nav">
+<a accesskey="p" href="../../history.html"><img src="../../images/prev.png" alt="Prev"></a>
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+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../tags/page/2.html">&larr; </a>
+	
+	<span class="page-number"> 3  3</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	    <a class="newer-posts" href="../../tags/page/2.html">&larr; </a>
+	
+	<span class="page-number"> 3  3</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: August 06, 2019 at 10:42:06 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../history.html"><img src="../../images/prev.png" alt="Prev"></a>
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+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../requirements.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/payload.html b/doc/html/tags/payload.html
new file mode 100644
index 000000000..3d7d9fdba
--- /dev/null
+++ b/doc/html/tags/payload.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Payload - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
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+</html>
diff --git a/doc/html/tags/payload/page/1.html b/doc/html/tags/payload/page/1.html
new file mode 100644
index 000000000..61e83d413
--- /dev/null
+++ b/doc/html/tags/payload/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/payload.html</title><link rel="canonical" href="/tags/payload.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/payload.html" /></head></html>
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diff --git a/doc/html/tags/playpen.html b/doc/html/tags/playpen.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/playpen.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Playpen - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
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+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/playpen/page/1.html b/doc/html/tags/playpen/page/1.html
new file mode 100644
index 000000000..6087bec43
--- /dev/null
+++ b/doc/html/tags/playpen/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/playpen.html</title><link rel="canonical" href="/tags/playpen.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/playpen.html" /></head></html>
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diff --git a/doc/html/tags/policies.html b/doc/html/tags/policies.html
new file mode 100644
index 000000000..80f985e1d
--- /dev/null
+++ b/doc/html/tags/policies.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Policies - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
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+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/policies/page/1.html b/doc/html/tags/policies/page/1.html
new file mode 100644
index 000000000..30f3caa94
--- /dev/null
+++ b/doc/html/tags/policies/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/policies.html</title><link rel="canonical" href="/tags/policies.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/policies.html" /></head></html>
\ No newline at end of file
diff --git a/doc/html/tags/result.html b/doc/html/tags/result.html
new file mode 100644
index 000000000..3ab4b46fa
--- /dev/null
+++ b/doc/html/tags/result.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Result - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 23, 2021 at 17:37:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/result/page/1.html b/doc/html/tags/result/page/1.html
new file mode 100644
index 000000000..50aafa911
--- /dev/null
+++ b/doc/html/tags/result/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/result.html</title><link rel="canonical" href="/tags/result.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/result.html" /></head></html>
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diff --git a/doc/html/tags/try.html b/doc/html/tags/try.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tags/try.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Try - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: February 23, 2021 at 17:37:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/try/page/1.html b/doc/html/tags/try/page/1.html
new file mode 100644
index 000000000..b5dfc0317
--- /dev/null
+++ b/doc/html/tags/try/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/try.html</title><link rel="canonical" href="/tags/try.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/try.html" /></head></html>
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diff --git a/doc/html/tags/value-or-error.html b/doc/html/tags/value-or-error.html
new file mode 100644
index 000000000..3796c46aa
--- /dev/null
+++ b/doc/html/tags/value-or-error.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Value or Error - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/value-or-error/page/1.html b/doc/html/tags/value-or-error/page/1.html
new file mode 100644
index 000000000..baaf7c2b7
--- /dev/null
+++ b/doc/html/tags/value-or-error/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/value-or-error.html</title><link rel="canonical" href="/tags/value-or-error.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/value-or-error.html" /></head></html>
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diff --git a/doc/html/tags/value.html b/doc/html/tags/value.html
new file mode 100644
index 000000000..5eb762da0
--- /dev/null
+++ b/doc/html/tags/value.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Value - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+
+
+<div class="extra-pagination inner">
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+</div>
+
+
+   
+
+   
+
+   
+
+
+<div style="margin-bottom:2rem"></div>
+
+<nav class="pagination" role="navigation">
+	
+	<span class="page-number"> 1  1</span>
+	
+</nav>
+
+
+
+
+        </div><p><small>Last revised: March 22, 2019 at 15:01:40 -0700</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../history.html"><img src="../images/prev.png" alt="Prev"></a>
+    
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../requirements.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tags/value/page/1.html b/doc/html/tags/value/page/1.html
new file mode 100644
index 000000000..f6d090db8
--- /dev/null
+++ b/doc/html/tags/value/page/1.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><title>/tags/value.html</title><link rel="canonical" href="/tags/value.html"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=/tags/value.html" /></head></html>
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diff --git a/doc/html/tutorial.html b/doc/html/tutorial.html
new file mode 100644
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+++ b/doc/html/tutorial.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Tutorial - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="./abi-stability.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./tutorial/essential.html"><img src="./images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Tutorial</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="./tutorial/essential.html" >Essential</a>
+<p>The absolute minimum that you need to know to get started with Outcome immediately.</p><ol><li>
+	<a href="./tutorial/essential/before.html" >Before we begin</a>
+<p>Essential information before you begin the tutorial.</p><li>
+	<a href="./tutorial/essential/result.html" >result&lt;&gt;</a>
+<p>Gentle introduction to writing code with simple success-or-failure return types.</p><li>
+	<a href="./tutorial/essential/outcome.html" >outcome&lt;&gt;</a>
+<p>Success-or-failure return types where failure can take two forms, expected/handled failure and unexpected/abort failure.</p><li>
+	<a href="./tutorial/essential/no-value.html" >No-value policies</a>
+<p>Describes the concept of NoValuePolicy and how to use no-value policies.</p><li>
+	<a href="./tutorial/essential/coroutines.html" >Coroutines</a>
+<p>Using Outcome in C++ Coroutines</p><li>
+	<a href="./tutorial/essential/conventions.html" >Conventions</a>
+<p>Why you should avoid custom <code>E</code> types in public APIs.</p></li></ol><li>
+	<a href="./tutorial/advanced.html" >Advanced</a>
+<p>If you have a bit more time, this covers all the time-saving ways you can customise and automate Outcome for various use cases, especially in larger codebases made up of multiple third party libraries.</p><ol><li>
+	<a href="./tutorial/advanced/payload.html" >Custom payloads</a>
+<p>Success-or-failure return types where extra information in addition to the error code accompanies failure.</p><li>
+	<a href="./tutorial/advanced/constructors.html" >Result returning constructors</a>
+<p>How to metaprogram construction of objects which use result<T, EC> to return failure instead of throwing a C++ exception.</p><li>
+	<a href="./tutorial/advanced/hooks.html" >Hooking events</a>
+<p>Intercepting useful events such as initial construction, copies and moves so you can capture backtraces, fire debug breakpoints etc.</p><li>
+	<a href="./tutorial/advanced/interop.html" >Interoperation</a>
+<p>Interoperating with std::expected<T, E> and other ValueOrError concept matching types.</p></li></ol></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./abi-stability.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./tutorial/essential.html"><img src="./images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced.html b/doc/html/tutorial/advanced.html
new file mode 100644
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--- /dev/null
+++ b/doc/html/tutorial/advanced.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Advanced - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../tutorial/essential/conventions.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../tutorial.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../tutorial/advanced/payload.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Advanced</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../tutorial/advanced/payload.html" >Custom payloads</a>
+<p>Success-or-failure return types where extra information in addition to the error code accompanies failure.</p><ol><li>
+	<a href="../tutorial/advanced/payload/copy_file.html" >The Filesystem TS</a><li>
+	<a href="../tutorial/advanced/payload/copy_file2.html" >Upgrading the Filesystem TS</a><li>
+	<a href="../tutorial/advanced/payload/copy_file3.html" >Auto-throwing filesystem_error</a></li></ol><li>
+	<a href="../tutorial/advanced/constructors.html" >Result returning constructors</a>
+<p>How to metaprogram construction of objects which use result<T, EC> to return failure instead of throwing a C++ exception.</p><ol><li>
+	<a href="../tutorial/advanced/constructors/two-phase-init.html" >Two phase construction</a><li>
+	<a href="../tutorial/advanced/constructors/file_handle.html" >A file handle</a><li>
+	<a href="../tutorial/advanced/constructors/static-constructor.html" >Phase 2 construction</a><li>
+	<a href="../tutorial/advanced/constructors/metaprogrammg1.html" >Phase 3</a><li>
+	<a href="../tutorial/advanced/constructors/metaprogrammg2.html" >construct<T></a><li>
+	<a href="../tutorial/advanced/constructors/metaprogrammg3.html" >Alternatives</a></li></ol><li>
+	<a href="../tutorial/advanced/hooks.html" >Hooking events</a>
+<p>Intercepting useful events such as initial construction, copies and moves so you can capture backtraces, fire debug breakpoints etc.</p><ol><li>
+	<a href="../tutorial/advanced/hooks/keeping_state.html" >Keeping state</a><li>
+	<a href="../tutorial/advanced/hooks/adl_bridging.html" >ADL bridging</a><li>
+	<a href="../tutorial/advanced/hooks/hook_result.html" >Hook result</a><li>
+	<a href="../tutorial/advanced/hooks/poke_exception.html" >Custom exception ptr</a><li>
+	<a href="../tutorial/advanced/hooks/hook_outcome.html" >Hook outcome</a></li></ol><li>
+	<a href="../tutorial/advanced/interop.html" >Interoperation</a>
+<p>Interoperating with std::expected<T, E> and other ValueOrError concept matching types.</p><ol><li>
+	<a href="../tutorial/advanced/interop/problem.html" >Incommensurate E types</a><li>
+	<a href="../tutorial/advanced/interop/value-or-error.html" >value_or_error Concept</a><li>
+	<a href="../tutorial/advanced/interop/httplib.html" >The HTTP library</a><li>
+	<a href="../tutorial/advanced/interop/tidylib.html" >The HTMLTidy library</a><li>
+	<a href="../tutorial/advanced/interop/filelib.html" >The File I/O library</a><li>
+	<a href="../tutorial/advanced/interop/app.html" >The Application</a><li>
+	<a href="../tutorial/advanced/interop/app-map-httplib1.html" >Mapping the HTTP library into the Application <code>1/2</code></a><li>
+	<a href="../tutorial/advanced/interop/app-map-httplib2.html" >Mapping the HTTP library into the Application <code>2/2</code></a><li>
+	<a href="../tutorial/advanced/interop/app-map-filelib.html" >Mapping the File I/O library into the Application</a><li>
+	<a href="../tutorial/advanced/interop/app-map-tidylib.html" >Mapping the HTMLTidy library into the Application</a><li>
+	<a href="../tutorial/advanced/interop/app-go.html" >In use</a><li>
+	<a href="../tutorial/advanced/interop/conclusion.html" >Conclusion</a></li></ol></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../tutorial/essential/conventions.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../tutorial.html"><img src="../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/tutorial/advanced/constructors.html b/doc/html/tutorial/advanced/constructors.html
new file mode 100644
index 000000000..726209dc5
--- /dev/null
+++ b/doc/html/tutorial/advanced/constructors.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Result returning constructors - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/advanced/payload/copy_file3.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/advanced.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/advanced/constructors/two-phase-init.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Result returning constructors</h1></div></div></div>
+<p>An oft-asked question during conference talks on Expected/Outcome is how to
+exclusively use <code>result</code> to implement constructor failure. This is asked because
+whilst almost every member function in a class can return a <code>result</code>, constructors
+do not return values and thus cannot return a <code>result</code>. The implication is
+that one cannot avoid throwing C++ exceptions to abort a construction.</p>
+
+<p>As with most things in C++, one can achieve zero-exception-throw object
+construction using a lot of
+extra typing of boilerplate, and a little bit of simple C++ metaprogramming. This section
+shows you how to implement these for those who are absolutely adverse to ever throwing an exception,
+or cannot because C++ exceptions have been globally disabled.</p>
+
+<p>The technique described here is not suitable for non-copyable and non-movable
+types. There is also an assumption that moving your type is cheap.</p>
+
+
+
+        </div><p><small>Last revised: June 24, 2019 at 21:48:18 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/advanced/payload/copy_file3.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/advanced.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/advanced/constructors/two-phase-init.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/constructors/file_handle.html b/doc/html/tutorial/advanced/constructors/file_handle.html
new file mode 100644
index 000000000..2bfc4961c
--- /dev/null
+++ b/doc/html/tutorial/advanced/constructors/file_handle.html
@@ -0,0 +1,103 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>A file handle - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors/two-phase-init.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/constructors/static-constructor.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">A file handle</h1></div></div></div>
+  <p>Borrowing from <a href="https://ned14.github.io/llfio/classllfio__v2__xxx_1_1file__handle.html"><code>llfio::file_handle</code></a>
+which uses this design pattern<sup class="footnote-ref" id="fnref:1"><a href="#fn:1">1</a></sup>, here is a simplified <code>file_handle</code> implementation:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">class</span><span class="err"> </span><span class="nc">file_handle</span>
+<span class="p">{</span>
+  <span class="kt">int</span> <span class="n">_fd</span><span class="p">{</span><span class="o">-</span><span class="mi">1</span><span class="p">};</span>  <span class="c1">// file descriptor
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="n">stat</span> <span class="n">_stat</span>
+  <span class="p">{</span>
+    <span class="mi">0</span>
+  <span class="p">};</span>  <span class="c1">// stat of the fd at open
+</span><span class="c1"></span>
+  <span class="c1">// Phase 1 private constexpr constructor
+</span><span class="c1"></span>  <span class="k">constexpr</span> <span class="nf">file_handle</span><span class="p">()</span> <span class="p">{}</span>
+
+<span class="k">public</span><span class="o">:</span>
+  <span class="k">using</span> <span class="n">path_type</span> <span class="o">=</span> <span class="n">filesystem</span><span class="o">::</span><span class="n">path</span><span class="p">;</span>
+
+  <span class="c1">//! The behaviour of the handle: does it read, read and write, or atomic append?
+</span><span class="c1"></span>  <span class="k">enum</span> <span class="k">class</span><span class="err"> </span><span class="nc">mode</span> <span class="o">:</span> <span class="kt">unsigned</span> <span class="kt">char</span>  <span class="c1">// bit 0 set means writable
+</span><span class="c1"></span>  <span class="p">{</span>
+    <span class="n">unchanged</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span>
+    <span class="n">none</span> <span class="o">=</span> <span class="mi">2</span><span class="p">,</span>        <span class="c1">//!&lt; No ability to read or write anything, but can synchronise (SYNCHRONIZE or 0)
+</span><span class="c1"></span>    <span class="n">attr_read</span> <span class="o">=</span> <span class="mi">4</span><span class="p">,</span>   <span class="c1">//!&lt; Ability to read attributes (FILE_READ_ATTRIBUTES|SYNCHRONIZE or O_RDONLY)
+</span><span class="c1"></span>    <span class="n">attr_write</span> <span class="o">=</span> <span class="mi">5</span><span class="p">,</span>  <span class="c1">//!&lt; Ability to read and write attributes (FILE_READ_ATTRIBUTES|FILE_WRITE_ATTRIBUTES|SYNCHRONIZE or O_RDONLY)
+</span><span class="c1"></span>    <span class="n">read</span> <span class="o">=</span> <span class="mi">6</span><span class="p">,</span>        <span class="c1">//!&lt; Ability to read (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|SYNCHRONISE or O_RDONLY)
+</span><span class="c1"></span>    <span class="n">write</span> <span class="o">=</span> <span class="mi">7</span><span class="p">,</span>       <span class="c1">//!&lt; Ability to read and write (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|FILE_WRITE_DATA|FILE_WRITE_ATTRIBUTES|FILE_WRITE_EA|FILE_APPEND_DATA|SYNCHRONISE or O_RDWR)
+</span><span class="c1"></span>    <span class="n">append</span> <span class="o">=</span> <span class="mi">9</span>       <span class="c1">//!&lt; All mainstream OSs and CIFS guarantee this is atomic with respect to all other appenders (FILE_APPEND_DATA|SYNCHRONISE or O_APPEND)
+</span><span class="c1"></span>  <span class="p">};</span>
+
+  <span class="c1">// Moves but not copies permitted
+</span><span class="c1"></span>  <span class="n">file_handle</span><span class="p">(</span><span class="k">const</span> <span class="n">file_handle</span> <span class="o">&amp;</span><span class="p">)</span> <span class="o">=</span> <span class="k">delete</span><span class="p">;</span>
+  <span class="n">file_handle</span><span class="p">(</span><span class="n">file_handle</span> <span class="o">&amp;&amp;</span><span class="n">o</span><span class="p">)</span> <span class="k">noexcept</span> <span class="o">:</span> <span class="n">_fd</span><span class="p">(</span><span class="n">o</span><span class="p">.</span><span class="n">_fd</span><span class="p">)</span> <span class="p">{</span> <span class="n">o</span><span class="p">.</span><span class="n">_fd</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span> <span class="p">}</span>
+  <span class="n">file_handle</span> <span class="o">&amp;</span><span class="k">operator</span><span class="o">=</span><span class="p">(</span><span class="k">const</span> <span class="n">file_handle</span> <span class="o">&amp;</span><span class="p">)</span> <span class="o">=</span> <span class="k">delete</span><span class="p">;</span>
+  <span class="n">file_handle</span> <span class="o">&amp;</span><span class="k">operator</span><span class="o">=</span><span class="p">(</span><span class="n">file_handle</span> <span class="o">&amp;&amp;</span><span class="n">o</span><span class="p">)</span> <span class="k">noexcept</span>
+  <span class="p">{</span>
+    <span class="k">this</span><span class="o">-&gt;~</span><span class="n">file_handle</span><span class="p">();</span>
+    <span class="k">new</span><span class="p">(</span><span class="k">this</span><span class="p">)</span> <span class="n">file_handle</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">o</span><span class="p">));</span>
+    <span class="k">return</span> <span class="o">*</span><span class="k">this</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="c1">// Destruction closes the handle
+</span><span class="c1"></span>  <span class="o">~</span><span class="n">file_handle</span><span class="p">()</span>
+  <span class="p">{</span>
+    <span class="k">if</span><span class="p">(</span><span class="n">_fd</span> <span class="o">!=</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="k">if</span><span class="p">(</span><span class="o">-</span><span class="mi">1</span> <span class="o">==</span> <span class="o">::</span><span class="n">close</span><span class="p">(</span><span class="n">_fd</span><span class="p">))</span>
+      <span class="p">{</span>
+        <span class="kt">int</span> <span class="n">e</span> <span class="o">=</span> <span class="n">errno</span><span class="p">;</span>
+        <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;FATAL: Closing the fd during destruction failed due to &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">strerror</span><span class="p">(</span><span class="n">e</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+        <span class="n">std</span><span class="o">::</span><span class="n">terminate</span><span class="p">();</span>
+      <span class="p">}</span>
+      <span class="n">_fd</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
+    <span class="p">}</span>
+  <span class="p">}</span>
+
+  <span class="c1">// Phase 2 static member constructor function, which cannot throw
+</span><span class="c1"></span>  <span class="k">static</span> <span class="kr">inline</span> <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span> <span class="n">file</span><span class="p">(</span><span class="n">path_type</span> <span class="n">path</span><span class="p">,</span> <span class="n">mode</span> <span class="n">mode</span> <span class="o">=</span> <span class="n">mode</span><span class="o">::</span><span class="n">read</span><span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span>
+<span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/constructors.cpp#L58" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Note the default member initialisers, these are particularly convenient for
+implementing phase 1 of construction. Note also the <code>constexpr</code> constructor,
+which thanks to the default member initialisers is otherwise empty.</p>
+
+<p>File handles are very expensive to copy as they involve a syscall to duplicate
+the file descriptor, so we enable moves only.</p>
+
+<p>The destructor closes the file descriptor if it is not -1, and if the close
+fails, seeing as there is nothing else we can do without leaking the file
+descriptor, we fatal exit the process.</p>
+
+<p>Finally we declare the phase 2 constructor which is a static member function.</p>
+<div class="footnotes">
+
+<hr />
+
+<ol>
+<li id="fn:1">LLFIO uses Outcome &ldquo;in anger&rdquo;, both in Standard and Experimental configurations. If you would like a real world user of Outcome to study the source code of, it can be studied at <a href="https://github.com/ned14/llfio/">https://github.com/ned14/llfio/</a>.
+ <a class="footnote-return" href="#fnref:1"><sup>[return]</sup></a></li>
+</ol>
+</div>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors/two-phase-init.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/constructors/static-constructor.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/constructors/metaprogrammg1.html b/doc/html/tutorial/advanced/constructors/metaprogrammg1.html
new file mode 100644
index 000000000..2253d0c10
--- /dev/null
+++ b/doc/html/tutorial/advanced/constructors/metaprogrammg1.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Phase 3 - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors/static-constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/constructors/metaprogrammg2.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Phase 3</h1></div></div></div>
+  <p>We have built our first two phases of construction for <code>file_handle</code>,
+and for some users they might be happy writing:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span> <span class="n">fh1</span> <span class="o">=</span> <span class="n">file_handle</span><span class="o">::</span><span class="n">file</span><span class="p">(</span><span class="s">&#34;hello&#34;</span> <span class="cm">/*, file_handle::mode::read */</span><span class="p">);</span>
+  <span class="k">if</span><span class="p">(</span><span class="o">!</span><span class="n">fh1</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Opening file &#39;hello&#39; failed with &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">fh1</span><span class="p">.</span><span class="n">error</span><span class="p">().</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/constructors.cpp#L185" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>&hellip; and be done with it.</p>
+
+<p>But wouldn&rsquo;t it be nicer if we could instead write:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span> <span class="n">fh2</span> <span class="o">=</span> <span class="n">make</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span><span class="p">{</span><span class="s">&#34;hello&#34;</span> <span class="cm">/*, file_handle::mode::read */</span><span class="p">}();</span>
+  <span class="k">if</span><span class="p">(</span><span class="o">!</span><span class="n">fh2</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Opening file &#39;hello&#39; failed with &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">fh2</span><span class="p">.</span><span class="n">error</span><span class="p">().</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/constructors.cpp#L192" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The eye is immediately drawn to the two-stage invocation pattern, so we are
+constructing a type <code>make&lt;file_handle&gt;</code> using the arguments with which we wish
+to invoke the <code>file_handle</code> constructor with, and then invoking the
+call operator on that <code>make&lt;file_handle&gt;</code> instance to do the
+actual construction.</p>
+
+<p>It may seem a bit clunky to use brace initialisation for parameters followed
+by a &ldquo;spurious&rdquo; set of empty brackets, but we think that this is a better
+approach than alternatives. We shall briefly cover those at the end of this section.</p>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors/static-constructor.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/tutorial/advanced/constructors/metaprogrammg2.html b/doc/html/tutorial/advanced/constructors/metaprogrammg2.html
new file mode 100644
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>construct&lt;T&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors/metaprogrammg1.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/constructors/metaprogrammg3.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">construct<T></h1></div></div></div>
+  <p>First, we need a base definition for <code>make&lt;T&gt;</code>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span> <span class="k">struct</span> <span class="n">make</span>
+<span class="p">{</span>
+  <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span> <span class="k">operator</span><span class="p">()()</span> <span class="k">const</span> <span class="k">noexcept</span>
+  <span class="p">{</span>                                            <span class="c1">//
+</span><span class="c1"></span>    <span class="k">static_assert</span><span class="p">(</span><span class="o">!</span><span class="n">std</span><span class="o">::</span><span class="n">is_same</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">T</span><span class="o">&gt;::</span><span class="n">value</span><span class="p">,</span>  <span class="c1">//
+</span><span class="c1"></span>                  <span class="s">&#34;make&lt;T&gt;() was not specialised for the type T supplied&#34;</span><span class="p">);</span>
+  <span class="p">}</span>
+<span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/constructors.cpp#L158" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>This fails a static assert if the type is ever instantiated unspecialised.</p>
+
+<p>We then specialise for <code>make&lt;file_handle&gt;</code>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">template</span> <span class="o">&lt;&gt;</span> <span class="k">struct</span> <span class="n">make</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span>
+<span class="p">{</span>
+  <span class="n">file_handle</span><span class="o">::</span><span class="n">path_type</span> <span class="n">_path</span><span class="p">;</span>
+  <span class="n">file_handle</span><span class="o">::</span><span class="n">mode</span> <span class="n">_mode</span><span class="p">{</span><span class="n">file_handle</span><span class="o">::</span><span class="n">mode</span><span class="o">::</span><span class="n">read</span><span class="p">};</span>
+  <span class="c1">// Any other args, default initialised if necessary, follow here ...
