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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