| // -*- C++ -*- |
| |
| // Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the terms |
| // of the GNU General Public License as published by the Free Software |
| // Foundation; either version 3, or (at your option) any later |
| // version. |
| |
| // This library is distributed in the hope that it will be useful, but |
| // WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| // General Public License for more details. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. |
| |
| // Permission to use, copy, modify, sell, and distribute this software |
| // is hereby granted without fee, provided that the above copyright |
| // notice appears in all copies, and that both that copyright notice |
| // and this permission notice appear in supporting documentation. None |
| // of the above authors, nor IBM Haifa Research Laboratories, make any |
| // representation about the suitability of this software for any |
| // purpose. It is provided "as is" without express or implied |
| // warranty. |
| |
| /** |
| * @file cc_hash_max_collision_check_resize_trigger_imp.hpp |
| * Contains a resize trigger implementation. |
| */ |
| |
| PB_DS_CLASS_T_DEC |
| PB_DS_CLASS_C_DEC:: |
| cc_hash_max_collision_check_resize_trigger(float load) : |
| m_load(load), |
| m_size(0), |
| m_num_col(0), |
| m_max_col(0), |
| m_resize_needed(false) |
| { } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_find_search_start() |
| { } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_find_search_collision() |
| { } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_find_search_end() |
| { } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_insert_search_start() |
| { m_num_col = 0; } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_insert_search_collision() |
| { ++m_num_col; } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_insert_search_end() |
| { calc_resize_needed(); } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_erase_search_start() |
| { } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_erase_search_collision() |
| { } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_erase_search_end() |
| { } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_inserted(size_type) |
| { } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| notify_erased(size_type) |
| { m_resize_needed = true; } |
| |
| PB_DS_CLASS_T_DEC |
| void |
| PB_DS_CLASS_C_DEC:: |
| notify_cleared() |
| { m_resize_needed = false; } |
| |
| PB_DS_CLASS_T_DEC |
| inline bool |
| PB_DS_CLASS_C_DEC:: |
| is_resize_needed() const |
| { return m_resize_needed; } |
| |
| PB_DS_CLASS_T_DEC |
| inline bool |
| PB_DS_CLASS_C_DEC:: |
| is_grow_needed(size_type /*size*/, size_type /*num_used_e*/) const |
| { return m_num_col >= m_max_col; } |
| |
| PB_DS_CLASS_T_DEC |
| void |
| PB_DS_CLASS_C_DEC:: |
| notify_resized(size_type new_size) |
| { |
| m_size = new_size; |
| |
| #ifdef PB_DS_HT_MAP_RESIZE_TRACE_ |
| std::cerr << "chmccrt::notify_resized " |
| << static_cast<unsigned long>(new_size) << std::endl; |
| #endif |
| |
| calc_max_num_coll(); |
| calc_resize_needed(); |
| m_num_col = 0; |
| } |
| |
| PB_DS_CLASS_T_DEC |
| void |
| PB_DS_CLASS_C_DEC:: |
| calc_max_num_coll() |
| { |
| // max_col <-- \sqrt{2 load \ln( 2 m \ln( m ) ) } |
| const double ln_arg = 2 * m_size * std::log(double(m_size)); |
| m_max_col = size_type(std::ceil(std::sqrt(2 * m_load * std::log(ln_arg)))); |
| |
| #ifdef PB_DS_HT_MAP_RESIZE_TRACE_ |
| std::cerr << "chmccrt::calc_max_num_coll " |
| << static_cast<unsigned long>(m_size) << " " |
| << static_cast<unsigned long>(m_max_col) << std::endl; |
| #endif |
| } |
| |
| PB_DS_CLASS_T_DEC |
| void |
| PB_DS_CLASS_C_DEC:: |
| notify_externally_resized(size_type new_size) |
| { notify_resized(new_size); } |
| |
| PB_DS_CLASS_T_DEC |
| void |
| PB_DS_CLASS_C_DEC:: |
| swap(PB_DS_CLASS_C_DEC& other) |
| { |
| std::swap(m_load, other.m_load); |
| std::swap(m_size, other.m_size); |
| std::swap(m_num_col, other.m_num_col); |
| std::swap(m_max_col, other.m_max_col); |
| std::swap(m_resize_needed, other.m_resize_needed); |
| } |
| |
| PB_DS_CLASS_T_DEC |
| inline float |
| PB_DS_CLASS_C_DEC:: |
| get_load() const |
| { |
| PB_DS_STATIC_ASSERT(access, external_load_access); |
| return m_load; |
| } |
| |
| PB_DS_CLASS_T_DEC |
| inline void |
| PB_DS_CLASS_C_DEC:: |
| calc_resize_needed() |
| { m_resize_needed = m_resize_needed || m_num_col >= m_max_col; } |
| |
| PB_DS_CLASS_T_DEC |
| void |
| PB_DS_CLASS_C_DEC:: |
| set_load(float load) |
| { |
| PB_DS_STATIC_ASSERT(access, external_load_access); |
| m_load = load; |
| calc_max_num_coll(); |
| calc_resize_needed(); |
| } |
| |