mingw/lib/gcc/mingw32/4.3.3/include/c++/ext/pb_ds/detail/splay_tree_/erase_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the terms
   7 // of the GNU General Public License as published by the Free Software
   8 // Foundation; either version 2, or (at your option) any later
   9 // version.
  10
  11 // This library is distributed in the hope that it will be useful, but
  12 // WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 // General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License
  17 // along with this library; see the file COPYING.  If not, write to
  18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  19 // MA 02111-1307, USA.
  20
  21 // As a special exception, you may use this file as part of a free
  22 // software library without restriction.  Specifically, if other files
  23 // instantiate templates or use macros or inline functions from this
  24 // file, or you compile this file and link it with other files to
  25 // produce an executable, this file does not by itself cause the
  26 // resulting executable to be covered by the GNU General Public
  27 // License.  This exception does not however invalidate any other
  28 // reasons why the executable file might be covered by the GNU General
  29 // Public License.
  30
  31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  32
  33 // Permission to use, copy, modify, sell, and distribute this software
  34 // is hereby granted without fee, provided that the above copyright
  35 // notice appears in all copies, and that both that copyright notice
  36 // and this permission notice appear in supporting documentation. None
  37 // of the above authors, nor IBM Haifa Research Laboratories, make any
  38 // representation about the suitability of this software for any
  39 // purpose. It is provided "as is" without express or implied
  40 // warranty.
  41
  42 /**
  43  * @file erase_fn_imps.hpp
  44  * Contains an implementation class for splay_tree_.
  45  */
  46
  47 PB_DS_CLASS_T_DEC
  48 inline bool
  49 PB_DS_CLASS_C_DEC::
  50 erase(const_key_reference r_key)
  51 {
  52   point_iterator it = find(r_key);
  53   if (it == base_type::end())
  54     return false;
  55   erase(it);
  56   return true;
  57 }
  58
  59 PB_DS_CLASS_T_DEC
  60 inline typename PB_DS_CLASS_C_DEC::iterator
  61 PB_DS_CLASS_C_DEC::
  62 erase(iterator it)
  63 {
  64   _GLIBCXX_DEBUG_ONLY(assert_valid());
  65   if (it == base_type::end())
  66     return it;
  67   iterator ret_it = it;
  68   ++ret_it;
  69   erase_node(it.m_p_nd);
  70   _GLIBCXX_DEBUG_ONLY(assert_valid());
  71   return ret_it;
  72 }
  73
  74 PB_DS_CLASS_T_DEC
  75 inline typename PB_DS_CLASS_C_DEC::reverse_iterator
  76 PB_DS_CLASS_C_DEC::
  77 erase(reverse_iterator it)
  78 {
  79   _GLIBCXX_DEBUG_ONLY(assert_valid());
  80   if (it.m_p_nd == base_type::m_p_head)
  81     return (it);
  82   reverse_iterator ret_it = it;
  83   ++ret_it;
  84   erase_node(it.m_p_nd);
  85   _GLIBCXX_DEBUG_ONLY(assert_valid());
  86   return ret_it;
  87 }
  88
  89 PB_DS_CLASS_T_DEC
  90 template<typename Pred>
  91 inline typename PB_DS_CLASS_C_DEC::size_type
  92 PB_DS_CLASS_C_DEC::
  93 erase_if(Pred pred)
  94 {
  95   _GLIBCXX_DEBUG_ONLY(assert_valid();)
  96   size_type num_ersd = 0;
  97   iterator it = base_type::begin();
  98   while (it != base_type::end())
  99     {
 100       if (pred(*it))
 101         {
 102           ++num_ersd;
 103           it = erase(it);
 104         }
 105       else
 106         ++it;
 107     }
 108   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 109   return num_ersd;
 110 }
 111
 112 PB_DS_CLASS_T_DEC
 113 void
 114 PB_DS_CLASS_C_DEC::
 115 erase_node(node_pointer p_nd)
 116 {
 117   _GLIBCXX_DEBUG_ASSERT(p_nd != NULL);
 118   splay(p_nd);
 119
 120   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 121   _GLIBCXX_DEBUG_ASSERT(p_nd == this->m_p_head->m_p_parent);
 122
 123   node_pointer p_l = p_nd->m_p_left;
 124   node_pointer p_r = p_nd->m_p_right;
 125
 126   base_type::update_min_max_for_erased_node(p_nd);
 127   base_type::actual_erase_node(p_nd);
 128   if (p_r == NULL)
 129     {
 130       base_type::m_p_head->m_p_parent = p_l;
 131       if (p_l != NULL)
 132         p_l->m_p_parent = base_type::m_p_head;
 133       _GLIBCXX_DEBUG_ONLY(assert_valid();)
 134       return;
 135     }
 136
 137   node_pointer p_target_r = leftmost(p_r);
 138   _GLIBCXX_DEBUG_ASSERT(p_target_r != NULL);
 139   p_r->m_p_parent = base_type::m_p_head;
 140   base_type::m_p_head->m_p_parent = p_r;
 141   splay(p_target_r);
 142
 143   _GLIBCXX_DEBUG_ONLY(p_target_r->m_p_left = NULL);
 144   _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_parent == this->m_p_head);
 145   _GLIBCXX_DEBUG_ASSERT(this->m_p_head->m_p_parent == p_target_r);
 146
 147   p_target_r->m_p_left = p_l;
 148   if (p_l != NULL)
 149     p_l->m_p_parent = p_target_r;
 150   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 151   apply_update(p_target_r, (node_update* )this);
 152 }
 153
 154 PB_DS_CLASS_T_DEC
 155 inline typename PB_DS_CLASS_C_DEC::node_pointer
 156 PB_DS_CLASS_C_DEC::
 157 leftmost(node_pointer p_nd)
 158 {
 159   _GLIBCXX_DEBUG_ASSERT(p_nd != NULL);
 160   while (p_nd->m_p_left != NULL)
 161     p_nd = p_nd->m_p_left;
 162   return p_nd;
 163 }