1// -*- C++ -*-
2//===-------------------------- iterator ----------------------------------===//
3//
4//                     The LLVM Compiler Infrastructure
5//
6// This file is distributed under the University of Illinois Open Source
7// License. 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() throw();
267    istreambuf_iterator(istream_type& s) throw();
268    istreambuf_iterator(streambuf_type* s) throw();
269    istreambuf_iterator(a-private-type) throw();
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) throw();
297    ostreambuf_iterator(streambuf_type* s) throw();
298    ostreambuf_iterator& operator=(charT c);
299    ostreambuf_iterator& operator*();
300    ostreambuf_iterator& operator++();
301    ostreambuf_iterator& operator++(int);
302    bool failed() const throw();
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
312}  // std
313
314*/
315
316#include <__config>
317#include <type_traits>
318#include <cstddef>
319#include <iosfwd>
320#ifdef _LIBCPP_DEBUG
321#include <cassert>
322#endif
323
324#pragma GCC system_header
325
326_LIBCPP_BEGIN_NAMESPACE_STD
327
328struct _LIBCPP_VISIBLE input_iterator_tag {};
329struct _LIBCPP_VISIBLE output_iterator_tag {};
330struct _LIBCPP_VISIBLE forward_iterator_tag       : public input_iterator_tag {};
331struct _LIBCPP_VISIBLE bidirectional_iterator_tag : public forward_iterator_tag {};
332struct _LIBCPP_VISIBLE random_access_iterator_tag : public bidirectional_iterator_tag {};
333
334template <class _Tp>
335struct __has_iterator_category
336{
337private:
338    struct __two {char _; char __;};
339    template <class _Up> static __two __test(...);
340    template <class _Up> static char __test(typename _Up::iterator_category* = 0);
341public:
342    static const bool value = sizeof(__test<_Tp>(0)) == 1;
343};
344
345template <class _Iter, bool> struct ____iterator_traits {};
346
347template <class _Iter>
348struct ____iterator_traits<_Iter, true>
349{
350    typedef typename _Iter::difference_type   difference_type;
351    typedef typename _Iter::value_type        value_type;
352    typedef typename _Iter::pointer           pointer;
353    typedef typename _Iter::reference         reference;
354    typedef typename _Iter::iterator_category iterator_category;
355};
356
357template <class _Iter, bool> struct __iterator_traits {};
358
359template <class _Iter>
360struct __iterator_traits<_Iter, true>
361    :  ____iterator_traits
362      <
363        _Iter,
364        is_convertible<typename _Iter::iterator_category, input_iterator_tag>::value ||
365        is_convertible<typename _Iter::iterator_category, output_iterator_tag>::value
366      >
367{};
368
369// iterator_traits<Iterator> will only have the nested types if Iterator::iterator_category
370//    exists.  Else iterator_traits<Iterator> will be an empty class.  This is a
371//    conforming extension which allows some programs to compile and behave as
372//    the client expects instead of failing at compile time.
