hash_load_check_resize_trigger_imp.hpp revision 169691
1169691Skan// -*- C++ -*- 2169691Skan 3169691Skan// Copyright (C) 2005, 2006 Free Software Foundation, Inc. 4169691Skan// 5169691Skan// This file is part of the GNU ISO C++ Library. This library is free 6169691Skan// software; you can redistribute it and/or modify it under the terms 7169691Skan// of the GNU General Public License as published by the Free Software 8169691Skan// Foundation; either version 2, or (at your option) any later 9169691Skan// version. 10169691Skan 11169691Skan// This library is distributed in the hope that it will be useful, but 12169691Skan// WITHOUT ANY WARRANTY; without even the implied warranty of 13169691Skan// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14169691Skan// General Public License for more details. 15169691Skan 16169691Skan// You should have received a copy of the GNU General Public License 17169691Skan// along with this library; see the file COPYING. If not, write to 18169691Skan// the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 19169691Skan// MA 02111-1307, USA. 20169691Skan 21169691Skan// As a special exception, you may use this file as part of a free 22169691Skan// software library without restriction. Specifically, if other files 23169691Skan// instantiate templates or use macros or inline functions from this 24169691Skan// file, or you compile this file and link it with other files to 25169691Skan// produce an executable, this file does not by itself cause the 26169691Skan// resulting executable to be covered by the GNU General Public 27169691Skan// License. This exception does not however invalidate any other 28169691Skan// reasons why the executable file might be covered by the GNU General 29169691Skan// Public License. 30169691Skan 31169691Skan// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 32169691Skan 33169691Skan// Permission to use, copy, modify, sell, and distribute this software 34169691Skan// is hereby granted without fee, provided that the above copyright 35169691Skan// notice appears in all copies, and that both that copyright notice 36169691Skan// and this permission notice appear in supporting documentation. None 37169691Skan// of the above authors, nor IBM Haifa Research Laboratories, make any 38169691Skan// representation about the suitability of this software for any 39169691Skan// purpose. It is provided "as is" without express or implied 40169691Skan// warranty. 41169691Skan 42169691Skan/** 43169691Skan * @file hash_load_check_resize_trigger_imp.hpp 44169691Skan * Contains a resize trigger implementation. 