+</span><span class="c1"></span>
+  <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span> <span class="k">operator</span><span class="p">()()</span> <span class="k">const</span> <span class="k">noexcept</span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="p">{</span>
+    <span class="k">return</span> <span class="n">file_handle</span><span class="o">::</span><span class="n">file</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">_path</span><span class="p">));</span>
+  <span class="p">}</span>
+<span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/constructors.cpp#L169" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Because this is a struct, we can list initialise <code>make</code>, and use
+default member initialisers to implement default arguments. This can get
+you surprisingly far before you need to start writing custom constructors.</p>
+
+<p>But in more complex code, you will usually provide all the initialisation overloads that
+you would for the constructors of your main type. You then implement a single phase 2 constructing
+function which accepts <code>make&lt;YOURTYPE&gt;</code> as input, and construct solely from
+that source.</p>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors/metaprogrammg1.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/tutorial/advanced/constructors/metaprogrammg3.html b/doc/html/tutorial/advanced/constructors/metaprogrammg3.html
new file mode 100644
index 000000000..107ad3f03
--- /dev/null
+++ b/doc/html/tutorial/advanced/constructors/metaprogrammg3.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Alternatives - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors/metaprogrammg2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Alternatives</h1></div></div></div>
+  <p>No doubt many will dislike the two-stage invocation pattern i.e.</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">make</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span><span class="p">{</span><span class="s">&#34;hello&#34;</span><span class="p">}();</span>
+</code></pre></div>
+<p>So let us examine the most obvious alternative: a templated free function <code>make&lt;T&gt;</code>.</p>
+
+<p>Due to the inability to partially specialise templated functions in C++, you
+need to use tagged overloading e.g.</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">template</span><span class="o">&lt;</span><span class="k">class</span><span class="err">... </span><span class="nc">Args</span><span class="o">&gt;</span>
+<span class="kr">inline</span> <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span> <span class="n">make</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">in_place_type_t</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">Args</span><span class="o">&amp;&amp;</span> <span class="p">...</span> <span class="n">args</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">return</span> <span class="n">file_handle</span><span class="o">::</span><span class="n">file</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">Args</span><span class="o">&gt;</span><span class="p">(</span><span class="n">args</span><span class="p">)...);</span>
+<span class="p">}</span>
+<span class="p">...</span>
+<span class="c1">// Now you must always write this:
+</span><span class="c1"></span><span class="n">make</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">in_place_type</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span><span class="p">,</span> <span class="s">&#34;hello&#34;</span><span class="p">);</span>
+</code></pre></div>
+<p>Tagged overloading is fine for smaller projects, but for larger code bases:</p>
+
+<ol>
+<li>It takes longer to type <code>make(std::in_place_type&lt;file_handle&gt;, &quot;hello&quot;)</code>,
+and is possibly less intuitive to write,
+than it does <code>make&lt;file_handle&gt;{&quot;hello&quot;}()</code>.</li>
+<li>Compiler error messages are enormously clearer if you encode the permitted
+overloads for construction into the <code>make&lt;file_handle&gt;</code> type rather than
+letting a variadic free function fail to resolve an appropriate overload.</li>
+<li>Resolving variadic free function overloads is not constant time for the compiler,
+whereas resolving the type specialisation for <code>make&lt;file_handle&gt;</code>
+is constant time. In other words, free functions are <em>expensive</em> on build
+times, whereas fully specialised types are not.</li>
+<li>It actually turns out to be quite useful when writing generic code
+to pass around object constructing factory objects all of which have
+no parameters for their call operator. It becomes, effectively, a
+<em>lazy construction</em> mechanism.</li>
+</ol>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors/metaprogrammg2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/tutorial/advanced/constructors/static-constructor.html b/doc/html/tutorial/advanced/constructors/static-constructor.html
new file mode 100644
index 000000000..e012967af
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@@ -0,0 +1,86 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Phase 2 construction - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors/file_handle.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/constructors/metaprogrammg1.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Phase 2 construction</h1></div></div></div>
+  <p>Its phase 2 constructor:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// Phase 2 static member constructor function, which cannot throw
+</span><span class="c1"></span><span class="kr">inline</span> <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">file_handle</span><span class="o">&gt;</span> <span class="n">file_handle</span><span class="o">::</span><span class="n">file</span><span class="p">(</span><span class="n">file_handle</span><span class="o">::</span><span class="n">path_type</span> <span class="n">path</span><span class="p">,</span> <span class="n">file_handle</span><span class="o">::</span><span class="n">mode</span> <span class="n">mode</span><span class="p">)</span> <span class="k">noexcept</span>
+<span class="p">{</span>
+  <span class="c1">// Perform phase 1 of object construction
+</span><span class="c1"></span>  <span class="n">file_handle</span> <span class="n">ret</span><span class="p">;</span>
+
+  <span class="c1">// Perform phase 2 of object construction
+</span><span class="c1"></span>  <span class="kt">int</span> <span class="n">flags</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
+  <span class="k">switch</span><span class="p">(</span><span class="n">mode</span><span class="p">)</span>
+  <span class="p">{</span>
+  <span class="k">case</span> <span class="n">mode</span><span class="o">::</span><span class="nl">attr_read</span><span class="p">:</span>
+  <span class="k">case</span> <span class="n">mode</span><span class="o">::</span><span class="nl">read</span><span class="p">:</span>
+    <span class="n">flags</span> <span class="o">=</span> <span class="n">O_RDONLY</span><span class="p">;</span>
+    <span class="k">break</span><span class="p">;</span>
+  <span class="k">case</span> <span class="n">mode</span><span class="o">::</span><span class="nl">attr_write</span><span class="p">:</span>
+  <span class="k">case</span> <span class="n">mode</span><span class="o">::</span><span class="nl">write</span><span class="p">:</span>
+    <span class="n">flags</span> <span class="o">=</span> <span class="n">O_RDWR</span><span class="p">;</span>
+    <span class="k">break</span><span class="p">;</span>
+  <span class="k">case</span> <span class="n">mode</span><span class="o">::</span><span class="nl">append</span><span class="p">:</span>
+    <span class="n">flags</span> <span class="o">=</span> <span class="n">O_APPEND</span><span class="p">;</span>
+    <span class="k">break</span><span class="p">;</span>
+  <span class="k">default</span><span class="o">:</span>
+    <span class="k">return</span> <span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="n">ret</span><span class="p">.</span><span class="n">_fd</span> <span class="o">=</span> <span class="o">::</span><span class="n">open</span><span class="p">(</span><span class="n">path</span><span class="p">.</span><span class="n">u8string</span><span class="p">().</span><span class="n">c_str</span><span class="p">(),</span> <span class="n">flags</span><span class="p">);</span>
+  <span class="k">if</span><span class="p">(</span><span class="o">-</span><span class="mi">1</span> <span class="o">==</span> <span class="n">ret</span><span class="p">.</span><span class="n">_fd</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="c1">// Note that if we bail out here, ~file_handle() will correctly not call ::close()
+</span><span class="c1"></span>    <span class="k">return</span> <span class="p">{</span><span class="n">errno</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">system_category</span><span class="p">()};</span>
+  <span class="p">}</span>
+  <span class="k">if</span><span class="p">(</span><span class="o">-</span><span class="mi">1</span> <span class="o">==</span> <span class="o">::</span><span class="n">fstat</span><span class="p">(</span><span class="n">ret</span><span class="p">.</span><span class="n">_fd</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">ret</span><span class="p">.</span><span class="n">_stat</span><span class="p">))</span>
+  <span class="p">{</span>
+    <span class="c1">// Note that if we bail out here, ~file_handle() will correctly call ::close()
+</span><span class="c1"></span>    <span class="k">return</span> <span class="p">{</span><span class="n">errno</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">system_category</span><span class="p">()};</span>
+  <span class="p">}</span>
+
+  <span class="c1">// Returning ret directly is an area full of compiler specific behaviour quirks,
+</span><span class="c1"></span>  <span class="c1">// so be explicit by wrapping into an initialiser list with embedded move.
+</span><span class="c1"></span>  <span class="k">return</span> <span class="p">{</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">ret</span><span class="p">)};</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/constructors.cpp#L115" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The static member function implementing phase 2 firstly calls phase 1
+which puts the object into a legally destructible state. We then
+proceed to implement phase 2 of construction, filling in the various
+parts as we go, reporting via <code>result</code> any failures.</p>
+
+<div class="notices note" style="background: url('../../../images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>Remember that <code>operator new</code> has a non-throwing form, <code>new(std::nothrow)</code>.</p>
+</div>
+</div>
+
+
+<p>For the final return, in theory we could just <code>return ret</code> and
+depending on the C++ version currently in force, it might work
+via move, or via copy, or it might refuse to compile. You can
+of course type lots of boilerplate to be explicit, but this use
+via initialiser list is a reasonable balance of explicitness
+versus brevity, and it should generate minimum overhead code
+irrespective of compiler, C++ version, or any other factor.</p>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors/file_handle.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/constructors/metaprogrammg1.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/constructors/two-phase-init.html b/doc/html/tutorial/advanced/constructors/two-phase-init.html
new file mode 100644
index 000000000..fa22ee2a4
--- /dev/null
+++ b/doc/html/tutorial/advanced/constructors/two-phase-init.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Two phase construction - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/constructors/file_handle.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Two phase construction</h1></div></div></div>
+  <p>The first thing to do is to break your object&rsquo;s construction into two phases:</p>
+
+<ol>
+<li><p>Place the object into a state where it can be legally destructed
+without doing any initialisation which could throw an exception (i.e. everything
+done in phase 1 is <code>constexpr</code>). This phase usually involves initialising member
+variables to various default values, most often using default member initialisers.
+Most standard C++ library objects
+and containers have <code>constexpr</code> constructors, and thus can be initialised
+during phase 1. If you need to initialise a member variable without
+a <code>constexpr</code> constructor, 
+<a href="https://en.cppreference.com/w/cpp/utility/optional" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> <code>std::optional&lt;T&gt;</code></a>
+ is the usual workaround.</p></li>
+
+<li><p>Do the remainder of the construction, the parts which could fail.
+Because phase 1 placed the object into a legally destructible state,
+it is usually the case that one can bail out during phase 2 and the
+destructor will clean things up correctly.</p></li>
+</ol>
+
+<p>The phase 1 construction will be placed into a <em>private</em> <code>constexpr</code>
+constructor so nobody external can call it. The phase 2 construction will be placed into a static
+member initialisation function which returns a <code>result</code> with either
+the successfully constructed object, or the cause of any failure to
+construct the object.</p>
+
+<p>Finally, as a phase 3,
+some simple metaprogramming will implement a <code>make&lt;T&gt;{Args...}()</code>
+free function which will construct any object <code>T</code> by calling its
+static initialisation function with <code>Args...</code> and returning the
+<code>result</code> returned. This isn&rsquo;t as nice as calling <code>T(Args...)</code> directly,
+but it&rsquo;s not too bad in practice. And more importantly, it lets you
+write generic code which can construct any unknown object which
+fails via returning <code>result</code>, completely avoiding C++ exception throws.</p>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/constructors/file_handle.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/hooks.html b/doc/html/tutorial/advanced/hooks.html
new file mode 100644
index 000000000..0de4d19d8
--- /dev/null
+++ b/doc/html/tutorial/advanced/hooks.html
@@ -0,0 +1,139 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Hooking events - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/advanced/constructors/metaprogrammg3.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/advanced.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/advanced/hooks/keeping_state.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Hooking events</h1></div></div></div>
+<p>Outcome provides multiple methods for user code to intercept various lifecycle events which occur.
+The deepest method is simply to inherit from <code>basic_result</code> or <code>basic_outcome</code>, and override member functions,
+for which you will need to study the source code as that form of customisation is out of scope for this tutorial.</p>
+
+<p>Another option is to supply a custom <code>NoValuePolicy</code>
+(<a href="../../tutorial/essential/no-value/custom.html">see preceding section</a>).
+From Outcome v2.2 onwards, intercepting construction, copies and moves <em>requires</em>
+a custom <code>NoValuePolicy</code>.</p>
+
+<p>Before Outcome v2.2, there was an ADL discovered event hook mechanism for intercepting
+construction, copies and moves (it was found to be brittle, error prone and surprising
+in empirical use, which is why it was replaced). The ADL discovered event hooks still
+function in Outcome v2.2 and later if <a href="../../reference/macros/enable_legacy_support_for.html" class="api-reference"><code>BOOST_OUTCOME_ENABLE_LEGACY_SUPPORT_FOR</code></a>
+
+is set to less than <code>220</code> to enable emulation.</p>
+
+<p>You will note that the naming is simply one of <code>hook_*</code> =&gt; <code>on_*</code>, the parameters remain
+identical. This eases porting code from Outcome v2.1 to v2.2, it&rsquo;s usually just a case
+of copy-pasting the ADL hook code into a custom <code>NoValuePolicy</code>.</p>
+
+<hr />
+
+<p><strong>Policy set event hooks (Outcome v2.2 onwards):</strong></p>
+
+<ul>
+<li>Constructed
+
+<ul>
+<li><a href="../../reference/policies/base/on_result_construction.html" class="api-reference"><code>void on_result_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+<li><a href="../../reference/policies/base/on_outcome_construction.html" class="api-reference"><code>void on_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+</ul></li>
+<li>In-place constructed
+
+<ul>
+<li><a href="../../reference/policies/base/on_result_in_place_construction.html" class="api-reference"><code>void on_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+</li>
+<li><a href="../../reference/policies/base/on_outcome_in_place_construction.html" class="api-reference"><code>void on_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+</li>
+</ul></li>
+<li>Copied
+
+<ul>
+<li><a href="../../reference/policies/base/on_result_copy_construction.html" class="api-reference"><code>void on_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+<li><a href="../../reference/policies/base/on_outcome_copy_construction.html" class="api-reference"><code>void on_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+</ul></li>
+<li>Moved
+
+<ul>
+<li><a href="../../reference/policies/base/on_result_move_construction.html" class="api-reference"><code>void on_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+<li><a href="../../reference/policies/base/on_outcome_move_construction.html" class="api-reference"><code>void on_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+</ul></li>
+</ul>
+
+<hr />
+
+<p><strong>ADL discovered event hooks (before Outcome v2.2):</strong></p>
+
+<ul>
+<li>Constructed
+
+<ul>
+<li><a href="../../reference/functions/hooks/hook_result_construction.html" class="api-reference"><code>void hook_result_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+<li><a href="../../reference/functions/hooks/hook_outcome_construction.html" class="api-reference"><code>void hook_outcome_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+</ul></li>
+<li>In-place constructed
+
+<ul>
+<li><a href="../../reference/functions/hooks/hook_result_in_place_construction.html" class="api-reference"><code>void hook_result_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+</li>
+<li><a href="../../reference/functions/hooks/hook_outcome_in_place_construction.html" class="api-reference"><code>void hook_outcome_in_place_construction(T *, in_place_type_t&lt;U&gt;, Args &amp;&amp;...) noexcept</code></a>
+</li>
+</ul></li>
+<li>Copied
+
+<ul>
+<li><a href="../../reference/functions/hooks/hook_result_copy_construction.html" class="api-reference"><code>void hook_result_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+<li><a href="../../reference/functions/hooks/hook_outcome_copy_construction.html" class="api-reference"><code>void hook_outcome_copy_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+</ul></li>
+<li>Moved
+
+<ul>
+<li><a href="../../reference/functions/hooks/hook_result_move_construction.html" class="api-reference"><code>void hook_result_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+<li><a href="../../reference/functions/hooks/hook_outcome_move_construction.html" class="api-reference"><code>void hook_outcome_move_construction(T *, U &amp;&amp;) noexcept</code></a>
+</li>
+</ul></li>
+</ul>
+
+<hr />
+
+<p>One criticism often levelled against library-based exception throw alternatives is that they do
+not provide as rich a set of facilities as C++ exception throws. This section shows
+you how to configure Outcome, using the event hooks, to take a stack backtrace on
+construction of an errored <code>result&lt;T, error_code&gt;</code>,
+and if that <code>result&lt;T, error_code&gt;</code> should ever be converted into an <code>outcome&lt;T, error_code, std::exception_ptr&gt;</code>,
+a custom <code>std::exception_ptr</code> will be just-in-time synthesised consisting of the <code>std::system_error</code>
+for the error code, plus an expanded message string containing the stack backtrace of where
+the error originally occurred.</p>
+
+<p>One can see the use case for such a configuration where low-level, deterministic,
+fixed latency code is built with <code>result</code>, and it dovetails into higher-level
+application code built with <code>outcome</code> where execution time guarantees are not
+important, and thus where a <code>malloc</code> is okay. One effectively has constructed a
+&ldquo;lazy indeterminism&rdquo;, or &ldquo;just-in-time indeterminism&rdquo; mechanism for handling
+failure, but with all the rich information of throwing C++ exceptions.</p>
+
+
+
+        </div><p><small>Last revised: September 16, 2020 at 11:58:04 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/advanced/constructors/metaprogrammg3.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/advanced.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/advanced/hooks/keeping_state.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/hooks/adl_bridging.html b/doc/html/tutorial/advanced/hooks/adl_bridging.html
new file mode 100644
index 000000000..aca536a68
--- /dev/null
+++ b/doc/html/tutorial/advanced/hooks/adl_bridging.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>ADL bridging - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/hooks/keeping_state.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/hooks/hook_result.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">ADL bridging</h1></div></div></div>
+  <div class="notices note" style="background: url('../../../images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>In Outcome v2.2 the ADL-based event hooks were replaced with policy-based event hooks (next page).
+The code in this section is still valid in v2.2 onwards, it&rsquo;s just that ADL is no longer used
+to find the hooks.</p>
+</div>
+</div>
+
+
+<p>In a previous section, we used the <code>failure_info</code> type to create
+the ADL bridge into the namespace where the ADL discovered <a href="../../../reference/functions/policy.html"><code>outcome_throw_as_system_error_with_payload()</code></a> function was to be found.</p>
+
+<p>Here we do the same, but more directly by creating a thin clone of <code>std::error_code</code>
+into the local namespace. This ensures that this namespace will be searched by the
+compiler when discovering the event hooks (Outcome v2.1 and earlier only).</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">error_code_extended</span>
+<span class="p">{</span>
+  <span class="c1">// Use the error_code type as the ADL bridge for the hooks by creating a type here
+</span><span class="c1"></span>  <span class="c1">// It can be any type that your localised result uses, including the value type but
+</span><span class="c1"></span>  <span class="c1">// by localising the error code type here you prevent nasty surprises later when the
+</span><span class="c1"></span>  <span class="c1">// value type you use doesn&#39;t trigger the ADL bridge.
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="nl">error_code</span> <span class="p">:</span> <span class="k">public</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span>
+  <span class="p">{</span>
+    <span class="c1">// literally passthrough
+</span><span class="c1"></span>    <span class="k">using</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span><span class="o">::</span><span class="n">error_code</span><span class="p">;</span>
+    <span class="n">error_code</span><span class="p">()</span> <span class="o">=</span> <span class="k">default</span><span class="p">;</span>
+    <span class="n">error_code</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">)</span>
+        <span class="o">:</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span><span class="p">(</span><span class="n">ec</span><span class="p">)</span>
+    <span class="p">{</span>
+    <span class="p">}</span>
+  <span class="p">};</span>
+
+  <span class="c1">// Localise result and outcome to using the local error_code so this namespace gets looked up for the hooks
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">R</span><span class="o">&gt;</span> <span class="k">using</span> <span class="n">result</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">R</span><span class="p">,</span> <span class="n">error_code</span><span class="o">&gt;</span><span class="p">;</span>
+  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">R</span><span class="o">&gt;</span> <span class="k">using</span> <span class="n">outcome</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">R</span><span class="p">,</span> <span class="n">error_code</span> <span class="cm">/*, std::exception_ptr */</span><span class="o">&gt;</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/error_code_extended.cpp#L95" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>For convenience, we template alias local copies of <code>result</code> and <code>outcome</code> in this
+namespace bound to the ADL bridging <code>error_code</code>.</p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/hooks/keeping_state.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/hooks/hook_result.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/hooks/hook_outcome.html b/doc/html/tutorial/advanced/hooks/hook_outcome.html
new file mode 100644
index 000000000..fee97948a
--- /dev/null
+++ b/doc/html/tutorial/advanced/hooks/hook_outcome.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Hook outcome - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/hooks/poke_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Hook outcome</h1></div></div></div>
+  <p>The final step is to add event hooks for the very specific case of
+when our localised <code>outcome</code> is copy or move constructed from our localised <code>result</code>.</p>
+
+<p>You ought to be very careful that the <code>noexcept</code>-ness of these matches the <code>noexcept</code>-ness
+of the types in the <code>outcome</code>. You may have noticed that <code>poke_exception()</code> creates
+a <code>std::string</code> and appends to it. This can throw an exception. If the copy and/or
+move constructors of <code>T</code>, <code>EC</code> and <code>EP</code> are <code>noexcept</code>, then so will be <code>outcome</code>&rsquo;s
+copy and/or move constructor. Thus if <code>poke_exception()</code> throws, instant program
+termination would occur, which is bad.</p>
+
+<p>We avoid that problem in this case by wrapping <code>poke_exception()</code> in a <code>try...catch</code>
+which throws away any exceptions thrown. For Outcome before v2.2, these specially
+named free functions must be placed into a namespace which is ADL searched:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">error_code_extended</span>
+<span class="p">{</span>
+  <span class="c1">// Specialise the outcome copy and move conversion hook for when our localised result
+</span><span class="c1"></span>  <span class="c1">// is used as the source for copy construction our localised outcome
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">U</span><span class="o">&gt;</span> <span class="kr">inline</span> <span class="kt">void</span> <span class="n">hook_outcome_copy_construction</span><span class="p">(</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span> <span class="o">*</span><span class="n">res</span><span class="p">,</span> <span class="k">const</span> <span class="n">result</span><span class="o">&lt;</span><span class="n">U</span><span class="o">&gt;</span> <span class="o">&amp;</span> <span class="cm">/*unused*/</span><span class="p">)</span> <span class="k">noexcept</span>
+  <span class="p">{</span>
+    <span class="k">try</span>
+    <span class="p">{</span>
+      <span class="c1">// when copy constructing from a result&lt;T&gt;, poke in an exception
+</span><span class="c1"></span>      <span class="n">poke_exception</span><span class="p">(</span><span class="n">res</span><span class="p">);</span>
+    <span class="p">}</span>
+    <span class="k">catch</span><span class="p">(...)</span>
+    <span class="p">{</span>
+      <span class="c1">// Do nothing
+</span><span class="c1"></span>    <span class="p">}</span>
+  <span class="p">}</span>
+  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">U</span><span class="o">&gt;</span> <span class="kr">inline</span> <span class="kt">void</span> <span class="n">hook_outcome_move_construction</span><span class="p">(</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span> <span class="o">*</span><span class="n">res</span><span class="p">,</span> <span class="n">result</span><span class="o">&lt;</span><span class="n">U</span><span class="o">&gt;</span> <span class="o">&amp;&amp;</span> <span class="cm">/*unused*/</span><span class="p">)</span> <span class="k">noexcept</span>
+  <span class="p">{</span>
+    <span class="k">try</span>
+    <span class="p">{</span>
+      <span class="c1">// when move constructing from a result&lt;T&gt;, poke in an exception
+</span><span class="c1"></span>      <span class="n">poke_exception</span><span class="p">(</span><span class="n">res</span><span class="p">);</span>
+    <span class="p">}</span>
+    <span class="k">catch</span><span class="p">(...)</span>
+    <span class="p">{</span>
+      <span class="c1">// Do nothing
+</span><span class="c1"></span>    <span class="p">}</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/error_code_extended.cpp#L182" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>For Outcome v2.2 and later, these functions must be placed into a custom no value
+policy with the names <code>on_outcome_copy_construction()</code> and <code>on_outcome_move_construction()</code>
+respectively. As with before, the implementation of the functions is identical, just
+the name and location has changed.</p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/hooks/poke_exception.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/hooks/hook_result.html b/doc/html/tutorial/advanced/hooks/hook_result.html
new file mode 100644
index 000000000..f7cee9621
--- /dev/null
+++ b/doc/html/tutorial/advanced/hooks/hook_result.html
@@ -0,0 +1,86 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Hook result - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/hooks/adl_bridging.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/hooks/poke_exception.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Hook result</h1></div></div></div>
+  <p>We now tell Outcome that for every instance of our localised <code>result&lt;T&gt;</code>, that
+on failure construction only, we want custom code to be run which increments the current
+slot in TLS storage and writes the current stack backtrace into it.</p>
+
+<p>For Outcome before v2.2, we must do this by inserting a specially named free function into
+a namespace searched by ADL:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">error_code_extended</span>
+<span class="p">{</span>
+  <span class="c1">// Specialise the result construction hook for our localised result
+</span><span class="c1"></span>  <span class="c1">// We hook any non-copy, non-move, non-inplace construction, capturing a stack backtrace
+</span><span class="c1"></span>  <span class="c1">// if the result is errored.
