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4569a895 AT |
1 | // -*- C++ -*- |
2 | ||
748086b7 | 3 | // Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc. |
4569a895 AT |
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 | |
748086b7 | 8 | // Foundation; either version 3, or (at your option) any later |
4569a895 AT |
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 | ||
748086b7 JJ |
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/>. | |
4569a895 AT |
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 hash_exponential_size_policy_imp.hpp | |
38 | * Contains a resize size policy implementation. | |
39 | */ | |
40 | ||
41 | PB_DS_CLASS_T_DEC | |
42 | PB_DS_CLASS_C_DEC:: | |
43 | hash_exponential_size_policy(size_type start_size, size_type grow_factor) : | |
44 | m_start_size(start_size), | |
45 | m_grow_factor(grow_factor) | |
46 | { } | |
47 | ||
48 | PB_DS_CLASS_T_DEC | |
49 | void | |
50 | PB_DS_CLASS_C_DEC:: | |
51 | swap(PB_DS_CLASS_C_DEC& other) | |
52 | { | |
53 | std::swap(m_start_size, other.m_start_size); | |
4569a895 AT |
54 | std::swap(m_grow_factor, other.m_grow_factor); |
55 | } | |
56 | ||
57 | PB_DS_CLASS_T_DEC | |
58 | typename PB_DS_CLASS_C_DEC::size_type | |
59 | PB_DS_CLASS_C_DEC:: | |
60 | get_nearest_larger_size(size_type size) const | |
61 | { | |
62 | size_type ret = m_start_size; | |
4569a895 AT |
63 | while (ret <= size) |
64 | { | |
65 | const size_type next_ret = ret* m_grow_factor; | |
4569a895 | 66 | if (next_ret < ret) |
8fafc2d3 | 67 | __throw_insert_error(); |
4569a895 AT |
68 | ret = next_ret; |
69 | } | |
d7f245b1 | 70 | return ret; |
4569a895 AT |
71 | } |
72 | ||
73 | PB_DS_CLASS_T_DEC | |
74 | typename PB_DS_CLASS_C_DEC::size_type | |
75 | PB_DS_CLASS_C_DEC:: | |
76 | get_nearest_smaller_size(size_type size) const | |
77 | { | |
78 | size_type ret = m_start_size; | |
4569a895 AT |
79 | while (true) |
80 | { | |
81 | const size_type next_ret = ret* m_grow_factor; | |
4569a895 | 82 | if (next_ret < ret) |
8fafc2d3 | 83 | __throw_resize_error(); |
4569a895 AT |
84 | if (next_ret >= size) |
85 | return (ret); | |
4569a895 AT |
86 | ret = next_ret; |
87 | } | |
d7f245b1 | 88 | return ret; |
4569a895 AT |
89 | } |
90 |