45169691Skan */ 46169691Skan 47169691Skan#define PB_DS_STATIC_ASSERT(UNIQUE, E) \ 48169691Skan typedef detail::static_assert_dumclass<sizeof(detail::static_assert<bool(E)>)> UNIQUE##static_assert_type 49169691Skan 50169691SkanPB_DS_CLASS_T_DEC 51169691SkanPB_DS_CLASS_C_DEC:: 52169691Skanhash_load_check_resize_trigger(float load_min, float load_max) 53169691Skan: m_load_min(load_min), m_load_max(load_max), m_next_shrink_size(0), 54169691Skan m_next_grow_size(0), m_resize_needed(false) 55169691Skan{ _GLIBCXX_DEBUG_ONLY(assert_valid();) } 56169691Skan 57169691SkanPB_DS_CLASS_T_DEC 58169691Skaninline void 59169691SkanPB_DS_CLASS_C_DEC:: 60169691Skannotify_find_search_start() 61169691Skan{ _GLIBCXX_DEBUG_ONLY(assert_valid();) } 62169691Skan 63169691SkanPB_DS_CLASS_T_DEC 64169691Skaninline void 65169691SkanPB_DS_CLASS_C_DEC:: 66169691Skannotify_find_search_collision() 67169691Skan{ _GLIBCXX_DEBUG_ONLY(assert_valid();) } 68169691Skan 69169691SkanPB_DS_CLASS_T_DEC 70169691Skaninline void 71169691SkanPB_DS_CLASS_C_DEC:: 72169691Skannotify_find_search_end() 73169691Skan{ _GLIBCXX_DEBUG_ONLY(assert_valid();) } 74169691Skan 75169691SkanPB_DS_CLASS_T_DEC 76169691Skaninline void 77169691SkanPB_DS_CLASS_C_DEC:: 78169691Skannotify_insert_search_start() 79169691Skan{ _GLIBCXX_DEBUG_ONLY(assert_valid();) } 80169691Skan 81169691SkanPB_DS_CLASS_T_DEC 82169691Skaninline void 83169691SkanPB_DS_CLASS_C_DEC:: 84169691Skannotify_insert_search_collision() 85169691Skan{ _GLIBCXX_DEBUG_ONLY(assert_valid();) } 86169691Skan 87169691SkanPB_DS_CLASS_T_DEC 88169691Skaninline void 89169691SkanPB_DS_CLASS_C_DEC:: 90169691Skannotify_insert_search_end() 91169691Skan{ _GLIBCXX_DEBUG_ONLY(assert_valid();) } 92169691Skan 93169691SkanPB_DS_CLASS_T_DEC 94169691Skaninline void 95169691SkanPB_DS_CLASS_C_DEC:: 96169691Skannotify_erase_search_start() 97169691Skan{ _GLIBCXX_DEBUG_ONLY(assert_valid();) } 98169691Skan 99169691SkanPB_DS_CLASS_T_DEC 100169691Skaninline void 101169691SkanPB_DS_CLASS_C_DEC:: 102169691Skannotify_erase_search_collision() 103169691Skan{ _GLIBCXX_DEBUG_ONLY(assert_valid();) } 104169691Skan 105169691SkanPB_DS_CLASS_T_DEC 106169691Skaninline void 107169691SkanPB_DS_CLASS_C_DEC:: 108169691Skannotify_erase_search_end() 109169691Skan{ _GLIBCXX_DEBUG_ONLY(assert_valid();) } 110169691Skan 111169691SkanPB_DS_CLASS_T_DEC 112169691Skaninline void 113169691SkanPB_DS_CLASS_C_DEC:: 114169691Skannotify_inserted(size_type num_entries) 115169691Skan{ 116169691Skan m_resize_needed = (num_entries >= m_next_grow_size); 117169691Skan size_base::set_size(num_entries); 118169691Skan _GLIBCXX_DEBUG_ONLY(assert_valid();) 119169691Skan} 120169691Skan 121169691SkanPB_DS_CLASS_T_DEC 122169691Skaninline void 123169691SkanPB_DS_CLASS_C_DEC:: 124169691Skannotify_erased(size_type num_entries) 125169691Skan{ 126169691Skan size_base::set_size(num_entries); 127169691Skan m_resize_needed = num_entries <= m_next_shrink_size; 128169691Skan _GLIBCXX_DEBUG_ONLY(assert_valid();) 129169691Skan} 130169691Skan 131169691SkanPB_DS_CLASS_T_DEC 132169691Skaninline bool 133169691SkanPB_DS_CLASS_C_DEC:: 134169691Skanis_resize_needed() const 135169691Skan{ 136169691Skan _GLIBCXX_DEBUG_ONLY(assert_valid();) 137169691Skan return m_resize_needed; 138169691Skan} 139169691Skan 140169691SkanPB_DS_CLASS_T_DEC 141169691Skaninline bool 142169691SkanPB_DS_CLASS_C_DEC:: 143169691Skanis_grow_needed(size_type /*size*/, size_type num_entries) const 144169691Skan{ 145169691Skan _GLIBCXX_DEBUG_ASSERT(m_resize_needed); 