373
374template <class _Iter>
375struct _LIBCPP_VISIBLE iterator_traits
376    : __iterator_traits<_Iter, __has_iterator_category<_Iter>::value> {};
377
378template<class _Tp>
379struct _LIBCPP_VISIBLE iterator_traits<_Tp*>
380{
381    typedef ptrdiff_t difference_type;
382    typedef typename remove_const<_Tp>::type value_type;
383    typedef _Tp* pointer;
384    typedef _Tp& reference;
385    typedef random_access_iterator_tag iterator_category;
386};
387
388template <class _Tp, class _Up, bool = __has_iterator_category<iterator_traits<_Tp> >::value>
389struct __has_iterator_category_convertible_to
390    : public integral_constant<bool, is_convertible<typename iterator_traits<_Tp>::iterator_category, _Up>::value>
391{};
392
393template <class _Tp, class _Up>
394struct __has_iterator_category_convertible_to<_Tp, _Up, false> : public false_type {};
395
396template <class _Tp>
397struct __is_input_iterator : public __has_iterator_category_convertible_to<_Tp, input_iterator_tag> {};
398
399template <class _Tp>
400struct __is_forward_iterator : public __has_iterator_category_convertible_to<_Tp, forward_iterator_tag> {};
401
402template <class _Tp>
403struct __is_bidirectional_iterator : public __has_iterator_category_convertible_to<_Tp, bidirectional_iterator_tag> {};
404
405template <class _Tp>
406struct __is_random_access_iterator : public __has_iterator_category_convertible_to<_Tp, random_access_iterator_tag> {};
407
408template<class _Category, class _Tp, class _Distance = ptrdiff_t,
409         class _Pointer = _Tp*, class _Reference = _Tp&>
410struct _LIBCPP_VISIBLE iterator
411{
412    typedef _Tp        value_type;
413    typedef _Distance  difference_type;
414    typedef _Pointer   pointer;
415    typedef _Reference reference;
416    typedef _Category  iterator_category;
417};
418
419template <class _InputIter>
420inline _LIBCPP_INLINE_VISIBILITY
421void __advance(_InputIter& __i,
422             typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag)
423{
424    for (; __n > 0; --__n)
425        ++__i;
426}
427
428template <class _BiDirIter>
429inline _LIBCPP_INLINE_VISIBILITY
430void __advance(_BiDirIter& __i,
431             typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag)
432{
433    if (__n >= 0)
434        for (; __n > 0; --__n)
435            ++__i;
436    else
437        for (; __n < 0; ++__n)
438            --__i;
439}
440
441template <class _RandIter>
442inline _LIBCPP_INLINE_VISIBILITY
443void __advance(_RandIter& __i,
444             typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag)
445{
446   __i += __n;
447}
448
449template <class _InputIter>
450inline _LIBCPP_INLINE_VISIBILITY
451void advance(_InputIter& __i,
452             typename iterator_traits<_InputIter>::difference_type __n)
453{
454    __advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category());
455}
456
457template <class _InputIter>
458inline _LIBCPP_INLINE_VISIBILITY
459typename iterator_traits<_InputIter>::difference_type
460__distance(_InputIter __first, _InputIter __last, input_iterator_tag)
461{
462    typename iterator_traits<_InputIter>::difference_type __r(0);
463    for (; __first != __last; ++__first)
464        ++__r;
465    return __r;
466}
467
468template <class _RandIter>
469inline _LIBCPP_INLINE_VISIBILITY
470typename iterator_traits<_RandIter>::difference_type
471__distance(_RandIter __first, _RandIter __last, random_access_iterator_tag)
472{
473    return __last - __first;
474}
475
476template <class _InputIter>
477inline _LIBCPP_INLINE_VISIBILITY
478typename iterator_traits<_InputIter>::difference_type
479distance(_InputIter __first, _InputIter __last)
480{
481    return __distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category());
482}
483
484template <class _ForwardIter>
485inline _LIBCPP_INLINE_VISIBILITY
486_ForwardIter
487next(_ForwardIter __x,
488     typename iterator_traits<_ForwardIter>::difference_type __n = 1,
489     typename enable_if<__is_forward_iterator<_ForwardIter>::value>::type* = 0)
490{
491    advance(__x, __n);
492    return __x;
493}
494
495template <class _BidiretionalIter>
496inline _LIBCPP_INLINE_VISIBILITY
497_BidiretionalIter
498prev(_BidiretionalIter __x,
499     typename iterator_traits<_BidiretionalIter>::difference_type __n = 1,
500     typename enable_if<__is_bidirectional_iterator<_BidiretionalIter>::value>::type* = 0)
501{
502    advance(__x, -__n);
503    return __x;
504}
505
506template <class _Iter>
507class _LIBCPP_VISIBLE reverse_iterator
508    : public iterator<typename iterator_traits<_Iter>::iterator_category,
