iterator revision 262801 
1// -*- C++ -*-
2//===-------------------------- iterator ----------------------------------===//
3//
4//                     The LLVM Compiler Infrastructure
5//
6// This file is dual licensed under the MIT and the University of Illinois Open
7// Source Licenses. See LICENSE.TXT for details.
8//
9//===----------------------------------------------------------------------===//
10
11#ifndef _LIBCPP_ITERATOR
12#define _LIBCPP_ITERATOR
13
14/*
15    iterator synopsis
16
17namespace std
18{
19
20template<class Iterator>
21struct iterator_traits
22{
23    typedef typename Iterator::difference_type difference_type;
24    typedef typename Iterator::value_type value_type;
25    typedef typename Iterator::pointer pointer;
26    typedef typename Iterator::reference reference;
27    typedef typename Iterator::iterator_category iterator_category;
28};
29
30template<class T>
31struct iterator_traits<T*>
32{
33    typedef ptrdiff_t difference_type;
34    typedef T value_type;
35    typedef T* pointer;
36    typedef T& reference;
37    typedef random_access_iterator_tag iterator_category;
38};
39
40template<class T>
41struct iterator_traits<const T*>
42{
43    typedef ptrdiff_t difference_type;
44    typedef T value_type;
45    typedef const T* pointer;
46    typedef const T& reference;
47    typedef random_access_iterator_tag iterator_category;
48};
49
50template<class Category, class T, class Distance = ptrdiff_t,
51         class Pointer = T*, class Reference = T&>
52struct iterator
53{
54    typedef T         value_type;
55    typedef Distance  difference_type;
56    typedef Pointer   pointer;
57    typedef Reference reference;
58    typedef Category  iterator_category;
59};
60
61struct input_iterator_tag  {};
62struct output_iterator_tag {};
63struct forward_iterator_tag       : public input_iterator_tag         {};
64struct bidirectional_iterator_tag : public forward_iterator_tag       {};
65struct random_access_iterator_tag : public bidirectional_iterator_tag {};
66
67// extension: second argument not conforming to C++03
68template <class InputIterator>
69void advance(InputIterator& i,
70             typename iterator_traits<InputIterator>::difference_type n);
71
72template <class InputIterator>
73typename iterator_traits<InputIterator>::difference_type
74distance(InputIterator first, InputIterator last);
75
76template <class Iterator>
77class reverse_iterator
78    : public iterator<typename iterator_traits<Iterator>::iterator_category,
79                      typename iterator_traits<Iterator>::value_type,
80                      typename iterator_traits<Iterator>::difference_type,
81                      typename iterator_traits<Iterator>::pointer,
82                      typename iterator_traits<Iterator>::reference>
83{
84protected:
85    Iterator current;
86public:
87    typedef Iterator                                            iterator_type;
88    typedef typename iterator_traits<Iterator>::difference_type difference_type;
89    typedef typename iterator_traits<Iterator>::reference       reference;
90    typedef typename iterator_traits<Iterator>::pointer         pointer;
91
92    reverse_iterator();
93    explicit reverse_iterator(Iterator x);
94    template <class U> reverse_iterator(const reverse_iterator<U>& u);
95    Iterator base() const;
96    reference operator*() const;
97    pointer   operator->() const;
98    reverse_iterator& operator++();
99    reverse_iterator  operator++(int);
100    reverse_iterator& operator--();
101    reverse_iterator  operator--(int);
102    reverse_iterator  operator+ (difference_type n) const;
103    reverse_iterator& operator+=(difference_type n);
104    reverse_iterator  operator- (difference_type n) const;
105    reverse_iterator& operator-=(difference_type n);
106    reference         operator[](difference_type n) const;
107};
108
109template <class Iterator1, class Iterator2>
110bool
111operator==(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
112
113template <class Iterator1, class Iterator2>
114bool
115operator<(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
116
117template <class Iterator1, class Iterator2>
118bool
119operator!=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
120
121template <class Iterator1, class Iterator2>
122bool
123operator>(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
124
125template <class Iterator1, class Iterator2>
126bool
127operator>=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
128
129template <class Iterator1, class Iterator2>
130bool
131operator<=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
132
133template <class Iterator1, class Iterator2>
134typename reverse_iterator<Iterator1>::difference_type
135operator-(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
136
137template <class Iterator>
138reverse_iterator<Iterator>
139operator+(typename reverse_iterator<Iterator>::difference_type n, const reverse_iterator<Iterator>& x);
140
141template <class Container>
142class back_insert_iterator
143{
144protected:
145    Container* container;
146public:
147    typedef Container                   container_type;
148    typedef void                        value_type;
149    typedef void                        difference_type;
150    typedef back_insert_iterator<Cont>& reference;
151    typedef void                        pointer;
152
153    explicit back_insert_iterator(Container& x);
154    back_insert_iterator& operator=(const typename Container::value_type& value);
155    back_insert_iterator& operator*();
156    back_insert_iterator& operator++();
157    back_insert_iterator  operator++(int);
158};
159
160template <class Container> back_insert_iterator<Container> back_inserter(Container& x);
161
162template <class Container>
163class front_insert_iterator
164{
165protected:
166    Container* container;
167public:
168    typedef Container                    container_type;
169    typedef void                         value_type;
170    typedef void                         difference_type;
171    typedef front_insert_iterator<Cont>& reference;
172    typedef void                         pointer;
173
174    explicit front_insert_iterator(Container& x);
175    front_insert_iterator& operator=(const typename Container::value_type& value);
176    front_insert_iterator& operator*();
177    front_insert_iterator& operator++();
178    front_insert_iterator  operator++(int);
179};
180
181template <class Container> front_insert_iterator<Container> front_inserter(Container& x);
182
183template <class Container>
184class insert_iterator
185{
186protected:
187    Container* container;
188    typename Container::iterator iter;
189public:
190    typedef Container              container_type;
191    typedef void                   value_type;
192    typedef void                   difference_type;
193    typedef insert_iterator<Cont>& reference;
194    typedef void                   pointer;
195
196    insert_iterator(Container& x, typename Container::iterator i);
197    insert_iterator& operator=(const typename Container::value_type& value);
198    insert_iterator& operator*();
199    insert_iterator& operator++();
200    insert_iterator& operator++(int);
201};
202
203template <class Container, class Iterator>
204insert_iterator<Container> inserter(Container& x, Iterator i);
205
206template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t>
207class istream_iterator
208    : public iterator<input_iterator_tag, T, Distance, const T*, const T&>
