1// Boost.Range library
2//
3// Copyright Neil Groves 2010. Use, modification and
4// distribution is subject to the Boost Software License, Version
5// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
6// http://www.boost.org/LICENSE_1_0.txt)
7//
8// For more information, see http://www.boost.org/libs/range/
9//
10#ifndef BOOST_RANGE_DETAIL_ANY_ITERATOR_WRAPPER_HPP_INCLUDED
11#define BOOST_RANGE_DETAIL_ANY_ITERATOR_WRAPPER_HPP_INCLUDED
12
13#include <boost/polymorphic_cast.hpp>
14#include <boost/range/config.hpp>
15#include <boost/range/detail/any_iterator_interface.hpp>
16#include <boost/range/concepts.hpp>
17
18namespace boost
19{
20 namespace range_detail
21 {
22 template<typename TargetT, typename SourceT>
23 TargetT& polymorphic_ref_downcast(SourceT& source)
24 {
25#ifdef BOOST_NO_RTTI
26 return static_cast<TargetT&>(source);
27#else
28 return *boost::polymorphic_downcast<TargetT*>(&source);
29#endif
30 }
31
32 template<class Reference, class T>
33 Reference dereference_cast(T& x)
34 {
35 return static_cast<Reference>(x);
36 }
37 template<class Reference, class T>
38 Reference dereference_cast(const T& x)
39 {
40 return static_cast<Reference>(const_cast<T&>(x));
41 }
42
43 template<
44 class WrappedIterator
45 , class Reference
46 , class Buffer
47 >
48 class any_incrementable_iterator_wrapper
49 : public any_incrementable_iterator_interface<
50 Reference
51 , Buffer
52 >
53 {
54 BOOST_RANGE_CONCEPT_ASSERT(( IncrementableIteratorConcept<WrappedIterator> ));
55 public:
56 typedef WrappedIterator wrapped_type;
57
58 BOOST_STATIC_ASSERT(( is_convertible<
59 typename iterator_reference<WrappedIterator>::type
60 , Reference
61 >::value ));
62
63 any_incrementable_iterator_wrapper()
64 : m_it()
65 {}
66
67 explicit any_incrementable_iterator_wrapper(wrapped_type it)
68 : m_it(it)
69 {}
70
71 // any_incrementable_iterator implementation
72 virtual any_incrementable_iterator_wrapper* clone(
73 typename any_incrementable_iterator_wrapper::buffer_type& buffer
74 ) const
75 {
76 return new (buffer.allocate(sizeof(*this)))
77 any_incrementable_iterator_wrapper(m_it);
78 }
79
80 virtual any_incrementable_iterator_wrapper<
81 WrappedIterator
82 , typename any_incrementable_iterator_wrapper::const_reference
83 , Buffer
84 >* clone_const_ref(
85 typename any_incrementable_iterator_wrapper::buffer_type& buffer
86 ) const
87 {
88 typedef any_incrementable_iterator_wrapper<
89 WrappedIterator
90 , typename any_incrementable_iterator_wrapper::const_reference
91 , Buffer
92 > result_type;
93
94 return new (buffer.allocate(sizeof(result_type)))
95 result_type(m_it);
96 }
97
98 virtual any_incrementable_iterator_wrapper<
99 WrappedIterator
100 , typename any_incrementable_iterator_wrapper::reference_as_value_type
101 , Buffer
102 >* clone_reference_as_value(
103 typename any_incrementable_iterator_wrapper::buffer_type& buffer
104 ) const
105 {
106 typedef any_incrementable_iterator_wrapper<
107 WrappedIterator
108 , typename any_incrementable_iterator_wrapper::reference_as_value_type
109 , Buffer
110 > result_type;
111
112 return new (buffer.allocate(sizeof(result_type)))
113 result_type(m_it);
114 }
115
116 virtual void increment()
117 {
118 ++m_it;
119 }
120
121 private:
122 wrapped_type m_it;
123 };
124
125 template<
126 class WrappedIterator
127 , class Reference
128 , class Buffer
129 >
130 class any_single_pass_iterator_wrapper
131 : public any_single_pass_iterator_interface<
132 Reference
133 , Buffer
134 >
135 {
136 struct disabler {};
137 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassIteratorConcept<WrappedIterator> ));
138 typedef any_single_pass_iterator_interface<
139 Reference,
140 Buffer
141 > base_type;
142
143 public:
144 typedef typename base_type::reference reference;
145
146 any_single_pass_iterator_wrapper()
147 : m_it()
148 {}
149
150 explicit any_single_pass_iterator_wrapper(const WrappedIterator& it)
151 : m_it(it)
152 {}
