libcxx/include/__functional/binary_negate.h

   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_BINARY_NEGATE_H
  11 #define _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H
  12
  13 #include <__config>
  14 #include <__functional/binary_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 binary_negate
  26     : public binary_function<typename _Predicate::first_argument_type,
  27                              typename _Predicate::second_argument_type,
  28                              bool>
  29 {
  30     _Predicate __pred_;
  31 public:
  32     _LIBCPP_INLINE_VISIBILITY explicit _LIBCPP_CONSTEXPR_AFTER_CXX11
  33     binary_negate(const _Predicate& __pred) : __pred_(__pred) {}
  34
  35     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
  36     bool operator()(const typename _Predicate::first_argument_type& __x,
  37                     const typename _Predicate::second_argument_type& __y) const
  38         {return !__pred_(__x, __y);}
  39 };
  40
  41 template <class _Predicate>
  42 _LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
  43 binary_negate<_Predicate>
  44 not2(const _Predicate& __pred) {return binary_negate<_Predicate>(__pred);}
  45
  46 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
  47
  48 _LIBCPP_END_NAMESPACE_STD
  49
  50 #endif // _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H