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Edit File: unordered_set

// <unordered_set> -*- C++ -*-

// Copyright (C) 2007-2019 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 include/unordered_set
 *  This is a Standard C++ Library header.
 */

#ifndef _GLIBCXX_UNORDERED_SET
#define _GLIBCXX_UNORDERED_SET 1

#pragma GCC system_header

#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else

#include <type_traits>
#include <initializer_list>
#include <bits/allocator.h>
#include <ext/alloc_traits.h>
#include <ext/aligned_buffer.h>
#include <bits/stl_pair.h>
#include <bits/stl_function.h> // equal_to, _Identity, _Select1st
#include <bits/functional_hash.h>
#include <bits/hashtable.h>
#include <bits/unordered_set.h>
#include <bits/range_access.h>
#include <bits/erase_if.h>

#ifdef _GLIBCXX_DEBUG
# include <debug/unordered_set>
#endif

#ifdef _GLIBCXX_PROFILE
# include <profile/unordered_set>
#endif

#if __cplusplus >= 201703L
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
  namespace pmr
  {
    template<typename _Tp> class polymorphic_allocator;
    template<typename _Key, typename _Hash = std::hash<_Key>,
	     typename _Pred = std::equal_to<_Key>>
      using unordered_set
	= std::unordered_set<_Key, _Hash, _Pred,
			     polymorphic_allocator<_Key>>;
    template<typename _Key, typename _Hash = std::hash<_Key>,
	     typename _Pred = std::equal_to<_Key>>
      using unordered_multiset
	= std::unordered_multiset<_Key, _Hash, _Pred,
				  polymorphic_allocator<_Key>>;
  } // namespace pmr
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++17

#if __cplusplus > 201703L
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
  template<typename _Key, typename _Hash, typename _CPred, typename _Alloc,
	   typename _Predicate>
    inline typename unordered_set<_Key, _Hash, _CPred, _Alloc>::size_type
    erase_if(unordered_set<_Key, _Hash, _CPred, _Alloc>& __cont,
	     _Predicate __pred)
    { return __detail::__erase_nodes_if(__cont, __pred); }

template<typename _Key, typename _Hash, typename _CPred, typename _Alloc,
	   typename _Predicate>
    inline typename unordered_multiset<_Key, _Hash, _CPred, _Alloc>::size_type
    erase_if(unordered_multiset<_Key, _Hash, _CPred, _Alloc>& __cont,
	     _Predicate __pred)
    { return __detail::__erase_nodes_if(__cont, __pred); }
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++20

#endif // C++11

#endif // _GLIBCXX_UNORDERED_SET