unordered_map

Go to the documentation of this file.

// TR1 unordered_map -*- C++ -*-

// Copyright (C) 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.

#ifndef GNU_LIBSTDCXX_TR1_UNORDERED_MAP_
#define GNU_LIBSTDCXX_TR1_UNORDERED_MAP_

#include <tr1/hashtable>
#include <tr1/functional>
#include <tr1/functional>
#include <utility>
#include <memory>

namespace std
{
namespace tr1
{
  // XXX When we get typedef templates these class definitions
  // will be unnecessary.

  template<class Key, class T,
       class Hash = hash<Key>,
       class Pred = std::equal_to<Key>,
       class Alloc = std::allocator<std::pair<const Key, T> >,
       bool cache_hash_code = false>
    class unordered_map
    : public hashtable <Key, std::pair<const Key, T>,
            Alloc,
            Internal::extract1st<std::pair<const Key, T> >, Pred,
            Hash, Internal::mod_range_hashing,
            Internal::default_ranged_hash,
            Internal::prime_rehash_policy,
            cache_hash_code, false, true>
    {
      typedef hashtable <Key, std::pair<const Key, T>,
             Alloc,
             Internal::extract1st<std::pair<const Key, T> >, Pred,
             Hash, Internal::mod_range_hashing,
             Internal::default_ranged_hash,
             Internal::prime_rehash_policy,
             cache_hash_code, false, true>
        Base;

    public:
      typedef typename Base::size_type size_type;
      typedef typename Base::hasher hasher;
      typedef typename Base::key_equal key_equal;
      typedef typename Base::allocator_type allocator_type;

      explicit
      unordered_map(size_type n = 10,
            const hasher& hf = hasher(),
            const key_equal& eql = key_equal(),
            const allocator_type& a = allocator_type())
      : Base(n, hf, Internal::mod_range_hashing(),
         Internal::default_ranged_hash(),
         eql, Internal::extract1st<std::pair<const Key, T> >(), a)
      { }

      template<typename InputIterator>
        unordered_map(InputIterator f, InputIterator l, 
              size_type n = 10,
              const hasher& hf = hasher(), 
              const key_equal& eql = key_equal(), 
              const allocator_type& a = allocator_type())
    : Base (f, l, n, hf, Internal::mod_range_hashing(),
        Internal::default_ranged_hash(),
        eql, Internal::extract1st<std::pair<const Key, T> >(), a)
    { }
    };
  
  template<class Key, class T,
       class Hash = hash<Key>,
       class Pred = std::equal_to<Key>,
       class Alloc = std::allocator<std::pair<const Key, T> >,
       bool cache_hash_code = false>
    class unordered_multimap
    : public hashtable <Key, std::pair<const Key, T>,
            Alloc,
            Internal::extract1st<std::pair<const Key, T> >, Pred,
            Hash, Internal::mod_range_hashing,
            Internal::default_ranged_hash,
            Internal::prime_rehash_policy,
            cache_hash_code, false, false>
    {
      typedef hashtable <Key, std::pair<const Key, T>,
             Alloc,
             Internal::extract1st<std::pair<const Key, T> >, Pred,
             Hash, Internal::mod_range_hashing,
             Internal::default_ranged_hash,
             Internal::prime_rehash_policy,
             cache_hash_code, false, false>
        Base;

    public:
      typedef typename Base::size_type size_type;
      typedef typename Base::hasher hasher;
      typedef typename Base::key_equal key_equal;
      typedef typename Base::allocator_type allocator_type;
      
      explicit
      unordered_multimap(size_type n = 10,
             const hasher& hf = hasher(),
             const key_equal& eql = key_equal(),
             const allocator_type& a = allocator_type())
      : Base (n, hf, Internal::mod_range_hashing(),
          Internal::default_ranged_hash(),
          eql, Internal::extract1st<std::pair<const Key, T> >(), a)
      { }


      template<typename InputIterator>
        unordered_multimap(InputIterator f, InputIterator l, 
               typename Base::size_type n = 0,
               const hasher& hf = hasher(), 
               const key_equal& eql = key_equal(), 
               const allocator_type& a = allocator_type())
    : Base (f, l, n, hf, Internal::mod_range_hashing(),
        Internal::default_ranged_hash(),
        eql, Internal::extract1st<std::pair<const Key, T> >(), a)
        { }
    };

  template<class Key, class T, class Hash, class Pred, class Alloc,
       bool cache_hash_code>
    inline void
    swap(unordered_map<Key, T, Hash, Pred, Alloc, cache_hash_code>& x,
     unordered_map<Key, T, Hash, Pred, Alloc, cache_hash_code>& y)
    { x.swap(y); }

  template<class Key, class T, class Hash, class Pred, class Alloc,
       bool cache_hash_code>
    inline void
    swap(unordered_multimap<Key, T, Hash, Pred, Alloc, cache_hash_code>& x,
     unordered_multimap<Key, T, Hash, Pred, Alloc, cache_hash_code>& y)
    { x.swap(y); }

}
}

#endif /* GNU_LIBSTDCXX_TR1_UNORDERED_MAP_ */

---