209{
210public:
211    typedef charT char_type;
212    typedef traits traits_type;
213    typedef basic_istream<charT,traits> istream_type;
214
215    istream_iterator();
216    istream_iterator(istream_type& s);
217    istream_iterator(const istream_iterator& x);
218    ~istream_iterator();
219
220    const T& operator*() const;
221    const T* operator->() const;
222    istream_iterator& operator++();
223    istream_iterator  operator++(int);
224};
225
226template <class T, class charT, class traits, class Distance>
227bool operator==(const istream_iterator<T,charT,traits,Distance>& x,
228                const istream_iterator<T,charT,traits,Distance>& y);
229template <class T, class charT, class traits, class Distance>
230bool operator!=(const istream_iterator<T,charT,traits,Distance>& x,
231                const istream_iterator<T,charT,traits,Distance>& y);
232
233template <class T, class charT = char, class traits = char_traits<charT> >
234class ostream_iterator
235    : public iterator<output_iterator_tag, void, void, void ,void>
236{
237public:
238    typedef charT char_type;
239    typedef traits traits_type;
240    typedef basic_ostream<charT,traits> ostream_type;
241
242    ostream_iterator(ostream_type& s);
243    ostream_iterator(ostream_type& s, const charT* delimiter);
244    ostream_iterator(const ostream_iterator& x);
245    ~ostream_iterator();
246    ostream_iterator& operator=(const T& value);
247
248    ostream_iterator& operator*();
249    ostream_iterator& operator++();
250    ostream_iterator& operator++(int);
251};
252
253template<class charT, class traits = char_traits<charT> >
254class istreambuf_iterator
255    : public iterator<input_iterator_tag, charT,
256                      typename traits::off_type, unspecified,
257                      charT>
258{
259public:
260    typedef charT                         char_type;
261    typedef traits                        traits_type;
262    typedef typename traits::int_type     int_type;
263    typedef basic_streambuf<charT,traits> streambuf_type;
264    typedef basic_istream<charT,traits>   istream_type;
265
266    istreambuf_iterator() noexcept;
267    istreambuf_iterator(istream_type& s) noexcept;
268    istreambuf_iterator(streambuf_type* s) noexcept;
269    istreambuf_iterator(a-private-type) noexcept;
270
271    charT                operator*() const;
272    pointer operator->() const;
273    istreambuf_iterator& operator++();
274    a-private-type       operator++(int);
275
276    bool equal(const istreambuf_iterator& b) const;
277};
278
279template <class charT, class traits>
280bool operator==(const istreambuf_iterator<charT,traits>& a,
281                const istreambuf_iterator<charT,traits>& b);
282template <class charT, class traits>
283bool operator!=(const istreambuf_iterator<charT,traits>& a,
284                const istreambuf_iterator<charT,traits>& b);
285
286template <class charT, class traits = char_traits<charT> >
287class ostreambuf_iterator
288    : public iterator<output_iterator_tag, void, void, void, void>
289{
290public:
291    typedef charT                         char_type;
292    typedef traits                        traits_type;
293    typedef basic_streambuf<charT,traits> streambuf_type;
294    typedef basic_ostream<charT,traits>   ostream_type;
295
296    ostreambuf_iterator(ostream_type& s) noexcept;
297    ostreambuf_iterator(streambuf_type* s) noexcept;
298    ostreambuf_iterator& operator=(charT c);
299    ostreambuf_iterator& operator*();
300    ostreambuf_iterator& operator++();
301    ostreambuf_iterator& operator++(int);
302    bool failed() const noexcept;
303};
304
305template <class C> auto begin(C& c) -> decltype(c.begin());
306template <class C> auto begin(const C& c) -> decltype(c.begin());
307template <class C> auto end(C& c) -> decltype(c.end());
308template <class C> auto end(const C& c) -> decltype(c.end());
309template <class T, size_t N> T* begin(T (&array)[N]);
310template <class T, size_t N> T* end(T (&array)[N]);
311
312template <class C> auto cbegin(const C& c) -> decltype(std::begin(c));        // C++14
313template <class C> auto cend(const C& c) -> decltype(std::end(c));            // C++14
314template <class C> auto rbegin(C& c) -> decltype(c.rbegin());                 // C++14
315template <class C> auto rbegin(const C& c) -> decltype(c.rbegin());           // C++14
316template <class C> auto rend(C& c) -> decltype(c.rend());                     // C++14
317template <class C> auto rend(const C& c) -> decltype(c.rend());               // C++14
318template <class E> reverse_iterator<const E*> rbegin(initializer_list<E> il); // C++14
319template <class E> reverse_iterator<const E*> rend(initializer_list<E> il);   // C++14
320template <class T, size_t N> reverse_iterator<T*> rbegin(T (&array)[N]);      // C++14
321template <class T, size_t N> reverse_iterator<T*> rend(T (&array)[N]);        // C++14
322template <class C> auto crbegin(const C& c) -> decltype(std::rbegin(c));      // C++14
323template <class C> auto crend(const C& c) -> decltype(std::rend(c));          // C++14
324
325}  // std
326
327*/
328
329#include <__config>
330#include <type_traits>
331#include <cstddef>
332#include <iosfwd>
333#include <initializer_list>
334#ifdef __APPLE__
335#include <Availability.h>
336#endif
337
338#ifdef _LIBCPP_DEBUG
339#   include <__debug>
340#else
341#   define _LIBCPP_ASSERT(x, m) ((void)0)
342#endif
343
344#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
345#pragma GCC system_header
346#endif
347
348_LIBCPP_BEGIN_NAMESPACE_STD
349
350struct _LIBCPP_TYPE_VIS_ONLY input_iterator_tag {};
351struct _LIBCPP_TYPE_VIS_ONLY output_iterator_tag {};
352struct _LIBCPP_TYPE_VIS_ONLY forward_iterator_tag       : public input_iterator_tag {};
353struct _LIBCPP_TYPE_VIS_ONLY bidirectional_iterator_tag : public forward_iterator_tag {};
354struct _LIBCPP_TYPE_VIS_ONLY random_access_iterator_tag : public bidirectional_iterator_tag {};
355
356template <class _Tp>
357struct __has_iterator_category
358{
359private:
360    struct __two {char __lx; char __lxx;};
361    template <class _Up> static __two __test(...);
362    template <class _Up> static char __test(typename _Up::iterator_category* = 0);
363public:
364    static const bool value = sizeof(__test<_Tp>(0)) == 1;
365};
366
367template <class _Iter, bool> struct ____iterator_traits {};
368
369template <class _Iter>
370struct ____iterator_traits<_Iter, true>
371{
372    typedef typename _Iter::difference_type   difference_type;
373    typedef typename _Iter::value_type        value_type;
374    typedef typename _Iter::pointer           pointer;
375    typedef typename _Iter::reference         reference;
376    typedef typename _Iter::iterator_category iterator_category;
377};
378
379template <class _Iter, bool> struct __iterator_traits {};
380
381template <class _Iter>
382struct __iterator_traits<_Iter, true>
383    :  ____iterator_traits
384      <
385        _Iter,
386        is_convertible<typename _Iter::iterator_category, input_iterator_tag>::value ||
387        is_convertible<typename _Iter::iterator_category, output_iterator_tag>::value
388      >
389{};
390
391// iterator_traits<Iterator> will only have the nested types if Iterator::iterator_category
392//    exists.  Else iterator_traits<Iterator> will be an empty class.  This is a
393//    conforming extension which allows some programs to compile and behave as
394//    the client expects instead of failing at compile time.
