libstdc++
boost_concept_check.h
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1 // -*- C++ -*-
2 
3 // Copyright (C) 2004-2017 Free Software Foundation, Inc.
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25 // (C) Copyright Jeremy Siek 2000. Permission to copy, use, modify,
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31 
32 /** @file bits/boost_concept_check.h
33  * This is an internal header file, included by other library headers.
34  * Do not attempt to use it directly. @headername{iterator}
35  */
36 
37 // GCC Note: based on version 1.12.0 of the Boost library.
38 
39 #ifndef _BOOST_CONCEPT_CHECK_H
40 #define _BOOST_CONCEPT_CHECK_H 1
41 
42 #pragma GCC system_header
43 
44 #include <bits/c++config.h>
45 #include <bits/stl_iterator_base_types.h> // for traits and tags
46 
47 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
48 {
49 _GLIBCXX_BEGIN_NAMESPACE_VERSION
50 
51 #define _IsUnused __attribute__ ((__unused__))
52 
53 // When the C-C code is in use, we would like this function to do as little
54 // as possible at runtime, use as few resources as possible, and hopefully
55 // be elided out of existence... hmmm.
56 template <class _Concept>
57 inline void __function_requires()
58 {
59  void (_Concept::*__x)() _IsUnused = &_Concept::__constraints;
60 }
61 
62 // No definition: if this is referenced, there's a problem with
63 // the instantiating type not being one of the required integer types.
64 // Unfortunately, this results in a link-time error, not a compile-time error.
65 void __error_type_must_be_an_integer_type();
66 void __error_type_must_be_an_unsigned_integer_type();
67 void __error_type_must_be_a_signed_integer_type();
68 
69 // ??? Should the "concept_checking*" structs begin with more than _ ?
70 #define _GLIBCXX_CLASS_REQUIRES(_type_var, _ns, _concept) \
71  typedef void (_ns::_concept <_type_var>::* _func##_type_var##_concept)(); \
72  template <_func##_type_var##_concept _Tp1> \
73  struct _concept_checking##_type_var##_concept { }; \
74  typedef _concept_checking##_type_var##_concept< \
75  &_ns::_concept <_type_var>::__constraints> \
76  _concept_checking_typedef##_type_var##_concept
77 
78 #define _GLIBCXX_CLASS_REQUIRES2(_type_var1, _type_var2, _ns, _concept) \
79  typedef void (_ns::_concept <_type_var1,_type_var2>::* _func##_type_var1##_type_var2##_concept)(); \
80  template <_func##_type_var1##_type_var2##_concept _Tp1> \
81  struct _concept_checking##_type_var1##_type_var2##_concept { }; \
82  typedef _concept_checking##_type_var1##_type_var2##_concept< \
83  &_ns::_concept <_type_var1,_type_var2>::__constraints> \
84  _concept_checking_typedef##_type_var1##_type_var2##_concept
85 
86 #define _GLIBCXX_CLASS_REQUIRES3(_type_var1, _type_var2, _type_var3, _ns, _concept) \
87  typedef void (_ns::_concept <_type_var1,_type_var2,_type_var3>::* _func##_type_var1##_type_var2##_type_var3##_concept)(); \
88  template <_func##_type_var1##_type_var2##_type_var3##_concept _Tp1> \
89  struct _concept_checking##_type_var1##_type_var2##_type_var3##_concept { }; \
90  typedef _concept_checking##_type_var1##_type_var2##_type_var3##_concept< \
91  &_ns::_concept <_type_var1,_type_var2,_type_var3>::__constraints> \
92  _concept_checking_typedef##_type_var1##_type_var2##_type_var3##_concept
93 
94 #define _GLIBCXX_CLASS_REQUIRES4(_type_var1, _type_var2, _type_var3, _type_var4, _ns, _concept) \
95  typedef void (_ns::_concept <_type_var1,_type_var2,_type_var3,_type_var4>::* _func##_type_var1##_type_var2##_type_var3##_type_var4##_concept)(); \
