split_join_fn_imps.hpp

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// -*- C++ -*-

// Copyright (C) 2005 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 2, 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.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

// 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 splay_tree_.
 */

PB_ASSOC_CLASS_T_DEC
inline void
PB_ASSOC_CLASS_C_DEC::
join(PB_ASSOC_CLASS_C_DEC& r_other)
{
  PB_ASSOC_DBG_ONLY(PB_ASSOC_CLASS_C_DEC::assert_valid();)
    PB_ASSOC_DBG_ONLY(r_other.PB_ASSOC_CLASS_C_DEC::assert_valid();)

    if (PB_ASSOC_BASE_C_DEC::join_prep(r_other) == false)
      {
	PB_ASSOC_DBG_ONLY(PB_ASSOC_CLASS_C_DEC::assert_valid();)
	  PB_ASSOC_DBG_ONLY(r_other.PB_ASSOC_CLASS_C_DEC::assert_valid();)

	  return;
      }

  node_pointer p_target_r = r_other.leftmost(r_other.m_p_head);

  PB_ASSOC_DBG_ASSERT(p_target_r != NULL);

  r_other.splay(p_target_r);

  PB_ASSOC_DBG_ASSERT(p_target_r == r_other.m_p_head->m_p_parent);
  PB_ASSOC_DBG_ASSERT(p_target_r->m_p_left == NULL);

  p_target_r->m_p_left = PB_ASSOC_BASE_C_DEC::m_p_head->m_p_parent;

  PB_ASSOC_DBG_ASSERT(p_target_r->m_p_left != NULL);
  p_target_r->m_p_left->m_p_parent = p_target_r;

  PB_ASSOC_BASE_C_DEC::m_p_head->m_p_parent = p_target_r;
  p_target_r->m_p_parent = PB_ASSOC_BASE_C_DEC::m_p_head;

  apply_update(p_target_r, (Node_Updator* )this);

  PB_ASSOC_BASE_C_DEC::join_finish(r_other);

  PB_ASSOC_DBG_ONLY(PB_ASSOC_CLASS_C_DEC::assert_valid();)
    PB_ASSOC_DBG_ONLY(r_other.PB_ASSOC_CLASS_C_DEC::assert_valid();)
    }

PB_ASSOC_CLASS_T_DEC
void
PB_ASSOC_CLASS_C_DEC::
split(const_key_reference r_key, PB_ASSOC_CLASS_C_DEC& r_other)
{
  PB_ASSOC_DBG_ONLY(PB_ASSOC_CLASS_C_DEC::assert_valid());
  PB_ASSOC_DBG_ONLY(r_other.PB_ASSOC_CLASS_C_DEC::assert_valid());

  if (PB_ASSOC_BASE_C_DEC::split_prep(r_key, r_other) == false)
    {
      PB_ASSOC_DBG_ONLY(PB_ASSOC_CLASS_C_DEC::assert_valid());
      PB_ASSOC_DBG_ONLY(r_other.PB_ASSOC_CLASS_C_DEC::assert_valid());

      return;
    }

  node_pointer p_upper_bound = upper_bound(r_key).m_p_nd;
  PB_ASSOC_DBG_ASSERT(p_upper_bound != NULL);

  PB_ASSOC_DBG_ASSERT(p_upper_bound->m_p_parent ==
		      PB_ASSOC_BASE_C_DEC::m_p_head);

  node_pointer p_new_root = p_upper_bound->m_p_left;
  PB_ASSOC_DBG_ASSERT(p_new_root != NULL);

  PB_ASSOC_BASE_C_DEC::m_p_head->m_p_parent = p_new_root;
  p_new_root->m_p_parent = PB_ASSOC_BASE_C_DEC::m_p_head;

  r_other.m_p_head->m_p_parent = p_upper_bound;
  p_upper_bound->m_p_parent = r_other.m_p_head;
  p_upper_bound->m_p_left = NULL;

  apply_update(p_upper_bound, (Node_Updator* )this);

  PB_ASSOC_BASE_C_DEC::split_finish(r_other);

  PB_ASSOC_DBG_ONLY(PB_ASSOC_CLASS_C_DEC::assert_valid());
  PB_ASSOC_DBG_ONLY(r_other.PB_ASSOC_CLASS_C_DEC::assert_valid());
}