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">U</span><span class="o">&gt;</span> <span class="kr">inline</span> <span class="kt">void</span> <span class="n">hook_result_construction</span><span class="p">(</span><span class="n">result</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span> <span class="o">*</span><span class="n">res</span><span class="p">,</span> <span class="n">U</span> <span class="o">&amp;&amp;</span> <span class="cm">/*unused*/</span><span class="p">)</span> <span class="k">noexcept</span>
+  <span class="p">{</span>
+    <span class="k">if</span><span class="p">(</span><span class="n">res</span><span class="o">-&gt;</span><span class="n">has_error</span><span class="p">())</span>
+    <span class="p">{</span>
+      <span class="c1">// Grab the next extended info slot in the TLS
+</span><span class="c1"></span>      <span class="n">extended_error_info</span> <span class="o">&amp;</span><span class="n">eei</span> <span class="o">=</span> <span class="n">mythreadlocaldata</span><span class="p">().</span><span class="n">next</span><span class="p">();</span>
+
+      <span class="c1">// Write the index just grabbed into the spare uint16_t
+</span><span class="c1"></span>      <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">hooks</span><span class="o">::</span><span class="n">set_spare_storage</span><span class="p">(</span><span class="n">res</span><span class="p">,</span> <span class="n">mythreadlocaldata</span><span class="p">().</span><span class="n">current</span> <span class="o">-</span> <span class="mi">1</span><span class="p">);</span>
+
+      <span class="c1">// Capture a backtrace into my claimed extended info slot in the TLS
+</span><span class="c1"></span>      <span class="n">eei</span><span class="p">.</span><span class="n">items</span> <span class="o">=</span> <span class="o">::</span><span class="n">backtrace</span><span class="p">(</span><span class="n">eei</span><span class="p">.</span><span class="n">backtrace</span><span class="p">.</span><span class="n">data</span><span class="p">(),</span> <span class="n">eei</span><span class="p">.</span><span class="n">backtrace</span><span class="p">.</span><span class="n">size</span><span class="p">());</span>
+    <span class="p">}</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/error_code_extended.cpp#L119" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>For Outcome v2.2 and later, we must do this by using a custom no value policy which contains
+a function named <code>on_result_construction()</code>. The function implementation is identical between
+both mechanisms, just the name and placement of the function declaration differs.</p>
+
+<p>The only non-obvious part above is the call to <a href="../../../reference/functions/hooks/set_spare_storage.html" class="api-reference"><code>void set_spare_storage(basic_result|basic_outcome *, uint16_t) noexcept</code></a>
+.</p>
+
+<p>Both <code>result</code> and <code>outcome</code> keep their internal state metadata in a <code>uint32_t</code>,
+half of which is not used by Outcome. As it can be very useful to keep a small
+unique number attached to any particular <code>result</code> or <code>outcome</code> instance, we
+permit user code to set those sixteen bits to anything they feel like.
+The corresponding function to retrieve those sixteen bits is <a href="../../../reference/functions/hooks/spare_storage.html" class="api-reference"><code>uint16_t spare_storage(const basic_result|basic_outcome *) noexcept</code></a>
+.</p>
+
+<p>The state of the sixteen bits of spare storage are ignored during comparison operations.</p>
+
+<p>The sixteen bits of spare storage propagate during the following operations:</p>
+
+<ol>
+<li>Copy and move construction between <code>result</code>&rsquo;s.</li>
+<li>Copy and move construction between <code>outcome</code>&rsquo;s.</li>
+<li>Copy and move construction from a <code>result</code> to an <code>outcome</code>.</li>
+<li>Converting copy and move constructions for all the above.</li>
+<li>Assignment for all of the above.</li>
+</ol>
+
+<p>They are NOT propagated in these operations:</p>
+
+<ol>
+<li>Any conversion or translation which goes through a <code>failure_type</code> or <code>success_type</code>.</li>
+<li>Any conversion or translation which goes through a <code>ValueOrError</code> concept match.</li>
+<li>Any unpacking or repacking of value/error/exception e.g. a manual repack of an
+<code>outcome</code> into a <code>result</code>.</li>
+</ol>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/hooks/adl_bridging.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/hooks/poke_exception.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/hooks/keeping_state.html b/doc/html/tutorial/advanced/hooks/keeping_state.html
new file mode 100644
index 000000000..52ec8a207
--- /dev/null
+++ b/doc/html/tutorial/advanced/hooks/keeping_state.html
@@ -0,0 +1,78 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Keeping state - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/hooks/adl_bridging.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Keeping state</h1></div></div></div>
+  <p>The first thing we are going to need is somewhere to store the stack backtrace.
+We could take the easier route and simply store it into an allocated block and
+keep the pointer as a custom payload in a <code>result&lt;T, std::pair&lt;error_code, std::unique_ptr&lt;stack_backtrace&gt;&gt;&gt;</code>
+(see previous section on <a href="../../payload">Custom payloads</a>). But let us assume that we care so deeply about bounded execution times
+that ever calling <code>malloc</code> is unacceptable.</p>
+
+<p>We therefore are going to need some completely static and trivially typed storage
+perhaps kept per-thread to avoid the need to keep mutexes.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="cm">/* Outcome&#39;s hook mechanism works vis ADL, so we will need a custom namespace
+</span><span class="cm">to ensure the hooks apply only to the types declared in this namespace only
+</span><span class="cm">*/</span>
+<span class="k">namespace</span> <span class="n">error_code_extended</span>
+<span class="p">{</span>
+  <span class="c1">// The extra error information we will keep
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="n">extended_error_info</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">array</span><span class="o">&lt;</span><span class="kt">void</span> <span class="o">*</span><span class="p">,</span> <span class="mi">16</span><span class="o">&gt;</span> <span class="n">backtrace</span><span class="p">;</span>  <span class="c1">// The backtrace
+</span><span class="c1"></span>    <span class="n">size_t</span> <span class="n">items</span><span class="p">;</span>                      <span class="c1">// Items in backtrace array which are valid
+</span><span class="c1"></span>  <span class="p">};</span>
+  <span class="k">struct</span> <span class="n">mythreadlocaldata_t</span>
+  <span class="p">{</span>
+    <span class="c1">// Keep 16 slots of extended error info as a ringbuffer
+</span><span class="c1"></span>    <span class="n">extended_error_info</span> <span class="n">slots</span><span class="p">[</span><span class="mi">16</span><span class="p">];</span>
+    <span class="c1">// The current oldest slot
+</span><span class="c1"></span>    <span class="n">uint16_t</span> <span class="n">current</span><span class="p">{</span><span class="mi">0</span><span class="p">};</span>
+
+    <span class="c1">// Return the oldest slot
+</span><span class="c1"></span>    <span class="n">extended_error_info</span> <span class="o">&amp;</span><span class="n">next</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="n">slots</span><span class="p">[(</span><span class="n">current</span><span class="o">++</span><span class="p">)</span> <span class="o">%</span> <span class="mi">16</span><span class="p">];</span> <span class="p">}</span>
+
+    <span class="c1">// Retrieve a previously stored slot, detecting if it is stale
+</span><span class="c1"></span>    <span class="n">extended_error_info</span> <span class="o">*</span><span class="n">get</span><span class="p">(</span><span class="n">uint16_t</span> <span class="n">idx</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="c1">// If the idx is stale, return not found
+</span><span class="c1"></span>      <span class="k">if</span><span class="p">(</span><span class="n">idx</span> <span class="o">-</span> <span class="n">current</span> <span class="o">&gt;=</span> <span class="mi">16</span><span class="p">)</span>
+      <span class="p">{</span>
+        <span class="k">return</span> <span class="k">nullptr</span><span class="p">;</span>
+      <span class="p">}</span>
+      <span class="k">return</span> <span class="n">slots</span> <span class="o">+</span> <span class="p">(</span><span class="n">idx</span> <span class="o">%</span> <span class="mi">16</span><span class="p">);</span>
+    <span class="p">}</span>
+  <span class="p">};</span>
+
+  <span class="c1">// Meyers&#39; singleton returning a thread local data structure for this thread
+</span><span class="c1"></span>  <span class="kr">inline</span> <span class="n">mythreadlocaldata_t</span> <span class="o">&amp;</span><span class="n">mythreadlocaldata</span><span class="p">()</span>
+  <span class="p">{</span>
+    <span class="k">static</span> <span class="k">thread_local</span> <span class="n">mythreadlocaldata_t</span> <span class="n">v</span><span class="p">;</span>
+    <span class="k">return</span> <span class="n">v</span><span class="p">;</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/error_code_extended.cpp#L52" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The extended error info is kept in a sixteen item long, thread local, ring buffer. We continuously
+increment the current index pointer which is a 16 bit value which will wrap after
+65,535. This lets us detect an attempt to access recycled storage, and thus return
+item-not-found instead of the wrong extended error info.</p>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/hooks/adl_bridging.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/hooks/poke_exception.html b/doc/html/tutorial/advanced/hooks/poke_exception.html
new file mode 100644
index 000000000..98626a918
--- /dev/null
+++ b/doc/html/tutorial/advanced/hooks/poke_exception.html
@@ -0,0 +1,100 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Custom exception ptr - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/hooks/hook_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/hooks/hook_outcome.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Custom exception ptr</h1></div></div></div>
+  <p>If you merely want <code>result</code> to capture stack backtraces without calling a memory allocator
+and retaining any triviality of copy which is important for optimisation,
+you already have everything you need.</p>
+
+<p>But let&rsquo;s keep going by intercepting any
+construction of our localised <code>outcome</code> from our localised <code>result</code>, retrieving any
+stored backtrace and using it to synthesise an exception ptr with a message text
+including the backtrace. Firstly let us look at the function which synthesises
+the exception ptr:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">error_code_extended</span>
+<span class="p">{</span>
+  <span class="c1">// Synthesise a custom exception_ptr from the TLS slot and write it into the outcome
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">R</span><span class="o">&gt;</span> <span class="kr">inline</span> <span class="kt">void</span> <span class="n">poke_exception</span><span class="p">(</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">R</span><span class="o">&gt;</span> <span class="o">*</span><span class="n">o</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="k">if</span><span class="p">(</span><span class="n">o</span><span class="o">-&gt;</span><span class="n">has_error</span><span class="p">())</span>
+    <span class="p">{</span>
+      <span class="n">extended_error_info</span> <span class="o">*</span><span class="n">eei</span> <span class="o">=</span> <span class="n">mythreadlocaldata</span><span class="p">().</span><span class="n">get</span><span class="p">(</span><span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">hooks</span><span class="o">::</span><span class="n">spare_storage</span><span class="p">(</span><span class="n">o</span><span class="p">));</span>
+      <span class="k">if</span><span class="p">(</span><span class="n">eei</span> <span class="o">!=</span> <span class="k">nullptr</span><span class="p">)</span>
+      <span class="p">{</span>
+        <span class="c1">// Make a custom string for the exception
+</span><span class="c1"></span>        <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">str</span><span class="p">(</span><span class="n">o</span><span class="o">-&gt;</span><span class="n">error</span><span class="p">().</span><span class="n">message</span><span class="p">());</span>
+        <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34; [&#34;</span><span class="p">);</span>
+        <span class="k">struct</span> <span class="n">unsymbols</span>  <span class="c1">// RAII cleaner for symbols
+</span><span class="c1"></span>        <span class="p">{</span>
+          <span class="kt">char</span> <span class="o">**</span><span class="n">_</span><span class="p">{</span><span class="k">nullptr</span><span class="p">};</span>
+          <span class="o">~</span><span class="n">unsymbols</span><span class="p">()</span> <span class="p">{</span> <span class="o">::</span><span class="n">free</span><span class="p">(</span><span class="n">_</span><span class="p">);</span> <span class="p">}</span>
+        <span class="p">}</span> <span class="n">symbols</span><span class="p">{</span><span class="o">::</span><span class="n">backtrace_symbols</span><span class="p">(</span><span class="n">eei</span><span class="o">-&gt;</span><span class="n">backtrace</span><span class="p">.</span><span class="n">data</span><span class="p">(),</span> <span class="n">eei</span><span class="o">-&gt;</span><span class="n">items</span><span class="p">)};</span>
+        <span class="k">if</span><span class="p">(</span><span class="n">symbols</span><span class="p">.</span><span class="n">_</span> <span class="o">!=</span> <span class="k">nullptr</span><span class="p">)</span>
+        <span class="p">{</span>
+          <span class="k">for</span><span class="p">(</span><span class="n">size_t</span> <span class="n">n</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">n</span> <span class="o">&lt;</span> <span class="n">eei</span><span class="o">-&gt;</span><span class="n">items</span><span class="p">;</span> <span class="n">n</span><span class="o">++</span><span class="p">)</span>
+          <span class="p">{</span>
+            <span class="k">if</span><span class="p">(</span><span class="n">n</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">)</span>
+            <span class="p">{</span>
+              <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34;; &#34;</span><span class="p">);</span>
+            <span class="p">}</span>
+            <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="n">symbols</span><span class="p">.</span><span class="n">_</span><span class="p">[</span><span class="n">n</span><span class="p">]);</span>
+          <span class="p">}</span>
+        <span class="p">}</span>
+        <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34;]&#34;</span><span class="p">);</span>
+
+        <span class="c1">// Override the payload/exception member in the outcome with our synthesised exception ptr
+</span><span class="c1"></span>        <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">hooks</span><span class="o">::</span><span class="n">override_outcome_exception</span><span class="p">(</span><span class="n">o</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">make_exception_ptr</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">runtime_error</span><span class="p">(</span><span class="n">str</span><span class="p">)));</span>
+      <span class="p">}</span>
+    <span class="p">}</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/error_code_extended.cpp#L142" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>If the localised <code>outcome</code> being constructed is errored, try fetching the TLS slot
+for the unique 16-bit value in its spare storage. If that is valid, symbolise the
+stack backtrace into a string and make an exception ptr with a runtime error with
+that string. Finally, override the payload/exception member in our just-copy-constructed
+localised <code>outcome</code> with the new exception ptr.</p>
+
+<hr>
+
+<p>As the reference documentation for <a href="../../../reference/functions/hooks/override_outcome_exception.html" class="api-reference"><code>void override_outcome_exception(basic_outcome&lt;T, EC, EP, NoValuePolicy&gt; *, U &amp;&amp;) noexcept</code></a>
+
+points out, you <em>almost certainly</em> never want to use this function if there is any
+other alternative. It is worth explaining what is meant by this.</p>
+
+<p>In this section, we <em>always</em> synthesise an exception ptr from the stored state and
+error code at the exact point of transition from <code>result</code> based APIs to <code>outcome</code>
+based APIs. This is acceptable only because we know that our code enforces that
+discipline.</p>
+
+<p>If one were designing a library facility, one could not assume such discipline in the
+library user. One would probably be better off making the exception ptr synthesis
+<em>lazy</em> via a custom no-value policy which generates the stacktrace-containing error
+message only on demand e.g. <code>.exception()</code> observation, or a <code>.value()</code> observation
+where no value is available.</p>
+
+<p>Such a design is however more indeterminate than the design presented in this section,
+because the indeterminacy is less predictable than in this design. Ultimately which
+strategy you adopt depends on how important absolute determinism is to your Outcome-based
+application.</p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/hooks/hook_result.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/hooks.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/hooks/hook_outcome.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop.html b/doc/html/tutorial/advanced/interop.html
new file mode 100644
index 000000000..37bff7dc1
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Interoperation - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/advanced/hooks/hook_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/advanced.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/advanced/interop/problem.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Interoperation</h1></div></div></div>
+<p>This is the final section of the tutorial, and it is unavoidably quite lengthy
+as we are going to tie together all of the material covered in the tutorial
+so far into a single, unified, application of Outcome&rsquo;s facilities.</p>
+
+<p>One thing which Outcome solves &ndash; and which alternatives do not &ndash; is how to
+<strong>non-intrusively</strong> tie together multiple third party libraries, each using
+Outcome &ndash; or some other <code>T|E</code> implementatation like 
+<a href="https://wg21.link/P0323" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> P0323 <code>std::expected&lt;T, E&gt;</code></a>
+
+&ndash; with custom incommensurate <code>E</code> types, or indeed arbitrary return
+types which are &ldquo;split&rdquo; <code>T|E</code> return types. Solving
+this well is the <em>coup de grâce</em> of Outcome against alternative approaches
+to this problem domain,
+including <code>std::expected&lt;T, E&gt;</code>. It is the major reason why you should
+consider using Outcome over alternatives, including Expected.</p>
+
+<p>Firstly we shall explore some of the problems faced by the software
+developer when <code>T|E</code> return type based code proliferates at scale,
+where dozens of libraries may be using completely incompatible <code>T|E</code> return types.</p>
+
+<p>Secondly we shall introduce the <code>ValueOrError</code> concept support in Outcome,
+which implements a subset of the proposed <a href="https://wg21.link/P0786">WG21 <code>ValueOrError</code>
+concept framework</a>.</p>
+
+<p>Finally, we shall then step through a worked example which mocks up a realistic
+situation that the software developer may find themselves in: tying
+together disparate third party libraries, whose source code cannot be
+modified, into an application-wide, mixed-mode <code>T|E</code> and exception
+throwing universal error handling system which is capable of
+accurately representing the original failure, but also propagating it
+in a way that the application can deal with universally.</p>
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/advanced/hooks/hook_outcome.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/advanced.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/advanced/interop/problem.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop/app-go.html b/doc/html/tutorial/advanced/interop/app-go.html
new file mode 100644
index 000000000..448e034ad
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/app-go.html
@@ -0,0 +1,86 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>In use - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app-map-tidylib.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/conclusion.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">In use</h1></div></div></div>
+  <p>This is how you might now write application code using these three libraries:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">app</span>
+<span class="p">{</span>
+  <span class="c1">// A markup function to indicate when we are ValueOrError converting
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span> <span class="kr">inline</span> <span class="n">outcome</span><span class="o">&lt;</span><span class="k">typename</span> <span class="n">T</span><span class="o">::</span><span class="n">value_type</span><span class="o">&gt;</span> <span class="n">ext</span><span class="p">(</span><span class="n">T</span> <span class="o">&amp;&amp;</span><span class="n">v</span><span class="p">)</span>
+  <span class="p">{</span>  <span class="c1">//
+</span><span class="c1"></span>    <span class="k">return</span> <span class="n">outcome</span><span class="o">&lt;</span><span class="k">typename</span> <span class="n">T</span><span class="o">::</span><span class="n">value_type</span><span class="o">&gt;</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">v</span><span class="p">));</span>
+  <span class="p">}</span>
+
+  <span class="n">outcome</span><span class="o">&lt;</span><span class="kt">void</span><span class="o">&gt;</span> <span class="n">go</span><span class="p">()</span>  <span class="c1">// NOT noexcept, this can throw STL exceptions e.g. bad_alloc
+</span><span class="c1"></span>  <span class="p">{</span>
+    <span class="c1">// Note that explicit construction is required when converting between differing types
+</span><span class="c1"></span>    <span class="c1">// of outcome and result. This makes it explicit what you intend to do as conversion
+</span><span class="c1"></span>    <span class="c1">// may be a lot more expensive than moves.
+</span><span class="c1"></span>
+    <span class="c1">// Try to GET this URL. If an unsuccessful HTTP status is returned, serialise a string
+</span><span class="c1"></span>    <span class="c1">// containing a description of the HTTP status code and the URL which failed, storing
+</span><span class="c1"></span>    <span class="c1">// that into a httplib_error exception type which is stored as an exception ptr. The
+</span><span class="c1"></span>    <span class="c1">// TRY operation below will return that exception ptr to be rethrown in the caller.
+</span><span class="c1"></span>    <span class="c1">// Otherwise the fetched data is returned in a std::string data.
+</span><span class="c1"></span>    <span class="n">BOOST_OUTCOME_TRY</span><span class="p">(</span><span class="k">auto</span> <span class="n">data</span><span class="p">,</span> <span class="n">ext</span><span class="p">(</span><span class="n">httplib</span><span class="o">::</span><span class="n">get</span><span class="p">(</span><span class="s">&#34;http://www.nedproductions.biz/&#34;</span><span class="p">)));</span>
+    <span class="n">string_view</span> <span class="nf">data_view</span><span class="p">(</span><span class="n">data</span><span class="p">);</span>
+
+    <span class="c1">// HTML tidy the fetched data. If the C library fails due to an error corresponding to
+</span><span class="c1"></span>    <span class="c1">// a standard library exception type, throw that. Otherwise, synthesise an exception
+</span><span class="c1"></span>    <span class="c1">// ptr of type tidylib_error which stores the error code returned in an error code with
+</span><span class="c1"></span>    <span class="c1">// generic category (i.e. errno domain).
+</span><span class="c1"></span>    <span class="c1">// TRY operation below will return that exception ptr to be rethrown in the caller.
+</span><span class="c1"></span>    <span class="c1">// Otherwise the tidied data is returned into holdmem, with the string view updated to
+</span><span class="c1"></span>    <span class="c1">// point at the tidied data.
+</span><span class="c1"></span>    <span class="n">BOOST_OUTCOME_TRY</span><span class="p">(</span><span class="k">auto</span> <span class="n">holdmem</span><span class="p">,</span> <span class="n">ext</span><span class="p">(</span><span class="n">tidy_html</span><span class="p">(</span><span class="n">data_view</span><span class="p">)));</span>
+
+    <span class="c1">// Write the tidied data to some file. If the write fails, synthesise a filesystem_error
+</span><span class="c1"></span>    <span class="c1">// exception ptr exactly as if one called filelib::write_file(data_view).value().
+</span><span class="c1"></span>    <span class="n">BOOST_OUTCOME_TRY</span><span class="p">(</span><span class="k">auto</span> <span class="n">written</span><span class="p">,</span> <span class="n">ext</span><span class="p">(</span><span class="n">filelib</span><span class="o">::</span><span class="n">write_file</span><span class="p">(</span><span class="n">data_view</span><span class="p">)));</span>
+    <span class="k">return</span> <span class="nf">success</span><span class="p">();</span>
+  <span class="p">}</span>
+<span class="p">}</span>  <span class="c1">// namespace app
+</span><span class="c1"></span></code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/finale.cpp#L377" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The curiosity will be surely the <code>ext()</code> markup function, which needs
+explaining. It was felt
+important during Outcome&rsquo;s design that <code>value_or_error</code> conversions never
+be implicit, as they almost always represent a transition across an
+ABI or semantic boundary. They are also usually non-trivial to implement
+and compile, and it was felt important that the programmer ought to
+always mark the semantic boundary transition at the point of every use,
+as considerable amounts of code may execute.</p>
+
+<p>How the end user chooses to mark up their code is up to them, however
+above we use a simple <code>ext()</code> function to mark up that the function
+being called is <em>external</em> to the application. This ticks our box of
+requiring the documentation, at the point of use, of every transition
+in failure handling boundaries.</p>
+
+<p>Note that we are able to use <code>TRY</code> as normal throughout this function.
