xref: /freebsd/contrib/llvm-project/libcxx/include/__functional/binary_negate.h (revision 9f44a47fd07924afc035991af15d84e6585dea4f)
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 {
30     _Predicate __pred_;
31 public:
32     _LIBCPP_INLINE_VISIBILITY explicit _LIBCPP_CONSTEXPR_AFTER_CXX11
33     binary_negate(const _Predicate& __pred) : __pred_(__pred) {}
34 
35     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
36     bool operator()(const typename _Predicate::first_argument_type& __x,
37                     const typename _Predicate::second_argument_type& __y) const
38         {return !__pred_(__x, __y);}
39 };
40 
41 template <class _Predicate>
42 _LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
43 binary_negate<_Predicate>
44 not2(const _Predicate& __pred) {return binary_negate<_Predicate>(__pred);}
45 
46 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
47 
48 _LIBCPP_END_NAMESPACE_STD
49 
50 #endif // _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H
51