509                      typename iterator_traits<_Iter>::value_type,
510                      typename iterator_traits<_Iter>::difference_type,
511                      typename iterator_traits<_Iter>::pointer,
512                      typename iterator_traits<_Iter>::reference>
513{
514private:
515    mutable _Iter __t;
516protected:
517    _Iter current;
518public:
519    typedef _Iter                                            iterator_type;
520    typedef typename iterator_traits<_Iter>::difference_type difference_type;
521    typedef typename iterator_traits<_Iter>::reference       reference;
522    typedef typename iterator_traits<_Iter>::pointer         pointer;
523
524    _LIBCPP_INLINE_VISIBILITY reverse_iterator() : current() {}
525    _LIBCPP_INLINE_VISIBILITY explicit reverse_iterator(_Iter __x) : __t(__x), current(__x) {}
526    template <class _Up> _LIBCPP_INLINE_VISIBILITY reverse_iterator(const reverse_iterator<_Up>& __u)
527        : __t(__u.base()), current(__u.base()) {}
528    _LIBCPP_INLINE_VISIBILITY _Iter base() const {return current;}
529    _LIBCPP_INLINE_VISIBILITY reference operator*() const {__t = current; return *--__t;}
530    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const {return &(operator*());}
531    _LIBCPP_INLINE_VISIBILITY reverse_iterator& operator++() {--current; return *this;}
532    _LIBCPP_INLINE_VISIBILITY reverse_iterator  operator++(int)
533        {reverse_iterator __tmp(*this); --current; return __tmp;}
534    _LIBCPP_INLINE_VISIBILITY reverse_iterator& operator--() {++current; return *this;}
535    _LIBCPP_INLINE_VISIBILITY reverse_iterator  operator--(int)
536        {reverse_iterator __tmp(*this); ++current; return __tmp;}
537    _LIBCPP_INLINE_VISIBILITY reverse_iterator  operator+ (difference_type __n) const
538        {return reverse_iterator(current - __n);}
539    _LIBCPP_INLINE_VISIBILITY reverse_iterator& operator+=(difference_type __n)
540        {current -= __n; return *this;}
541    _LIBCPP_INLINE_VISIBILITY reverse_iterator  operator- (difference_type __n) const
542        {return reverse_iterator(current + __n);}
543    _LIBCPP_INLINE_VISIBILITY reverse_iterator& operator-=(difference_type __n)
544        {current += __n; return *this;}
545    _LIBCPP_INLINE_VISIBILITY reference         operator[](difference_type __n) const
546        {return current[-__n-1];}
547};
548
549template <class _Iter1, class _Iter2>
550inline _LIBCPP_INLINE_VISIBILITY
551bool
552operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
553{
554    return __x.base() == __y.base();
555}
556
557template <class _Iter1, class _Iter2>
558inline _LIBCPP_INLINE_VISIBILITY
559bool
560operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
561{
562    return __x.base() > __y.base();
563}
564
565template <class _Iter1, class _Iter2>
566inline _LIBCPP_INLINE_VISIBILITY
567bool
568operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
569{
570    return __x.base() != __y.base();
571}
572
573template <class _Iter1, class _Iter2>
574inline _LIBCPP_INLINE_VISIBILITY
575bool
576operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
577{
578    return __x.base() < __y.base();
579}
580
581template <class _Iter1, class _Iter2>
582inline _LIBCPP_INLINE_VISIBILITY
583bool
584operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
585{
586    return __x.base() <= __y.base();
587}
588
589template <class _Iter1, class _Iter2>
590inline _LIBCPP_INLINE_VISIBILITY
591bool
592operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
593{
594    return __x.base() >= __y.base();
595}
596
597template <class _Iter1, class _Iter2>
598inline _LIBCPP_INLINE_VISIBILITY
599typename reverse_iterator<_Iter1>::difference_type
600operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
601{
602    return __y.base() - __x.base();
603}
604
605template <class _Iter>
606inline _LIBCPP_INLINE_VISIBILITY
607reverse_iterator<_Iter>
608operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_iterator<_Iter>& __x)
609{
610    return reverse_iterator<_Iter>(__x.base() - __n);
611}
612
613template <class _Container>
614class _LIBCPP_VISIBLE back_insert_iterator
615    : public iterator<output_iterator_tag,
616                      void,
617                      void,
618                      void,
619                      back_insert_iterator<_Container>&>
620{
621protected:
622    _Container* container;
623public:
624    typedef _Container container_type;
625
626    _LIBCPP_INLINE_VISIBILITY explicit back_insert_iterator(_Container& __x) : container(&__x) {}