+Everything &ldquo;just works&rdquo;.</p>
+
+<p>And most especially note that we never, <strong>at any stage</strong>, needed to modify
+the source code of <code>httplib</code>, <code>tidylib</code> nor <code>filelib</code>, nor inject
+custom things into their namespaces. This entire worked example was
+achieved solely by <code>app</code> based customisation points, and via <code>convert</code>.</p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app-map-tidylib.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/conclusion.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop/app-map-filelib.html b/doc/html/tutorial/advanced/interop/app-map-filelib.html
new file mode 100644
index 000000000..320f797ad
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/app-map-filelib.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Mapping the File I/O library into the Application - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app-map-httplib2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app-map-tidylib.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Mapping the File I/O library into the Application</h1></div></div></div>
+  <p>To handle the File I/O library, once again we turn to custom <code>ValueOrError</code>
+converters:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// Inject custom ValueOrError conversion
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_V2_NAMESPACE_BEGIN</span>
+<span class="k">namespace</span> <span class="n">convert</span>
+<span class="p">{</span>
+  <span class="c1">// Provide custom ValueOrError conversion from filelib::result&lt;U&gt;
+</span><span class="c1"></span>  <span class="c1">// into any app::outcome&lt;T&gt;
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">U</span><span class="o">&gt;</span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="n">value_or_error</span><span class="o">&lt;</span><span class="n">app</span><span class="o">::</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">filelib</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">U</span><span class="o">&gt;&gt;</span>
+  <span class="p">{</span>
+    <span class="c1">// True to indicate that this converter wants `result`/`outcome`
+</span><span class="c1"></span>    <span class="c1">// to NOT reject all other `result`
+</span><span class="c1"></span>    <span class="k">static</span> <span class="k">constexpr</span> <span class="kt">bool</span> <span class="n">enable_result_inputs</span> <span class="o">=</span> <span class="nb">true</span><span class="p">;</span>
+    <span class="c1">// False to indicate that this converter wants `outcome` to NOT
+</span><span class="c1"></span>    <span class="c1">// reject all other `outcome`
+</span><span class="c1"></span>    <span class="k">static</span> <span class="k">constexpr</span> <span class="kt">bool</span> <span class="n">enable_outcome_inputs</span> <span class="o">=</span> <span class="nb">true</span><span class="p">;</span>
+
+    <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">X</span><span class="p">,</span>                                                                              <span class="c1">//
+</span><span class="c1"></span>              <span class="k">typename</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">enable_if_t</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">is_same</span><span class="o">&lt;</span><span class="n">filelib</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">U</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">decay_t</span><span class="o">&lt;</span><span class="n">X</span><span class="o">&gt;&gt;::</span><span class="n">value</span>  <span class="c1">//
+</span><span class="c1"></span>                                          <span class="o">&amp;&amp;</span> <span class="n">std</span><span class="o">::</span><span class="n">is_constructible</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">U</span><span class="o">&gt;::</span><span class="n">value</span><span class="o">&gt;&gt;</span>                   <span class="c1">//
+</span><span class="c1"></span>    <span class="k">constexpr</span> <span class="n">app</span><span class="o">::</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span> <span class="k">operator</span><span class="p">()(</span><span class="n">X</span> <span class="o">&amp;&amp;</span><span class="n">src</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="c1">// Forward any successful value
+</span><span class="c1"></span>      <span class="k">if</span><span class="p">(</span><span class="n">src</span><span class="p">.</span><span class="n">has_value</span><span class="p">())</span>
+      <span class="p">{</span>
+        <span class="k">return</span> <span class="p">{</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">X</span><span class="o">&gt;</span><span class="p">(</span><span class="n">src</span><span class="p">).</span><span class="n">value</span><span class="p">()};</span>
+      <span class="p">}</span>
+
+      <span class="c1">// Synthesise a filesystem_error, exactly as if someone had
+</span><span class="c1"></span>      <span class="c1">// called src.value()
+</span><span class="c1"></span>      <span class="k">auto</span> <span class="o">&amp;</span><span class="n">fi</span> <span class="o">=</span> <span class="n">src</span><span class="p">.</span><span class="n">error</span><span class="p">();</span>
+      <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">try_throw_std_exception_from_error</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">);</span>  <span class="c1">// might throw
+</span><span class="c1"></span>      <span class="k">return</span> <span class="p">{</span><span class="n">std</span><span class="o">::</span><span class="n">make_exception_ptr</span><span class="p">(</span>                                  <span class="c1">//
+</span><span class="c1"></span>      <span class="n">filelib</span><span class="o">::</span><span class="n">filesystem_error</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">(),</span> <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">path1</span><span class="p">),</span> <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">path2</span><span class="p">),</span> <span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">))};</span>
+    <span class="p">}</span>
+  <span class="p">};</span>
+<span class="p">}</span>  <span class="c1">// namespace convert
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_V2_NAMESPACE_END</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/finale.cpp#L296" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Note that the conversion exactly duplicates the implementation of
+<code>throw_as_system_error_with_payload(failure_info fi)</code> from
+namespace <code>filelib</code>. In a production implementation, you probably
+ought to call that function and catch the exception it throws
+into a pointer, as that would be more long term maintainable.</p>
+
+
+        </div><p><small>Last revised: February 11, 2019 at 13:38:04 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app-map-httplib2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
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diff --git a/doc/html/tutorial/advanced/interop/app-map-httplib1.html b/doc/html/tutorial/advanced/interop/app-map-httplib1.html
new file mode 100644
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@@ -0,0 +1,97 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Mapping the HTTP library into the Application &lt;sup&gt;1&lt;/sup&gt;&frasl;&lt;sub&gt;2&lt;/sub&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app-map-httplib2.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Mapping the HTTP library into the Application <code>1/2</code></h1></div></div></div>
+  <p>Firstly, remember that we are the application writer who has the problem of
+integrating three third party libraries into our application&rsquo;s Outcome-based
+failure handling mechanism. We cannot modify those third party library
+sources; we must be <em>non-intrusive</em>.</p>
+
+<p>We start by dealing with the HTTP library. We will integrate this
+into our application by wrapping up <code>httplib::failure</code> into a custom
+STL exception type. We then type erase it into an <code>exception_ptr</code>
+instance. Please note that this code is exclusively defined in the <code>app</code> namespace:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">app</span>
+<span class="p">{</span>
+  <span class="c1">// Specialise an exception type for httplib errors
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="nl">httplib_error</span> <span class="p">:</span> <span class="n">std</span><span class="o">::</span><span class="n">runtime_error</span>
+  <span class="p">{</span>
+    <span class="c1">// passthrough
+</span><span class="c1"></span>    <span class="k">using</span> <span class="n">std</span><span class="o">::</span><span class="n">runtime_error</span><span class="o">::</span><span class="n">runtime_error</span><span class="p">;</span>
+    <span class="n">httplib_error</span><span class="p">(</span><span class="n">httplib</span><span class="o">::</span><span class="n">failure</span> <span class="n">_failure</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">msg</span><span class="p">)</span>
+        <span class="o">:</span> <span class="n">std</span><span class="o">::</span><span class="n">runtime_error</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">msg</span><span class="p">))</span>
+        <span class="p">,</span> <span class="n">failure</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">_failure</span><span class="p">))</span>
+    <span class="p">{</span>
+    <span class="p">}</span>
+
+    <span class="c1">// the original failure
+</span><span class="c1"></span>    <span class="n">httplib</span><span class="o">::</span><span class="n">failure</span> <span class="n">failure</span><span class="p">;</span>
+  <span class="p">};</span>
+
+  <span class="c1">// Type erase httplib::result&lt;U&gt; into a httplib_error exception ptr
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">U</span><span class="o">&gt;</span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="kr">inline</span> <span class="n">std</span><span class="o">::</span><span class="n">exception_ptr</span> <span class="n">make_httplib_exception</span><span class="p">(</span><span class="k">const</span> <span class="n">httplib</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">U</span><span class="o">&gt;</span> <span class="o">&amp;</span><span class="n">src</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">str</span><span class="p">(</span><span class="s">&#34;httplib failed with error &#34;</span><span class="p">);</span>
+    <span class="k">switch</span><span class="p">(</span><span class="n">src</span><span class="p">.</span><span class="n">error</span><span class="p">().</span><span class="n">status</span><span class="p">)</span>
+    <span class="p">{</span>
+    <span class="k">case</span> <span class="n">httplib</span><span class="o">::</span><span class="n">status_code</span><span class="o">::</span><span class="nl">success</span><span class="p">:</span>
+      <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34;success&#34;</span><span class="p">);</span>
+      <span class="k">break</span><span class="p">;</span>
+    <span class="k">case</span> <span class="n">httplib</span><span class="o">::</span><span class="n">status_code</span><span class="o">::</span><span class="nl">bad_request</span><span class="p">:</span>
+      <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34;bad request&#34;</span><span class="p">);</span>
+      <span class="k">break</span><span class="p">;</span>
+    <span class="k">case</span> <span class="n">httplib</span><span class="o">::</span><span class="n">status_code</span><span class="o">::</span><span class="nl">access_denied</span><span class="p">:</span>
+      <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34;access denied&#34;</span><span class="p">);</span>
+      <span class="k">break</span><span class="p">;</span>
+    <span class="k">case</span> <span class="n">httplib</span><span class="o">::</span><span class="n">status_code</span><span class="o">::</span><span class="nl">logon_failed</span><span class="p">:</span>
+      <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34;logon failed&#34;</span><span class="p">);</span>
+      <span class="k">break</span><span class="p">;</span>
+    <span class="k">case</span> <span class="n">httplib</span><span class="o">::</span><span class="n">status_code</span><span class="o">::</span><span class="nl">forbidden</span><span class="p">:</span>
+      <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34;forbidden&#34;</span><span class="p">);</span>
+      <span class="k">break</span><span class="p">;</span>
+    <span class="k">case</span> <span class="n">httplib</span><span class="o">::</span><span class="n">status_code</span><span class="o">::</span><span class="nl">not_found</span><span class="p">:</span>
+      <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34;not found&#34;</span><span class="p">);</span>
+      <span class="k">break</span><span class="p">;</span>
+    <span class="k">case</span> <span class="n">httplib</span><span class="o">::</span><span class="n">status_code</span><span class="o">::</span><span class="nl">internal_error</span><span class="p">:</span>
+      <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34;internal error&#34;</span><span class="p">);</span>
+      <span class="k">break</span><span class="p">;</span>
+    <span class="p">}</span>
+    <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34; [url was &#34;</span><span class="p">);</span>
+    <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="n">src</span><span class="p">.</span><span class="n">error</span><span class="p">().</span><span class="n">url</span><span class="p">);</span>
+    <span class="n">str</span><span class="p">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#34;]&#34;</span><span class="p">);</span>
+    <span class="k">return</span> <span class="n">std</span><span class="o">::</span><span class="n">make_exception_ptr</span><span class="p">(</span><span class="n">httplib_error</span><span class="p">(</span><span class="n">src</span><span class="p">.</span><span class="n">error</span><span class="p">(),</span> <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">str</span><span class="p">)));</span>
+  <span class="p">}</span>
+<span class="p">}</span>  <span class="c1">// namespace app
+</span><span class="c1"></span></code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/finale.cpp#L202" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Most of the complexity in this code fragment is driven by the need to create
+some sort of descriptive string for <code>std::runtime_error</code>
+so its <code>.what()</code> returns a useful summary of the original failure. This
+is the main purpose of the <code>app::make_httplib_exception()</code> function.</p>
+
+<p>(Note that if you have Reflection in your C++ compiler, it may be possible to script
+the conversion of enum values to string representations)</p>
+
+<p>The only real thing to note about <code>app::httplib_error</code> is that it squirrels away
+the original <code>httplib::failure</code> in case that is ever needed.</p>
+
+
+        </div><p><small>Last revised: February 11, 2019 at 13:38:04 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app-map-httplib2.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
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diff --git a/doc/html/tutorial/advanced/interop/app-map-httplib2.html b/doc/html/tutorial/advanced/interop/app-map-httplib2.html
new file mode 100644
index 000000000..882d65e72
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/app-map-httplib2.html
@@ -0,0 +1,94 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Mapping the HTTP library into the Application &lt;sup&gt;2&lt;/sup&gt;&frasl;&lt;sub&gt;2&lt;/sub&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app-map-httplib1.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app-map-filelib.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Mapping the HTTP library into the Application <code>2/2</code></h1></div></div></div>
+  <p>If you remember the tutorial section on the <a href="../value-or-error"><code>value_or_error</code> Concept</a>,
+this is an example of how to implement a custom <code>value_or_error</code> Concept converter
+in Outcome:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// Inject custom ValueOrError conversion
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_V2_NAMESPACE_BEGIN</span>
+<span class="k">namespace</span> <span class="n">convert</span>
+<span class="p">{</span>
+  <span class="c1">// Provide custom ValueOrError conversion from
+</span><span class="c1"></span>  <span class="c1">// httplib::result&lt;U&gt; into any app::outcome&lt;T&gt;
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">U</span><span class="o">&gt;</span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="n">value_or_error</span><span class="o">&lt;</span><span class="n">app</span><span class="o">::</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">httplib</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">U</span><span class="o">&gt;&gt;</span>
+  <span class="p">{</span>
+    <span class="c1">// False to indicate that this converter wants `result`/`outcome`
+</span><span class="c1"></span>    <span class="c1">// to NOT reject all other `result`
+</span><span class="c1"></span>    <span class="k">static</span> <span class="k">constexpr</span> <span class="kt">bool</span> <span class="n">enable_result_inputs</span> <span class="o">=</span> <span class="nb">true</span><span class="p">;</span>
+    <span class="c1">// False to indicate that this converter wants `outcome` to NOT
+</span><span class="c1"></span>    <span class="c1">// reject all other `outcome`
+</span><span class="c1"></span>    <span class="k">static</span> <span class="k">constexpr</span> <span class="kt">bool</span> <span class="n">enable_outcome_inputs</span> <span class="o">=</span> <span class="nb">true</span><span class="p">;</span>
+
+    <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">X</span><span class="p">,</span>                                                                              <span class="c1">//
+</span><span class="c1"></span>              <span class="k">typename</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">enable_if_t</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">is_same</span><span class="o">&lt;</span><span class="n">httplib</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">U</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">decay_t</span><span class="o">&lt;</span><span class="n">X</span><span class="o">&gt;&gt;::</span><span class="n">value</span>  <span class="c1">//
+</span><span class="c1"></span>                                          <span class="o">&amp;&amp;</span> <span class="n">std</span><span class="o">::</span><span class="n">is_constructible</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">U</span><span class="o">&gt;::</span><span class="n">value</span><span class="o">&gt;&gt;</span>                   <span class="c1">//
+</span><span class="c1"></span>    <span class="k">constexpr</span> <span class="n">app</span><span class="o">::</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span> <span class="k">operator</span><span class="p">()(</span><span class="n">X</span> <span class="o">&amp;&amp;</span><span class="n">src</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="c1">// Forward any successful value, else synthesise an exception ptr
+</span><span class="c1"></span>      <span class="k">return</span> <span class="n">src</span><span class="p">.</span><span class="n">has_value</span><span class="p">()</span> <span class="o">?</span>                              <span class="c1">//
+</span><span class="c1"></span>             <span class="n">app</span><span class="o">::</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span><span class="p">{</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">X</span><span class="o">&gt;</span><span class="p">(</span><span class="n">src</span><span class="p">).</span><span class="n">value</span><span class="p">()}</span>  <span class="c1">//
+</span><span class="c1"></span>             <span class="o">:</span>
+             <span class="n">app</span><span class="o">::</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span><span class="p">{</span><span class="n">app</span><span class="o">::</span><span class="n">make_httplib_exception</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">X</span><span class="o">&gt;</span><span class="p">(</span><span class="n">src</span><span class="p">))};</span>
+    <span class="p">}</span>
+  <span class="p">};</span>
+<span class="p">}</span>  <span class="c1">// namespace convert
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_V2_NAMESPACE_END</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/finale.cpp#L257" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The first thing that you should note is that these custom converters must be injected
+directly into the <code>BOOST_OUTCOME_V2_NAMESPACE::convert</code> namespace, and they must partially
+or completely specialise <a href="../../../reference/converters/value_or_error.html" class="api-reference"><code>value_or_error&lt;T, U&gt;</code></a>
+. Here we specialise the
+converter for <code>value_or_error</code> conversions from <code>httplib::result&lt;U&gt;</code> to <code>app::outcome&lt;T&gt;</code>
+i.e. from our third party HTTP library&rsquo;s error type into our application&rsquo;s <code>outcome</code>
+type (which is unique to our application, as we hard code an <code>app</code>-local error type).</p>
+
+<p>The second thing to note is that you need to set <code>enable_result_inputs</code> and <code>enable_outcome_inputs</code>
+appropriately, otherwise <code>result</code> and <code>outcome</code> inputs will not be matched by this
+converter<sup class="footnote-ref" id="fnref:1"><a href="#fn:1">1</a></sup>. In this converter, we really do wish to convert other <code>result</code> and
+<code>outcome</code> inputs, so we mark these booleans as <code>true</code>.</p>
+
+<p>The third thing to note is the requirements on <code>operator()</code>. If the requirements are
+not met, the <code>value_or_error</code> converting constructor in <code>basic_result</code> and <code>basic_outcome</code>
+disables. Note the requirement that the decayed <code>operator()</code> input <code>X</code> matches
+<code>httplib::result&lt;U&gt;</code>, and that <code>T</code> is constructible from <code>U</code>. This means that the
+<a href="../../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" class="api-reference"><code>explicit basic_result(concepts::value_or_error&lt;T, E&gt; &amp;&amp;)</code></a>
+ and <a href="../../../reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html" class="api-reference"><code>explicit basic_outcome(concepts::value_or_error&lt;T, E&gt; &amp;&amp;)</code></a>
+
+constructors are available if, and only if, the input type is a <code>httplib::result&lt;U&gt;</code>,
+and the result&rsquo;s value type is constructible from the input&rsquo;s value type.</p>
+
+<p>If <code>operator()</code> is available, it naturally converts a <code>httplib::result&lt;U&gt;</code> into an
+<code>app::outcome&lt;T&gt;</code> by either forwarding any success as-is, or calling <code>app::make_httplib_exception()</code>
+to type erase the <code>httplib::failure</code> into an <code>app::httplib_error</code>.</p>
+<div class="footnotes">
+
+<hr />
+
+<ol>
+<li id="fn:1">Here we refer to <code>result</code> and <code>outcome</code> as defined by this specific Outcome library. If <code>result</code> or <code>outcome</code> from another Outcome implementation is seen, those <strong>always</strong> must get parsed via the <code>ValueOrError</code> matching conversion framework.
+ <a class="footnote-return" href="#fnref:1"><sup>[return]</sup></a></li>
+</ol>
+</div>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app-map-httplib1.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app-map-filelib.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop/app-map-tidylib.html b/doc/html/tutorial/advanced/interop/app-map-tidylib.html
new file mode 100644
index 000000000..afddc8334
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/app-map-tidylib.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Mapping the HTMLTidy library into the Application - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app-map-filelib.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app-go.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Mapping the HTMLTidy library into the Application</h1></div></div></div>
+  <p>Once again, we create a custom STL exception type to represent failure
+from the HTMLTidy library. We also create an <code>app</code> namespace wrapper
+for the C <code>tidy_html()</code> function which is more C++ friendly.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">app</span>
+<span class="p">{</span>
+  <span class="c1">// Specialise an exception type for tidylib errors
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="nl">tidylib_error</span> <span class="p">:</span> <span class="n">std</span><span class="o">::</span><span class="n">system_error</span>
+  <span class="p">{</span>
+    <span class="c1">// passthrough
+</span><span class="c1"></span>    <span class="k">using</span> <span class="n">std</span><span class="o">::</span><span class="n">system_error</span><span class="o">::</span><span class="n">system_error</span><span class="p">;</span>
+    <span class="n">tidylib_error</span><span class="p">()</span> <span class="o">=</span> <span class="k">default</span><span class="p">;</span>
+    <span class="k">explicit</span> <span class="nf">tidylib_error</span><span class="p">(</span><span class="kt">int</span> <span class="n">c</span><span class="p">)</span>
+        <span class="o">:</span> <span class="n">std</span><span class="o">::</span><span class="n">system_error</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">generic_category</span><span class="p">())</span>
+    <span class="p">{</span>
+    <span class="p">}</span>
+  <span class="p">};</span>
+
+  <span class="c1">// Create a C++ invoking wrapper for the tidylib C API, modifying data with the returned data,
+</span><span class="c1"></span>  <span class="c1">// returing a unique_ptr to release storage on scope exit.
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="n">call_free</span>
+  <span class="p">{</span>
+    <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span> <span class="kt">void</span> <span class="k">operator</span><span class="p">()(</span><span class="n">T</span> <span class="o">*</span><span class="n">p</span><span class="p">)</span> <span class="p">{</span> <span class="o">::</span><span class="n">free</span><span class="p">(</span><span class="n">p</span><span class="p">);</span> <span class="p">}</span>
+  <span class="p">};</span>
+  <span class="kr">inline</span> <span class="n">outcome</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o">&lt;</span><span class="kt">char</span><span class="p">,</span> <span class="n">call_free</span><span class="o">&gt;&gt;</span> <span class="n">tidy_html</span><span class="p">(</span><span class="n">string_view</span> <span class="o">&amp;</span><span class="n">data</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="kt">char</span> <span class="o">*</span><span class="n">out</span> <span class="o">=</span> <span class="k">nullptr</span><span class="p">;</span>
+    <span class="n">size_t</span> <span class="n">outlen</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
+    <span class="kt">int</span> <span class="n">errcode</span> <span class="o">=</span> <span class="o">::</span><span class="n">tidy_html</span><span class="p">(</span><span class="o">&amp;</span><span class="n">out</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">outlen</span><span class="p">,</span> <span class="n">data</span><span class="p">.</span><span class="n">data</span><span class="p">(),</span> <span class="n">data</span><span class="p">.</span><span class="n">size</span><span class="p">());</span>
+    <span class="k">if</span><span class="p">(</span><span class="n">errcode</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span>
+    <span class="p">{</span>
+      <span class="c1">// If the error code matches a standard STL exception, throw as that.
+</span><span class="c1"></span>      <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">try_throw_std_exception_from_error</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">error_code</span><span class="p">(</span><span class="n">errcode</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">generic_category</span><span class="p">()));</span>
+      <span class="c1">// Otherwise wrap the error code into a tidylib_error exception throw
+</span><span class="c1"></span>      <span class="k">return</span> <span class="n">std</span><span class="o">::</span><span class="n">make_exception_ptr</span><span class="p">(</span><span class="n">tidylib_error</span><span class="p">(</span><span class="n">errcode</span><span class="p">));</span>
+    <span class="p">}</span>
+    <span class="c1">// Reset input view to tidied html
+</span><span class="c1"></span>    <span class="n">data</span> <span class="o">=</span> <span class="n">string_view</span><span class="p">(</span><span class="n">out</span><span class="p">,</span> <span class="n">outlen</span><span class="p">);</span>
+    <span class="c1">// Return a unique ptr to release storage on scope exit
+</span><span class="c1"></span>    <span class="k">return</span> <span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o">&lt;</span><span class="kt">char</span><span class="p">,</span> <span class="n">call_free</span><span class="o">&gt;</span><span class="p">(</span><span class="n">out</span><span class="p">);</span>
+  <span class="p">}</span>
+<span class="p">}</span>  <span class="c1">// namespace app
+</span><span class="c1"></span></code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/finale.cpp#L336" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app-map-filelib.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app-go.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop/app.html b/doc/html/tutorial/advanced/interop/app.html
new file mode 100644
index 000000000..d218f0185
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/app.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>The Application - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/filelib.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app-map-httplib1.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">The Application</h1></div></div></div>
+  <p>The application is of course also based on Outcome, and like the HTTP library
+is also of mixed-failure design in that failure can be returned via error code,
+type erased <code>exception_ptr</code> or indeed a C++ exception throw.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// This is the namespace of the application which is connecting together the httplib,
+</span><span class="c1">// filelib and tidylib libraries into a solution.
+</span><span class="c1"></span><span class="k">namespace</span> <span class="n">app</span>
+<span class="p">{</span>
+  <span class="c1">// Create an ADL bridge so copy/move hooks will be searched for in this namespace
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="nl">error_code</span> <span class="p">:</span> <span class="k">public</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span>
+  <span class="p">{</span>
+    <span class="c1">// passthrough
+</span><span class="c1"></span>    <span class="k">using</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span><span class="o">::</span><span class="n">error_code</span><span class="p">;</span>
+    <span class="n">error_code</span><span class="p">()</span> <span class="o">=</span> <span class="k">default</span><span class="p">;</span>
+    <span class="n">error_code</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">)</span>
+        <span class="o">:</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span><span class="p">(</span><span class="n">ec</span><span class="p">)</span>
+    <span class="p">{</span>
+    <span class="p">}</span>
+  <span class="p">};</span>
+  <span class="c1">// Localise an outcome implementation for this namespace
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span>
+  <span class="k">using</span> <span class="n">outcome</span> <span class="o">=</span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">error_code</span> <span class="cm">/*, std::exception_ptr */</span><span class="o">&gt;</span><span class="p">;</span>
+  <span class="k">using</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">success</span><span class="p">;</span>
+<span class="p">}</span>  <span class="c1">// namespace app
+</span><span class="c1"></span></code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/finale.cpp#L178" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Here we localise a passthrough <code>error_code</code> solely for the purpose of ADL bridging, otherwise
+the localised <code>outcome</code> configured is the default one which comes with Outcome.
+<a href="../../../tutorial/advanced/hooks/adl_bridging.html">We covered this technique of &ldquo;passthrough <code>error_code</code>&rdquo; earlier in this tutorial</a>.</p>
+
+<p>The way we are going to configure interop is as follows:</p>
+
+<ol>
+<li>The application shall use <code>error_code</code> for anticipated failure and C++
+exception throws for unanticipated failure.</li>
+<li>We shall choose the convention that <code>app::outcome</code> with exception ptr
+solely and exclusively represents a type erased failure from a third party
+library.</li>
+</ol>
+
+<p>Thus if one calls <code>.value()</code> on an <code>app::outcome</code>, both anticipated failure
+within the app and type erased failure from a third party library shall be
+converted to a C++ exception throw.</p>
+
+
+        </div><p><small>Last revised: February 11, 2019 at 17:14:51 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/filelib.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app-map-httplib1.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop/conclusion.html b/doc/html/tutorial/advanced/interop/conclusion.html
new file mode 100644
index 000000000..53463a4a0
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/conclusion.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Conclusion - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app-go.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../recipes.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Conclusion</h1></div></div></div>
+  <p>This worked example was in fact excessively complex: a quicker route
+to achieving the same thing would be to add explicit converting constructors
+to <code>app::error_code</code> for each of the third party library <code>E</code> types.
+One then could have saved oneself with having to bother injecting
+custom converters into the <code>BOOST_OUTCOME_V2_NAMESPACE::convert</code> namespace.
+If you control your application&rsquo;s <code>E</code> type, then that is probably a
+better, and certainly simpler, approach.</p>
+
+<p>However there are occasions when you don&rsquo;t have control over the
+implementation of the destination <code>E</code> type e.g. in callbacks. Outcome&rsquo;s <code>value_or_error</code>
+infrastructure lets you inject custom interop code for any pair
+of incommensurate third party <code>E</code> types, without needing to modify either&rsquo;s
+source code.</p>
+
+<p>This is without doubt a &ldquo;power users&rdquo; feature, but
+one which will prove useful as <code>T|E</code> based C++ code proliferates.</p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/app-go.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../recipes.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop/filelib.html b/doc/html/tutorial/advanced/interop/filelib.html
new file mode 100644
index 000000000..be88dd259
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/filelib.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>The File I/O library - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/tidylib.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">The File I/O library</h1></div></div></div>
+  <p>The File I/O library we shall be using is very similar <a href="../../payload/copy_file2">to the one we saw earlier
+in this tutorial</a>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// You may remember this from the tutorial section on Custom Payloads
+</span><span class="c1"></span><span class="k">namespace</span> <span class="n">filelib</span>
+<span class="p">{</span>
+  <span class="c1">// Error code + paths related to a failure. Also causes ADL discovery
+</span><span class="c1"></span>  <span class="c1">// to check this namespace.
