libstdc++

rc_binomial_heap_/insert_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 rc_binomial_heap_/insert_fn_imps.hpp
38 * Contains an implementation for rc_binomial_heap_.
39 */
40
41 PB_DS_CLASS_T_DEC
42 inline typename PB_DS_CLASS_C_DEC::point_iterator
43 PB_DS_CLASS_C_DEC::
44 push(const_reference r_val)
45 {
46 PB_DS_ASSERT_VALID((*this))
47
48 make_0_exposed();
49
50 PB_DS_ASSERT_VALID((*this))
51
52 node_pointer p_nd = base_type::get_new_node_for_insert(r_val);
53
54 p_nd->m_p_l_child = p_nd->m_p_prev_or_parent = 0;
55 p_nd->m_metadata = 0;
56
57 if (base_type::m_p_max == 0 || Cmp_Fn::operator()(base_type::m_p_max->m_value, r_val))
58 base_type::m_p_max = p_nd;
59
60 p_nd->m_p_next_sibling = base_type::m_p_root;
61
62 if (base_type::m_p_root != 0)
63 base_type::m_p_root->m_p_prev_or_parent = p_nd;
64
65 base_type::m_p_root = p_nd;
66
67 if (p_nd->m_p_next_sibling != 0&& p_nd->m_p_next_sibling->m_metadata == 0)
68 m_rc.push(p_nd);
69
70 PB_DS_ASSERT_VALID((*this))
71
72 return point_iterator(p_nd);
73 }
74
75 PB_DS_CLASS_T_DEC
76 void
77 PB_DS_CLASS_C_DEC::
78 modify(point_iterator it, const_reference r_new_val)
79 {
80 PB_DS_ASSERT_VALID((*this))
81
82 make_binomial_heap();
83
84 base_type::modify(it, r_new_val);
85
86 base_type::find_max();
87
88 PB_DS_ASSERT_VALID((*this))
89 }
90
91 PB_DS_CLASS_T_DEC
92 inline typename PB_DS_CLASS_C_DEC::node_pointer
93 PB_DS_CLASS_C_DEC::
94 link_with_next_sibling(node_pointer p_nd)
95 {
96 node_pointer p_next = p_nd->m_p_next_sibling;
97
98 _GLIBCXX_DEBUG_ASSERT(p_next != 0);
99 _GLIBCXX_DEBUG_ASSERT(p_next->m_p_prev_or_parent == p_nd);
100
101 if (Cmp_Fn::operator()(p_nd->m_value, p_next->m_value))
102 {
103 p_next->m_p_prev_or_parent = p_nd->m_p_prev_or_parent;
104
105 if (p_next->m_p_prev_or_parent == 0)
106 base_type::m_p_root = p_next;
107 else
108 p_next->m_p_prev_or_parent->m_p_next_sibling = p_next;
109
110 if (base_type::m_p_max == p_nd)
111 base_type::m_p_max = p_next;
112
113 base_type::make_child_of(p_nd, p_next);
114
115 ++p_next->m_metadata;
116
117 return p_next;
118 }
119
120 p_nd->m_p_next_sibling = p_next->m_p_next_sibling;
121
122 if (p_nd->m_p_next_sibling != 0)
123 p_nd->m_p_next_sibling->m_p_prev_or_parent = p_nd;
124
125 if (base_type::m_p_max == p_next)
126 base_type::m_p_max = p_nd;
127
128 base_type::make_child_of(p_next, p_nd);
129
130 ++p_nd->m_metadata;
131
132 return p_nd;
133 }
134
135 PB_DS_CLASS_T_DEC
136 void
137 PB_DS_CLASS_C_DEC::
138 make_0_exposed()
139 {
140 if (m_rc.empty())
141 return;
142
143 node_pointer p_nd = m_rc.top();
144
145 m_rc.pop();
146
147 _GLIBCXX_DEBUG_ASSERT(p_nd->m_p_next_sibling != 0);
148 _GLIBCXX_DEBUG_ASSERT(p_nd->m_metadata == p_nd->m_p_next_sibling->m_metadata);
149
150 node_pointer p_res = link_with_next_sibling(p_nd);
151
152 if (p_res->m_p_next_sibling != 0&& p_res->m_metadata == p_res->m_p_next_sibling->m_metadata)
153 m_rc.push(p_res);
154 }