96  template <_func##_type_var1##_type_var2##_type_var3##_type_var4##_concept _Tp1> \
97  struct _concept_checking##_type_var1##_type_var2##_type_var3##_type_var4##_concept { }; \
98  typedef _concept_checking##_type_var1##_type_var2##_type_var3##_type_var4##_concept< \
99  &_ns::_concept <_type_var1,_type_var2,_type_var3,_type_var4>::__constraints> \
100  _concept_checking_typedef##_type_var1##_type_var2##_type_var3##_type_var4##_concept
101 
102 
103 template <class _Tp1, class _Tp2>
104 struct _Aux_require_same { };
105 
106 template <class _Tp>
107 struct _Aux_require_same<_Tp,_Tp> { typedef _Tp _Type; };
108 
109  template <class _Tp1, class _Tp2>
110  struct _SameTypeConcept
111  {
112  void __constraints() {
113  typedef typename _Aux_require_same<_Tp1, _Tp2>::_Type _Required;
114  }
115  };
116 
117  template <class _Tp>
118  struct _IntegerConcept {
119  void __constraints() {
120  __error_type_must_be_an_integer_type();
121  }
122  };
123  template <> struct _IntegerConcept<short> { void __constraints() {} };
124  template <> struct _IntegerConcept<unsigned short> { void __constraints(){} };
125  template <> struct _IntegerConcept<int> { void __constraints() {} };
126  template <> struct _IntegerConcept<unsigned int> { void __constraints() {} };
127  template <> struct _IntegerConcept<long> { void __constraints() {} };
128  template <> struct _IntegerConcept<unsigned long> { void __constraints() {} };
129  template <> struct _IntegerConcept<long long> { void __constraints() {} };
130  template <> struct _IntegerConcept<unsigned long long>
131  { void __constraints() {} };
132 
133  template <class _Tp>
134  struct _SignedIntegerConcept {
135  void __constraints() {
136  __error_type_must_be_a_signed_integer_type();
137  }
138  };
139  template <> struct _SignedIntegerConcept<short> { void __constraints() {} };
140  template <> struct _SignedIntegerConcept<int> { void __constraints() {} };
141  template <> struct _SignedIntegerConcept<long> { void __constraints() {} };
142  template <> struct _SignedIntegerConcept<long long> { void __constraints(){}};
143 
144  template <class _Tp>
145  struct _UnsignedIntegerConcept {
146  void __constraints() {
147  __error_type_must_be_an_unsigned_integer_type();
148  }
149  };
150  template <> struct _UnsignedIntegerConcept<unsigned short>
151  { void __constraints() {} };
152  template <> struct _UnsignedIntegerConcept<unsigned int>
153  { void __constraints() {} };
154  template <> struct _UnsignedIntegerConcept<unsigned long>
155  { void __constraints() {} };
156  template <> struct _UnsignedIntegerConcept<unsigned long long>
157  { void __constraints() {} };
158 
159  //===========================================================================
160  // Basic Concepts
161 
162  template <class _Tp>
163  struct _DefaultConstructibleConcept
164  {
165  void __constraints() {
166  _Tp __a _IsUnused; // require default constructor
167  }
168  };
169 
170  template <class _Tp>
171  struct _AssignableConcept
172  {
173  void __constraints() {
174  __a = __a; // require assignment operator
175  __const_constraints(__a);
176  }
177  void __const_constraints(const _Tp& __b) {
178  __a = __b; // const required for argument to assignment
179  }
180  _Tp __a;
181  // possibly should be "Tp* a;" and then dereference "a" in constraint
182  // functions? present way would require a default ctor, i think...
