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   _Predicate __pred_;
  30
  31 public:
  32   _LIBCPP_HIDE_FROM_ABI explicit _LIBCPP_CONSTEXPR_SINCE_CXX14 binary_negate(const _Predicate& __pred)
  33       : __pred_(__pred) {}
  34
  35   _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool operator()(
  36       const typename _Predicate::first_argument_type& __x, const typename _Predicate::second_argument_type& __y) const {
  37     return !__pred_(__x, __y);
  38   }
  39 };
  40
  41 template <class _Predicate>
  42 _LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI binary_negate<_Predicate>
  43 not2(const _Predicate& __pred) {
  44   return binary_negate<_Predicate>(__pred);
  45 }
  46
  47 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
  48
  49 _LIBCPP_END_NAMESPACE_STD
  50
  51 #endif // _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H