libstdc++
ranged_probe_fn.hpp
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1 // -*- C++ -*-
2 
3 // Copyright (C) 2005-2014 Free Software Foundation, Inc.
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16 // Under Section 7 of GPL version 3, you are granted additional
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25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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35 
36 /**
37  * @file ranged_probe_fn.hpp
38  * Contains a unified ranged probe functor, allowing the probe tables to deal with
39  * a single class for ranged probeing.
40  */
41 
42 #ifndef PB_DS_RANGED_PROBE_FN_HPP
43 #define PB_DS_RANGED_PROBE_FN_HPP
44 
45 #include <utility>
46 #include <debug/debug.h>
47 
48 namespace __gnu_pbds
49 {
50  namespace detail
51  {
52  /// Primary template.
53  template<typename Key, typename Hash_Fn, typename _Alloc,
54  typename Comb_Probe_Fn, typename Probe_Fn, bool Store_Hash>
55  class ranged_probe_fn;
56 
57 #define PB_DS_CLASS_T_DEC \
58  template<typename Key, typename Hash_Fn, typename _Alloc, \
59  typename Comb_Probe_Fn, typename Probe_Fn>
60 
61 #define PB_DS_CLASS_C_DEC \
62  ranged_probe_fn<Key, Hash_Fn, _Alloc, Comb_Probe_Fn, Probe_Fn, false>
63 
64  /**
65  * Specialization 1
66  * The client supplies a probe function and a ranged probe
67  * function, and requests that hash values not be stored.
68  **/
69  template<typename Key, typename Hash_Fn, typename _Alloc,
70  typename Comb_Probe_Fn, typename Probe_Fn>
71  class ranged_probe_fn<Key, Hash_Fn, _Alloc, Comb_Probe_Fn,
72  Probe_Fn, false>
73  : public Hash_Fn, public Comb_Probe_Fn, public Probe_Fn
74  {
75  protected:
76  typedef typename _Alloc::size_type size_type;
77  typedef Comb_Probe_Fn comb_probe_fn_base;
78  typedef Hash_Fn hash_fn_base;
79  typedef Probe_Fn probe_fn_base;
80  typedef typename _Alloc::template rebind<Key>::other key_allocator;
81  typedef typename key_allocator::const_reference key_const_reference;
82 
83  ranged_probe_fn(size_type);
84 
85  ranged_probe_fn(size_type, const Hash_Fn&);
86 
87  ranged_probe_fn(size_type, const Hash_Fn&, const Comb_Probe_Fn&);
88 
89  ranged_probe_fn(size_type, const Hash_Fn&, const Comb_Probe_Fn&,
90  const Probe_Fn&);
91 
92  void
93  swap(PB_DS_CLASS_C_DEC&);
94 
95  void
96  notify_resized(size_type);
97 
98  inline size_type
99  operator()(key_const_reference) const;
100 
101  inline size_type
102  operator()(key_const_reference, size_type, size_type) const;
103  };
104 
105  PB_DS_CLASS_T_DEC
106  PB_DS_CLASS_C_DEC::
107  ranged_probe_fn(size_type size)
108  { Comb_Probe_Fn::notify_resized(size); }
109 
110  PB_DS_CLASS_T_DEC
111  PB_DS_CLASS_C_DEC::
112  ranged_probe_fn(size_type size, const Hash_Fn& r_hash_fn)
113  : Hash_Fn(r_hash_fn)
114  { Comb_Probe_Fn::notify_resized(size); }
115 
116  PB_DS_CLASS_T_DEC
117  PB_DS_CLASS_C_DEC::
118  ranged_probe_fn(size_type size, const Hash_Fn& r_hash_fn,
119  const Comb_Probe_Fn& r_comb_probe_fn)
120  : Hash_Fn(r_hash_fn), Comb_Probe_Fn(r_comb_probe_fn)
121  { comb_probe_fn_base::notify_resized(size); }
122 
123  PB_DS_CLASS_T_DEC
124  PB_DS_CLASS_C_DEC::
125  ranged_probe_fn(size_type size, const Hash_Fn& r_hash_fn,
126  const Comb_Probe_Fn& r_comb_probe_fn,
127  const Probe_Fn& r_probe_fn)
128  : Hash_Fn(r_hash_fn), Comb_Probe_Fn(r_comb_probe_fn), Probe_Fn(r_probe_fn)
129  { comb_probe_fn_base::notify_resized(size); }
