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   _Predicate __pred_;
28 
29 public:
30   _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI explicit unary_negate(const _Predicate& __pred)
31       : __pred_(__pred) {}
32   _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool
33   operator()(const typename _Predicate::argument_type& __x) const {
34     return !__pred_(__x);
35   }
36 };
37 
38 template <class _Predicate>
39 _LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI unary_negate<_Predicate>
40 not1(const _Predicate& __pred) {
41   return unary_negate<_Predicate>(__pred);
42 }
43 
44 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
45 
46 _LIBCPP_END_NAMESPACE_STD
47 
48 #endif // _LIBCPP___FUNCTIONAL_UNARY_NEGATE_H
49