395
396template <class _Iter>
397struct _LIBCPP_TYPE_VIS_ONLY iterator_traits
398    : __iterator_traits<_Iter, __has_iterator_category<_Iter>::value> {};
399
400template<class _Tp>
401struct _LIBCPP_TYPE_VIS_ONLY iterator_traits<_Tp*>
402{
403    typedef ptrdiff_t difference_type;
404    typedef typename remove_const<_Tp>::type value_type;
405    typedef _Tp* pointer;
406    typedef _Tp& reference;
407    typedef random_access_iterator_tag iterator_category;
408};
409
410template <class _Tp, class _Up, bool = __has_iterator_category<iterator_traits<_Tp> >::value>
411struct __has_iterator_category_convertible_to
412    : public integral_constant<bool, is_convertible<typename iterator_traits<_Tp>::iterator_category, _Up>::value>
413{};
414
415template <class _Tp, class _Up>
416struct __has_iterator_category_convertible_to<_Tp, _Up, false> : public false_type {};
417
418template <class _Tp>
419struct __is_input_iterator : public __has_iterator_category_convertible_to<_Tp, input_iterator_tag> {};
420
421template <class _Tp>
422struct __is_forward_iterator : public __has_iterator_category_convertible_to<_Tp, forward_iterator_tag> {};
423
424template <class _Tp>
425struct __is_bidirectional_iterator : public __has_iterator_category_convertible_to<_Tp, bidirectional_iterator_tag> {};
426
427template <class _Tp>
428struct __is_random_access_iterator : public __has_iterator_category_convertible_to<_Tp, random_access_iterator_tag> {};
429
430template<class _Category, class _Tp, class _Distance = ptrdiff_t,
431         class _Pointer = _Tp*, class _Reference = _Tp&>
432struct _LIBCPP_TYPE_VIS_ONLY iterator
433{
434    typedef _Tp        value_type;
435    typedef _Distance  difference_type;
436    typedef _Pointer   pointer;
437    typedef _Reference reference;
438    typedef _Category  iterator_category;
439};
440
441template <class _InputIter>
442inline _LIBCPP_INLINE_VISIBILITY
443void __advance(_InputIter& __i,
444             typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag)
445{
446    for (; __n > 0; --__n)
447        ++__i;
448}
449
450template <class _BiDirIter>
451inline _LIBCPP_INLINE_VISIBILITY
452void __advance(_BiDirIter& __i,
453             typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag)
454{
455    if (__n >= 0)
456        for (; __n > 0; --__n)
457            ++__i;
458    else
459        for (; __n < 0; ++__n)
460            --__i;
461}
462
463template <class _RandIter>
464inline _LIBCPP_INLINE_VISIBILITY
465void __advance(_RandIter& __i,
466             typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag)
467{
468   __i += __n;
469}
470
471template <class _InputIter>
472inline _LIBCPP_INLINE_VISIBILITY
473void advance(_InputIter& __i,
474             typename iterator_traits<_InputIter>::difference_type __n)
475{
476    __advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category());
477}
478
479template <class _InputIter>
480inline _LIBCPP_INLINE_VISIBILITY
481typename iterator_traits<_InputIter>::difference_type
482__distance(_InputIter __first, _InputIter __last, input_iterator_tag)
483{
484    typename iterator_traits<_InputIter>::difference_type __r(0);
485    for (; __first != __last; ++__first)
486        ++__r;
487    return __r;
488}
489
490template <class _RandIter>
491inline _LIBCPP_INLINE_VISIBILITY
492typename iterator_traits<_RandIter>::difference_type
493__distance(_RandIter __first, _RandIter __last, random_access_iterator_tag)
494{
495    return __last - __first;
496}
497
498template <class _InputIter>
499inline _LIBCPP_INLINE_VISIBILITY
500typename iterator_traits<_InputIter>::difference_type
501distance(_InputIter __first, _InputIter __last)
502{
503    return __distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category());
504}
505
506template <class _ForwardIter>
507inline _LIBCPP_INLINE_VISIBILITY
508_ForwardIter
509next(_ForwardIter __x,
510     typename iterator_traits<_ForwardIter>::difference_type __n = 1,
511     typename enable_if<__is_forward_iterator<_ForwardIter>::value>::type* = 0)
512{
513    _VSTD::advance(__x, __n);
514    return __x;
515}
516
517template <class _BidiretionalIter>
518inline _LIBCPP_INLINE_VISIBILITY
519_BidiretionalIter
520prev(_BidiretionalIter __x,
521     typename iterator_traits<_BidiretionalIter>::difference_type __n = 1,
522     typename enable_if<__is_bidirectional_iterator<_BidiretionalIter>::value>::type* = 0)
523{
524    _VSTD::advance(__x, -__n);
525    return __x;
526}
527
528template <class _Iter>
529class _LIBCPP_TYPE_VIS_ONLY reverse_iterator
530    : public iterator<typename iterator_traits<_Iter>::iterator_category,
531                      typename iterator_traits<_Iter>::value_type,
532                      typename iterator_traits<_Iter>::difference_type,
533                      typename iterator_traits<_Iter>::pointer,
534                      typename iterator_traits<_Iter>::reference>
535{
536private:
537    mutable _Iter __t;
538protected:
539    _Iter current;
540public:
541    typedef _Iter                                            iterator_type;
542    typedef typename iterator_traits<_Iter>::difference_type difference_type;
543    typedef typename iterator_traits<_Iter>::reference       reference;
544    typedef typename iterator_traits<_Iter>::pointer         pointer;
545
546    _LIBCPP_INLINE_VISIBILITY reverse_iterator() : current() {}
547    _LIBCPP_INLINE_VISIBILITY explicit reverse_iterator(_Iter __x) : __t(__x), current(__x) {}
548    template <class _Up> _LIBCPP_INLINE_VISIBILITY reverse_iterator(const reverse_iterator<_Up>& __u)
549        : __t(__u.base()), current(__u.base()) {}
550    _LIBCPP_INLINE_VISIBILITY _Iter base() const {return current;}
551    _LIBCPP_INLINE_VISIBILITY reference operator*() const {__t = current; return *--__t;}
552    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const {return &(operator*());}
553    _LIBCPP_INLINE_VISIBILITY reverse_iterator& operator++() {--current; return *this;}
554    _LIBCPP_INLINE_VISIBILITY reverse_iterator  operator++(int)
555        {reverse_iterator __tmp(*this); --current; return __tmp;}
556    _LIBCPP_INLINE_VISIBILITY reverse_iterator& operator--() {++current; return *this;}
557    _LIBCPP_INLINE_VISIBILITY reverse_iterator  operator--(int)
558        {reverse_iterator __tmp(*this); ++current; return __tmp;}
559    _LIBCPP_INLINE_VISIBILITY reverse_iterator  operator+ (difference_type __n) const
560        {return reverse_iterator(current - __n);}
561    _LIBCPP_INLINE_VISIBILITY reverse_iterator& operator+=(difference_type __n)
562        {current -= __n; return *this;}
563    _LIBCPP_INLINE_VISIBILITY reverse_iterator  operator- (difference_type __n) const
564        {return reverse_iterator(current + __n);}
