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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 node_iterators.hpp

 * Contains an implementation class for bin_search_tree_.

 */

class const_node_it_

{

public:

  typedef trivial_iterator_tag iterator_category;

  typedef trivial_iterator_difference_type difference_type;

  typedef const_iterator value_type;

  typedef const_iterator*  pointer;

  typedef const_iterator*  const_pointer;

  typedef const_iterator&  reference;

  typedef const iterator&  const_reference;

public:

  inline

  const_node_it_(const node_pointer p_nd = NULL)

    : m_p_nd(const_cast<node_pointer>(p_nd))

  { }

  inline const_iterator

  operator*() const

  {

    return (const_iterator(m_p_nd));

  }

  inline const_node_it_

  l_child() const

  {

    return (const_node_it_(m_p_nd->m_p_left));

  }

  inline const_node_it_

  r_child() const

  {

    return (const_node_it_(m_p_nd->m_p_right));

  }

  inline bool

  operator==(const const_node_it_& r_other) const

  {

    return (m_p_nd == r_other.m_p_nd);

  }

  inline bool

  operator!=(const const_node_it_& r_other) const

  {

    return (m_p_nd != r_other.m_p_nd);

  }

private:

  friend class PB_ASSOC_CLASS_C_DEC;

public:

  node_pointer m_p_nd;

};

class node_it_ :

  public const_node_it_

{

public:

  inline

  node_it_(const node_pointer p_nd = NULL)

    : const_node_it_(const_cast<node_pointer>(p_nd))

  { }

  inline iterator

  operator*() const

  {

    return (iterator(const_node_it_::m_p_nd));

  }

  inline node_it_

  l_child()

  {

    return (node_it_(const_node_it_::m_p_nd->m_p_left));

  }

  inline node_it_

  r_child()

  {

    return (node_it_(const_node_it_::m_p_nd->m_p_right));

  }

private:

  friend class PB_ASSOC_CLASS_C_DEC;

};