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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 insert_fn_imps.hpp

 * Contains an implementation class for a base of binomial heaps.

 */

PB_DS_CLASS_T_DEC

inline typename PB_DS_CLASS_C_DEC::point_iterator

PB_DS_CLASS_C_DEC::

push(const_reference r_val)

{

  _GLIBCXX_DEBUG_ONLY(assert_valid(true);)

    node_pointer p_nd = base_type::get_new_node_for_insert(r_val);

  insert_node(p_nd);

  m_p_max = NULL;

  _GLIBCXX_DEBUG_ONLY(assert_valid(true);)

    return point_iterator(p_nd);

}

PB_DS_CLASS_T_DEC

inline void

PB_DS_CLASS_C_DEC::

insert_node(node_pointer p_nd)

{

  if (base_type::m_p_root == NULL)

    {

      p_nd->m_p_next_sibling = p_nd->m_p_prev_or_parent =

        p_nd->m_p_l_child = NULL;

      p_nd->m_metadata = 0;

      base_type::m_p_root = p_nd;

      return;

    }

  if (base_type::m_p_root->m_metadata > 0)

    {

      p_nd->m_p_prev_or_parent = p_nd->m_p_l_child = NULL;

      p_nd->m_p_next_sibling = base_type::m_p_root;

      base_type::m_p_root->m_p_prev_or_parent = p_nd;

      base_type::m_p_root = p_nd;

      p_nd->m_metadata = 0;

      return;

    }

  if (Cmp_Fn::operator()(base_type::m_p_root->m_value, p_nd->m_value))

    {

      p_nd->m_p_next_sibling = base_type::m_p_root->m_p_next_sibling;

      p_nd->m_p_prev_or_parent = NULL;

      p_nd->m_metadata = 1;

      p_nd->m_p_l_child = base_type::m_p_root;

      base_type::m_p_root->m_p_prev_or_parent = p_nd;

      base_type::m_p_root->m_p_next_sibling = NULL;

      base_type::m_p_root = p_nd;

    }

  else

    {

      p_nd->m_p_next_sibling = NULL;

      p_nd->m_p_l_child = NULL;

      p_nd->m_p_prev_or_parent = base_type::m_p_root;

      p_nd->m_metadata = 0;

      _GLIBCXX_DEBUG_ASSERT(base_type::m_p_root->m_p_l_child == 0);

      base_type::m_p_root->m_p_l_child = p_nd;

      base_type::m_p_root->m_metadata = 1;

    }

  base_type::m_p_root = fix(base_type::m_p_root);

}

PB_DS_CLASS_T_DEC

inline typename PB_DS_CLASS_C_DEC::node_pointer

PB_DS_CLASS_C_DEC::

fix(node_pointer p_nd) const

{

  while (p_nd->m_p_next_sibling != NULL&&

         p_nd->m_metadata == p_nd->m_p_next_sibling->m_metadata)

    {

      node_pointer p_next = p_nd->m_p_next_sibling;

      if (Cmp_Fn::operator()(p_nd->m_value, p_next->m_value))

        {

          p_next->m_p_prev_or_parent =

            p_nd->m_p_prev_or_parent;

          if (p_nd->m_p_prev_or_parent != NULL)

            p_nd->m_p_prev_or_parent->m_p_next_sibling = p_next;

          base_type::make_child_of(p_nd, p_next);

          ++p_next->m_metadata;

          p_nd = p_next;

        }

      else

        {

          p_nd->m_p_next_sibling = p_next->m_p_next_sibling;

          if (p_nd->m_p_next_sibling != NULL)

            p_next->m_p_next_sibling = NULL;

          base_type::make_child_of(p_next, p_nd);

          ++p_nd->m_metadata;

        }

    }

  if (p_nd->m_p_next_sibling != NULL)

    p_nd->m_p_next_sibling->m_p_prev_or_parent = p_nd;

  return p_nd;

}

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

modify(point_iterator it, const_reference r_new_val)

{

  _GLIBCXX_DEBUG_ONLY(assert_valid(true);)

    node_pointer p_nd = it.m_p_nd;

  _GLIBCXX_DEBUG_ASSERT(p_nd != NULL);

  _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd, false);)

    const bool bubble_up = Cmp_Fn::operator()(p_nd->m_value, r_new_val);

  p_nd->m_value = r_new_val;

  if (bubble_up)

    {

      node_pointer p_parent = base_type::parent(p_nd);

      while (p_parent != NULL&&

             Cmp_Fn::operator()(p_parent->m_value, p_nd->m_value))

        {

          base_type::swap_with_parent(p_nd, p_parent);

          p_parent = base_type::parent(p_nd);

        }

      if (p_nd->m_p_prev_or_parent == NULL)

        base_type::m_p_root = p_nd;

      m_p_max = NULL;

      _GLIBCXX_DEBUG_ONLY(assert_valid(true);)

        return;

    }

  base_type::bubble_to_top(p_nd);

  remove_parentless_node(p_nd);

  insert_node(p_nd);

  m_p_max = NULL;

  _GLIBCXX_DEBUG_ONLY(assert_valid(true);)

    }