Edit File: splay_fn_imps.hpp
// -*- C++ -*- // Copyright (C) 2005-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the terms // of the GNU General Public License as published by the Free Software // Foundation; either version 3, or (at your option) any later // version. // This library is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. // Permission to use, copy, modify, sell, and distribute this software // is hereby granted without fee, provided that the above copyright // notice appears in all copies, and that both that copyright notice // and this permission notice appear in supporting documentation. None // of the above authors, nor IBM Haifa Research Laboratories, make any // representation about the suitability of this software for any // purpose. It is provided "as is" without express or implied // warranty. /** * @file splay_tree_/splay_fn_imps.hpp * Contains an implementation class for splay_tree_. */ PB_DS_CLASS_T_DEC void PB_DS_CLASS_C_DEC:: splay(node_pointer p_nd) { while (p_nd->m_p_parent != base_type::m_p_head) { #ifdef _GLIBCXX_DEBUG { node_pointer p_head = base_type::m_p_head; assert_special_imp(p_head, __FILE__, __LINE__); } #endif PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd) if (p_nd->m_p_parent->m_p_parent == base_type::m_p_head) { base_type::rotate_parent(p_nd); _GLIBCXX_DEBUG_ASSERT(p_nd == this->m_p_head->m_p_parent); } else { const node_pointer p_parent = p_nd->m_p_parent; const node_pointer p_grandparent = p_parent->m_p_parent; #ifdef _GLIBCXX_DEBUG const size_type total = base_type::recursive_count(p_grandparent); _GLIBCXX_DEBUG_ASSERT(total >= 3); #endif if (p_parent->m_p_left == p_nd && p_grandparent->m_p_right == p_parent) splay_zig_zag_left(p_nd, p_parent, p_grandparent); else if (p_parent->m_p_right == p_nd && p_grandparent->m_p_left == p_parent) splay_zig_zag_right(p_nd, p_parent, p_grandparent); else if (p_parent->m_p_left == p_nd && p_grandparent->m_p_left == p_parent) splay_zig_zig_left(p_nd, p_parent, p_grandparent); else splay_zig_zig_right(p_nd, p_parent, p_grandparent); _GLIBCXX_DEBUG_ASSERT(total ==this->recursive_count(p_nd)); } PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd) } } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: splay_zig_zag_left(node_pointer p_nd, node_pointer p_parent, node_pointer p_grandparent) { _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_left == p_nd && p_grandparent->m_p_right == p_parent); splay_zz_start(p_nd, p_parent, p_grandparent); node_pointer p_b = p_nd->m_p_right; node_pointer p_c = p_nd->m_p_left; p_nd->m_p_right = p_parent; p_parent->m_p_parent = p_nd; p_nd->m_p_left = p_grandparent; p_grandparent->m_p_parent = p_nd; p_parent->m_p_left = p_b; if (p_b != 0) p_b->m_p_parent = p_parent; p_grandparent->m_p_right = p_c; if (p_c != 0) p_c->m_p_parent = p_grandparent; splay_zz_end(p_nd, p_parent, p_grandparent); } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: splay_zig_zag_right(node_pointer p_nd, node_pointer p_parent, node_pointer p_grandparent) { _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_right == p_nd && p_grandparent->m_p_left == p_parent); splay_zz_start(p_nd, p_parent, p_grandparent); node_pointer p_b = p_nd->m_p_left; node_pointer p_c = p_nd->m_p_right; p_nd->m_p_left = p_parent; p_parent->m_p_parent = p_nd; p_nd->m_p_right = p_grandparent; p_grandparent->m_p_parent = p_nd; p_parent->m_p_right = p_b; if (p_b != 0) p_b->m_p_parent = p_parent; p_grandparent->m_p_left = p_c; if (p_c != 0) p_c->m_p_parent = p_grandparent; splay_zz_end(p_nd, p_parent, p_grandparent); } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: splay_zig_zig_left(node_pointer p_nd, node_pointer p_parent, node_pointer p_grandparent) { _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_left == p_nd && p_nd->m_p_parent->m_p_parent->m_p_left == p_nd->m_p_parent); splay_zz_start(p_nd, p_parent, p_grandparent); node_pointer p_b = p_nd->m_p_right; node_pointer p_c = p_parent->m_p_right; p_nd->m_p_right = p_parent; p_parent->m_p_parent = p_nd; p_parent->m_p_right = p_grandparent; p_grandparent->m_p_parent = p_parent; p_parent->m_p_left = p_b; if (p_b != 0) p_b->m_p_parent = p_parent; p_grandparent->m_p_left = p_c; if (p_c != 0) p_c->m_p_parent = p_grandparent; splay_zz_end(p_nd, p_parent, p_grandparent); } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: splay_zig_zig_right(node_pointer p_nd, node_pointer p_parent, node_pointer p_grandparent) { _GLIBCXX_DEBUG_ASSERT(p_parent == p_nd->m_p_parent); _GLIBCXX_DEBUG_ASSERT(p_grandparent == p_parent->m_p_parent); PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_grandparent) _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_right == p_nd && p_nd->m_p_parent->m_p_parent->m_p_right == p_nd->m_p_parent); splay_zz_start(p_nd, p_parent, p_grandparent); node_pointer p_b = p_nd->m_p_left; node_pointer p_c = p_parent->m_p_left; p_nd->m_p_left = p_parent; p_parent->m_p_parent = p_nd; p_parent->m_p_left = p_grandparent; p_grandparent->m_p_parent = p_parent; p_parent->m_p_right = p_b; if (p_b != 0) p_b->m_p_parent = p_parent; p_grandparent->m_p_right = p_c; if (p_c != 0) p_c->m_p_parent = p_grandparent; base_type::update_to_top(p_grandparent, (node_update*)this); splay_zz_end(p_nd, p_parent, p_grandparent); } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: splay_zz_start(node_pointer p_nd, #ifdef _GLIBCXX_DEBUG node_pointer p_parent, #else node_pointer /*p_parent*/, #endif node_pointer p_grandparent) { _GLIBCXX_DEBUG_ASSERT(p_nd != 0); _GLIBCXX_DEBUG_ASSERT(p_parent != 0); _GLIBCXX_DEBUG_ASSERT(p_grandparent != 0); const bool grandparent_head = p_grandparent->m_p_parent == base_type::m_p_head; if (grandparent_head) { base_type::m_p_head->m_p_parent = base_type::m_p_head->m_p_parent; p_nd->m_p_parent = base_type::m_p_head; return; } node_pointer p_greatgrandparent = p_grandparent->m_p_parent; p_nd->m_p_parent = p_greatgrandparent; if (p_grandparent == p_greatgrandparent->m_p_left) p_greatgrandparent->m_p_left = p_nd; else p_greatgrandparent->m_p_right = p_nd; } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: splay_zz_end(node_pointer p_nd, node_pointer p_parent, node_pointer p_grandparent) { if (p_nd->m_p_parent == base_type::m_p_head) base_type::m_p_head->m_p_parent = p_nd; this->apply_update(p_grandparent, (node_update*)this); this->apply_update(p_parent, (node_update*)this); this->apply_update(p_nd, (node_update*)this); PB_DS_ASSERT_BASE_NODE_CONSISTENT(p_nd) }