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Add framework for is_constant_evaluated

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Matt Borland
2023-01-26 09:21:33 -08:00
parent ff4b840217
commit c7b2177145
1 changed files with 54 additions and 0 deletions
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54
include/boost/charconv/detail/is_constant_evaluated.hpp Normal file
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// Copyright John Maddock 2011-2021.
// Copyright Matt Borland 2023.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_CHARCONV_TOOLS_IS_CONSTANT_EVALUATED_HPP
#define BOOST_CHARCONV_TOOLS_IS_CONSTANT_EVALUATED_HPP
#include <boost/charconv/config.hpp>
#ifdef __has_include
# if __has_include(<version>)
# include <version>
# ifdef __cpp_lib_is_constant_evaluated
# include <type_traits>
# define BOOST_CHARCONV_HAS_IS_CONSTANT_EVALUATED
# endif
# endif
#endif
#ifdef __has_builtin
# if __has_builtin(__builtin_is_constant_evaluated) && !defined(BOOST_NO_CXX14_CONSTEXPR)
# define BOOST_CHARCONV_HAS_BUILTIN_IS_CONSTANT_EVALUATED
# endif
#endif
//
// MSVC also supports __builtin_is_constant_evaluated if it's recent enough:
//
#if defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 192528326)
# define BOOST_CHARCONV_HAS_BUILTIN_IS_CONSTANT_EVALUATED
#endif
//
// As does GCC-9:
//
#if !defined(BOOST_NO_CXX14_CONSTEXPR) && (__GNUC__ >= 9) && !defined(BOOST_CHARCONV_HAS_BUILTIN_IS_CONSTANT_EVALUATED)
# define BOOST_CHARCONV_HAS_BUILTIN_IS_CONSTANT_EVALUATED
#endif
#if defined(BOOST_CHARCONV_HAS_IS_CONSTANT_EVALUATED) && !defined(BOOST_NO_CXX14_CONSTEXPR)
# define BOOST_CHARCONV_IS_CONSTANT_EVALUATED(x) std::is_constant_evaluated()
#elif defined(BOOST_CHARCONV_HAS_BUILTIN_IS_CONSTANT_EVALUATED)
# define BOOST_CHARCONV_IS_CONSTANT_EVALUATED(x) __builtin_is_constant_evaluated()
#elif !defined(BOOST_NO_CXX14_CONSTEXPR) && (__GNUC__ >= 6)
# define BOOST_CHARCONV_IS_CONSTANT_EVALUATED(x) __builtin_constant_p(x)
# define BOOST_CHARCONV_USING_BUILTIN_CONSTANT_P
#else
# define BOOST_CHARCONV_IS_CONSTANT_EVALUATED(x) false
# define BOOST_CHARCONV_NO_CONSTEXPR_DETECTION
#endif
#endif // BOOST_CHARCONV_TOOLS_IS_CONSTANT_EVALUATED_HPP