Subversion Repositories scarts

// -*- C++ -*-

// Copyright (C) 2005 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 2, 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.

// You should have received a copy of the GNU General Public License along

// with this library; see the file COPYING.  If not, write to the Free

// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// USA.

// As a special exception, you may use this file as part of a free software

// library without restriction.  Specifically, if other files instantiate

// templates or use macros or inline functions from this file, or you compile

// this file and link it with other files to produce an executable, this

// file does not by itself cause the resulting executable to be covered by

// the GNU General Public License.  This exception does not however

// invalidate any other reasons why the executable file might be covered by

// the GNU General Public License.

// 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 an implementation of cc_hash_max_collision_check_resize_trigger.

 */

PB_ASSOC_CLASS_T_DEC

pb_assoc::detail::int_to_type<External_Load_Access>

PB_ASSOC_CLASS_C_DEC::s_external_load_access_ind;

PB_ASSOC_CLASS_T_DEC

PB_ASSOC_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_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_find_search_start()

{ }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_find_search_collision()

{ }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_find_search_end()

{ }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_insert_search_start()

{

  m_num_col = 0;

}

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_insert_search_collision()

{

  ++m_num_col;

}

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_insert_search_end()

{

  PB_ASSOC_DBG_ASSERT(NOTHING_HT_RESIZE_ACTION == 0);

  m_resize_needed =

    m_resize_needed || (m_num_col >= m_max_col);

}

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_erase_search_start()

{ }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_erase_search_collision()

{ }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_erase_search_end()

{ }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_inserted(size_type num_e)

{

  PB_ASSOC_DBG_ASSERT(num_e <= m_size);

  if (num_e == m_size)

    m_resize_needed = true;

}

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_erased(size_type num_e)

{

  PB_ASSOC_DBG_ASSERT(num_e <= m_size);

  m_resize_needed = false;

}

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

notify_cleared()

{

  m_resize_needed = false;

}

PB_ASSOC_CLASS_T_DEC

inline bool

PB_ASSOC_CLASS_C_DEC::

is_resize_needed() const

{

  return (m_resize_needed);

}

PB_ASSOC_CLASS_T_DEC

inline bool

PB_ASSOC_CLASS_C_DEC::

is_grow_needed(size_type /*size*/, size_type /*num_used_e*/) const

{

  PB_ASSOC_DBG_ASSERT(m_resize_needed);

  return (true);

}

PB_ASSOC_CLASS_T_DEC

inline bool

PB_ASSOC_CLASS_C_DEC::

is_shrink_needed(size_type size, size_type num_used_e) const

{

  PB_ASSOC_DBG_ASSERT(m_resize_needed);

  return (false);

}

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

notify_resized(size_type new_size)

{

  m_size = new_size;

  // max_col <-- \sqrt{2 load \ln( 2 m \ln( m ) ) }

  const double ln_arg = 2*  m_size*  ::log( (double)m_size);

  m_max_col = (size_type)::ceil(  ::sqrt(2*   m_load*  ::log(ln_arg) ) );

  m_num_col = 0;

  m_resize_needed = false;

}

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

notify_externally_resized(size_type new_size)

{

  notify_resized(new_size);

}

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

swap(PB_ASSOC_CLASS_C_DEC& r_other)

{

  std::swap(m_load, r_other.m_load);

  std::swap(m_size, r_other.m_size);

  std::swap(m_num_col, r_other.m_num_col);

  std::swap(m_max_col, r_other.m_max_col);

  std::swap(m_resize_needed, r_other.m_resize_needed);

}

PB_ASSOC_CLASS_T_DEC

inline float

PB_ASSOC_CLASS_C_DEC::

get_load_imp(pb_assoc::detail::int_to_type<true>) const

{

  return (m_load);

}