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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 erase_fn_imps.hpp

 * Contains an implementation class for a pairing heap.

 */

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

pop()

{

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

  _GLIBCXX_DEBUG_ASSERT(!base_type::empty());

  node_pointer p_new_root = join_node_children(base_type::m_p_root);

  _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_new_root, false);)

  if (p_new_root != NULL)

    p_new_root->m_p_prev_or_parent = NULL;

  base_type::actual_erase_node(base_type::m_p_root);

  base_type::m_p_root = p_new_root;

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

}

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

erase(point_iterator it)

{

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

  _GLIBCXX_DEBUG_ASSERT(!base_type::empty());

  remove_node(it.m_p_nd);

  base_type::actual_erase_node(it.m_p_nd);

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

}

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

remove_node(node_pointer p_nd)

{

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

  _GLIBCXX_DEBUG_ASSERT(!base_type::empty());

  node_pointer p_new_child = join_node_children(p_nd);

#ifdef _GLIBCXX_DEBUG

  if (p_new_child != NULL)

    base_type::assert_node_consistent(p_new_child, false);

#endif 

  if (p_nd == base_type::m_p_root)

    {

      if (p_new_child != NULL)

        p_new_child->m_p_prev_or_parent = NULL;

      base_type::m_p_root = p_new_child;

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

      return;

    }

  _GLIBCXX_DEBUG_ASSERT(p_nd->m_p_prev_or_parent != NULL);

  if (p_nd->m_p_prev_or_parent->m_p_l_child == p_nd)

    {

      if (p_new_child != NULL)

        {

          p_new_child->m_p_prev_or_parent = p_nd->m_p_prev_or_parent;

          p_new_child->m_p_next_sibling = p_nd->m_p_next_sibling;

          if (p_new_child->m_p_next_sibling != NULL)

            p_new_child->m_p_next_sibling->m_p_prev_or_parent = p_new_child;

          p_nd->m_p_prev_or_parent->m_p_l_child = p_new_child;

          _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd->m_p_prev_or_parent, false);)

          return;

        }

      p_nd->m_p_prev_or_parent->m_p_l_child = p_nd->m_p_next_sibling;

      if (p_nd->m_p_next_sibling != NULL)

        p_nd->m_p_next_sibling->m_p_prev_or_parent = p_nd->m_p_prev_or_parent;

      _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd->m_p_prev_or_parent, false);)

      return;

    }

  if (p_new_child != NULL)

    {

      p_new_child->m_p_prev_or_parent = p_nd->m_p_prev_or_parent;

      p_new_child->m_p_next_sibling = p_nd->m_p_next_sibling;

      if (p_new_child->m_p_next_sibling != NULL)

        p_new_child->m_p_next_sibling->m_p_prev_or_parent = p_new_child;

      p_new_child->m_p_prev_or_parent->m_p_next_sibling = p_new_child;

      _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd->m_p_prev_or_parent, false);)

      return;

    }

  p_nd->m_p_prev_or_parent->m_p_next_sibling = p_nd->m_p_next_sibling;

  if (p_nd->m_p_next_sibling != NULL)

    p_nd->m_p_next_sibling->m_p_prev_or_parent = p_nd->m_p_prev_or_parent;

  _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd->m_p_prev_or_parent, false);)

}

PB_DS_CLASS_T_DEC

typename PB_DS_CLASS_C_DEC::node_pointer

PB_DS_CLASS_C_DEC::

join_node_children(node_pointer p_nd)

{

  _GLIBCXX_DEBUG_ASSERT(p_nd != NULL);

  node_pointer p_ret = p_nd->m_p_l_child;

  if (p_ret == NULL)

    return NULL;

  while (p_ret->m_p_next_sibling != NULL)

    p_ret = forward_join(p_ret, p_ret->m_p_next_sibling);

  while (p_ret->m_p_prev_or_parent != p_nd)

    p_ret = back_join(p_ret->m_p_prev_or_parent, p_ret);

  _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_ret, false);)

  return p_ret;

}

PB_DS_CLASS_T_DEC

typename PB_DS_CLASS_C_DEC::node_pointer

PB_DS_CLASS_C_DEC::

forward_join(node_pointer p_nd, node_pointer p_next)

{

  _GLIBCXX_DEBUG_ASSERT(p_nd != NULL);

  _GLIBCXX_DEBUG_ASSERT(p_nd->m_p_next_sibling == p_next);

  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;

      base_type::make_child_of(p_nd, p_next);

      return p_next->m_p_next_sibling == NULL

        ? p_next : p_next->m_p_next_sibling;

    }

  if (p_next->m_p_next_sibling != NULL)

    {

      p_next->m_p_next_sibling->m_p_prev_or_parent = p_nd;

      p_nd->m_p_next_sibling = p_next->m_p_next_sibling;

      base_type::make_child_of(p_next, p_nd);

      return p_nd->m_p_next_sibling;

    }

  p_nd->m_p_next_sibling = NULL;

  base_type::make_child_of(p_next, p_nd);

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

  return p_nd;

}

PB_DS_CLASS_T_DEC

typename PB_DS_CLASS_C_DEC::node_pointer

PB_DS_CLASS_C_DEC::

back_join(node_pointer p_nd, node_pointer p_next)

{

  _GLIBCXX_DEBUG_ASSERT(p_nd != NULL);

  _GLIBCXX_DEBUG_ASSERT(p_next->m_p_next_sibling == NULL);

  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;

      base_type::make_child_of(p_nd, p_next);

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

      return p_next;

    }

  p_nd->m_p_next_sibling = NULL;

  base_type::make_child_of(p_next, p_nd);

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

  return p_nd;

}

PB_DS_CLASS_T_DEC

template<typename Pred>

typename PB_DS_CLASS_C_DEC::size_type

PB_DS_CLASS_C_DEC::

erase_if(Pred pred)

{

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

    if (base_type::empty())

      {

        _GLIBCXX_DEBUG_ONLY(assert_valid();)

        return 0;

      }

  base_type::to_linked_list();

  node_pointer p_out = base_type::prune(pred);

  size_type ersd = 0;

  while (p_out != NULL)

    {

      ++ersd;

      node_pointer p_next = p_out->m_p_next_sibling;

      base_type::actual_erase_node(p_out);

      p_out = p_next;

    }

  node_pointer p_cur = base_type::m_p_root;

  base_type::m_p_root = NULL;

  while (p_cur != NULL)

    {

      node_pointer p_next = p_cur->m_p_next_sibling;

      p_cur->m_p_l_child = p_cur->m_p_next_sibling = p_cur->m_p_prev_or_parent = NULL;

      push_imp(p_cur);

      p_cur = p_next;

    }

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

  return ersd;

}