565    _LIBCPP_INLINE_VISIBILITY reverse_iterator& operator-=(difference_type __n)
566        {current += __n; return *this;}
567    _LIBCPP_INLINE_VISIBILITY reference         operator[](difference_type __n) const
568        {return current[-__n-1];}
569};
570
571template <class _Iter1, class _Iter2>
572inline _LIBCPP_INLINE_VISIBILITY
573bool
574operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
575{
576    return __x.base() == __y.base();
577}
578
579template <class _Iter1, class _Iter2>
580inline _LIBCPP_INLINE_VISIBILITY
581bool
582operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
583{
584    return __x.base() > __y.base();
585}
586
587template <class _Iter1, class _Iter2>
588inline _LIBCPP_INLINE_VISIBILITY
589bool
590operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
591{
592    return __x.base() != __y.base();
593}
594
595template <class _Iter1, class _Iter2>
596inline _LIBCPP_INLINE_VISIBILITY
597bool
598operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
599{
600    return __x.base() < __y.base();
601}
602
603template <class _Iter1, class _Iter2>
604inline _LIBCPP_INLINE_VISIBILITY
605bool
606operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
607{
608    return __x.base() <= __y.base();
609}
610
611template <class _Iter1, class _Iter2>
612inline _LIBCPP_INLINE_VISIBILITY
613bool
614operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
615{
616    return __x.base() >= __y.base();
617}
618
619template <class _Iter1, class _Iter2>
620inline _LIBCPP_INLINE_VISIBILITY
621typename reverse_iterator<_Iter1>::difference_type
622operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
623{
624    return __y.base() - __x.base();
625}
626
627template <class _Iter>
628inline _LIBCPP_INLINE_VISIBILITY
629reverse_iterator<_Iter>
630operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_iterator<_Iter>& __x)
631{
632    return reverse_iterator<_Iter>(__x.base() - __n);
633}
634
635template <class _Container>
636class _LIBCPP_TYPE_VIS_ONLY back_insert_iterator
637    : public iterator<output_iterator_tag,
638                      void,
639                      void,
640                      void,
641                      back_insert_iterator<_Container>&>
642{
643protected:
644    _Container* container;
645public:
646    typedef _Container container_type;
647
648    _LIBCPP_INLINE_VISIBILITY explicit back_insert_iterator(_Container& __x) : container(&__x) {}
649    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(const typename _Container::value_type& __value_)
650        {container->push_back(__value_); return *this;}
651#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
652    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(typename _Container::value_type&& __value_)
653        {container->push_back(_VSTD::move(__value_)); return *this;}
654#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
655    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator*()     {return *this;}
656    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator++()    {return *this;}
657    _LIBCPP_INLINE_VISIBILITY back_insert_iterator  operator++(int) {return *this;}
658};
659
660template <class _Container>
661inline _LIBCPP_INLINE_VISIBILITY
662back_insert_iterator<_Container>
663back_inserter(_Container& __x)
664{
665    return back_insert_iterator<_Container>(__x);
666}
667
668template <class _Container>
669class _LIBCPP_TYPE_VIS_ONLY front_insert_iterator
670    : public iterator<output_iterator_tag,
671                      void,
672                      void,
673                      void,
674                      front_insert_iterator<_Container>&>
675{
676protected:
677    _Container* container;
678public:
679    typedef _Container container_type;
680
681    _LIBCPP_INLINE_VISIBILITY explicit front_insert_iterator(_Container& __x) : container(&__x) {}
682    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(const typename _Container::value_type& __value_)
683        {container->push_front(__value_); return *this;}
684#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
685    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(typename _Container::value_type&& __value_)
686        {container->push_front(_VSTD::move(__value_)); return *this;}
687#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
688    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator*()     {return *this;}
689    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator++()    {return *this;}
690    _LIBCPP_INLINE_VISIBILITY front_insert_iterator  operator++(int) {return *this;}
691};
692
693template <class _Container>
694inline _LIBCPP_INLINE_VISIBILITY
695front_insert_iterator<_Container>
696front_inserter(_Container& __x)
697{
698    return front_insert_iterator<_Container>(__x);
699}
700
701template <class _Container>
702class _LIBCPP_TYPE_VIS_ONLY insert_iterator
703    : public iterator<output_iterator_tag,
704                      void,
705                      void,
706                      void,
707                      insert_iterator<_Container>&>
708{
709protected:
710    _Container* container;
711    typename _Container::iterator iter;
712public:
713    typedef _Container container_type;
714
715    _LIBCPP_INLINE_VISIBILITY insert_iterator(_Container& __x, typename _Container::iterator __i)
716        : container(&__x), iter(__i) {}
717    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(const typename _Container::value_type& __value_)
718        {iter = container->insert(iter, __value_); ++iter; return *this;}
719#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
720    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(typename _Container::value_type&& __value_)
721        {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;}
722#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
723    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator*()        {return *this;}
724    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++()       {return *this;}
725    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++(int)    {return *this;}
726};
727
728template <class _Container>
729inline _LIBCPP_INLINE_VISIBILITY
730insert_iterator<_Container>
731inserter(_Container& __x, typename _Container::iterator __i)
732{
733    return insert_iterator<_Container>(__x, __i);
734}
735
736template <class _Tp, class _CharT = char,
737          class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t>
738class _LIBCPP_TYPE_VIS_ONLY istream_iterator
739    : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&>
740{
741public:
742    typedef _CharT char_type;
743    typedef _Traits traits_type;
