mod_based_range_hashing.hpp revision 169692
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 mod_based_range_hashing.hpp 44 * Contains a range hashing policy base. 45 */ 46 47#ifndef PB_DS_MOD_BASED_RANGE_HASHING_HPP 48#define PB_DS_MOD_BASED_RANGE_HASHING_HPP 49 50namespace pb_ds 51{ 52 53 namespace detail 54 { 55 56#define PB_DS_CLASS_T_DEC \ 57 template<typename Size_Type> 58 59#define PB_DS_CLASS_C_DEC \ 60 mod_based_range_hashing< \ 61 Size_Type> 62 63 template<typename Size_Type> 64 class mod_based_range_hashing 65 { 66 protected: 67 typedef Size_Type size_type; 68 69 protected: 70 void 71 swap(PB_DS_CLASS_C_DEC& other); 72 73 void 74 notify_resized(size_type size); 75 76 inline size_type 77 range_hash(size_type hash) const; 78 79 private: 80 size_type m_size; 81 }; 82 83 PB_DS_CLASS_T_DEC 84 void 85 PB_DS_CLASS_C_DEC:: 86 swap(PB_DS_CLASS_C_DEC& other) 87 { 88 std::swap(m_size, other.m_size); 89 } 90 91 PB_DS_CLASS_T_DEC 92 void 93 PB_DS_CLASS_C_DEC:: 94 notify_resized(size_type size) 95 { 96 m_size = size; 97 } 98 99 PB_DS_CLASS_T_DEC 100 inline typename PB_DS_CLASS_C_DEC::size_type 101 PB_DS_CLASS_C_DEC:: 102 range_hash(size_type hash) const 103 { 104 return (hash % m_size); 105 } 106 107#undef PB_DS_CLASS_T_DEC 108#undef PB_DS_CLASS_C_DEC 109 110 } // namespace detail 111 112} // namespace pb_ds 113 114#endif // #ifndef PB_DS_MOD_BASED_RANGE_HASHING_HPP 115