1169691Skan// -*- C++ -*- 2169691Skan 3169691Skan// Copyright (C) 2005, 2006 Free Software Foundation, Inc. 4169691Skan// 5169691Skan// This file is part of the GNU ISO C++ Library. This library is free 6169691Skan// software; you can redistribute it and/or modify it under the terms 7169691Skan// of the GNU General Public License as published by the Free Software 8169691Skan// Foundation; either version 2, or (at your option) any later 9169691Skan// version. 10169691Skan 11169691Skan// This library is distributed in the hope that it will be useful, but 12169691Skan// WITHOUT ANY WARRANTY; without even the implied warranty of 13169691Skan// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14169691Skan// General Public License for more details. 15169691Skan 16169691Skan// You should have received a copy of the GNU General Public License 17169691Skan// along with this library; see the file COPYING. If not, write to 18169691Skan// the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 19169691Skan// MA 02111-1307, USA. 20169691Skan 21169691Skan// As a special exception, you may use this file as part of a free 22169691Skan// software library without restriction. Specifically, if other files 23169691Skan// instantiate templates or use macros or inline functions from this 24169691Skan// file, or you compile this file and link it with other files to 25169691Skan// produce an executable, this file does not by itself cause the 26169691Skan// resulting executable to be covered by the GNU General Public 27169691Skan// License. This exception does not however invalidate any other 28169691Skan// reasons why the executable file might be covered by the GNU General 29169691Skan// Public License. 30169691Skan 31169691Skan// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 32169691Skan 33169691Skan// Permission to use, copy, modify, sell, and distribute this software 34169691Skan// is hereby granted without fee, provided that the above copyright 35169691Skan// notice appears in all copies, and that both that copyright notice 36169691Skan// and this permission notice appear in supporting documentation. None 37169691Skan// of the above authors, nor IBM Haifa Research Laboratories, make any 38169691Skan// representation about the suitability of this software for any 39169691Skan// purpose. It is provided "as is" without express or implied 40169691Skan// warranty. 41169691Skan 42169691Skan/** 43169691Skan * @file hash_eq_fn.hpp 44169691Skan * Contains 2 eqivalence functions, one employing a hash value, 45169691Skan * and one ignoring it. 46169691Skan */ 47169691Skan 48169691Skan#ifndef PB_DS_HASH_EQ_FN_HPP 49169691Skan#define PB_DS_HASH_EQ_FN_HPP 50169691Skan 51169691Skan#include <utility> 52169691Skan#include <debug/debug.h> 53169691Skan 54169691Skannamespace pb_ds 55169691Skan{ 56169691Skan namespace detail 57169691Skan { 58169691Skan template<typename Key, class Eq_Fn, class Allocator, bool Store_Hash> 59169691Skan struct hash_eq_fn; 60169691Skan 61169691Skan#define PB_DS_CLASS_T_DEC \ 62169691Skan template<typename Key, class Eq_Fn, class Allocator> 63169691Skan 64169691Skan#define PB_DS_CLASS_C_DEC \ 65169691Skan hash_eq_fn<Key, Eq_Fn, Allocator, false> 66169691Skan 67169691Skan /** 68169691Skan * Specialization 1- The client requests that hash values not be stored. 