627    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(const typename _Container::value_type& __value)
628        {container->push_back(__value); return *this;}
629#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
630    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(typename _Container::value_type&& __value)
631        {container->push_back(_STD::move(__value)); return *this;}
632#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
633    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator*()     {return *this;}
634    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator++()    {return *this;}
635    _LIBCPP_INLINE_VISIBILITY back_insert_iterator  operator++(int) {return *this;}
636};
637
638template <class _Container>
639inline _LIBCPP_INLINE_VISIBILITY
640back_insert_iterator<_Container>
641back_inserter(_Container& __x)
642{
643    return back_insert_iterator<_Container>(__x);
644}
645
646template <class _Container>
647class _LIBCPP_VISIBLE front_insert_iterator
648    : public iterator<output_iterator_tag,
649                      void,
650                      void,
651                      void,
652                      front_insert_iterator<_Container>&>
653{
654protected:
655    _Container* container;
656public:
657    typedef _Container container_type;
658
659    _LIBCPP_INLINE_VISIBILITY explicit front_insert_iterator(_Container& __x) : container(&__x) {}
660    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(const typename _Container::value_type& __value)
661        {container->push_front(__value); return *this;}
662#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
663    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(typename _Container::value_type&& __value)
664        {container->push_front(_STD::move(__value)); return *this;}
665#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
666    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator*()     {return *this;}
667    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator++()    {return *this;}
668    _LIBCPP_INLINE_VISIBILITY front_insert_iterator  operator++(int) {return *this;}
669};
670
671template <class _Container>
672inline _LIBCPP_INLINE_VISIBILITY
673front_insert_iterator<_Container>
674front_inserter(_Container& __x)
675{
676    return front_insert_iterator<_Container>(__x);
677}
678
679template <class _Container>
680class _LIBCPP_VISIBLE insert_iterator
681    : public iterator<output_iterator_tag,
682                      void,
683                      void,
684                      void,
685                      insert_iterator<_Container>&>
686{
687protected:
688    _Container* container;
689    typename _Container::iterator iter;
690public:
691    typedef _Container container_type;
692
693    _LIBCPP_INLINE_VISIBILITY insert_iterator(_Container& __x, typename _Container::iterator __i)
694        : container(&__x), iter(__i) {}
695    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(const typename _Container::value_type& __value)
696        {iter = container->insert(iter, __value); ++iter; return *this;}
697#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
698    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(typename _Container::value_type&& __value)
699        {iter = container->insert(iter, _STD::move(__value)); ++iter; return *this;}
700#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
701    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator*()        {return *this;}
702    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++()       {return *this;}
703    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++(int)    {return *this;}
704};
705
706template <class _Container>
707inline _LIBCPP_INLINE_VISIBILITY
708insert_iterator<_Container>
709inserter(_Container& __x, typename _Container::iterator __i)
710{
711    return insert_iterator<_Container>(__x, __i);
712}
713
714template <class _Tp, class _CharT = char,
715          class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t>
716class _LIBCPP_VISIBLE istream_iterator
717    : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&>
718{
719public:
720    typedef _CharT char_type;
721    typedef _Traits traits_type;
722    typedef basic_istream<_CharT,_Traits> istream_type;
723private:
724    istream_type* __in_stream_;
725    _Tp __value_;
726public:
727    _LIBCPP_INLINE_VISIBILITY istream_iterator() : __in_stream_(0) {}
728    _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(&__s)
729        {
730            if (!(*__in_stream_ >> __value_))