153 // any_single_pass_iterator_interface<Reference> implementation
154 virtual any_single_pass_iterator_wrapper* clone(
155 typename any_single_pass_iterator_wrapper::buffer_type& buffer
156 ) const
157 {
158 return new (buffer.allocate(sizeof(*this)))
159 any_single_pass_iterator_wrapper(m_it);
160 }
161
162 virtual any_single_pass_iterator_wrapper<
163 WrappedIterator
164 , typename any_single_pass_iterator_wrapper::const_reference
165 , Buffer
166 >* clone_const_ref(
167 typename any_single_pass_iterator_wrapper::buffer_type& buffer
168 ) const
169 {
170 typedef any_single_pass_iterator_wrapper<
171 WrappedIterator
172 , typename any_single_pass_iterator_wrapper::const_reference
173 , Buffer
174 > result_type;
175
176 return new (buffer.allocate(sizeof(result_type)))
177 result_type(m_it);
178 }
179
180 virtual any_single_pass_iterator_wrapper<
181 WrappedIterator
182 , typename any_single_pass_iterator_wrapper::reference_as_value_type
183 , Buffer
184 >* clone_reference_as_value(
185 typename any_single_pass_iterator_wrapper::buffer_type& buffer
186 ) const
187 {
188 typedef any_single_pass_iterator_wrapper<
189 WrappedIterator
190 , typename any_single_pass_iterator_wrapper::reference_as_value_type
191 , Buffer
192 > result_type;
193
194 return new (buffer.allocate(sizeof(result_type)))
195 result_type(m_it);
196 }
197
198 virtual void increment()
199 {
200 ++m_it;
201 }
202
203 virtual bool equal(const any_single_pass_iterator_interface<Reference, Buffer>& other) const
204 {
205 return m_it == range_detail::polymorphic_ref_downcast<const any_single_pass_iterator_wrapper>(other).m_it;
206 }
207
208 virtual reference dereference() const
209 {
210 return dereference_cast<reference>(*m_it);
211 }
212
213 private:
214 WrappedIterator m_it;
215 };
216
217 template<
218 class WrappedIterator
219 , class Reference
220 , class Buffer
221 >
222 class any_forward_iterator_wrapper
223 : public any_forward_iterator_interface<
224 Reference
225 , Buffer
226 >
227 {
228 BOOST_RANGE_CONCEPT_ASSERT(( ForwardIteratorConcept<WrappedIterator> ));
229 typedef any_forward_iterator_interface<
230 Reference,
231 Buffer
232 > base_type;
233
234 public:
235 typedef typename base_type::reference reference;
236
237 any_forward_iterator_wrapper()
238 : m_it()
239 {}
240
241 explicit any_forward_iterator_wrapper(const WrappedIterator& it)
242 : m_it(it)
243 {}
244
245 // any_forward_iterator_interface<Reference> implementation
246 virtual any_forward_iterator_wrapper* clone(
247 typename any_forward_iterator_wrapper::buffer_type& buffer
248 ) const
249 {
250 return new (buffer.allocate(sizeof(*this)))
251 any_forward_iterator_wrapper(m_it);
252 }
253
254 virtual any_forward_iterator_wrapper<
255 WrappedIterator
256 , typename any_forward_iterator_wrapper::const_reference
257 , Buffer
258 >* clone_const_ref(
259 typename any_forward_iterator_wrapper::buffer_type& buffer
260 ) const
261 {
262 typedef any_forward_iterator_wrapper<
263 WrappedIterator
264 , typename any_forward_iterator_wrapper::const_reference
265 , Buffer
266 > result_type;
267
268 return new (buffer.allocate(sizeof(result_type)))
269 result_type(m_it);
270 }
271
272 virtual any_forward_iterator_wrapper<
273 WrappedIterator
274 , typename any_forward_iterator_wrapper::reference_as_value_type
275 , Buffer
276 >* clone_reference_as_value(
277 typename any_forward_iterator_wrapper::buffer_type& buffer
278 ) const
279 {
280 typedef any_forward_iterator_wrapper<
281 WrappedIterator
282 , typename any_forward_iterator_wrapper::reference_as_value_type
283 , Buffer
284 > result_type;
285
286 return new (buffer.allocate(sizeof(result_type)))
287 result_type(m_it);
288 }
289
290 virtual void increment()
291 {
292 ++m_it;
293 }
294
295 virtual bool equal(const any_single_pass_iterator_interface<Reference, Buffer>& other) const
296 {
297 return m_it == range_detail::polymorphic_ref_downcast<const any_forward_iterator_wrapper>(other).m_it;
298 }
299