183  };
184 
185  template <class _Tp>
186  struct _CopyConstructibleConcept
187  {
188  void __constraints() {
189  _Tp __a(__b); // require copy constructor
190  _Tp* __ptr _IsUnused = &__a; // require address of operator
191  __const_constraints(__a);
192  }
193  void __const_constraints(const _Tp& __a) {
194  _Tp __c _IsUnused(__a); // require const copy constructor
195  const _Tp* __ptr _IsUnused = &__a; // require const address of operator
196  }
197  _Tp __b;
198  };
199 
200  // The SGI STL version of Assignable requires copy constructor and operator=
201  template <class _Tp>
202  struct _SGIAssignableConcept
203  {
204  void __constraints() {
205  _Tp __b _IsUnused(__a);
206  __a = __a; // require assignment operator
207  __const_constraints(__a);
208  }
209  void __const_constraints(const _Tp& __b) {
210  _Tp __c _IsUnused(__b);
211  __a = __b; // const required for argument to assignment
212  }
213  _Tp __a;
214  };
215 
216  template <class _From, class _To>
217  struct _ConvertibleConcept
218  {
219  void __constraints() {
220  _To __y _IsUnused = __x;
221  }
222  _From __x;
223  };
224 
225  // The C++ standard requirements for many concepts talk about return
226  // types that must be "convertible to bool". The problem with this
227  // requirement is that it leaves the door open for evil proxies that
228  // define things like operator|| with strange return types. Two
229  // possible solutions are:
230  // 1) require the return type to be exactly bool
231  // 2) stay with convertible to bool, and also
232  // specify stuff about all the logical operators.
233  // For now we just test for convertible to bool.
234  template <class _Tp>
235  void __aux_require_boolean_expr(const _Tp& __t) {
236  bool __x _IsUnused = __t;
237  }
238 
239 // FIXME
240  template <class _Tp>
241  struct _EqualityComparableConcept
242  {
243  void __constraints() {
244  __aux_require_boolean_expr(__a == __b);
245  }
246  _Tp __a, __b;
247  };
248 
249  template <class _Tp>
250  struct _LessThanComparableConcept
251  {
252  void __constraints() {
253  __aux_require_boolean_expr(__a < __b);
254  }
255  _Tp __a, __b;
256  };
257 
258  // This is equivalent to SGI STL's LessThanComparable.
259  template <class _Tp>
260  struct _ComparableConcept
261  {
262  void __constraints() {
263  __aux_require_boolean_expr(__a < __b);
264  __aux_require_boolean_expr(__a > __b);
265  __aux_require_boolean_expr(__a <= __b);
266  __aux_require_boolean_expr(__a >= __b);
267  }
268  _Tp __a, __b;
269  };
270 
271 #define _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(_OP,_NAME) \
272  template <class _First, class _Second> \
273  struct _NAME { \
274  void __constraints() { (void)__constraints_(); } \
275  bool __constraints_() { \
276  return __a _OP __b; \
277  } \
278  _First __a; \
279  _Second __b; \
280  }
281 
282 #define _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(_OP,_NAME) \
283  template <class _Ret, class _First, class _Second> \
284  struct _NAME { \
285  void __constraints() { (void)__constraints_(); } \
286  _Ret __constraints_() { \
287  return __a _OP __b; \
288  } \
289  _First __a; \
290  _Second __b; \
291  }
292 
293  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(==, _EqualOpConcept);
294  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(!=, _NotEqualOpConcept);
295  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(<, _LessThanOpConcept);
296  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(<=, _LessEqualOpConcept);
297  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(>, _GreaterThanOpConcept);
298  _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT(>=, _GreaterEqualOpConcept);
299 
300  _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(+, _PlusOpConcept);
301  _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(*, _TimesOpConcept);
302  _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(/, _DivideOpConcept);