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="n">failure_info</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
+    <span class="n">path</span> <span class="n">path1</span><span class="p">{},</span> <span class="n">path2</span><span class="p">{};</span>
+  <span class="p">};</span>
+
+  <span class="c1">// Tell Outcome that failure_info is to be treated as a std::error_code
+</span><span class="c1"></span>  <span class="kr">inline</span> <span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span> <span class="o">&amp;</span><span class="n">make_error_code</span><span class="p">(</span><span class="k">const</span> <span class="n">failure_info</span> <span class="o">&amp;</span><span class="n">fi</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">;</span> <span class="p">}</span>
+
+  <span class="c1">// Tell Outcome that no-value observation should throw a custom exception
+</span><span class="c1"></span>  <span class="kr">inline</span> <span class="kt">void</span> <span class="n">outcome_throw_as_system_error_with_payload</span><span class="p">(</span><span class="n">failure_info</span> <span class="n">fi</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="c1">// If the error code is not filesystem related e.g. ENOMEM, throw that
+</span><span class="c1"></span>    <span class="c1">// as a standard STL exception.
+</span><span class="c1"></span>    <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">try_throw_std_exception_from_error</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">);</span>
+    <span class="c1">// Throw the exact same filesystem_error exception which the throwing
+</span><span class="c1"></span>    <span class="c1">// copy_file() edition does.
+</span><span class="c1"></span>    <span class="k">throw</span> <span class="nf">filesystem_error</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">(),</span> <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">path1</span><span class="p">),</span> <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">path2</span><span class="p">),</span> <span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">);</span>
+  <span class="p">}</span>
+
+  <span class="c1">// Localise a result implementation specific to this namespace.
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span> <span class="k">using</span> <span class="n">result</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">failure_info</span><span class="o">&gt;</span><span class="p">;</span>
+
+  <span class="c1">// Writes a chunk of data to some file. Returns bytes written, or
+</span><span class="c1"></span>  <span class="c1">// failure_info. Never throws exceptions.
+</span><span class="c1"></span>  <span class="n">result</span><span class="o">&lt;</span><span class="n">size_t</span><span class="o">&gt;</span> <span class="n">write_file</span><span class="p">(</span><span class="n">string_view</span> <span class="n">chunk</span><span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span>
+<span class="p">}</span>  <span class="c1">// namespace filelib
+</span><span class="c1"></span></code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/finale.cpp#L110" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>This uses the advanced Outcome feature of programming the lazy synthesis of
+custom C++ exception throws from a payload carrying <code>E</code> type called <code>failure_info</code>.
+Like the HTTP library, it too template aliases a localised <code>result</code> implementation
+into its namespace with ADL bridging so Outcome customisation points can be
+discovered.</p>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/tidylib.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/app.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop/httplib.html b/doc/html/tutorial/advanced/interop/httplib.html
new file mode 100644
index 000000000..65a4c7c88
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/httplib.html
@@ -0,0 +1,73 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>The HTTP library - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/value-or-error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/tidylib.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">The HTTP library</h1></div></div></div>
+  <p>Let us imagine a simple application: it fetches a HTTP page using a HTTP library,
+sends it through HTML tidy via the htmltidy library, and then writes it to disc
+using a filelib library. So three third party libraries, two using Outcome in
+incompatible ways, and the third being a C library just for kicks.</p>
+
+<p>Let us imagine that the HTTP library has the following public interface:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// This is some standalone library implementing high level HTTP
+</span><span class="c1"></span><span class="k">namespace</span> <span class="n">httplib</span>
+<span class="p">{</span>
+  <span class="c1">// These are the error code that this HTTP library can return
+</span><span class="c1"></span>  <span class="k">enum</span> <span class="k">class</span><span class="err"> </span><span class="nc">status_code</span>
+  <span class="p">{</span>
+    <span class="n">success</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span>  <span class="c1">// not the HTTP success code of 200
+</span><span class="c1"></span>
+    <span class="c1">// A subset of all HTTP status codes for brevity
+</span><span class="c1"></span>    <span class="n">bad_request</span> <span class="o">=</span> <span class="mi">400</span><span class="p">,</span>
+    <span class="n">access_denied</span> <span class="o">=</span> <span class="mi">401</span><span class="p">,</span>
+    <span class="n">logon_failed</span> <span class="o">=</span> <span class="mi">402</span><span class="p">,</span>
+    <span class="n">forbidden</span> <span class="o">=</span> <span class="mi">403</span><span class="p">,</span>
+    <span class="n">not_found</span> <span class="o">=</span> <span class="mi">404</span><span class="p">,</span>
+    <span class="n">internal_error</span> <span class="o">=</span> <span class="mi">500</span>
+  <span class="p">};</span>
+  <span class="c1">// This is the error type that this HTTP library can return
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="n">failure</span>
+  <span class="p">{</span>
+    <span class="n">status_code</span> <span class="n">status</span><span class="p">{</span><span class="n">status_code</span><span class="o">::</span><span class="n">success</span><span class="p">};</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">url</span><span class="p">{};</span>  <span class="c1">// The failing URL
+</span><span class="c1"></span>  <span class="p">};</span>
+  <span class="c1">// Localise a result implementation to this library, holding
+</span><span class="c1"></span>  <span class="c1">// the logic error of incorrect observation to mean program
+</span><span class="c1"></span>  <span class="c1">// termination.
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span>
+  <span class="k">using</span> <span class="n">result</span> <span class="o">=</span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">failure</span><span class="p">,</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">policy</span><span class="o">::</span><span class="n">terminate</span><span class="o">&gt;</span><span class="p">;</span>
+
+  <span class="cm">/* Performs a HTTP GET on the url, returning the body if successful,
+</span><span class="cm">  a failure with status_code if unsuccessful at the HTTP level, or a
+</span><span class="cm">  C++ exception throw if something catastrophic happened e.g. bad_alloc
+</span><span class="cm">  */</span>
+  <span class="n">result</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&gt;</span> <span class="n">get</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">url</span><span class="p">);</span>
+<span class="p">}</span>  <span class="c1">// namespace httplib
+</span><span class="c1"></span></code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/finale.cpp#L47" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The HTTP library is a mixed-failure design. Likely failures (HTTP status codes)
+are returned via <code>httplib::failure</code>, unlikely failures (e.g. out of memory)
+are returned via throw of the usual STL exception types.</p>
+
+<p>The sole API we bother describing is an implementation of HTTP GET. It fetches
+a URL, and either returns the contents or the failure reason why not.</p>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/value-or-error.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/tidylib.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop/problem.html b/doc/html/tutorial/advanced/interop/problem.html
new file mode 100644
index 000000000..11c709274
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/problem.html
@@ -0,0 +1,82 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Incommensurate E types - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/value-or-error.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Incommensurate E types</h1></div></div></div>
+  <p>Back in the essential tutorial section on <code>result</code>, we studied a likely very common
+initial choice of <code>E</code> type: <a href="../../../tutorial/essential/result.html">a strongly typed enum</a>.
+We saw how <a href="../../../motivation/plug_error_code.html">by marking up strongly typed enums to tell the C++ standard library
+what they are</a>, they gain implicit convertibility into <code>std::error_code</code>, and we
+then pointed out that you might as well now always set <code>E = std::error_code</code>, as that
+comes with the enormous advantage that you can use the boilerplate saving
+<code>BOOST_OUTCOME_TRY</code> macro when the <code>E</code> type is always the same.</p>
+
+<p>We thus strongly recommend to users that for any given piece of code, always
+using the same <code>E</code> type across the codebase is very wise, except where you explicitly want
+to prevent implicit propagation of failure up a call stack e.g. local failures in
+some domain specific piece of code.</p>
+
+<p>However it is unreasonable to expect that any non-trivial codebase can make do
+with <code>E = std::error_code</code>. This is why Outcome allows you to use <a href="../../payload">custom <code>E</code>
+types which carry payload</a> in addition to an error code, yet
+still have that custom type treated as if a <code>std::error_code</code>, including <a href="../../payload/copy_file3">lazy custom exception
+throw synthesis</a>.</p>
+
+<p>All this is good, but if library A uses <code>result&lt;T, libraryA::failure_info&gt;</code>,
+and library B uses <code>result&lt;T, libraryB::error_info&gt;</code> and so on, there becomes
+a problem for the application writer who is bringing in these third party
+dependencies and tying them together into an application. As a general rule,
+each third party library author will not have built in explicit interoperation
+support for unknown other third party libraries. The problem therefore lands
+with the application writer.</p>
+
+<p>The application writer has one of three choices:</p>
+
+<ol>
+<li><p>In the application, the form of result used is <code>result&lt;T, std::variant&lt;E1, E2, ...&gt;&gt;</code>
+where <code>E1</code>, <code>E2</code> &hellip; are the failure types for every third party library
+in use in the application. This has the advantage of preserving the original
+information exactly, but comes with a certain amount of use inconvenience
+and maybe excessive coupling between high level layers and implementation detail.</p></li>
+
+<li><p>One can translate/map the third party&rsquo;s failure type into the application&rsquo;s
+failure type at the point of the failure
+exiting the third party library and entering the application. One might do
+this, say, with a C preprocessor macro wrapping every invocation of the third
+party API from the application. This approach may lose the original failure detail,
+or mis-map under certain circumstances if the mapping between the two systems
+is not one-one.</p></li>
+
+<li><p>One can type erase the third party&rsquo;s failure type into some application
+failure type, which can later be reconstituted if necessary. This is the cleanest
+solution with the least coupling issues and no problems with mis-mapping, but
+it almost certainly requires the use of <code>malloc</code>, which the previous two did not.</p></li>
+</ol>
+
+<p>Things get even more complicated in the presence of callbacks. If in the
+callback you supply to library A, you call library B, you may need to insert
+switch statement maps or other mechanisms to convert library B&rsquo;s failures into
+something library A can understand, and then somehow extract that out &ndash; preferably
+without loss of original information &ndash; into the application&rsquo;s failure handling
+mechanism if library A subsequently returns failure as well. This implies
+transmitting state by which to track these interrelated pieces of failure data.</p>
+
+<p>Let us see what Outcome can do to help the application writer address some of these
+issues, next.</p>
+
+
+        </div><p><small>Last revised: February 09, 2019 at 15:18:26 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/value-or-error.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop/tidylib.html b/doc/html/tutorial/advanced/interop/tidylib.html
new file mode 100644
index 000000000..a2ded6ef1
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/tidylib.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>The HTMLTidy library - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/httplib.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/filelib.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">The HTMLTidy library</h1></div></div></div>
+  <div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// There actually is a library for tidying HTML into XHTML called HTMLTidy
+</span><span class="c1">// See http://www.html-tidy.org/
+</span><span class="c1">// HTMLTidy is actually a great tool for dealing with 1990s-era tag soup
+</span><span class="c1">// HTML, I highly recommend it.
+</span><span class="c1"></span>
+<span class="c1">// This isn&#39;t the API for Tidy, but let&#39;s assume it&#39;s a C library returning
+</span><span class="c1">// errno domained error codes. out must be freed with free() after use.
+</span><span class="c1"></span><span class="k">extern</span> <span class="s">&#34;C&#34;</span> <span class="kt">int</span> <span class="n">tidy_html</span><span class="p">(</span><span class="kt">char</span> <span class="o">**</span><span class="n">out</span><span class="p">,</span> <span class="n">size_t</span> <span class="o">*</span><span class="n">outlen</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">in</span><span class="p">,</span> <span class="n">size_t</span> <span class="n">inlen</span><span class="p">);</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/finale.cpp#L154" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>A C API may not initially appear to be a <code>T|E</code> based API, but if failure
+returns some domained error code and causes no other effects, and success
+returns some value, then it is effectively a &ldquo;split&rdquo; <code>T|E</code> API. The above
+is an example of exactly that form of &ldquo;split&rdquo; <code>T|E</code> API.</p>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/httplib.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/filelib.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/interop/value-or-error.html b/doc/html/tutorial/advanced/interop/value-or-error.html
new file mode 100644
index 000000000..4643dc061
--- /dev/null
+++ b/doc/html/tutorial/advanced/interop/value-or-error.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>value_or_error Concept - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/problem.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/httplib.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">value_or_error Concept</h1></div></div></div>
+  
+
+<p>Something not really mentioned until now is how Outcome interoperates with the proposed
+
+<a href="https://wg21.link/P0323" class="api-reference" target="_blank"><i class="fa fa-book" aria-hidden="true"></i> P0323 <code>std::expected&lt;T, E&gt;</code></a>
+, whose design lands in between <a href="../../../reference/aliases/unchecked.html" class="api-reference"><code>unchecked&lt;T, E = varies&gt;</code></a>
+
+and <a href="../../../reference/aliases/checked.html" class="api-reference"><code>checked&lt;T, E = varies&gt;</code></a>
+ (both of which are type aliases hard coding no-value
+policies <a href="../../../tutorial/essential/no-value/builtin.html">as previously covered in this tutorial</a>).</p>
+
+<p>Expected and Outcome are <a href="../../../faq.html#why-doesn-t-outcome-duplicate-std-expected-t-e-s-design">isomorphic to one another in design intent</a>, but interoperation
+for code using Expected and Outcome ought to be seamless thanks to the <a href="https://wg21.link/P0786">proposed <code>ValueOrError</code>
+concept framework</a>, a subset of which Outcome implements.</p>
+
+<p>The <a href="../../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" class="api-reference"><code>explicit basic_result(concepts::value_or_error&lt;T, E&gt; &amp;&amp;)</code></a>
+ and <a href="../../../reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html" class="api-reference"><code>explicit basic_outcome(concepts::value_or_error&lt;T, E&gt; &amp;&amp;)</code></a>
+
+constructors will explicitly construct from any type matching the <a href="../../../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" class="api-reference"><code>concepts::value_or_error&lt;T, E&gt;</code></a>
+
+concept, which includes <code>std::expected&lt;A, B&gt;</code>, if <code>A</code> is constructible to <code>X</code>, and <code>B</code> is
+constructible to <code>Y</code>. The <code>value_or_error</code> concept in turn is true if and only if the input type has:</p>
+
+<ol>
+<li>A <code>.has_value()</code> observer returning a <code>bool</code>.</li>
+<li><code>.value()</code> and <code>.error()</code> observers.</li>
+</ol>
+
+<h2 id="implementation">Implementation</h2>
+
+<p>Outcome&rsquo;s machinery for implementing <code>concepts::value_or_error</code> conversion is user extensible by injection
+of specialisations of the <a href="../../../reference/converters/value_or_error.html" class="api-reference"><code>value_or_error&lt;T, U&gt;</code></a>
+ type into the <code>BOOST_OUTCOME_V2_NAMESPACE::convert</code> namespace.</p>
+
+<p>Outcome&rsquo;s default <code>convert::value_or_error&lt;T, U&gt;</code> implementation explicitly
+excludes Outcome <code>result</code> and <code>outcome</code> types from the default mechanism as
+there is a major gotcha: the <code>value_or_error</code> matched type&rsquo;s <code>.value()</code> is often
+not callable in constexpr as it can throw, which makes this conversion mechanism
+pretty much useless for constexpr code. Besides, <code>outcome</code> has a converting
+constructor overload for <code>result</code> inputs which is constexpr capable.</p>
+
+<p>Note that if you do enable <code>outcome</code> inputs, a <code>result</code> will match an input
+<code>outcome</code>, but silently dropping any exception state. This is probably undesirable.</p>
+
+<p>Examples of how to implement your own <code>convert::value_or_error&lt;T, U&gt;</code> converter
+is demonstrated in the worked example, next.</p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/interop/problem.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/interop/httplib.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/payload.html b/doc/html/tutorial/advanced/payload.html
new file mode 100644
index 000000000..83368e0ef
--- /dev/null
+++ b/doc/html/tutorial/advanced/payload.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Custom payloads - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/advanced.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/advanced.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/advanced/payload/copy_file.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Custom payloads</h1></div></div></div>
+<p>So far in this tutorial, type <code>EC</code> in <code>result&lt;T, EC&gt;</code> has always been a
+<code>std::error_code</code> or <code>boost::system::error_code</code>. With <code>NoValuePolicy</code>
+set to <a href="../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy&lt;T, EC, EP&gt;</code></a>
+, <code>EC</code> needs
+in fact to merely satisfy the trait
+<a href="../../reference/traits/is_error_code_available.html" class="api-reference"><code>is_error_code_available&lt;T&gt;</code></a>
+
+for <code>EC</code> to be treated as if an <code>error_code</code>. Outcome specialises that
+trait for <code>std::error_code</code> and <code>boost::system::error_code</code>,
+hence they &ldquo;just work&rdquo;.</p>
+
+<p>If no specialisation exists, <code>trait::is_error_code_available&lt;EC&gt;</code> is true
+if there exists some ADL discovered free function <code>make_error_code(EC)</code>.</p>
+
+<p>Thus, we can in fact use any custom <code>EC</code> type we like, including one carrying additional
+information, or <em>payload</em>. This payload can carry anything you like, and you can tell
+Outcome to do various things with that payload under various circumstances. For example:</p>
+
+<ol>
+<li>If the user tries to observe an unsuccessful <code>result</code>, throw a custom exception
+containing the cause of failure with accompanying context from the payload.</li>
+<li>If the user ever constructs an <code>outcome</code> from a payload carrying <code>result</code>,
+set the exception ptr in the constructed <code>outcome</code> to a custom exception
+containing the cause of the failure with accompanying context from the payload.</li>
+<li>Transmit a stack backtrace specifying the exact point at which failure occurred,
+symbolising that backtrace into human readable text at the moment of conversion into human
+readable text.</li>
+<li>Upon a namespace-localised <code>result</code> from library A being copy/moved into a
+namespace-localised <code>result</code> from C bindings library B, set the C <code>errno</code> if
+the error code and category map onto the <code>errno</code> domain.</li>
+</ol>
+
+<p>There are many, many other options of course. This tutorial can only cover a
+reasonable subset. This section covers Example 1 above, throwing custom exceptions
+with payload upon observation of an unsuccessful <code>result</code>.</p>
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/advanced.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/advanced.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/advanced/payload/copy_file.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/payload/copy_file.html b/doc/html/tutorial/advanced/payload/copy_file.html
new file mode 100644
index 000000000..f7e07c005
--- /dev/null
+++ b/doc/html/tutorial/advanced/payload/copy_file.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>The Filesystem TS - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/payload.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/payload.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/payload/copy_file2.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">The Filesystem TS</h1></div></div></div>
+  <p>Something which has long annoyed the purists in the C++ leadership is the problem of dual
+overloads in <code>error_code</code> capable standard library APIs.</p>
+
+<p>Consider the
+<a href="http://en.cppreference.com/w/cpp/filesystem/copy_file"><code>copy_file()</code></a>
+API from the Filesystem TS:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">filesystem</span>
+<span class="p">{</span>
+  <span class="cm">/*! Copies the file at path `from` to path `to`.
+</span><span class="cm">  \returns True if file was successfully copied.
+</span><span class="cm">  \throws On failure throws `filesystem_error(ec.message(), from, to, ec)` with
+</span><span class="cm">  `ec` being the error code reported by the operating system.
+</span><span class="cm">  */</span>
+  <span class="kt">bool</span> <span class="n">copy_file</span><span class="p">(</span><span class="k">const</span> <span class="n">path</span> <span class="o">&amp;</span><span class="n">from</span><span class="p">,</span> <span class="k">const</span> <span class="n">path</span> <span class="o">&amp;</span><span class="n">to</span><span class="p">);</span>
+
+  <span class="cm">/*! Copies the file at path `from` to path `to`.
+</span><span class="cm">  \returns True if file was successfully copied. If false, `ec` is written with
+</span><span class="cm">  the error code reported by the operating system.
+</span><span class="cm">  \throws May throw an exception if there is some &#34;catastrophic&#34; failure
+</span><span class="cm">  e.g. failure to allocate memory.
+</span><span class="cm">  */</span>
+  <span class="kt">bool</span> <span class="nf">copy_file</span><span class="p">(</span><span class="k">const</span> <span class="n">path</span> <span class="o">&amp;</span><span class="n">from</span><span class="p">,</span> <span class="k">const</span> <span class="n">path</span> <span class="o">&amp;</span><span class="n">to</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span> <span class="o">&amp;</span><span class="n">ec</span><span class="p">);</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/outcome_payload.cpp#L56" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Before Outcome, the common design pattern was to provide throwing and non-throwing overloads
+of every API. As you can see above, the throwing API throws a <a href="http://en.cppreference.com/w/cpp/filesystem/filesystem_error"><code>filesystem::filesystem_error</code></a>
+exception type which carries additional information, specifically two paths. These paths may
+refer to the files which were the source of any failure. However the non-throwing overload
+does <strong>not</strong> provide this additional information, which can make it more annoying to use the
+non-throwing overload sometimes.</p>
+
+<p>What if we could replace these two overloads of every API in the Filesystem TS with a single API,
+and additionally have the non-throwing edition return the exact same additional information
+as the throwing edition?</p>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/payload.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/payload.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/payload/copy_file2.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/payload/copy_file2.html b/doc/html/tutorial/advanced/payload/copy_file2.html
new file mode 100644
index 000000000..6af4df6f5
--- /dev/null
+++ b/doc/html/tutorial/advanced/payload/copy_file2.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Upgrading the Filesystem TS - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/payload/copy_file.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/payload.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/payload/copy_file3.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Upgrading the Filesystem TS</h1></div></div></div>
+  <p>An Outcome based solution to the dual overload problem is straightforward:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">filesystem2</span>
+<span class="p">{</span>
+  <span class="c1">// Error code + paths related to a failure. Also causes ADL discovery to check this namespace.
+</span><span class="c1"></span>  <span class="k">struct</span> <span class="n">failure_info</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
+    <span class="n">path</span> <span class="n">path1</span><span class="p">,</span> <span class="n">path2</span><span class="p">;</span>
+  <span class="p">};</span>
+
+  <span class="c1">// Tell Outcome that failure_info is to be treated as a std::error_code
+</span><span class="c1"></span>  <span class="kr">inline</span> <span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span> <span class="o">&amp;</span><span class="n">make_error_code</span><span class="p">(</span><span class="k">const</span> <span class="n">failure_info</span> <span class="o">&amp;</span><span class="n">fi</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">;</span> <span class="p">}</span>
+
+  <span class="c1">// Localise an outcome implementation specific to this namespace. Normally would just
+</span><span class="c1"></span>  <span class="c1">// be `result`, but for clarity we&#39;ll use `fs_result`.
+</span><span class="c1"></span>  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span> <span class="k">using</span> <span class="n">fs_result</span> <span class="o">=</span> <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">failure_info</span><span class="o">&gt;</span><span class="p">;</span>
+
+  <span class="cm">/*! Copies the file at path `from` to path `to`.
+</span><span class="cm">  \returns Successful if file was successfully copied, otherwise the error code reported
+</span><span class="cm">  by the operating system plus a payload of the paths involved.
+</span><span class="cm">  \throws Never throws.
+</span><span class="cm">  */</span>
+  <span class="n">fs_result</span><span class="o">&lt;</span><span class="kt">void</span><span class="o">&gt;</span> <span class="n">copy_file</span><span class="p">(</span><span class="k">const</span> <span class="n">path</span> <span class="o">&amp;</span><span class="n">from</span><span class="p">,</span> <span class="k">const</span> <span class="n">path</span> <span class="o">&amp;</span><span class="n">to</span><span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/outcome_payload.cpp#L76" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Starting at the bottom, there is now a single <code>copy_file()</code> function which returns a <code>fs_result&lt;void&gt;</code>.
+As <code>result</code> is either successful or not, there is no longer any point in returning a boolean, so we
+simply return <code>void</code> on success. On failure, as the template alias <code>fs_result&lt;T&gt;</code> above it shows,
+we are returning a <code>failure_info</code> structure containing an error code and the same additional information
+as <code>filesystem_error</code> provides.</p>
+
+<p>It is important to note that the fact that <code>failure_info</code> is defined in namespace <code>filesystem2</code> is very
+important. This is because Outcome uses <a href="http://en.cppreference.com/w/cpp/language/adl">Argument Dependent Lookup (ADL)</a>
+to find the <code>make_error_code()</code>
+function, as well as other customisation point free functions. In other words, only the namespaces as
+defined by ADL are searched when finding a free function telling us what to do for <code>failure_info</code>,
+which includes the namespace <code>failure_info</code> is declared into.</p>
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/payload/copy_file.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/payload.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/payload/copy_file3.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/advanced/payload/copy_file3.html b/doc/html/tutorial/advanced/payload/copy_file3.html
new file mode 100644
index 000000000..cbb1a7382
--- /dev/null
+++ b/doc/html/tutorial/advanced/payload/copy_file3.html
@@ -0,0 +1,100 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Auto-throwing filesystem_error - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/payload/copy_file2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/payload.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Auto-throwing filesystem_error</h1></div></div></div>
+  <p>Something not mentioned at all until now (and properly described in the next
+section, <a href="../../default-actions/">Default actions</a>) is that Outcome can be
+programmed take various actions when the user tries to observe <code>.value()</code>
+when there is no value, and so on for the other possible state observations.</p>
+
+<p>Seeing as we are replacing the throwing overload of <code>copy_file()</code> in the
+Filesystem TS with a <code>result</code> returning edition instead, it would make
+sense if an attempt to observe the value of an unsuccessful <code>fs_result</code>
+threw the exact same <code>filesystem_error</code> as the Filesystem TS does.</p>
+
+<p>Telling Outcome how to throw a <code>filesystem_error</code> with payload of the
+failing paths is easy:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">filesystem2</span>
+<span class="p">{</span>
+  <span class="c1">// If we would like Outcome to do something other than the default action (see next
+</span><span class="c1"></span>  <span class="c1">// section), we can declare this ADL discovered free function to customise what
+</span><span class="c1"></span>  <span class="c1">// to do instead.
