mingw/lib/gcc/mingw32/4.4.0/include/c++/ext/pb_ds/detail/resize_policy/hash_load_check_resize_trigger_imp.hpp

   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_load_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 hash_load_check_resize_trigger(float load_min, float load_max)
  44 : m_load_min(load_min), m_load_max(load_max), m_next_shrink_size(0),
  45   m_next_grow_size(0), m_resize_needed(false)
  46 { _GLIBCXX_DEBUG_ONLY(assert_valid();) }
  47
  48 PB_DS_CLASS_T_DEC
  49 inline void
  50 PB_DS_CLASS_C_DEC::
  51 notify_find_search_start()
  52 { _GLIBCXX_DEBUG_ONLY(assert_valid();) }
  53
  54 PB_DS_CLASS_T_DEC
  55 inline void
  56 PB_DS_CLASS_C_DEC::
  57 notify_find_search_collision()
  58 { _GLIBCXX_DEBUG_ONLY(assert_valid();) }
  59
  60 PB_DS_CLASS_T_DEC
  61 inline void
  62 PB_DS_CLASS_C_DEC::
  63 notify_find_search_end()
  64 { _GLIBCXX_DEBUG_ONLY(assert_valid();) }
  65
  66 PB_DS_CLASS_T_DEC
  67 inline void
  68 PB_DS_CLASS_C_DEC::
  69 notify_insert_search_start()
  70 { _GLIBCXX_DEBUG_ONLY(assert_valid();) }
  71
  72 PB_DS_CLASS_T_DEC
  73 inline void
  74 PB_DS_CLASS_C_DEC::
  75 notify_insert_search_collision()
  76 { _GLIBCXX_DEBUG_ONLY(assert_valid();) }
  77
  78 PB_DS_CLASS_T_DEC
  79 inline void
  80 PB_DS_CLASS_C_DEC::
  81 notify_insert_search_end()
  82 { _GLIBCXX_DEBUG_ONLY(assert_valid();) }
  83
  84 PB_DS_CLASS_T_DEC
  85 inline void
  86 PB_DS_CLASS_C_DEC::
  87 notify_erase_search_start()
  88 { _GLIBCXX_DEBUG_ONLY(assert_valid();) }
  89
  90 PB_DS_CLASS_T_DEC
  91 inline void
  92 PB_DS_CLASS_C_DEC::
  93 notify_erase_search_collision()
  94 { _GLIBCXX_DEBUG_ONLY(assert_valid();) }
  95
  96 PB_DS_CLASS_T_DEC
  97 inline void
  98 PB_DS_CLASS_C_DEC::
  99 notify_erase_search_end()
 100 { _GLIBCXX_DEBUG_ONLY(assert_valid();) }
 101
 102 PB_DS_CLASS_T_DEC
 103 inline void
 104 PB_DS_CLASS_C_DEC::
 105 notify_inserted(size_type num_entries)
 106 {
 107   m_resize_needed = (num_entries >= m_next_grow_size);
 108   size_base::set_size(num_entries);
 109   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 110 }
 111
 112 PB_DS_CLASS_T_DEC
 113 inline void
 114 PB_DS_CLASS_C_DEC::
 115 notify_erased(size_type num_entries)
 116 {
 117   size_base::set_size(num_entries);
 118   m_resize_needed = num_entries <= m_next_shrink_size;
 119   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 120 }
 121
 122 PB_DS_CLASS_T_DEC
 123 inline bool
 124 PB_DS_CLASS_C_DEC::
 125 is_resize_needed() const
 126 {
 127   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 128   return m_resize_needed;
 129 }
 130
 131 PB_DS_CLASS_T_DEC
 132 inline bool
 133 PB_DS_CLASS_C_DEC::
 134 is_grow_needed(size_type /*size*/, size_type num_entries) const
 135 {
 136   _GLIBCXX_DEBUG_ASSERT(m_resize_needed);
 137   return num_entries >= m_next_grow_size;
 138 }
 139
 140 PB_DS_CLASS_T_DEC
 141 PB_DS_CLASS_C_DEC::
 142 ~hash_load_check_resize_trigger() { }
 143
 144 PB_DS_CLASS_T_DEC
 145 void
 146 PB_DS_CLASS_C_DEC::
 147 notify_resized(size_type new_size)
 148 {
 149   m_resize_needed = false;
 150   m_next_grow_size = size_type(m_load_max * new_size - 1);
 151   m_next_shrink_size = size_type(m_load_min * new_size);
 152
 153 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_
 154   std::cerr << "hlcrt::notify_resized " <<
 155     static_cast<unsigned long>(new_size) << "    " <<
 156     static_cast<unsigned long>(m_load_min) << "    " <<
 157     static_cast<unsigned long>(m_load_max) << "    " <<
 158     static_cast<unsigned long>(m_next_shrink_size) << " " <<
 159     static_cast<unsigned long>(m_next_grow_size) << "    " << std::endl;
 160 #endif
 161
 162   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 163 }
 164
 165 PB_DS_CLASS_T_DEC
 166 void
 167 PB_DS_CLASS_C_DEC::
 168 notify_externally_resized(size_type new_size)
 169 {
 170   m_resize_needed = false;
 171   size_type new_grow_size = size_type(m_load_max * new_size - 1);
 172   size_type new_shrink_size = size_type(m_load_min * new_size);
