libstdc++
splay_tree_/split_join_fn_imps.hpp
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1 // -*- C++ -*-
2 
3 // Copyright (C) 2005-2017 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
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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