File: concept_archetype.hpp

package info (click to toggle)
boost1.62 1.62.0+dfsg-10
  • links: PTS, VCS
  • area: main
  • in suites: sid
  • size: 687,152 kB
  • sloc: cpp: 2,613,639; xml: 972,558; ansic: 53,674; python: 32,448; sh: 9,305; asm: 3,071; cs: 2,121; makefile: 967; perl: 859; yacc: 472; php: 132; ruby: 94; f90: 55; sql: 13; csh: 6
file content (669 lines) | stat: -rw-r--r-- 23,671 bytes parent folder | download | duplicates (35)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
//
// (C) Copyright Jeremy Siek 2000.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Revision History:
//
//   17 July  2001: Added const to some member functions. (Jeremy Siek) 
//   05 May   2001: Removed static dummy_cons object. (Jeremy Siek)

// See http://www.boost.org/libs/concept_check for documentation.

#ifndef BOOST_CONCEPT_ARCHETYPES_HPP
#define BOOST_CONCEPT_ARCHETYPES_HPP

#include <boost/config.hpp>
#include <boost/iterator.hpp>
#include <boost/mpl/identity.hpp>
#include <functional>

namespace boost {

  //===========================================================================
  // Basic Archetype Classes

  namespace detail {
    class dummy_constructor { };
  }

  // A type that models no concept. The template parameter 
  // is only there so that null_archetype types can be created
  // that have different type.
  template <class T = int>
  class null_archetype {
  private:
    null_archetype() { }
    null_archetype(const null_archetype&) { }
    null_archetype& operator=(const null_archetype&) { return *this; }
  public:
    null_archetype(detail::dummy_constructor) { }
#ifndef __MWERKS__
    template <class TT>
    friend void dummy_friend(); // just to avoid warnings
#endif
  };

  // This is a helper class that provides a way to get a reference to
  // an object. The get() function will never be called at run-time
  // (nothing in this file will) so this seemingly very bad function
  // is really quite innocent. The name of this class needs to be
  // changed.
  template <class T>
  class static_object
  {
  public:
      static T& get()
      {
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
          return *reinterpret_cast<T*>(0);
#else 
          static char d[sizeof(T)];
          return *reinterpret_cast<T*>(d);
#endif 
      }
  };

  template <class Base = null_archetype<> >
  class default_constructible_archetype : public Base {
  public:
    default_constructible_archetype() 
      : Base(static_object<detail::dummy_constructor>::get()) { }
    default_constructible_archetype(detail::dummy_constructor x) : Base(x) { }
  };

  template <class Base = null_archetype<> >
  class assignable_archetype : public Base {
    assignable_archetype() { }
    assignable_archetype(const assignable_archetype&) { }
  public:
    assignable_archetype& operator=(const assignable_archetype&) {
      return *this;
    }
    assignable_archetype(detail::dummy_constructor x) : Base(x) { }
  };

  template <class Base = null_archetype<> >
  class copy_constructible_archetype : public Base {
  public:
    copy_constructible_archetype() 
      : Base(static_object<detail::dummy_constructor>::get()) { }
    copy_constructible_archetype(const copy_constructible_archetype&)
      : Base(static_object<detail::dummy_constructor>::get()) { }
    copy_constructible_archetype(detail::dummy_constructor x) : Base(x) { }
  };

  template <class Base = null_archetype<> >
  class sgi_assignable_archetype : public Base {
  public:
    sgi_assignable_archetype(const sgi_assignable_archetype&)
      : Base(static_object<detail::dummy_constructor>::get()) { }
    sgi_assignable_archetype& operator=(const sgi_assignable_archetype&) {
      return *this;
    }
    sgi_assignable_archetype(const detail::dummy_constructor& x) : Base(x) { }
  };

  struct default_archetype_base {
    default_archetype_base(detail::dummy_constructor) { }
  };

