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 hash_eq_fn.hpp 44 * Contains 2 eqivalence functions, one employing a hash value, 45 * and one ignoring it. 46 */ 47 48 #ifndef PB_DS_HASH_EQ_FN_HPP 49 #define PB_DS_HASH_EQ_FN_HPP 50 51 #include <utility> 52 #include <debug/debug.h> 53 54 namespace pb_ds 55 { 56 namespace detail 57 { 58 template<typename Key, class Eq_Fn, class Allocator, bool Store_Hash> 59 struct hash_eq_fn; 60 61 #define PB_DS_CLASS_T_DEC \ 62 template<typename Key, class Eq_Fn, class Allocator> 63 64 #define PB_DS_CLASS_C_DEC \ 65 hash_eq_fn<Key, Eq_Fn, Allocator, false> 66 67 /** 68 * Specialization 1- The client requests that hash values not be stored. 69 **/ 70 template<typename Key, class Eq_Fn, class Allocator> 71 struct hash_eq_fn<Key, Eq_Fn, Allocator, false> : public Eq_Fn 72 { 73 typedef Eq_Fn eq_fn_base; 74 75 typedef typename Allocator::template rebind<Key>::other key_allocator; 76 77 typedef typename key_allocator::const_reference const_key_reference; 78 79 hash_eq_fn(); 80 81 hash_eq_fn(const Eq_Fn& r_eq_fn); 82 83 inline bool 84 operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const; 85 86 inline void 87 swap(const PB_DS_CLASS_C_DEC& other); 88 }; 89 90 PB_DS_CLASS_T_DEC 91 PB_DS_CLASS_C_DEC:: hash_eq_fn()92 hash_eq_fn() 93 { } 94 95 PB_DS_CLASS_T_DEC 96 inline void 97 PB_DS_CLASS_C_DEC:: swap(const PB_DS_CLASS_C_DEC & other)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:: hash_eq_fn(const Eq_Fn & r_eq_fn)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:: operator ()(const_key_reference r_lhs_key,const_key_reference r_rhs_key) const110 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:: hash_eq_fn()151 hash_eq_fn() 152 { } 153 154 PB_DS_CLASS_T_DEC 155 PB_DS_CLASS_C_DEC:: hash_eq_fn(const Eq_Fn & r_eq_fn)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:: operator ()(const_key_reference r_lhs_key,size_type lhs_hash,const_key_reference r_rhs_key,size_type rhs_hash) const163 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:: swap(const PB_DS_CLASS_C_DEC & other)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