1// -*- C++ -*-
2
3// Copyright (C) 2005, 2006 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library.  This library is free
6// software; you can redistribute it and/or modify it under the terms
7// of the GNU General Public License as published by the Free Software
8// Foundation; either version 2, or (at your option) any later
9// version.
10
11// This library is distributed in the hope that it will be useful, but
12// WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14// General Public License for more details.
15
16// You should have received a copy of the GNU General Public License
17// along with this library; see the file COPYING.  If not, write to
18// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
19// MA 02111-1307, USA.
20
21// As a special exception, you may use this file as part of a free
22// software library without restriction.  Specifically, if other files
23// instantiate templates or use macros or inline functions from this
24// file, or you compile this file and link it with other files to
25// produce an executable, this file does not by itself cause the
26// resulting executable to be covered by the GNU General Public
27// License.  This exception does not however invalidate any other
28// reasons why the executable file might be covered by the GNU General
29// Public License.
30
31// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
32
33// Permission to use, copy, modify, sell, and distribute this software
34// is hereby granted without fee, provided that the above copyright
35// notice appears in all copies, and that both that copyright notice
36// and this permission notice appear in supporting documentation. None
37// of the above authors, nor IBM Haifa Research Laboratories, make any
38// representation about the suitability of this software for any
39// purpose. It is provided "as is" without express or implied
40// warranty.
41
42/**
43 * @file hash_exponential_size_policy_imp.hpp
44 * Contains a resize size policy implementation.
45 */
46
47PB_DS_CLASS_T_DEC
48PB_DS_CLASS_C_DEC::
49hash_exponential_size_policy(size_type start_size, size_type grow_factor) :
50  m_start_size(start_size),
51  m_grow_factor(grow_factor)
52{ }
53
54PB_DS_CLASS_T_DEC
55void
56PB_DS_CLASS_C_DEC::
57swap(PB_DS_CLASS_C_DEC& other)
58{
59  std::swap(m_start_size, other.m_start_size);
60  std::swap(m_grow_factor, other.m_grow_factor);
61}
62
63PB_DS_CLASS_T_DEC
64typename PB_DS_CLASS_C_DEC::size_type
65PB_DS_CLASS_C_DEC::
66get_nearest_larger_size(size_type size) const
67{
68  size_type ret = m_start_size;
69  while (ret <= size)
70    {
71      const size_type next_ret = ret*  m_grow_factor;
72      if (next_ret < ret)
73	__throw_insert_error();
74      ret = next_ret;
75    }
76  return ret;
77}
78
79PB_DS_CLASS_T_DEC
80typename PB_DS_CLASS_C_DEC::size_type
81PB_DS_CLASS_C_DEC::
82get_nearest_smaller_size(size_type size) const
83{
84  size_type ret = m_start_size;
85  while (true)
86    {
87      const size_type next_ret = ret*  m_grow_factor;
88      if (next_ret < ret)
89	__throw_resize_error();
90      if (next_ret >= size)
91	return (ret);
92      ret = next_ret;
93    }
94  return ret;
95}
96
97