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[libc++] Use _If for conditional_t #96193

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Jun 25, 2024
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[libc++] Use _If for conditional_t #96193

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9 changes: 4 additions & 5 deletions libcxx/include/__type_traits/conditional.h
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Original file line number Diff line number Diff line change
Expand Up @@ -44,15 +44,14 @@ struct _LIBCPP_TEMPLATE_VIS conditional<false, _If, _Then> {
using type _LIBCPP_NODEBUG = _Then;
};

template <bool _Bp, class _IfRes, class _ElseRes>
using __conditional_t _LIBCPP_NODEBUG = _If<_Bp, _IfRes, _ElseRes>;

#if _LIBCPP_STD_VER >= 14
template <bool _Bp, class _IfRes, class _ElseRes>
using conditional_t _LIBCPP_NODEBUG = typename conditional<_Bp, _IfRes, _ElseRes>::type;
using conditional_t _LIBCPP_NODEBUG = __conditional_t<_Bp, _IfRes, _ElseRes>;
#endif

// Helper so we can use "conditional_t" in all language versions.
template <bool _Bp, class _If, class _Then>
using __conditional_t _LIBCPP_NODEBUG = typename conditional<_Bp, _If, _Then>::type;

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___TYPE_TRAITS_CONDITIONAL_H
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