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https://github.com/fastfloat/fast_float.git
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21fefa5b44
- FASTFLOAT_ALLOWS_LEADING_PLUS and FASTFLOAT_SKIP_WHITE_SPACE are not defined by default, and compiling with -Wundef is emitting warnigns like "FASTFLOAT_ALLOWS_LEADING_PLUS is not defined, evaluates to 0". - Likewise for FASTFLOAT_VISUAL_STUDIO, change checks to use #ifdef for that like in other places. - __cpp_lib_bit_cast and __cpp_lib_is_constant_evaluated are not defined pre-C++20, and are emitting a warning too.
41 lines
1.1 KiB
C++
41 lines
1.1 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 __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) && __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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// Testing for relevant C++20 constexpr library features
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#if FASTFLOAT_HAS_IS_CONSTANT_EVALUATED \
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&& FASTFLOAT_HAS_BIT_CAST \
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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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#endif // FASTFLOAT_CONSTEXPR_FEATURE_DETECT_H
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