hash_map

Go to the documentation of this file.

// Hashing map 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.
 *
 */

#ifndef _HASH_MAP
#define _HASH_MAP 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::_Select1st;

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

  template<class _Key, class _Tp, class _HashFn, class _EqKey, class _Alloc>
    inline bool
    operator==(const hash_map<_Key, _Tp, _HashFn, _EqKey, _Alloc>&,
           const hash_map<_Key, _Tp, _HashFn, _EqKey, _Alloc>&);

  template <class _Key, class _Tp, class _HashFcn, class _EqualKey,
        class _Alloc>
    class hash_map
    {
    private:
      typedef hashtable<pair<const _Key, _Tp>,_Key, _HashFcn,
            _Select1st<pair<const _Key, _Tp> >,
            _EqualKey, _Alloc> _Ht;

      _Ht _M_ht;

    public:
      typedef typename _Ht::key_type key_type;
      typedef _Tp data_type;
      typedef _Tp mapped_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 _Ht::pointer pointer;
      typedef typename _Ht::const_pointer const_pointer;
      typedef typename _Ht::reference reference;
      typedef typename _Ht::const_reference const_reference;
      
      typedef typename _Ht::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_map()
      : _M_ht(100, hasher(), key_equal(), allocator_type()) {}
  
      explicit
      hash_map(size_type __n)
      : _M_ht(__n, hasher(), key_equal(), allocator_type()) {}

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

      hash_map(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_map(_InputIterator __f, _InputIterator __l)
    : _M_ht(100, hasher(), key_equal(), allocator_type())
        { _M_ht.insert_unique(__f, __l); }

      template <class _InputIterator>
        hash_map(_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_map(_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_map(_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_map& __hs)
      { _M_ht.swap(__hs._M_ht); }

      template <class _K1, class _T1, class _HF, class _EqK, class _Al>
        friend bool
        operator== (const hash_map<_K1, _T1, _HF, _EqK, _Al>&,
            const hash_map<_K1, _T1, _HF, _EqK, _Al>&);

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

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

      const_iterator
      begin() const
      { return _M_ht.begin(); }

      const_iterator
      end() const
      { return _M_ht.end(); }

    public:
      pair<iterator, bool>
      insert(const value_type& __obj)
      { return _M_ht.insert_unique(__obj); }

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

      pair<iterator, bool>
      insert_noresize(const value_type& __obj)
      { return _M_ht.insert_unique_noresize(__obj); }

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

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

      _Tp&
      operator[](const key_type& __key)
      { return _M_ht.find_or_insert(value_type(__key, _Tp())).second; }

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

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

      pair<const_iterator, const_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 _Key, class _Tp, class _HashFcn, class _EqlKey, class _Alloc>
    inline bool
    operator==(const hash_map<_Key, _Tp, _HashFcn, _EqlKey, _Alloc>& __hm1,
           const hash_map<_Key, _Tp, _HashFcn, _EqlKey, _Alloc>& __hm2)
    { return __hm1._M_ht == __hm2._M_ht; }

  template <class _Key, class _Tp, class _HashFcn, class _EqlKey, class _Alloc>
    inline bool
    operator!=(const hash_map<_Key, _Tp, _HashFcn, _EqlKey, _Alloc>& __hm1,
           const hash_map<_Key, _Tp, _HashFcn, _EqlKey, _Alloc>& __hm2)
    { return !(__hm1 == __hm2); }

  template <class _Key, class _Tp, class _HashFcn, class _EqlKey, class _Alloc>
    inline void
    swap(hash_map<_Key, _Tp, _HashFcn, _EqlKey, _Alloc>& __hm1,
     hash_map<_Key, _Tp, _HashFcn, _EqlKey, _Alloc>& __hm2)
    { __hm1.swap(__hm2); }

  // Forward declaration of equality operator; needed for friend declaration.

