52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
// Copyright John Maddock 2011-2021.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP
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#define BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP
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#include <boost/math/tools/config.hpp>
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#ifdef __has_include
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# if __has_include(<version>)
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# include <version>
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# ifdef __cpp_lib_is_constant_evaluated
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# include <type_traits>
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# define BOOST_MATH_HAS_IS_CONSTANT_EVALUATED
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# endif
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# endif
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#endif
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#ifdef __has_builtin
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# if __has_builtin(__builtin_is_constant_evaluated) && !defined(BOOST_NO_CXX14_CONSTEXPR) && !defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX)
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# define BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED
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# endif
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#endif
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//
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// MSVC also supports __builtin_is_constant_evaluated if it's recent enough:
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//
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#if defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 192528326)
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# define BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED
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#endif
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//
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// As does GCC-9:
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//
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#if !defined(BOOST_NO_CXX14_CONSTEXPR) && (__GNUC__ >= 9) && !defined(BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED)
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# define BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED
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#endif
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#if defined(BOOST_MATH_HAS_IS_CONSTANT_EVALUATED) && !defined(BOOST_NO_CXX14_CONSTEXPR)
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# define BOOST_MATH_IS_CONSTANT_EVALUATED(x) std::is_constant_evaluated()
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#elif defined(BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED)
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# define BOOST_MATH_IS_CONSTANT_EVALUATED(x) __builtin_is_constant_evaluated()
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#elif !defined(BOOST_NO_CXX14_CONSTEXPR) && (__GNUC__ >= 6)
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# define BOOST_MATH_IS_CONSTANT_EVALUATED(x) __builtin_constant_p(x)
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# define BOOST_MATH_USING_BUILTIN_CONSTANT_P
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#else
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# define BOOST_MATH_IS_CONSTANT_EVALUATED(x) false
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# define BOOST_MATH_NO_CONSTEXPR_DETECTION
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#endif
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#endif // BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP
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