303  _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(-, _SubtractOpConcept);
304  _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(%, _ModOpConcept);
305 
306 #undef _GLIBCXX_DEFINE_BINARY_PREDICATE_OP_CONSTRAINT
307 #undef _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT
308 
309  //===========================================================================
310  // Function Object Concepts
311 
312  template <class _Func, class _Return>
313  struct _GeneratorConcept
314  {
315  void __constraints() {
316  const _Return& __r _IsUnused = __f();// require operator() member function
317  }
318  _Func __f;
319  };
320 
321 
322  template <class _Func>
323  struct _GeneratorConcept<_Func,void>
324  {
325  void __constraints() {
326  __f(); // require operator() member function
327  }
328  _Func __f;
329  };
330 
331  template <class _Func, class _Return, class _Arg>
332  struct _UnaryFunctionConcept
333  {
334  void __constraints() {
335  __r = __f(__arg); // require operator()
336  }
337  _Func __f;
338  _Arg __arg;
339  _Return __r;
340  };
341 
342  template <class _Func, class _Arg>
343  struct _UnaryFunctionConcept<_Func, void, _Arg> {
344  void __constraints() {
345  __f(__arg); // require operator()
346  }
347  _Func __f;
348  _Arg __arg;
349  };
350 
351  template <class _Func, class _Return, class _First, class _Second>
352  struct _BinaryFunctionConcept
353  {
354  void __constraints() {
355  __r = __f(__first, __second); // require operator()
356  }
357  _Func __f;
358  _First __first;
359  _Second __second;
360  _Return __r;
361  };
362 
363  template <class _Func, class _First, class _Second>
364  struct _BinaryFunctionConcept<_Func, void, _First, _Second>
365  {
366  void __constraints() {
367  __f(__first, __second); // require operator()
368  }
369  _Func __f;
370  _First __first;
371  _Second __second;
372  };
373 
374  template <class _Func, class _Arg>
375  struct _UnaryPredicateConcept
376  {
377  void __constraints() {
378  __aux_require_boolean_expr(__f(__arg)); // require op() returning bool
379  }
380  _Func __f;
381  _Arg __arg;
382  };
383 
384  template <class _Func, class _First, class _Second>
385  struct _BinaryPredicateConcept
386  {
387  void __constraints() {
388  __aux_require_boolean_expr(__f(__a, __b)); // require op() returning bool
389  }
390  _Func __f;
391  _First __a;
392  _Second __b;
393  };
394 
395  // use this when functor is used inside a container class like std::set
396  template <class _Func, class _First, class _Second>
397  struct _Const_BinaryPredicateConcept {
398  void __constraints() {
399  __const_constraints(__f);
400  }
401  void __const_constraints(const _Func& __fun) {
402  __function_requires<_BinaryPredicateConcept<_Func, _First, _Second> >();
403  // operator() must be a const member function
404  __aux_require_boolean_expr(__fun(__a, __b));
405  }
406  _Func __f;
407  _First __a;
408  _Second __b;
409  };
410 
411  //===========================================================================
412  // Iterator Concepts
413 
414  template <class _Tp>
415  struct _TrivialIteratorConcept
416  {
417  void __constraints() {
418 // __function_requires< _DefaultConstructibleConcept<_Tp> >();
419  __function_requires< _AssignableConcept<_Tp> >();
420  __function_requires< _EqualityComparableConcept<_Tp> >();
421 // typedef typename std::iterator_traits<_Tp>::value_type _V;
422  (void)*__i; // require dereference operator
423  }
424  _Tp __i;
425  };
426 
427  template <class _Tp>
428  struct _Mutable_TrivialIteratorConcept
429  {
430  void __constraints() {
431  __function_requires< _TrivialIteratorConcept<_Tp> >();
432  *__i = *__j; // require dereference and assignment
433  }
434  _Tp __i, __j;
435  };
436 
437  template <class _Tp>
438  struct _InputIteratorConcept
439  {
440  void __constraints() {
441  __function_requires< _TrivialIteratorConcept<_Tp> >();
442  // require iterator_traits typedef's
443  typedef typename std::iterator_traits<_Tp>::difference_type _Diff;