  // Careful, don't use same type for T and Base. That results in the
  // conversion operator being invalid.  Since T is often
  // null_archetype, can't use null_archetype for Base.
  template <class T, class Base = default_archetype_base>
  class convertible_to_archetype : public Base {
  private:
    convertible_to_archetype() { }
    convertible_to_archetype(const convertible_to_archetype& ) { }
    convertible_to_archetype& operator=(const convertible_to_archetype&)
      { return *this; }
  public:
    convertible_to_archetype(detail::dummy_constructor x) : Base(x) { }
    operator const T&() const { return static_object<T>::get(); }
  };

  template <class T, class Base = default_archetype_base>
  class convertible_from_archetype : public Base {
  private:
    convertible_from_archetype() { }
    convertible_from_archetype(const convertible_from_archetype& ) { }
    convertible_from_archetype& operator=(const convertible_from_archetype&)
      { return *this; }
  public:
    convertible_from_archetype(detail::dummy_constructor x) : Base(x) { }
    convertible_from_archetype(const T&) { }
    convertible_from_archetype& operator=(const T&)
      { return *this; }
  };

  class boolean_archetype {
  public:
    boolean_archetype(const boolean_archetype&) { }
    operator bool() const { return true; }
    boolean_archetype(detail::dummy_constructor) { }
  private:
    boolean_archetype() { }
    boolean_archetype& operator=(const boolean_archetype&) { return *this; }
  };
  
  template <class Base = null_archetype<> >
  class equality_comparable_archetype : public Base {
  public:
    equality_comparable_archetype(detail::dummy_constructor x) : Base(x) { }
  };
  template <class Base>
  boolean_archetype
  operator==(const equality_comparable_archetype<Base>&,
             const equality_comparable_archetype<Base>&) 
  { 
    return boolean_archetype(static_object<detail::dummy_constructor>::get());
  }
  template <class Base>
  boolean_archetype
  operator!=(const equality_comparable_archetype<Base>&,
             const equality_comparable_archetype<Base>&)
  {
    return boolean_archetype(static_object<detail::dummy_constructor>::get());
  }


  template <class Base = null_archetype<> >
  class equality_comparable2_first_archetype : public Base {
  public:
    equality_comparable2_first_archetype(detail::dummy_constructor x) 
      : Base(x) { }
  };
  template <class Base = null_archetype<> >
  class equality_comparable2_second_archetype : public Base {
  public:
    equality_comparable2_second_archetype(detail::dummy_constructor x) 
      : Base(x) { }
  };
  template <class Base1, class Base2>
  boolean_archetype
  operator==(const equality_comparable2_first_archetype<Base1>&,
             const equality_comparable2_second_archetype<Base2>&) 
  {
    return boolean_archetype(static_object<detail::dummy_constructor>::get());
  }
  template <class Base1, class Base2>
  boolean_archetype
  operator!=(const equality_comparable2_first_archetype<Base1>&,
             const equality_comparable2_second_archetype<Base2>&)
  {
    return boolean_archetype(static_object<detail::dummy_constructor>::get());
  }


  template <class Base = null_archetype<> >
  class less_than_comparable_archetype : public Base {
  public:
    less_than_comparable_archetype(detail::dummy_constructor x) : Base(x) { }
  };
  template <class Base>
  boolean_archetype
  operator<(const less_than_comparable_archetype<Base>&,
            const less_than_comparable_archetype<Base>&)
  {
    return boolean_archetype(static_object<detail::dummy_constructor>::get());
  }



