1// -*- C++ -*- 2 3// Copyright (C) 2005-2022 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 3, 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// Under Section 7 of GPL version 3, you are granted additional 17// permissions described in the GCC Runtime Library Exception, version 18// 3.1, as published by the Free Software Foundation. 19 20// You should have received a copy of the GNU General Public License and 21// a copy of the GCC Runtime Library Exception along with this program; 22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23// <http://www.gnu.org/licenses/>. 24 25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 26 27// Permission to use, copy, modify, sell, and distribute this software 28// is hereby granted without fee, provided that the above copyright 29// notice appears in all copies, and that both that copyright notice 30// and this permission notice appear in supporting documentation. None 31// of the above authors, nor IBM Haifa Research Laboratories, make any 32// representation about the suitability of this software for any 33// purpose. It is provided "as is" without express or implied 34// warranty. 35 36/** 37 * @file splay_tree_/splay_fn_imps.hpp 38 * Contains an implementation class for splay_tree_. 39 */ 40 41#ifdef PB_DS_CLASS_C_DEC 42 43PB_DS_CLASS_T_DEC 44void 45PB_DS_CLASS_C_DEC:: 46splay(node_pointer p_nd) 47{ 48 while (p_nd->m_p_parent != base_type::m_p_head) 49 { 50#ifdef _GLIBCXX_DEBUG 51 { 52 node_pointer p_head = base_type::m_p_head; 53 assert_special_imp(p_head, __FILE__, __LINE__); 54 } 55#endif 56 57 PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd) 58 59 if (p_nd->m_p_parent->m_p_parent == base_type::m_p_head) 60 { 61 base_type::rotate_parent(p_nd); 62 _GLIBCXX_DEBUG_ASSERT(p_nd == this->m_p_head->m_p_parent); 63 } 64 else 65 { 66 const node_pointer p_parent = p_nd->m_p_parent; 67 const node_pointer p_grandparent = p_parent->m_p_parent; 68 69#ifdef _GLIBCXX_DEBUG 70 const size_type total = 71 base_type::recursive_count(p_grandparent); 72 _GLIBCXX_DEBUG_ASSERT(total >= 3); 73#endif 74 75 if (p_parent->m_p_left == p_nd && 76 p_grandparent->m_p_right == p_parent) 77 splay_zig_zag_left(p_nd, p_parent, p_grandparent); 78 else if (p_parent->m_p_right == p_nd && 79 p_grandparent->m_p_left == p_parent) 80 splay_zig_zag_right(p_nd, p_parent, p_grandparent); 81 else if (p_parent->m_p_left == p_nd && 82 p_grandparent->m_p_left == p_parent) 83 splay_zig_zig_left(p_nd, p_parent, p_grandparent); 84 else 85 splay_zig_zig_right(p_nd, p_parent, p_grandparent); 86 _GLIBCXX_DEBUG_ASSERT(total ==this->recursive_count(p_nd)); 87 } 88 89 PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd) 90 } 91} 92 93PB_DS_CLASS_T_DEC 94inline void 95PB_DS_CLASS_C_DEC:: 96splay_zig_zag_left(node_pointer p_nd, node_pointer p_parent, 97 node_pointer p_grandparent) 98{ 99 _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); 100 _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); 101 102 PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) 103 104 _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_left == p_nd && 105 p_grandparent->m_p_right == p_parent); 106 107 splay_zz_start(p_nd, p_parent, p_grandparent); 108 109 node_pointer p_b = p_nd->m_p_right; 110 node_pointer p_c = p_nd->m_p_left; 111 112 p_nd->m_p_right = p_parent; 113 p_parent->m_p_parent = p_nd; 114 115 p_nd->m_p_left = p_grandparent; 116 p_grandparent->m_p_parent = p_nd; 117 118 p_parent->m_p_left = p_b; 119 if (p_b != 0) 120 p_b->m_p_parent = p_parent; 121 122 p_grandparent->m_p_right = p_c; 123 if (p_c != 0) 124 p_c->m_p_parent = p_grandparent; 125 126 splay_zz_end(p_nd, p_parent, p_grandparent); 127} 128 129PB_DS_CLASS_T_DEC 130inline void 131PB_DS_CLASS_C_DEC:: 132splay_zig_zag_right(node_pointer p_nd, node_pointer p_parent, 133 node_pointer p_grandparent) 134{ 135 _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); 136 _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); 137 138 PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) 139 140 _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_right == p_nd && 141 p_grandparent->m_p_left == p_parent); 142 143 splay_zz_start(p_nd, p_parent, p_grandparent); 144 145 node_pointer p_b = p_nd->m_p_left; 146 node_pointer p_c = p_nd->m_p_right; 147 148 p_nd->m_p_left = p_parent; 149 p_parent->m_p_parent = p_nd; 150 151 p_nd->m_p_right = p_grandparent; 152 p_grandparent->m_p_parent = p_nd; 153 154 p_parent->m_p_right = p_b; 155 if (p_b != 0) 156 p_b->m_p_parent = p_parent; 157 158 p_grandparent->m_p_left = p_c; 159 if (p_c != 0) 160 p_c->m_p_parent = p_grandparent; 161 162 splay_zz_end(p_nd, p_parent, p_grandparent); 163} 164 165PB_DS_CLASS_T_DEC 166inline void 167PB_DS_CLASS_C_DEC:: 168splay_zig_zig_left(node_pointer p_nd, node_pointer p_parent, 169 node_pointer p_grandparent) 170{ 171 _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); 172 _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); 173 174 PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) 175 176 _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_left == p_nd && 177 p_nd->m_p_parent->m_p_parent->m_p_left == p_nd->m_p_parent); 178 179 splay_zz_start(p_nd, p_parent, p_grandparent); 180 181 node_pointer p_b = p_nd->m_p_right; 182 node_pointer p_c = p_parent->m_p_right; 183 184 p_nd->m_p_right = p_parent; 185 p_parent->m_p_parent = p_nd; 186 187 p_parent->m_p_right = p_grandparent; 188 p_grandparent->m_p_parent = p_parent; 189 190 p_parent->m_p_left = p_b; 191 if (p_b != 0) 192 p_b->m_p_parent = p_parent; 193 194 p_grandparent->m_p_left = p_c; 195 if (p_c != 0) 196 p_c->m_p_parent = p_grandparent; 197 198 splay_zz_end(p_nd, p_parent, p_grandparent); 199} 200 201PB_DS_CLASS_T_DEC 202inline void 203PB_DS_CLASS_C_DEC:: 204splay_zig_zig_right(node_pointer p_nd, node_pointer p_parent, 205 node_pointer p_grandparent) 206{ 207 _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); 208 _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); 209 PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) 210 _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_right == p_nd && 211 p_nd->m_p_parent->m_p_parent->m_p_right == p_nd->m_p_parent); 212 213 splay_zz_start(p_nd, p_parent, p_grandparent); 214 215 node_pointer p_b = p_nd->m_p_left; 216 node_pointer p_c = p_parent->m_p_left; 217 218 p_nd->m_p_left = p_parent; 219 p_parent->m_p_parent = p_nd; 220 221 p_parent->m_p_left = p_grandparent; 222 p_grandparent->m_p_parent = p_parent; 223 224 p_parent->m_p_right = p_b; 225 if (p_b != 0) 226 p_b->m_p_parent = p_parent; 227 228 p_grandparent->m_p_right = p_c; 229 if (p_c != 0) 230 p_c->m_p_parent = p_grandparent; 231 232 base_type::update_to_top(p_grandparent, (node_update*)this); 233 splay_zz_end(p_nd, p_parent, p_grandparent); 234} 235 236PB_DS_CLASS_T_DEC 237inline void 238PB_DS_CLASS_C_DEC:: 239splay_zz_start(node_pointer p_nd, 240#ifdef _GLIBCXX_DEBUG 241 node_pointer p_parent, 242#else 243 node_pointer /*p_parent*/, 244#endif 245 node_pointer p_grandparent) 246{ 247 _GLIBCXX_DEBUG_ASSERT(p_nd != 0); 248 _GLIBCXX_DEBUG_ASSERT(p_parent != 0); 249 _GLIBCXX_DEBUG_ASSERT(p_grandparent != 0); 250 251 const bool grandparent_head = p_grandparent->m_p_parent == base_type::m_p_head; 252 253 if (grandparent_head) 254 { 255 base_type::m_p_head->m_p_parent = base_type::m_p_head->m_p_parent; 256 p_nd->m_p_parent = base_type::m_p_head; 257 return; 258 } 259 260 node_pointer p_greatgrandparent = p_grandparent->m_p_parent; 261 262 p_nd->m_p_parent = p_greatgrandparent; 263 264 if (p_grandparent == p_greatgrandparent->m_p_left) 265 p_greatgrandparent->m_p_left = p_nd; 266 else 267 p_greatgrandparent->m_p_right = p_nd; 268} 269 270PB_DS_CLASS_T_DEC 271inline void 272PB_DS_CLASS_C_DEC:: 273splay_zz_end(node_pointer p_nd, node_pointer p_parent, 274 node_pointer p_grandparent) 275{ 276 if (p_nd->m_p_parent == base_type::m_p_head) 277 base_type::m_p_head->m_p_parent = p_nd; 278 279 this->apply_update(p_grandparent, (node_update*)this); 280 this->apply_update(p_parent, (node_update*)this); 281 this->apply_update(p_nd, (node_update*)this); 282 PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd) 283} 284#endif 285