Release 0.1.9

Breaking changes

• fix #63: remove c4/time.hpp and c4/time.cpp which prevented compilation in bare-metal mode (PR #64).

New features

• Added decoding of UTF codepoints: c4::decode_code_point() (PR #65).
• Experimental feature: add formatted-dumping facilities: using semantics like c4::cat(), c4::catsep() and c4::format(), where the subject is not a string buffer but a dump callback accepting strings. This still requires a string buffer for serialization of non-string types, but the buffer's required size is now limited to the max serialized size of non-string arguments, in contrast to the requirement in c4::cat() et al which is the total serialized size of every argument. This enables very efficient and generic printf-like semantics with reuse of a single small buffer, and allows direct-printing to terminal or file (PR #67). This feature is still experimental and a minor amount of changes to the API is possible.
• Added macro C4_IF_CONSTEXPR resolving to if constexpr (...) if the c++ standard is at least c++17.
• csubstr: add count(csubstr) overload.
• Add support for RISC-V architectures (PR #69).
• Add support for bare-metal compilation (PR #64).
• gcc >= 4.8 support using polyfills for missing templates and features (PR #74 and PR #68).

Fixes

• csubstr::operator==(std::nullptr_t) now returns true if either .str==nullptr or .len==0.
• Fix: bool operator==(const char (&s)[N], csubstr) and operator==(const char (&s)[N], substr). The template declaration for these functions had an extra const which prevented these functions to participate in overload resolution, which in some cases resulted in calls resolving to operator==(std::string const&, csubstr) if that header was visible (PR #64).
• Fix csubstr::last_not_of(): optional positional parameter was ignored PR #62.
• atof(), atod(), atox(), substr::is_real(), substr::first_real_span(): accept infinity, inf and nan as valid reals PR #60.
• Add missing export symbols PR #56, PR #57.
• c4/substr_fwd.hpp: fix compilation failure in Xcode 12 and earlier, where the forward declaration for std::allocator is inside the inline namespace __1, unlike later versions PR #61, reported in rapidyaml#185.
• c4/error.hpp: fix compilation failure in debug mode in Xcode 12 and earlier: __clang_major__ does not mean the same as in the common clang, and as a result the warning -Wgnu-inline-cpp-without-extern does not exist there.

Thanks

• @danngreen
• @Xeonacid
• @aviktorov
• @fargies