300 virtual reference dereference() const
301 {
302 return dereference_cast<reference>(*m_it);
303 }
304 private:
305 WrappedIterator m_it;
306 };
307
308 template<
309 class WrappedIterator
310 , class Reference
311 , class Buffer
312 >
313 class any_bidirectional_iterator_wrapper
314 : public any_bidirectional_iterator_interface<
315 Reference
316 , Buffer
317 >
318 {
319 BOOST_RANGE_CONCEPT_ASSERT(( BidirectionalIteratorConcept<WrappedIterator> ));
320 typedef any_bidirectional_iterator_interface<
321 Reference,
322 Buffer
323 > base_type;
324
325 public:
326 typedef typename base_type::reference reference;
327
328 any_bidirectional_iterator_wrapper()
329 : m_it()
330 {
331 }
332
333 explicit any_bidirectional_iterator_wrapper(const WrappedIterator& it)
334 : m_it(it)
335 {
336 }
337
338 virtual any_bidirectional_iterator_wrapper* clone(
339 typename any_bidirectional_iterator_wrapper::buffer_type& buffer
340 ) const
341 {
342 return new (buffer.allocate(sizeof(*this)))
343 any_bidirectional_iterator_wrapper(*this);
344 }
345
346 virtual any_bidirectional_iterator_wrapper<
347 WrappedIterator
348 , typename any_bidirectional_iterator_wrapper::const_reference
349 , Buffer
350 >* clone_const_ref(
351 typename any_bidirectional_iterator_wrapper::buffer_type& buffer
352 ) const
353 {
354 typedef any_bidirectional_iterator_wrapper<
355 WrappedIterator
356 , typename any_bidirectional_iterator_wrapper::const_reference
357 , Buffer
358 > result_type;
359
360 return new (buffer.allocate(sizeof(result_type)))
361 result_type(m_it);
362 }
363
364 virtual any_bidirectional_iterator_wrapper<
365 WrappedIterator
366 , typename any_bidirectional_iterator_wrapper::reference_as_value_type
367 , Buffer
368 >* clone_reference_as_value(
369 typename any_bidirectional_iterator_wrapper::buffer_type& buffer
370 ) const
371 {
372 typedef any_bidirectional_iterator_wrapper<
373 WrappedIterator
374 , typename any_bidirectional_iterator_wrapper::reference_as_value_type
375 , Buffer
376 > result_type;
377
378 return new (buffer.allocate(sizeof(result_type)))
379 result_type(m_it);
380 }
381
382 virtual void increment()
383 {
384 ++m_it;
385 }
386
387 virtual void decrement()
388 {
389 --m_it;
390 }
391
392 virtual bool equal(const any_single_pass_iterator_interface<Reference, Buffer>& other) const
393 {
394 return m_it == range_detail::polymorphic_ref_downcast<const any_bidirectional_iterator_wrapper>(other).m_it;
395 }
396
397 virtual reference dereference() const
398 {
399 return dereference_cast<reference>(*m_it);
400 }
401
402 private:
403 WrappedIterator m_it;
404 };
405
406 template<
407 class WrappedIterator
408 , class Reference
409 , class Difference
410 , class Buffer
411 >
412 class any_random_access_iterator_wrapper
413 : public any_random_access_iterator_interface<
414 Reference
415 , Difference
416 , Buffer
417 >
418 {
419 BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessIteratorConcept<WrappedIterator> ));
420 typedef any_random_access_iterator_interface<
421 Reference,
422 Difference,
423 Buffer
424 > base_type;
425
426 public:
427 typedef typename base_type::reference reference;
428 typedef Difference difference_type;
429
430 any_random_access_iterator_wrapper()
431 : m_it()
432 {
433 }
434
435 explicit any_random_access_iterator_wrapper(const WrappedIterator& other)
436 : m_it(other)
437 {
438 }
439
440 virtual any_random_access_iterator_wrapper* clone(
441 typename any_random_access_iterator_wrapper::buffer_type& buffer
442 ) const
443 {
444 return new (buffer.allocate(sizeof(*this)))
445 any_random_access_iterator_wrapper(*this);
446 }
447
448 virtual any_random_access_iterator_wrapper<
449 WrappedIterator
450 , typename any_random_access_iterator_wrapper::const_reference
451 , Difference
452 , Buffer
453 >* clone_const_ref(
454 typename any_random_access_iterator_wrapper::buffer_type& buffer
455 ) const
456 {
457 typedef any_random_access_iterator_wrapper<