+</span><span class="c1"></span>  <span class="c1">//
+</span><span class="c1"></span>  <span class="c1">// Note that rvalue semantics are propagated internally by Outcome, so if the user
+</span><span class="c1"></span>  <span class="c1">// called .value() on a rvalued result, failure_info will be moved rather than
+</span><span class="c1"></span>  <span class="c1">// copied from the result. That means we can overload once with value semantics,
+</span><span class="c1"></span>  <span class="c1">// and not need to overload for lvalue and rvalue situations unless we really feel
+</span><span class="c1"></span>  <span class="c1">// we need to for some reason.
+</span><span class="c1"></span>  <span class="kr">inline</span> <span class="kt">void</span> <span class="n">outcome_throw_as_system_error_with_payload</span><span class="p">(</span><span class="n">failure_info</span> <span class="n">fi</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="c1">// If the error code is not filesystem related e.g. ENOMEM, throw that as a
+</span><span class="c1"></span>    <span class="c1">// standard STL exception.
+</span><span class="c1"></span>    <span class="n">outcome</span><span class="o">::</span><span class="n">try_throw_std_exception_from_error</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">);</span>
+    <span class="c1">// Throw the exact same filesystem_error exception which the throwing copy_file()
+</span><span class="c1"></span>    <span class="c1">// edition does.
+</span><span class="c1"></span>    <span class="k">throw</span> <span class="nf">filesystem_error</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">(),</span> <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">path1</span><span class="p">),</span>  <span class="c1">//
+</span><span class="c1"></span>                           <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">fi</span><span class="p">.</span><span class="n">path2</span><span class="p">),</span> <span class="n">fi</span><span class="p">.</span><span class="n">ec</span><span class="p">);</span>
+  <span class="p">}</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/outcome_payload.cpp#L107" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Reference documentation for the above functions:</p>
+
+<ul>
+<li><a href="../../../reference/functions/policy.html">List of builtin <code>outcome_throw_as_system_error_with_payload()</code> overloads</a></li>
+<li><a href="../../../reference/functions/try_throw_std_exception_from_error.html" class="api-reference"><code>void try_throw_std_exception_from_error(std::error_code ec, const std::string &amp;msg = std::string{})</code></a>
+</li>
+</ul>
+
+<p>Usage of our new &ldquo;upgraded&rdquo; Filesystem <code>copy_file()</code> might now be as follows:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++">  <span class="c1">// Non-throwing use case
+</span><span class="c1"></span>  <span class="k">auto</span> <span class="n">o</span> <span class="o">=</span> <span class="n">filesystem2</span><span class="o">::</span><span class="n">copy_file</span><span class="p">(</span><span class="s">&#34;dontexist&#34;</span><span class="p">,</span> <span class="s">&#34;alsodontexist&#34;</span><span class="p">);</span>
+  <span class="k">if</span><span class="p">(</span><span class="o">!</span><span class="n">o</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Copy file failed with error &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">o</span><span class="p">.</span><span class="n">error</span><span class="p">().</span><span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">()</span>                   <span class="c1">//
+</span><span class="c1"></span>              <span class="o">&lt;&lt;</span> <span class="s">&#34; (path1 = &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">o</span><span class="p">.</span><span class="n">error</span><span class="p">().</span><span class="n">path1</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;, path2 = &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">o</span><span class="p">.</span><span class="n">error</span><span class="p">().</span><span class="n">path2</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;)&#34;</span>  <span class="c1">//
+</span><span class="c1"></span>              <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="p">}</span>
+
+  <span class="c1">// Throwing use case
+</span><span class="c1"></span>  <span class="k">try</span>
+  <span class="p">{</span>
+    <span class="c1">// Try to observe the successful value, thus triggering default actions which invokes
+</span><span class="c1"></span>    <span class="c1">// our outcome_throw_as_system_error_with_payload() above which then throws filesystem_error
+</span><span class="c1"></span>    <span class="c1">// exactly like the Filesystem TS does for its throwing overload.
+</span><span class="c1"></span>    <span class="n">filesystem2</span><span class="o">::</span><span class="n">copy_file</span><span class="p">(</span><span class="s">&#34;dontexist&#34;</span><span class="p">,</span> <span class="s">&#34;alsodontexist&#34;</span><span class="p">).</span><span class="n">value</span><span class="p">();</span>
+  <span class="p">}</span>
+  <span class="k">catch</span><span class="p">(</span><span class="k">const</span> <span class="n">filesystem2</span><span class="o">::</span><span class="n">filesystem_error</span> <span class="o">&amp;</span><span class="n">e</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Copy file failed with exception &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">e</span><span class="p">.</span><span class="n">what</span><span class="p">()</span>                 <span class="c1">//
+</span><span class="c1"></span>              <span class="o">&lt;&lt;</span> <span class="s">&#34; (path1 = &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">e</span><span class="p">.</span><span class="n">path1</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;, path2 = &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">e</span><span class="p">.</span><span class="n">path2</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;)&#34;</span>  <span class="c1">//
+</span><span class="c1"></span>              <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="p">}</span>
+  <span class="k">catch</span><span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">exception</span> <span class="o">&amp;</span><span class="n">e</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&#34;Copy file failed with exception &#34;</span> <span class="o">&lt;&lt;</span> <span class="n">e</span><span class="p">.</span><span class="n">what</span><span class="p">()</span>  <span class="c1">//
+</span><span class="c1"></span>              <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+  <span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/outcome_payload.cpp#L134" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/advanced/payload/copy_file2.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/advanced/payload.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/advanced/constructors.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential.html b/doc/html/tutorial/essential.html
new file mode 100644
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+++ b/doc/html/tutorial/essential.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Essential - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../tutorial.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../tutorial.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../tutorial/essential/before.html"><img src="../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Essential</h1></div></div></div>
+<ol class="children children-li"><li>
+	<a href="../tutorial/essential/before.html" >Before we begin</a>
+<p>Essential information before you begin the tutorial.</p><li>
+	<a href="../tutorial/essential/result.html" >result&lt;&gt;</a>
+<p>Gentle introduction to writing code with simple success-or-failure return types.</p><ol><li>
+	<a href="../tutorial/essential/result/inspecting.html" >Inspecting result<T, EC></a><li>
+	<a href="../tutorial/essential/result/try.html" >TRY operations</a><li>
+	<a href="../tutorial/essential/result/try_greedy.html" >TRY is greedy</a><li>
+	<a href="../tutorial/essential/result/try_ref.html" >TRY avoiding copy/move</a></li></ol><li>
+	<a href="../tutorial/essential/outcome.html" >outcome&lt;&gt;</a>
+<p>Success-or-failure return types where failure can take two forms, expected/handled failure and unexpected/abort failure.</p><ol><li>
+	<a href="../tutorial/essential/outcome/inspecting.html" >Inspecting outcome<T, EC, EP></a></li></ol><li>
+	<a href="../tutorial/essential/no-value.html" >No-value policies</a>
+<p>Describes the concept of NoValuePolicy and how to use no-value policies.</p><ol><li>
+	<a href="../tutorial/essential/no-value/custom.html" >A custom no-value policy</a><li>
+	<a href="../tutorial/essential/no-value/builtin.html" >Built-in policies</a></li></ol><li>
+	<a href="../tutorial/essential/coroutines.html" >Coroutines</a>
+<p>Using Outcome in C++ Coroutines</p><ol><li>
+	<a href="../tutorial/essential/coroutines/try.html" >Coroutine TRY operation</a><li>
+	<a href="../tutorial/essential/coroutines/awaitables.html" >Coroutine awaitables</a><li>
+	<a href="../tutorial/essential/coroutines/returning.html" >Returning Outcome types from Coroutines</a><li>
+	<a href="../tutorial/essential/coroutines/co_await.html" ><code>operator co_await</code> as TRY operator</a></li></ol><li>
+	<a href="../tutorial/essential/conventions.html" >Conventions</a>
+<p>Why you should avoid custom <code>E</code> types in public APIs.</p></li></ol>
+
+
+
+
+
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../tutorial.html"><img src="../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../tutorial.html"><img src="../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../tutorial/essential/before.html"><img src="../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/before.html b/doc/html/tutorial/essential/before.html
new file mode 100644
index 000000000..2d4f24d27
--- /dev/null
+++ b/doc/html/tutorial/essential/before.html
@@ -0,0 +1,92 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Before we begin - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/essential/result.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Before we begin</h1></div></div></div>
+  
+
+<h2 id="outcome-v2-namespace">Outcome v2 namespace</h2>
+
+<p>It is recommended that you refer to entities from this Outcome v2 via the following namespace alias:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">outcome</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_result.cpp#L38" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>On standalone Outcome only, as patches and modifications are applied to this library,
+namespaces get permuted in order to not to cause binary incompatibility. At some point
+namespace <code>outcome_v2</code> will be defined, and this will be the preferred namespace.
+Until then <code>BOOST_OUTCOME_V2_NAMESPACE</code> denotes the most recently
+updated version, getting closer to <code>outcome_v2</code>.</p>
+
+<p>On Boost.Outcome only, as Boost provides no binary compatibility across releases,
+<code>BOOST_OUTCOME_V2_NAMESPACE</code> always expands into <code>boost::outcome_v2</code>.</p>
+
+<h2 id="online-compilers">Online compilers</h2>
+
+<p>If you&rsquo;ve never used them before, you will find
+<a href="https://godbolt.org/">Godbolt</a> and <a href="https://wandbox.org/">Wandbox</a> invaluable.
+These let you play with C++ inside your web browser.</p>
+
+<p>Most of the source code snippets in Outcome have a link in their top right to
+the original source code on github. You can copy and paste this source code into
+Godbolt (if you wish to study the assembler generated) or Wandbox (if you
+wish to run the program).</p>
+
+<h3 id="godbolt">Godbolt</h3>
+
+<p>Godbolt is invaluable for visualising online the assembler generated for a
+piece of C++, for all the major compilers and CPU architectures.</p>
+
+<p>Standalone Outcome is built into Godbolt! In the right hand pane toolbar, click the
+libraries dropdown (currently third from the right, looks like a book), find
+Outcome and choose the version you want.</p>
+
+<p>After this is selected, you can <code>#include</code> any of these editions of Outcome:</p>
+
+<dl>
+  <dt><code>&lt;outcome-basic.hpp&gt;</code></dt>
+  <dd>An inclusion of <code>basic_outcome.hpp</code> + <code>try.hpp</code> which includes as few
+  system headers as possible in order to give an absolute minimum compile time
+  impact edition of Outcome. See <a href="https://github.com/ned14/stl-header-heft">https://github.com/ned14/stl-header-heft</a>.
+  </dd>
+  <dt><code>&lt;outcome-experimental.hpp&gt;</code></dt>
+  <dd>An inclusion of <code>experimental/status_outcome.hpp</code> + <code>try.hpp</code> which
+  is the low compile time impact of the basic edition combined with
+  <code>status_code</code> from <a href="https://ned14.github.io/status-code/">https://ned14.github.io/status-code/</a>. If you are on an
+  embedded system where binary bloat must be absolutely avoided, and don't
+  mind the potentially unstable <code>status_code</code>, this is definitely the edition
+  for you.
+  </dd>
+  <dt><code>&lt;outcome.hpp&gt;</code></dt>
+  <dd>An inclusion of <code>outcome.hpp</code> which brings in all the specialisations
+  for the <code>std</code> STL types, plus iostreams support. If you don't know which
+  edition to use, you should use this one, it ought to "just work".</dd>
+</dl>
+
+<p>Here is the first tutorial topic&rsquo;s source code loaded into Godbolt: <a href="https://godbolt.org/z/4of3c8">https://godbolt.org/z/4of3c8</a></p>
+
+<h3 id="wandbox">Wandbox</h3>
+
+<p>Wandbox lets you place a third party header into a separate tab. It also
+comes with a recent Boost libraries. Either technique can be used to
+explore Outcome.</p>
+
+<p>Here is the first tutorial topic&rsquo;s source code loaded into Wandbox: <a href="https://wandbox.org/permlink/sJoeKHXSyCU5Avft">https://wandbox.org/permlink/sJoeKHXSyCU5Avft</a></p>
+
+
+        </div><p><small>Last revised: December 15, 2020 at 12:22:39 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/essential/result.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/conventions.html b/doc/html/tutorial/essential/conventions.html
new file mode 100644
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@@ -0,0 +1,66 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Conventions - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential/coroutines/co_await.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/advanced.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Conventions</h1></div></div></div>
+
+
+<p>You now know everything you need to get started with using Outcome
+immediately.</p>
+
+<p>The initial temptation for most beginners will be to use a bespoke
+strongly typed enumeration on a case by case basis i.e. a &ldquo;once off&rdquo;
+custom <code>E</code> type. This is usually due to experience in other languages
+with sum types e.g. Rust, Haskell, Swift etc.</p>
+
+<p>However this is C++! Not Rust, not Swift, not Haskell! I must caution you to always avoid using
+custom <code>E</code> types in public APIs. The reason is that every time
+library A using custom <code>E1</code> type must interface with library B
+using custom <code>E2</code> type, you must map between those <code>E1</code> and <code>E2</code>
+types.</p>
+
+<p>This is information lossy, i.e. fidelity of failure gets lost
+after multiple translations. It involves writing, and then
+<em>maintaining</em>, a lot of annoying boilerplate. It leaks internal
+implementation detail, and fails to separate concerns. And one
+cannot use <a href="../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)/BOOST_OUTCOME_TRY(expr)</code></a>
+
+if there is no convertibility between <code>E</code> types.</p>
+
+<p>The C++ 11 standard library, and Boost,
+specifically ships <code>&lt;system_error&gt;</code> for the purpose of wrapping up
+individual custom <code>E</code> types into a generic framework, where disparate
+custom <code>E</code> types can discover and interact with one another.
+That ships with every C++ compiler.</p>
+
+<p>For all these reasons, this is why <code>result</code> and <code>outcome</code> default
+the <code>EC</code> type to error code. You should leave that default alone
+where possible.</p>
+
+<hr />
+
+<h3 id="tl-dr">tl;dr;</h3>
+
+<p>Please <a href="../../motivation/plug_error_code.html">plug your library into <code>std::error_code</code></a>,
+or <a href="../../experimental.html">equivalent</a>, and do not expose
+custom <code>E</code> types in ANY public API. <code>result</code> and <code>outcome</code> default
+<code>EC</code> to an error code for good reason.</p>
+
+
+
+        </div><p><small>Last revised: February 09, 2019 at 15:18:26 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential/coroutines/co_await.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/advanced.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/coroutines.html b/doc/html/tutorial/essential/coroutines.html
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+++ b/doc/html/tutorial/essential/coroutines.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Coroutines - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential/no-value/builtin.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/essential/coroutines/try.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Coroutines</h1></div></div></div>
+<p><a href="../../changelog.html">In v2.1.2</a> Outcome published official support for using
+Outcome within C++ coroutines. This page documents that support.</p>
+
+<p>All standard C++ Coroutines have the following form:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// Coroutine functions MUST return an AWAITABLE type
+</span><span class="c1"></span><span class="n">AWAITABLE</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">function_name</span><span class="p">(</span><span class="n">Args</span> <span class="p">...)</span>
+<span class="p">{</span>
+  <span class="p">...</span> <span class="n">ordinary</span> <span class="n">C</span><span class="o">++</span> <span class="p">...</span>
+  <span class="k">if</span><span class="p">(</span><span class="o">!</span><span class="p">...)</span>
+  <span class="p">{</span>
+    <span class="n">co_return</span> <span class="mi">5</span><span class="p">;</span>  <span class="c1">// CANNOT use ordinary &#39;return&#39; from coroutines
+</span><span class="c1"></span>  <span class="p">}</span>
+  <span class="p">...</span>
+  <span class="c1">// Possibly suspend this coroutine&#39;s execution until the
+</span><span class="c1"></span>  <span class="c1">// awaitable resumes execution of dependent code
+</span><span class="c1"></span>  <span class="k">auto</span> <span class="n">x</span> <span class="o">=</span> <span class="n">co_await</span> <span class="n">expr_resulting_in_AWAITABLE</span><span class="p">;</span>
+  <span class="p">...</span>
+<span class="p">}</span>
+</code></pre></div>
+<p>The type <code>AWAITABLE&lt;T&gt;</code> is any type which publishes the Coroutine protocol telling
+C++ how to suspend and resume execution of a coroutine which returns a <code>T</code>. It is out of scope of
+this page to document how to do this, however note that the <code>eager&lt;T, Executor = void&gt;</code> and <code>lazy&lt;T, Executor = void&gt;</code>
+types below are completely generic awaitables suitable for use in ANY code.
+They <strong>only</strong> behave differently if <code>T</code>, the type being returned by the awaitable,
+is an Outcome type e.g. <code>outcome::basic_result</code> or <code>outcome::basic_outcome</code>.</p>
+
+
+
+        </div><p><small>Last revised: March 18, 2022 at 14:45:32 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential/no-value/builtin.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/essential/coroutines/try.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/coroutines/awaitables.html b/doc/html/tutorial/essential/coroutines/awaitables.html
new file mode 100644
index 000000000..fb918014b
--- /dev/null
+++ b/doc/html/tutorial/essential/coroutines/awaitables.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Coroutine awaitables - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/coroutines/try.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/coroutines/returning.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Coroutine awaitables</h1></div></div></div>
+  <p>The second part of the support is provided by header <code>&lt;boost/outcome/coroutine_support.hpp&gt;</code>
+(or <code>&lt;boost/outcome/experimental/coroutine_support.hpp&gt;</code> if you want Coroutine support for
+Experimental Outcome). This adds into namespace <code>BOOST_OUTCOME_V2_NAMESPACE::awaitables</code> (or
+<code>BOOST_OUTCOME_V2_NAMESPACE::experimental::awaitables</code>) these awaitable types suitable
+for returning from a Coroutinised function:</p>
+
+<ul>
+<li><a href="../../../reference/types/awaitables/eager.html" class="api-reference"><code>eager&lt;T, Executor = void&gt;</code></a>
+
+
+<p>An eagerly evaluated Coroutine: invoking <code>co_await</code> upon a function returning one
+of these immediately begins the execution of the function now. If the function never
+suspends, the overhead is similar to calling an ordinary function.</p></li>
+
+<li><a href="../../../reference/types/awaitables/lazy.html" class="api-reference"><code>lazy&lt;T, Executor = void&gt;</code></a>
+
+
+<p>A lazily evaluated Coroutine (often named <code>task&lt;T&gt;</code> in most C++ Coroutine
+literature): invoking <code>co_await</code> upon a function returning one of these causes the
+function to be immediately suspended as soon as execution begins. Only resuming
+the execution of the coroutine proceeds execution.</p></li>
+
+<li><a href="../../../reference/types/awaitables/generator.html" class="api-reference"><code>generator&lt;T, Executor = void&gt;</code></a>
+
+
+<p>A lazily evaluated generator of values: the coroutine is resumed to generate
+the next value, upon which it is suspended until the next iteration.</p></li>
+
+<li><p><code>atomic_eager&lt;T, Executor = void&gt;</code></p>
+
+<p><code>eager&lt;T&gt;</code> does not employ thread synchronisation during resumption of dependent
+coroutines which is fine if you do not traverse kernel threads during a
+suspend-resume cycle. If you do however potentially traverse kernel threads
+during suspend-resume, you ought to use <code>atomic_eager&lt;T&gt;</code> instead &ndash; this uses
+atomics to synchronise the setting and checking of state to ensure correctness.</p></li>
+
+<li><p><code>atomic_lazy&lt;T, Executor = void&gt;</code></p>
+
+<p>Same for <code>lazy&lt;T&gt;</code> as <code>atomic_eager&lt;T&gt;</code> is for <code>eager&lt;T&gt;</code>.</p></li>
+</ul>
+
+
+        </div><p><small>Last revised: March 18, 2022 at 14:45:32 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/coroutines/try.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/coroutines/returning.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/coroutines/co_await.html b/doc/html/tutorial/essential/coroutines/co_await.html
new file mode 100644
index 000000000..c2896544a
--- /dev/null
+++ b/doc/html/tutorial/essential/coroutines/co_await.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>operator co_await as TRY operator - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/coroutines/returning.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/conventions.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both"><code>operator co_await</code> as TRY operator</h1></div></div></div>
+  <p>Many people have requested that <code>operator co_await</code> be overloaded to
+behave as a TRY operator when supplied with an Outcome type.</p>
+
+<p>Outcome does not implement that extension, nor will we accept PRs
+contributing support for this. We think you should use <code>BOOST_OUTCOME_CO_TRY()</code>
+as this will lead to more maintainable and future proof code.</p>
+
+<p>However, we deliberately do not get in the way of you implementing
+that overload yourself in your own Outcome-based code. Just be sure
+that you document what you are doing loudly and clearly, and be
+aware that future C++ standards may have a proper <code>operator try</code>
+overload mechanism.</p>
+
+
+        </div><p><small>Last revised: April 07, 2020 at 10:22:38 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/coroutines/returning.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/conventions.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/coroutines/returning.html b/doc/html/tutorial/essential/coroutines/returning.html
new file mode 100644
index 000000000..cfe5df238
--- /dev/null
+++ b/doc/html/tutorial/essential/coroutines/returning.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Returning Outcome types from Coroutines - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/coroutines/awaitables.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/coroutines/co_await.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Returning Outcome types from Coroutines</h1></div></div></div>
+  <p><code>eager&lt;T, Executor = void&gt;</code> and <code>lazy&lt;T, Executor = void&gt;</code> and their atomic editions are completely standard
+awaitables with no special behaviours, <strong>except</strong> if <code>T</code> is a <code>basic_result</code>
+or <code>basic_outcome</code>. In that situation, the following occurs:</p>
+
+<p>If the Coroutine throws a C++ exception which was not handled inside the Coroutine
+body, Outcome&rsquo;s awaitable types try to convert it into a form which your Result or
+Outcome type being returned can transport. For example:</p>
+
+<ul>
+<li><p>If your Coroutine were returning a <code>result&lt;T, std::exception_ptr&gt;</code>, an
+errored Result with a pointer to the exception thrown would be returned.</p></li>
+
+<li><p>If your Coroutine were returning a <code>result&lt;T, std::error_code&gt;</code>, the
+exception ptr is passed to <a href="../../../reference/functions/error_from_exception.html" class="api-reference"><code>error_from_exception(</code></a>
+<code>)</code> to see
+if it can be matched to an equivalent <code>std::error_code</code>. If it can, an
+errored Result with the equivalent error code would be returned.</p></li>
+
+<li><p>If your Coroutine were returning an <code>outcome&lt;T, std::error_code, std::exception_ptr&gt;</code>,
+an Errored Outcome is chosen preferentially to an Excepted Outcome.</p></li>
+
+<li><p>If your Coroutine were returning an <code>experimental::status_result&lt;T, system_code&gt;</code>,
+because Experimental SG14 <code>system_code</code> can transport error codes or
+exception ptrs (or indeed <code>std::error_code</code>&rsquo;s), an errored Result
+is returned.</p></li>
+</ul>
+
+
+        </div><p><small>Last revised: March 18, 2022 at 14:45:32 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/coroutines/awaitables.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/coroutines/co_await.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/coroutines/try.html b/doc/html/tutorial/essential/coroutines/try.html
new file mode 100644
index 000000000..00b716607
--- /dev/null
+++ b/doc/html/tutorial/essential/coroutines/try.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Coroutine TRY operation - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/coroutines/awaitables.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Coroutine TRY operation</h1></div></div></div>
+  <p>As one cannot call statement <code>return</code> from within a Coroutine, the very first part of Outcome&rsquo;s
+support for Coroutines is <a href="../../../reference/macros/co_tryv.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYV(expr)/BOOST_OUTCOME_CO_TRY(expr)</code></a>
+,
+which is literally the same as <code>BOOST_OUTCOME_TRY()</code> except that <code>co_return</code> is called
+to return early instead of <code>return</code>.</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">eager</span><span class="o">&lt;</span><span class="n">result</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&gt;&gt;</span> <span class="n">to_string</span><span class="p">(</span><span class="kt">int</span> <span class="n">x</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">if</span><span class="p">(</span><span class="n">x</span> <span class="o">&gt;=</span> <span class="mi">0</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="n">BOOST_OUTCOME_CO_TRY</span><span class="p">(</span><span class="n">convert</span><span class="p">(</span><span class="n">x</span><span class="p">));</span>
+  <span class="p">}</span>
+  <span class="n">co_return</span> <span class="s">&#34;out of range&#34;</span><span class="p">;</span>
+<span class="p">}</span>
+</code></pre></div>
+
+        </div><p><small>Last revised: April 07, 2020 at 10:22:38 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/coroutines/awaitables.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/no-value.html b/doc/html/tutorial/essential/no-value.html
new file mode 100644
index 000000000..64f0290b2
--- /dev/null
+++ b/doc/html/tutorial/essential/no-value.html
@@ -0,0 +1,90 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>No-value policies - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential/outcome/inspecting.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/essential/no-value/custom.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">No-value policies</h1></div></div></div>
+<p>In the previous section we have seen that it would be useful if calling member
+function <code>.value()</code> on object of type <code>outcome&lt;T&gt;</code> that did not contain a value,
+would cause an exception to be thrown according to some user-defined policy.</p>
+
+<p>Let us consider <code>result&lt;T&gt;</code> first. It is an alias to <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+,
+where <code>E</code> is the type storing error information and defaulted to
+<code>std::error_code</code>/<code>boost::system::error_code</code>, and <code>NoValuePolicy</code>
+is a <em>no-value policy</em> defaulted to <a href="../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy&lt;T, EC, EP&gt;</code></a>
+.</p>
+
+<p>The semantics of <code>basic_result::value()</code> are:</p>
+
+<ol>
+<li>Calls <code>NoValuePolicy::wide_value_check(*this)</code>.</li>
+<li>Return a reference to the contained value. If no value is actually stored,
+your program has entered undefined behaviour.</li>
+</ol>
+
+<p>Thus, the semantics of function <code>.value()</code> depend on the no-value policy. The
+default policy (<code>policy::default_policy&lt;T, EC, void&gt;</code>) for <code>EC</code> of type
+<code>std::error_code</code><sup class="footnote-ref" id="fnref:1"><a href="#fn:1">1</a></sup> does the following:</p>
+
+<ul>
+<li>If <code>r.has_value() == false</code> throws exception <code>std::system_error{r.error()}</code>,</li>
+<li>otherwise no effect.</li>
+</ul>
+
+<div class="notices note" style="background: url('../../images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>Class templates <a href="../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+ and <a href="../../reference/types/basic_outcome.html" class="api-reference"><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a></p>
+
+<p>never use exceptions. Any exception-related logic is provided exclusively
+through no-value policies.</p>
+</div>
+</div>
+
+
+<p>When designing your own success-or-failure type using templates
+<code>basic_result&lt;&gt;</code> or <code>basic_outcome&lt;&gt;</code> you have to decide what no-value policy
+you want to use. Either create your own, or <a href="../../tutorial/essential/no-value/builtin.html">use one of the predefined policies</a>.</p>
+
+<p>You can also use one of the two other predefined aliases for <code>basic_result&lt;&gt;</code>:</p>
+
+<ul>
+<li><a href="../../reference/aliases/unchecked.html" class="api-reference"><code>unchecked&lt;T, E = varies&gt;</code></a>
+: it uses policy <a href="../../reference/policies/all_narrow.html" class="api-reference"><code>all_narrow</code></a>
+, where any observation of a missing value or error is undefined behavior;</li>
+<li><a href="../../reference/aliases/checked.html" class="api-reference"><code>checked&lt;T, E = varies&gt;</code></a>
+:
+it uses policy <a href="../../reference/policies/throw_bad_result_access.html" class="api-reference"><code>throw_bad_result_access&lt;EC&gt;</code></a>
+, where any observation of a missing value or error throws <a href="../../reference/types/bad_result_access_with.html" class="api-reference"><code>bad_result_access_with&lt;EC&gt;</code></a>
+ or <a href="../../reference/types/bad_result_access.html" class="api-reference"><code>bad_result_access</code></a>
+
+respectively.</li>
+</ul>
+<div class="footnotes">
+
+<hr />
+
+<ol>
+<li id="fn:1">Similar overloads exist for throwing <code>boost::system::system_error</code> when <code>EC</code> is <code>boost::system::error_code</code>.
