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// Hashing set implementation -*- C++ -*-

// Copyright (C) 2001-2018 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/>.

/*
 * Copyright (c) 1996
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 */

/** @file backward/hash_set
 *  This file is a GNU extension to the Standard C++ Library (possibly
 *  containing extensions from the HP/SGI STL subset).
 */

#ifndef _BACKWARD_HASH_SET
#define _BACKWARD_HASH_SET 1

#ifndef _GLIBCXX_PERMIT_BACKWARD_HASH
#include "backward_warning.h"
#endif

#include <bits/c++config.h>
#include <backward/hashtable.h>
#include <bits/concept_check.h>

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

using std::equal_to;
  using std::allocator;
  using std::pair;
  using std::_Identity;

/**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
   */
  template<class _Value, class _HashFcn  = hash<_Value>,
	   class _EqualKey = equal_to<_Value>,
	   class _Alloc = allocator<_Value> >
    class hash_set
    {
      // concept requirements
      __glibcxx_class_requires(_Value, _SGIAssignableConcept)
      __glibcxx_class_requires3(_HashFcn, size_t, _Value, _UnaryFunctionConcept)
      __glibcxx_class_requires3(_EqualKey, _Value, _Value, _BinaryPredicateConcept)

private:
      typedef hashtable<_Value, _Value, _HashFcn, _Identity<_Value>,
			_EqualKey, _Alloc> _Ht;
      _Ht _M_ht;

public:
      typedef typename _Ht::key_type key_type;
      typedef typename _Ht::value_type value_type;
      typedef typename _Ht::hasher hasher;
      typedef typename _Ht::key_equal key_equal;
      
      typedef typename _Ht::size_type size_type;
      typedef typename _Ht::difference_type difference_type;
      typedef typename _Alloc::pointer pointer;
      typedef typename _Alloc::const_pointer const_pointer;
      typedef typename _Alloc::reference reference;
      typedef typename _Alloc::const_reference const_reference;
      
      typedef typename _Ht::const_iterator iterator;
      typedef typename _Ht::const_iterator const_iterator;
      
      typedef typename _Ht::allocator_type allocator_type;
      
      hasher
      hash_funct() const
      { return _M_ht.hash_funct(); }

key_equal
      key_eq() const
      { return _M_ht.key_eq(); }

allocator_type
      get_allocator() const
      { return _M_ht.get_allocator(); }

hash_set()
      : _M_ht(100, hasher(), key_equal(), allocator_type()) {}

explicit
      hash_set(size_type __n)
      : _M_ht(__n, hasher(), key_equal(), allocator_type()) {}

hash_set(size_type __n, const hasher& __hf)
      : _M_ht(__n, __hf, key_equal(), allocator_type()) {}

hash_set(size_type __n, const hasher& __hf, const key_equal& __eql,
	       const allocator_type& __a = allocator_type())
      : _M_ht(__n, __hf, __eql, __a) {}

template<class _InputIterator>
        hash_set(_InputIterator __f, _InputIterator __l)
	: _M_ht(100, hasher(), key_equal(), allocator_type())
        { _M_ht.insert_unique(__f, __l); }

template<class _InputIterator>
        hash_set(_InputIterator __f, _InputIterator __l, size_type __n)
	: _M_ht(__n, hasher(), key_equal(), allocator_type())
        { _M_ht.insert_unique(__f, __l); }

template<class _InputIterator>
        hash_set(_InputIterator __f, _InputIterator __l, size_type __n,
		 const hasher& __hf)
	: _M_ht(__n, __hf, key_equal(), allocator_type())
        { _M_ht.insert_unique(__f, __l); }

template<class _InputIterator>
        hash_set(_InputIterator __f, _InputIterator __l, size_type __n,
		 const hasher& __hf, const key_equal& __eql,
		 const allocator_type& __a = allocator_type())
	: _M_ht(__n, __hf, __eql, __a)
        { _M_ht.insert_unique(__f, __l); }

size_type
      size() const
      { return _M_ht.size(); }

size_type
      max_size() const
      { return _M_ht.max_size(); }
      
      bool
      empty() const
      { return _M_ht.empty(); }
      
      void
      swap(hash_set& __hs)
      { _M_ht.swap(__hs._M_ht); }

template<class _Val, class _HF, class _EqK, class _Al>
        friend bool
        operator==(const hash_set<_Val, _HF, _EqK, _Al>&,
		   const hash_set<_Val, _HF, _EqK, _Al>&);

iterator
      begin() const
      { return _M_ht.begin(); }
      
      iterator
      end() const
      { return _M_ht.end(); }

pair<iterator, bool>
      insert(const value_type& __obj)
      {
	pair<typename _Ht::iterator, bool> __p = _M_ht.insert_unique(__obj);
	return pair<iterator,bool>(__p.first, __p.second);
      }

template<class _InputIterator>
        void
        insert(_InputIterator __f, _InputIterator __l)
        { _M_ht.insert_unique(__f, __l); }

