v1/__functional/binary_negate.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H
0011 #define _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H
0012
0013 #include <__config>
0014 #include <__functional/binary_function.h>
0015
0016 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0017 #  pragma GCC system_header
0018 #endif
0019
0020 _LIBCPP_BEGIN_NAMESPACE_STD
0021
0022 #if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
0023
0024 template <class _Predicate>
0025 class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 binary_negate
0026     : public __binary_function<typename _Predicate::first_argument_type,
0027                                typename _Predicate::second_argument_type,
0028                                bool> {
0029   _Predicate __pred_;
0030
0031 public:
0032   _LIBCPP_HIDE_FROM_ABI explicit _LIBCPP_CONSTEXPR_SINCE_CXX14 binary_negate(const _Predicate& __pred)
0033       : __pred_(__pred) {}
0034
0035   _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool operator()(
0036       const typename _Predicate::first_argument_type& __x, const typename _Predicate::second_argument_type& __y) const {
0037     return !__pred_(__x, __y);
0038   }
0039 };
0040
0041 template <class _Predicate>
0042 _LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI binary_negate<_Predicate>
0043 not2(const _Predicate& __pred) {
0044   return binary_negate<_Predicate>(__pred);
0045 }
0046
0047 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
0048
0049 _LIBCPP_END_NAMESPACE_STD
0050
0051 #endif // _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H