+ <a class="footnote-return" href="#fnref:1"><sup>[return]</sup></a></li>
+</ol>
+</div>
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential/outcome/inspecting.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
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+</html>
diff --git a/doc/html/tutorial/essential/no-value/builtin.html b/doc/html/tutorial/essential/no-value/builtin.html
new file mode 100644
index 000000000..7421c43c0
--- /dev/null
+++ b/doc/html/tutorial/essential/no-value/builtin.html
@@ -0,0 +1,151 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Built-in policies - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/no-value/custom.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/no-value.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Built-in policies</h1></div></div></div>
+  <p>These are the predefined policies built into Outcome:</p>
+
+<hr style="border-color: black;">
+
+<p>&nbsp;</p>
+
+<a href="../../../reference/policies/all_narrow.html" class="api-reference"><code>all_narrow</code></a>
+
+
+<p>If there is an observation of a value/error/exception which is not present,
+the program is put into a <strong>hard undefined behaviour</strong> situation. The
+compiler <em>literally</em> compiles no code for an invalid observation &ndash; the
+CPU &ldquo;runs off&rdquo; into the unknown.</p>
+
+<p>As bad as this may sound, it generates the most optimal code, and such
+hard UB is very tool-friendly for detection e.g. undefined behaviour
+sanitiser, valgrind memcheck, etc.</p>
+
+<p>If you are considering choosing this policy, definitely read
+<a href="../../../reference/policies/base/ub.html" class="api-reference"><code>static void _ub(Impl &amp;&amp;)</code></a>
+ first.</p>
+
+<p>Note that <a href="../../../reference/aliases/unchecked.html" class="api-reference"><code>unchecked&lt;T, E = varies&gt;</code></a>
+ aliases a <code>basic_result</code>
+with the <code>all_narrow</code> no-value policy.</p>
+
+<hr style="border-color: black;">
+
+<p>&nbsp;</p>
+
+<a href="../../../reference/policies/terminate.html" class="api-reference"><code>terminate</code></a>
+
+
+<p>Observation of a missing value/error/exception causes a call to
+<code>std::terminate()</code>.</p>
+
+<p>Note that configuring <code>EC = void</code> or <code>EP = void</code> causes
+<a href="../../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy</code></a>
+ to choose <code>terminate</code> as the no-value policy.</p>
+
+<hr style="border-color: black;">
+
+<p>&nbsp;</p>
+
+<a href="../../../reference/policies/error_code_throw_as_system_error_outcome.html" class="api-reference"><code>error_code_throw_as_system_error&lt;T, EC, EP&gt;</code></a>
+
+
+<p>This policy assumes that <code>EC</code> has the interface of <code>std::error_code</code>,
+and <code>EP</code> has the interface of <code>std::exception_ptr</code>. Upon missing value
+observation:</p>
+
+<ul>
+<li>if an exception is stored through pointer of type <code>EP</code> it is rethrown;</li>
+<li>otherwise, if an error of type <code>EC</code> is stored, it is converted to <code>error_code</code>
+and then thrown as <code>system_error</code>.</li>
+</ul>
+
+<p>Upon missing error observation throws:</p>
+
+<ul>
+<li><code>bad_result_access(&quot;no error&quot;)</code> from instances of <code>basic_result&lt;&gt;</code>.</li>
+<li><code>bad_outcome_access(&quot;no error&quot;)</code> from instances of <code>basic_outcome&lt;&gt;</code>.</li>
+</ul>
+
+<p>Upon missing exception observation throws <code>bad_outcome_access(&quot;no exception&quot;)</code>.</p>
+
+<p>Overloads are provided for <code>boost::system::error_code</code> and <code>boost::exception_ptr</code>.</p>
+
+<p>Note that if <a href="../../../reference/traits/is_error_code_available.html" class="api-reference"><code>is_error_code_available&lt;T&gt;</code></a>
+ is true for <code>EC</code>,
+and (if <code>basic_outcome</code>) <a href="../../../reference/traits/is_exception_ptr_available.html" class="api-reference"><code>is_exception_ptr_available&lt;T&gt;</code></a>
+
+is true for <code>EP</code>, <a href="../../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy</code></a>
+ chooses
+<code>error_code_throw_as_system_error&lt;T, EC, EP&gt;</code> as the no-value policy.</p>
+
+<hr style="border-color: black;">
+
+<p>&nbsp;</p>
+
+<a href="../../../reference/policies/exception_ptr_rethrow_outcome.html" class="api-reference"><code>exception_ptr_rethrow&lt;T, EC, EP&gt;</code></a>
+
+
+<p>This policy assumes that either <code>EC</code> or <code>EP</code> (unless <code>void</code>) has the interface of <code>std::exception_ptr</code>. Upon missing value observation:</p>
+
+<ul>
+<li>in instances of <code>basic_result&lt;&gt;</code>, rethrows exception pointed to by <code>EC</code>;</li>
+<li>in instances of <code>basic_outcome&lt;&gt;</code>, if exception <code>EP</code> is present rethrows it,
+otherwise rethrows <code>EC</code>.</li>
+</ul>
+
+<p>Upon missing error observation:</p>
+
+<ul>
+<li>in instances of <code>basic_result&lt;&gt;</code>, throws  <code>bad_result_access(&quot;no error&quot;)</code> ;</li>
+<li>in instances of <code>basic_outcome&lt;&gt;</code>, throws  <code>bad_outcome_access(&quot;no error&quot;)</code>.</li>
+</ul>
+
+<p>Upon missing exception observation throws <code>bad_outcome_access(&quot;no exception&quot;)</code>.</p>
+
+<p>Overloads are provided for <code>boost::exception_ptr</code>.</p>
+
+<p>Note that if <a href="../../../reference/traits/is_exception_ptr_available.html" class="api-reference"><code>is_exception_ptr_available&lt;T&gt;</code></a>
+ is true for <code>EC</code>,
+or (if <code>basic_outcome</code>) <a href="../../../reference/traits/is_exception_ptr_available.html" class="api-reference"><code>is_exception_ptr_available&lt;T&gt;</code></a>
+
+is true for <code>EP</code>, <a href="../../../reference/aliases/default_policy.html" class="api-reference"><code>default_policy</code></a>
+ chooses
+<code>exception_ptr_rethrow&lt;T, EC, EP&gt;</code> as the no-value policy.</p>
+
+<hr style="border-color: black;">
+
+<p>&nbsp;</p>
+
+<a href="../../../reference/policies/throw_bad_result_access.html" class="api-reference"><code>throw_bad_result_access&lt;EC&gt;</code></a>
+
+
+<p>Upon missing value observation throws <code>bad_result_access_with&lt;EC&gt;(ec)</code>,
+where <code>ec</code> is the value of the stored error. If error is not stored,
+the behaviour is undefined.</p>
+
+<p>Upon missing error observation throws <code>bad_result_access(&quot;no error&quot;)</code>.</p>
+
+<p>This policy can be used with <code>basic_outcome&lt;&gt;</code> instances, where it always
+throws <code>bad_outcome_access</code> for all no-value/error/exception observations.</p>
+
+<p>Note that <a href="../../../reference/aliases/checked.html" class="api-reference"><code>checked&lt;T, E = varies&gt;</code></a>
+ aliases a <code>basic_result</code>
+with the <code>throw_bad_result_access&lt;EC&gt;</code> no-value policy.</p>
+
+
+        </div><p><small>Last revised: February 09, 2019 at 15:18:26 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/no-value/custom.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/no-value.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/coroutines.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/no-value/custom.html b/doc/html/tutorial/essential/no-value/custom.html
new file mode 100644
index 000000000..321c0c6ec
--- /dev/null
+++ b/doc/html/tutorial/essential/no-value/custom.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>A custom no-value policy - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/no-value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/no-value.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/no-value/builtin.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">A custom no-value policy</h1></div></div></div>
+  <p>If you want your <code>basic_outcome&lt;&gt;</code> or <code>basic_result&lt;&gt;</code> instances to call
+<code>std::abort()</code> whenever <code>.value()</code> is called on an object that does not contain a value, or <code>.error()</code> is called on an object that does not contain an error, you will need to define your own no-value policy as follows:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">struct</span> <span class="nl">abort_policy</span> <span class="p">:</span> <span class="n">outcome</span><span class="o">::</span><span class="n">policy</span><span class="o">::</span><span class="n">base</span>
+<span class="p">{</span>
+  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">Impl</span><span class="o">&gt;</span> <span class="k">static</span> <span class="k">constexpr</span> <span class="kt">void</span> <span class="n">wide_value_check</span><span class="p">(</span><span class="n">Impl</span> <span class="o">&amp;&amp;</span><span class="n">self</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="k">if</span><span class="p">(</span><span class="o">!</span><span class="n">base</span><span class="o">::</span><span class="n">_has_value</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">Impl</span><span class="o">&gt;</span><span class="p">(</span><span class="n">self</span><span class="p">)))</span>
+      <span class="n">std</span><span class="o">::</span><span class="n">abort</span><span class="p">();</span>
+  <span class="p">}</span>
+
+  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">Impl</span><span class="o">&gt;</span> <span class="k">static</span> <span class="k">constexpr</span> <span class="kt">void</span> <span class="n">wide_error_check</span><span class="p">(</span><span class="n">Impl</span> <span class="o">&amp;&amp;</span><span class="n">self</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="k">if</span><span class="p">(</span><span class="o">!</span><span class="n">base</span><span class="o">::</span><span class="n">_has_error</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">Impl</span><span class="o">&gt;</span><span class="p">(</span><span class="n">self</span><span class="p">)))</span>
+      <span class="n">std</span><span class="o">::</span><span class="n">abort</span><span class="p">();</span>
+  <span class="p">}</span>
+
+  <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">Impl</span><span class="o">&gt;</span> <span class="k">static</span> <span class="k">constexpr</span> <span class="kt">void</span> <span class="n">wide_exception_check</span><span class="p">(</span><span class="n">Impl</span> <span class="o">&amp;&amp;</span><span class="n">self</span><span class="p">)</span>
+  <span class="p">{</span>
+    <span class="k">if</span><span class="p">(</span><span class="o">!</span><span class="n">base</span><span class="o">::</span><span class="n">_has_exception</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">forward</span><span class="o">&lt;</span><span class="n">Impl</span><span class="o">&gt;</span><span class="p">(</span><span class="n">self</span><span class="p">)))</span>
+      <span class="n">std</span><span class="o">::</span><span class="n">abort</span><span class="p">();</span>
+  <span class="p">}</span>
+<span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/policies.cpp#L36" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>All policies ought to inherit from <a href="../../../reference/policies/base.html" class="api-reference"><code>base</code></a>
+ in order to provide your policy implementation with
+the internal policy API for accessing and manipulating <code>result</code> and <code>outcome</code> state.</p>
+
+<p>Once the policy is defined, you have to specify it when providing your own
+<code>basic_outcome</code> specialization:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">template</span> <span class="o">&lt;</span><span class="k">typename</span> <span class="n">T</span><span class="o">&gt;</span>
+<span class="k">using</span> <span class="n">strictOutcome</span> <span class="o">=</span>  <span class="c1">//
+</span><span class="c1"></span><span class="n">outcome</span><span class="o">::</span><span class="n">basic_outcome</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">exception_ptr</span><span class="p">,</span> <span class="n">abort_policy</span><span class="o">&gt;</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/policies.cpp#L94" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+
+        </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/no-value.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/no-value.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/no-value/builtin.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/outcome.html b/doc/html/tutorial/essential/outcome.html
new file mode 100644
index 000000000..939719f9e
--- /dev/null
+++ b/doc/html/tutorial/essential/outcome.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>outcome&lt;&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential/result/try_ref.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/essential/outcome/inspecting.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">outcome&lt;&gt;</h1></div></div></div>
+
+
+<p>Type <a href="../../reference/aliases/outcome.html" class="api-reference"><code>outcome&lt;T, EC = varies, EP = varies, NoValuePolicy = policy::default_policy&lt;T, EC, EP&gt;&gt;</code></a>
+ represents either a successfully computed value of type <code>T</code>, or one or two reasons for failure. Failure can be represented by <code>EC</code>, or <code>EP</code>, or both, although usually it will either be an <code>EC</code> or an <code>EP</code>.
+Similarly to <code>result</code>, <code>EC</code> defaults to <code>std::error_code</code>/<code>boost::system::error_code</code>, and <code>EP</code> defaults to <code>std::exception_ptr</code>/<code>boost::exception_ptr</code>.</p>
+
+<p>The distinction is made into two types, <code>EC</code> and <code>EP</code>:</p>
+
+<ul>
+<li><code>EC</code> represents a <em>recoverable</em> failure from a lower-layer function, perhaps which was returned through <a href="../../reference/aliases/result.html" class="api-reference"><code>result&lt;T, E = varies, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+.</li>
+<li><code>EP</code> represents an <em>unrecoverable</em> failure where a C++ exception would ordinarily have been thrown. This is usually a pointer to an exception throw.</li>
+</ul>
+
+<p>It should be emphasised that this distinction is by convention only, but it will be confusing to your
+users if you deviate significantly from this convention.</p>
+
+<hr>
+
+<h3 id="legacy-codebases">Legacy codebases</h3>
+
+<p><code>outcome</code> is useful for transporting exceptions across layers of the program that were never designed with exception safety in mind.</p>
+
+<p>Consider a program consisting of three layers:</p>
+
+
+<center><img src="../../tutorial/essential/outcome/layer_chart.gif"></center>
+
+<p>The highest-level layer, <code>Layer3</code>, uses exceptions for signalling failures. The middle layer, <code>Layer2_old</code>,
+was not designed with exception safety in mind and functions need to return information about failures in return value.
+But down in the implementation details, in <code>Layer1</code>, another library is used that again throws exceptions. The goal is
+to be able to transfer an exception thrown in <code>Layer1</code> through <code>Layer2_old</code>, which is not exception-safe,
+and be able to rethrow it in <code>Layer3</code>.</p>
+
+<p>In <code>Layer1</code> we have two functions from two libraries: one reports failures by throwing exceptions, the other by returning <code>result&lt;&gt;</code>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">auto</span> <span class="nf">f</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="kt">int</span><span class="p">;</span>  <span class="c1">// throws on failure
+</span><span class="c1"></span><span class="k">auto</span> <span class="nf">g</span><span class="p">()</span> <span class="k">noexcept</span> <span class="o">-&gt;</span> <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_outcome.cpp#L36" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>In <code>Layer2_old</code> we cannot use exceptions, so its function <code>h</code> uses return type <code>outcome&lt;&gt;</code> to report failures. It is using functions <code>f</code> and <code>g</code> and reports their failures inside <code>outcome&lt;&gt;</code>:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">auto</span> <span class="n">old</span><span class="o">::</span><span class="n">h</span><span class="p">()</span> <span class="k">noexcept</span> <span class="o">-&gt;</span> <span class="n">outcome</span><span class="o">::</span><span class="n">outcome</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span>
+<span class="p">{</span>
+  <span class="n">BOOST_OUTCOME_TRY</span><span class="p">(</span><span class="k">auto</span> <span class="n">i</span><span class="p">,</span> <span class="p">(</span><span class="n">g</span><span class="p">()));</span>             <span class="c1">// #1
+</span><span class="c1"></span>    
+  <span class="k">try</span> <span class="p">{</span>
+    <span class="k">return</span> <span class="n">i</span> <span class="o">+</span> <span class="n">f</span><span class="p">();</span>
+  <span class="p">}</span>
+  <span class="k">catch</span> <span class="p">(...)</span> <span class="p">{</span>
+    <span class="k">return</span> <span class="n">std</span><span class="o">::</span><span class="n">current_exception</span><span class="p">();</span> <span class="c1">// #2
+</span><span class="c1"></span>  <span class="p">}</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_outcome.cpp#L56" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>#1. Operator <code>TRY</code> can forward failures encoded in <code>result&lt;T, EC&gt;</code> as <code>outcome&lt;T, EC, EP&gt;</code> without any loss in information. You can also use <code>TRY</code> to forward failure from one <code>outcome&lt;&gt;</code> to another.</p>
+
+<p>#2. You can store the current exception through <code>std::exception_ptr</code> inside <code>outcome&lt;T, EC, EP&gt;</code> without any loss in information
+    (provided that <code>EP</code> is <code>std::exception_ptr</code>).</p>
+
+
+
+        </div><p><small>Last revised: March 19, 2019 at 22:57:48 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential/result/try_ref.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/essential/outcome/inspecting.html"><img src="../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/outcome/inspecting.html b/doc/html/tutorial/essential/outcome/inspecting.html
new file mode 100644
index 000000000..f8e743a33
--- /dev/null
+++ b/doc/html/tutorial/essential/outcome/inspecting.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Inspecting outcome&lt;T, EC, EP&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/outcome.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/no-value.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">Inspecting outcome<T, EC, EP></h1></div></div></div>
+  <p>Continuing with the previous example, in <code>Layer3</code> we have function <code>z</code> which again reports failures via exceptions.
+It will call function <code>h</code> from <code>Layer2_old</code> which returns <code>outcome&lt;int&gt;</code> (which may store an <code>int</code> or a <code>std::error_code</code> or a <code>std::exception_ptr</code>).
+The goal is to unpack it to either the successful return value <code>int</code> or to throw an appropriate exception: if we are storing an <code>std::exception_ptr</code>, just rethrow it.
+If we are storing a <code>std::error_code</code> throw it as <code>std::system_error</code>, which is designed to store <code>std::error_code</code>&rsquo;s:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">auto</span> <span class="nf">z</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="kt">int</span> <span class="c1">// throws on failure
+</span><span class="c1"></span><span class="p">{</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">outcome</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">o</span> <span class="o">=</span> <span class="n">old</span><span class="o">::</span><span class="n">h</span><span class="p">())</span>
+    <span class="k">return</span> <span class="n">o</span><span class="p">.</span><span class="n">value</span><span class="p">();</span>
+  <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">o</span><span class="p">.</span><span class="n">has_exception</span><span class="p">())</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">rethrow_exception</span><span class="p">(</span><span class="n">o</span><span class="p">.</span><span class="n">exception</span><span class="p">());</span>
+  <span class="k">else</span>
+    <span class="k">throw</span> <span class="n">std</span><span class="o">::</span><span class="n">system_error</span><span class="p">{</span><span class="n">o</span><span class="p">.</span><span class="n">error</span><span class="p">()};</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_outcome.cpp#L70" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Function <code>has_exception()</code> checks if it is <code>EP</code> (<code>std::exception_ptr</code>) that is stored, function <code>exception()</code> accesses it. Similarly, function <code>error()</code> accesses the <code>EC</code> (<code>std::error_code</code>) if it is stored.
+<code>outcome&lt;&gt;</code> also has a function <code>has_failure()</code> to check if either <code>EC</code> or <code>EP</code> is being stored.</p>
+
+<p>It would seem obvious that the above pattern of &lsquo;unpacking&rsquo; <code>outcome&lt;&gt;</code>
+is so common that it ought to be implemented inside function <code>.value()</code>,
+so function <code>z</code> could be written as:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">return</span> <span class="n">old</span><span class="o">::</span><span class="n">h</span><span class="p">().</span><span class="n">value</span><span class="p">();</span>
+</code></pre></div>
+<p>And this is exactly what the aforementioned no-value policy template argument is for, which is described in
+the next section.</p>
+
+
+        </div><p><small>Last revised: June 19, 2020 at 15:42:26 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/outcome.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/outcome.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/no-value.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
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diff --git a/doc/html/tutorial/essential/result.html b/doc/html/tutorial/essential/result.html
new file mode 100644
index 000000000..cd361ac52
--- /dev/null
+++ b/doc/html/tutorial/essential/result.html
@@ -0,0 +1,119 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>result&lt;&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential/before.html"><img src="../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../tutorial/essential.html"><img src="../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="../../tutorial/essential/result/inspecting.html"><img src="../../images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">result&lt;&gt;</h1></div></div></div>
+<p>We will define a function that converts a <code>std::string</code> to an <code>int</code>. This function can fail for a number of reasons;
+if it does we want to communicate the failure reason.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">convert</span><span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span> <span class="n">str</span><span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_result.cpp#L42" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Template alias <a href="../../reference/aliases/result.html" class="api-reference"><code>result&lt;T, E = varies, NoValuePolicy = policy::default_policy&lt;T, E, void&gt;&gt;</code></a>
+
+has three template parameters, but the last two have default values. The first
+(<code>T</code>) represents the type of the object returned from the function upon success.
+The second (<code>EC</code>) is the type of object containing information about the reason
+for failure when the function fails. A result object stores either a <code>T</code> or an
+<code>EC</code> at any given moment, and is therefore conceptually similar to <code>variant&lt;T, EC&gt;</code>.
+<code>EC</code> is defaulted to <code>std::error_code</code> in standalone Outcome, or to <code>boost::system::error_code</code>
+in Boost.Outcome<sup class="footnote-ref" id="fnref:1"><a href="#fn:1">1</a></sup>. The third parameter (<code>NoValuePolicy</code>) is called a
+no-value policy. We will cover it later.</p>
+
+<p>If both <code>T</code> and <code>EC</code> are <a href="https://en.cppreference.com/w/cpp/named_req/TriviallyCopyable">trivially copyable</a>, <code>result&lt;T, EC, NVP&gt;</code> is also trivially copyable.
