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/hash_fn/ranged_hash_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 ranged_hash_fn.hpp
  38  * Contains a unified ranged hash functor, allowing the hash tables
  39  * to deal with a single class for ranged hashing.
  40  */
  41
  42 #ifndef PB_DS_RANGED_HASH_FN_HPP
  43 #define PB_DS_RANGED_HASH_FN_HPP
  44
  45 #include <ext/pb_ds/detail/basic_types.hpp>
  46 #include <utility>
  47 #include <debug/debug.h>
  48
  49 namespace __gnu_pbds
  50 {
  51   namespace detail
  52   {
  53     template<typename Key, typename Hash_Fn, typename Allocator,
  54              typename Comb_Hash_Fn, bool Store_Hash>
  55     class ranged_hash_fn;
  56
  57 #define PB_DS_CLASS_T_DEC \
  58     template<typename Key, typename Hash_Fn, typename Allocator, \
  59              typename Comb_Hash_Fn>
  60
  61 #define PB_DS_CLASS_C_DEC \
  62     ranged_hash_fn<Key, Hash_Fn, Allocator, Comb_Hash_Fn, false>
  63
  64     /**
  65      * Specialization 1
  66      * The client supplies a hash function and a ranged hash function,
  67      * and requests that hash values not be stored.
  68      **/
  69     template<typename Key, typename Hash_Fn, typename Allocator,
  70              typename Comb_Hash_Fn>
  71     class ranged_hash_fn< Key, Hash_Fn, Allocator, Comb_Hash_Fn, false>
  72     : public Hash_Fn, public Comb_Hash_Fn
  73     {
  74     protected:
  75       typedef typename Allocator::size_type size_type;
  76       typedef Hash_Fn hash_fn_base;
  77       typedef Comb_Hash_Fn comb_hash_fn_base;
  78       typedef typename Allocator::template rebind< Key>::other key_allocator;
  79       typedef typename key_allocator::const_reference const_key_reference;
  80
  81       ranged_hash_fn(size_type);
  82
  83       ranged_hash_fn(size_type, const Hash_Fn&);
  84
  85       ranged_hash_fn(size_type, const Hash_Fn&, const Comb_Hash_Fn&);
  86
  87       void
  88       swap(PB_DS_CLASS_C_DEC&);
  89
  90       void
  91       notify_resized(size_type);
  92
  93       inline size_type
  94       operator()(const_key_reference) const;
  95     };
  96
  97     PB_DS_CLASS_T_DEC
  98     PB_DS_CLASS_C_DEC::
  99     ranged_hash_fn(size_type size)
 100     { Comb_Hash_Fn::notify_resized(size); }
 101
 102     PB_DS_CLASS_T_DEC
 103     PB_DS_CLASS_C_DEC::
 104     ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn)
 105     : Hash_Fn(r_hash_fn)
 106     { Comb_Hash_Fn::notify_resized(size); }
 107
 108     PB_DS_CLASS_T_DEC
 109     PB_DS_CLASS_C_DEC::
 110     ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn,
 111                    const Comb_Hash_Fn& r_comb_hash_fn)
 112     : Hash_Fn(r_hash_fn), Comb_Hash_Fn(r_comb_hash_fn)
 113     { comb_hash_fn_base::notify_resized(size); }
 114
 115     PB_DS_CLASS_T_DEC
 116     void
 117     PB_DS_CLASS_C_DEC::
 118     swap(PB_DS_CLASS_C_DEC& other)
 119     {
 120       comb_hash_fn_base::swap(other);
 121       std::swap((Hash_Fn& )(*this), (Hash_Fn& )other);
 122     }
 123
 124     PB_DS_CLASS_T_DEC
 125     void
 126     PB_DS_CLASS_C_DEC::
 127     notify_resized(size_type size)
 128     { comb_hash_fn_base::notify_resized(size); }
 129
 130     PB_DS_CLASS_T_DEC
 131     inline typename PB_DS_CLASS_C_DEC::size_type
 132     PB_DS_CLASS_C_DEC::
 133     operator()(const_key_reference r_key) const
 134     { return (comb_hash_fn_base::operator()(hash_fn_base::operator()(r_key)));}
 135
 136 #undef PB_DS_CLASS_T_DEC
 137 #undef PB_DS_CLASS_C_DEC
 138
 139 #define PB_DS_CLASS_T_DEC \
 140     template<typename Key, typename Hash_Fn, typename Allocator, \
 141              typename Comb_Hash_Fn>
 142
 143 #define PB_DS_CLASS_C_DEC \
 144     ranged_hash_fn<Key,Hash_Fn, Allocator, Comb_Hash_Fn, true>
 145
 146     /**
 147      * Specialization 2
 148      * The client supplies a hash function and a ranged hash function,
 149      * and requests that hash values be stored.
