libstdc++: split_join_fn_imps.hpp Source File

libstdc++

pairing_heap_/split_join_fn_imps.hpp
Go to the documentation of this file.
1// -*- C++ -*-
2
3// Copyright (C) 2005-2026 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#ifdef PB_DS_CLASS_C_DEC
42
43PB_DS_CLASS_T_DEC
44template<typename Pred>
45void
46PB_DS_CLASS_C_DEC::
47split(Pred pred, PB_DS_CLASS_C_DEC& other)
48{
49 PB_DS_ASSERT_VALID((*this))
50 PB_DS_ASSERT_VALID(other)
51
52 other.clear();
53
54 if (base_type::empty())
55 {
56 PB_DS_ASSERT_VALID((*this))
57 PB_DS_ASSERT_VALID(other)
58 return;
59 }
60
61 base_type::to_linked_list();
62 node_pointer p_out = base_type::prune(pred);
63 while (p_out != 0)
64 {
65 _GLIBCXX_DEBUG_ASSERT(base_type::m_size > 0);
66 --base_type::m_size;
67 ++other.m_size;
68 node_pointer p_next = p_out->m_p_next_sibling;
69 p_out->m_p_l_child = p_out->m_p_next_sibling = p_out->m_p_prev_or_parent = 0;
70
71 other.push_imp(p_out);
72 p_out = p_next;
73 }
74
75 PB_DS_ASSERT_VALID(other)
76 node_pointer p_cur = base_type::m_p_root;
77 base_type::m_p_root = 0;
78 while (p_cur != 0)
79 {
80 node_pointer p_next = p_cur->m_p_next_sibling;
81 p_cur->m_p_l_child = p_cur->m_p_next_sibling = p_cur->m_p_prev_or_parent = 0;
82
83 push_imp(p_cur);
84 p_cur = p_next;
85 }
86
87 PB_DS_ASSERT_VALID((*this))
88 PB_DS_ASSERT_VALID(other)
89}
90
91PB_DS_CLASS_T_DEC
92inline void
93PB_DS_CLASS_C_DEC::
94join(PB_DS_CLASS_C_DEC& other)
95{
96 PB_DS_ASSERT_VALID((*this))
97 PB_DS_ASSERT_VALID(other)
98
99 if (other.m_p_root == 0)
100 {
101 PB_DS_ASSERT_VALID((*this))
102 PB_DS_ASSERT_VALID(other)
103 return;
104 }
105
106 if (base_type::m_p_root == 0)
107 base_type::m_p_root = other.m_p_root;
108 else if (Cmp_Fn::operator()(base_type::m_p_root->m_value, other.m_p_root->m_value))
109 {
110 base_type::make_child_of(base_type::m_p_root, other.m_p_root);
111 PB_DS_ASSERT_NODE_CONSISTENT(other.m_p_root, false)
112 base_type::m_p_root = other.m_p_root;
113 }
114 else
115 {
116 base_type::make_child_of(other.m_p_root, base_type::m_p_root);
117 PB_DS_ASSERT_NODE_CONSISTENT(base_type::m_p_root, false)
118 }
119
120 base_type::m_size += other.m_size;
121 other.m_p_root = 0;
122 other.m_size = 0;
123 PB_DS_ASSERT_VALID((*this))
124 PB_DS_ASSERT_VALID(other)
125}
126#endif