3 // Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
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
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.
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.
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/>.
25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
27 // Permission to use, copy, modify, sell, and distribute this software
28 // is hereby granted without fee, provided that the above copyright
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32 // representation about the suitability of this software for any
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37 * @file cc_hash_max_collision_check_resize_trigger_imp.hpp
38 * Contains a resize trigger implementation.
43 cc_hash_max_collision_check_resize_trigger(float load
) :
48 m_resize_needed(false)
54 notify_find_search_start()
60 notify_find_search_collision()
66 notify_find_search_end()
72 notify_insert_search_start()
78 notify_insert_search_collision()
84 notify_insert_search_end()
85 { calc_resize_needed(); }
90 notify_erase_search_start()
96 notify_erase_search_collision()
102 notify_erase_search_end()
108 notify_inserted(size_type
)
114 notify_erased(size_type
)
115 { m_resize_needed
= true; }
121 { m_resize_needed
= false; }
126 is_resize_needed() const
127 { return m_resize_needed
; }
132 is_grow_needed(size_type
/*size*/, size_type
/*num_used_e*/) const
133 { return m_num_col
>= m_max_col
; }
138 notify_resized(size_type new_size
)
142 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_
143 std::cerr
<< "chmccrt::notify_resized "
144 << static_cast<unsigned long>(new_size
) << std::endl
;
148 calc_resize_needed();
157 // max_col <-- \sqrt{2 load \ln( 2 m \ln( m ) ) }
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
))));
161 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_
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
;
171 notify_externally_resized(size_type new_size
)
172 { notify_resized(new_size
); }
177 swap(PB_DS_CLASS_C_DEC
& other
)
179 std::swap(m_load
, other
.m_load
);
180 std::swap(m_size
, other
.m_size
);
181 std::swap(m_num_col
, other
.m_num_col
);
182 std::swap(m_max_col
, other
.m_max_col
);
183 std::swap(m_resize_needed
, other
.m_resize_needed
);
191 PB_DS_STATIC_ASSERT(access
, external_load_access
);
199 { m_resize_needed
= m_resize_needed
|| m_num_col
>= m_max_col
; }
206 PB_DS_STATIC_ASSERT(access
, external_load_access
);
209 calc_resize_needed();