731                __in_stream_ = 0;
732        }
733
734    _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;}
735    _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return &(operator*());}
736    _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++()
737        {
738            if (!(*__in_stream_ >> __value_))
739                __in_stream_ = 0;
740            return *this;
741        }
742    _LIBCPP_INLINE_VISIBILITY istream_iterator  operator++(int)
743        {istream_iterator __t(*this); ++(*this); return __t;}
744
745    friend _LIBCPP_INLINE_VISIBILITY
746    bool operator==(const istream_iterator& __x, const istream_iterator& __y)
747        {return __x.__in_stream_ == __y.__in_stream_;}
748
749    friend _LIBCPP_INLINE_VISIBILITY
750    bool operator!=(const istream_iterator& __x, const istream_iterator& __y)
751        {return !(__x == __y);}
752};
753
754template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT> >
755class _LIBCPP_VISIBLE ostream_iterator
756    : public iterator<output_iterator_tag, void, void, void, void>
757{
758public:
759    typedef _CharT char_type;
760    typedef _Traits traits_type;
761    typedef basic_ostream<_CharT,_Traits> ostream_type;
762private:
763    ostream_type* __out_stream_;
764    const char_type* __delim_;
765public:
766    _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s)
767        : __out_stream_(&__s), __delim_(0) {}
768    _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter)
769        : __out_stream_(&__s), __delim_(__delimiter) {}
770    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator=(const _Tp& __value)
771        {
772            *__out_stream_ << __value;
773            if (__delim_)
774                *__out_stream_ << __delim_;
775            return *this;
776        }
777
778    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator*()     {return *this;}
779    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++()    {return *this;}
780    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++(int) {return *this;}
781};
782
783template<class _CharT, class _Traits>
784class _LIBCPP_VISIBLE istreambuf_iterator
785    : public iterator<input_iterator_tag, _CharT,
786                      typename _Traits::off_type, _CharT*,
787                      _CharT>
788{
789public:
790    typedef _CharT                          char_type;
791    typedef _Traits                         traits_type;
792    typedef typename _Traits::int_type      int_type;
793    typedef basic_streambuf<_CharT,_Traits> streambuf_type;
794    typedef basic_istream<_CharT,_Traits>   istream_type;
795private:
796    streambuf_type* __sbuf_;
797
798    class __proxy
799    {
800        char_type __keep_;
801        streambuf_type* __sbuf_;
802        _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s)
803            : __keep_(__c), __sbuf_(__s) {}
804        friend class istreambuf_iterator;
805    public:
806        _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;}
807    };
808
809    _LIBCPP_INLINE_VISIBILITY
810    void __test_for_eof()
811    {
812        if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof()))
813            __sbuf_ = 0;
814    }
815public:
816    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator() throw() : __sbuf_(0) {}
817    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) throw()
818        : __sbuf_(__s.rdbuf()) {__test_for_eof();}
819    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) throw()
820        : __sbuf_(__s) {__test_for_eof();}
821    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) throw()
822        : __sbuf_(__p.__sbuf_) {}
823
824    _LIBCPP_INLINE_VISIBILITY _CharT     operator*() const {return __sbuf_->sgetc();}
825    _LIBCPP_INLINE_VISIBILITY char_type* operator->() const {return nullptr;}
826    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++()
827        {
828            if (traits_type::eq_int_type(__sbuf_->snextc(), traits_type::eof()))
829                __sbuf_ = 0;
830            return *this;
831        }
832    _LIBCPP_INLINE_VISIBILITY __proxy              operator++(int)
833        {
834            char_type __c = __sbuf_->sgetc();
835            ++(*this);
836            return __proxy(__c, __sbuf_);
837        }
838
839    _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const
840        {return (__sbuf_ == 0) == (__b.__sbuf_ == 0);}
841};
842
843template <class _CharT, class _Traits>
844inline _LIBCPP_INLINE_VISIBILITY
845bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a,
