__cxx03/__functional/unary_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___CXX03___FUNCTIONAL_UNARY_NEGATE_H
0011 #define _LIBCPP___CXX03___FUNCTIONAL_UNARY_NEGATE_H
0012
0013 #include <__cxx03/__config>
0014 #include <__cxx03/__functional/unary_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
0026 _LIBCPP_DEPRECATED_IN_CXX17 unary_negate : public __unary_function<typename _Predicate::argument_type, bool> {
0027   _Predicate __pred_;
0028
0029 public:
0030   _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI explicit unary_negate(const _Predicate& __pred)
0031       : __pred_(__pred) {}
0032   _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool
0033   operator()(const typename _Predicate::argument_type& __x) const {
0034     return !__pred_(__x);
0035   }
0036 };
0037
0038 template <class _Predicate>
0039 _LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI unary_negate<_Predicate>
0040 not1(const _Predicate& __pred) {
0041   return unary_negate<_Predicate>(__pred);
0042 }
0043
0044 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
0045
0046 _LIBCPP_END_NAMESPACE_STD
0047
0048 #endif // _LIBCPP___CXX03___FUNCTIONAL_UNARY_NEGATE_H