  template <class Base = null_archetype<> >
  class comparable_archetype : public Base {
  public:
    comparable_archetype(detail::dummy_constructor x) : Base(x) { }
  };
  template <class Base>
  boolean_archetype
  operator<(const comparable_archetype<Base>&,
            const comparable_archetype<Base>&)
  {
    return boolean_archetype(static_object<detail::dummy_constructor>::get());
  }
  template <class Base>
  boolean_archetype
  operator<=(const comparable_archetype<Base>&,
             const comparable_archetype<Base>&)
  {
    return boolean_archetype(static_object<detail::dummy_constructor>::get());
  }
  template <class Base>
  boolean_archetype
  operator>(const comparable_archetype<Base>&,
            const comparable_archetype<Base>&)
  {
    return boolean_archetype(static_object<detail::dummy_constructor>::get());
  }
  template <class Base>
  boolean_archetype
  operator>=(const comparable_archetype<Base>&,
             const comparable_archetype<Base>&)
  {
    return boolean_archetype(static_object<detail::dummy_constructor>::get());
  }


  // The purpose of the optags is so that one can specify
  // exactly which types the operator< is defined between.
  // This is useful for allowing the operations:
  //
  // A a; B b;
  // a < b
  // b < a
  //
  // without also allowing the combinations:
  //
  // a < a
  // b < b
  //
  struct optag1 { };
  struct optag2 { };
  struct optag3 { };

#define BOOST_DEFINE_BINARY_PREDICATE_ARCHETYPE(OP, NAME)                       \
  template <class Base = null_archetype<>, class Tag = optag1 >                 \
  class NAME##_first_archetype : public Base {                                  \
  public:                                                                       \
    NAME##_first_archetype(detail::dummy_constructor x) : Base(x) { }           \
  };                                                                            \
                                                                                \
  template <class Base = null_archetype<>, class Tag = optag1 >                 \
  class NAME##_second_archetype : public Base {                                 \
  public:                                                                       \
    NAME##_second_archetype(detail::dummy_constructor x) : Base(x) { }          \
  };                                                                            \
                                                                                \
  template <class BaseFirst, class BaseSecond, class Tag>                       \
  boolean_archetype                                                             \
  operator OP (const NAME##_first_archetype<BaseFirst, Tag>&,                   \
               const NAME##_second_archetype<BaseSecond, Tag>&)                 \
  {                                                                             \
   return boolean_archetype(static_object<detail::dummy_constructor>::get());   \
  }

  BOOST_DEFINE_BINARY_PREDICATE_ARCHETYPE(==, equal_op)
  BOOST_DEFINE_BINARY_PREDICATE_ARCHETYPE(!=, not_equal_op)
  BOOST_DEFINE_BINARY_PREDICATE_ARCHETYPE(<, less_than_op)
  BOOST_DEFINE_BINARY_PREDICATE_ARCHETYPE(<=, less_equal_op)
  BOOST_DEFINE_BINARY_PREDICATE_ARCHETYPE(>, greater_than_op)
  BOOST_DEFINE_BINARY_PREDICATE_ARCHETYPE(>=, greater_equal_op)

#define BOOST_DEFINE_OPERATOR_ARCHETYPE(OP, NAME) \
  template <class Base = null_archetype<> > \
  class NAME##_archetype : public Base { \
  public: \
    NAME##_archetype(detail::dummy_constructor x) : Base(x) { } \
    NAME##_archetype(const NAME##_archetype&)  \
      : Base(static_object<detail::dummy_constructor>::get()) { } \
    NAME##_archetype& operator=(const NAME##_archetype&) { return *this; } \
  }; \
  template <class Base> \
  NAME##_archetype<Base> \
  operator OP (const NAME##_archetype<Base>&,\
               const NAME##_archetype<Base>&)  \
  { \
    return \
     NAME##_archetype<Base>(static_object<detail::dummy_constructor>::get()); \
  }

  BOOST_DEFINE_OPERATOR_ARCHETYPE(+, addable)
  BOOST_DEFINE_OPERATOR_ARCHETYPE(-, subtractable)
  BOOST_DEFINE_OPERATOR_ARCHETYPE(*, multipliable)
  BOOST_DEFINE_OPERATOR_ARCHETYPE(/, dividable)
  BOOST_DEFINE_OPERATOR_ARCHETYPE(%, modable)