846                const istreambuf_iterator<_CharT,_Traits>& __b)
847                {return __a.equal(__b);}
848
849template <class _CharT, class _Traits>
850inline _LIBCPP_INLINE_VISIBILITY
851bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a,
852                const istreambuf_iterator<_CharT,_Traits>& __b)
853                {return !__a.equal(__b);}
854
855template <class _CharT, class _Traits>
856class _LIBCPP_VISIBLE ostreambuf_iterator
857    : public iterator<output_iterator_tag, void, void, void, void>
858{
859public:
860    typedef _CharT                          char_type;
861    typedef _Traits                         traits_type;
862    typedef basic_streambuf<_CharT,_Traits> streambuf_type;
863    typedef basic_ostream<_CharT,_Traits>   ostream_type;
864private:
865    streambuf_type* __sbuf_;
866public:
867    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) throw()
868        : __sbuf_(__s.rdbuf()) {}
869    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) throw()
870        : __sbuf_(__s) {}
871    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c)
872        {
873            if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof()))
874                __sbuf_ = 0;
875            return *this;
876        }
877    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*()     {return *this;}
878    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++()    {return *this;}
879    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;}
880    _LIBCPP_INLINE_VISIBILITY bool failed() const throw() {return __sbuf_ == 0;}
881};
882
883template <class _Iter>
884class _LIBCPP_VISIBLE move_iterator
885{
886private:
887    _Iter __i;
888public:
889    typedef _Iter                                            iterator_type;
890    typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
891    typedef typename iterator_traits<iterator_type>::value_type value_type;
892    typedef typename iterator_traits<iterator_type>::difference_type difference_type;
893    typedef typename iterator_traits<iterator_type>::pointer pointer;
894#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
895    typedef value_type&& reference;
896#else
897    typedef typename iterator_traits<iterator_type>::reference reference;
898#endif
899
900    _LIBCPP_INLINE_VISIBILITY move_iterator() : __i() {}
901    _LIBCPP_INLINE_VISIBILITY explicit move_iterator(_Iter __x) : __i(__x) {}
902    template <class _Up> _LIBCPP_INLINE_VISIBILITY move_iterator(const move_iterator<_Up>& __u)
903        : __i(__u.base()) {}
904    _LIBCPP_INLINE_VISIBILITY _Iter base() const {return __i;}
905    _LIBCPP_INLINE_VISIBILITY reference operator*() const {return *__i;}
906    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const {return &(operator*());}
907    _LIBCPP_INLINE_VISIBILITY move_iterator& operator++() {++__i; return *this;}
908    _LIBCPP_INLINE_VISIBILITY move_iterator  operator++(int)
909        {move_iterator __tmp(*this); ++__i; return __tmp;}
910    _LIBCPP_INLINE_VISIBILITY move_iterator& operator--() {--__i; return *this;}
911    _LIBCPP_INLINE_VISIBILITY move_iterator  operator--(int)
912        {move_iterator __tmp(*this); --__i; return __tmp;}
913    _LIBCPP_INLINE_VISIBILITY move_iterator  operator+ (difference_type __n) const
914        {return move_iterator(__i + __n);}
915    _LIBCPP_INLINE_VISIBILITY move_iterator& operator+=(difference_type __n)
916        {__i += __n; return *this;}
917    _LIBCPP_INLINE_VISIBILITY move_iterator  operator- (difference_type __n) const
918        {return move_iterator(__i - __n);}
919    _LIBCPP_INLINE_VISIBILITY move_iterator& operator-=(difference_type __n)
920        {__i -= __n; return *this;}
921    _LIBCPP_INLINE_VISIBILITY reference         operator[](difference_type __n) const
922        {return __i[__n];}
923};
924
925template <class _Iter1, class _Iter2>
926inline _LIBCPP_INLINE_VISIBILITY
927bool
928operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
929{
930    return __x.base() == __y.base();
931}
932
933template <class _Iter1, class _Iter2>
934inline _LIBCPP_INLINE_VISIBILITY
935bool
936operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
937{
938    return __x.base() < __y.base();
939}
940
941template <class _Iter1, class _Iter2>
942inline _LIBCPP_INLINE_VISIBILITY
943bool
944operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
945{
946    return __x.base() != __y.base();
947}
948
949template <class _Iter1, class _Iter2>
950inline _LIBCPP_INLINE_VISIBILITY
951bool
952operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
