3 // Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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
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.
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.
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
31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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
43 * @file rotate_fn_imps.hpp
44 * Contains imps for rotating nodes.
50 rotate_left(node_pointer p_x)
52 node_pointer p_y = p_x->m_p_right;
54 p_x->m_p_right = p_y->m_p_left;
56 if (p_y->m_p_left != NULL)
57 p_y->m_p_left->m_p_parent = p_x;
59 p_y->m_p_parent = p_x->m_p_parent;
61 if (p_x == m_p_head->m_p_parent)
62 m_p_head->m_p_parent = p_y;
63 else if (p_x == p_x->m_p_parent->m_p_left)
64 p_x->m_p_parent->m_p_left = p_y;
66 p_x->m_p_parent->m_p_right = p_y;
69 p_x->m_p_parent = p_y;
71 _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_x);)
72 _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_y);)
74 apply_update(p_x, (node_update* )this);
75 apply_update(p_x->m_p_parent, (node_update* )this);
81 rotate_right(node_pointer p_x)
83 node_pointer p_y = p_x->m_p_left;
85 p_x->m_p_left = p_y->m_p_right;
87 if (p_y->m_p_right != NULL)
88 p_y->m_p_right->m_p_parent = p_x;
90 p_y->m_p_parent = p_x->m_p_parent;
92 if (p_x == m_p_head->m_p_parent)
93 m_p_head->m_p_parent = p_y;
94 else if (p_x == p_x->m_p_parent->m_p_right)
95 p_x->m_p_parent->m_p_right = p_y;
97 p_x->m_p_parent->m_p_left = p_y;
100 p_x->m_p_parent = p_y;
102 _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_x);)
103 _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_y);)
105 apply_update(p_x, (node_update* )this);
106 apply_update(p_x->m_p_parent, (node_update* )this);
112 rotate_parent(node_pointer p_nd)
114 node_pointer p_parent = p_nd->m_p_parent;
116 if (p_nd == p_parent->m_p_left)
117 rotate_right(p_parent);
119 rotate_left(p_parent);
121 _GLIBCXX_DEBUG_ASSERT(p_parent->m_p_parent = p_nd);
122 _GLIBCXX_DEBUG_ASSERT(p_nd->m_p_left == p_parent ||
123 p_nd->m_p_right == p_parent);
129 apply_update(node_pointer /*p_nd*/, null_node_update_pointer /*p_update*/)
133 template<typename Node_Update_>
136 apply_update(node_pointer p_nd, Node_Update_* /*p_update*/)
138 node_update::operator()(
140 const_node_iterator(static_cast<node_pointer>(NULL)));
144 template<typename Node_Update_>
147 update_to_top(node_pointer p_nd, Node_Update_* p_update)
149 while (p_nd != m_p_head)
151 apply_update(p_nd, p_update);
153 p_nd = p_nd->m_p_parent;
160 update_to_top(node_pointer /*p_nd*/, null_node_update_pointer /*p_update*/)