1 // -*- C++ -*-
2
3 // Copyright (C) 2005-2021 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 #ifdef PB_DS_CLASS_C_DEC
42
43 PB_DS_CLASS_T_DEC
44 inline void
45 PB_DS_CLASS_C_DEC::
join(PB_DS_CLASS_C_DEC & other)46 join(PB_DS_CLASS_C_DEC& other)
47 {
48 PB_DS_ASSERT_VALID((*this))
49 PB_DS_ASSERT_VALID(other)
50 if (base_type::join_prep(other) == false)
51 {
52 PB_DS_ASSERT_VALID((*this))
53 PB_DS_ASSERT_VALID(other)
54 return;
55 }
56
57 node_pointer p_target_r = other.leftmost(other.m_p_head);
58 _GLIBCXX_DEBUG_ASSERT(p_target_r != 0);
59 other.splay(p_target_r);
60
61 _GLIBCXX_DEBUG_ASSERT(p_target_r == other.m_p_head->m_p_parent);
62 _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left == 0);
63
64 p_target_r->m_p_left = base_type::m_p_head->m_p_parent;
65
66 _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left != 0);
67 p_target_r->m_p_left->m_p_parent = p_target_r;
68
69 base_type::m_p_head->m_p_parent = p_target_r;
70 p_target_r->m_p_parent = base_type::m_p_head;
71
72 this->apply_update(p_target_r, (node_update*)this);
73 base_type::join_finish(other);
74
75 PB_DS_ASSERT_VALID((*this))
76 PB_DS_ASSERT_VALID(other)
77 }
78
79 PB_DS_CLASS_T_DEC
80 void
81 PB_DS_CLASS_C_DEC::
split(key_const_reference r_key,PB_DS_CLASS_C_DEC & other)82 split(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
83 {
84 PB_DS_ASSERT_VALID((*this))
85 PB_DS_ASSERT_VALID(other)
86
87 if (base_type::split_prep(r_key, other) == false)
88 {
89 PB_DS_ASSERT_VALID((*this))
90 PB_DS_ASSERT_VALID(other)
91 return;
92 }
93
94 node_pointer p_upper_bound = this->upper_bound(r_key).m_p_nd;
95 _GLIBCXX_DEBUG_ASSERT(p_upper_bound != 0);
96
97 splay(p_upper_bound);
98 _GLIBCXX_DEBUG_ASSERT(p_upper_bound->m_p_parent == this->m_p_head);
99
100 node_pointer p_new_root = p_upper_bound->m_p_left;
101 _GLIBCXX_DEBUG_ASSERT(p_new_root != 0);
102
103 base_type::m_p_head->m_p_parent = p_new_root;
104 p_new_root->m_p_parent = base_type::m_p_head;
105 other.m_p_head->m_p_parent = p_upper_bound;
106 p_upper_bound->m_p_parent = other.m_p_head;
107 p_upper_bound->m_p_left = 0;
108 this->apply_update(p_upper_bound, (node_update*)this);
109 base_type::split_finish(other);
110
111 PB_DS_ASSERT_VALID((*this))
112 PB_DS_ASSERT_VALID(other)
113 }
114
115 #endif
116