value_type_traits.hpp

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// -*- 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.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
// notice appears in all copies, and that both that copyright notice and
// this permission notice appear in supporting documentation. None of
// the above authors, nor IBM Haifa Research Laboratories, make any
// representation about the suitability of this software for any
// purpose. It is provided "as is" without express or implied warranty.

/**
 * @file value_type_traits.hpp
 * Contains an adapter of mapping levels.
 */

template<typename Base_Key_,
	 typename Key_,
	 typename Data_,
	 class Allocator_ >
struct value_type_traits_
{
  typedef std::pair< std::pair< Base_Key_, Key_>, Data_> value_type;

  typedef
  typename Allocator_::template rebind<
    value_type>::other::reference
  reference;

  typedef
  typename Allocator_::template rebind<
    value_type>::other::const_reference
  const_reference;

  typedef
  typename Allocator_::template rebind<
    value_type>::other::pointer
  pointer;

  typedef
  typename Allocator_::template rebind<
    value_type>::other::const_pointer
  const_pointer;
};

template<typename Base_Key_, typename Key_, class Allocator_>
struct value_type_traits_<
  Base_Key_,
  Key_,
  null_data_type,
  Allocator_>
{
  typedef std::pair< Base_Key_, Key_> value_type;

  typedef
  typename Allocator_::template rebind<
    value_type>::other::const_reference
  reference;

  typedef
  typename Allocator_::template rebind<
    value_type>::other::const_reference
  const_reference;

  typedef
  typename Allocator_::template rebind<
    value_type>::other::const_pointer
  pointer;

  typedef
  typename Allocator_::template rebind<
    value_type>::other::const_pointer
  const_pointer;
};