hash_eq_fn.hpp revision 285830
178344Sobrien// -*- C++ -*- 278344Sobrien 398184Sgordon// Copyright (C) 2005, 2006 Free Software Foundation, Inc. 478344Sobrien// 578344Sobrien// This file is part of the GNU ISO C++ Library. This library is free 678344Sobrien// software; you can redistribute it and/or modify it under the terms 7240336Sobrien// of the GNU General Public License as published by the Free Software 898184Sgordon// Foundation; either version 2, or (at your option) any later 9136224Smtm// version. 1078344Sobrien 1178344Sobrien// This library is distributed in the hope that it will be useful, but 1278344Sobrien// WITHOUT ANY WARRANTY; without even the implied warranty of 1378344Sobrien// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14230099Sdougb// General Public License for more details. 15151809Syar 16124618Smtm// You should have received a copy of the GNU General Public License 1778344Sobrien// along with this library; see the file COPYING. If not, write to 1898184Sgordon// the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 1998184Sgordon// MA 02111-1307, USA. 20113959Smtm 21113959Smtm// As a special exception, you may use this file as part of a free 22113959Smtm// software library without restriction. Specifically, if other files 23210734Sjilles// instantiate templates or use macros or inline functions from this 24113959Smtm// file, or you compile this file and link it with other files to 25113959Smtm// produce an executable, this file does not by itself cause the 26255450Scy// resulting executable to be covered by the GNU General Public 27113959Smtm// License. This exception does not however invalidate any other 28104980Sschweikh// reasons why the executable file might be covered by the GNU General 2998184Sgordon// Public License. 3098184Sgordon 3198184Sgordon// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 3278344Sobrien 3378344Sobrien// 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 54namespace 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:: 92 hash_eq_fn() 93 { } 94 95 PB_DS_CLASS_T_DEC 96 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