boost/math/tools/is_constant_evaluated.hpp
// Copyright John Maddock 2011-2021. // 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_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP #define BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP #include <boost/math/tools/config.hpp> #ifdef __has_include # if __has_include(<version>) # include <version> # ifdef __cpp_lib_is_constant_evaluated # include <type_traits> # define BOOST_MATH_HAS_IS_CONSTANT_EVALUATED # endif # endif #endif #ifdef __has_builtin # if __has_builtin(__builtin_is_constant_evaluated) && !defined(BOOST_MATH_NO_CXX14_CONSTEXPR) && !defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) # define BOOST_MATH_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_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED #endif // // As does GCC-9: // #if !defined(BOOST_MATH_NO_CXX14_CONSTEXPR) && (__GNUC__ >= 9) && !defined(BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED) # define BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED #endif #if defined(BOOST_MATH_HAS_IS_CONSTANT_EVALUATED) && !defined(BOOST_MATH_NO_CXX14_CONSTEXPR) # define BOOST_MATH_IS_CONSTANT_EVALUATED(x) std::is_constant_evaluated() #elif defined(BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED) # define BOOST_MATH_IS_CONSTANT_EVALUATED(x) __builtin_is_constant_evaluated() #elif !defined(BOOST_MATH_NO_CXX14_CONSTEXPR) && (__GNUC__ >= 6) # define BOOST_MATH_IS_CONSTANT_EVALUATED(x) __builtin_constant_p(x) # define BOOST_MATH_USING_BUILTIN_CONSTANT_P #else # define BOOST_MATH_IS_CONSTANT_EVALUATED(x) false # define BOOST_MATH_NO_CONSTEXPR_DETECTION #endif #endif // BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP