1// -*- C++ -*- 2 3// Copyright (C) 2005-2020 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#ifdef PB_DS_CLASS_C_DEC 42 43PB_DS_CLASS_T_DEC 44PB_DS_CLASS_C_DEC:: 45hash_exponential_size_policy(size_type start_size, size_type grow_factor) : 46 m_start_size(start_size), 47 m_grow_factor(grow_factor) 48{ } 49 50PB_DS_CLASS_T_DEC 51void 52PB_DS_CLASS_C_DEC:: 53swap(PB_DS_CLASS_C_DEC& other) 54{ 55 std::swap(m_start_size, other.m_start_size); 56 std::swap(m_grow_factor, other.m_grow_factor); 57} 58 59PB_DS_CLASS_T_DEC 60typename PB_DS_CLASS_C_DEC::size_type 61PB_DS_CLASS_C_DEC:: 62get_nearest_larger_size(size_type size) const 63{ 64 size_type ret = m_start_size; 65 while (ret <= size) 66 { 67 const size_type next_ret = ret* m_grow_factor; 68 if (next_ret < ret) 69 __throw_insert_error(); 70 ret = next_ret; 71 } 72 return ret; 73} 74 75PB_DS_CLASS_T_DEC 76typename PB_DS_CLASS_C_DEC::size_type 77PB_DS_CLASS_C_DEC:: 78get_nearest_smaller_size(size_type size) const 79{ 80 size_type ret = m_start_size; 81 while (true) 82 { 83 const size_type next_ret = ret* m_grow_factor; 84 if (next_ret < ret) 85 __throw_resize_error(); 86 if (next_ret >= size) 87 return (ret); 88 ret = next_ret; 89 } 90 return ret; 91} 92 93#endif 94