130 
131  PB_DS_CLASS_T_DEC
132  void
133  PB_DS_CLASS_C_DEC::
134  swap(PB_DS_CLASS_C_DEC& other)
135  {
136  comb_probe_fn_base::swap(other);
137  std::swap((Hash_Fn& )(*this), (Hash_Fn&)other);
138  }
139 
140  PB_DS_CLASS_T_DEC
141  void
142  PB_DS_CLASS_C_DEC::
143  notify_resized(size_type size)
144  { comb_probe_fn_base::notify_resized(size); }
145 
146  PB_DS_CLASS_T_DEC
147  inline typename PB_DS_CLASS_C_DEC::size_type
148  PB_DS_CLASS_C_DEC::
149  operator()(key_const_reference r_key) const
150  { return comb_probe_fn_base::operator()(hash_fn_base::operator()(r_key)); }
151 
152  PB_DS_CLASS_T_DEC
153  inline typename PB_DS_CLASS_C_DEC::size_type
154  PB_DS_CLASS_C_DEC::
155  operator()(key_const_reference, size_type hash, size_type i) const
156  {
157  return comb_probe_fn_base::operator()(hash + probe_fn_base::operator()(i));
158  }
159 
160 #undef PB_DS_CLASS_T_DEC
161 #undef PB_DS_CLASS_C_DEC
162 
163 #define PB_DS_CLASS_T_DEC \
164  template<typename Key, typename Hash_Fn, typename _Alloc, \
165  typename Comb_Probe_Fn, typename Probe_Fn>
166 
167 #define PB_DS_CLASS_C_DEC \
168  ranged_probe_fn<Key, Hash_Fn, _Alloc, Comb_Probe_Fn, Probe_Fn, true>
169 
170  /**
171  * Specialization 2- The client supplies a probe function and a ranged
172  * probe function, and requests that hash values not be stored.
173  **/
174  template<typename Key, typename Hash_Fn, typename _Alloc,
175  typename Comb_Probe_Fn, typename Probe_Fn>
176  class ranged_probe_fn<Key, Hash_Fn, _Alloc, Comb_Probe_Fn,
177  Probe_Fn, true>
178  : public Hash_Fn, public Comb_Probe_Fn, public Probe_Fn
179  {
180  protected:
181  typedef typename _Alloc::size_type size_type;
182  typedef std::pair<size_type, size_type> comp_hash;
183  typedef Comb_Probe_Fn comb_probe_fn_base;
184  typedef Hash_Fn hash_fn_base;
185  typedef Probe_Fn probe_fn_base;
186  typedef typename _Alloc::template rebind<Key>::other key_allocator;
187  typedef typename key_allocator::const_reference key_const_reference;
188 
189  ranged_probe_fn(size_type);
190 
191  ranged_probe_fn(size_type, const Hash_Fn&);
192 
193  ranged_probe_fn(size_type, const Hash_Fn&,
194  const Comb_Probe_Fn&);
195 
196  ranged_probe_fn(size_type, const Hash_Fn&, const Comb_Probe_Fn&,
197  const Probe_Fn&);
198 
199  void
200  swap(PB_DS_CLASS_C_DEC&);
201 
202  void
203  notify_resized(size_type);
204 
205  inline comp_hash
206  operator()(key_const_reference) const;
207 
208  inline size_type
209  operator()(key_const_reference, size_type, size_type) const;
210 
211  inline size_type
212  operator()(key_const_reference, size_type) const;
213  };
214 
215  PB_DS_CLASS_T_DEC
216  PB_DS_CLASS_C_DEC::
217  ranged_probe_fn(size_type size)
218  { Comb_Probe_Fn::notify_resized(size); }
219 
220  PB_DS_CLASS_T_DEC
221  PB_DS_CLASS_C_DEC::
222  ranged_probe_fn(size_type size, const Hash_Fn& r_hash_fn)
223  : Hash_Fn(r_hash_fn)
224  { Comb_Probe_Fn::notify_resized(size); }
225 
226  PB_DS_CLASS_T_DEC
227  PB_DS_CLASS_C_DEC::
228  ranged_probe_fn(size_type size, const Hash_Fn& r_hash_fn,
229  const Comb_Probe_Fn& r_comb_probe_fn)
230  : Hash_Fn(r_hash_fn), Comb_Probe_Fn(r_comb_probe_fn)
231  { comb_probe_fn_base::notify_resized(size); }
232 
233  PB_DS_CLASS_T_DEC
234  PB_DS_CLASS_C_DEC::
235  ranged_probe_fn(size_type size, const Hash_Fn& r_hash_fn,
236  const Comb_Probe_Fn& r_comb_probe_fn,
237  const Probe_Fn& r_probe_fn)