 173   if (new_grow_size >= m_next_grow_size)
 174     {
 175       _GLIBCXX_DEBUG_ASSERT(new_shrink_size > m_next_shrink_size);
 176       m_next_grow_size = new_grow_size;
 177       _GLIBCXX_DEBUG_ONLY(assert_valid();)
 178
 179 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_
 180         std::cerr << "hlcrt::notify_externally_resized1 " <<
 181         static_cast<unsigned long>(new_size) << "    " <<
 182         static_cast<unsigned long>(m_load_min) << "    " <<
 183         static_cast<unsigned long>(m_load_max) << "    " <<
 184         static_cast<unsigned long>(m_next_shrink_size) << " " <<
 185         static_cast<unsigned long>(m_next_grow_size) << "    " << std::endl;
 186 #endif
 187       return;
 188     }
 189
 190   _GLIBCXX_DEBUG_ASSERT(new_shrink_size <= m_next_shrink_size);
 191   m_next_shrink_size = new_shrink_size;
 192
 193 #ifdef PB_DS_HT_MAP_RESIZE_TRACE_
 194   std::cerr << "hlcrt::notify_externally_resized2 " <<
 195     static_cast<unsigned long>(new_size) << "    " <<
 196     static_cast<unsigned long>(m_load_min) << "    " <<
 197     static_cast<unsigned long>(m_load_max) << "    " <<
 198     static_cast<unsigned long>(m_next_shrink_size) << " " <<
 199     static_cast<unsigned long>(m_next_grow_size) << "    " << std::endl;
 200 #endif
 201
 202   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 203 }
 204
 205 PB_DS_CLASS_T_DEC
 206 void
 207 PB_DS_CLASS_C_DEC::
 208 notify_cleared()
 209 {
 210   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 211   size_base::set_size(0);
 212   m_resize_needed = (0 < m_next_shrink_size);
 213   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 214 }
 215
 216 PB_DS_CLASS_T_DEC
 217 void
 218 PB_DS_CLASS_C_DEC::
 219 swap(PB_DS_CLASS_C_DEC& other)
 220 {
 221   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 222   _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
 223
 224   size_base::swap(other);
 225   std::swap(m_load_min, other.m_load_min);
 226   std::swap(m_load_max, other.m_load_max);
 227   std::swap(m_resize_needed, other.m_resize_needed);
 228   std::swap(m_next_grow_size, other.m_next_grow_size);
 229   std::swap(m_next_shrink_size, other.m_next_shrink_size);
 230
 231   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 232   _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
 233 }
 234
 235 PB_DS_CLASS_T_DEC
 236 inline std::pair<float, float>
 237 PB_DS_CLASS_C_DEC::
 238 get_loads() const
 239 {
 240   PB_DS_STATIC_ASSERT(access, external_load_access);
 241   return std::make_pair(m_load_min, m_load_max);
 242 }
 243
 244 PB_DS_CLASS_T_DEC
 245 void
 246 PB_DS_CLASS_C_DEC::
 247 set_loads(std::pair<float, float> load_pair)
 248 {
 249   PB_DS_STATIC_ASSERT(access, external_load_access);
 250   const float old_load_min = m_load_min;
 251   const float old_load_max = m_load_max;
 252   const size_type old_next_shrink_size = m_next_shrink_size;
 253   const size_type old_next_grow_size = m_next_grow_size;
 254   const bool old_resize_needed = m_resize_needed;
 255
 256   __try
 257     {
 258       m_load_min = load_pair.first;
 259       m_load_max = load_pair.second;
 260       do_resize(static_cast<size_type>(size_base::get_size() / ((m_load_min + m_load_max) / 2)));
 261     }
 262   __catch(...)
 263     {
 264       m_load_min = old_load_min;
 265       m_load_max = old_load_max;
 266       m_next_shrink_size = old_next_shrink_size;
 267       m_next_grow_size = old_next_grow_size;
 268       m_resize_needed = old_resize_needed;
 269       __throw_exception_again;
 270     }
 271 }
 272
 273 PB_DS_CLASS_T_DEC
 274 void
 275 PB_DS_CLASS_C_DEC::
 276 do_resize(size_type)
 277 { std::abort(); }
 278
 279 #ifdef _GLIBCXX_DEBUG
 280 PB_DS_CLASS_T_DEC
 281 void
 282 PB_DS_CLASS_C_DEC::
 283 assert_valid() const
 284 {
 285   _GLIBCXX_DEBUG_ASSERT(m_load_max > m_load_min);
 286   _GLIBCXX_DEBUG_ASSERT(m_next_grow_size >= m_next_shrink_size);
 287 }
 288 #endif
 289