146169691Skan return num_entries >= m_next_grow_size; 147169691Skan} 148169691Skan 149169691SkanPB_DS_CLASS_T_DEC 150169691SkanPB_DS_CLASS_C_DEC:: 151169691Skan~hash_load_check_resize_trigger() { } 152169691Skan 153169691SkanPB_DS_CLASS_T_DEC 154169691Skanvoid 155169691SkanPB_DS_CLASS_C_DEC:: 156169691Skannotify_resized(size_type new_size) 157169691Skan{ 158169691Skan m_resize_needed = false; 159169691Skan m_next_grow_size = size_type(m_load_max * new_size - 1); 160169691Skan m_next_shrink_size = size_type(m_load_min * new_size); 161169691Skan 162169691Skan#ifdef PB_DS_HT_MAP_RESIZE_TRACE_ 163169691Skan std::cerr << "hlcrt::notify_resized " << 164169691Skan static_cast<unsigned long>(new_size) << " " << 165169691Skan static_cast<unsigned long>(m_load_min) << " " << 166169691Skan static_cast<unsigned long>(m_load_max) << " " << 167169691Skan static_cast<unsigned long>(m_next_shrink_size) << " " << 168169691Skan static_cast<unsigned long>(m_next_grow_size) << " " << std::endl; 169169691Skan#endif 170169691Skan 171169691Skan _GLIBCXX_DEBUG_ONLY(assert_valid();) 172169691Skan} 173169691Skan 174169691SkanPB_DS_CLASS_T_DEC 175169691Skanvoid 176169691SkanPB_DS_CLASS_C_DEC:: 177169691Skannotify_externally_resized(size_type new_size) 178169691Skan{ 179169691Skan m_resize_needed = false; 180169691Skan size_type new_grow_size = size_type(m_load_max * new_size - 1); 181169691Skan size_type new_shrink_size = size_type(m_load_min * new_size ); 182169691Skan if (new_grow_size >= m_next_grow_size) 183169691Skan { 184169691Skan _GLIBCXX_DEBUG_ASSERT(new_shrink_size > m_next_shrink_size); 185169691Skan m_next_grow_size = new_grow_size; 186169691Skan _GLIBCXX_DEBUG_ONLY(assert_valid();) 187169691Skan 188169691Skan#ifdef PB_DS_HT_MAP_RESIZE_TRACE_ 189169691Skan std::cerr << "hlcrt::notify_externally_resized1 " << 190169691Skan static_cast<unsigned long>(new_size) << " " << 191169691Skan static_cast<unsigned long>(m_load_min) << " " << 192169691Skan static_cast<unsigned long>(m_load_max) << " " << 193169691Skan static_cast<unsigned long>(m_next_shrink_size) << " " << 194169691Skan static_cast<unsigned long>(m_next_grow_size) << " " << std::endl; 195169691Skan#endif 196169691Skan return; 197169691Skan } 198169691Skan 199169691Skan _GLIBCXX_DEBUG_ASSERT(new_shrink_size <= m_next_shrink_size); 200169691Skan m_next_shrink_size = new_shrink_size; 201169691Skan 202169691Skan#ifdef PB_DS_HT_MAP_RESIZE_TRACE_ 203169691Skan std::cerr << "hlcrt::notify_externally_resized2 " << 204169691Skan static_cast<unsigned long>(new_size) << " " << 205169691Skan static_cast<unsigned long>(m_load_min) << " " << 206169691Skan static_cast<unsigned long>(m_load_max) << " " << 207169691Skan static_cast<unsigned long>(m_next_shrink_size) << " " << 208169691Skan static_cast<unsigned long>(m_next_grow_size) << " " << std::endl; 209169691Skan#endif 210169691Skan 211169691Skan _GLIBCXX_DEBUG_ONLY(assert_valid();) 212169691Skan} 213169691Skan 214169691SkanPB_DS_CLASS_T_DEC 215169691Skanvoid 216169691SkanPB_DS_CLASS_C_DEC:: 217169691Skannotify_cleared() 