 150      **/
 151     template<typename Key, typename Hash_Fn, typename Allocator,
 152              typename Comb_Hash_Fn>
 153     class ranged_hash_fn<Key, Hash_Fn, Allocator, Comb_Hash_Fn, true>
 154     : public Hash_Fn, public Comb_Hash_Fn
 155     {
 156     protected:
 157       typedef typename Allocator::size_type size_type;
 158       typedef std::pair<size_type, size_type> comp_hash;
 159       typedef Hash_Fn hash_fn_base;
 160       typedef Comb_Hash_Fn comb_hash_fn_base;
 161       typedef typename Allocator::template rebind<Key>::other key_allocator;
 162       typedef typename key_allocator::const_reference const_key_reference;
 163
 164       ranged_hash_fn(size_type);
 165
 166       ranged_hash_fn(size_type, const Hash_Fn&);
 167
 168       ranged_hash_fn(size_type, const Hash_Fn&, const Comb_Hash_Fn&);
 169
 170       void
 171       swap(PB_DS_CLASS_C_DEC&);
 172
 173       void
 174       notify_resized(size_type);
 175
 176       inline comp_hash
 177       operator()(const_key_reference) const;
 178
 179       inline comp_hash
 180       operator()(const_key_reference, size_type) const;
 181     };
 182
 183     PB_DS_CLASS_T_DEC
 184     PB_DS_CLASS_C_DEC::
 185     ranged_hash_fn(size_type size)
 186     { Comb_Hash_Fn::notify_resized(size); }
 187
 188     PB_DS_CLASS_T_DEC
 189     PB_DS_CLASS_C_DEC::
 190     ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn) :
 191       Hash_Fn(r_hash_fn)
 192     { Comb_Hash_Fn::notify_resized(size); }
 193
 194     PB_DS_CLASS_T_DEC
 195     PB_DS_CLASS_C_DEC::
 196     ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn,
 197                    const Comb_Hash_Fn& r_comb_hash_fn)
 198     : Hash_Fn(r_hash_fn), Comb_Hash_Fn(r_comb_hash_fn)
 199     { comb_hash_fn_base::notify_resized(size); }
 200
 201     PB_DS_CLASS_T_DEC
 202     void
 203     PB_DS_CLASS_C_DEC::
 204     swap(PB_DS_CLASS_C_DEC& other)
 205     {
 206       comb_hash_fn_base::swap(other);
 207       std::swap((Hash_Fn& )(*this), (Hash_Fn& )other);
 208     }
 209
 210     PB_DS_CLASS_T_DEC
 211     void
 212     PB_DS_CLASS_C_DEC::
 213     notify_resized(size_type size)
 214     { comb_hash_fn_base::notify_resized(size); }
 215
 216     PB_DS_CLASS_T_DEC
 217     inline typename PB_DS_CLASS_C_DEC::comp_hash
 218     PB_DS_CLASS_C_DEC::
 219     operator()(const_key_reference r_key) const
 220     {
 221       const size_type hash = hash_fn_base::operator()(r_key);
 222       return std::make_pair(comb_hash_fn_base::operator()(hash), hash);
 223     }
 224
 225     PB_DS_CLASS_T_DEC
 226     inline typename PB_DS_CLASS_C_DEC::comp_hash
 227     PB_DS_CLASS_C_DEC::
 228     operator()
 229 #ifdef _GLIBCXX_DEBUG
 230       (const_key_reference r_key, size_type hash) const
 231 #else
 232       (const_key_reference /*r_key*/, size_type hash) const
 233 #endif
 234     {
 235       _GLIBCXX_DEBUG_ASSERT(hash == hash_fn_base::operator()(r_key));
 236       return std::make_pair(comb_hash_fn_base::operator()(hash), hash);
 237     }
 238
 239 #undef PB_DS_CLASS_T_DEC
 240 #undef PB_DS_CLASS_C_DEC
 241
 242 #define PB_DS_CLASS_T_DEC \
 243     template<typename Key, typename Allocator, typename Comb_Hash_Fn>
 244
 245 #define PB_DS_CLASS_C_DEC \
 246     ranged_hash_fn<Key, null_hash_fn, Allocator, Comb_Hash_Fn, false>
 247
 248     /**
 249      * Specialization 3
 250      * The client does not supply a hash function (by specifying
 251      * null_hash_fn as the Hash_Fn parameter), and requests that hash
 252      * values not be stored.
