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// -*- 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 hash_exponential_size_policy_imp.hpp

 * Contains an implementation of hash_exponential_size_policy.

 */

#ifdef PB_ASSOC_HT_EXPONENTIAL_SIZE_POLICY_DEBUG

#define PB_ASSOC_DBG_ASSERT(X) assert(X)

#define PB_ASSOC_DBG_VERIFY(X) assert(X)

#define PB_ASSOC_DBG_ONLY(X) X

#else // #ifdef PB_ASSOC_HT_EXPONENTIAL_SIZE_POLICY_DEBUG

#define PB_ASSOC_DBG_ASSERT(X)

#define PB_ASSOC_DBG_VERIFY(X) {if((X)==0);}

#define PB_ASSOC_DBG_ONLY(X) ;

#endif // #ifdef PB_ASSOC_HT_EXPONENTIAL_SIZE_POLICY_DEBUG

PB_ASSOC_CLASS_T_DEC

PB_ASSOC_CLASS_C_DEC::

hash_exponential_size_policy(size_type start_size, size_type grow_factor) :

  m_start_size(start_size),

  m_grow_factor(grow_factor)

{ }

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

swap(PB_ASSOC_CLASS_C_DEC& r_other)

{

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

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

}

PB_ASSOC_CLASS_T_DEC

typename PB_ASSOC_CLASS_C_DEC::size_type

PB_ASSOC_CLASS_C_DEC::

get_init_size(size_type suggested_size) const

{

  size_type ret = m_start_size;

  while (ret < suggested_size)

    ret *=  m_grow_factor;

  return (ret);

}

PB_ASSOC_CLASS_T_DEC

typename PB_ASSOC_CLASS_C_DEC::size_type

PB_ASSOC_CLASS_C_DEC::

get_nearest_larger_size(size_type cur_size) const

{

  PB_ASSOC_DBG_ONLY(assert_is_one_of_my_sizes(size);)

    const size_type pot_ret = cur_size*  m_grow_factor;

  return ((pot_ret > cur_size)? pot_ret : cur_size);

}

PB_ASSOC_CLASS_T_DEC

typename PB_ASSOC_CLASS_C_DEC::size_type

PB_ASSOC_CLASS_C_DEC::

get_nearest_smaller_size(size_type cur_size) const

{

  PB_ASSOC_DBG_ONLY(assert_is_one_of_my_sizes(size);)

    const size_type pot_ret = cur_size / m_grow_factor;

  return ((pot_ret > 0)? pot_ret : m_start_size);

}

#ifdef PB_ASSOC_HT_EXPONENTIAL_SIZE_POLICY_DEBUG

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

assert_is_one_of_my_sizes(size_type size)

{

  PB_ASSOC_DBG_ASSERT(size >= m_start_size);

  while (size >m_start_size)

    size /= m_grow_factor;

  PB_ASSOC_DBG_ASSERT(size == m_start_size);

}

#endif // #ifdef PB_ASSOC_HT_EXPONENTIAL_SIZE_POLICY_DEBUG