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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 split_join_fn_imps.hpp

 * Contains an implementation class for ov_tree_.

 */

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

split(const_key_reference r_key, PB_DS_CLASS_C_DEC& other)

{

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

  _GLIBCXX_DEBUG_ONLY(other.assert_valid();)

  if (m_size == 0)

    {

      other.clear();

      _GLIBCXX_DEBUG_ONLY(assert_valid();)

      _GLIBCXX_DEBUG_ONLY(other.assert_valid();)

      return;

    }

  if (Cmp_Fn::operator()(r_key, PB_DS_V2F(*begin())))

    {

      value_swap(other);

      _GLIBCXX_DEBUG_ONLY(assert_valid();)

      _GLIBCXX_DEBUG_ONLY(other.assert_valid();)

      return;

    }

  if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(*(end() - 1))))

    {

      _GLIBCXX_DEBUG_ONLY(assert_valid();)

      _GLIBCXX_DEBUG_ONLY(other.assert_valid();)

      return;

    }

  if (m_size == 1)

    {

      value_swap(other);

      _GLIBCXX_DEBUG_ONLY(assert_valid();)

      _GLIBCXX_DEBUG_ONLY(other.assert_valid();)

      return;

    }

  _GLIBCXX_DEBUG_ONLY(debug_base::join(other);)

  iterator it = upper_bound(r_key);

  PB_DS_CLASS_C_DEC new_other(other, other);

  new_other.copy_from_ordered_range(it, end());

  PB_DS_CLASS_C_DEC new_this(*this, * this);

  new_this.copy_from_ordered_range(begin(), it);

  // No exceptions from this point.

  _GLIBCXX_DEBUG_ONLY(debug_base::split(r_key,(Cmp_Fn& )(*this), other);)

  other.update(other.node_begin(), (node_update* )(&other));

  update(node_begin(), (node_update* )this);

  other.value_swap(new_other);

  value_swap(new_this);

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

  _GLIBCXX_DEBUG_ONLY(other.assert_valid();)

}

PB_DS_CLASS_T_DEC

void

PB_DS_CLASS_C_DEC::

join(PB_DS_CLASS_C_DEC& other)

{

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

  _GLIBCXX_DEBUG_ONLY(other.assert_valid();)

  if (other.m_size == 0)

    return;

  if (m_size == 0)

    {

      value_swap(other);

      return;

    }

  const bool greater = Cmp_Fn::operator()(PB_DS_V2F(*(end() - 1)),

                                          PB_DS_V2F(*other.begin()));

  const bool lesser = Cmp_Fn::operator()(PB_DS_V2F(*(other.end() - 1)),

                                         PB_DS_V2F(*begin()));

  if (!greater && !lesser)

    __throw_join_error();

  PB_DS_CLASS_C_DEC new_this(*this, *this);

  if (greater)

    new_this.copy_from_ordered_range(begin(), end(),

                                     other.begin(), other.end());

  else

    new_this.copy_from_ordered_range(other.begin(), other.end(),

                                     begin(), end());

  // No exceptions from this point.

  _GLIBCXX_DEBUG_ONLY(debug_base::join(other);)

  value_swap(new_this);

  other.clear();

  _GLIBCXX_DEBUG_ONLY(assert_valid();)

  _GLIBCXX_DEBUG_ONLY(other.assert_valid();)

}