hash_eq_fn.hpp revision 169691
1127342Smlaier// -*- C++ -*- 2127342Smlaier 3127342Smlaier// Copyright (C) 2005, 2006 Free Software Foundation, Inc. 4127342Smlaier// 5127342Smlaier// This file is part of the GNU ISO C++ Library. This library is free 6127342Smlaier// software; you can redistribute it and/or modify it under the terms 7135306Skeramida// of the GNU General Public License as published by the Free Software 8127342Smlaier// Foundation; either version 2, or (at your option) any later 9136224Smtm// version. 10127342Smlaier 11127342Smlaier// This library is distributed in the hope that it will be useful, but 12127342Smlaier// WITHOUT ANY WARRANTY; without even the implied warranty of 13127342Smlaier// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14127342Smlaier// General Public License for more details. 15127342Smlaier 16127342Smlaier// You should have received a copy of the GNU General Public License 17127342Smlaier// along with this library; see the file COPYING. If not, write to 18127342Smlaier// the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 19127342Smlaier// MA 02111-1307, USA. 20136942Spjd 21136942Spjd// As a special exception, you may use this file as part of a free 22127342Smlaier// software library without restriction. Specifically, if other files 23127342Smlaier// instantiate templates or use macros or inline functions from this 24127342Smlaier// file, or you compile this file and link it with other files to 25127342Smlaier// produce an executable, this file does not by itself cause the 26127342Smlaier// resulting executable to be covered by the GNU General Public 27127342Smlaier// License. This exception does not however invalidate any other 28136942Spjd// reasons why the executable file might be covered by the GNU General 29127342Smlaier// Public License. 30127342Smlaier 31127342Smlaier// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 32127342Smlaier 33127342Smlaier// Permission to use, copy, modify, sell, and distribute this software 34127342Smlaier// is hereby granted without fee, provided that the above copyright 35127342Smlaier// notice appears in all copies, and that both that copyright notice 36127342Smlaier// and this permission notice appear in supporting documentation. None 37127342Smlaier// of the above authors, nor IBM Haifa Research Laboratories, make any 38127342Smlaier// representation about the suitability of this software for any 39127342Smlaier// purpose. It is provided "as is" without express or implied 40127342Smlaier// warranty. 41127342Smlaier 42136942Spjd/** 43127342Smlaier * @file hash_eq_fn.hpp 44127342Smlaier * Contains 2 eqivalence functions, one employing a hash value, 45127342Smlaier * and one ignoring it. 46127342Smlaier */ 47127342Smlaier 48127342Smlaier#ifndef PB_DS_HASH_EQ_FN_HPP 49127342Smlaier#define PB_DS_HASH_EQ_FN_HPP 50127342Smlaier 51127342Smlaier#include <utility> 52136942Spjd#include <debug/debug.h> 53130954Smlaier 54130954Smlaiernamespace pb_ds 55130954Smlaier{ 56127342Smlaier namespace detail 57127342Smlaier { 58127342Smlaier template<typename Key, class Eq_Fn, class Allocator, bool Store_Hash> 59127342Smlaier struct hash_eq_fn; 60127342Smlaier 61127342Smlaier#define PB_DS_CLASS_T_DEC \ 62127342Smlaier template<typename Key, class Eq_Fn, class Allocator> 63127342Smlaier 64127342Smlaier#define PB_DS_CLASS_C_DEC \ 65127342Smlaier hash_eq_fn<Key, Eq_Fn, Allocator, false> 66136942Spjd 67136942Spjd /** 68136942Spjd * Specialization 1- The client requests that hash values not be stored. 