1//===----------------------------------------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#ifndef _LIBCPP___TYPE_TRAITS_IS_VOID_H 10#define _LIBCPP___TYPE_TRAITS_IS_VOID_H 11 12#include <__config> 13#include <__type_traits/integral_constant.h> 14#include <__type_traits/is_same.h> 15#include <__type_traits/remove_cv.h> 16 17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18# pragma GCC system_header 19#endif 20 21_LIBCPP_BEGIN_NAMESPACE_STD 22 23#if __has_builtin(__is_void) 24 25template <class _Tp> 26struct _LIBCPP_TEMPLATE_VIS is_void : _BoolConstant<__is_void(_Tp)> {}; 27 28# if _LIBCPP_STD_VER >= 17 29template <class _Tp> 30inline constexpr bool is_void_v = __is_void(_Tp); 31# endif 32 33#else 34 35template <class _Tp> 36struct _LIBCPP_TEMPLATE_VIS is_void : public is_same<__remove_cv_t<_Tp>, void> {}; 37 38# if _LIBCPP_STD_VER >= 17 39template <class _Tp> 40inline constexpr bool is_void_v = is_void<_Tp>::value; 41# endif 42 43#endif // __has_builtin(__is_void) 44 45_LIBCPP_END_NAMESPACE_STD 46 47#endif // _LIBCPP___TYPE_TRAITS_IS_VOID_H 48