69169691Skan **/ 70169691Skan template<typename Key, class Eq_Fn, class Allocator> 71169691Skan struct hash_eq_fn<Key, Eq_Fn, Allocator, false> : public Eq_Fn 72169691Skan { 73169691Skan typedef Eq_Fn eq_fn_base; 74169691Skan 75169691Skan typedef typename Allocator::template rebind<Key>::other key_allocator; 76169691Skan 77169691Skan typedef typename key_allocator::const_reference const_key_reference; 78169691Skan 79169691Skan hash_eq_fn(); 80169691Skan 81169691Skan hash_eq_fn(const Eq_Fn& r_eq_fn); 82169691Skan 83169691Skan inline bool 84169691Skan operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const; 85169691Skan 86169691Skan inline void 87169691Skan swap(const PB_DS_CLASS_C_DEC& other); 88169691Skan }; 89169691Skan 90169691Skan PB_DS_CLASS_T_DEC 91169691Skan PB_DS_CLASS_C_DEC:: 92169691Skan hash_eq_fn() 93169691Skan { } 94169691Skan 95169691Skan PB_DS_CLASS_T_DEC 96169691Skan inline void 97169691Skan PB_DS_CLASS_C_DEC:: 98169691Skan swap(const PB_DS_CLASS_C_DEC& other) 99169691Skan { std::swap((Eq_Fn& )(*this), (Eq_Fn& )other); } 100169691Skan 101169691Skan PB_DS_CLASS_T_DEC 102169691Skan PB_DS_CLASS_C_DEC:: 103169691Skan hash_eq_fn(const Eq_Fn& r_eq_fn) : 104169691Skan Eq_Fn(r_eq_fn) 105169691Skan { } 106169691Skan 107169691Skan PB_DS_CLASS_T_DEC 108169691Skan inline bool 109169691Skan PB_DS_CLASS_C_DEC:: 110169691Skan operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const 111169691Skan { return (eq_fn_base::operator()(r_lhs_key, r_rhs_key)); } 112169691Skan 113169691Skan#undef PB_DS_CLASS_T_DEC 114169691Skan#undef PB_DS_CLASS_C_DEC 115169691Skan 116169691Skan#define PB_DS_CLASS_T_DEC \ 117169691Skan template<typename Key, class Eq_Fn, class Allocator> 118169691Skan 119169691Skan#define PB_DS_CLASS_C_DEC \ 120169691Skan hash_eq_fn<Key, Eq_Fn, Allocator, true> 121169691Skan 122169691Skan /** 123169691Skan * Specialization 2- The client requests that hash values be stored. 124169691Skan **/ 125169691Skan template<typename Key, class Eq_Fn, class Allocator> 126169691Skan struct hash_eq_fn<Key, Eq_Fn, Allocator, true> : 127169691Skan public Eq_Fn 128169691Skan { 129169691Skan typedef typename Allocator::size_type size_type; 130169691Skan 131169691Skan typedef Eq_Fn eq_fn_base; 132169691Skan 133169691Skan typedef typename Allocator::template rebind<Key>::other key_allocator; 134169691Skan 135169691Skan typedef typename key_allocator::const_reference const_key_reference; 136169691Skan 137169691Skan hash_eq_fn(); 138169691Skan 139169691Skan hash_eq_fn(const Eq_Fn& r_eq_fn); 140169691Skan 141169691Skan inline bool 142169691Skan operator()(const_key_reference r_lhs_key, size_type lhs_hash, 143169691Skan const_key_reference r_rhs_key, size_type rhs_hash) const; 144169691Skan 145169691Skan inline void 146169691Skan swap(const PB_DS_CLASS_C_DEC& other); 147169691Skan }; 148169691Skan 149169691Skan PB_DS_CLASS_T_DEC 150169691Skan PB_DS_CLASS_C_DEC:: 151169691Skan hash_eq_fn() 152169691Skan { } 153169691Skan 154169691Skan PB_DS_CLASS_T_DEC 155169691Skan PB_DS_CLASS_C_DEC:: 156169691Skan hash_eq_fn(const Eq_Fn& r_eq_fn) : 157169691Skan Eq_Fn(r_eq_fn) 158169691Skan { } 159169691Skan 160169691Skan PB_DS_CLASS_T_DEC 161169691Skan inline bool 162169691Skan PB_DS_CLASS_C_DEC:: 163169691Skan operator()(const_key_reference r_lhs_key, size_type lhs_hash, 164169691Skan const_key_reference r_rhs_key, size_type rhs_hash) const 165169691Skan { 166169691Skan _GLIBCXX_DEBUG_ASSERT(!eq_fn_base::operator()(r_lhs_key, r_rhs_key) 167169691Skan || lhs_hash == rhs_hash); 168169691Skan 169169691Skan return (lhs_hash == rhs_hash && 170169691Skan eq_fn_base::operator()(r_lhs_key, r_rhs_key)); 171169691Skan } 172169691Skan 173169691Skan PB_DS_CLASS_T_DEC 174169691Skan inline void 175169691Skan PB_DS_CLASS_C_DEC:: 176169691Skan swap(const PB_DS_CLASS_C_DEC& other) 177169691Skan { std::swap((Eq_Fn& )(*this), (Eq_Fn& )(other)); } 178169691Skan 179169691Skan#undef PB_DS_CLASS_T_DEC 180169691Skan#undef PB_DS_CLASS_C_DEC 181169691Skan 182169691Skan } // namespace detail 183169691Skan} // namespace pb_ds 184169691Skan 185169691Skan#endif 186