| 1 | // Copyright 2020-2023 Daniel Lemire |
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| 2 | // Copyright 2023 Matt Borland |
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| 3 | // Distributed under the Boost Software License, Version 1.0. |
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| 4 | // https://www.boost.org/LICENSE_1_0.txt |
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| 5 | // |
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| 6 | // Derivative of: https://github.com/fastfloat/fast_float |
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| 7 | |
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| 8 | #ifndef BOOST_CHARCONV_DETAIL_FASTFLOAT_CONSTEXPR_FEATURE_DETECT_HPP |
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| 9 | #define BOOST_CHARCONV_DETAIL_FASTFLOAT_CONSTEXPR_FEATURE_DETECT_HPP |
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| 10 | |
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| 11 | #ifdef __has_include |
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| 12 | #if __has_include(<version>) |
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| 13 | #include <version> |
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| 14 | #endif |
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| 15 | #endif |
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| 16 | |
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| 17 | // Testing for https://wg21.link/N3652, adopted in C++14 |
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| 18 | #if __cpp_constexpr >= 201304 |
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| 19 | #define BOOST_CHARCONV_FASTFLOAT_CONSTEXPR14 constexpr |
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| 20 | #else |
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| 21 | #define BOOST_CHARCONV_FASTFLOAT_CONSTEXPR14 |
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| 22 | #endif |
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| 23 | |
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| 24 | #if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L |
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| 25 | #define BOOST_CHARCONV_FASTFLOAT_HAS_BIT_CAST 1 |
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| 26 | #else |
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| 27 | #define BOOST_CHARCONV_FASTFLOAT_HAS_BIT_CAST 0 |
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| 28 | #endif |
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| 29 | |
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| 30 | #if defined(__cpp_lib_is_constant_evaluated) && __cpp_lib_is_constant_evaluated >= 201811L |
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| 31 | #define BOOST_CHARCONV_FASTFLOAT_HAS_IS_CONSTANT_EVALUATED 1 |
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| 32 | #else |
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| 33 | #define BOOST_CHARCONV_FASTFLOAT_HAS_IS_CONSTANT_EVALUATED 0 |
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| 34 | #endif |
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| 35 | |
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| 36 | // Testing for relevant C++20 constexpr library features |
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| 37 | #if BOOST_CHARCONV_FASTFLOAT_HAS_IS_CONSTANT_EVALUATED \ |
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| 38 | && BOOST_CHARCONV_FASTFLOAT_HAS_BIT_CAST \ |
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| 39 | && __cpp_lib_constexpr_algorithms >= 201806L /*For std::copy and std::fill*/ |
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| 40 | #define BOOST_CHARCONV_FASTFLOAT_CONSTEXPR20 constexpr |
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| 41 | #define BOOST_CHARCONV_FASTFLOAT_IS_CONSTEXPR 1 |
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| 42 | #else |
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| 43 | #define BOOST_CHARCONV_FASTFLOAT_CONSTEXPR20 |
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| 44 | #define BOOST_CHARCONV_FASTFLOAT_IS_CONSTEXPR 0 |
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| 45 | #endif |
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| 46 | |
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| 47 | #endif // BOOST_CHARCONV_FASTFLOAT_CONSTEXPR_FEATURE_DETECT_H |
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| 48 | |
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