69136942Spjd **/ 70136942Spjd template<typename Key, class Eq_Fn, class Allocator> 71136942Spjd struct hash_eq_fn<Key, Eq_Fn, Allocator, false> : public Eq_Fn 72136942Spjd { 73127342Smlaier typedef Eq_Fn eq_fn_base; 74127342Smlaier 75127342Smlaier typedef typename Allocator::template rebind<Key>::other key_allocator; 76127342Smlaier 77136942Spjd typedef typename key_allocator::const_reference const_key_reference; 78127342Smlaier 79136942Spjd hash_eq_fn(); 80127342Smlaier 81127342Smlaier hash_eq_fn(const Eq_Fn& r_eq_fn); 82127342Smlaier 83127342Smlaier inline bool 84127342Smlaier operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const; 85127342Smlaier 86127342Smlaier inline void 87127342Smlaier swap(const PB_DS_CLASS_C_DEC& other); 88127342Smlaier }; 89127342Smlaier 90127342Smlaier PB_DS_CLASS_T_DEC 91127342Smlaier PB_DS_CLASS_C_DEC:: 92127342Smlaier hash_eq_fn() 93127342Smlaier { } 94127342Smlaier 95127342Smlaier PB_DS_CLASS_T_DEC 96127342Smlaier inline void 97 PB_DS_CLASS_C_DEC:: 98 swap(const PB_DS_CLASS_C_DEC& other) 99 { std::swap((Eq_Fn& )(*this), (Eq_Fn& )other); } 100 101 PB_DS_CLASS_T_DEC 102 PB_DS_CLASS_C_DEC:: 103 hash_eq_fn(const Eq_Fn& r_eq_fn) : 104 Eq_Fn(r_eq_fn) 105 { } 106 107 PB_DS_CLASS_T_DEC 108 inline bool 109 PB_DS_CLASS_C_DEC:: 110 operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const 111 { return (eq_fn_base::operator()(r_lhs_key, r_rhs_key)); } 112 113#undef PB_DS_CLASS_T_DEC 114#undef PB_DS_CLASS_C_DEC 115 116#define PB_DS_CLASS_T_DEC \ 117 template<typename Key, class Eq_Fn, class Allocator> 118 119#define PB_DS_CLASS_C_DEC \ 120 hash_eq_fn<Key, Eq_Fn, Allocator, true> 121 122 /** 123 * Specialization 2- The client requests that hash values be stored. 124 **/ 125 template<typename Key, class Eq_Fn, class Allocator> 126 struct hash_eq_fn<Key, Eq_Fn, Allocator, true> : 127 public Eq_Fn 128 { 129 typedef typename Allocator::size_type size_type; 130 131 typedef Eq_Fn eq_fn_base; 132 133 typedef typename Allocator::template rebind<Key>::other key_allocator; 134 135 typedef typename key_allocator::const_reference const_key_reference; 136 137 hash_eq_fn(); 138 139 hash_eq_fn(const Eq_Fn& r_eq_fn); 140 141 inline bool 142 operator()(const_key_reference r_lhs_key, size_type lhs_hash, 143 const_key_reference r_rhs_key, size_type rhs_hash) const; 144 145 inline void 146 swap(const PB_DS_CLASS_C_DEC& other); 147 }; 148 149 PB_DS_CLASS_T_DEC 150 PB_DS_CLASS_C_DEC:: 151 hash_eq_fn() 152 { } 153 154 PB_DS_CLASS_T_DEC 155 PB_DS_CLASS_C_DEC:: 156 hash_eq_fn(const Eq_Fn& r_eq_fn) : 157 Eq_Fn(r_eq_fn) 158 { } 159 160 PB_DS_CLASS_T_DEC 161 inline bool 162 PB_DS_CLASS_C_DEC:: 163 operator()(const_key_reference r_lhs_key, size_type lhs_hash, 164 const_key_reference r_rhs_key, size_type rhs_hash) const 165 { 166 _GLIBCXX_DEBUG_ASSERT(!eq_fn_base::operator()(r_lhs_key, r_rhs_key) 167 || lhs_hash == rhs_hash); 168 169 return (lhs_hash == rhs_hash && 170 eq_fn_base::operator()(r_lhs_key, r_rhs_key)); 171 } 172 173 PB_DS_CLASS_T_DEC 174 inline void 175 PB_DS_CLASS_C_DEC:: 176 swap(const PB_DS_CLASS_C_DEC& other) 177 { std::swap((Eq_Fn& )(*this), (Eq_Fn& )(other)); } 178 179#undef PB_DS_CLASS_T_DEC 180#undef PB_DS_CLASS_C_DEC 181 182 } // namespace detail 183} // namespace pb_ds 184 185#endif 186