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// -*- C++ -*-
// Copyright (C) 2005, 2006, 2007, 2008, 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 hash_load_check_resize_trigger_imp.hpp
* Contains a resize trigger implementation.
*/
PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
hash_load_check_resize_trigger(float load_min, float load_max)
: m_load_min(load_min), m_load_max(load_max), m_next_shrink_size(0),
m_next_grow_size(0), m_resize_needed(false)
{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_find_search_start()
{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_find_search_collision()
{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_find_search_end()
{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_insert_search_start()
{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_insert_search_collision()
{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_insert_search_end()
{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_erase_search_start()
{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_erase_search_collision()
{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_erase_search_end()
{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_inserted(size_type num_entries)
{
m_resize_needed = (num_entries >= m_next_grow_size);
size_base::set_size(num_entries);
_GLIBCXX_DEBUG_ONLY(assert_valid();)
}
PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
notify_erased(size_type num_entries)
{
size_base::set_size(num_entries);
m_resize_needed = num_entries <= m_next_shrink_size;
_GLIBCXX_DEBUG_ONLY(assert_valid();)
}
PB_DS_CLASS_T_DEC
inline bool
PB_DS_CLASS_C_DEC::
is_resize_needed() const
{
_GLIBCXX_DEBUG_ONLY(assert_valid();)
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_entries) const
{
_GLIBCXX_DEBUG_ASSERT(m_resize_needed);
return num_entries >= m_next_grow_size;
}
PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
~hash_load_check_resize_trigger() { }
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
notify_resized(size_type new_size)
{
m_resize_needed = false;
m_next_grow_size = size_type(m_load_max * new_size - 1);
m_next_shrink_size = size_type(m_load_min * new_size);
#ifdef PB_DS_HT_MAP_RESIZE_TRACE_
std::cerr << "hlcrt::notify_resized " <<
static_cast<unsigned long>(new_size) << " " <<
static_cast<unsigned long>(m_load_min) << " " <<
static_cast<unsigned long>(m_load_max) << " " <<
static_cast<unsigned long>(m_next_shrink_size) << " " <<
static_cast<unsigned long>(m_next_grow_size) << " " << std::endl;
#endif
_GLIBCXX_DEBUG_ONLY(assert_valid();)
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
notify_externally_resized(size_type new_size)
{
m_resize_needed = false;
size_type new_grow_size = size_type(m_load_max * new_size - 1);
size_type new_shrink_size = size_type(m_load_min * new_size);
if (new_grow_size >= m_next_grow_size)
{
_GLIBCXX_DEBUG_ASSERT(new_shrink_size > m_next_shrink_size);
m_next_grow_size = new_grow_size;
_GLIBCXX_DEBUG_ONLY(assert_valid();)
#ifdef PB_DS_HT_MAP_RESIZE_TRACE_
std::cerr << "hlcrt::notify_externally_resized1 " <<
static_cast<unsigned long>(new_size) << " " <<
static_cast<unsigned long>(m_load_min) << " " <<
static_cast<unsigned long>(m_load_max) << " " <<
static_cast<unsigned long>(m_next_shrink_size) << " " <<
static_cast<unsigned long>(m_next_grow_size) << " " << std::endl;
#endif
return;
}
_GLIBCXX_DEBUG_ASSERT(new_shrink_size <= m_next_shrink_size);
m_next_shrink_size = new_shrink_size;
#ifdef PB_DS_HT_MAP_RESIZE_TRACE_
std::cerr << "hlcrt::notify_externally_resized2 " <<
static_cast<unsigned long>(new_size) << " " <<
static_cast<unsigned long>(m_load_min) << " " <<
static_cast<unsigned long>(m_load_max) << " " <<
static_cast<unsigned long>(m_next_shrink_size) << " " <<
static_cast<unsigned long>(m_next_grow_size) << " " << std::endl;
#endif
_GLIBCXX_DEBUG_ONLY(assert_valid();)
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
notify_cleared()
{
_GLIBCXX_DEBUG_ONLY(assert_valid();)
size_base::set_size(0);
m_resize_needed = (0 < m_next_shrink_size);
_GLIBCXX_DEBUG_ONLY(assert_valid();)
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
swap(PB_DS_CLASS_C_DEC& other)
{
_GLIBCXX_DEBUG_ONLY(assert_valid();)
_GLIBCXX_DEBUG_ONLY(other.assert_valid();)
size_base::swap(other);
std::swap(m_load_min, other.m_load_min);
std::swap(m_load_max, other.m_load_max);
std::swap(m_resize_needed, other.m_resize_needed);
std::swap(m_next_grow_size, other.m_next_grow_size);
std::swap(m_next_shrink_size, other.m_next_shrink_size);
_GLIBCXX_DEBUG_ONLY(assert_valid();)
_GLIBCXX_DEBUG_ONLY(other.assert_valid();)
}
PB_DS_CLASS_T_DEC
inline std::pair<float, float>
PB_DS_CLASS_C_DEC::
get_loads() const
{
PB_DS_STATIC_ASSERT(access, external_load_access);
return std::make_pair(m_load_min, m_load_max);
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
set_loads(std::pair<float, float> load_pair)
{
PB_DS_STATIC_ASSERT(access, external_load_access);
const float old_load_min = m_load_min;
const float old_load_max = m_load_max;
const size_type old_next_shrink_size = m_next_shrink_size;
const size_type old_next_grow_size = m_next_grow_size;
const bool old_resize_needed = m_resize_needed;
__try
{
m_load_min = load_pair.first;
m_load_max = load_pair.second;
do_resize(static_cast<size_type>(size_base::get_size() / ((m_load_min + m_load_max) / 2)));
}
__catch(...)
{
m_load_min = old_load_min;
m_load_max = old_load_max;
m_next_shrink_size = old_next_shrink_size;
m_next_grow_size = old_next_grow_size;
m_resize_needed = old_resize_needed;
__throw_exception_again;
}
}
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
do_resize(size_type)
{ std::abort(); }
#ifdef _GLIBCXX_DEBUG
PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
assert_valid() const
{
_GLIBCXX_DEBUG_ASSERT(m_load_max > m_load_min);
_GLIBCXX_DEBUG_ASSERT(m_next_grow_size >= m_next_shrink_size);
}
#endif
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