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Improve checks for attributes

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This commit is contained in:
Krystian Stasiowski
2020-02-28 16:40:56 -05:00
parent c3e4148ee2
commit f92cc2ab98
1 changed files with 38 additions and 29 deletions
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67
include/boost/static_string/config.hpp
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@ -34,42 +34,51 @@
#endif
// Can we use is_constant_evaluated?
// Standard version
#if __cpp_lib_is_constant_evaluated >= 201811L
#define BOOST_STATIC_STRING_IS_CONST_EVAL std::is_constant_evaluated()
#elif BOOST_STATIC_STRING_HAS_BUILTIN(__builtin_is_constant_evaluated)
#define BOOST_STATIC_STRING_IS_CONST_EVAL __builtin_is_constant_evaluated()
#endif
// This is borrowed from Boost.JSON
// https://github.com/vinniefalco/json/blob/develop/include/boost/json/detail/config.hpp
#if defined(_MSC_VER)
#define BOOST_STATIC_STRING_NORETURN __declspec(noreturn)
#elif defined(__GNUC__)
#define BOOST_STATIC_STRING_NORETURN __attribute__ ((__noreturn__))
#elif defined(__has_attribute) && defined(__SUNPRO_CC) && (__SUNPRO_CC > 0x5130)
#if __has_attribute(noreturn)
#define BOOST_STATIC_STRING_NORETURN [[noreturn]]
#endif
#elif defined(__has_cpp_attribute)
#if __has_cpp_attribute(noreturn)
#define BOOST_STATIC_STRING_NORETURN [[noreturn]]
#endif
#else
#define BOOST_STATIC_STRING_NORETURN
#define BOOST_STATIC_STRING_NO_NORETURN
// Check for an attribute
#if defined(__has_cpp_attribute)
#define BOOST_STATIC_STRING_CHECK_FOR_ATTR(x) __has_cpp_attribute(x)
#elif defined(__has_attribute)
#define BOOST_STATIC_STRING_CHECK_FOR_ATTR(x) __has_attribute(x)
#else
#define BOOST_STATIC_STRING_CHECK_FOR_ATTR(x) 0
#endif
// Can we use [[nodiscard]]?
// KRYSTIAN TODO: these checks need to be improved
#if defined(__has_attribute)
#if __has_attribute(nodiscard)
#define BOOST_STATIC_STRING_NODISCARD [[nodiscard]]
#else
// Decide which attributes we can use
#define BOOST_STATIC_STRING_UNLIKELY
#define BOOST_STATIC_STRING_NODISCARD
#define BOOST_STATIC_STRING_NORETURN
// unlikely
#if BOOST_STATIC_STRING_CHECK_FOR_ATTR(unlikely)
#undef BOOST_STATIC_STRING_UNLIKELY
#define BOOST_STATIC_STRING_UNLIKELY [[unlikely]]
#endif
#else
#define BOOST_STATIC_STRING_NODISCARD
// nodiscard
#if BOOST_STATIC_STRING_CHECK_FOR_ATTR(nodiscard)
#undef BOOST_STATIC_STRING_NODISCARD
#define BOOST_STATIC_STRING_NODISCARD [[nodiscard]]
#elif defined(_MSC_VER) && _MSC_VER >= 1700
#undef BOOST_STATIC_STRING_NODISCARD
#define BOOST_STATIC_STRING_NODISCARD _Check_return_
#elif defined(__GNUC__) || defined(__clang__)
#undef BOOST_STATIC_STRING_NODISCARD
#define BOOST_STATIC_STRING_NODISCARD __attribute__((warn_unused_result))
#endif
// noreturn
#if BOOST_STATIC_STRING_CHECK_FOR_ATTR(noreturn)
#undef BOOST_STATIC_STRING_NORETURN
#define BOOST_STATIC_STRING_NORETURN [[noreturn]]
#elif defined(_MSC_VER)
#undef BOOST_STATIC_STRING_NORETURN
#define BOOST_STATIC_STRING_NORETURN __declspec(noreturn)
#elif defined(__GNUC__) || defined(__clang__)
#undef BOOST_STATIC_STRING_NORETURN
#define BOOST_STATIC_STRING_NORETURN __attribute__((__noreturn__))
#endif
// _MSVC_LANG isn't avaliable until after VS2015
@ -84,11 +93,11 @@
#define BOOST_STATIC_STRING_STANDARD_VERSION __cplusplus
#endif
// Decide what level of constexpr we can use
#define BOOST_STATIC_STRING_CPP20_CONSTEXPR
#define BOOST_STATIC_STRING_CPP17_CONSTEXPR
#define BOOST_STATIC_STRING_CPP14_CONSTEXPR
#define BOOST_STATIC_STRING_CPP11_CONSTEXPR
#if BOOST_STATIC_STRING_STANDARD_VERSION >= 202002L
#define BOOST_STATIC_STRING_CPP20
#undef BOOST_STATIC_STRING_CPP20_CONSTEXPR
@ -113,7 +122,7 @@
// Boost and non-Boost versions of utilities
#ifndef BOOST_STATIC_STRING_STANDALONE
#ifndef BOOST_STATIC_STRING_THROW_IF
#define BOOST_STATIC_STRING_THROW_IF(cond, ex) if (cond) BOOST_THROW_EXCEPTION(ex)
#define BOOST_STATIC_STRING_THROW_IF(cond, ex) if (cond) BOOST_STATIC_STRING_UNLIKELY BOOST_THROW_EXCEPTION(ex)
#endif
#ifndef BOOST_STATIC_STRING_THROW
#define BOOST_STATIC_STRING_THROW(ex) BOOST_THROW_EXCEPTION(ex)
@ -126,7 +135,7 @@
#endif
#else
#ifndef BOOST_STATIC_STRING_THROW_IF
#define BOOST_STATIC_STRING_THROW_IF(cond, ex) if (cond) throw ex
#define BOOST_STATIC_STRING_THROW_IF(cond, ex) if (cond) BOOST_STATIC_STRING_UNLIKELY throw ex
#endif
#ifndef BOOST_STATIC_STRING_THROW
#define BOOST_STATIC_STRING_THROW(ex) throw ex