444 // __function_requires< _SignedIntegerConcept<_Diff> >();
445  typedef typename std::iterator_traits<_Tp>::reference _Ref;
446  typedef typename std::iterator_traits<_Tp>::pointer _Pt;
447  typedef typename std::iterator_traits<_Tp>::iterator_category _Cat;
448  __function_requires< _ConvertibleConcept<
449  typename std::iterator_traits<_Tp>::iterator_category,
451  ++__i; // require preincrement operator
452  __i++; // require postincrement operator
453  }
454  _Tp __i;
455  };
456 
457  template <class _Tp, class _ValueT>
458  struct _OutputIteratorConcept
459  {
460  void __constraints() {
461  __function_requires< _AssignableConcept<_Tp> >();
462  ++__i; // require preincrement operator
463  __i++; // require postincrement operator
464  *__i++ = __t; // require postincrement and assignment
465  }
466  _Tp __i;
467  _ValueT __t;
468  };
469 
470  template <class _Tp>
471  struct _ForwardIteratorConcept
472  {
473  void __constraints() {
474  __function_requires< _InputIteratorConcept<_Tp> >();
475  __function_requires< _DefaultConstructibleConcept<_Tp> >();
476  __function_requires< _ConvertibleConcept<
477  typename std::iterator_traits<_Tp>::iterator_category,
479  typedef typename std::iterator_traits<_Tp>::reference _Ref;
480  _Ref __r _IsUnused = *__i;
481  }
482  _Tp __i;
483  };
484 
485  template <class _Tp>
486  struct _Mutable_ForwardIteratorConcept
487  {
488  void __constraints() {
489  __function_requires< _ForwardIteratorConcept<_Tp> >();
490  *__i++ = *__i; // require postincrement and assignment
491  }
492  _Tp __i;
493  };
494 
495  template <class _Tp>
496  struct _BidirectionalIteratorConcept
497  {
498  void __constraints() {
499  __function_requires< _ForwardIteratorConcept<_Tp> >();
500  __function_requires< _ConvertibleConcept<
501  typename std::iterator_traits<_Tp>::iterator_category,
503  --__i; // require predecrement operator
504  __i--; // require postdecrement operator
505  }
506  _Tp __i;
507  };
508 
509  template <class _Tp>
510  struct _Mutable_BidirectionalIteratorConcept
511  {
512  void __constraints() {
513  __function_requires< _BidirectionalIteratorConcept<_Tp> >();
514  __function_requires< _Mutable_ForwardIteratorConcept<_Tp> >();
515  *__i-- = *__i; // require postdecrement and assignment
516  }
517  _Tp __i;
518  };
519 
520 
521  template <class _Tp>
522  struct _RandomAccessIteratorConcept
523  {
524  void __constraints() {
525  __function_requires< _BidirectionalIteratorConcept<_Tp> >();
526  __function_requires< _ComparableConcept<_Tp> >();
527  __function_requires< _ConvertibleConcept<
528  typename std::iterator_traits<_Tp>::iterator_category,
530  // ??? We don't use _Ref, are we just checking for "referenceability"?
531  typedef typename std::iterator_traits<_Tp>::reference _Ref;
532 
533  __i += __n; // require assignment addition operator
534  __i = __i + __n; __i = __n + __i; // require addition with difference type
535  __i -= __n; // require assignment subtraction op
536  __i = __i - __n; // require subtraction with
537  // difference type
538  __n = __i - __j; // require difference operator
539  (void)__i[__n]; // require element access operator
540  }
541  _Tp __a, __b;
542  _Tp __i, __j;
543  typename std::iterator_traits<_Tp>::difference_type __n;
544  };
545 
546  template <class _Tp>
547  struct _Mutable_RandomAccessIteratorConcept
548  {
549  void __constraints() {
550  __function_requires< _RandomAccessIteratorConcept<_Tp> >();
551  __function_requires< _Mutable_BidirectionalIteratorConcept<_Tp> >();
552  __i[__n] = *__i; // require element access and assignment
553  }
554  _Tp __i;
555  typename std::iterator_traits<_Tp>::difference_type __n;
556  };
557 
558  //===========================================================================
559  // Container Concepts
560 
561  template <class _Container>
562  struct _ContainerConcept
563  {
564  typedef typename _Container::value_type _Value_type;
