1// -*- C++ -*-
2
3// Copyright (C) 2005, 2006 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 2, 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// You should have received a copy of the GNU General Public License
17// along with this library; see the file COPYING.  If not, write to
18// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
19// MA 02111-1307, USA.
20
21// As a special exception, you may use this file as part of a free
22// software library without restriction.  Specifically, if other files
23// instantiate templates or use macros or inline functions from this
24// file, or you compile this file and link it with other files to
25// produce an executable, this file does not by itself cause the
26// resulting executable to be covered by the GNU General Public
27// License.  This exception does not however invalidate any other
28// reasons why the executable file might be covered by the GNU General
29// Public License.
30
31// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
32
33// Permission to use, copy, modify, sell, and distribute this software
34// is hereby granted without fee, provided that the above copyright
35// notice appears in all copies, and that both that copyright notice
36// and this permission notice appear in supporting documentation. None
37// of the above authors, nor IBM Haifa Research Laboratories, make any
38// representation about the suitability of this software for any
39// purpose. It is provided "as is" without express or implied
40// warranty.
41
42/**
43 * @file insert_fn_imps.hpp
44 * Contains an implementation class for a binary_heap.
45 */
46
47PB_DS_CLASS_T_DEC
48inline typename PB_DS_CLASS_C_DEC::point_iterator
49PB_DS_CLASS_C_DEC::
50push(const_reference r_val)
51{
52  _GLIBCXX_DEBUG_ONLY(assert_valid();)
53
54    insert_value(r_val, s_no_throw_copies_ind);
55
56  std::push_heap(m_a_entries, m_a_entries + m_size, static_cast<entry_cmp& >(*this));
57
58  _GLIBCXX_DEBUG_ONLY(assert_valid();)
59
60    return point_iterator(m_a_entries);
61}
62
63PB_DS_CLASS_T_DEC
64inline void
65PB_DS_CLASS_C_DEC::
66insert_value(value_type val, true_type)
67{
68  resize_for_insert_if_needed();
69
70  m_a_entries[m_size++] = val;
71}
72
73PB_DS_CLASS_T_DEC
74inline void
75PB_DS_CLASS_C_DEC::
76insert_value(const_reference r_val, false_type)
77{
78  resize_for_insert_if_needed();
79
80  pointer p_new = s_value_allocator.allocate(1);
81
82  cond_dealtor_t cond(p_new);
83
84  new (p_new) value_type(r_val);
85
86  cond.set_no_action();
87
88  m_a_entries[m_size++] = p_new;
89}
90
91PB_DS_CLASS_T_DEC
92inline void
93PB_DS_CLASS_C_DEC::
94insert_entry(entry e)
95{
96  resize_for_insert_if_needed();
97
98  m_a_entries[m_size++] = e;
99}
100
101PB_DS_CLASS_T_DEC
102inline void
103PB_DS_CLASS_C_DEC::
104resize_for_insert_if_needed()
105{
106  if (!resize_policy::resize_needed_for_grow(m_size))
107    {
108      _GLIBCXX_DEBUG_ASSERT(m_size < m_actual_size);
109
110      return;
111    }
112
113  const size_type new_actual_size =
114    resize_policy::get_new_size_for_grow();
115
116  entry_pointer a_new_entries = s_entry_allocator.allocate(new_actual_size);
117
118  resize_policy::notify_grow_resize();
119
120  std::copy(m_a_entries, m_a_entries + m_size, a_new_entries);
121
122  s_entry_allocator.deallocate(m_a_entries, m_actual_size);
123
124  m_actual_size = new_actual_size;
125
126  m_a_entries = a_new_entries;
127}
128
129PB_DS_CLASS_T_DEC
130void
131PB_DS_CLASS_C_DEC::
132modify(point_iterator it, const_reference r_new_val)
133{
134  _GLIBCXX_DEBUG_ONLY(assert_valid();)
135
136    swap_value_imp(it.m_p_e, r_new_val, s_no_throw_copies_ind);
137
138  fix(it.m_p_e);
139
140  _GLIBCXX_DEBUG_ONLY(assert_valid();)
141    }
142
143PB_DS_CLASS_T_DEC
144void
145PB_DS_CLASS_C_DEC::
146fix(entry_pointer p_e)
147{
148  size_type i = p_e - m_a_entries;
149
150  if (i > 0&&  entry_cmp::operator()(m_a_entries[parent(i)], m_a_entries[i]))
151    {
152      size_type parent_i = parent(i);
153
154      while (i > 0&&  entry_cmp::operator()(m_a_entries[parent_i], m_a_entries[i]))
155        {
156	  std::swap(m_a_entries[i], m_a_entries[parent_i]);
157
158	  i = parent_i;
159
160	  parent_i = parent(i);
161        }
162
163      _GLIBCXX_DEBUG_ONLY(assert_valid();)
164
165        return;
166    }
167
168  while (i < m_size)
169    {
170      const size_type left_child_i = left_child(i);
171      const size_type right_child_i = right_child(i);
172
173      _GLIBCXX_DEBUG_ASSERT(right_child_i > left_child_i);
174
175      const bool smaller_than_left_child =
176	left_child_i < m_size&&
177	entry_cmp::operator()(m_a_entries[i], m_a_entries[left_child_i]);
178
179      const bool smaller_than_right_child =
180	right_child_i < m_size&&
181	entry_cmp::operator()(m_a_entries[i], m_a_entries[right_child_i]);
182
183      const bool swap_with_r_child = smaller_than_right_child&& (!smaller_than_left_child ||
184								 entry_cmp::operator()(m_a_entries[left_child_i], m_a_entries[right_child_i]));
185
186      const bool swap_with_l_child = !swap_with_r_child&&  smaller_than_left_child;
187
188      if (swap_with_l_child)
189        {
190	  std::swap(m_a_entries[i], m_a_entries[left_child_i]);
191
192	  i = left_child_i;
193        }
194      else if (swap_with_r_child)
195        {
196	  std::swap(m_a_entries[i], m_a_entries[right_child_i]);
197
198	  i = right_child_i;
199        }
200      else
201	i = m_size;
202    }
203}
204
205PB_DS_CLASS_T_DEC
206inline void
207PB_DS_CLASS_C_DEC::
208swap_value_imp(entry_pointer p_e, value_type new_val, true_type)
209{
210  * p_e = new_val;
211}
212
213PB_DS_CLASS_T_DEC
214inline void
215PB_DS_CLASS_C_DEC::
216swap_value_imp(entry_pointer p_e, const_reference r_new_val, false_type)
217{
218  value_type tmp(r_new_val);
219  (*p_e)->swap(tmp);
220}
221