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