pair<iterator, bool>
      insert_noresize(const value_type& __obj)
      {
	pair<typename _Ht::iterator, bool> __p
	  = _M_ht.insert_unique_noresize(__obj);
	return pair<iterator, bool>(__p.first, __p.second);
      }

iterator
      find(const key_type& __key) const
      { return _M_ht.find(__key); }

size_type
      count(const key_type& __key) const
      { return _M_ht.count(__key); }

pair<iterator, iterator>
      equal_range(const key_type& __key) const
      { return _M_ht.equal_range(__key); }

size_type
      erase(const key_type& __key)
      {return _M_ht.erase(__key); }
      
      void
      erase(iterator __it)
      { _M_ht.erase(__it); }
      
      void
      erase(iterator __f, iterator __l)
      { _M_ht.erase(__f, __l); }
      
      void
      clear()
      { _M_ht.clear(); }

void
      resize(size_type __hint)
      { _M_ht.resize(__hint); }
      
      size_type
      bucket_count() const
      { return _M_ht.bucket_count(); }
      
      size_type
      max_bucket_count() const
      { return _M_ht.max_bucket_count(); }
      
      size_type
      elems_in_bucket(size_type __n) const
      { return _M_ht.elems_in_bucket(__n); }
    };

template<class _Value, class _HashFcn, class _EqualKey, class _Alloc>
    inline bool
    operator==(const hash_set<_Value, _HashFcn, _EqualKey, _Alloc>& __hs1,
	       const hash_set<_Value, _HashFcn, _EqualKey, _Alloc>& __hs2)
    { return __hs1._M_ht == __hs2._M_ht; }

template<class _Value, class _HashFcn, class _EqualKey, class _Alloc>
    inline bool
    operator!=(const hash_set<_Value, _HashFcn, _EqualKey, _Alloc>& __hs1,
	       const hash_set<_Value, _HashFcn, _EqualKey, _Alloc>& __hs2)
    { return !(__hs1 == __hs2); }

template<class _Val, class _HashFcn, class _EqualKey, class _Alloc>
    inline void
    swap(hash_set<_Val, _HashFcn, _EqualKey, _Alloc>& __hs1,
	 hash_set<_Val, _HashFcn, _EqualKey, _Alloc>& __hs2)
    { __hs1.swap(__hs2); }

/**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
   */
  template<class _Value,
	   class _HashFcn = hash<_Value>,
	   class _EqualKey = equal_to<_Value>,
	   class _Alloc = allocator<_Value> >
    class hash_multiset
    {
      // concept requirements
      __glibcxx_class_requires(_Value, _SGIAssignableConcept)
      __glibcxx_class_requires3(_HashFcn, size_t, _Value, _UnaryFunctionConcept)
      __glibcxx_class_requires3(_EqualKey, _Value, _Value, _BinaryPredicateConcept)

private:
      typedef hashtable<_Value, _Value, _HashFcn, _Identity<_Value>,
			_EqualKey, _Alloc> _Ht;
      _Ht _M_ht;

typedef typename _Ht::const_iterator iterator;
      typedef typename _Ht::const_iterator const_iterator;
      
      typedef typename _Ht::allocator_type allocator_type;
      
      hasher
      hash_funct() const
      { return _M_ht.hash_funct(); }
      
      key_equal
      key_eq() const
      { return _M_ht.key_eq(); }
      
      allocator_type
      get_allocator() const
      { return _M_ht.get_allocator(); }

hash_multiset()
      : _M_ht(100, hasher(), key_equal(), allocator_type()) {}

explicit
      hash_multiset(size_type __n)
      : _M_ht(__n, hasher(), key_equal(), allocator_type()) {}

hash_multiset(size_type __n, const hasher& __hf)
      : _M_ht(__n, __hf, key_equal(), allocator_type()) {}
      
      hash_multiset(size_type __n, const hasher& __hf, const key_equal& __eql,
		    const allocator_type& __a = allocator_type())
      : _M_ht(__n, __hf, __eql, __a) {}

template<class _InputIterator>
        hash_multiset(_InputIterator __f, _InputIterator __l)
	: _M_ht(100, hasher(), key_equal(), allocator_type())
        { _M_ht.insert_equal(__f, __l); }

template<class _InputIterator>
        hash_multiset(_InputIterator __f, _InputIterator __l, size_type __n)
	: _M_ht(__n, hasher(), key_equal(), allocator_type())
        { _M_ht.insert_equal(__f, __l); }

template<class _InputIterator>
        hash_multiset(_InputIterator __f, _InputIterator __l, size_type __n,
		      const hasher& __hf)
	: _M_ht(__n, __hf, key_equal(), allocator_type())
        { _M_ht.insert_equal(__f, __l); }

template<class _InputIterator>
        hash_multiset(_InputIterator __f, _InputIterator __l, size_type __n,
		      const hasher& __hf, const key_equal& __eql,
		      const allocator_type& __a = allocator_type())
	: _M_ht(__n, __hf, __eql, __a)
        { _M_ht.insert_equal(__f, __l); }