  // As is, these are useless because of the return type.
  // Need to invent a better way...
#define BOOST_DEFINE_BINARY_OPERATOR_ARCHETYPE(OP, NAME) \
  template <class Return, class Base = null_archetype<> > \
  class NAME##_first_archetype : public Base { \
  public: \
    NAME##_first_archetype(detail::dummy_constructor x) : Base(x) { } \
  }; \
  \
  template <class Return, class Base = null_archetype<> > \
  class NAME##_second_archetype : public Base { \
  public: \
    NAME##_second_archetype(detail::dummy_constructor x) : Base(x) { } \
  }; \
  \
  template <class Return, class BaseFirst, class BaseSecond> \
  Return \
  operator OP (const NAME##_first_archetype<Return, BaseFirst>&, \
               const NAME##_second_archetype<Return, BaseSecond>&) \
  { \
    return Return(static_object<detail::dummy_constructor>::get()); \
  }

  BOOST_DEFINE_BINARY_OPERATOR_ARCHETYPE(+, plus_op)
  BOOST_DEFINE_BINARY_OPERATOR_ARCHETYPE(*, time_op)
  BOOST_DEFINE_BINARY_OPERATOR_ARCHETYPE(/, divide_op)
  BOOST_DEFINE_BINARY_OPERATOR_ARCHETYPE(-, subtract_op)
  BOOST_DEFINE_BINARY_OPERATOR_ARCHETYPE(%, mod_op)

  //===========================================================================
  // Function Object Archetype Classes

  template <class Return>
  class generator_archetype {
  public:
    const Return& operator()() {
      return static_object<Return>::get(); 
    }
  };

  class void_generator_archetype {
  public:
    void operator()() { }
  };

  template <class Arg, class Return>
  class unary_function_archetype {
  private:
    unary_function_archetype() { }
  public:
    unary_function_archetype(detail::dummy_constructor) { }
    const Return& operator()(const Arg&) const {
      return static_object<Return>::get(); 
    }
  };

  template <class Arg1, class Arg2, class Return>
  class binary_function_archetype {
  private:
    binary_function_archetype() { }
  public:
    binary_function_archetype(detail::dummy_constructor) { }
    const Return& operator()(const Arg1&, const Arg2&) const {
      return static_object<Return>::get(); 
    }
  };

  template <class Arg>
  class unary_predicate_archetype {
    typedef boolean_archetype Return;
    unary_predicate_archetype() { }
  public:
    unary_predicate_archetype(detail::dummy_constructor) { }
    const Return& operator()(const Arg&) const {
      return static_object<Return>::get(); 
    }
  };

  template <class Arg1, class Arg2, class Base = null_archetype<> >
  class binary_predicate_archetype {
    typedef boolean_archetype Return;
    binary_predicate_archetype() { }
  public:
    binary_predicate_archetype(detail::dummy_constructor) { }
    const Return& operator()(const Arg1&, const Arg2&) const {
      return static_object<Return>::get(); 
    }
  };

  //===========================================================================
  // Iterator Archetype Classes

  template <class T, int I = 0>
  class input_iterator_archetype
  {
  private:
    typedef input_iterator_archetype self;
  public:
    typedef std::input_iterator_tag iterator_category;
    typedef T value_type;
    struct reference {
      operator const value_type&() const { return static_object<T>::get(); }
    };
    typedef const T* pointer;
    typedef std::ptrdiff_t difference_type;
    self& operator=(const self&) { return *this;  }
    bool operator==(const self&) const { return true; }
    bool operator!=(const self&) const { return true; }
    reference operator*() const { return reference(); }
    self& operator++() { return *this; }
    self operator++(int) { return *this; }
  };

