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_eq_fn.hpp 38 * Contains 2 eqivalence functions, one employing a hash value, 39 * and one ignoring it. 40 */ 41 42 #ifndef PB_DS_HASH_EQ_FN_HPP 43 #define PB_DS_HASH_EQ_FN_HPP 44 45 #include <utility> 46 #include <debug/debug.h> 47 48 namespace __gnu_pbds 49 { 50 namespace detail 51 { 52 template<typename Key, class Eq_Fn, class Allocator, bool Store_Hash> 53 struct hash_eq_fn; 54 55 #define PB_DS_CLASS_T_DEC \ 56 template<typename Key, class Eq_Fn, class Allocator> 57 58 #define PB_DS_CLASS_C_DEC \ 59 hash_eq_fn<Key, Eq_Fn, Allocator, false> 60 61 /** 62 * Specialization 1- The client requests that hash values not be stored. 63 **/ 64 template<typename Key, class Eq_Fn, class Allocator> 65 struct hash_eq_fn<Key, Eq_Fn, Allocator, false> : public Eq_Fn 66 { 67 typedef Eq_Fn eq_fn_base; 68 69 typedef typename Allocator::template rebind<Key>::other key_allocator; 70 71 typedef typename key_allocator::const_reference const_key_reference; 72 73 hash_eq_fn(); 74 75 hash_eq_fn(const Eq_Fn& r_eq_fn); 76 77 inline bool 78 operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const; 79 80 inline void 81 swap(const PB_DS_CLASS_C_DEC& other); 82 }; 83 84 PB_DS_CLASS_T_DEC 85 PB_DS_CLASS_C_DEC:: 86 hash_eq_fn() 87 { } 88 89 PB_DS_CLASS_T_DEC 90 inline void 91 PB_DS_CLASS_C_DEC:: 92 swap(const PB_DS_CLASS_C_DEC& other) 93 { std::swap((Eq_Fn& )(*this), (Eq_Fn& )other); } 94 95 PB_DS_CLASS_T_DEC 96 PB_DS_CLASS_C_DEC:: 97 hash_eq_fn(const Eq_Fn& r_eq_fn) : 98 Eq_Fn(r_eq_fn) 99 { } 100 101 PB_DS_CLASS_T_DEC 102 inline bool 103 PB_DS_CLASS_C_DEC:: 104 operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const 105 { return (eq_fn_base::operator()(r_lhs_key, r_rhs_key)); } 106 107 #undef PB_DS_CLASS_T_DEC 108 #undef PB_DS_CLASS_C_DEC 109 110 #define PB_DS_CLASS_T_DEC \ 111 template<typename Key, class Eq_Fn, class Allocator> 112 113 #define PB_DS_CLASS_C_DEC \ 114 hash_eq_fn<Key, Eq_Fn, Allocator, true> 115 116 /** 117 * Specialization 2- The client requests that hash values be stored. 118 **/ 119 template<typename Key, class Eq_Fn, class Allocator> 120 struct hash_eq_fn<Key, Eq_Fn, Allocator, true> : 121 public Eq_Fn 122 { 123 typedef typename Allocator::size_type size_type; 124 125 typedef Eq_Fn eq_fn_base; 126 127 typedef typename Allocator::template rebind<Key>::other key_allocator; 128 129 typedef typename key_allocator::const_reference const_key_reference; 130 131 hash_eq_fn(); 132 133 hash_eq_fn(const Eq_Fn& r_eq_fn); 134 135 inline bool 136 operator()(const_key_reference r_lhs_key, size_type lhs_hash, 137 const_key_reference r_rhs_key, size_type rhs_hash) const; 138 139 inline void 140 swap(const PB_DS_CLASS_C_DEC& other); 141 }; 142 143 PB_DS_CLASS_T_DEC 144 PB_DS_CLASS_C_DEC:: 145 hash_eq_fn() 146 { } 147 148 PB_DS_CLASS_T_DEC 149 PB_DS_CLASS_C_DEC:: 150 hash_eq_fn(const Eq_Fn& r_eq_fn) : 151 Eq_Fn(r_eq_fn) 152 { } 153 154 PB_DS_CLASS_T_DEC 155 inline bool 156 PB_DS_CLASS_C_DEC:: 157 operator()(const_key_reference r_lhs_key, size_type lhs_hash, 158 const_key_reference r_rhs_key, size_type rhs_hash) const 159 { 160 _GLIBCXX_DEBUG_ASSERT(!eq_fn_base::operator()(r_lhs_key, r_rhs_key) 161 || lhs_hash == rhs_hash); 162 163 return (lhs_hash == rhs_hash && 164 eq_fn_base::operator()(r_lhs_key, r_rhs_key)); 165 } 166 167 PB_DS_CLASS_T_DEC 168 inline void 169 PB_DS_CLASS_C_DEC:: 170 swap(const PB_DS_CLASS_C_DEC& other) 171 { std::swap((Eq_Fn& )(*this), (Eq_Fn& )(other)); } 172 173 #undef PB_DS_CLASS_T_DEC 174 #undef PB_DS_CLASS_C_DEC 175 176 } // namespace detail 177 } // namespace __gnu_pbds 178 179 #endif 180
