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[libc++] Use variable templates in is_floating_point #167141

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[libc++] Use variable templates in is_floating_point #167141

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15 changes: 8 additions & 7 deletions libcxx/include/__type_traits/is_floating_point.h
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Expand Up @@ -20,18 +20,19 @@
_LIBCPP_BEGIN_NAMESPACE_STD

// clang-format off
template <class _Tp> struct __libcpp_is_floating_point : false_type {};
template <> struct __libcpp_is_floating_point<float> : true_type {};
template <> struct __libcpp_is_floating_point<double> : true_type {};
template <> struct __libcpp_is_floating_point<long double> : true_type {};
template <class _Tp> inline const bool __is_floating_point_impl = false;
template <> inline const bool __is_floating_point_impl<float> = true;
template <> inline const bool __is_floating_point_impl<double> = true;
template <> inline const bool __is_floating_point_impl<long double> = true;
// clang-format on

template <class _Tp>
struct _LIBCPP_NO_SPECIALIZATIONS is_floating_point : __libcpp_is_floating_point<__remove_cv_t<_Tp> > {};
struct _LIBCPP_NO_SPECIALIZATIONS is_floating_point
: integral_constant<bool, __is_floating_point_impl<__remove_cv_t<_Tp> > > {};

#if _LIBCPP_STD_VER >= 17
template <class _Tp>
_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
template<class _Tp>
inline constexpr bool is_floating_point_v = __is_floating_point_impl<__remove_cv_t<_Tp>>;
#endif

_LIBCPP_END_NAMESPACE_STD
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