218169691Skan{ 219169691Skan _GLIBCXX_DEBUG_ONLY(assert_valid();) 220169691Skan size_base::set_size(0); 221169691Skan m_resize_needed = (0 < m_next_shrink_size); 222169691Skan _GLIBCXX_DEBUG_ONLY(assert_valid();) 223169691Skan} 224169691Skan 225169691SkanPB_DS_CLASS_T_DEC 226169691Skanvoid 227169691SkanPB_DS_CLASS_C_DEC:: 228169691Skanswap(PB_DS_CLASS_C_DEC& other) 229169691Skan{ 230169691Skan _GLIBCXX_DEBUG_ONLY(assert_valid();) 231169691Skan _GLIBCXX_DEBUG_ONLY(other.assert_valid();) 232169691Skan 233169691Skan size_base::swap(other); 234169691Skan std::swap(m_load_min, other.m_load_min); 235169691Skan std::swap(m_load_max, other.m_load_max); 236169691Skan std::swap(m_resize_needed, other.m_resize_needed); 237169691Skan std::swap(m_next_grow_size, other.m_next_grow_size); 238169691Skan std::swap(m_next_shrink_size, other.m_next_shrink_size); 239169691Skan 240169691Skan _GLIBCXX_DEBUG_ONLY(assert_valid();) 241169691Skan _GLIBCXX_DEBUG_ONLY(other.assert_valid();) 242169691Skan} 243169691Skan 244169691SkanPB_DS_CLASS_T_DEC 245169691Skaninline std::pair<float, float> 246169691SkanPB_DS_CLASS_C_DEC:: 247169691Skanget_loads() const 248169691Skan{ 249169691Skan PB_DS_STATIC_ASSERT(access, external_load_access); 250169691Skan return std::make_pair(m_load_min, m_load_max); 251169691Skan} 252169691Skan 253169691SkanPB_DS_CLASS_T_DEC 254169691Skanvoid 255169691SkanPB_DS_CLASS_C_DEC:: 256169691Skanset_loads(std::pair<float, float> load_pair) 257169691Skan{ 258169691Skan PB_DS_STATIC_ASSERT(access, external_load_access); 259169691Skan const float old_load_min = m_load_min; 260169691Skan const float old_load_max = m_load_max; 261169691Skan const size_type old_next_shrink_size = m_next_shrink_size; 262169691Skan const size_type old_next_grow_size = m_next_grow_size; 263169691Skan const bool old_resize_needed = m_resize_needed; 264169691Skan 265169691Skan try 266169691Skan { 267169691Skan m_load_min = load_pair.first; 268169691Skan m_load_max = load_pair.second; 269169691Skan do_resize(static_cast<size_type>(size_base::get_size() / ((m_load_min + m_load_max) / 2))); 270169691Skan } 271169691Skan catch (...) 272169691Skan { 273169691Skan m_load_min = old_load_min; 274169691Skan m_load_max = old_load_max; 275169691Skan m_next_shrink_size = old_next_shrink_size; 276169691Skan m_next_grow_size = old_next_grow_size; 277169691Skan m_resize_needed = old_resize_needed; 278169691Skan __throw_exception_again; 279169691Skan } 280169691Skan} 281169691Skan 282169691SkanPB_DS_CLASS_T_DEC 283169691Skanvoid 284169691SkanPB_DS_CLASS_C_DEC:: 285169691Skando_resize(size_type) 286169691Skan{ abort(); } 287169691Skan 288169691Skan#ifdef _GLIBCXX_DEBUG 289169691SkanPB_DS_CLASS_T_DEC 290169691Skanvoid 291169691SkanPB_DS_CLASS_C_DEC:: 292169691Skanassert_valid() const 293169691Skan{ 294169691Skan _GLIBCXX_DEBUG_ASSERT(m_load_max > m_load_min); 295169691Skan _GLIBCXX_DEBUG_ASSERT(m_next_grow_size >= m_next_shrink_size); 296169691Skan} 297169691Skan#endif 298169691Skan 299169691Skan#undef PB_DS_STATIC_ASSERT 300169691Skan 301