744    typedef basic_istream<_CharT,_Traits> istream_type;
745private:
746    istream_type* __in_stream_;
747    _Tp __value_;
748public:
749    _LIBCPP_INLINE_VISIBILITY istream_iterator() : __in_stream_(0) {}
750    _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(&__s)
751        {
752            if (!(*__in_stream_ >> __value_))
753                __in_stream_ = 0;
754        }
755
756    _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;}
757    _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return &(operator*());}
758    _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++()
759        {
760            if (!(*__in_stream_ >> __value_))
761                __in_stream_ = 0;
762            return *this;
763        }
764    _LIBCPP_INLINE_VISIBILITY istream_iterator  operator++(int)
765        {istream_iterator __t(*this); ++(*this); return __t;}
766
767    friend _LIBCPP_INLINE_VISIBILITY
768    bool operator==(const istream_iterator& __x, const istream_iterator& __y)
769        {return __x.__in_stream_ == __y.__in_stream_;}
770
771    friend _LIBCPP_INLINE_VISIBILITY
772    bool operator!=(const istream_iterator& __x, const istream_iterator& __y)
773        {return !(__x == __y);}
774};
775
776template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT> >
777class _LIBCPP_TYPE_VIS_ONLY ostream_iterator
778    : public iterator<output_iterator_tag, void, void, void, void>
779{
780public:
781    typedef _CharT char_type;
782    typedef _Traits traits_type;
783    typedef basic_ostream<_CharT,_Traits> ostream_type;
784private:
785    ostream_type* __out_stream_;
786    const char_type* __delim_;
787public:
788    _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s)
789        : __out_stream_(&__s), __delim_(0) {}
790    _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter)
791        : __out_stream_(&__s), __delim_(__delimiter) {}
792    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator=(const _Tp& __value_)
793        {
794            *__out_stream_ << __value_;
795            if (__delim_)
796                *__out_stream_ << __delim_;
797            return *this;
798        }
799
800    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator*()     {return *this;}
801    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++()    {return *this;}
802    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++(int) {return *this;}
803};
804
805template<class _CharT, class _Traits>
806class _LIBCPP_TYPE_VIS_ONLY istreambuf_iterator
807    : public iterator<input_iterator_tag, _CharT,
808                      typename _Traits::off_type, _CharT*,
809                      _CharT>
810{
811public:
812    typedef _CharT                          char_type;
813    typedef _Traits                         traits_type;
814    typedef typename _Traits::int_type      int_type;
815    typedef basic_streambuf<_CharT,_Traits> streambuf_type;
816    typedef basic_istream<_CharT,_Traits>   istream_type;
817private:
818    mutable streambuf_type* __sbuf_;
819
820    class __proxy
821    {
822        char_type __keep_;
823        streambuf_type* __sbuf_;
824        _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s)
825            : __keep_(__c), __sbuf_(__s) {}
826        friend class istreambuf_iterator;
827    public:
828        _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;}
829    };
830
831    _LIBCPP_INLINE_VISIBILITY
832    bool __test_for_eof() const
833    {
834        if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof()))
835            __sbuf_ = 0;
836        return __sbuf_ == 0;
837    }
838public:
839    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(0) {}
840    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT
841        : __sbuf_(__s.rdbuf()) {}
842    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT
843        : __sbuf_(__s) {}
844    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT
845        : __sbuf_(__p.__sbuf_) {}
846
847    _LIBCPP_INLINE_VISIBILITY char_type  operator*() const
848        {return static_cast<char_type>(__sbuf_->sgetc());}
849    _LIBCPP_INLINE_VISIBILITY char_type* operator->() const {return nullptr;}
850    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++()
851        {
852            __sbuf_->sbumpc();
853            return *this;
854        }
855    _LIBCPP_INLINE_VISIBILITY __proxy              operator++(int)
856        {
857            return __proxy(__sbuf_->sbumpc(), __sbuf_);
858        }
859
860    _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const
861        {return __test_for_eof() == __b.__test_for_eof();}
862};
863
864template <class _CharT, class _Traits>
865inline _LIBCPP_INLINE_VISIBILITY
866bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a,
867                const istreambuf_iterator<_CharT,_Traits>& __b)
868                {return __a.equal(__b);}
869
870template <class _CharT, class _Traits>
871inline _LIBCPP_INLINE_VISIBILITY
872bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a,
873                const istreambuf_iterator<_CharT,_Traits>& __b)
874                {return !__a.equal(__b);}
875
876template <class _CharT, class _Traits>
877class _LIBCPP_TYPE_VIS_ONLY ostreambuf_iterator
878    : public iterator<output_iterator_tag, void, void, void, void>
879{
880public:
881    typedef _CharT                          char_type;
882    typedef _Traits                         traits_type;
883    typedef basic_streambuf<_CharT,_Traits> streambuf_type;
884    typedef basic_ostream<_CharT,_Traits>   ostream_type;
885private:
886    streambuf_type* __sbuf_;
887public:
888    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) _NOEXCEPT
889        : __sbuf_(__s.rdbuf()) {}
890    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT
891        : __sbuf_(__s) {}
892    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c)
893        {
894            if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof()))
895                __sbuf_ = 0;
896            return *this;
897        }
898    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*()     {return *this;}
899    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++()    {return *this;}
900    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;}
901    _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == 0;}
902
903#if !defined(__APPLE__) || \
904    (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED > __MAC_10_8) || \
905    (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED > __IPHONE_6_0)
906
907    template <class _Ch, class _Tr>
908    friend
909    _LIBCPP_HIDDEN
910    ostreambuf_iterator<_Ch, _Tr>
911    __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s,
