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check for HAS_CXX20_CONSTEXPR before attempting to do c++20 stuff

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This commit is contained in:
Jonas Rahlf 2021-09-02 23:20:28 +02:00
parent e5d5e576a6
commit 4e13ec151b
3 changed files with 5 additions and 4 deletions
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1
include/fast_float/fast_float.h
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@ -12,6 +12,7 @@
#if defined(__cpp_lib_bit_cast) #if defined(__cpp_lib_bit_cast)
#undef CXX20_CONSTEXPR #undef CXX20_CONSTEXPR
#define CXX20_CONSTEXPR constexpr #define CXX20_CONSTEXPR constexpr
#define HAS_CXX20_CONSTEXPR 1
#endif #endif
#endif #endif
#endif #endif

1
include/fast_float/float_common.h
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@ -81,6 +81,7 @@
#if defined(__cpp_lib_bit_cast) #if defined(__cpp_lib_bit_cast)
#undef CXX20_CONSTEXPR #undef CXX20_CONSTEXPR
#define CXX20_CONSTEXPR constexpr #define CXX20_CONSTEXPR constexpr
#define HAS_CXX20_CONSTEXPR 1
#endif #endif
#endif #endif
#endif #endif

7
tests/basictest.cpp
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@ -5,7 +5,6 @@
#include "fast_float/fast_float.h" #include "fast_float/fast_float.h"
#include <iomanip> #include <iomanip>
#include <string> #include <string>
#include <version>
#ifndef SUPPLEMENTAL_TEST_DATA_DIR #ifndef SUPPLEMENTAL_TEST_DATA_DIR
#define SUPPLEMENTAL_TEST_DATA_DIR "data/" #define SUPPLEMENTAL_TEST_DATA_DIR "data/"
@ -38,7 +37,7 @@
#define FASTFLOAT_ODDPLATFORM 1 #define FASTFLOAT_ODDPLATFORM 1
#endif #endif
#if defined(__cpp_lib_bit_cast) #if HAS_CXX20_CONSTEXPR
#include <bit> #include <bit>
#include <string_view> #include <string_view>
#endif #endif
@ -116,7 +115,7 @@ TEST_CASE("supplemental") {
} }
#endif #endif
#if defined(__cpp_lib_bit_cast) #if HAS_CXX20_CONSTEXPR
constexpr double tryParse(std::string_view input) constexpr double tryParse(std::string_view input)
{ {
@ -136,7 +135,7 @@ static_assert(tryParse("3.14156") != 3.1415600000001);
static_assert(std::isnan(tryParse("hellothere"))); // technically isnan is not constexpr but GCC and clang allow it static_assert(std::isnan(tryParse("hellothere"))); // technically isnan is not constexpr but GCC and clang allow it
#endif #endif
#endif //#if defined(__cpp_lib_bit_cast) #endif //#if HAS_CXX20_CONSTEXPR
TEST_CASE("leading_zeroes") { TEST_CASE("leading_zeroes") {
constexpr const uint64_t bit = 1; constexpr const uint64_t bit = 1;