238  : Hash_Fn(r_hash_fn), Comb_Probe_Fn(r_comb_probe_fn), Probe_Fn(r_probe_fn)
239  { comb_probe_fn_base::notify_resized(size); }
240 
241  PB_DS_CLASS_T_DEC
242  void
243  PB_DS_CLASS_C_DEC::
244  swap(PB_DS_CLASS_C_DEC& other)
245  {
246  comb_probe_fn_base::swap(other);
247  std::swap((Hash_Fn& )(*this), (Hash_Fn& )other);
248  }
249 
250  PB_DS_CLASS_T_DEC
251  void
252  PB_DS_CLASS_C_DEC::
253  notify_resized(size_type size)
254  { comb_probe_fn_base::notify_resized(size); }
255 
256  PB_DS_CLASS_T_DEC
257  inline typename PB_DS_CLASS_C_DEC::comp_hash
258  PB_DS_CLASS_C_DEC::
259  operator()(key_const_reference r_key) const
260  {
261  const size_type hash = hash_fn_base::operator()(r_key);
262  return std::make_pair(comb_probe_fn_base::operator()(hash), hash);
263  }
264 
265  PB_DS_CLASS_T_DEC
266  inline typename PB_DS_CLASS_C_DEC::size_type
267  PB_DS_CLASS_C_DEC::
268  operator()(key_const_reference, size_type hash, size_type i) const
269  {
270  return comb_probe_fn_base::operator()(hash + probe_fn_base::operator()(i));
271  }
272 
273  PB_DS_CLASS_T_DEC
274  inline typename PB_DS_CLASS_C_DEC::size_type
275  PB_DS_CLASS_C_DEC::
276  operator()
277 #ifdef _GLIBCXX_DEBUG
278  (key_const_reference r_key, size_type hash) const
279 #else
280  (key_const_reference /*r_key*/, size_type hash) const
281 #endif
282  {
283  _GLIBCXX_DEBUG_ASSERT(hash == hash_fn_base::operator()(r_key));
284  return hash;
285  }
286 
287 #undef PB_DS_CLASS_T_DEC
288 #undef PB_DS_CLASS_C_DEC
289 
290  /**
291  * Specialization 3 and 4
292  * The client does not supply a hash function or probe function,
293  * and requests that hash values not be stored.
294  **/
295  template<typename Key, typename _Alloc, typename Comb_Probe_Fn>
296  class ranged_probe_fn<Key, null_type, _Alloc, Comb_Probe_Fn,
297  null_type, false>
298  : public Comb_Probe_Fn
299  {
300  protected:
301  typedef typename _Alloc::size_type size_type;
302  typedef Comb_Probe_Fn comb_probe_fn_base;
303  typedef typename _Alloc::template rebind<Key>::other key_allocator;
304  typedef typename key_allocator::const_reference key_const_reference;
305 
306  ranged_probe_fn(size_type size)
307  { Comb_Probe_Fn::notify_resized(size); }
308 
309  ranged_probe_fn(size_type, const Comb_Probe_Fn& r_comb_probe_fn)
310  : Comb_Probe_Fn(r_comb_probe_fn)
311  { }
312 
313  ranged_probe_fn(size_type, const null_type&,
314  const Comb_Probe_Fn& r_comb_probe_fn,
315  const null_type&)
316  : Comb_Probe_Fn(r_comb_probe_fn)
317  { }
318 
319  void
320  swap(ranged_probe_fn& other)
321  { comb_probe_fn_base::swap(other); }
322  };
323  } // namespace detail
324 } // namespace __gnu_pbds
325 
326 #endif
327 
std::make_pair
constexpr pair< typename __decay_and_strip< _T1 >::__type, typename __decay_and_strip< _T2 >::__type > make_pair(_T1 &&__x, _T2 &&__y)
A convenience wrapper for creating a pair from two objects.
Definition: stl_pair.h:276
__gnu_pbds
GNU extensions for policy-based data structures for public use.
Definition: assoc_container.hpp:51
__gnu_pbds::null_type
Represents no type, or absence of type, for template tricks.
Definition: tag_and_trait.hpp:210
std::pair
Struct holding two objects of arbitrary type.
Definition: stl_pair.h:96
std::swap
void swap(_Tp &, _Tp &) noexcept(__and_< is_nothrow_move_constructible< _Tp >, is_nothrow_move_assignable< _Tp >>::value)
Swaps two values.
Definition: move.h:166