mingw/lib/gcc/mingw32/4.3.3/include/c++/ext/pb_ds/detail/splay_tree_/splay_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 splay_fn_imps.hpp
  44  * Contains an implementation class for splay_tree_.
  45  */
  46
  47 PB_DS_CLASS_T_DEC
  48 void
  49 PB_DS_CLASS_C_DEC::
  50 splay(node_pointer p_nd)
  51 {
  52   while (p_nd->m_p_parent != base_type::m_p_head)
  53     {
  54 #ifdef _GLIBCXX_DEBUG
  55       {
  56         node_pointer p_head = base_type::m_p_head;
  57         assert_special_imp(p_head);
  58       }
  59 #endif
  60
  61       _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd);)
  62
  63         if (p_nd->m_p_parent->m_p_parent == base_type::m_p_head)
  64           {
  65             base_type::rotate_parent(p_nd);
  66             _GLIBCXX_DEBUG_ASSERT(p_nd == this->m_p_head->m_p_parent);
  67           }
  68         else
  69           {
  70             const node_pointer p_parent = p_nd->m_p_parent;
  71             const node_pointer p_grandparent = p_parent->m_p_parent;
  72
  73 #ifdef _GLIBCXX_DEBUG
  74             const size_type total =
  75               base_type::recursive_count(p_grandparent);
  76             _GLIBCXX_DEBUG_ASSERT(total >= 3);
  77 #endif
  78
  79             if (p_parent->m_p_left == p_nd &&
  80                 p_grandparent->m_p_right == p_parent)
  81               splay_zig_zag_left(p_nd, p_parent, p_grandparent);
  82             else if (p_parent->m_p_right == p_nd &&
  83                      p_grandparent->m_p_left == p_parent)
  84               splay_zig_zag_right(p_nd, p_parent, p_grandparent);
  85             else if (p_parent->m_p_left == p_nd &&
  86                      p_grandparent->m_p_left == p_parent)
  87               splay_zig_zig_left(p_nd, p_parent, p_grandparent);
  88             else
  89               splay_zig_zig_right(p_nd, p_parent, p_grandparent);
  90             _GLIBCXX_DEBUG_ASSERT(total ==this->recursive_count(p_nd));
  91           }
  92
  93       _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd);)
  94   }
  95 }
  96
  97 PB_DS_CLASS_T_DEC
  98 inline void
  99 PB_DS_CLASS_C_DEC::
 100 splay_zig_zag_left(node_pointer p_nd, node_pointer p_parent,
 101                    node_pointer p_grandparent)
 102 {
 103   _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent);
 104   _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent);
 105
 106   _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_grandparent);)
 107
 108   _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_left == p_nd &&
 109                         p_grandparent->m_p_right == p_parent);
 110
 111   splay_zz_start(p_nd, p_parent, p_grandparent);
 112
 113   node_pointer p_b = p_nd->m_p_right;
 114   node_pointer p_c = p_nd->m_p_left;
 115
 116   p_nd->m_p_right = p_parent;
 117   p_parent->m_p_parent = p_nd;
 118
 119   p_nd->m_p_left = p_grandparent;
 120   p_grandparent->m_p_parent = p_nd;
 121
 122   p_parent->m_p_left = p_b;
 123   if (p_b != NULL)
 124     p_b->m_p_parent = p_parent;
 125
 126   p_grandparent->m_p_right = p_c;
 127   if (p_c != NULL)
 128     p_c->m_p_parent = p_grandparent;
 129
 130   splay_zz_end(p_nd, p_parent, p_grandparent);
 131 }
 132
 133 PB_DS_CLASS_T_DEC
 134 inline void
 135 PB_DS_CLASS_C_DEC::
 136 splay_zig_zag_right(node_pointer p_nd, node_pointer p_parent,
 137                     node_pointer p_grandparent)
 138 {
 139   _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent);
 140   _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent);
 141
 142   _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_grandparent);)
 143
 144   _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_right == p_nd &&
 145                         p_grandparent->m_p_left == p_parent);
 146
 147   splay_zz_start(p_nd, p_parent, p_grandparent);
 148
 149   node_pointer p_b = p_nd->m_p_left;
 150   node_pointer p_c = p_nd->m_p_right;
 151
 152   p_nd->m_p_left = p_parent;
 153   p_parent->m_p_parent = p_nd;
 154
 155   p_nd->m_p_right = p_grandparent;
 156   p_grandparent->m_p_parent = p_nd;
 157
 158   p_parent->m_p_right = p_b;
 159   if (p_b != NULL)
 160     p_b->m_p_parent = p_parent;
