- Include <version> before testing __cpp_lib_* macros. Without it every
library gate read 0 in a file that included this header first (verified
with Apple Clang 21 and GCC 16 at -std=c++23).
- Detect [[likely]]/[[unlikely]] with __has_cpp_attribute. __cpp_attributes
is 200809L on every compiler, so YAMS_HAS_LIKELY_UNLIKELY was always 0.
- YAMS_HAS_REFLECTION now requires __cpp_impl_reflection and
__cpp_lib_reflection >= 202506L (P2996R13). __cpp_reflection is not a
standard macro.
- Remove YAMS_HAS_PROFILES and YAMS_PROFILE. __cpp_profiles does not
exist and C++26 did not adopt Profiles; nothing outside the test used it.
- YAMS_CPP_VERSION reads _MSVC_LANG when defined.
- get_feature_summary() reports the language mode instead of tying
"C++23" to constexpr vector/string, which are C++20 features.
- Correct the per-gate toolchain notes (flat_map: libstdc++ 15 / libc++ 20 /
MSVC 19.51; move_only_function: not in libc++; expected: Clang 18 with
libstdc++ reports 0) and drop the std::expected migration guidance:
Result<T> stays.
Tests: core_cpp23_features checks each gate against the compiler's own
feature-test macros with the header included first. New
core_cpp23_features_fallback forces every gate to 0 so the fallback paths,
including the magic_numbers runtime path, compile in every lane.
YAMS_CONSTEXPR_IF_SUPPORTED's inline fallback was invalid on a lambda; the
tests now use it on a function.
Signed-off-by: trvon <me@trevon.dev>
