experimental/unordered_set

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// <experimental/unordered_set> -*- C++ -*-
 
// Copyright (C) 2015-2025 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
 
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
 
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.
 
/** @file experimental/unordered_set
 *  This is a TS C++ Library header.
 *  @ingroup libfund-ts
 */
 
#ifndef _GLIBCXX_EXPERIMENTAL_UNORDERED_SET
#define _GLIBCXX_EXPERIMENTAL_UNORDERED_SET 1
 
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
 
#include <bits/requires_hosted.h> // experimental is currently omitted
 
#if __cplusplus >= 201402L
 
#include <unordered_set>
#include <bits/erase_if.h>
#include <experimental/memory_resource>
 
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
 
namespace experimental
{
inline namespace fundamentals_v2
{
  template<typename _Key, typename _Hash, typename _CPred, typename _Alloc,
           typename _Predicate>
    inline void
    erase_if(unordered_set<_Key, _Hash, _CPred, _Alloc>& __cont,
             _Predicate __pred)
    {
      _GLIBCXX_STD_C::unordered_set<_Key, _Hash, _CPred, _Alloc>&
        __ucont = __cont;
      std::__detail::__erase_nodes_if(__cont, __ucont, __pred);
    }
 
  template<typename _Key, typename _Hash, typename _CPred, typename _Alloc,
           typename _Predicate>
    inline void
    erase_if(unordered_multiset<_Key, _Hash, _CPred, _Alloc>& __cont,
             _Predicate __pred)
    {
      _GLIBCXX_STD_C::unordered_multiset<_Key, _Hash, _CPred, _Alloc>&
        __ucont = __cont;
      std::__detail::__erase_nodes_if(__cont, __ucont, __pred);
    }
 
  namespace pmr {
    template<typename _Key, typename _Hash = hash<_Key>,
             typename _Pred = equal_to<_Key>>
      using unordered_set
      = std::unordered_set<_Key, _Hash, _Pred, polymorphic_allocator<_Key>>;
 
    template<typename _Key, typename _Hash = hash<_Key>,
             typename _Pred = equal_to<_Key>>
      using unordered_multiset
      = std::unordered_multiset<_Key, _Hash, _Pred,
                                polymorphic_allocator<_Key>>;
  } // namespace pmr
 
} // namespace fundamentals_v2
} // namespace experimental
 
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
 
#endif // C++14
 
#endif // _GLIBCXX_EXPERIMENTAL_UNORDERED_SET