libstdc++
bin_search_tree_/erase_fn_imps.hpp
Go to the documentation of this file.
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 bin_search_tree_/erase_fn_imps.hpp
00038  * Contains an implementation class for bin_search_tree_.
00039  */
00040 
00041 PB_DS_CLASS_T_DEC
00042 inline void
00043 PB_DS_CLASS_C_DEC::
00044 actual_erase_node(node_pointer p_z)
00045 {
00046   _GLIBCXX_DEBUG_ASSERT(m_size > 0);
00047   --m_size;
00048   _GLIBCXX_DEBUG_ONLY(debug_base::erase_existing(PB_DS_V2F(p_z->m_value));)
00049   p_z->~node();
00050   s_node_allocator.deallocate(p_z, 1);
00051 }
00052 
00053 PB_DS_CLASS_T_DEC
00054 inline void
00055 PB_DS_CLASS_C_DEC::
00056 update_min_max_for_erased_node(node_pointer p_z)
00057 {
00058   if (m_size == 1)
00059     {
00060       m_p_head->m_p_left = m_p_head->m_p_right = m_p_head;
00061       return;
00062     }
00063 
00064   if (m_p_head->m_p_left == p_z)
00065     {
00066       iterator it(p_z);
00067       ++it;
00068       m_p_head->m_p_left = it.m_p_nd;
00069     }
00070   else if (m_p_head->m_p_right == p_z)
00071     {
00072       iterator it(p_z);
00073       --it;
00074       m_p_head->m_p_right = it.m_p_nd;
00075     }
00076 }
00077 
00078 PB_DS_CLASS_T_DEC
00079 void
00080 PB_DS_CLASS_C_DEC::
00081 clear()
00082 {
00083   PB_DS_STRUCT_ONLY_ASSERT_VALID((*this))
00084   clear_imp(m_p_head->m_p_parent);
00085   m_size = 0;
00086   initialize();
00087   _GLIBCXX_DEBUG_ONLY(debug_base::clear();)
00088   PB_DS_STRUCT_ONLY_ASSERT_VALID((*this))
00089 }
00090 
00091 PB_DS_CLASS_T_DEC
00092 void
00093 PB_DS_CLASS_C_DEC::
00094 clear_imp(node_pointer p_nd)
00095 {
00096   if (p_nd == 0)
00097     return;
00098 
00099   clear_imp(p_nd->m_p_left);
00100   clear_imp(p_nd->m_p_right);
00101   p_nd->~node();
00102   s_node_allocator.deallocate(p_nd, 1);
00103 }