| 1 | // Copyright John Maddock 2011-2021. |
|---|
| 2 | // Use, modification and distribution are subject to the |
|---|
| 3 | // Boost Software License, Version 1.0. (See accompanying file |
|---|
| 4 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
|---|
| 5 | |
|---|
| 6 | #ifndef BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP |
|---|
| 7 | #define BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP |
|---|
| 8 | |
|---|
| 9 | #include <boost/math/tools/config.hpp> |
|---|
| 10 | |
|---|
| 11 | #ifdef __has_include |
|---|
| 12 | # if __has_include(<version>) |
|---|
| 13 | # include <version> |
|---|
| 14 | # ifdef __cpp_lib_is_constant_evaluated |
|---|
| 15 | # include <type_traits> |
|---|
| 16 | # define BOOST_MATH_HAS_IS_CONSTANT_EVALUATED |
|---|
| 17 | # endif |
|---|
| 18 | # endif |
|---|
| 19 | #endif |
|---|
| 20 | |
|---|
| 21 | #ifdef __has_builtin |
|---|
| 22 | # if __has_builtin(__builtin_is_constant_evaluated) && !defined(BOOST_MATH_NO_CXX14_CONSTEXPR) && !defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) |
|---|
| 23 | # define BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED |
|---|
| 24 | # endif |
|---|
| 25 | #endif |
|---|
| 26 | // |
|---|
| 27 | // MSVC also supports __builtin_is_constant_evaluated if it's recent enough: |
|---|
| 28 | // |
|---|
| 29 | #if defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 192528326) |
|---|
| 30 | # define BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED |
|---|
| 31 | #endif |
|---|
| 32 | // |
|---|
| 33 | // As does GCC-9: |
|---|
| 34 | // |
|---|
| 35 | #if !defined(BOOST_MATH_NO_CXX14_CONSTEXPR) && (__GNUC__ >= 9) && !defined(BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED) |
|---|
| 36 | # define BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED |
|---|
| 37 | #endif |
|---|
| 38 | |
|---|
| 39 | #if defined(BOOST_MATH_HAS_IS_CONSTANT_EVALUATED) && !defined(BOOST_MATH_NO_CXX14_CONSTEXPR) |
|---|
| 40 | # define BOOST_MATH_IS_CONSTANT_EVALUATED(x) std::is_constant_evaluated() |
|---|
| 41 | #elif defined(BOOST_MATH_HAS_BUILTIN_IS_CONSTANT_EVALUATED) |
|---|
| 42 | # define BOOST_MATH_IS_CONSTANT_EVALUATED(x) __builtin_is_constant_evaluated() |
|---|
| 43 | #elif !defined(BOOST_MATH_NO_CXX14_CONSTEXPR) && (__GNUC__ >= 6) |
|---|
| 44 | # define BOOST_MATH_IS_CONSTANT_EVALUATED(x) __builtin_constant_p(x) |
|---|
| 45 | # define BOOST_MATH_USING_BUILTIN_CONSTANT_P |
|---|
| 46 | #else |
|---|
| 47 | # define BOOST_MATH_IS_CONSTANT_EVALUATED(x) false |
|---|
| 48 | # define BOOST_MATH_NO_CONSTEXPR_DETECTION |
|---|
| 49 | #endif |
|---|
| 50 | |
|---|
| 51 | #endif // BOOST_MATH_TOOLS_IS_CONSTANT_EVALUATED_HPP |
|---|
| 52 | |
|---|
