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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 const_child_iterator.hpp

 * Contains a const_iterator for a patricia tree.

 */

struct const_iterator

{

public:

  typedef std::forward_iterator_tag iterator_category;

  typedef typename Allocator::difference_type difference_type;

  typedef node_pointer value_type;

  typedef node_pointer_pointer pointer;

  typedef node_pointer_reference reference;

public:

  inline

  const_iterator(node_pointer_pointer p_p_cur = NULL,

                 node_pointer_pointer p_p_end = NULL)

  : m_p_p_cur(p_p_cur), m_p_p_end(p_p_end)

  { }

  inline bool

  operator==(const const_iterator& other) const

  { return m_p_p_cur == other.m_p_p_cur; }

  inline bool

  operator!=(const const_iterator& other) const

  { return m_p_p_cur != other.m_p_p_cur; }

  inline const_iterator&

  operator++()

  {

    do

      ++m_p_p_cur;

    while (m_p_p_cur != m_p_p_end&& * m_p_p_cur == NULL);

    return *this;

  }

  inline const_iterator

  operator++(int)

  {

    const_iterator ret_it(*this);

    operator++();

    return ret_it;

  }

  const node_pointer_pointer

  operator->() const

  {

    _GLIBCXX_DEBUG_ONLY(assert_referencible();)

    return (m_p_p_cur);

  }

  const_node_pointer

  operator*() const

  {

    _GLIBCXX_DEBUG_ONLY(assert_referencible();)

    return (*m_p_p_cur);

  }

protected:

#ifdef _GLIBCXX_DEBUG

  void

  assert_referencible() const

  { _GLIBCXX_DEBUG_ASSERT(m_p_p_cur != m_p_p_end&& * m_p_p_cur != NULL); }

#endif 

public:

  node_pointer_pointer m_p_p_cur;

  node_pointer_pointer m_p_p_end;

};