Mark optional as deprecated.

See #64.
mapbox · Jan 22, 2016 · 0e42ef1 · 0e42ef1
1 parent 8e4ad8a
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diff --git a/README.md b/README.md
@@ -42,8 +42,7 @@ Note: get the "2013 Nov CTP" release at http://www.microsoft.com/en-us/download/
 
 There is nothing to build, just include `variant.hpp` and
 `recursive_wrapper.hpp` in your project. Include `variant_io.hpp` if you need
-the `operator<<` overload for variant. Include `optional.hpp` to get an
-`optional<T>` class.
+the `operator<<` overload for variant.
 
 
 ## Unit Tests

diff --git a/optional.hpp b/optional.hpp
@@ -1,6 +1,8 @@
 #ifndef MAPBOX_UTIL_OPTIONAL_HPP
 #define MAPBOX_UTIL_OPTIONAL_HPP
 
+#pragma message("This implementation of optional is deprecated. See https://github.com/mapbox/variant/issues/64.")
+
 #include <type_traits>
 #include <utility>