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_NEGATION_H 10#define _LIBCPP___TYPE_TRAITS_NEGATION_H 11 12#include <__config> 13#include <__type_traits/integral_constant.h> 14 15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 16# pragma GCC system_header 17#endif 18 19_LIBCPP_BEGIN_NAMESPACE_STD 20 21template <class _Pred> 22struct _Not : _BoolConstant<!_Pred::value> {}; 23 24#if _LIBCPP_STD_VER > 14 25template <class _Tp> 26struct negation : _Not<_Tp> {}; 27template<class _Tp> 28inline constexpr bool negation_v = !_Tp::value; 29#endif // _LIBCPP_STD_VER > 14 30 31_LIBCPP_END_NAMESPACE_STD 32 33#endif // _LIBCPP___TYPE_TRAITS_NEGATION_H 34