size_type
      size() const
      { return _M_ht.size(); }

size_type
      max_size() const
      { return _M_ht.max_size(); }

bool
      empty() const
      { return _M_ht.empty(); }

void
      swap(hash_multiset& hs)
      { _M_ht.swap(hs._M_ht); }

template<class _Val, class _HF, class _EqK, class _Al>
        friend bool
        operator==(const hash_multiset<_Val, _HF, _EqK, _Al>&,
		   const hash_multiset<_Val, _HF, _EqK, _Al>&);

iterator
      begin() const
      { return _M_ht.begin(); }
      
      iterator
      end() const
      { return _M_ht.end(); }

iterator
      insert(const value_type& __obj)
      { return _M_ht.insert_equal(__obj); }
  
      template<class _InputIterator>
        void
        insert(_InputIterator __f, _InputIterator __l)
        { _M_ht.insert_equal(__f,__l); }
  
      iterator
      insert_noresize(const value_type& __obj)
      { return _M_ht.insert_equal_noresize(__obj); }

iterator
      find(const key_type& __key) const
      { return _M_ht.find(__key); }

size_type
      count(const key_type& __key) const
      { return _M_ht.count(__key); }

pair<iterator, iterator>
      equal_range(const key_type& __key) const
      { return _M_ht.equal_range(__key); }

size_type
      erase(const key_type& __key)
      { return _M_ht.erase(__key); }
  
      void
      erase(iterator __it)
      { _M_ht.erase(__it); }
  
      void
      erase(iterator __f, iterator __l)
      { _M_ht.erase(__f, __l); }
  
      void
      clear()
      { _M_ht.clear(); }

void
      resize(size_type __hint)
      { _M_ht.resize(__hint); }
  
      size_type
      bucket_count() const
      { return _M_ht.bucket_count(); }

size_type
      max_bucket_count() const
      { return _M_ht.max_bucket_count(); }

size_type
      elems_in_bucket(size_type __n) const
      { return _M_ht.elems_in_bucket(__n); }
    };

template<class _Val, class _HashFcn, class _EqualKey, class _Alloc>
    inline bool
    operator==(const hash_multiset<_Val, _HashFcn, _EqualKey, _Alloc>& __hs1,
	       const hash_multiset<_Val, _HashFcn, _EqualKey, _Alloc>& __hs2)
    { return __hs1._M_ht == __hs2._M_ht; }

template<class _Val, class _HashFcn, class _EqualKey, class _Alloc>
    inline bool
    operator!=(const hash_multiset<_Val, _HashFcn, _EqualKey, _Alloc>& __hs1,
	       const hash_multiset<_Val, _HashFcn, _EqualKey, _Alloc>& __hs2)
    { return !(__hs1 == __hs2); }

template<class _Val, class _HashFcn, class _EqualKey, class _Alloc>
    inline void
    swap(hash_multiset<_Val, _HashFcn, _EqualKey, _Alloc>& __hs1,
	 hash_multiset<_Val, _HashFcn, _EqualKey, _Alloc>& __hs2)
    { __hs1.swap(__hs2); }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

// Specialization of insert_iterator so that it will work for hash_set
  // and hash_multiset.
  template<class _Value, class _HashFcn, class _EqualKey, class _Alloc>
    class insert_iterator<__gnu_cxx::hash_set<_Value, _HashFcn,
					      _EqualKey, _Alloc> >
    {
    protected:
      typedef __gnu_cxx::hash_set<_Value, _HashFcn, _EqualKey, _Alloc>
        _Container;
      _Container* container;

insert_iterator(_Container& __x)
      : container(&__x) {}
      
      insert_iterator(_Container& __x, typename _Container::iterator)
      : container(&__x) {}

insert_iterator<_Container>&
      operator=(const typename _Container::value_type& __value)
      {
	container->insert(__value);
	return *this;
      }

insert_iterator<_Container>&
      operator*()
      { return *this; }
      
      insert_iterator<_Container>&
      operator++()
      { return *this; }
      
      insert_iterator<_Container>&
      operator++(int)
      { return *this; }
    };

template<class _Value, class _HashFcn, class _EqualKey, class _Alloc>
    class insert_iterator<__gnu_cxx::hash_multiset<_Value, _HashFcn,
						   _EqualKey, _Alloc> >
    {
    protected:
      typedef __gnu_cxx::hash_multiset<_Value, _HashFcn, _EqualKey, _Alloc>
        _Container;
      _Container* container;
      typename _Container::iterator iter;

public:
      typedef _Container          container_type;
      typedef output_iterator_tag iterator_category;
      typedef void                value_type;
      typedef void                difference_type;
      typedef void                pointer;
      typedef void                reference;
      
      insert_iterator(_Container& __x)
      : container(&__x) {}
      
      insert_iterator(_Container& __x, typename _Container::iterator)
      : container(&__x) {}

insert_iterator<_Container>&
      operator=(const typename _Container::value_type& __value)
      {
	container->insert(__value);
	return *this;
      }

insert_iterator<_Container>&
      operator*()
      { return *this; }

insert_iterator<_Container>&
      operator++()
      { return *this; }

insert_iterator<_Container>&
      operator++(int) { return *this; }
    };

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif

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✏️ hash_set