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4569a895 AT |
1 | // -*- C++ -*- |
2 | ||
85ec4feb | 3 | // Copyright (C) 2005-2018 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 cc_hash_max_collision_check_resize_trigger_imp.hpp | |
38 | * Contains a resize trigger implementation. | |
39 | */ | |
40 | ||
4569a895 AT |
41 | PB_DS_CLASS_T_DEC |
42 | PB_DS_CLASS_C_DEC:: | |
43 | cc_hash_max_collision_check_resize_trigger(float load) : | |
44 | m_load(load), | |
45 | m_size(0), | |
46 | m_num_col(0), | |
47 | m_max_col(0), | |
48 | m_resize_needed(false) | |
49 | { } | |
50 | ||
51 | PB_DS_CLASS_T_DEC | |
52 | inline void | |
53 | PB_DS_CLASS_C_DEC:: | |
54 | notify_find_search_start() | |
55 | { } | |
56 | ||
57 | PB_DS_CLASS_T_DEC | |
58 | inline void | |
59 | PB_DS_CLASS_C_DEC:: | |
60 | notify_find_search_collision() | |
61 | { } | |
62 | ||
63 | PB_DS_CLASS_T_DEC | |
64 | inline void | |
65 | PB_DS_CLASS_C_DEC:: | |
66 | notify_find_search_end() | |
67 | { } | |
68 | ||
69 | PB_DS_CLASS_T_DEC | |
70 | inline void | |
71 | PB_DS_CLASS_C_DEC:: | |
72 | notify_insert_search_start() | |
d7f245b1 | 73 | { m_num_col = 0; } |
4569a895 AT |
74 | |
75 | PB_DS_CLASS_T_DEC | |
76 | inline void | |
77 | PB_DS_CLASS_C_DEC:: | |
78 | notify_insert_search_collision() | |
d7f245b1 | 79 | { ++m_num_col; } |
4569a895 AT |
80 | |
81 | PB_DS_CLASS_T_DEC | |
82 | inline void | |
83 | PB_DS_CLASS_C_DEC:: | |
84 | notify_insert_search_end() | |
d7f245b1 | 85 | { calc_resize_needed(); } |
4569a895 AT |
86 | |
87 | PB_DS_CLASS_T_DEC | |
88 | inline void | |
89 | PB_DS_CLASS_C_DEC:: | |
90 | notify_erase_search_start() | |
91 | { } | |
92 | ||
93 | PB_DS_CLASS_T_DEC | |
94 | inline void | |
95 | PB_DS_CLASS_C_DEC:: | |
96 | notify_erase_search_collision() | |
97 | { } | |
98 | ||
99 | PB_DS_CLASS_T_DEC | |
100 | inline void | |
101 | PB_DS_CLASS_C_DEC:: | |
102 | notify_erase_search_end() | |
103 | { } | |
104 | ||
105 | PB_DS_CLASS_T_DEC | |
106 | inline void | |
107 | PB_DS_CLASS_C_DEC:: | |
d7f245b1 | 108 | notify_inserted(size_type) |
4569a895 AT |
109 | { } |
110 | ||
111 | PB_DS_CLASS_T_DEC | |
112 | inline void | |
113 | PB_DS_CLASS_C_DEC:: | |
d7f245b1 BK |
114 | notify_erased(size_type) |
115 | { m_resize_needed = true; } | |
4569a895 AT |
116 | |
117 | PB_DS_CLASS_T_DEC | |
118 | void | |
119 | PB_DS_CLASS_C_DEC:: | |
120 | notify_cleared() | |
d7f245b1 | 121 | { m_resize_needed = false; } |
4569a895 AT |
122 | |
123 | PB_DS_CLASS_T_DEC | |
124 | inline bool | |
125 | PB_DS_CLASS_C_DEC:: | |
126 | is_resize_needed() const | |
d7f245b1 | 127 | { return m_resize_needed; } |
4569a895 AT |
128 | |
129 | PB_DS_CLASS_T_DEC | |
130 | inline bool | |
131 | PB_DS_CLASS_C_DEC:: | |