912                     const _Ch* __ob, const _Ch* __op, const _Ch* __oe,
913                     ios_base& __iob, _Ch __fl);
914#endif
915};
916
917template <class _Iter>
918class _LIBCPP_TYPE_VIS_ONLY move_iterator
919{
920private:
921    _Iter __i;
922public:
923    typedef _Iter                                            iterator_type;
924    typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
925    typedef typename iterator_traits<iterator_type>::value_type value_type;
926    typedef typename iterator_traits<iterator_type>::difference_type difference_type;
927    typedef typename iterator_traits<iterator_type>::pointer pointer;
928#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
929    typedef value_type&& reference;
930#else
931    typedef typename iterator_traits<iterator_type>::reference reference;
932#endif
933
934    _LIBCPP_INLINE_VISIBILITY move_iterator() : __i() {}
935    _LIBCPP_INLINE_VISIBILITY explicit move_iterator(_Iter __x) : __i(__x) {}
936    template <class _Up> _LIBCPP_INLINE_VISIBILITY move_iterator(const move_iterator<_Up>& __u)
937        : __i(__u.base()) {}
938    _LIBCPP_INLINE_VISIBILITY _Iter base() const {return __i;}
939    _LIBCPP_INLINE_VISIBILITY reference operator*() const {
940      return static_cast<reference>(*__i);
941    }
942    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const {
943      typename iterator_traits<iterator_type>::reference __ref = *__i;
944      return &__ref;
945    }
946    _LIBCPP_INLINE_VISIBILITY move_iterator& operator++() {++__i; return *this;}
947    _LIBCPP_INLINE_VISIBILITY move_iterator  operator++(int)
948        {move_iterator __tmp(*this); ++__i; return __tmp;}
949    _LIBCPP_INLINE_VISIBILITY move_iterator& operator--() {--__i; return *this;}
950    _LIBCPP_INLINE_VISIBILITY move_iterator  operator--(int)
951        {move_iterator __tmp(*this); --__i; return __tmp;}
952    _LIBCPP_INLINE_VISIBILITY move_iterator  operator+ (difference_type __n) const
953        {return move_iterator(__i + __n);}
954    _LIBCPP_INLINE_VISIBILITY move_iterator& operator+=(difference_type __n)
955        {__i += __n; return *this;}
956    _LIBCPP_INLINE_VISIBILITY move_iterator  operator- (difference_type __n) const
957        {return move_iterator(__i - __n);}
958    _LIBCPP_INLINE_VISIBILITY move_iterator& operator-=(difference_type __n)
959        {__i -= __n; return *this;}
960    _LIBCPP_INLINE_VISIBILITY reference         operator[](difference_type __n) const
961    {
962      return static_cast<reference>(__i[__n]);
963    }
964};
965
966template <class _Iter1, class _Iter2>
967inline _LIBCPP_INLINE_VISIBILITY
968bool
969operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
970{
971    return __x.base() == __y.base();
972}
973
974template <class _Iter1, class _Iter2>
975inline _LIBCPP_INLINE_VISIBILITY
976bool
977operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
978{
979    return __x.base() < __y.base();
980}
981
982template <class _Iter1, class _Iter2>
983inline _LIBCPP_INLINE_VISIBILITY
984bool
985operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
986{
987    return __x.base() != __y.base();
988}
989
990template <class _Iter1, class _Iter2>
991inline _LIBCPP_INLINE_VISIBILITY
992bool
993operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
994{
995    return __x.base() > __y.base();
996}
997
998template <class _Iter1, class _Iter2>
999inline _LIBCPP_INLINE_VISIBILITY
1000bool
1001operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1002{
1003    return __x.base() >= __y.base();
1004}
1005
1006template <class _Iter1, class _Iter2>
1007inline _LIBCPP_INLINE_VISIBILITY
1008bool
1009operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1010{
1011    return __x.base() <= __y.base();
1012}
1013
1014template <class _Iter1, class _Iter2>
1015inline _LIBCPP_INLINE_VISIBILITY
1016typename move_iterator<_Iter1>::difference_type
1017operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1018{
1019    return __x.base() - __y.base();
1020}
1021
1022template <class _Iter>
1023inline _LIBCPP_INLINE_VISIBILITY
1024move_iterator<_Iter>
1025operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x)
1026{
1027    return move_iterator<_Iter>(__x.base() + __n);
1028}
1029
1030template <class _Iter>
1031inline _LIBCPP_INLINE_VISIBILITY
1032move_iterator<_Iter>
1033make_move_iterator(_Iter __i)
1034{
1035    return move_iterator<_Iter>(__i);
1036}
1037
1038// __wrap_iter
1039
1040template <class _Iter> class __wrap_iter;
1041
1042template <class _Iter1, class _Iter2>
1043_LIBCPP_INLINE_VISIBILITY
1044bool
1045operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1046
1047template <class _Iter1, class _Iter2>
1048_LIBCPP_INLINE_VISIBILITY
1049bool
1050operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1051
1052template <class _Iter1, class _Iter2>
1053_LIBCPP_INLINE_VISIBILITY
1054bool
1055operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1056
1057template <class _Iter1, class _Iter2>
1058_LIBCPP_INLINE_VISIBILITY
1059bool
1060operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1061
1062template <class _Iter1, class _Iter2>
1063_LIBCPP_INLINE_VISIBILITY
1064bool
1065operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1066
1067template <class _Iter1, class _Iter2>
1068_LIBCPP_INLINE_VISIBILITY
1069bool
1070operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1071
1072template <class _Iter1, class _Iter2>
1073_LIBCPP_INLINE_VISIBILITY
1074typename __wrap_iter<_Iter1>::difference_type
1075operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1076
1077template <class _Iter>
1078_LIBCPP_INLINE_VISIBILITY
1079__wrap_iter<_Iter>
1080operator+(typename __wrap_iter<_Iter>::difference_type, __wrap_iter<_Iter>) _NOEXCEPT;
1081
1082template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY copy(_Ip, _Ip, _Op);
1083template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY copy_backward(_B1, _B1, _B2);
1084template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY move(_Ip, _Ip, _Op);
1085template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY move_backward(_B1, _B1, _B2);
1086
1087template <class _Tp>
1088_LIBCPP_INLINE_VISIBILITY
1089typename enable_if
1090<
1091    is_trivially_copy_assignable<_Tp>::value,
1092    _Tp*
1093>::type
1094__unwrap_iter(__wrap_iter<_Tp*>);
1095
1096template <class _Iter>
1097class __wrap_iter
1098{
1099public:
1100    typedef _Iter                                                      iterator_type;
1101    typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
1102    typedef typename iterator_traits<iterator_type>::value_type        value_type;
1103    typedef typename iterator_traits<iterator_type>::difference_type   difference_type;
