1// -*- C++ -*-
 2//===----------------------------------------------------------------------===//
 3//
 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 5// See https://llvm.org/LICENSE.txt for license information.
 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 7//
 8//===----------------------------------------------------------------------===//
 9
10#ifndef _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H
11#define _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H
12
13#include <__config>
14#include <__functional/binary_function.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17#  pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
23
24template <class _Predicate>
25class _LIBCPP_DEPRECATED_IN_CXX17 binary_negate
26    : public __binary_function<typename _Predicate::first_argument_type,
27                               typename _Predicate::second_argument_type,
28                               bool> {
29  _Predicate __pred_;
30
31public:
32  _LIBCPP_HIDE_FROM_ABI explicit _LIBCPP_CONSTEXPR_SINCE_CXX14 binary_negate(const _Predicate& __pred)
33      : __pred_(__pred) {}
34
35  _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool operator()(
36      const typename _Predicate::first_argument_type& __x, const typename _Predicate::second_argument_type& __y) const {
37    return !__pred_(__x, __y);
38  }
39};
40
41template <class _Predicate>
42_LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI binary_negate<_Predicate>
43not2(const _Predicate& __pred) {
44  return binary_negate<_Predicate>(__pred);
45}
46
47#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
48
49_LIBCPP_END_NAMESPACE_STD
50
51#endif // _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H