+Triviality, complexity and constexpr-ness of each operation (construction, copy construction, assignment,
+destruction etc) is always the intersection of the corresponding operation in <code>T</code> and <code>EC</code>,
+so for example if both <code>T</code> and <code>EC</code> are <a href="https://en.cppreference.com/w/cpp/named_req/LiteralType">literal types</a>, so will be <code>result&lt;T, EC, NVP&gt;</code>.
+Additionally, if both <code>T</code> and <code>EC</code> have <a href="https://en.cppreference.com/w/cpp/named_req/StandardLayoutType">standard layout</a>, <code>result&lt;T, EC, NVP&gt;</code> has standard layout;
+thus if both <code>T</code> and <code>EC</code> are C-compatible, so will <code>result&lt;T, EC, NVP&gt;</code> be C-compatible.</p>
+
+<p>Now, we will define an enumeration describing different failure situations during conversion.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">enum</span> <span class="k">class</span><span class="err"> </span><span class="nc">ConversionErrc</span>
+<span class="p">{</span>
+  <span class="n">Success</span>     <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="c1">// 0 should not represent an error
+</span><span class="c1"></span>  <span class="n">EmptyString</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="c1">// (for rationale, see tutorial on error codes)
+</span><span class="c1"></span>  <span class="n">IllegalChar</span> <span class="o">=</span> <span class="mi">2</span><span class="p">,</span>
+  <span class="n">TooLong</span>     <span class="o">=</span> <span class="mi">3</span><span class="p">,</span>
+<span class="p">};</span>
+
+<span class="c1">// all boilerplate necessary to plug ConversionErrc
+</span><span class="c1">// into std::error_code framework
+</span><span class="c1"></span></code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_result.cpp#L46" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Assume we have plugged it into <code>std::error_code</code> framework, as described in <a href="../../motivation/plug_error_code.html">this section</a>.</p>
+
+<p>One notable effect of such plugging is that <code>ConversionErrc</code> is now convertible to <code>std::error_code</code>.
+Now we can implement function <code>convert</code> as follows:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">convert</span><span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span> <span class="n">str</span><span class="p">)</span> <span class="k">noexcept</span>
+<span class="p">{</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">str</span><span class="p">.</span><span class="n">empty</span><span class="p">())</span>
+    <span class="k">return</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="n">EmptyString</span><span class="p">;</span>
+
+  <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">std</span><span class="o">::</span><span class="n">all_of</span><span class="p">(</span><span class="n">str</span><span class="p">.</span><span class="n">begin</span><span class="p">(),</span> <span class="n">str</span><span class="p">.</span><span class="n">end</span><span class="p">(),</span> <span class="o">::</span><span class="n">isdigit</span><span class="p">))</span>
+    <span class="k">return</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="n">IllegalChar</span><span class="p">;</span>
+
+  <span class="k">if</span> <span class="p">(</span><span class="n">str</span><span class="p">.</span><span class="n">length</span><span class="p">()</span> <span class="o">&gt;</span> <span class="mi">9</span><span class="p">)</span>
+    <span class="k">return</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="n">TooLong</span><span class="p">;</span>
+
+  <span class="k">return</span> <span class="nf">atoi</span><span class="p">(</span><span class="n">str</span><span class="p">.</span><span class="n">c_str</span><span class="p">());</span>
+<span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_result.cpp#L65" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p><code>result&lt;T, EC&gt;</code> is convertible from any <code>T2</code> convertible to <code>T</code> as well as any <code>EC2</code> convertible to <code>EC</code>,
+provided that there is no constructability possible in either direction between <code>T</code> and <code>EC</code>. If there is,
+all implicit conversion is disabled, and you will need to use one of the tagged constructors:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">r</span> <span class="p">{</span><span class="n">outcome</span><span class="o">::</span><span class="n">in_place_type</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">error_code</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="n">EmptyString</span><span class="p">};</span>
+<span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">s</span> <span class="p">{</span><span class="n">outcome</span><span class="o">::</span><span class="n">in_place_type</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="p">,</span> <span class="mi">1</span><span class="p">};</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_result.cpp#L115" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Or use helper functions:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">r</span> <span class="o">=</span> <span class="n">outcome</span><span class="o">::</span><span class="n">failure</span><span class="p">(</span><span class="n">ConversionErrc</span><span class="o">::</span><span class="n">EmptyString</span><span class="p">);</span>
+<span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">s</span> <span class="o">=</span> <span class="n">outcome</span><span class="o">::</span><span class="n">success</span><span class="p">(</span><span class="mi">1</span><span class="p">);</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_result.cpp#L123" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<div class="notices note" style="background: url('../../images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>The functions <a href="../../reference/functions/failure.html" class="api-reference"><code>auto failure(T &amp;&amp;, &hellip;)</code></a>
+ and <a href="../../reference/functions/success.html" class="api-reference"><code>auto success(T &amp;&amp;, &hellip;)</code></a>
+ return special
+types implicitly convertible to failed or successful <code>result</code> (and <code>outcome</code>).</p>
+</div>
+</div>
+
+<div class="footnotes">
+
+<hr />
+
+<ol>
+<li id="fn:1">You can mandate a choice using <code>std_result&lt;T&gt;</code> or <code>boost_result&lt;T&gt;</code>.
+ <a class="footnote-return" href="#fnref:1"><sup>[return]</sup></a></li>
+</ol>
+</div>
+
+
+
+        </div><p><small>Last revised: February 23, 2021 at 17:37:27 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../tutorial/essential/before.html"><img src="../../images/prev.png" alt="Prev"></a>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Inspecting result&lt;T, EC&gt; - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/result.html"><img src="../../../images/prev.png" alt="Prev"></a>
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+  <div class="titlepage"><div><div><h1 style="clear: both">Inspecting result<T, EC></h1></div></div></div>
+  <p>Suppose we will be writing a function <code>print_half</code> that takes a <code>std::string</code> representing an integer and prints half the integer:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">void</span><span class="o">&gt;</span> <span class="n">print_half</span><span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span> <span class="n">text</span><span class="p">);</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_result.cpp#L144" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>The type <code>result&lt;void&gt;</code> means that there is no value to be returned upon success, but that the operation might still fail, and we may be interested in inspecting the cause of the failure. The class template <code>result&lt;&gt;</code> is declared with the attribute <code>[[nodiscard]]</code>, which means the compiler will warn you if you forget to inspect the returned object (in C++ 17 or later).</p>
+
+<p>The implementation will do the following: if the integral number can be represented by an <code>int</code>, we will convert to <code>int</code> and use its arithmetical operations. If the number is too large, we will fall back to using a custom <code>BigInt</code> implementation that needs to allocate memory. In the implementation we will use the function <code>convert</code> defined in the previous section.</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">void</span><span class="o">&gt;</span> <span class="n">print_half</span><span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span> <span class="n">text</span><span class="p">)</span>
+<span class="p">{</span>
+  <span class="k">if</span> <span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">r</span> <span class="o">=</span> <span class="n">convert</span><span class="p">(</span><span class="n">text</span><span class="p">))</span>         <span class="c1">// #1
+</span><span class="c1"></span>  <span class="p">{</span>
+    <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="p">(</span><span class="n">r</span><span class="p">.</span><span class="n">value</span><span class="p">()</span> <span class="o">/</span> <span class="mi">2</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>        <span class="c1">// #2
+</span><span class="c1"></span>  <span class="p">}</span>
+  <span class="k">else</span>
+  <span class="p">{</span>
+    <span class="k">if</span> <span class="p">(</span><span class="n">r</span><span class="p">.</span><span class="n">error</span><span class="p">()</span> <span class="o">==</span> <span class="n">ConversionErrc</span><span class="o">::</span><span class="n">TooLong</span><span class="p">)</span>         <span class="c1">// #3
+</span><span class="c1"></span>    <span class="p">{</span>
+      <span class="n">BOOST_OUTCOME_TRY</span><span class="p">(</span><span class="k">auto</span> <span class="n">i</span><span class="p">,</span> <span class="n">BigInt</span><span class="o">::</span><span class="n">fromString</span><span class="p">(</span><span class="n">text</span><span class="p">));</span>  <span class="c1">// #4
+</span><span class="c1"></span>      <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="n">i</span><span class="p">.</span><span class="n">half</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
+    <span class="p">}</span>
+    <span class="k">else</span>
+    <span class="p">{</span>
+      <span class="k">return</span> <span class="n">r</span><span class="p">.</span><span class="n">as_failure</span><span class="p">();</span>                          <span class="c1">// #5
+</span><span class="c1"></span>    <span class="p">}</span>
+  <span class="p">}</span>
+  <span class="k">return</span> <span class="n">outcome</span><span class="o">::</span><span class="n">success</span><span class="p">();</span>                          <span class="c1">// #6
+</span><span class="c1"></span><span class="p">}</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_result.cpp#L148" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>#1. You test if <code>result&lt;&gt;</code> object represents a successful operation with contextual conversion to <code>bool</code>.</p>
+
+<p>#2. The function <code>.value()</code> extracts the successfully returned <code>int</code>.</p>
+
+<p>#3. The function <code>.error()</code> allows you to inspect the error sub-object, representing information about the reason for failure.</p>
+
+<p>#4. Macro <code>BOOST_OUTCOME_TRY</code> represents a control statement. It implies that the expression in the second argument returns a <code>result&lt;&gt;</code>. The function is defined as:</p>
+
+<div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="cm">/*static*/</span> <span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">BigInt</span><span class="o">&gt;</span> <span class="n">BigInt</span><span class="o">::</span><span class="n">fromString</span><span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span> <span class="n">s</span><span class="p">)</span>
+</code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/using_result.cpp#L137" class="code-snippet-url" target="_blank">View this code on Github</a></div>
+
+
+<p>Our control statement means: if <code>fromString</code> returned failure, this same error information should be returned from <code>print_half</code>, even though the type of <code>result&lt;&gt;</code> is different. If <code>fromString</code> returned success, we create  variable <code>i</code> of type <code>BigInt</code> with the value returned from <code>fromString</code>. If control goes to subsequent line, it means <code>fromString</code> succeeded and variable of type <code>BigInt</code> is in scope.</p>
+
+<p>#5. In the return statement we extract the error information and use it to initialize the return value from <code>print_half</code>. We could have written <code>return r.error();</code> instead,
+    and it would have the same effect, but <code>r.as_failure()</code> will work when implicit construction from <code>E</code> has been disabled due to <code>T</code> and <code>E</code> having a constructibility relationship.</p>
+
+<p>#6. Function <code>success()</code> returns an object of type <code>success&lt;void&gt;</code> representing success. This is implicitly converted by
+all <code>result</code> and <code>outcome</code> types into a successful return, default constructing any <code>T</code> if necessary.</p>
+
+
+        </div><p><small>Last revised: March 22, 2019 at 15:01:40 -0700</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/result.html"><img src="../../../images/prev.png" alt="Prev"></a>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>TRY operations - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
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+  <div class="titlepage"><div><div><h1 style="clear: both">TRY operations</h1></div></div></div>
+  
+
+<p>In the implementation of function <code>print_half</code> we have seen the usage of the macro <a href="../../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)/BOOST_OUTCOME_TRY(expr)</code></a>
+:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">BOOST_OUTCOME_TRY</span> <span class="p">(</span><span class="k">auto</span> <span class="n">i</span><span class="p">,</span> <span class="n">BigInt</span><span class="o">::</span><span class="n">fromString</span><span class="p">(</span><span class="n">text</span><span class="p">));</span>
+</code></pre></div>
+<p>The <code>BOOST_OUTCOME_TRY</code> macro uses C macro overloading to select between two implementations based on the number of
+input parameters. If there is exactly one input parameter i.e. without the <code>i</code>, the control statement is
+roughly equivalent to:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">auto</span> <span class="n">__result</span> <span class="o">=</span> <span class="n">BigInt</span><span class="o">::</span><span class="n">fromString</span><span class="p">(</span><span class="n">text</span><span class="p">);</span>
+<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">__result</span><span class="p">)</span>
+  <span class="k">return</span> <span class="n">__result</span><span class="p">.</span><span class="n">as_failure</span><span class="p">();</span>
+</code></pre></div>
+<p>Where <code>__result</code> is a compile time generated unique name. This single argument form is equivalent to
+<code>BOOST_OUTCOME_TRYV(expr)</code>, incidentally.</p>
+
+<p>If there are between two and eight parameters, this control statement is roughly equivalent to:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">auto</span> <span class="n">__result</span> <span class="o">=</span> <span class="n">BigInt</span><span class="o">::</span><span class="n">fromString</span><span class="p">(</span><span class="n">text</span><span class="p">);</span>
+<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">__result</span><span class="p">)</span>
+  <span class="k">return</span> <span class="n">__result</span><span class="p">.</span><span class="n">as_failure</span><span class="p">();</span>
+<span class="k">auto</span> <span class="n">i</span> <span class="o">=</span> <span class="n">__result</span><span class="p">.</span><span class="n">value</span><span class="p">();</span>
+</code></pre></div>
+<p>So here <code>i</code> as the first C macro parameter is set to the value of any successful result.</p>
+
+<p>C macro overloads are provided for up to eight arguments. To prevent the
+confounding of the C preprocessor by commas in template specifications causing more than
+eight arguments appearing to the C preprocessor, you should consider wrapping the
+second argument in brackets.</p>
+
+<p>If you are within a C++ Coroutine, you ought to use <a href="../../../reference/macros/co_tryv.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYV(expr)/BOOST_OUTCOME_CO_TRY(expr)</code></a>
+
+instead.</p>
+
+<hr>
+
+<h3 id="compiler-specific-extension-boost-outcome-tryx">Compiler-specific extension: <code>BOOST_OUTCOME_TRYX</code></h3>
+
+<div class="notices note" style="background: url('../../../images/note.png') top left no-repeat padding-box padding-box;">
+<div class="notices heading">note</div>
+<div class="notices message"><p>This macro makes use of a proprietary extension in GCC and clang, and is not
+portable. The macro is not made available on unsupported compilers,
+so you can test for its presence using <code>#ifdef BOOST_OUTCOME_TRYX</code>.</p>
+</div>
+</div>
+
+
+<p>GCC and Clang provide an extension to C++ known as
+<a href="https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html" title="GCC docs on statement expressions">statement expressions</a>.
+These make it possible to use a more convenient macro: <code>BOOST_OUTCOME_TRYX</code>, which is an expression. With the above macro, the above declaration of variable <code>i</code> can be rewritten to:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_TRYX</span> <span class="p">(</span><span class="n">BigInt</span><span class="o">::</span><span class="n">fromString</span><span class="p">(</span><span class="n">text</span><span class="p">));</span>
+</code></pre></div>
+<p>This has an advantage that you can use it any place where you can put an expression, e.g., in &ldquo;simple initialization&rdquo;:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">if</span> <span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_TRYX</span><span class="p">(</span><span class="n">BigInt</span><span class="o">::</span><span class="n">fromString</span><span class="p">(</span><span class="n">text</span><span class="p">)))</span>
+  <span class="n">use_a_non_zero_int</span><span class="p">(</span><span class="n">i</span><span class="p">);</span>
+</code></pre></div>
+<p>or in as a subexpression of a bigger full expression:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="kt">int</span> <span class="n">ans</span> <span class="o">=</span> <span class="n">BOOST_OUTCOME_TRYX</span><span class="p">(</span><span class="n">BigInt</span><span class="o">::</span><span class="n">fromString</span><span class="p">(</span><span class="s">&#34;1&#34;</span><span class="p">))</span> <span class="o">+</span> <span class="n">BOOST_OUTCOME_TRYX</span><span class="p">(</span><span class="n">BigInt</span><span class="o">::</span><span class="n">fromString</span><span class="p">(</span><span class="s">&#34;2&#34;</span><span class="p">));</span>
+</code></pre></div>
+<p>There is also an <a href="../../../reference/macros/co_tryx.html" class="api-reference"><code>BOOST_OUTCOME_CO_TRYX(expr)</code></a>
+ if you are inside a C++ Coroutine.</p>
+
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/result/inspecting.html"><img src="../../../images/prev.png" alt="Prev"></a>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>TRY is greedy - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
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+  <div class="titlepage"><div><div><h1 style="clear: both">TRY is greedy</h1></div></div></div>
+  <p><a href="../../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)/BOOST_OUTCOME_TRY(expr)</code></a>
+ has &lsquo;greedier&rsquo; implicit conversion semantics than
+<a href="../../../reference/types/basic_result.html" class="api-reference"><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
+. For example, this code won&rsquo;t compile:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span><span class="o">&gt;</span> <span class="n">test</span><span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">&gt;</span> <span class="n">r</span><span class="p">)</span>
+<span class="p">{</span>
+    <span class="k">return</span> <span class="n">r</span><span class="p">;</span>  <span class="c1">// you need to use explicit construction here
+</span><span class="c1"></span>    <span class="c1">// i.e. return outcome::result&lt;int&gt;(r);
+</span><span class="c1"></span><span class="p">}</span>
+</code></pre></div>
+<p>This is chosen because there is a non-trivial conversion between <code>std::errc</code> and <code>std::error_code</code>,
+so even though that conversion is implicit for <code>std::error_code</code>, Outcome does not expose the
+implicitness here in order to keep the implicit constructor count low (implicit constructors
+add significantly to build times).</p>
+
+<p>The <code>TRY</code> operation is more greedy though:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">error_code</span><span class="o">&gt;</span> <span class="n">test</span><span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="kt">int</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">errc</span><span class="o">&gt;</span> <span class="n">r</span><span class="p">)</span>
+<span class="p">{</span>
+    <span class="n">BOOST_OUTCOME_TRY</span><span class="p">(</span><span class="n">r</span><span class="p">);</span>    <span class="c1">// no explicit conversion needed
+</span><span class="c1"></span>    <span class="k">return</span> <span class="n">r</span><span class="p">.</span><span class="n">value</span><span class="p">();</span>
+<span class="p">}</span>
+</code></pre></div>
+<p>This is because <code>result&lt;int, std::error_code&gt;</code> will implicitly construct from anything which
+either <code>int</code> or <code>std::error_code</code> will implicitly construct from. However,
+<code>result&lt;int, std::error_code&gt;</code> will not implicitly construct from <code>result&lt;int, std::errc&gt;</code>.</p>
+
+<p>Thus bear this in mind during usage: <code>TRY</code> is greedier for implicit conversions than the Outcome
+types themselves.</p>
+
+
+        </div><p><small>Last revised: February 03, 2020 at 12:05:24 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/result/try.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/result/try_ref.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/tutorial/essential/result/try_ref.html b/doc/html/tutorial/essential/result/try_ref.html
new file mode 100644
index 000000000..3fa0a0ec9
--- /dev/null
+++ b/doc/html/tutorial/essential/result/try_ref.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>TRY avoiding copy/move - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="../../../css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/result/try_greedy.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/outcome.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
+  <div class="titlepage"><div><div><h1 style="clear: both">TRY avoiding copy/move</h1></div></div></div>
+  <p><a href="../../../reference/macros/tryv.html" class="api-reference"><code>BOOST_OUTCOME_TRYV(expr)/BOOST_OUTCOME_TRY(expr)</code></a>
+ works by creating an internal uniquely
+named variable which holds the value emitted by the expression. This implies that a copy
+or move operation shall be performed on the object emitted (unless you are on C++ 17 or
+later, which has guaranteed copy elision), which may be undesirable for your use case.</p>
+
+<p>You can tell <code>BOOST_OUTCOME_TRY</code> to use a reference rather than a value for the internal
+uniquely named variable like this:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// This refers to a Result containing an immovable object
+</span><span class="c1"></span><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">Immovable</span><span class="o">&gt;</span> <span class="o">&amp;&amp;</span><span class="n">res</span><span class="p">;</span>
+
+<span class="c1">// For when you do want to extract the value
+</span><span class="c1">// This creates an auto &amp;&amp;unique = res, followed by an
+</span><span class="c1">// auto &amp;&amp;v = std::move(unique).assume_value()
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_TRY</span><span class="p">((</span><span class="k">auto</span> <span class="o">&amp;&amp;</span><span class="p">,</span> <span class="n">v</span><span class="p">),</span> <span class="n">res</span><span class="p">);</span>
+</code></pre></div>
+<p>If you don&rsquo;t care about extracting the value:</p>
+<div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="c1">// For when you don&#39;t want to extract the value
+</span><span class="c1">// This creates an auto &amp;&amp;unique = res
+</span><span class="c1"></span><span class="n">BOOST_OUTCOME_TRYV2</span><span class="p">(</span><span class="k">auto</span> <span class="o">&amp;&amp;</span><span class="p">,</span> <span class="n">res</span><span class="p">);</span>
+</code></pre></div>
+
+        </div><p><small>Last revised: February 12, 2021 at 20:25:43 UTC</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../../../tutorial/essential/result/try_greedy.html"><img src="../../../images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="../../../tutorial/essential/result.html"><img src="../../../images/up.png" alt="Up"></a>
+    <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tutorial/essential/outcome.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
+</html>
diff --git a/doc/html/videos.html b/doc/html/videos.html
new file mode 100644
index 000000000..aed4550bc
--- /dev/null
+++ b/doc/html/videos.html
@@ -0,0 +1,75 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Videos - Boost.Outcome documentation</title>
+<link rel="stylesheet" href="./css/boost.css" type="text/css">
+<meta name="generator" content="Hugo 0.52 with Boostdoc theme">
+<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
+
+<link rel="icon" href="./images/favicon.ico" type="image/ico"/>
+<body><div class="spirit-nav">
+<a accesskey="p" href="./faq.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./changelog.html"><img src="./images/next.png" alt="Next"></a></div><div id="content">
+
+  <div class="titlepage"><div><div><h1 style="clear: both">Videos</h1></div></div></div>
+
+
+<p>Outcome has been presented at some of the major C++ conferences as it has
+evolved. As the older content is less relevant to Outcome today, this
+list is given in reverse chronological order.</p>
+
+<hr />
+
+<h2 id="dublin-c-users-group-2018-deterministic-disappointment">Dublin C++ users group 2018 <em>&ldquo;Deterministic Disappointment&rdquo;</em></h2>
+
+<p><em>Literature review of the WG21 papers relating to deterministically handling failure, and using libraries such as Outcome to implement the same.</em></p>
+
+
+<div style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;">
+  <iframe src="//www.youtube.com/embed/cbUTAoHy6Ls" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" allowfullscreen title="YouTube Video"></iframe>
+</div>
+
+
+<br/><iframe src="https://docs.google.com/presentation/d/e/2PACX-1vRR3_ZXU8pC_1oFH6rctPJ1wijWCQY-uGIBEK2SzOLaVnuFjn7Ed76sYs8QE6pUl-oP2nrggw-b4fma/embed?start=false&loop=false&delayms=3000" frameborder="0" width="960" height="569" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe>
+
+<hr />
+
+<h2 id="meeting-c-2017-introduction-to-proposed-std-expected-lt-t-e-gt">Meeting C++ 2017 <em>&ldquo;Introduction to proposed std::expected&lt;T, E&gt;&ldquo;</em></h2>
+
+<p><em>Literature review of the several WG21 papers relating to std::expected<T, E>.</em></p>
+
+
+<div style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;">
+  <iframe src="//www.youtube.com/embed/JfMBLx7qE0I" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" allowfullscreen title="YouTube Video"></iframe>
+</div>
+
+
+<br/><iframe src="https://docs.google.com/presentation/d/e/2PACX-1vSnTCn_hX3_uKNco8LtJTgAg2LrRO0zOJ3JiQiWMFFG8pNVwvUZr2ooYjXO9V94kdlqLxSB7DLTLPf5/embed?start=false&loop=false&delayms=3000" frameborder="0" width="960" height="569" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe>
+
+<hr />
+
+<h2 id="accu-2017-mongrel-monads-dirty-dirty-dirty">ACCU 2017 <em>&ldquo;Mongrel Monads, Dirty, dirty, dirty&rdquo;</em></h2>
+
+<p><em>Covers the history of error handling in C++, and how the LEWG Expected works.</em></p>
+
+<p><em>(Note that the Expected presented here no longer exists, it was substantially changed
+after the Outcome v1 peer review. Furthermore the Outcome presented here no longer
+exists, the peer review demanded a complete rebuild)</em></p>
+
+
+<div style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;">
+  <iframe src="//www.youtube.com/embed/XVofgKH-uu4" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" allowfullscreen title="YouTube Video"></iframe>
+</div>
+
+
+<br/><iframe src="https://docs.google.com/presentation/d/e/2PACX-1vQZXLxkB716ZIMcEqV8QkeUvKhG33BmzKJdzSvx6QRfEGjmjXjHjeLrXSjgTZwG2rCaBNAZTxj41r5n/embed?start=false&loop=false&delayms=3000" frameborder="0" width="960" height="569" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe>
+
+
+
+        </div><p><small>Last revised: September 20, 2018 at 09:21:47 &#43;0100</small></p>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="./faq.html"><img src="./images/prev.png" alt="Prev"></a>
+    <a accesskey="u" href="./index.html"><img src="./images/up.png" alt="Up"></a>
+    <a accesskey="h" href="./index.html"><img src="./images/home.png" alt="Home"></a><a accesskey="n" href="./changelog.html"><img src="./images/next.png" alt="Next"></a></div></body>
+</html>