hash_set

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

// Copyright (C) 2001, 2002, 2004, 2005 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 2, 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.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

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

#ifndef _HASH_SET
#define _HASH_SET 1

#include <ext/hashtable.h>
#include <bits/concept_check.h>

namespace __gnu_cxx
{
  using std::equal_to;
  using std::allocator;
  using std::pair;
  using std::_Identity;

  // Forward declaration of equality operator; needed for friend
  // declaration.
  template <class _Value, class _HashFcn  = hash<_Value>,
	    class _EqualKey = equal_to<_Value>,
	    class _Alloc = allocator<_Value> >
    class hash_set;

  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);

  /**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
   */
  template <class _Value, class _HashFcn, class _EqualKey, class _Alloc>
    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(); }

    public:
      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); }

    public:
      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(); }

    public:
      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(); }

public:
      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); }

  template <class _Value,
	    class _HashFcn = hash<_Value>,
	    class _EqualKey = equal_to<_Value>,
	    class _Alloc = allocator<_Value> >
    class hash_multiset;

  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);