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[libc++] Simplify std::is_void #99033

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Jul 17, 2024
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[libc++] Simplify std::is_void #99033

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20 changes: 2 additions & 18 deletions libcxx/include/__type_traits/is_void.h
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Original file line number Diff line number Diff line change
Expand Up @@ -11,37 +11,21 @@

#include <__config>
#include <__type_traits/integral_constant.h>
#include <__type_traits/is_same.h>
#include <__type_traits/remove_cv.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

#if __has_builtin(__is_void)

template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_void : _BoolConstant<__is_void(_Tp)> {};
struct _LIBCPP_TEMPLATE_VIS is_void : _BoolConstant<__is_same(__remove_cv(_Tp), void)> {};

# if _LIBCPP_STD_VER >= 17
template <class _Tp>
inline constexpr bool is_void_v = __is_void(_Tp);
inline constexpr bool is_void_v = __is_same(__remove_cv(_Tp), void);
# endif

#else

template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_void : public is_same<__remove_cv_t<_Tp>, void> {};

# if _LIBCPP_STD_VER >= 17
template <class _Tp>
inline constexpr bool is_void_v = is_void<_Tp>::value;
# endif

#endif // __has_builtin(__is_void)

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___TYPE_TRAITS_IS_VOID_H
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