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   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006 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 2, 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 // You should have received a copy of the GNU General Public License
  17 // along with this library; see the file COPYING.  If not, write to
  18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  19 // MA 02111-1307, USA.
  20
  21 // As a special exception, you may use this file as part of a free
  22 // software library without restriction.  Specifically, if other files
  23 // instantiate templates or use macros or inline functions from this
  24 // file, or you compile this file and link it with other files to
  25 // produce an executable, this file does not by itself cause the
  26 // resulting executable to be covered by the GNU General Public
  27 // License.  This exception does not however invalidate any other
  28 // reasons why the executable file might be covered by the GNU General
  29 // Public License.
  30
  31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  32
  33 // Permission to use, copy, modify, sell, and distribute this software
  34 // is hereby granted without fee, provided that the above copyright
  35 // notice appears in all copies, and that both that copyright notice
  36 // and this permission notice appear in supporting documentation. None
  37 // of the above authors, nor IBM Haifa Research Laboratories, make any
  38 // representation about the suitability of this software for any
  39 // purpose. It is provided "as is" without express or implied
  40 // warranty.
  41
  42 /**
  43  * @file cc_hash_max_collision_check_resize_trigger_imp.hpp
  44  * Contains a resize trigger implementation.
  45  */
  46
  47 #define PB_DS_STATIC_ASSERT(UNIQUE, E)                                  \
  48   typedef detail::static_assert_dumclass<sizeof(detail::static_assert<(bool)(E)>)> \
  49   UNIQUE##static_assert_type
  50
  51 PB_DS_CLASS_T_DEC
  52 PB_DS_CLASS_C_DEC::
  53 cc_hash_max_collision_check_resize_trigger(float load) :
  54   m_load(load),
  55   m_size(0),
  56   m_num_col(0),
  57   m_max_col(0),
  58   m_resize_needed(false)
  59 { }
  60
  61 PB_DS_CLASS_T_DEC
  62 inline void
  63 PB_DS_CLASS_C_DEC::
  64 notify_find_search_start()
  65 { }
  66
  67 PB_DS_CLASS_T_DEC
  68 inline void
  69 PB_DS_CLASS_C_DEC::
  70 notify_find_search_collision()
  71 { }
  72
  73 PB_DS_CLASS_T_DEC
  74 inline void
  75 PB_DS_CLASS_C_DEC::
  76 notify_find_search_end()
  77 { }
  78
  79 PB_DS_CLASS_T_DEC
  80 inline void
  81 PB_DS_CLASS_C_DEC::
  82 notify_insert_search_start()
  83 {
  84   m_num_col = 0;
  85 }
  86
  87 PB_DS_CLASS_T_DEC
  88 inline void
  89 PB_DS_CLASS_C_DEC::
  90 notify_insert_search_collision()
  91 {
  92   ++m_num_col;
  93 }
  94
  95 PB_DS_CLASS_T_DEC
  96 inline void
  97 PB_DS_CLASS_C_DEC::
  98 notify_insert_search_end()
  99 {
 100   calc_resize_needed();
 101 }
 102
 103 PB_DS_CLASS_T_DEC
 104 inline void
 105 PB_DS_CLASS_C_DEC::
 106 notify_erase_search_start()
 107 { }
 108
 109 PB_DS_CLASS_T_DEC
 110 inline void
 111 PB_DS_CLASS_C_DEC::
