libstdc++

pairing_heap_/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 pairing_heap_/split_join_fn_imps.hpp
38 * Contains an implementation class for a pairing heap.
39 */
40
41 PB_DS_CLASS_T_DEC
42 template<typename Pred>
43 void
44 PB_DS_CLASS_C_DEC::
45 split(Pred pred, PB_DS_CLASS_C_DEC& other)
46 {
47 PB_DS_ASSERT_VALID((*this))
48 PB_DS_ASSERT_VALID(other)
49
50 other.clear();
51
52 if (base_type::empty())
53 {
54 PB_DS_ASSERT_VALID((*this))
55 PB_DS_ASSERT_VALID(other)
56 return;
57 }
58
59 base_type::to_linked_list();
60 node_pointer p_out = base_type::prune(pred);
61 while (p_out != 0)
62 {
63 _GLIBCXX_DEBUG_ASSERT(base_type::m_size > 0);
64 --base_type::m_size;
65 ++other.m_size;
66 node_pointer p_next = p_out->m_p_next_sibling;
67 p_out->m_p_l_child = p_out->m_p_next_sibling = p_out->m_p_prev_or_parent = 0;
68
69 other.push_imp(p_out);
70 p_out = p_next;
71 }
72
73 PB_DS_ASSERT_VALID(other)
74 node_pointer p_cur = base_type::m_p_root;
75 base_type::m_p_root = 0;
76 while (p_cur != 0)
77 {
78 node_pointer p_next = p_cur->m_p_next_sibling;
79 p_cur->m_p_l_child = p_cur->m_p_next_sibling = p_cur->m_p_prev_or_parent = 0;
80
81 push_imp(p_cur);
82 p_cur = p_next;
83 }
84
85 PB_DS_ASSERT_VALID((*this))
86 PB_DS_ASSERT_VALID(other)
87 }
88
89 PB_DS_CLASS_T_DEC
90 inline void
91 PB_DS_CLASS_C_DEC::
92 join(PB_DS_CLASS_C_DEC& other)
93 {
94 PB_DS_ASSERT_VALID((*this))
95 PB_DS_ASSERT_VALID(other)
96
97 if (other.m_p_root == 0)
98 {
99 PB_DS_ASSERT_VALID((*this))
100 PB_DS_ASSERT_VALID(other)
101 return;
102 }
103
104 if (base_type::m_p_root == 0)
105 base_type::m_p_root = other.m_p_root;
106 else if (Cmp_Fn::operator()(base_type::m_p_root->m_value, other.m_p_root->m_value))
107 {
108 base_type::make_child_of(base_type::m_p_root, other.m_p_root);
109 PB_DS_ASSERT_NODE_CONSISTENT(other.m_p_root, false)
110 base_type::m_p_root = other.m_p_root;
111 }
112 else
113 {
114 base_type::make_child_of(other.m_p_root, base_type::m_p_root);
115 PB_DS_ASSERT_NODE_CONSISTENT(base_type::m_p_root, false)
116 }
117
118 base_type::m_size += other.m_size;
119 other.m_p_root = 0;
120 other.m_size = 0;
121 PB_DS_ASSERT_VALID((*this))
122 PB_DS_ASSERT_VALID(other)
123 }