libstdc++
hash_standard_resize_policy_imp.hpp
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1 // -*- C++ -*-
2 
3 // Copyright (C) 2005-2019 Free Software Foundation, Inc.
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16 // Under Section 7 of GPL version 3, you are granted additional
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18 // 3.1, as published by the Free Software Foundation.
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25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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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