forked from KolibriOS/kolibrios
432e5f16f8
git-svn-id: svn://kolibrios.org@6554 a494cfbc-eb01-0410-851d-a64ba20cac60
294 lines
7.6 KiB
C++
294 lines
7.6 KiB
C++
// -*- 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 hash_load_check_resize_trigger_imp.hpp
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* Contains a resize trigger implementation.
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*/
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#define PB_DS_ASSERT_VALID(X) \
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_GLIBCXX_DEBUG_ONLY(X.assert_valid(__FILE__, __LINE__);)
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_C_DEC::
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hash_load_check_resize_trigger(float load_min, float load_max)
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: m_load_min(load_min), m_load_max(load_max), m_next_shrink_size(0),
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m_next_grow_size(0), m_resize_needed(false)
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{ PB_DS_ASSERT_VALID((*this)) }
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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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{ PB_DS_ASSERT_VALID((*this)) }
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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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{ PB_DS_ASSERT_VALID((*this)) }
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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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{ PB_DS_ASSERT_VALID((*this)) }
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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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{ PB_DS_ASSERT_VALID((*this)) }
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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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{ PB_DS_ASSERT_VALID((*this)) }
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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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{ PB_DS_ASSERT_VALID((*this)) }
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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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{ PB_DS_ASSERT_VALID((*this)) }
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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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{ PB_DS_ASSERT_VALID((*this)) }
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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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{ PB_DS_ASSERT_VALID((*this)) }
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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 num_entries)
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{
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m_resize_needed = (num_entries >= m_next_grow_size);
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size_base::set_size(num_entries);
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PB_DS_ASSERT_VALID((*this))
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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 num_entries)
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{
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size_base::set_size(num_entries);
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m_resize_needed = num_entries <= m_next_shrink_size;
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PB_DS_ASSERT_VALID((*this))
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}
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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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{
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PB_DS_ASSERT_VALID((*this))
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return m_resize_needed;
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}
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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_entries) const
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{
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_GLIBCXX_DEBUG_ASSERT(m_resize_needed);
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return num_entries >= m_next_grow_size;
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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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~hash_load_check_resize_trigger() { }
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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_resize_needed = false;
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m_next_grow_size = size_type(m_load_max * new_size - 1);
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m_next_shrink_size = size_type(m_load_min * new_size);
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#ifdef PB_DS_HT_MAP_RESIZE_TRACE_
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std::cerr << "hlcrt::notify_resized " << std::endl
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<< "1 " << new_size << std::endl
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<< "2 " << m_load_min << std::endl
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<< "3 " << m_load_max << std::endl
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<< "4 " << m_next_shrink_size << std::endl
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<< "5 " << m_next_grow_size << std::endl;
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#endif
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PB_DS_ASSERT_VALID((*this))
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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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{
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m_resize_needed = false;
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size_type new_grow_size = size_type(m_load_max * new_size - 1);
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size_type new_shrink_size = size_type(m_load_min * new_size);
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#ifdef PB_DS_HT_MAP_RESIZE_TRACE_
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std::cerr << "hlcrt::notify_externally_resized " << std::endl
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<< "1 " << new_size << std::endl
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<< "2 " << m_load_min << std::endl
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<< "3 " << m_load_max << std::endl
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<< "4 " << m_next_shrink_size << std::endl
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<< "5 " << m_next_grow_size << std::endl
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<< "6 " << new_shrink_size << std::endl
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<< "7 " << new_grow_size << std::endl;
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#endif
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if (new_grow_size >= m_next_grow_size)
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{
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_GLIBCXX_DEBUG_ASSERT(new_shrink_size >= m_next_shrink_size);
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m_next_grow_size = new_grow_size;
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}
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else
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{
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_GLIBCXX_DEBUG_ASSERT(new_shrink_size <= m_next_shrink_size);
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m_next_shrink_size = new_shrink_size;
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}
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PB_DS_ASSERT_VALID((*this))
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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_cleared()
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{
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PB_DS_ASSERT_VALID((*this))
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size_base::set_size(0);
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m_resize_needed = (0 < m_next_shrink_size);
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PB_DS_ASSERT_VALID((*this))
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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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swap(PB_DS_CLASS_C_DEC& other)
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{
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PB_DS_ASSERT_VALID((*this))
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PB_DS_ASSERT_VALID(other)
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size_base::swap(other);
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std::swap(m_load_min, other.m_load_min);
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std::swap(m_load_max, other.m_load_max);
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std::swap(m_resize_needed, other.m_resize_needed);
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std::swap(m_next_grow_size, other.m_next_grow_size);
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std::swap(m_next_shrink_size, other.m_next_shrink_size);
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PB_DS_ASSERT_VALID((*this))
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PB_DS_ASSERT_VALID(other)
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}
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PB_DS_CLASS_T_DEC
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inline std::pair<float, float>
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PB_DS_CLASS_C_DEC::
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get_loads() const
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{
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PB_DS_STATIC_ASSERT(access, external_load_access);
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return std::make_pair(m_load_min, m_load_max);
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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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set_loads(std::pair<float, float> load_pair)
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{
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PB_DS_STATIC_ASSERT(access, external_load_access);
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const float old_load_min = m_load_min;
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const float old_load_max = m_load_max;
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const size_type old_next_shrink_size = m_next_shrink_size;
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const size_type old_next_grow_size = m_next_grow_size;
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const bool old_resize_needed = m_resize_needed;
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__try
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{
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m_load_min = load_pair.first;
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m_load_max = load_pair.second;
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do_resize(static_cast<size_type>(size_base::get_size() / ((m_load_min + m_load_max) / 2)));
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}
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__catch(...)
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{
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m_load_min = old_load_min;
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m_load_max = old_load_max;
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m_next_shrink_size = old_next_shrink_size;
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m_next_grow_size = old_next_grow_size;
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m_resize_needed = old_resize_needed;
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__throw_exception_again;
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}
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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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do_resize(size_type)
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{ std::abort(); }
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#ifdef _GLIBCXX_DEBUG
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# define PB_DS_DEBUG_VERIFY(_Cond) \
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_GLIBCXX_DEBUG_VERIFY_AT(_Cond, \
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_M_message(#_Cond" assertion from %1;:%2;") \
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._M_string(__FILE__)._M_integer(__LINE__) \
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,__file,__line)
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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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assert_valid(const char* __file, int __line) const
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{
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PB_DS_DEBUG_VERIFY(m_load_max > m_load_min);
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PB_DS_DEBUG_VERIFY(m_next_grow_size >= m_next_shrink_size);
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}
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# undef PB_DS_DEBUG_VERIFY
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#endif
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#undef PB_DS_ASSERT_VALID
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