libstdc++

splay_tree_/split_join_fn_imps.hpp
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1 // -*- C++ -*-
2
3 // Copyright (C) 2005-2013 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_/split_join_fn_imps.hpp
38 * Contains an implementation class for splay_tree_.
39 */
40
41 PB_DS_CLASS_T_DEC
42 inline void
43 PB_DS_CLASS_C_DEC::
44 join(PB_DS_CLASS_C_DEC& other)
45 {
46 PB_DS_ASSERT_VALID((*this))
47 PB_DS_ASSERT_VALID(other)
48 if (base_type::join_prep(other) == false)
49 {
50 PB_DS_ASSERT_VALID((*this))
51 PB_DS_ASSERT_VALID(other)
52 return;
53 }
54
55 node_pointer p_target_r = other.leftmost(other.m_p_head);
56 _GLIBCXX_DEBUG_ASSERT(p_target_r != 0);
57 other.splay(p_target_r);
58
59 _GLIBCXX_DEBUG_ASSERT(p_target_r == other.m_p_head->m_p_parent);
60 _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left == 0);
61
62 p_target_r->m_p_left = base_type::m_p_head->m_p_parent;
63
64 _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left != 0);
65 p_target_r->m_p_left->m_p_parent = p_target_r;
66
67 base_type::m_p_head->m_p_parent = p_target_r;
68 p_target_r->m_p_parent = base_type::m_p_head;
69
70 this->apply_update(p_target_r, (node_update*)this);
71 base_type::join_finish(other);
72
73 PB_DS_ASSERT_VALID((*this))
74 PB_DS_ASSERT_VALID(other)
75 }
76
77 PB_DS_CLASS_T_DEC
78 void
79 PB_DS_CLASS_C_DEC::
80 split(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
81 {
82 PB_DS_ASSERT_VALID((*this))
83 PB_DS_ASSERT_VALID(other)
84
85 if (base_type::split_prep(r_key, other) == false)
86 {
87 PB_DS_ASSERT_VALID((*this))
88 PB_DS_ASSERT_VALID(other)
89 return;
90 }
91
92 node_pointer p_upper_bound = this->upper_bound(r_key).m_p_nd;
93 _GLIBCXX_DEBUG_ASSERT(p_upper_bound != 0);
94
95 splay(p_upper_bound);
96 _GLIBCXX_DEBUG_ASSERT(p_upper_bound->m_p_parent == this->m_p_head);
97
98 node_pointer p_new_root = p_upper_bound->m_p_left;
99 _GLIBCXX_DEBUG_ASSERT(p_new_root != 0);
100
101 base_type::m_p_head->m_p_parent = p_new_root;
102 p_new_root->m_p_parent = base_type::m_p_head;
103 other.m_p_head->m_p_parent = p_upper_bound;
104 p_upper_bound->m_p_parent = other.m_p_head;
105 p_upper_bound->m_p_left = 0;
106 this->apply_update(p_upper_bound, (node_update*)this);
107 base_type::split_finish(other);
108
109 PB_DS_ASSERT_VALID((*this))
110 PB_DS_ASSERT_VALID(other)
111 }
112