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[libc++] Use __is_scoped_enum for the implementation of is_scoped_enum if it's available #85580

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Merged
merged 1 commit into from
Mar 18, 2024
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[libc++] Use __is_scoped_enum for the implementation of is_scoped_enum if it's available #85580

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17 changes: 16 additions & 1 deletion libcxx/include/__type_traits/is_scoped_enum.h
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,18 @@
_LIBCPP_BEGIN_NAMESPACE_STD

#if _LIBCPP_STD_VER >= 23

// TODO: GCC and Clang both have this builtin. Remove the false case once we've updated to GCC 14.
# if __has_builtin(__is_scoped_enum)

template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_scoped_enum : bool_constant<__is_scoped_enum(_Tp)> {};

template <class _Tp>
inline constexpr bool is_scoped_enum_v = __is_scoped_enum(_Tp);

# else

template <class _Tp, bool = is_enum_v<_Tp> >
struct __is_scoped_enum_helper : false_type {};

Expand All @@ -33,7 +45,10 @@ struct _LIBCPP_TEMPLATE_VIS is_scoped_enum : public __is_scoped_enum_helper<_Tp>

template <class _Tp>
inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value;
#endif

# endif // __has_builtin(__is_scoped_enum)

#endif // _LIBCPP_STD_VER >= 23

_LIBCPP_END_NAMESPACE_STD

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