 161
 162   p_grandparent->m_p_left = p_c;
 163   if (p_c != NULL)
 164     p_c->m_p_parent = p_grandparent;
 165
 166   splay_zz_end(p_nd, p_parent, p_grandparent);
 167 }
 168
 169 PB_DS_CLASS_T_DEC
 170 inline void
 171 PB_DS_CLASS_C_DEC::
 172 splay_zig_zig_left(node_pointer p_nd, node_pointer p_parent,
 173                    node_pointer p_grandparent)
 174 {
 175   _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent);
 176   _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent);
 177
 178   _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_grandparent);)
 179
 180   _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_left == p_nd &&
 181                      p_nd->m_p_parent->m_p_parent->m_p_left == p_nd->m_p_parent);
 182
 183   splay_zz_start(p_nd, p_parent, p_grandparent);
 184
 185   node_pointer p_b = p_nd->m_p_right;
 186   node_pointer p_c = p_parent->m_p_right;
 187
 188   p_nd->m_p_right = p_parent;
 189   p_parent->m_p_parent = p_nd;
 190
 191   p_parent->m_p_right = p_grandparent;
 192   p_grandparent->m_p_parent = p_parent;
 193
 194   p_parent->m_p_left = p_b;
 195   if (p_b != NULL)
 196     p_b->m_p_parent = p_parent;
 197
 198   p_grandparent->m_p_left = p_c;
 199   if (p_c != NULL)
 200     p_c->m_p_parent = p_grandparent;
 201
 202   splay_zz_end(p_nd, p_parent, p_grandparent);
 203 }
 204
 205 PB_DS_CLASS_T_DEC
 206 inline void
 207 PB_DS_CLASS_C_DEC::
 208 splay_zig_zig_right(node_pointer p_nd, node_pointer p_parent,
 209                     node_pointer p_grandparent)
 210 {
 211   _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent);
 212   _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent);
 213   _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_grandparent);)
 214   _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_right == p_nd &&
 215                   p_nd->m_p_parent->m_p_parent->m_p_right == p_nd->m_p_parent);
 216
 217   splay_zz_start(p_nd, p_parent, p_grandparent);
 218
 219   node_pointer p_b = p_nd->m_p_left;
 220   node_pointer p_c = p_parent->m_p_left;
 221
 222   p_nd->m_p_left = p_parent;
 223   p_parent->m_p_parent = p_nd;
 224
 225   p_parent->m_p_left = p_grandparent;
 226   p_grandparent->m_p_parent = p_parent;
 227
 228   p_parent->m_p_right = p_b;
 229   if (p_b != NULL)
 230     p_b->m_p_parent = p_parent;
 231
 232   p_grandparent->m_p_right = p_c;
 233   if (p_c != NULL)
 234     p_c->m_p_parent = p_grandparent;
 235
 236   base_type::update_to_top(p_grandparent, (node_update* )this);
 237   splay_zz_end(p_nd, p_parent, p_grandparent);
 238 }
 239
 240 PB_DS_CLASS_T_DEC
 241 inline void
 242 PB_DS_CLASS_C_DEC::
 243 splay_zz_start(node_pointer p_nd,
 244 #ifdef _GLIBCXX_DEBUG
 245                node_pointer p_parent,
 246 #else
 247                node_pointer /*p_parent*/,
 248 #endif
 249                node_pointer p_grandparent)
 250 {
 251   _GLIBCXX_DEBUG_ASSERT(p_nd != NULL);
 252   _GLIBCXX_DEBUG_ASSERT(p_parent != NULL);
 253   _GLIBCXX_DEBUG_ASSERT(p_grandparent != NULL);
 254
 255   const bool grandparent_head = p_grandparent->m_p_parent == base_type::m_p_head;
 256
 257   if (grandparent_head)
 258     {
 259       base_type::m_p_head->m_p_parent = base_type::m_p_head->m_p_parent;
 260       p_nd->m_p_parent = base_type::m_p_head;
 261       return;
 262     }
 263
 264   node_pointer p_greatgrandparent = p_grandparent->m_p_parent;
 265
 266   p_nd->m_p_parent = p_greatgrandparent;
 267
 268   if (p_grandparent == p_greatgrandparent->m_p_left)
 269     p_greatgrandparent->m_p_left = p_nd;
 270   else
 271     p_greatgrandparent->m_p_right = p_nd;
 272 }
 273
 274 PB_DS_CLASS_T_DEC
 275 inline void
 276 PB_DS_CLASS_C_DEC::
 277 splay_zz_end(node_pointer p_nd, node_pointer p_parent,
 278              node_pointer p_grandparent)
 279 {
 280   if (p_nd->m_p_parent == base_type::m_p_head)
 281     base_type::m_p_head->m_p_parent = p_nd;
 282
 283   apply_update(p_grandparent, (node_update* )this);
 284   apply_update(p_parent, (node_update* )this);
 285   apply_update(p_nd, (node_update* )this);
 286
 287   _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(p_nd);)
 288 }
 289