953{
954    return __x.base() > __y.base();
955}
956
957template <class _Iter1, class _Iter2>
958inline _LIBCPP_INLINE_VISIBILITY
959bool
960operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
961{
962    return __x.base() >= __y.base();
963}
964
965template <class _Iter1, class _Iter2>
966inline _LIBCPP_INLINE_VISIBILITY
967bool
968operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
969{
970    return __x.base() <= __y.base();
971}
972
973template <class _Iter1, class _Iter2>
974inline _LIBCPP_INLINE_VISIBILITY
975typename move_iterator<_Iter1>::difference_type
976operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
977{
978    return __x.base() - __y.base();
979}
980
981template <class _Iter>
982inline _LIBCPP_INLINE_VISIBILITY
983move_iterator<_Iter>
984operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x)
985{
986    return move_iterator<_Iter>(__x.base() + __n);
987}
988
989template <class _Iter>
990inline _LIBCPP_INLINE_VISIBILITY
991move_iterator<_Iter>
992make_move_iterator(const _Iter& __i)
993{
994    return move_iterator<_Iter>(__i);
995}
996
997// __wrap_iter
998
999template <class _Iter> class __wrap_iter;
1000
1001template <class _Iter1, class _Iter2>
1002bool
1003operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1004
1005template <class _Iter1, class _Iter2>
1006bool
1007operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1008
1009template <class _Iter1, class _Iter2>
1010bool
1011operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1012
1013template <class _Iter1, class _Iter2>
1014bool
1015operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1016
1017template <class _Iter1, class _Iter2>
1018bool
1019operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1020
1021template <class _Iter1, class _Iter2>
1022bool
1023operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1024
1025template <class _Iter1, class _Iter2>
1026typename __wrap_iter<_Iter1>::difference_type
1027operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1028
1029template <class _Iter>
1030__wrap_iter<_Iter>
1031operator+(typename __wrap_iter<_Iter>::difference_type, const __wrap_iter<_Iter>&);
1032
1033template <class _I, class _O> _O copy(_I, _I, _O);
1034template <class _B1, class _B2> _B2 copy_backward(_B1, _B1, _B2);
1035template <class _I, class _O> _O move(_I, _I, _O);
1036template <class _B1, class _B2> _B2 move_backward(_B1, _B1, _B2);
1037
1038template <class _Tp>
1039typename enable_if
1040<
1041    has_trivial_copy_assign<_Tp>::value,
1042    _Tp*
1043>::type
1044__unwrap_iter(__wrap_iter<_Tp*>);
1045
1046template <class _Iter>
1047class __wrap_iter
1048{
1049public:
1050    typedef _Iter                                                      iterator_type;
1051    typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
1052    typedef typename iterator_traits<iterator_type>::value_type        value_type;
1053    typedef typename iterator_traits<iterator_type>::difference_type   difference_type;
1054    typedef typename iterator_traits<iterator_type>::pointer           pointer;
1055    typedef typename iterator_traits<iterator_type>::reference         reference;
1056private:
1057    iterator_type __i;
1058public:
1059    _LIBCPP_INLINE_VISIBILITY __wrap_iter() {}
1060    template <class _Up> _LIBCPP_INLINE_VISIBILITY __wrap_iter(const __wrap_iter<_Up>& __u,
1061        typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = 0)
1062        : __i(__u.base()) {}
1063    _LIBCPP_INLINE_VISIBILITY reference operator*() const {return *__i;}
1064    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const {return &(operator*());}
1065    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator++() {++__i; return *this;}
1066    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator++(int)
1067        {__wrap_iter __tmp(*this); ++__i; return __tmp;}
1068    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator--() {--__i; return *this;}
1069    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator--(int)
1070        {__wrap_iter __tmp(*this); --__i; return __tmp;}
1071    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator+ (difference_type __n) const
1072        {return __wrap_iter(__i + __n);}
1073    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator+=(difference_type __n)
1074        {__i += __n; return *this;}
1075    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator- (difference_type __n) const
1076        {return __wrap_iter(__i - __n);}
1077    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator-=(difference_type __n)
