libstdc++: hash_exponential_size_policy_imp.hpp Source File

libstdc++

hash_exponential_size_policy_imp.hpp
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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
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34// warranty.
35
36/**
37 * @file hash_exponential_size_policy_imp.hpp
38 * Contains a resize size policy implementation.
39 */
40
41#ifdef PB_DS_CLASS_C_DEC
42
43PB_DS_CLASS_T_DEC
44PB_DS_CLASS_C_DEC::
45hash_exponential_size_policy(size_type start_size, size_type grow_factor) :
46 m_start_size(start_size),
47 m_grow_factor(grow_factor)
48{ }
49
50PB_DS_CLASS_T_DEC
51void
52PB_DS_CLASS_C_DEC::
53swap(PB_DS_CLASS_C_DEC& other)
54{
55 std::swap(m_start_size, other.m_start_size);
56 std::swap(m_grow_factor, other.m_grow_factor);
57}
58
59PB_DS_CLASS_T_DEC
60typename PB_DS_CLASS_C_DEC::size_type
61PB_DS_CLASS_C_DEC::
62get_nearest_larger_size(size_type size) const
63{
64 size_type ret = m_start_size;
65 while (ret <= size)
66 {
67 const size_type next_ret = ret* m_grow_factor;
68 if (next_ret < ret)
69 __throw_insert_error();
70 ret = next_ret;
71 }
72 return ret;
73}
74
75PB_DS_CLASS_T_DEC
76typename PB_DS_CLASS_C_DEC::size_type
77PB_DS_CLASS_C_DEC::
78get_nearest_smaller_size(size_type size) const
79{
80 size_type ret = m_start_size;
81 while (true)
82 {
83 const size_type next_ret = ret* m_grow_factor;
84 if (next_ret < ret)
85 __throw_resize_error();
86 if (next_ret >= size)
87 return (ret);
88 ret = next_ret;
89 }
90 return ret;
91}
92
93#endif