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<type_traits>: Use the __is_scoped_enum intrinsic for Clang #5358

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Merged
merged 1 commit into from
Apr 10, 2025
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<type_traits>: Use the __is_scoped_enum intrinsic for Clang #5358

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9 changes: 9 additions & 0 deletions stl/inc/type_traits
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Original file line number Diff line number Diff line change
Expand Up @@ -334,11 +334,20 @@ _EXPORT_STD template <class _Ty>
constexpr bool is_enum_v = __is_enum(_Ty);

#if _HAS_CXX23
#if defined(__clang__) && !defined(__EDG__) \
&& __clang_major__ >= 16 // TRANSITION, DevCom-10870354, Real World Code relying on ancient Clang
_EXPORT_STD template <class _Ty>
constexpr bool is_scoped_enum_v = __is_scoped_enum(_Ty);

_EXPORT_STD template <class _Ty>
struct is_scoped_enum : bool_constant<__is_scoped_enum(_Ty)> {};
#else // ^^^ no workaround / workaround vvv
_EXPORT_STD template <class _Ty>
constexpr bool is_scoped_enum_v = conjunction_v<is_enum<_Ty>, negation<is_convertible<_Ty, int>>>;

_EXPORT_STD template <class _Ty>
struct is_scoped_enum : bool_constant<is_scoped_enum_v<_Ty>> {};
#endif // ^^^ workaround ^^^
#endif // _HAS_CXX23

_EXPORT_STD template <class _Ty>
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