565  typedef typename _Container::difference_type _Difference_type;
566  typedef typename _Container::size_type _Size_type;
567  typedef typename _Container::const_reference _Const_reference;
568  typedef typename _Container::const_pointer _Const_pointer;
569  typedef typename _Container::const_iterator _Const_iterator;
570 
571  void __constraints() {
572  __function_requires< _InputIteratorConcept<_Const_iterator> >();
573  __function_requires< _AssignableConcept<_Container> >();
574  const _Container __c;
575  __i = __c.begin();
576  __i = __c.end();
577  __n = __c.size();
578  __n = __c.max_size();
579  __b = __c.empty();
580  }
581  bool __b;
582  _Const_iterator __i;
583  _Size_type __n;
584  };
585 
586  template <class _Container>
587  struct _Mutable_ContainerConcept
588  {
589  typedef typename _Container::value_type _Value_type;
590  typedef typename _Container::reference _Reference;
591  typedef typename _Container::iterator _Iterator;
592  typedef typename _Container::pointer _Pointer;
593 
594  void __constraints() {
595  __function_requires< _ContainerConcept<_Container> >();
596  __function_requires< _AssignableConcept<_Value_type> >();
597  __function_requires< _InputIteratorConcept<_Iterator> >();
598 
599  __i = __c.begin();
600  __i = __c.end();
601  __c.swap(__c2);
602  }
603  _Iterator __i;
604  _Container __c, __c2;
605  };
606 
607  template <class _ForwardContainer>
608  struct _ForwardContainerConcept
609  {
610  void __constraints() {
611  __function_requires< _ContainerConcept<_ForwardContainer> >();
612  typedef typename _ForwardContainer::const_iterator _Const_iterator;
613  __function_requires< _ForwardIteratorConcept<_Const_iterator> >();
614  }
615  };
616 
617  template <class _ForwardContainer>
618  struct _Mutable_ForwardContainerConcept
619  {
620  void __constraints() {
621  __function_requires< _ForwardContainerConcept<_ForwardContainer> >();
622  __function_requires< _Mutable_ContainerConcept<_ForwardContainer> >();
623  typedef typename _ForwardContainer::iterator _Iterator;
624  __function_requires< _Mutable_ForwardIteratorConcept<_Iterator> >();
625  }
626  };
627 
628  template <class _ReversibleContainer>
629  struct _ReversibleContainerConcept
630  {
631  typedef typename _ReversibleContainer::const_iterator _Const_iterator;
632  typedef typename _ReversibleContainer::const_reverse_iterator
633  _Const_reverse_iterator;
634 
635  void __constraints() {
636  __function_requires< _ForwardContainerConcept<_ReversibleContainer> >();
637  __function_requires< _BidirectionalIteratorConcept<_Const_iterator> >();
638  __function_requires<
639  _BidirectionalIteratorConcept<_Const_reverse_iterator> >();
640 
641  const _ReversibleContainer __c;
642  _Const_reverse_iterator __i = __c.rbegin();
643  __i = __c.rend();
644  }
645  };
646 
647  template <class _ReversibleContainer>
648  struct _Mutable_ReversibleContainerConcept
649  {
650  typedef typename _ReversibleContainer::iterator _Iterator;
651  typedef typename _ReversibleContainer::reverse_iterator _Reverse_iterator;
652 
653  void __constraints() {
654  __function_requires<_ReversibleContainerConcept<_ReversibleContainer> >();
655  __function_requires<
656  _Mutable_ForwardContainerConcept<_ReversibleContainer> >();
657  __function_requires<_Mutable_BidirectionalIteratorConcept<_Iterator> >();
658  __function_requires<
659  _Mutable_BidirectionalIteratorConcept<_Reverse_iterator> >();
660 
661  _Reverse_iterator __i = __c.rbegin();
662  __i = __c.rend();
663  }
664  _ReversibleContainer __c;
665  };
666 
667  template <class _RandomAccessContainer>
668  struct _RandomAccessContainerConcept
669  {
670  typedef typename _RandomAccessContainer::size_type _Size_type;
671  typedef typename _RandomAccessContainer::const_reference _Const_reference;
672  typedef typename _RandomAccessContainer::const_iterator _Const_iterator;
673  typedef typename _RandomAccessContainer::const_reverse_iterator
674  _Const_reverse_iterator;
675 
