11573Srgrimes// -*- C++ -*- 21573Srgrimes 31573Srgrimes// Copyright (C) 2005, 2006 Free Software Foundation, Inc. 41573Srgrimes// 51573Srgrimes// This file is part of the GNU ISO C++ Library. This library is free 61573Srgrimes// software; you can redistribute it and/or modify it under the terms 71573Srgrimes// of the GNU General Public License as published by the Free Software 81573Srgrimes// Foundation; either version 2, or (at your option) any later 91573Srgrimes// version. 101573Srgrimes 111573Srgrimes// This library is distributed in the hope that it will be useful, but 121573Srgrimes// WITHOUT ANY WARRANTY; without even the implied warranty of 131573Srgrimes// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 141573Srgrimes// General Public License for more details. 151573Srgrimes 16251069Semaste// You should have received a copy of the GNU General Public License 171573Srgrimes// along with this library; see the file COPYING. If not, write to 181573Srgrimes// the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 191573Srgrimes// MA 02111-1307, USA. 201573Srgrimes 211573Srgrimes// As a special exception, you may use this file as part of a free 221573Srgrimes// software library without restriction. Specifically, if other files 231573Srgrimes// instantiate templates or use macros or inline functions from this 241573Srgrimes// file, or you compile this file and link it with other files to 251573Srgrimes// produce an executable, this file does not by itself cause the 261573Srgrimes// resulting executable to be covered by the GNU General Public 271573Srgrimes// License. This exception does not however invalidate any other 281573Srgrimes// reasons why the executable file might be covered by the GNU General 291573Srgrimes// Public License. 301573Srgrimes 311573Srgrimes// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 321573Srgrimes 331573Srgrimes// Permission to use, copy, modify, sell, and distribute this software 341573Srgrimes// is hereby granted without fee, provided that the above copyright 351573Srgrimes// notice appears in all copies, and that both that copyright notice 3686170Sobrien// and this permission notice appear in supporting documentation. None 3786170Sobrien// of the above authors, nor IBM Haifa Research Laboratories, make any 381573Srgrimes// representation about the suitability of this software for any 39121531Speter// purpose. It is provided "as is" without express or implied 40121531Speter// warranty. 411573Srgrimes 421573Srgrimes/** 431573Srgrimes * @file hash_eq_fn.hpp 441573Srgrimes * Contains 2 eqivalence functions, one employing a hash value, 451573Srgrimes * and one ignoring it. 461573Srgrimes */ 471573Srgrimes 481573Srgrimes#ifndef PB_DS_HASH_EQ_FN_HPP 491573Srgrimes#define PB_DS_HASH_EQ_FN_HPP 501573Srgrimes 511573Srgrimes#include <utility> 521573Srgrimes#include <debug/debug.h> 531573Srgrimes 541573Srgrimesnamespace pb_ds 55102809Srobert{ 56102809Srobert namespace detail 57102809Srobert { 58102809Srobert template<typename Key, class Eq_Fn, class Allocator, bool Store_Hash> 591573Srgrimes struct hash_eq_fn; 60102809Srobert 611573Srgrimes#define PB_DS_CLASS_T_DEC \ 62102809Srobert template<typename Key, class Eq_Fn, class Allocator> 63102809Srobert 64102809Srobert#define PB_DS_CLASS_C_DEC \ 651573Srgrimes hash_eq_fn<Key, Eq_Fn, Allocator, false> 66102809Srobert 67102809Srobert /** 681573Srgrimes * Specialization 1- The client requests that hash values not be stored. 69102809Srobert **/ 701573Srgrimes template<typename Key, class Eq_Fn, class Allocator> 711573Srgrimes struct hash_eq_fn<Key, Eq_Fn, Allocator, false> : public Eq_Fn 7292889Sobrien { 7392889Sobrien typedef Eq_Fn eq_fn_base; 7492889Sobrien 751573Srgrimes typedef typename Allocator::template rebind<Key>::other key_allocator; 761573Srgrimes 771573Srgrimes typedef typename key_allocator::const_reference const_key_reference; 781573Srgrimes 791573Srgrimes hash_eq_fn(); 801573Srgrimes 811573Srgrimes hash_eq_fn(const Eq_Fn& r_eq_fn); 821573Srgrimes 831573Srgrimes inline bool 841573Srgrimes operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const; 851573Srgrimes 861573Srgrimes inline void 871573Srgrimes swap(const PB_DS_CLASS_C_DEC& other); 881573Srgrimes }; 89121531Speter 90121531Speter PB_DS_CLASS_T_DEC 911573Srgrimes PB_DS_CLASS_C_DEC:: 921573Srgrimes hash_eq_fn() 931573Srgrimes { } 941573Srgrimes 95121531Speter PB_DS_CLASS_T_DEC 961573Srgrimes inline void 971573Srgrimes PB_DS_CLASS_C_DEC:: 981573Srgrimes swap(const PB_DS_CLASS_C_DEC& other) 991573Srgrimes { std::swap((Eq_Fn& )(*this), (Eq_Fn& )other); } 1001573Srgrimes 1011573Srgrimes PB_DS_CLASS_T_DEC 1021573Srgrimes PB_DS_CLASS_C_DEC:: 1031573Srgrimes hash_eq_fn(const Eq_Fn& r_eq_fn) : 1041573Srgrimes Eq_Fn(r_eq_fn) 1051573Srgrimes { } 1061573Srgrimes 1071573Srgrimes PB_DS_CLASS_T_DEC 1081573Srgrimes inline bool 1091573Srgrimes PB_DS_CLASS_C_DEC:: 1101573Srgrimes operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const 1111573Srgrimes { return (eq_fn_base::operator()(r_lhs_key, r_rhs_key)); } 1121573Srgrimes 1131573Srgrimes#undef PB_DS_CLASS_T_DEC 1141573Srgrimes#undef PB_DS_CLASS_C_DEC 1151573Srgrimes 1161573Srgrimes#define PB_DS_CLASS_T_DEC \ 117121531Speter template<typename Key, class Eq_Fn, class Allocator> 118121531Speter 119121531Speter#define PB_DS_CLASS_C_DEC \ 1201573Srgrimes hash_eq_fn<Key, Eq_Fn, Allocator, true> 1211573Srgrimes 1221573Srgrimes /** 1231573Srgrimes * Specialization 2- The client requests that hash values be stored. 1241573Srgrimes **/ 1251573Srgrimes template<typename Key, class Eq_Fn, class Allocator> 1261573Srgrimes struct hash_eq_fn<Key, Eq_Fn, Allocator, true> : 1271573Srgrimes public Eq_Fn 1281573Srgrimes { 1291573Srgrimes typedef typename Allocator::size_type size_type; 1301573Srgrimes 1311573Srgrimes typedef Eq_Fn eq_fn_base; 1321573Srgrimes 1331573Srgrimes typedef typename Allocator::template rebind<Key>::other key_allocator; 1341573Srgrimes 1351573Srgrimes typedef typename key_allocator::const_reference const_key_reference; 1361573Srgrimes 1371573Srgrimes 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