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_UNARY_NEGATE_H
11 #define _LIBCPP___FUNCTIONAL_UNARY_NEGATE_H
12 
13 #include <__config>
14 #include <__functional/unary_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 unary_negate
26     : public __unary_function<typename _Predicate::argument_type, bool>
27 {
28     _Predicate __pred_;
29 public:
30     _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY
31     explicit unary_negate(const _Predicate& __pred)
32         : __pred_(__pred) {}
33     _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY
34     bool operator()(const typename _Predicate::argument_type& __x) const
35         {return !__pred_(__x);}
36 };
37 
38 template <class _Predicate>
39 _LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY
40 unary_negate<_Predicate>
41 not1(const _Predicate& __pred) {return unary_negate<_Predicate>(__pred);}
42 
43 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
44 
45 _LIBCPP_END_NAMESPACE_STD
46 
47 #endif // _LIBCPP___FUNCTIONAL_UNARY_NEGATE_H
48