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 
24 template <class _Predicate>
25 class _LIBCPP_TEMPLATE_VIS _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 
31 public:
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 
41 template <class _Predicate>
42 _LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI binary_negate<_Predicate>
43 not2(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
52