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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

// 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 order_statistics_imp.hpp

 * Contains forward declarations for order_statistics_key

 */

PB_DS_CLASS_T_DEC

inline typename PB_DS_CLASS_C_DEC::iterator

PB_DS_CLASS_C_DEC::

find_by_order(size_type order)

{

  node_iterator it = node_begin();

  node_iterator end_it = node_end();

  while (it != end_it)

    {

      node_iterator l_it = it.get_l_child();

      const size_type o = (l_it == end_it)?

        l_it.get_metadata();

      if (order == o)

        return (*it);

      else if (order < o)

        it = l_it;

      else

        {

          order -= o + 1;

          it = it.get_r_child();

        }

    }

  return (PB_DS_BASE_C_DEC::end_iterator());

}

PB_DS_CLASS_T_DEC

inline typename PB_DS_CLASS_C_DEC::const_iterator

PB_DS_CLASS_C_DEC::

find_by_order(size_type order) const

{

  return (const_cast<PB_DS_CLASS_C_DEC* >(this)->find_by_order(order));

}

PB_DS_CLASS_T_DEC

inline typename PB_DS_CLASS_C_DEC::size_type

PB_DS_CLASS_C_DEC::

order_of_key(const_key_reference r_key) const

{

  const_node_iterator it = node_begin();

  const_node_iterator end_it = node_end();

  const cmp_fn& r_cmp_fn =

    const_cast<PB_DS_CLASS_C_DEC* >(this)->get_cmp_fn();

  size_type ord = 0;

  while (it != end_it)

    {

      const_node_iterator l_it = it.get_l_child();

      if (r_cmp_fn(r_key, extract_key(*(*it))))

        it = l_it;

      else if (r_cmp_fn(extract_key(*(*it)), r_key))

        {

          ord += (l_it == end_it)?

            1 :

            1 + l_it.get_metadata();

          it = it.get_r_child();

        }

      else

        {

          ord += (l_it == end_it)?

            l_it.get_metadata();

          it = end_it;

        }

    }

  return (ord);

}

PB_DS_CLASS_T_DEC

inline void

PB_DS_CLASS_C_DEC::

operator()(node_iterator node_it, const_node_iterator end_nd_it) const

{

  node_iterator l_child_it = node_it.get_l_child();

  const size_type l_rank =(l_child_it == end_nd_it)? 0 : l_child_it.get_metadata();

  node_iterator r_child_it = node_it.get_r_child();

  const size_type r_rank =(r_child_it == end_nd_it)? 0 : r_child_it.get_metadata();

  const_cast<metadata_reference>(node_it.get_metadata())=

    1 + l_rank + r_rank;

}

PB_DS_CLASS_T_DEC

PB_DS_CLASS_C_DEC::

~tree_order_statistics_node_update()

{ }