release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/include/c++/4.5.3/ext/pb_ds/detail/eq_fn/hash_eq_fn.hpp

   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