forked from KolibriOS/kolibrios
212 lines
4.8 KiB
C++
212 lines
4.8 KiB
C++
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// -*- C++ -*-
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// Copyright (C) 2005-2015 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file cc_hash_max_collision_check_resize_trigger_imp.hpp
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* Contains a resize trigger implementation.
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*/
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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cc_hash_max_collision_check_resize_trigger(float load) :
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m_load(load),
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m_size(0),
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m_num_col(0),
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m_max_col(0),
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m_resize_needed(false)
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{ }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_find_search_start()
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{ }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_find_search_collision()
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{ }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_find_search_end()
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{ }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_insert_search_start()
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{ m_num_col = 0; }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_insert_search_collision()
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{ ++m_num_col; }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_insert_search_end()
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{ calc_resize_needed(); }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_erase_search_start()
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{ }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_erase_search_collision()
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{ }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_erase_search_end()
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{ }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_inserted(size_type)
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{ }
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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notify_erased(size_type)
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{ m_resize_needed = true; }
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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notify_cleared()
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{ m_resize_needed = false; }
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PB_DS_CLASS_T_DEC
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inline bool
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PB_DS_CLASS_C_DEC::
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is_resize_needed() const
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{ return m_resize_needed; }
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PB_DS_CLASS_T_DEC
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inline bool
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PB_DS_CLASS_C_DEC::
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is_grow_needed(size_type /*size*/, size_type /*num_used_e*/) const
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{ return m_num_col >= m_max_col; }
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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notify_resized(size_type new_size)
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{
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m_size = new_size;
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#ifdef PB_DS_HT_MAP_RESIZE_TRACE_
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std::cerr << "chmccrt::notify_resized "
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<< static_cast<unsigned long>(new_size) << std::endl;
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#endif
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calc_max_num_coll();
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calc_resize_needed();
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m_num_col = 0;
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}
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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calc_max_num_coll()
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{
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// max_col <-- \sqrt{2 load \ln( 2 m \ln( m ) ) }
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const double ln_arg = 2 * m_size * std::log(double(m_size));
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m_max_col = size_type(std::ceil(std::sqrt(2 * m_load * std::log(ln_arg))));
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#ifdef PB_DS_HT_MAP_RESIZE_TRACE_
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std::cerr << "chmccrt::calc_max_num_coll "
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<< static_cast<unsigned long>(m_size) << " "
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<< static_cast<unsigned long>(m_max_col) << std::endl;
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#endif
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}
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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notify_externally_resized(size_type new_size)
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{ notify_resized(new_size); }
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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swap(PB_DS_CLASS_C_DEC& other)
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{
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std::swap(m_load, other.m_load);
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std::swap(m_size, other.m_size);
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std::swap(m_num_col, other.m_num_col);
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std::swap(m_max_col, other.m_max_col);
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std::swap(m_resize_needed, other.m_resize_needed);
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}
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PB_DS_CLASS_T_DEC
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inline float
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PB_DS_CLASS_C_DEC::
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get_load() const
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{
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PB_DS_STATIC_ASSERT(access, external_load_access);
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return m_load;
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}
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PB_DS_CLASS_T_DEC
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inline void
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PB_DS_CLASS_C_DEC::
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calc_resize_needed()
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{ m_resize_needed = m_resize_needed || m_num_col >= m_max_col; }
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PB_DS_CLASS_T_DEC
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void
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PB_DS_CLASS_C_DEC::
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set_load(float load)
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{
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PB_DS_STATIC_ASSERT(access, external_load_access);
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m_load = load;
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calc_max_num_coll();
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calc_resize_needed();
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}
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