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
24template <class _Predicate>
25class _LIBCPP_DEPRECATED_IN_CXX17 unary_negate : public __unary_function<typename _Predicate::argument_type, bool> {
26 _Predicate __pred_;
27
28public:
29 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI explicit unary_negate(const _Predicate& __pred)
30 : __pred_(__pred) {}
31 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool
32 operator()(const typename _Predicate::argument_type& __x) const {
33 return !__pred_(__x);
34 }
35};
36
37template <class _Predicate>
38_LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI unary_negate<_Predicate>
39not1(const _Predicate& __pred) {
40 return unary_negate<_Predicate>(__pred);
41}
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