  template <class T>
  class input_iterator_archetype_no_proxy
  {
  private:
    typedef input_iterator_archetype_no_proxy self;
  public:
    typedef std::input_iterator_tag iterator_category;
    typedef T value_type;
    typedef const T& reference;
    typedef const T* pointer;
    typedef std::ptrdiff_t difference_type;
    self& operator=(const self&) { return *this;  }
    bool operator==(const self&) const { return true; }
    bool operator!=(const self&) const { return true; }
    reference operator*() const { return static_object<T>::get(); }
    self& operator++() { return *this; }
    self operator++(int) { return *this; }
  };

  template <class T>
  struct output_proxy {
    output_proxy& operator=(const T&) { return *this; }
  };

  template <class T>
  class output_iterator_archetype
  {
  public:
    typedef output_iterator_archetype self;
  public:
    typedef std::output_iterator_tag iterator_category;
    typedef output_proxy<T> value_type;
    typedef output_proxy<T> reference;
    typedef void pointer;
    typedef void difference_type;
    output_iterator_archetype(detail::dummy_constructor) { }
    output_iterator_archetype(const self&) { }
    self& operator=(const self&) { return *this; }
    bool operator==(const self&) const { return true; }
    bool operator!=(const self&) const { return true; }
    reference operator*() const { return output_proxy<T>(); }
    self& operator++() { return *this; }
    self operator++(int) { return *this; }
  private:
    output_iterator_archetype() { }
  };

  template <class T>
  class input_output_iterator_archetype
  {
  private:
    typedef input_output_iterator_archetype self;
    struct in_out_tag : public std::input_iterator_tag, public std::output_iterator_tag { };
  public:
    typedef in_out_tag iterator_category;
    typedef T value_type;
    struct reference {
      reference& operator=(const T&) { return *this; }
      operator value_type() { return static_object<T>::get(); }
    };
    typedef const T* pointer;
    typedef std::ptrdiff_t difference_type;
    input_output_iterator_archetype() { }
    self& operator=(const self&) { return *this;  }
    bool operator==(const self&) const { return true; }
    bool operator!=(const self&) const { return true; }
    reference operator*() const { return reference(); }
    self& operator++() { return *this; }
    self operator++(int) { return *this; }
  };

  template <class T>
  class forward_iterator_archetype
  {
  public:
    typedef forward_iterator_archetype self;
  public:
    typedef std::forward_iterator_tag iterator_category;
    typedef T value_type;
    typedef const T& reference;
    typedef T const* pointer;
    typedef std::ptrdiff_t difference_type;
    forward_iterator_archetype() { }
    self& operator=(const self&) { return *this;  }
    bool operator==(const self&) const { return true; }
    bool operator!=(const self&) const { return true; }
    reference operator*() const { return static_object<T>::get(); }
    self& operator++() { return *this; }
    self operator++(int) { return *this; }
  };

  template <class T>
  class mutable_forward_iterator_archetype
  {
  public:
    typedef mutable_forward_iterator_archetype self;
  public:
    typedef std::forward_iterator_tag iterator_category;
    typedef T value_type;
    typedef T& reference;
    typedef T* pointer;
    typedef std::ptrdiff_t difference_type;
    mutable_forward_iterator_archetype() { }
    self& operator=(const self&) { return *this;  }
    bool operator==(const self&) const { return true; }
    bool operator!=(const self&) const { return true; }
    reference operator*() const { return static_object<T>::get(); }
    self& operator++() { return *this; }
    self operator++(int) { return *this; }
  };

  template <class T>
  class bidirectional_iterator_archetype
  {
  public:
    typedef bidirectional_iterator_archetype self;
  public:
    typedef std::bidirectional_iterator_tag iterator_category;
    typedef T value_type;
    typedef const T& reference;
    typedef T* pointer;
    typedef std::ptrdiff_t difference_type;
    bidirectional_iterator_archetype() { }
    self& operator=(const self&) { return *this;  }
    bool operator==(const self&) const { return true; }
    bool operator!=(const self&) const { return true; }
    reference operator*() const { return static_object<T>::get(); }
    self& operator++() { return *this; }
    self operator++(int) { return *this; }
    self& operator--() { return *this; }
    self operator--(int) { return *this; }
  };