1104    typedef typename iterator_traits<iterator_type>::pointer           pointer;
1105    typedef typename iterator_traits<iterator_type>::reference         reference;
1106private:
1107    iterator_type __i;
1108public:
1109    _LIBCPP_INLINE_VISIBILITY __wrap_iter() _NOEXCEPT
1110#if _LIBCPP_STD_VER > 11
1111                : __i{}
1112#endif
1113    {
1114#if _LIBCPP_DEBUG_LEVEL >= 2
1115        __get_db()->__insert_i(this);
1116#endif
1117    }
1118    template <class _Up> _LIBCPP_INLINE_VISIBILITY __wrap_iter(const __wrap_iter<_Up>& __u,
1119        typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = 0) _NOEXCEPT
1120        : __i(__u.base())
1121    {
1122#if _LIBCPP_DEBUG_LEVEL >= 2
1123        __get_db()->__iterator_copy(this, &__u);
1124#endif
1125    }
1126#if _LIBCPP_DEBUG_LEVEL >= 2
1127    _LIBCPP_INLINE_VISIBILITY
1128    __wrap_iter(const __wrap_iter& __x)
1129        : __i(__x.base())
1130    {
1131        __get_db()->__iterator_copy(this, &__x);
1132    }
1133    _LIBCPP_INLINE_VISIBILITY
1134    __wrap_iter& operator=(const __wrap_iter& __x)
1135    {
1136        if (this != &__x)
1137        {
1138            __get_db()->__iterator_copy(this, &__x);
1139            __i = __x.__i;
1140        }
1141        return *this;
1142    }
1143    _LIBCPP_INLINE_VISIBILITY
1144    ~__wrap_iter()
1145    {
1146        __get_db()->__erase_i(this);
1147    }
1148#endif
1149    _LIBCPP_INLINE_VISIBILITY reference operator*() const _NOEXCEPT
1150    {
1151#if _LIBCPP_DEBUG_LEVEL >= 2
1152        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1153                       "Attempted to dereference a non-dereferenceable iterator");
1154#endif
1155        return *__i;
1156    }
1157    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const _NOEXCEPT
1158    {
1159#if _LIBCPP_DEBUG_LEVEL >= 2
1160        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1161                       "Attempted to dereference a non-dereferenceable iterator");
1162#endif
1163        return (pointer)&reinterpret_cast<const volatile char&>(*__i);
1164    }
1165    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator++() _NOEXCEPT
1166    {
1167#if _LIBCPP_DEBUG_LEVEL >= 2
1168        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1169                       "Attempted to increment non-incrementable iterator");
1170#endif
1171        ++__i;
1172        return *this;
1173    }
1174    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator++(int) _NOEXCEPT
1175        {__wrap_iter __tmp(*this); ++(*this); return __tmp;}
1176    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator--() _NOEXCEPT
1177    {
1178#if _LIBCPP_DEBUG_LEVEL >= 2
1179        _LIBCPP_ASSERT(__get_const_db()->__decrementable(this),
1180                       "Attempted to decrement non-decrementable iterator");
1181#endif
1182        --__i;
1183        return *this;
1184    }
1185    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator--(int) _NOEXCEPT
1186        {__wrap_iter __tmp(*this); --(*this); return __tmp;}
1187    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator+ (difference_type __n) const _NOEXCEPT
1188        {__wrap_iter __w(*this); __w += __n; return __w;}
1189    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator+=(difference_type __n) _NOEXCEPT
1190    {
1191#if _LIBCPP_DEBUG_LEVEL >= 2
1192        _LIBCPP_ASSERT(__get_const_db()->__addable(this, __n),
1193                   "Attempted to add/subtract iterator outside of valid range");
1194#endif
1195        __i += __n;
1196        return *this;
1197    }
1198    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator- (difference_type __n) const _NOEXCEPT
1199        {return *this + (-__n);}
1200    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator-=(difference_type __n) _NOEXCEPT
1201        {*this += -__n; return *this;}
1202    _LIBCPP_INLINE_VISIBILITY reference        operator[](difference_type __n) const _NOEXCEPT
1203    {
1204#if _LIBCPP_DEBUG_LEVEL >= 2
1205        _LIBCPP_ASSERT(__get_const_db()->__subscriptable(this, __n),
1206                   "Attempted to subscript iterator outside of valid range");
1207#endif
1208        return __i[__n];
1209    }
1210
1211    _LIBCPP_INLINE_VISIBILITY iterator_type base() const _NOEXCEPT {return __i;}
1212
1213private:
1214#if _LIBCPP_DEBUG_LEVEL >= 2
1215    _LIBCPP_INLINE_VISIBILITY __wrap_iter(const void* __p, iterator_type __x) : __i(__x)
1216    {
1217        __get_db()->__insert_ic(this, __p);
1218    }
1219#else
1220    _LIBCPP_INLINE_VISIBILITY __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {}
1221#endif
1222
1223    template <class _Up> friend class __wrap_iter;
1224    template <class _CharT, class _Traits, class _Alloc> friend class basic_string;
1225    template <class _Tp, class _Alloc> friend class vector;
1226
1227    template <class _Iter1, class _Iter2>
1228    friend
1229    bool
1230    operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1231
1232    template <class _Iter1, class _Iter2>
1233    friend
1234    bool
1235    operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1236
1237    template <class _Iter1, class _Iter2>
1238    friend
1239    bool
1240    operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1241
1242    template <class _Iter1, class _Iter2>
1243    friend
1244    bool
1245    operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1246
1247    template <class _Iter1, class _Iter2>
1248    friend
1249    bool
1250    operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1251
1252    template <class _Iter1, class _Iter2>
1253    friend
1254    bool
1255    operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1256
1257    template <class _Iter1, class _Iter2>
1258    friend
1259    typename __wrap_iter<_Iter1>::difference_type
1260    operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1261
1262    template <class _Iter1>
1263    friend
1264    __wrap_iter<_Iter1>
1265    operator+(typename __wrap_iter<_Iter1>::difference_type, __wrap_iter<_Iter1>) _NOEXCEPT;
1266
1267    template <class _Ip, class _Op> friend _Op copy(_Ip, _Ip, _Op);
1268    template <class _B1, class _B2> friend _B2 copy_backward(_B1, _B1, _B2);
1269    template <class _Ip, class _Op> friend _Op move(_Ip, _Ip, _Op);
1270    template <class _B1, class _B2> friend _B2 move_backward(_B1, _B1, _B2);
1271
1272    template <class _Tp>
1273    friend
1274    typename enable_if
1275    <
1276        is_trivially_copy_assignable<_Tp>::value,
1277        _Tp*
1278    >::type
1279    __unwrap_iter(__wrap_iter<_Tp*>);
1280};
1281
1282template <class _Iter1, class _Iter2>
1283inline _LIBCPP_INLINE_VISIBILITY
1284bool
