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Add BOOST_CHARCONV_ASSUME macro

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Matt Borland
2023-06-08 13:27:05 +02:00
parent 7b0a1f5748
commit d6e9efa791
1 changed files with 14 additions and 0 deletions
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14
include/boost/charconv/detail/config.hpp
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@@ -162,4 +162,18 @@ static_assert((BOOST_CHARCONV_ENDIAN_BIG_BYTE || BOOST_CHARCONV_ENDIAN_LITTLE_BY
# define BOOST_CHARCONV_NO_CONSTEXPR_DETECTION
#endif
#if BOOST_MSVC
# define BOOST_CHARCONV_ASSUME(expr) __assume(expr)
#elif defined(__clang__)
# define BOOST_CHARCONV_ASSUME(expr) __builtin_assume(expr)
#elif defined(__GNUC__)
# define BOOST_CHARCONV_ASSUME(expr) if (expr) {} else { __builtin_unreachable(); }
#elif defined(__has_cpp_attribute)
# if __has_cpp_attribute(assume)
# define BOOST_CHARCONV_ASSUME(expr) [[assume(expr)]]
# endif
#else
# define BOOST_CHARCONV_ASSUME(expr)
#endif
#endif // BOOST_CHARCONV_DETAIL_CONFIG_HPP