1// -*- C++ -*-
2
3// Copyright (C) 2005, 2006, 2007, 2008, 2009 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
41PB_DS_CLASS_T_DEC
42PB_DS_CLASS_C_DEC::
43hash_standard_resize_policy()
44: m_size(Size_Policy::get_nearest_larger_size(1))
45{ trigger_policy_base::notify_externally_resized(m_size); }
46
47PB_DS_CLASS_T_DEC
48PB_DS_CLASS_C_DEC::
49hash_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
53PB_DS_CLASS_T_DEC
54PB_DS_CLASS_C_DEC::
55hash_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
61PB_DS_CLASS_T_DEC
62PB_DS_CLASS_C_DEC::
63~hash_standard_resize_policy()
64{ }
65
66PB_DS_CLASS_T_DEC
67void
68PB_DS_CLASS_C_DEC::
69swap(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
76PB_DS_CLASS_T_DEC
77inline void
78PB_DS_CLASS_C_DEC::
79notify_find_search_start()
80{ trigger_policy_base::notify_find_search_start(); }
81
82PB_DS_CLASS_T_DEC
83inline void
84PB_DS_CLASS_C_DEC::
85notify_find_search_collision()
86{ trigger_policy_base::notify_find_search_collision(); }
87
88PB_DS_CLASS_T_DEC
89inline void
90PB_DS_CLASS_C_DEC::
91notify_find_search_end()
92{ trigger_policy_base::notify_find_search_end(); }
93
94PB_DS_CLASS_T_DEC
95inline void
96PB_DS_CLASS_C_DEC::
97notify_insert_search_start()
98{ trigger_policy_base::notify_insert_search_start(); }
99
100PB_DS_CLASS_T_DEC
101inline void
102PB_DS_CLASS_C_DEC::
103notify_insert_search_collision()
104{ trigger_policy_base::notify_insert_search_collision(); }
105
106PB_DS_CLASS_T_DEC
107inline void
108PB_DS_CLASS_C_DEC::
109notify_insert_search_end()
110{ trigger_policy_base::notify_insert_search_end(); }
111
112PB_DS_CLASS_T_DEC
113inline void
114PB_DS_CLASS_C_DEC::
115notify_erase_search_start()
116{ trigger_policy_base::notify_erase_search_start(); }
117
118PB_DS_CLASS_T_DEC
119inline void
120PB_DS_CLASS_C_DEC::
121notify_erase_search_collision()
122{ trigger_policy_base::notify_erase_search_collision(); }
123
124PB_DS_CLASS_T_DEC
125inline void
126PB_DS_CLASS_C_DEC::
127notify_erase_search_end()
128{ trigger_policy_base::notify_erase_search_end(); }
129
130PB_DS_CLASS_T_DEC
131inline void
132PB_DS_CLASS_C_DEC::
133notify_inserted(size_type num_e)
134{ trigger_policy_base::notify_inserted(num_e); }
135
136PB_DS_CLASS_T_DEC
137inline void
138PB_DS_CLASS_C_DEC::
139notify_erased(size_type num_e)
140{ trigger_policy_base::notify_erased(num_e); }
141
142PB_DS_CLASS_T_DEC
143void
144PB_DS_CLASS_C_DEC::
145notify_cleared()
146{ trigger_policy_base::notify_cleared(); }
147
148PB_DS_CLASS_T_DEC
149inline bool
150PB_DS_CLASS_C_DEC::
151is_resize_needed() const
152{ return trigger_policy_base::is_resize_needed(); }
153
154PB_DS_CLASS_T_DEC
155typename PB_DS_CLASS_C_DEC::size_type
156PB_DS_CLASS_C_DEC::
157get_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
164PB_DS_CLASS_T_DEC
165void
166PB_DS_CLASS_C_DEC::
167notify_resized(size_type new_size)
168{
169  trigger_policy_base::notify_resized(new_size);
170  m_size = new_size;
171}
172
173PB_DS_CLASS_T_DEC
174inline typename PB_DS_CLASS_C_DEC::size_type
175PB_DS_CLASS_C_DEC::
176get_actual_size() const
177{
178  PB_DS_STATIC_ASSERT(access, external_size_access);
179  return m_size;
180}
181
182PB_DS_CLASS_T_DEC
183void
184PB_DS_CLASS_C_DEC::
185resize(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
218PB_DS_CLASS_T_DEC
219void
220PB_DS_CLASS_C_DEC::
221do_resize(size_type)
222{
223  // Do nothing
224}
225
226PB_DS_CLASS_T_DEC
227Trigger_Policy&
228PB_DS_CLASS_C_DEC::
229get_trigger_policy()
230{ return *this; }
231
232PB_DS_CLASS_T_DEC
233const Trigger_Policy&
234PB_DS_CLASS_C_DEC::
235get_trigger_policy() const
236{ return *this; }
237
238PB_DS_CLASS_T_DEC
239Size_Policy&
240PB_DS_CLASS_C_DEC::
241get_size_policy()
242{ return *this; }
243
244PB_DS_CLASS_T_DEC
245const Size_Policy&
246PB_DS_CLASS_C_DEC::
247get_size_policy() const
248{ return *this; }
249
250