 253      **/
 254     template<typename Key, typename Allocator, typename Comb_Hash_Fn>
 255     class ranged_hash_fn<Key, null_hash_fn, Allocator, Comb_Hash_Fn, false>
 256     : public null_hash_fn, public Comb_Hash_Fn
 257     {
 258     protected:
 259       typedef typename Allocator::size_type size_type;
 260       typedef Comb_Hash_Fn comb_hash_fn_base;
 261
 262       ranged_hash_fn(size_type);
 263
 264       ranged_hash_fn(size_type, const Comb_Hash_Fn&);
 265
 266       ranged_hash_fn(size_type, const null_hash_fn&, const Comb_Hash_Fn&);
 267
 268       void
 269       swap(PB_DS_CLASS_C_DEC&);
 270     };
 271
 272     PB_DS_CLASS_T_DEC
 273     PB_DS_CLASS_C_DEC::
 274     ranged_hash_fn(size_type size)
 275     { Comb_Hash_Fn::notify_resized(size); }
 276
 277     PB_DS_CLASS_T_DEC
 278     PB_DS_CLASS_C_DEC::
 279     ranged_hash_fn(size_type size, const Comb_Hash_Fn& r_comb_hash_fn) :
 280       Comb_Hash_Fn(r_comb_hash_fn)
 281     { }
 282
 283     PB_DS_CLASS_T_DEC
 284     PB_DS_CLASS_C_DEC::
 285     ranged_hash_fn(size_type size, const null_hash_fn& r_null_hash_fn,
 286                    const Comb_Hash_Fn& r_comb_hash_fn)
 287     : Comb_Hash_Fn(r_comb_hash_fn)
 288     { }
 289
 290     PB_DS_CLASS_T_DEC
 291     void
 292     PB_DS_CLASS_C_DEC::
 293     swap(PB_DS_CLASS_C_DEC& other)
 294     { comb_hash_fn_base::swap(other); }
 295
 296 #undef PB_DS_CLASS_T_DEC
 297 #undef PB_DS_CLASS_C_DEC
 298
 299 #define PB_DS_CLASS_T_DEC \
 300     template<typename Key, typename Allocator, typename Comb_Hash_Fn>
 301
 302 #define PB_DS_CLASS_C_DEC \
 303     ranged_hash_fn<Key, null_hash_fn, Allocator, Comb_Hash_Fn, true>
 304
 305     /**
 306      * Specialization 4
 307      * The client does not supply a hash function (by specifying
 308      * null_hash_fn as the Hash_Fn parameter), and requests that hash
 309      * values be stored.
 310      **/
 311     template<typename Key, typename Allocator, typename Comb_Hash_Fn>
 312     class ranged_hash_fn<Key, null_hash_fn, Allocator, Comb_Hash_Fn, true>
 313     : public null_hash_fn, public Comb_Hash_Fn
 314     {
 315     protected:
 316       typedef typename Allocator::size_type size_type;
 317       typedef Comb_Hash_Fn comb_hash_fn_base;
 318
 319       ranged_hash_fn(size_type);
 320
 321       ranged_hash_fn(size_type, const Comb_Hash_Fn&);
 322
 323       ranged_hash_fn(size_type, const null_hash_fn&, const Comb_Hash_Fn&);
 324
 325       void
 326       swap(PB_DS_CLASS_C_DEC&);
 327     };
 328
 329     PB_DS_CLASS_T_DEC
 330     PB_DS_CLASS_C_DEC::
 331     ranged_hash_fn(size_type size)
 332     { Comb_Hash_Fn::notify_resized(size); }
 333
 334     PB_DS_CLASS_T_DEC
 335     PB_DS_CLASS_C_DEC::
 336     ranged_hash_fn(size_type size, const Comb_Hash_Fn& r_comb_hash_fn)
 337     : Comb_Hash_Fn(r_comb_hash_fn)
 338     { }
 339
 340     PB_DS_CLASS_T_DEC
 341     PB_DS_CLASS_C_DEC::
 342     ranged_hash_fn(size_type size, const null_hash_fn& r_null_hash_fn,
 343                    const Comb_Hash_Fn& r_comb_hash_fn)
 344     : Comb_Hash_Fn(r_comb_hash_fn)
 345     { }
 346
 347     PB_DS_CLASS_T_DEC
 348     void
 349     PB_DS_CLASS_C_DEC::
 350     swap(PB_DS_CLASS_C_DEC& other)
 351     { comb_hash_fn_base::swap(other); }
 352
 353 #undef PB_DS_CLASS_T_DEC
 354 #undef PB_DS_CLASS_C_DEC
 355
 356   } // namespace detail
 357 } // namespace __gnu_pbds
 358
 359 #endif