  template <class T>
  class mutable_bidirectional_iterator_archetype
  {
  public:
    typedef mutable_bidirectional_iterator_archetype self;
  public:
    typedef std::bidirectional_iterator_tag iterator_category;
    typedef T value_type;
    typedef T& reference;
    typedef T* pointer;
    typedef std::ptrdiff_t difference_type;
    mutable_bidirectional_iterator_archetype() { }
    self& operator=(const self&) { return *this;  }
    bool operator==(const self&) const { return true; }
    bool operator!=(const self&) const { return true; }
    reference operator*() const { return static_object<T>::get(); }
    self& operator++() { return *this; }
    self operator++(int) { return *this; }
    self& operator--() { return *this; }
    self operator--(int) { return *this; }
  };

  template <class T>
  class random_access_iterator_archetype
  {
  public:
    typedef random_access_iterator_archetype self;
  public:
    typedef std::random_access_iterator_tag iterator_category;
    typedef T value_type;
    typedef const T& reference;
    typedef T* pointer;
    typedef std::ptrdiff_t difference_type;
    random_access_iterator_archetype() { }
    self& operator=(const self&) { return *this;  }
    bool operator==(const self&) const { return true; }
    bool operator!=(const self&) const { return true; }
    reference operator*() const { return static_object<T>::get(); }
    self& operator++() { return *this; }
    self operator++(int) { return *this; }
    self& operator--() { return *this; }
    self operator--(int) { return *this; }
    reference operator[](difference_type) const
      { return static_object<T>::get(); }
    self& operator+=(difference_type) { return *this; }
    self& operator-=(difference_type) { return *this; }
    difference_type operator-(const self&) const
      { return difference_type(); }
    self operator+(difference_type) const { return *this; }
    self operator-(difference_type) const { return *this; }
    bool operator<(const self&) const { return true; }
    bool operator<=(const self&) const { return true; }
    bool operator>(const self&) const { return true; }
    bool operator>=(const self&) const { return true; }
  };
  template <class T>
  random_access_iterator_archetype<T> 
  operator+(typename random_access_iterator_archetype<T>::difference_type, 
            const random_access_iterator_archetype<T>& x) 
    { return x; }


  template <class T>
  class mutable_random_access_iterator_archetype
  {
  public:
    typedef mutable_random_access_iterator_archetype self;
  public:
    typedef std::random_access_iterator_tag iterator_category;
    typedef T value_type;
    typedef T& reference;
    typedef T* pointer;
    typedef std::ptrdiff_t difference_type;
    mutable_random_access_iterator_archetype() { }
    self& operator=(const self&) { return *this;  }
    bool operator==(const self&) const { return true; }
    bool operator!=(const self&) const { return true; }
    reference operator*() const { return static_object<T>::get(); }
    self& operator++() { return *this; }
    self operator++(int) { return *this; }
    self& operator--() { return *this; }
    self operator--(int) { return *this; }
    reference operator[](difference_type) const
      { return static_object<T>::get(); }
    self& operator+=(difference_type) { return *this; }
    self& operator-=(difference_type) { return *this; }
    difference_type operator-(const self&) const
      { return difference_type(); }
    self operator+(difference_type) const { return *this; }
    self operator-(difference_type) const { return *this; }
    bool operator<(const self&) const { return true; }
    bool operator<=(const self&) const { return true; }
    bool operator>(const self&) const { return true; }
    bool operator>=(const self&) const { return true; }
  };
  template <class T>
  mutable_random_access_iterator_archetype<T> 
  operator+
    (typename mutable_random_access_iterator_archetype<T>::difference_type, 
     const mutable_random_access_iterator_archetype<T>& x) 
    { return x; }

} // namespace boost

#endif // BOOST_CONCEPT_ARCHETYPES_H