| // -*- C++ -*- |
| |
| // Copyright (C) 2005-2014 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) |
| } |