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   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2019 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 cc_hash_max_collision_check_resize_trigger_imp.hpp
  38  * Contains a resize trigger implementation.
  39  */
  40
  41 PB_DS_CLASS_T_DEC
  42 PB_DS_CLASS_C_DEC::
  43 cc_hash_max_collision_check_resize_trigger(float load) :
  44   m_load(load),
  45   m_size(0),
  46   m_num_col(0),
  47   m_max_col(0),
  48   m_resize_needed(false)
  49 { }
  50
  51 PB_DS_CLASS_T_DEC
  52 inline void
  53 PB_DS_CLASS_C_DEC::
  54 notify_find_search_start()
  55 { }
  56
  57 PB_DS_CLASS_T_DEC
  58 inline void
  59 PB_DS_CLASS_C_DEC::
  60 notify_find_search_collision()
  61 { }
  62
  63 PB_DS_CLASS_T_DEC
  64 inline void
  65 PB_DS_CLASS_C_DEC::
  66 notify_find_search_end()
  67 { }
  68
  69 PB_DS_CLASS_T_DEC
  70 inline void
  71 PB_DS_CLASS_C_DEC::
  72 notify_insert_search_start()
  73 { m_num_col = 0; }
  74
  75 PB_DS_CLASS_T_DEC
  76 inline void
  77 PB_DS_CLASS_C_DEC::
  78 notify_insert_search_collision()
  79 { ++m_num_col; }
  80
  81 PB_DS_CLASS_T_DEC
  82 inline void
  83 PB_DS_CLASS_C_DEC::
  84 notify_insert_search_end()
  85 { calc_resize_needed(); }
  86
  87 PB_DS_CLASS_T_DEC
  88 inline void
  89 PB_DS_CLASS_C_DEC::
  90 notify_erase_search_start()
  91 { }
  92
  93 PB_DS_CLASS_T_DEC
  94 inline void
  95 PB_DS_CLASS_C_DEC::
  96 notify_erase_search_collision()
  97 { }
  98
  99 PB_DS_CLASS_T_DEC
 100 inline void
 101 PB_DS_CLASS_C_DEC::
 102 notify_erase_search_end()
 103 { }
 104
 105 PB_DS_CLASS_T_DEC
 106 inline void
 107 PB_DS_CLASS_C_DEC::
 108 notify_inserted(size_type)
 109 { }
 110
 111 PB_DS_CLASS_T_DEC
 112 inline void
 113 PB_DS_CLASS_C_DEC::
 114 notify_erased(size_type)
 115 { m_resize_needed = true; }
 116
 117 PB_DS_CLASS_T_DEC
 118 void
 119 PB_DS_CLASS_C_DEC::
 120 notify_cleared()
 121 { m_resize_needed = false; }
 122
 123 PB_DS_CLASS_T_DEC
 124 inline bool
 125 PB_DS_CLASS_C_DEC::
 126 is_resize_needed() const
 127 { return m_resize_needed; }
 128
 129 PB_DS_CLASS_T_DEC
 130 inline bool
 131 PB_DS_CLASS_C_DEC::
 132 is_grow_needed(size_type /*size*/, size_type /*num_used_e*/) const
 133 { return m_num_col >= m_max_col; }
 134
 135 PB_DS_CLASS_T_DEC
 136 void
 137 PB_DS_CLASS_C_DEC::
 138 notify_resized(size_type new_size)
 139 {
 140   m_size = new_size;
 141
 142 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_
 143   std::cerr << "chmccrt::notify_resized "
 144             << static_cast<unsigned long>(new_size) << std::endl;
 145 #endif
 146
 147   calc_max_num_coll();
 148   calc_resize_needed();
 149   m_num_col = 0;
 150 }
 151
 152 PB_DS_CLASS_T_DEC
 153 void
 154 PB_DS_CLASS_C_DEC::
 155 calc_max_num_coll()
 156 {
 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))));
 160
 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;
 165 #endif
 166 }
 167
 168 PB_DS_CLASS_T_DEC
 169 void
 170 PB_DS_CLASS_C_DEC::
 171 notify_externally_resized(size_type new_size)
 172 { notify_resized(new_size); }
 173
 174 PB_DS_CLASS_T_DEC
 175 void
 176 PB_DS_CLASS_C_DEC::
 177 swap(PB_DS_CLASS_C_DEC& other)
 178 {
 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);
 184 }
 185
 186 PB_DS_CLASS_T_DEC
 187 inline float
 188 PB_DS_CLASS_C_DEC::
 189 get_load() const
 190 {
 191   PB_DS_STATIC_ASSERT(access, external_load_access);
 192   return m_load;
 193 }
 194
 195 PB_DS_CLASS_T_DEC
 196 inline void
 197 PB_DS_CLASS_C_DEC::
 198 calc_resize_needed()
 199 { m_resize_needed = m_resize_needed || m_num_col >= m_max_col; }
 200
 201 PB_DS_CLASS_T_DEC
 202 void
 203 PB_DS_CLASS_C_DEC::
 204 set_load(float load)
 205 {
 206   PB_DS_STATIC_ASSERT(access, external_load_access);
 207   m_load = load;
 208   calc_max_num_coll();
 209   calc_resize_needed();
 210 }
 211