libstdc++
binary_heap_/insert_fn_imps.hpp
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1// -*- C++ -*-
2
3// Copyright (C) 2005-2019 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 binary_heap_/insert_fn_imps.hpp
38 * Contains an implementation class for a binary_heap.
39 */
40
41PB_DS_CLASS_T_DEC
42inline typename PB_DS_CLASS_C_DEC::point_iterator
43PB_DS_CLASS_C_DEC::
44push(const_reference r_val)
45{
46 PB_DS_ASSERT_VALID((*this))
47 insert_value(r_val, s_no_throw_copies_ind);
48 push_heap();
49 PB_DS_ASSERT_VALID((*this))
50 return point_iterator(m_a_entries);
51}
52
53PB_DS_CLASS_T_DEC
54inline void
55PB_DS_CLASS_C_DEC::
56insert_value(value_type val, true_type)
57{
58 resize_for_insert_if_needed();
59 m_a_entries[m_size++] = val;
60}
61
62PB_DS_CLASS_T_DEC
63inline void
64PB_DS_CLASS_C_DEC::
65insert_value(const_reference r_val, false_type)
66{
67 resize_for_insert_if_needed();
68 pointer p_new = s_value_allocator.allocate(1);
69 cond_dealtor_t cond(p_new);
70 new (p_new) value_type(r_val);
71 cond.set_no_action();
72 m_a_entries[m_size++] = p_new;
73}
74
75PB_DS_CLASS_T_DEC
76inline void
77PB_DS_CLASS_C_DEC::
78resize_for_insert_if_needed()
79{
80 if (!resize_policy::resize_needed_for_grow(m_size))
81 {
82 _GLIBCXX_DEBUG_ASSERT(m_size < m_actual_size);
83 return;
84 }
85
86 const size_type new_size = resize_policy::get_new_size_for_grow();
87 entry_pointer new_entries = s_entry_allocator.allocate(new_size);
88 resize_policy::notify_grow_resize();
89
90 std::copy(m_a_entries, m_a_entries + m_size, new_entries);
91 s_entry_allocator.deallocate(m_a_entries, m_actual_size);
92 m_actual_size = new_size;
93 m_a_entries = new_entries;
94 make_heap();
95}
96
97PB_DS_CLASS_T_DEC
98void
99PB_DS_CLASS_C_DEC::
100modify(point_iterator it, const_reference r_new_val)
101{
102 PB_DS_ASSERT_VALID((*this))
103 swap_value_imp(it.m_p_e, r_new_val, s_no_throw_copies_ind);
104 fix(it.m_p_e);
105 PB_DS_ASSERT_VALID((*this))
106}
107
108PB_DS_CLASS_T_DEC
109void
110PB_DS_CLASS_C_DEC::
111fix(entry_pointer p_e)
112{
113 size_type i = p_e - m_a_entries;
114 if (i > 0 && entry_cmp::operator()(m_a_entries[parent(i)], m_a_entries[i]))
115 {
116 size_type parent_i = parent(i);
117 while (i > 0
118 && entry_cmp::operator()(m_a_entries[parent_i], m_a_entries[i]))
119 {
120 std::swap(m_a_entries[i], m_a_entries[parent_i]);
121 i = parent_i;
122 parent_i = parent(i);
123 }
124
125 PB_DS_ASSERT_VALID((*this))
126 return;
127 }
128
129 while (i < m_size)
130 {
131 const size_type lchild_i = left_child(i);
132 const size_type rchild_i = right_child(i);
133 _GLIBCXX_DEBUG_ASSERT(rchild_i > lchild_i);
134
135 const bool smaller_than_lchild = lchild_i < m_size &&
136 entry_cmp::operator()(m_a_entries[i], m_a_entries[lchild_i]);
137
138 const bool smaller_than_rchild = rchild_i < m_size &&
139 entry_cmp::operator()(m_a_entries[i], m_a_entries[rchild_i]);
140
141 const bool swap_with_rchild = smaller_than_rchild && (!smaller_than_lchild || entry_cmp::operator()(m_a_entries[lchild_i], m_a_entries[rchild_i]));
142
143 const bool swap_with_lchild = !swap_with_rchild && smaller_than_lchild;
144
145 if (swap_with_lchild)
146 {
147 std::swap(m_a_entries[i], m_a_entries[lchild_i]);
148 i = lchild_i;
149 }
150 else if (swap_with_rchild)
151 {
152 std::swap(m_a_entries[i], m_a_entries[rchild_i]);
153 i = rchild_i;
154 }
155 else
156 i = m_size;
157 }
158}
159
160PB_DS_CLASS_T_DEC
161inline void
162PB_DS_CLASS_C_DEC::
163swap_value_imp(entry_pointer p_e, value_type new_val, true_type)
164{ *p_e = new_val; }
165
166PB_DS_CLASS_T_DEC
167inline void
168PB_DS_CLASS_C_DEC::
169swap_value_imp(entry_pointer p_e, const_reference r_new_val, false_type)
170{
171 value_type tmp(r_new_val);
172 (*p_e)->swap(tmp);
173}
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
Definition: type_traits:75
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:78