1285operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1286{
1287    return __x.base() == __y.base();
1288}
1289
1290template <class _Iter1, class _Iter2>
1291inline _LIBCPP_INLINE_VISIBILITY
1292bool
1293operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1294{
1295#if _LIBCPP_DEBUG_LEVEL >= 2
1296    _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1297                   "Attempted to compare incomparable iterators");
1298#endif
1299    return __x.base() < __y.base();
1300}
1301
1302template <class _Iter1, class _Iter2>
1303inline _LIBCPP_INLINE_VISIBILITY
1304bool
1305operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1306{
1307    return !(__x == __y);
1308}
1309
1310template <class _Iter1, class _Iter2>
1311inline _LIBCPP_INLINE_VISIBILITY
1312bool
1313operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1314{
1315    return __y < __x;
1316}
1317
1318template <class _Iter1, class _Iter2>
1319inline _LIBCPP_INLINE_VISIBILITY
1320bool
1321operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1322{
1323    return !(__x < __y);
1324}
1325
1326template <class _Iter1, class _Iter2>
1327inline _LIBCPP_INLINE_VISIBILITY
1328bool
1329operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1330{
1331    return !(__y < __x);
1332}
1333
1334template <class _Iter1>
1335inline _LIBCPP_INLINE_VISIBILITY
1336bool
1337operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1338{
1339    return !(__x == __y);
1340}
1341
1342template <class _Iter1>
1343inline _LIBCPP_INLINE_VISIBILITY
1344bool
1345operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1346{
1347    return __y < __x;
1348}
1349
1350template <class _Iter1>
1351inline _LIBCPP_INLINE_VISIBILITY
1352bool
1353operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1354{
1355    return !(__x < __y);
1356}
1357
1358template <class _Iter1>
1359inline _LIBCPP_INLINE_VISIBILITY
1360bool
1361operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1362{
1363    return !(__y < __x);
1364}
1365
1366template <class _Iter1, class _Iter2>
1367inline _LIBCPP_INLINE_VISIBILITY
1368typename __wrap_iter<_Iter1>::difference_type
1369operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1370{
1371#if _LIBCPP_DEBUG_LEVEL >= 2
1372    _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1373                   "Attempted to subtract incompatible iterators");
1374#endif
1375    return __x.base() - __y.base();
1376}
1377
1378template <class _Iter>
1379inline _LIBCPP_INLINE_VISIBILITY
1380__wrap_iter<_Iter>
1381operator+(typename __wrap_iter<_Iter>::difference_type __n,
1382          __wrap_iter<_Iter> __x) _NOEXCEPT
1383{
1384    __x += __n;
1385    return __x;
1386}
1387
1388template <class _Tp, size_t _Np>
1389inline _LIBCPP_INLINE_VISIBILITY
1390_Tp*
1391begin(_Tp (&__array)[_Np])
1392{
1393    return __array;
1394}
1395
1396template <class _Tp, size_t _Np>
1397inline _LIBCPP_INLINE_VISIBILITY
1398_Tp*
1399end(_Tp (&__array)[_Np])
1400{
1401    return __array + _Np;
1402}
1403
1404#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_TRAILING_RETURN)
1405
1406template <class _Cp>
1407inline _LIBCPP_INLINE_VISIBILITY
1408auto
1409begin(_Cp& __c) -> decltype(__c.begin())
1410{
1411    return __c.begin();
1412}
1413
1414template <class _Cp>
1415inline _LIBCPP_INLINE_VISIBILITY
1416auto
1417begin(const _Cp& __c) -> decltype(__c.begin())
1418{
1419    return __c.begin();
1420}
1421
1422template <class _Cp>
1423inline _LIBCPP_INLINE_VISIBILITY
1424auto
1425end(_Cp& __c) -> decltype(__c.end())
1426{
1427    return __c.end();
1428}
1429
1430template <class _Cp>
1431inline _LIBCPP_INLINE_VISIBILITY
1432auto
1433end(const _Cp& __c) -> decltype(__c.end())
1434{
1435    return __c.end();
1436}
1437
1438#if _LIBCPP_STD_VER > 11
1439
1440template <class _Tp, size_t _Np>
1441inline _LIBCPP_INLINE_VISIBILITY
1442reverse_iterator<_Tp*> rbegin(_Tp (&__array)[_Np])
1443{
1444    return reverse_iterator<_Tp*>(__array + _Np);
1445}
1446
1447template <class _Tp, size_t _Np>
1448inline _LIBCPP_INLINE_VISIBILITY
1449reverse_iterator<_Tp*> rend(_Tp (&__array)[_Np])
1450{
1451    return reverse_iterator<_Tp*>(__array);
1452}
1453
1454template <class _Ep>
1455inline _LIBCPP_INLINE_VISIBILITY
1456reverse_iterator<const _Ep*> rbegin(initializer_list<_Ep> __il)
1457{
1458    return reverse_iterator<const _Ep*>(__il.end());
1459}
1460
1461template <class _Ep>
1462inline _LIBCPP_INLINE_VISIBILITY
1463reverse_iterator<const _Ep*> rend(initializer_list<_Ep> __il)
1464{
1465    return reverse_iterator<const _Ep*>(__il.begin());
1466}
1467
1468template <class _Cp>
1469inline _LIBCPP_INLINE_VISIBILITY
1470auto cbegin(const _Cp& __c) -> decltype(begin(__c))
1471{
1472    return _VSTD::begin(__c);
1473}
1474
1475template <class _Cp>
1476inline _LIBCPP_INLINE_VISIBILITY
1477auto cend(const _Cp& __c) -> decltype(end(__c))
1478{
1479    return _VSTD::end(__c);
1480}
1481
1482template <class _Cp>
1483inline _LIBCPP_INLINE_VISIBILITY
1484auto rbegin(_Cp& __c) -> decltype(__c.rbegin())
1485{
1486    return __c.rbegin();
1487}
1488
1489template <class _Cp>
1490inline _LIBCPP_INLINE_VISIBILITY
1491auto rbegin(const _Cp& __c) -> decltype(__c.rbegin())
1492{
1493    return __c.rbegin();
1494}
1495
1496template <class _Cp>
1497inline _LIBCPP_INLINE_VISIBILITY
1498auto rend(_Cp& __c) -> decltype(__c.rend())
1499{
1500    return __c.rend();
1501}
1502
1503template <class _Cp>
1504inline _LIBCPP_INLINE_VISIBILITY
1505auto rend(const _Cp& __c) -> decltype(__c.rend())
1506{
1507    return __c.rend();
1508}
1509
1510template <class _Cp>
1511inline _LIBCPP_INLINE_VISIBILITY
1512auto crbegin(const _Cp& __c) -> decltype(rbegin(__c))
1513{
1514    return rbegin(__c);
1515}
1516
1517template <class _Cp>
1518inline _LIBCPP_INLINE_VISIBILITY
1519auto crend(const _Cp& __c) -> decltype(rend(__c))
1520{
1521    return rend(__c);
1522}
1523
1524#endif
1525
1526
1527#else  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_TRAILING_RETURN)
1528
1529template <class _Cp>
1530inline _LIBCPP_INLINE_VISIBILITY
1531typename _Cp::iterator
1532begin(_Cp& __c)
1533{
1534    return __c.begin();
1535}
1536
1537template <class _Cp>
1538inline _LIBCPP_INLINE_VISIBILITY
1539typename _Cp::const_iterator
1540begin(const _Cp& __c)
1541{
1542    return __c.begin();
1543}
1544
1545template <class _Cp>
1546inline _LIBCPP_INLINE_VISIBILITY
1547typename _Cp::iterator
1548end(_Cp& __c)
1549{
1550    return __c.end();
1551}
1552
1553template <class _Cp>
1554inline _LIBCPP_INLINE_VISIBILITY
1555typename _Cp::const_iterator
1556end(const _Cp& __c)
1557{
1558    return __c.end();
1559}
1560
1561#endif  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_TRAILING_RETURN)
1562
1563_LIBCPP_END_NAMESPACE_STD
1564
1565#endif  // _LIBCPP_ITERATOR
1566