insert_fn_imps.hpp revision 1.1.1.12 
1// -*- C++ -*-
2
3// Copyright (C) 2005-2022 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
41#ifdef PB_DS_CLASS_C_DEC
42
43PB_DS_CLASS_T_DEC
44inline typename PB_DS_CLASS_C_DEC::point_iterator
45PB_DS_CLASS_C_DEC::
46push(const_reference r_val)
47{
48  PB_DS_ASSERT_VALID((*this))
49  insert_value(r_val, s_no_throw_copies_ind);
50  push_heap();
51  PB_DS_ASSERT_VALID((*this))
52  return point_iterator(m_a_entries);
53}
54
55PB_DS_CLASS_T_DEC
56inline void
57PB_DS_CLASS_C_DEC::
58insert_value(value_type val, true_type)
59{
60  resize_for_insert_if_needed();
61  m_a_entries[m_size++] = val;
62}
63
64PB_DS_CLASS_T_DEC
65inline void
66PB_DS_CLASS_C_DEC::
67insert_value(const_reference r_val, false_type)
68{
69  resize_for_insert_if_needed();
70  pointer p_new = s_value_allocator.allocate(1);
71  cond_dealtor_t cond(p_new);
72  new (p_new) value_type(r_val);
73  cond.set_no_action();
74  m_a_entries[m_size++] = p_new;
75}
76
77PB_DS_CLASS_T_DEC
78inline void
79PB_DS_CLASS_C_DEC::
80resize_for_insert_if_needed()
81{
82  if (!resize_policy::resize_needed_for_grow(m_size))
83    {
84      _GLIBCXX_DEBUG_ASSERT(m_size < m_actual_size);
85      return;
86    }
87
88  const size_type new_size = resize_policy::get_new_size_for_grow();
89  entry_pointer new_entries = s_entry_allocator.allocate(new_size);
90  resize_policy::notify_grow_resize();
91
92  std::copy(m_a_entries, m_a_entries + m_size, new_entries);
93  s_entry_allocator.deallocate(m_a_entries, m_actual_size);
94  m_actual_size = new_size;
95  m_a_entries = new_entries;
96  make_heap();
97}
98
99PB_DS_CLASS_T_DEC
100void
101PB_DS_CLASS_C_DEC::
102modify(point_iterator it, const_reference r_new_val)
103{
104  PB_DS_ASSERT_VALID((*this))
105  swap_value_imp(it.m_p_e, r_new_val, s_no_throw_copies_ind);
106  fix(it.m_p_e);
107  PB_DS_ASSERT_VALID((*this))
108}
109
110PB_DS_CLASS_T_DEC
111void
112PB_DS_CLASS_C_DEC::
113fix(entry_pointer p_e)
114{
115  size_type i = p_e - m_a_entries;
116  if (i > 0 && entry_cmp::operator()(m_a_entries[parent(i)], m_a_entries[i]))
117    {
118      size_type parent_i = parent(i);
119      while (i > 0
120	     && entry_cmp::operator()(m_a_entries[parent_i], m_a_entries[i]))
121	{
122	  std::swap(m_a_entries[i], m_a_entries[parent_i]);
123	  i = parent_i;
124	  parent_i = parent(i);
125	}
126
127      PB_DS_ASSERT_VALID((*this))
128      return;
129    }
130
131  while (i < m_size)
132    {
133      const size_type lchild_i = left_child(i);
134      const size_type rchild_i = right_child(i);
135      _GLIBCXX_DEBUG_ASSERT(rchild_i > lchild_i);
136
137      const bool smaller_than_lchild = lchild_i < m_size &&
138	entry_cmp::operator()(m_a_entries[i], m_a_entries[lchild_i]);
139
140      const bool smaller_than_rchild = rchild_i < m_size &&
141	entry_cmp::operator()(m_a_entries[i], m_a_entries[rchild_i]);
142
143      const bool swap_with_rchild = smaller_than_rchild && (!smaller_than_lchild || entry_cmp::operator()(m_a_entries[lchild_i], m_a_entries[rchild_i]));
144
145      const bool swap_with_lchild = !swap_with_rchild && smaller_than_lchild;
146
147      if (swap_with_lchild)
148	{
149	  std::swap(m_a_entries[i], m_a_entries[lchild_i]);
150	  i = lchild_i;
151	}
152      else if (swap_with_rchild)
153	{
154	  std::swap(m_a_entries[i], m_a_entries[rchild_i]);
155	  i = rchild_i;
156	}
157      else
158	i = m_size;
159    }
160}
161
162PB_DS_CLASS_T_DEC
163inline void
164PB_DS_CLASS_C_DEC::
165swap_value_imp(entry_pointer p_e, value_type new_val, true_type)
166{ *p_e = new_val; }
167
168PB_DS_CLASS_T_DEC
169inline void
170PB_DS_CLASS_C_DEC::
171swap_value_imp(entry_pointer p_e, const_reference r_new_val, false_type)
172{
173  value_type tmp(r_new_val);
174  (*p_e)->swap(tmp);
175}
176#endif
177