1// -*- C++ -*- 2 3// Copyright (C) 2005-2013 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 3, 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// Under Section 7 of GPL version 3, you are granted additional 17// permissions described in the GCC Runtime Library Exception, version 18// 3.1, as published by the Free Software Foundation. 19 20// You should have received a copy of the GNU General Public License and 21// a copy of the GCC Runtime Library Exception along with this program; 22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23// <http://www.gnu.org/licenses/>. 24 25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 26 27// Permission to use, copy, modify, sell, and distribute this software 28// is hereby granted without fee, provided that the above copyright 29// notice appears in all copies, and that both that copyright notice 30// and this permission notice appear in supporting documentation. None 31// of the above authors, nor IBM Haifa Research Laboratories, make any 32// representation about the suitability of this software for any 33// purpose. It is provided "as is" without express or implied 34// warranty. 35 36/** 37 * @file hash_exponential_size_policy_imp.hpp 38 * Contains a resize size policy implementation. 39 */ 40 41PB_DS_CLASS_T_DEC 42PB_DS_CLASS_C_DEC:: 43hash_exponential_size_policy(size_type start_size, size_type grow_factor) : 44 m_start_size(start_size), 45 m_grow_factor(grow_factor) 46{ } 47 48PB_DS_CLASS_T_DEC 49void 50PB_DS_CLASS_C_DEC:: 51swap(PB_DS_CLASS_C_DEC& other) 52{ 53 std::swap(m_start_size, other.m_start_size); 54 std::swap(m_grow_factor, other.m_grow_factor); 55} 56 57PB_DS_CLASS_T_DEC 58typename PB_DS_CLASS_C_DEC::size_type 59PB_DS_CLASS_C_DEC:: 60get_nearest_larger_size(size_type size) const 61{ 62 size_type ret = m_start_size; 63 while (ret <= size) 64 { 65 const size_type next_ret = ret* m_grow_factor; 66 if (next_ret < ret) 67 __throw_insert_error(); 68 ret = next_ret; 69 } 70 return ret; 71} 72 73PB_DS_CLASS_T_DEC 74typename PB_DS_CLASS_C_DEC::size_type 75PB_DS_CLASS_C_DEC:: 76get_nearest_smaller_size(size_type size) const 77{ 78 size_type ret = m_start_size; 79 while (true) 80 { 81 const size_type next_ret = ret* m_grow_factor; 82 if (next_ret < ret) 83 __throw_resize_error(); 84 if (next_ret >= size) 85 return (ret); 86 ret = next_ret; 87 } 88 return ret; 89} 90 91