resize_fn_imps.hpp   [plain text]

// -*- C++ -*-

// Copyright (C) 2005, 2006 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, 59 Temple Place - Suite 330, Boston,
// MA 02111-1307, 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
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// warranty.

/**
 * @file resize_fn_imps.hpp
 * Contains implementations of cc_ht_map_'s resize related functions.
 */

PB_DS_CLASS_T_DEC
inline bool
PB_DS_CLASS_C_DEC::
do_resize_if_needed()
{
  if (!resize_base::is_resize_needed())
    return false;
  resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
  return true;
}

PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
do_resize(size_type len)
{ resize_imp(resize_base::get_nearest_larger_size(len)); }

PB_DS_CLASS_T_DEC
inline void
PB_DS_CLASS_C_DEC::
do_resize_if_needed_no_throw()
{
  if (!resize_base::is_resize_needed())
    return;

  try
    {
      resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
    }
  catch(...)
    { }

  _GLIBCXX_DEBUG_ONLY(assert_valid();)
}

PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
resize_imp(size_type new_size)
{
  _GLIBCXX_DEBUG_ONLY(assert_valid();)
  if (new_size == m_num_e)
    return;

  const size_type old_size = m_num_e;
  entry_pointer_array a_p_entries_resized;

  // Following line might throw an exception.
  ranged_hash_fn_base::notify_resized(new_size);

  try
    {
      // Following line might throw an exception.
      a_p_entries_resized = s_entry_pointer_allocator.allocate(new_size);
      m_num_e = new_size;
    }
  catch(...)
    {
      ranged_hash_fn_base::notify_resized(old_size);
      __throw_exception_again;
    }

  // At this point no exceptions can be thrown.
  resize_imp_no_exceptions(new_size, a_p_entries_resized, old_size);
  Resize_Policy::notify_resized(new_size);
  _GLIBCXX_DEBUG_ONLY(assert_valid();)
}

PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
resize_imp_no_exceptions(size_type new_size, entry_pointer_array a_p_entries_resized, size_type old_size)
{
  std::fill(a_p_entries_resized, a_p_entries_resized + m_num_e,
	    entry_pointer(NULL));

  for (size_type pos = 0; pos < old_size; ++pos)
    {
      entry_pointer p_e = m_entries[pos];
      while (p_e != NULL)
	p_e = resize_imp_no_exceptions_reassign_pointer(p_e, a_p_entries_resized,  traits_base::m_store_extra_indicator);
    }

  m_num_e = new_size;
  _GLIBCXX_DEBUG_ONLY(assert_entry_pointer_array_valid(a_p_entries_resized);)
  s_entry_pointer_allocator.deallocate(m_entries, old_size);
  m_entries = a_p_entries_resized;
  _GLIBCXX_DEBUG_ONLY(assert_valid();)
}

#include <ext/pb_ds/detail/cc_hash_table_map_/resize_no_store_hash_fn_imps.hpp>
#include <ext/pb_ds/detail/cc_hash_table_map_/resize_store_hash_fn_imps.hpp>