 112 notify_erase_search_collision()
 113 { }
 114
 115 PB_DS_CLASS_T_DEC
 116 inline void
 117 PB_DS_CLASS_C_DEC::
 118 notify_erase_search_end()
 119 { }
 120
 121 PB_DS_CLASS_T_DEC
 122 inline void
 123 PB_DS_CLASS_C_DEC::
 124 notify_inserted(size_type /*num_e*/)
 125 { }
 126
 127 PB_DS_CLASS_T_DEC
 128 inline void
 129 PB_DS_CLASS_C_DEC::
 130 notify_erased(size_type /*num_e*/)
 131 {
 132   m_resize_needed = true;
 133 }
 134
 135 PB_DS_CLASS_T_DEC
 136 void
 137 PB_DS_CLASS_C_DEC::
 138 notify_cleared()
 139 {
 140   m_resize_needed = false;
 141 }
 142
 143 PB_DS_CLASS_T_DEC
 144 inline bool
 145 PB_DS_CLASS_C_DEC::
 146 is_resize_needed() const
 147 {
 148   return (m_resize_needed);
 149 }
 150
 151 PB_DS_CLASS_T_DEC
 152 inline bool
 153 PB_DS_CLASS_C_DEC::
 154 is_grow_needed(size_type /*size*/, size_type /*num_used_e*/) const
 155 {
 156   return (m_num_col >= m_max_col);
 157 }
 158
 159 PB_DS_CLASS_T_DEC
 160 void
 161 PB_DS_CLASS_C_DEC::
 162 notify_resized(size_type new_size)
 163 {
 164   m_size = new_size;
 165
 166 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_
 167   std::cerr << "chmccrt::notify_resized " <<
 168     static_cast<unsigned long>(new_size) << std::endl;
 169 #endif // #ifdef PB_DS_HT_MAP_RESIZE_TRACE_
 170
 171   calc_max_num_coll();
 172
 173   calc_resize_needed();
 174
 175   m_num_col = 0;
 176 }
 177
 178 PB_DS_CLASS_T_DEC
 179 void
 180 PB_DS_CLASS_C_DEC::
 181 calc_max_num_coll()
 182 {
 183   // max_col <-- \sqrt{2 load \ln( 2 m \ln( m ) ) }
 184
 185   const double ln_arg = 2*  m_size*  ::log( (double)m_size);
 186
 187   m_max_col =(size_type)::ceil(    ::sqrt(2*     m_load*  ::log(ln_arg) ) );
 188
 189 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_
 190   std::cerr << "chmccrt::calc_max_num_coll " <<
 191     static_cast<unsigned long>(m_size) <<    "    " <<
 192     static_cast<unsigned long>(m_max_col) << std::endl;
 193 #endif // #ifdef PB_DS_HT_MAP_RESIZE_TRACE_
 194 }
 195
 196 PB_DS_CLASS_T_DEC
 197 void
 198 PB_DS_CLASS_C_DEC::
 199 notify_externally_resized(size_type new_size)
 200 {
 201   notify_resized(new_size);
 202 }
 203
 204 PB_DS_CLASS_T_DEC
 205 void
 206 PB_DS_CLASS_C_DEC::
 207 swap(PB_DS_CLASS_C_DEC& other)
 208 {
 209   std::swap(m_load, other.m_load);
 210
 211   std::swap(m_size, other.m_size);
 212
 213   std::swap(m_num_col, other.m_num_col);
 214
 215   std::swap(m_max_col, other.m_max_col);
 216
 217   std::swap(m_resize_needed, other.m_resize_needed);
 218 }
 219
 220 PB_DS_CLASS_T_DEC
 221 inline float
 222 PB_DS_CLASS_C_DEC::
 223 get_load() const
 224 {
 225   PB_DS_STATIC_ASSERT(access, external_load_access);
 226
 227   return (m_load);
 228 }
 229
 230 PB_DS_CLASS_T_DEC
 231 inline void
 232 PB_DS_CLASS_C_DEC::
 233 calc_resize_needed()
 234 {
 235   m_resize_needed =
 236     m_resize_needed || m_num_col >= m_max_col;
 237 }
 238
 239 PB_DS_CLASS_T_DEC
 240 void
 241 PB_DS_CLASS_C_DEC::
 242 set_load(float load)
 243 {
 244   PB_DS_STATIC_ASSERT(access, external_load_access);
 245
 246   m_load = load;
 247
 248   calc_max_num_coll();
 249
 250   calc_resize_needed();
 251 }
 252
 253 #undef PB_DS_STATIC_ASSERT