676  void __constraints() {
677  __function_requires<
678  _ReversibleContainerConcept<_RandomAccessContainer> >();
679  __function_requires< _RandomAccessIteratorConcept<_Const_iterator> >();
680  __function_requires<
681  _RandomAccessIteratorConcept<_Const_reverse_iterator> >();
682 
683  const _RandomAccessContainer __c;
684  _Const_reference __r _IsUnused = __c[__n];
685  }
686  _Size_type __n;
687  };
688 
689  template <class _RandomAccessContainer>
690  struct _Mutable_RandomAccessContainerConcept
691  {
692  typedef typename _RandomAccessContainer::size_type _Size_type;
693  typedef typename _RandomAccessContainer::reference _Reference;
694  typedef typename _RandomAccessContainer::iterator _Iterator;
695  typedef typename _RandomAccessContainer::reverse_iterator _Reverse_iterator;
696 
697  void __constraints() {
698  __function_requires<
699  _RandomAccessContainerConcept<_RandomAccessContainer> >();
700  __function_requires<
701  _Mutable_ReversibleContainerConcept<_RandomAccessContainer> >();
702  __function_requires< _Mutable_RandomAccessIteratorConcept<_Iterator> >();
703  __function_requires<
704  _Mutable_RandomAccessIteratorConcept<_Reverse_iterator> >();
705 
706  _Reference __r _IsUnused = __c[__i];
707  }
708  _Size_type __i;
709  _RandomAccessContainer __c;
710  };
711 
712  // A Sequence is inherently mutable
713  template <class _Sequence>
714  struct _SequenceConcept
715  {
716  typedef typename _Sequence::reference _Reference;
717  typedef typename _Sequence::const_reference _Const_reference;
718 
719  void __constraints() {
720  // Matt Austern's book puts DefaultConstructible here, the C++
721  // standard places it in Container
722  // function_requires< DefaultConstructible<Sequence> >();
723  __function_requires< _Mutable_ForwardContainerConcept<_Sequence> >();
724  __function_requires< _DefaultConstructibleConcept<_Sequence> >();
725 
726  _Sequence
727  __c _IsUnused(__n, __t),
728  __c2 _IsUnused(__first, __last);
729 
730  __c.insert(__p, __t);
731  __c.insert(__p, __n, __t);
732  __c.insert(__p, __first, __last);
733 
734  __c.erase(__p);
735  __c.erase(__p, __q);
736 
737  _Reference __r _IsUnused = __c.front();
738 
739  __const_constraints(__c);
740  }
741  void __const_constraints(const _Sequence& __c) {
742  _Const_reference __r _IsUnused = __c.front();
743  }
744  typename _Sequence::value_type __t;
745  typename _Sequence::size_type __n;
746  typename _Sequence::value_type *__first, *__last;
747  typename _Sequence::iterator __p, __q;
748  };
749 
750  template <class _FrontInsertionSequence>
751  struct _FrontInsertionSequenceConcept
752  {
753  void __constraints() {
754  __function_requires< _SequenceConcept<_FrontInsertionSequence> >();
755 
756  __c.push_front(__t);
757  __c.pop_front();
758  }
759  _FrontInsertionSequence __c;
760  typename _FrontInsertionSequence::value_type __t;
761  };
762 
763  template <class _BackInsertionSequence>
764  struct _BackInsertionSequenceConcept
765  {
766  typedef typename _BackInsertionSequence::reference _Reference;
767  typedef typename _BackInsertionSequence::const_reference _Const_reference;
768 
769  void __constraints() {
770  __function_requires< _SequenceConcept<_BackInsertionSequence> >();
771 
772  __c.push_back(__t);
773  __c.pop_back();
774  _Reference __r _IsUnused = __c.back();
775  }
776  void __const_constraints(const _BackInsertionSequence& __c) {
777  _Const_reference __r _IsUnused = __c.back();
778  };
779  _BackInsertionSequence __c;
780  typename _BackInsertionSequence::value_type __t;
781  };
782 
783 _GLIBCXX_END_NAMESPACE_VERSION
784 } // namespace
785 
786 #undef _IsUnused
787 
788 #endif // _GLIBCXX_BOOST_CONCEPT_CHECK
789 
790 
Forward iterators support a superset of input iterator operations.
GNU extensions for public use.
Random-access iterators support a superset of bidirectional iterator operations.
Marking input iterators.
Bidirectional iterators support a superset of forward iterator operations.