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// -*- C++ -*-

// Copyright (C) 2005, 2006 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 it_value_type_traits.hpp

 * Contains an adapter of mapping levels.

 */

template<class Base, bool Lowest>

struct base_it_key_type

{

  typedef typename Base::it_key_type type;

};

template<class Base>

struct base_it_key_type<

  Base,

  true>

{

  typedef typename Base::const_key_reference type;

};

template<typename Base_Key_,

         typename Key_,

         typename Data_,

         typename Value_,

         class Allocator_ >

struct it_value_type_traits_

{

  typedef ref_pair< Base_Key_, Key_> key_ref_pair;

  typedef

  typename Allocator_::template rebind<

    key_ref_pair>::other::const_reference

  key_ref_pair_val;

  typedef key_ref_pair_val key_type;

  typedef ref_pair< key_ref_pair_val, 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;

  struct value_type_holder

  {

    typename std::tr1::aligned_storage<sizeof(key_ref_pair),

      std::tr1::alignment_of<key_ref_pair>::value>::type  m_a_key_buf;

    typename std::tr1::aligned_storage<sizeof(value_type),

      std::tr1::alignment_of<value_type>::value>::type  m_a_value_buf;

  };

  typedef

  typename Allocator_::template rebind<

    value_type_holder>::other::reference

  value_type_hoder_valerence;

  inline static pointer

  recast(value_type_hoder_valerence r_holder)

  {

    return reinterpret_cast<pointer>(&r_holder.m_a_value_buf);

  }

  inline static void

  make_valid(value_type_hoder_valerence r_holder, Base_Key_ r_bk, Value_ r_val)

  {

    typedef

      typename Allocator_::template rebind<

      void* >::other::value_type

      void_pointer;

    void_pointer p_target = &r_holder.m_a_key_buf;

    new (p_target) key_ref_pair(r_bk, r_val.first);

    typedef

      typename Allocator_::template rebind<

      key_ref_pair>::other::pointer

      key_ref_pair_pointer;

    key_ref_pair_pointer p_key =

      reinterpret_cast<key_ref_pair_pointer>(&r_holder.m_a_key_buf);

    p_target = &r_holder.m_a_value_buf;

    new (p_target) value_type(*p_key, r_val.second);

  }

};

template<typename Base_Key_,

         typename Key_,

         typename Value_,

         class Allocator_>

struct it_value_type_traits_<

  Base_Key_,

  Key_,

  null_data_type,

  Value_,

  Allocator_>

{

  typedef ref_pair< Base_Key_, Key_> key_ref_pair;

  typedef

  typename Allocator_::template rebind<

    key_ref_pair>::other::const_reference

  key_ref_pair_val;

  typedef key_ref_pair_val key_type;

  typedef key_ref_pair 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;

  struct value_type_holder

  {

    typename std::tr1::aligned_storage<sizeof(key_ref_pair),

      std::tr1::alignment_of<key_ref_pair>::value>::type  m_a_key_buf;

    typename std::tr1::aligned_storage<sizeof(value_type),

      std::tr1::alignment_of<value_type>::value>::type  m_a_value_buf;

  };

  typedef

  typename Allocator_::template rebind<

    value_type_holder>::other::reference

  value_type_hoder_valerence;

  inline static pointer

  recast(value_type_hoder_valerence r_holder)

  {

    return reinterpret_cast<pointer>(&r_holder.m_a_value_buf);

  }

  inline static void

  make_valid(value_type_hoder_valerence r_holder, Base_Key_ r_bk, Value_ r_val)

  {

    typedef

      typename Allocator_::template rebind<

      void* >::other::value_type

      void_pointer;

    void_pointer p_target = &r_holder.m_a_value_buf;

    new (p_target) key_ref_pair(r_bk, r_val.first);

  }

};