libstdc++
splay_tree_/split_join_fn_imps.hpp
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00001 // -*- C++ -*-
00002 
00003 // Copyright (C) 2005, 2006, 2009, 2010, 2011 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the terms
00007 // of the GNU General Public License as published by the Free Software
00008 // Foundation; either version 3, or (at your option) any later
00009 // version.
00010 
00011 // This library is distributed in the hope that it will be useful, but
00012 // WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014 // General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
00026 
00027 // Permission to use, copy, modify, sell, and distribute this software
00028 // is hereby granted without fee, provided that the above copyright
00029 // notice appears in all copies, and that both that copyright notice
00030 // and this permission notice appear in supporting documentation. None
00031 // of the above authors, nor IBM Haifa Research Laboratories, make any
00032 // representation about the suitability of this software for any
00033 // purpose. It is provided "as is" without express or implied
00034 // warranty.
00035 
00036 /**
00037  * @file splay_tree_/split_join_fn_imps.hpp
00038  * Contains an implementation class for splay_tree_.
00039  */
00040 
00041 PB_DS_CLASS_T_DEC
00042 inline void
00043 PB_DS_CLASS_C_DEC::
00044 join(PB_DS_CLASS_C_DEC& other)
00045 {
00046   PB_DS_ASSERT_VALID((*this))
00047   PB_DS_ASSERT_VALID(other)
00048   if (base_type::join_prep(other) == false)
00049     {
00050       PB_DS_ASSERT_VALID((*this))
00051       PB_DS_ASSERT_VALID(other)
00052       return;
00053     }
00054 
00055   node_pointer p_target_r = other.leftmost(other.m_p_head);
00056   _GLIBCXX_DEBUG_ASSERT(p_target_r != 0);
00057   other.splay(p_target_r);
00058 
00059   _GLIBCXX_DEBUG_ASSERT(p_target_r == other.m_p_head->m_p_parent);
00060   _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left == 0);
00061 
00062   p_target_r->m_p_left = base_type::m_p_head->m_p_parent;
00063 
00064   _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left != 0);
00065   p_target_r->m_p_left->m_p_parent = p_target_r;
00066 
00067   base_type::m_p_head->m_p_parent = p_target_r;
00068   p_target_r->m_p_parent = base_type::m_p_head;
00069 
00070   this->apply_update(p_target_r, (node_update*)this);
00071   base_type::join_finish(other);
00072 
00073   PB_DS_ASSERT_VALID((*this))
00074   PB_DS_ASSERT_VALID(other)
00075 }
00076 
00077 PB_DS_CLASS_T_DEC
00078 void
00079 PB_DS_CLASS_C_DEC::
00080 split(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
00081 {
00082   PB_DS_ASSERT_VALID((*this))
00083   PB_DS_ASSERT_VALID(other)
00084 
00085   if (base_type::split_prep(r_key, other) == false)
00086     {
00087       PB_DS_ASSERT_VALID((*this))
00088       PB_DS_ASSERT_VALID(other)
00089       return;
00090     }
00091 
00092   node_pointer p_upper_bound = this->upper_bound(r_key).m_p_nd;
00093   _GLIBCXX_DEBUG_ASSERT(p_upper_bound != 0);
00094 
00095   splay(p_upper_bound);
00096   _GLIBCXX_DEBUG_ASSERT(p_upper_bound->m_p_parent == this->m_p_head);
00097 
00098   node_pointer p_new_root = p_upper_bound->m_p_left;
00099   _GLIBCXX_DEBUG_ASSERT(p_new_root != 0);
00100 
00101   base_type::m_p_head->m_p_parent = p_new_root;
00102   p_new_root->m_p_parent = base_type::m_p_head;
00103   other.m_p_head->m_p_parent = p_upper_bound;
00104   p_upper_bound->m_p_parent = other.m_p_head;
00105   p_upper_bound->m_p_left = 0;
00106   this->apply_update(p_upper_bound, (node_update*)this);
00107   base_type::split_finish(other);
00108 
00109   PB_DS_ASSERT_VALID((*this))
00110   PB_DS_ASSERT_VALID(other)
00111 }
00112