1 // -*- C++ -*- 2 3 // Copyright (C) 2005, 2006, 2009 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 41 PB_DS_CLASS_T_DEC 42 PB_DS_CLASS_C_DEC:: 43 hash_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 48 PB_DS_CLASS_T_DEC 49 void 50 PB_DS_CLASS_C_DEC:: 51 swap(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 57 PB_DS_CLASS_T_DEC 58 typename PB_DS_CLASS_C_DEC::size_type 59 PB_DS_CLASS_C_DEC:: 60 get_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 73 PB_DS_CLASS_T_DEC 74 typename PB_DS_CLASS_C_DEC::size_type 75 PB_DS_CLASS_C_DEC:: 76 get_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
