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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009, 2010, 2011 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 pairing_heap_/split_join_fn_imps.hpp

 * Contains an implementation class for a pairing heap.

 */

PB_DS_CLASS_T_DEC

template<typename Pred>

void

PB_DS_CLASS_C_DEC::

split(Pred pred, PB_DS_CLASS_C_DEC& other)

{

  PB_DS_ASSERT_VALID((*this))

  PB_DS_ASSERT_VALID(other)

  other.clear();

  if (base_type::empty())

    {

      PB_DS_ASSERT_VALID((*this))

      PB_DS_ASSERT_VALID(other)

      return;

    }

  base_type::to_linked_list();

  node_pointer p_out = base_type::prune(pred);

  while (p_out != 0)

    {

      _GLIBCXX_DEBUG_ASSERT(base_type::m_size > 0);

      --base_type::m_size;

      ++other.m_size;

      node_pointer p_next = p_out->m_p_next_sibling;

      p_out->m_p_l_child = p_out->m_p_next_sibling = p_out->m_p_prev_or_parent = 0;

      other.push_imp(p_out);

      p_out = p_next;

    }

  PB_DS_ASSERT_VALID(other)

  node_pointer p_cur = base_type::m_p_root;

  base_type::m_p_root = 0;

  while (p_cur != 0)

    {

      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 = 0;

      push_imp(p_cur);

      p_cur = p_next;

    }

  PB_DS_ASSERT_VALID((*this))

  PB_DS_ASSERT_VALID(other)

}

PB_DS_CLASS_T_DEC

inline void

PB_DS_CLASS_C_DEC::

join(PB_DS_CLASS_C_DEC& other)

{

  PB_DS_ASSERT_VALID((*this))

  PB_DS_ASSERT_VALID(other)

  if (other.m_p_root == 0)

    {

      PB_DS_ASSERT_VALID((*this))

      PB_DS_ASSERT_VALID(other)

      return;

    }

  if (base_type::m_p_root == 0)

    base_type::m_p_root = other.m_p_root;

  else if (Cmp_Fn::operator()(base_type::m_p_root->m_value, other.m_p_root->m_value))

    {

      base_type::make_child_of(base_type::m_p_root, other.m_p_root);

      PB_DS_ASSERT_NODE_CONSISTENT(other.m_p_root, false)

      base_type::m_p_root = other.m_p_root;

    }

  else

    {

      base_type::make_child_of(other.m_p_root, base_type::m_p_root);

      PB_DS_ASSERT_NODE_CONSISTENT(base_type::m_p_root, false)

    }

  base_type::m_size += other.m_size;

  other.m_p_root = 0;

  other.m_size = 0;

  PB_DS_ASSERT_VALID((*this))

  PB_DS_ASSERT_VALID(other)

}