libstdc++

hash_standard_resize_policy_imp.hpp
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1 // -*- C++ -*-
2
3 // Copyright (C) 2005-2013 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 hash_standard_resize_policy_imp.hpp
38 * Contains a resize policy implementation.
39 */
40
41 PB_DS_CLASS_T_DEC
42 PB_DS_CLASS_C_DEC::
43 hash_standard_resize_policy()
44 : m_size(Size_Policy::get_nearest_larger_size(1))
45 { trigger_policy_base::notify_externally_resized(m_size); }
46
47 PB_DS_CLASS_T_DEC
48 PB_DS_CLASS_C_DEC::
49 hash_standard_resize_policy(const Size_Policy& r_size_policy)
50 : Size_Policy(r_size_policy), m_size(Size_Policy::get_nearest_larger_size(1))
51 { trigger_policy_base::notify_externally_resized(m_size); }
52
53 PB_DS_CLASS_T_DEC
54 PB_DS_CLASS_C_DEC::
55 hash_standard_resize_policy(const Size_Policy& r_size_policy,
56 const Trigger_Policy& r_trigger_policy)
57 : Size_Policy(r_size_policy), Trigger_Policy(r_trigger_policy),
58 m_size(Size_Policy::get_nearest_larger_size(1))
59 { trigger_policy_base::notify_externally_resized(m_size); }
60
61 PB_DS_CLASS_T_DEC
62 PB_DS_CLASS_C_DEC::
63 ~hash_standard_resize_policy()
64 { }
65
66 PB_DS_CLASS_T_DEC
67 void
68 PB_DS_CLASS_C_DEC::
69 swap(PB_DS_CLASS_C_DEC& other)
70 {
71 trigger_policy_base::swap(other);
72 size_policy_base::swap(other);
73 std::swap(m_size, other.m_size);
74 }
75
76 PB_DS_CLASS_T_DEC
77 inline void
78 PB_DS_CLASS_C_DEC::
79 notify_find_search_start()
80 { trigger_policy_base::notify_find_search_start(); }
81
82 PB_DS_CLASS_T_DEC
83 inline void
84 PB_DS_CLASS_C_DEC::
85 notify_find_search_collision()
86 { trigger_policy_base::notify_find_search_collision(); }
87
88 PB_DS_CLASS_T_DEC
89 inline void
90 PB_DS_CLASS_C_DEC::
91 notify_find_search_end()
92 { trigger_policy_base::notify_find_search_end(); }
93
94 PB_DS_CLASS_T_DEC
95 inline void
96 PB_DS_CLASS_C_DEC::
97 notify_insert_search_start()
98 { trigger_policy_base::notify_insert_search_start(); }
99
100 PB_DS_CLASS_T_DEC
101 inline void
102 PB_DS_CLASS_C_DEC::
103 notify_insert_search_collision()
104 { trigger_policy_base::notify_insert_search_collision(); }
105
106 PB_DS_CLASS_T_DEC
107 inline void
108 PB_DS_CLASS_C_DEC::
109 notify_insert_search_end()
110 { trigger_policy_base::notify_insert_search_end(); }
111
112 PB_DS_CLASS_T_DEC
113 inline void
114 PB_DS_CLASS_C_DEC::
115 notify_erase_search_start()
116 { trigger_policy_base::notify_erase_search_start(); }
117
118 PB_DS_CLASS_T_DEC
119 inline void
120 PB_DS_CLASS_C_DEC::
121 notify_erase_search_collision()
122 { trigger_policy_base::notify_erase_search_collision(); }
123
124 PB_DS_CLASS_T_DEC
125 inline void
126 PB_DS_CLASS_C_DEC::
127 notify_erase_search_end()
128 { trigger_policy_base::notify_erase_search_end(); }
129
130 PB_DS_CLASS_T_DEC
131 inline void
132 PB_DS_CLASS_C_DEC::
133 notify_inserted(size_type num_e)
134 { trigger_policy_base::notify_inserted(num_e); }
135
136 PB_DS_CLASS_T_DEC
137 inline void
138 PB_DS_CLASS_C_DEC::
139 notify_erased(size_type num_e)
140 { trigger_policy_base::notify_erased(num_e); }
141
142 PB_DS_CLASS_T_DEC
143 void
144 PB_DS_CLASS_C_DEC::
145 notify_cleared()
146 { trigger_policy_base::notify_cleared(); }
147
148 PB_DS_CLASS_T_DEC
149 inline bool
150 PB_DS_CLASS_C_DEC::
151 is_resize_needed() const
152 { return trigger_policy_base::is_resize_needed(); }
153
154 PB_DS_CLASS_T_DEC
155 typename PB_DS_CLASS_C_DEC::size_type
156 PB_DS_CLASS_C_DEC::
157 get_new_size(size_type size, size_type num_used_e) const
158 {
159 if (trigger_policy_base::is_grow_needed(size, num_used_e))
160 return size_policy_base::get_nearest_larger_size(size);
161 return size_policy_base::get_nearest_smaller_size(size);
162 }
163
164 PB_DS_CLASS_T_DEC
165 void
166 PB_DS_CLASS_C_DEC::
167 notify_resized(size_type new_size)
168 {
169 trigger_policy_base::notify_resized(new_size);
170 m_size = new_size;
171 }
172
173 PB_DS_CLASS_T_DEC
174 inline typename PB_DS_CLASS_C_DEC::size_type
175 PB_DS_CLASS_C_DEC::
176 get_actual_size() const
177 {
178 PB_DS_STATIC_ASSERT(access, external_size_access);
179 return m_size;
180 }
181
182 PB_DS_CLASS_T_DEC
183 void
184 PB_DS_CLASS_C_DEC::
185 resize(size_type new_size)
186 {
187 PB_DS_STATIC_ASSERT(access, external_size_access);
188 size_type actual_size = size_policy_base::get_nearest_larger_size(1);
189 while (actual_size < new_size)
190 {
191 const size_type pot = size_policy_base::get_nearest_larger_size(actual_size);
192
193 if (pot == actual_size && pot < new_size)
194 __throw_resize_error();
195 actual_size = pot;
196 }
197
198 if (actual_size > 0)
199 --actual_size;
200
201 const size_type old_size = m_size;
202 __try
203 {
204 do_resize(actual_size - 1);
205 }
206 __catch(insert_error& )
207 {
208 m_size = old_size;
209 __throw_resize_error();
210 }
211 __catch(...)
212 {
213 m_size = old_size;
214 __throw_exception_again;
215 }
216 }
217
218 PB_DS_CLASS_T_DEC
219 void
220 PB_DS_CLASS_C_DEC::
221 do_resize(size_type)
222 {
223 // Do nothing
224 }
225
226 PB_DS_CLASS_T_DEC
227 Trigger_Policy&
228 PB_DS_CLASS_C_DEC::
229 get_trigger_policy()
230 { return *this; }
231
232 PB_DS_CLASS_T_DEC
233 const Trigger_Policy&
234 PB_DS_CLASS_C_DEC::
235 get_trigger_policy() const
236 { return *this; }
237
238 PB_DS_CLASS_T_DEC
239 Size_Policy&
240 PB_DS_CLASS_C_DEC::
241 get_size_policy()
242 { return *this; }
243
244 PB_DS_CLASS_T_DEC
245 const Size_Policy&
246 PB_DS_CLASS_C_DEC::
247 get_size_policy() const
248 { return *this; }
249