132 | is_grow_needed(size_type /*size*/, size_type /*num_used_e*/) const | |
d7f245b1 | 133 | { return m_num_col >= m_max_col; } |
4569a895 AT |
134 | |
135 | PB_DS_CLASS_T_DEC | |
136 | void | |
137 | PB_DS_CLASS_C_DEC:: | |
138 | notify_resized(size_type new_size) | |
139 | { | |
140 | m_size = new_size; | |
141 | ||
142 | #ifdef PB_DS_HT_MAP_RESIZE_TRACE_ | |
d7f245b1 BK |
143 | std::cerr << "chmccrt::notify_resized " |
144 | << static_cast<unsigned long>(new_size) << std::endl; | |
145 | #endif | |
4569a895 AT |
146 | |
147 | calc_max_num_coll(); | |
4569a895 | 148 | calc_resize_needed(); |
4569a895 AT |
149 | m_num_col = 0; |
150 | } | |
151 | ||
152 | PB_DS_CLASS_T_DEC | |
153 | void | |
154 | PB_DS_CLASS_C_DEC:: | |
155 | calc_max_num_coll() | |
156 | { | |
157 | // max_col <-- \sqrt{2 load \ln( 2 m \ln( m ) ) } | |
113008b5 BK |
158 | const double ln_arg = 2 * m_size * std::log(double(m_size)); |
159 | m_max_col = size_type(std::ceil(std::sqrt(2 * m_load * std::log(ln_arg)))); | |
4569a895 AT |
160 | |
161 | #ifdef PB_DS_HT_MAP_RESIZE_TRACE_ | |
d7f245b1 BK |
162 | std::cerr << "chmccrt::calc_max_num_coll " |
163 | << static_cast<unsigned long>(m_size) << " " | |
164 | << static_cast<unsigned long>(m_max_col) << std::endl; | |
165 | #endif | |
4569a895 AT |
166 | } |
167 | ||
168 | PB_DS_CLASS_T_DEC | |
169 | void | |
170 | PB_DS_CLASS_C_DEC:: | |
171 | notify_externally_resized(size_type new_size) | |
d7f245b1 | 172 | { notify_resized(new_size); } |
4569a895 AT |
173 | |
174 | PB_DS_CLASS_T_DEC | |
175 | void | |
176 | PB_DS_CLASS_C_DEC:: | |
177 | swap(PB_DS_CLASS_C_DEC& other) | |
178 | { | |
179 | std::swap(m_load, other.m_load); | |
4569a895 | 180 | std::swap(m_size, other.m_size); |
4569a895 | 181 | std::swap(m_num_col, other.m_num_col); |
4569a895 | 182 | std::swap(m_max_col, other.m_max_col); |
4569a895 AT |
183 | std::swap(m_resize_needed, other.m_resize_needed); |
184 | } | |
185 | ||
186 | PB_DS_CLASS_T_DEC | |
187 | inline float | |
188 | PB_DS_CLASS_C_DEC:: | |
189 | get_load() const | |
190 | { | |
191 | PB_DS_STATIC_ASSERT(access, external_load_access); | |
d7f245b1 | 192 | return m_load; |
4569a895 AT |
193 | } |
194 | ||
195 | PB_DS_CLASS_T_DEC | |
196 | inline void | |
197 | PB_DS_CLASS_C_DEC:: | |
198 | calc_resize_needed() | |
d7f245b1 | 199 | { m_resize_needed = m_resize_needed || m_num_col >= m_max_col; } |
4569a895 AT |
200 | |
201 | PB_DS_CLASS_T_DEC | |
202 | void | |
203 | PB_DS_CLASS_C_DEC:: | |
204 | set_load(float load) | |
205 | { | |
206 | PB_DS_STATIC_ASSERT(access, external_load_access); | |
4569a895 | 207 | m_load = load; |
4569a895 | 208 | calc_max_num_coll(); |
4569a895 AT |
209 | calc_resize_needed(); |
210 | } | |
211 |