  template <class _Key, class _Tp,
        class _HashFcn  = hash<_Key>,
        class _EqualKey = equal_to<_Key>,
        class _Alloc =  allocator<_Tp> >
    class hash_multimap;

  template <class _Key, class _Tp, class _HF, class _EqKey, class _Alloc>
    inline bool
    operator==(const hash_multimap<_Key, _Tp, _HF, _EqKey, _Alloc>& __hm1,
           const hash_multimap<_Key, _Tp, _HF, _EqKey, _Alloc>& __hm2);

  template <class _Key, class _Tp, class _HashFcn, class _EqualKey,
        class _Alloc>
    class hash_multimap
    {
      // concept requirements
      __glibcxx_class_requires(_Key, _SGIAssignableConcept)
      __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
      __glibcxx_class_requires3(_HashFcn, size_t, _Key, _UnaryFunctionConcept)
      __glibcxx_class_requires3(_EqualKey, _Key, _Key, _BinaryPredicateConcept)
    
    private:
      typedef hashtable<pair<const _Key, _Tp>, _Key, _HashFcn,
            _Select1st<pair<const _Key, _Tp> >, _EqualKey, _Alloc>
          _Ht;

      _Ht _M_ht;

    public:
      typedef typename _Ht::key_type key_type;
      typedef _Tp data_type;
      typedef _Tp mapped_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 _Ht::pointer pointer;
      typedef typename _Ht::const_pointer const_pointer;
      typedef typename _Ht::reference reference;
      typedef typename _Ht::const_reference const_reference;
      
      typedef typename _Ht::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_multimap()
      : _M_ht(100, hasher(), key_equal(), allocator_type()) {}

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

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

      hash_multimap(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_multimap(_InputIterator __f, _InputIterator __l)
    : _M_ht(100, hasher(), key_equal(), allocator_type())
        { _M_ht.insert_equal(__f, __l); }

      template <class _InputIterator>
        hash_multimap(_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_multimap(_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_multimap(_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); }

    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_multimap& __hs)
      { _M_ht.swap(__hs._M_ht); }

      template <class _K1, class _T1, class _HF, class _EqK, class _Al>
        friend bool
        operator==(const hash_multimap<_K1, _T1, _HF, _EqK, _Al>&,
           const hash_multimap<_K1, _T1, _HF, _EqK, _Al>&);

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

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

      const_iterator
      begin() const
      { return _M_ht.begin(); }

      const_iterator
      end() const
      { return _M_ht.end(); }

public:
      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)
      { return _M_ht.find(__key); }

      const_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)
      { return _M_ht.equal_range(__key); }

      pair<const_iterator, const_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 _Key, class _Tp, class _HF, class _EqKey, class _Alloc>
    inline bool
    operator==(const hash_multimap<_Key, _Tp, _HF, _EqKey, _Alloc>& __hm1,
           const hash_multimap<_Key, _Tp, _HF, _EqKey, _Alloc>& __hm2)
    { return __hm1._M_ht == __hm2._M_ht; }

  template <class _Key, class _Tp, class _HF, class _EqKey, class _Alloc>
    inline bool
    operator!=(const hash_multimap<_Key, _Tp, _HF, _EqKey, _Alloc>& __hm1,
           const hash_multimap<_Key, _Tp, _HF, _EqKey, _Alloc>& __hm2)
    { return !(__hm1 == __hm2); }

  template <class _Key, class _Tp, class _HashFcn, class _EqlKey, class _Alloc>
    inline void
    swap(hash_multimap<_Key, _Tp, _HashFcn, _EqlKey, _Alloc>& __hm1,
     hash_multimap<_Key, _Tp, _HashFcn, _EqlKey, _Alloc>& __hm2)
    { __hm1.swap(__hm2); }

} // namespace __gnu_cxx

namespace std
{
// Specialization of insert_iterator so that it will work for hash_map
// and hash_multimap.

  template <class _Key, class _Tp, class _HashFn,  class _EqKey, class _Alloc>
    class insert_iterator<__gnu_cxx::hash_map<_Key, _Tp, _HashFn,
                          _EqKey, _Alloc> >
    {
    protected:
      typedef __gnu_cxx::hash_map<_Key, _Tp, _HashFn, _EqKey, _Alloc>
        _Container;
      _Container* container;

    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; }
    };

  template <class _Key, class _Tp, class _HashFn,  class _EqKey, class _Alloc>
    class insert_iterator<__gnu_cxx::hash_multimap<_Key, _Tp, _HashFn,
                           _EqKey, _Alloc> >
    {
    protected:
      typedef __gnu_cxx::hash_multimap<_Key, _Tp, _HashFn, _EqKey, _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; }
    };
} // namespace std

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

#endif

---