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54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
#ifndef FASTFLOAT_CONSTEXPR_FEATURE_DETECT_H
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#define FASTFLOAT_CONSTEXPR_FEATURE_DETECT_H
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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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#endif
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#endif
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// Testing for https://wg21.link/N3652, adopted in C++14
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#if defined(__cpp_constexpr) && __cpp_constexpr >= 201304
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#define FASTFLOAT_CONSTEXPR14 constexpr
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#else
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#define FASTFLOAT_CONSTEXPR14
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#endif
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#if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L
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#define FASTFLOAT_HAS_BIT_CAST 1
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#else
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#define FASTFLOAT_HAS_BIT_CAST 0
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#endif
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#if defined(__cpp_lib_is_constant_evaluated) && \
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__cpp_lib_is_constant_evaluated >= 201811L
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#define FASTFLOAT_HAS_IS_CONSTANT_EVALUATED 1
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#else
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#define FASTFLOAT_HAS_IS_CONSTANT_EVALUATED 0
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#endif
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#if defined(__cpp_if_constexpr) && __cpp_if_constexpr >= 201606L
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#define FASTFLOAT_IF_CONSTEXPR17(x) if constexpr (x)
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#else
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#define FASTFLOAT_IF_CONSTEXPR17(x) if (x)
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#endif
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// Testing for relevant C++20 constexpr library features
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#if FASTFLOAT_HAS_IS_CONSTANT_EVALUATED && FASTFLOAT_HAS_BIT_CAST && \
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defined(__cpp_lib_constexpr_algorithms) && \
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__cpp_lib_constexpr_algorithms >= 201806L /*For std::copy and std::fill*/
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#define FASTFLOAT_CONSTEXPR20 constexpr
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#define FASTFLOAT_IS_CONSTEXPR 1
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#else
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#define FASTFLOAT_CONSTEXPR20
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#define FASTFLOAT_IS_CONSTEXPR 0
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#endif
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#if __cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
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#define FASTFLOAT_DETAIL_MUST_DEFINE_CONSTEXPR_VARIABLE 0
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#else
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#define FASTFLOAT_DETAIL_MUST_DEFINE_CONSTEXPR_VARIABLE 1
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#endif
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#endif // FASTFLOAT_CONSTEXPR_FEATURE_DETECT_H
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