458 WrappedIterator
459 , typename any_random_access_iterator_wrapper::const_reference
460 , Difference
461 , Buffer
462 > result_type;
463
464 return new (buffer.allocate(sizeof(result_type)))
465 result_type(m_it);
466 }
467
468 virtual any_random_access_iterator_wrapper<
469 WrappedIterator
470 , typename any_random_access_iterator_wrapper::reference_as_value_type
471 , Difference
472 , Buffer
473 >* clone_reference_as_value(
474 typename any_random_access_iterator_wrapper::buffer_type& buffer
475 ) const
476 {
477 typedef any_random_access_iterator_wrapper<
478 WrappedIterator
479 , typename any_random_access_iterator_wrapper::reference_as_value_type
480 , Difference
481 , Buffer
482 > result_type;
483
484 return new (buffer.allocate(sizeof(result_type)))
485 result_type(m_it);
486 }
487
488 virtual void increment()
489 {
490 ++m_it;
491 }
492
493 virtual bool equal(const any_single_pass_iterator_interface<Reference, Buffer>& other) const
494 {
495 return m_it == range_detail::polymorphic_ref_downcast<const any_random_access_iterator_wrapper>(other).m_it;
496 }
497
498 virtual void decrement()
499 {
500 --m_it;
501 }
502
503 virtual void advance(Difference offset)
504 {
505 m_it += offset;
506 }
507
508 virtual reference dereference() const
509 {
510 return dereference_cast<reference>(*m_it);
511 }
512
513 virtual Difference distance_to(const any_random_access_iterator_interface<Reference, Difference, Buffer>& other) const
514 {
515 return range_detail::polymorphic_ref_downcast<const any_random_access_iterator_wrapper>(other).m_it - m_it;
516 }
517
518 private:
519 WrappedIterator m_it;
520 };
521
522 template<
523 class WrappedIterator
524 , class Traversal
525 , class Reference
526 , class Difference
527 , class Buffer
528 >
529 struct any_iterator_wrapper_type_generator;
530
531 template<
532 class WrappedIterator
533 , class Reference
534 , class Difference
535 , class Buffer
536 >
537 struct any_iterator_wrapper_type_generator<
538 WrappedIterator
539 , incrementable_traversal_tag
540 , Reference
541 , Difference
542 , Buffer
543 >
544 {
545 typedef any_incrementable_iterator_wrapper<
546 WrappedIterator
547 , Reference
548 , Buffer
549 > type;
550 };
551
552 template<
553 class WrappedIterator
554 , class Reference
555 , class Difference
556 , class Buffer
557 >
558 struct any_iterator_wrapper_type_generator<
559 WrappedIterator
560 , single_pass_traversal_tag
561 , Reference
562 , Difference
563 , Buffer
564 >
565 {
566 typedef any_single_pass_iterator_wrapper<
567 WrappedIterator
568 , Reference
569 , Buffer
570 > type;
571 };
572
573 template<
574 class WrappedIterator
575 , class Reference
576 , class Difference
577 , class Buffer
578 >
579 struct any_iterator_wrapper_type_generator<
580 WrappedIterator
581 , forward_traversal_tag
582 , Reference
583 , Difference
584 , Buffer
585 >
586 {
587 typedef any_forward_iterator_wrapper<
588 WrappedIterator
589 , Reference
590 , Buffer
591 > type;
592 };
593
594 template<
595 class WrappedIterator
596 , class Reference
597 , class Difference
598 , class Buffer
599 >
600 struct any_iterator_wrapper_type_generator<
601 WrappedIterator
602 , bidirectional_traversal_tag
603 , Reference
604 , Difference
605 , Buffer
606 >
607 {
608 typedef any_bidirectional_iterator_wrapper<
609 WrappedIterator
610 , Reference
611 , Buffer
612 > type;
613 };
614
615 template<
616 class WrappedIterator
617 , class Reference
618 , class Difference
619 , class Buffer
620 >
621 struct any_iterator_wrapper_type_generator<
622 WrappedIterator
623 , random_access_traversal_tag
624 , Reference
625 , Difference
626 , Buffer
627 >
628 {
629 typedef any_random_access_iterator_wrapper<
630 WrappedIterator
631 , Reference
632 , Difference
633 , Buffer
634 > type;
635 };
636
637 } // namespace range_detail
638} // namespace boost
639
640#endif // include guard
641

source code of boost/libs/range/include/boost/range/detail/any_iterator_wrapper.hpp