1078        {__i -= __n; return *this;}
1079    _LIBCPP_INLINE_VISIBILITY reference        operator[](difference_type __n) const
1080        {return __i[__n];}
1081
1082    _LIBCPP_INLINE_VISIBILITY iterator_type base() const {return __i;}
1083
1084private:
1085    _LIBCPP_INLINE_VISIBILITY __wrap_iter(iterator_type __x) : __i(__x) {}
1086
1087    template <class _Up> friend class __wrap_iter;
1088    template <class _CharT, class _Traits, class _Alloc> friend class basic_string;
1089    template <class _Tp, class _Alloc> friend class vector;
1090
1091    template <class _Iter1, class _Iter2>
1092    friend
1093    bool
1094    operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1095
1096    template <class _Iter1, class _Iter2>
1097    friend
1098    bool
1099    operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1100
1101    template <class _Iter1, class _Iter2>
1102    friend
1103    bool
1104    operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1105
1106    template <class _Iter1, class _Iter2>
1107    friend
1108    bool
1109    operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1110
1111    template <class _Iter1, class _Iter2>
1112    friend
1113    bool
1114    operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1115
1116    template <class _Iter1, class _Iter2>
1117    friend
1118    bool
1119    operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1120
1121    template <class _Iter1, class _Iter2>
1122    friend
1123    typename __wrap_iter<_Iter1>::difference_type
1124    operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&);
1125
1126    template <class _Iter1>
1127    friend
1128    __wrap_iter<_Iter1>
1129    operator+(typename __wrap_iter<_Iter1>::difference_type, const __wrap_iter<_Iter1>&);
1130
1131    template <class _I, class _O> friend _O copy(_I, _I, _O);
1132    template <class _B1, class _B2> friend _B2 copy_backward(_B1, _B1, _B2);
1133    template <class _I, class _O> friend _O move(_I, _I, _O);
1134    template <class _B1, class _B2> friend _B2 move_backward(_B1, _B1, _B2);
1135
1136    template <class _Tp>
1137    friend
1138    typename enable_if
1139    <
1140        has_trivial_copy_assign<_Tp>::value,
1141        _Tp*
1142    >::type
1143    __unwrap_iter(__wrap_iter<_Tp*>);
1144};
1145
1146template <class _Iter1, class _Iter2>
1147inline _LIBCPP_INLINE_VISIBILITY
1148bool
1149operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y)
1150{
1151    return __x.base() == __y.base();
1152}
1153
1154template <class _Iter1, class _Iter2>
1155inline _LIBCPP_INLINE_VISIBILITY
1156bool
1157operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y)
1158{
1159    return __x.base() < __y.base();
1160}
1161
1162template <class _Iter1, class _Iter2>
1163inline _LIBCPP_INLINE_VISIBILITY
1164bool
1165operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y)
1166{
1167    return __x.base() != __y.base();
1168}
1169
1170template <class _Iter1, class _Iter2>
1171inline _LIBCPP_INLINE_VISIBILITY
1172bool
1173operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y)
1174{
1175    return __x.base() > __y.base();
1176}
1177
1178template <class _Iter1, class _Iter2>
1179inline _LIBCPP_INLINE_VISIBILITY
1180bool
1181operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y)
1182{
1183    return __x.base() >= __y.base();
1184}
1185
1186template <class _Iter1, class _Iter2>
1187inline _LIBCPP_INLINE_VISIBILITY
1188bool
1189operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y)
1190{
1191    return __x.base() <= __y.base();
1192}
1193
1194template <class _Iter1, class _Iter2>
1195inline _LIBCPP_INLINE_VISIBILITY
1196typename __wrap_iter<_Iter1>::difference_type
1197operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y)
1198{
1199    return __x.base() - __y.base();
1200}
1201
1202template <class _Iter>
1203inline _LIBCPP_INLINE_VISIBILITY
1204__wrap_iter<_Iter>
1205operator+(typename __wrap_iter<_Iter>::difference_type __n,
1206          const __wrap_iter<_Iter>& __x)
1207{
1208    return __wrap_iter<_Iter>(__x.base() + __n);
1209}
1210
1211#ifdef _LIBCPP_DEBUG
1212
1213// __debug_iter
1214
1215template <class _Container, class _Iter> class __debug_iter;
1216
1217template <class _Container, class _Iter1, class _Iter2>
1218bool
1219operator==(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
1220
1221template <class _Container, class _Iter1, class _Iter2>
1222bool
1223operator<(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
1224
1225template <class _Container, class _Iter1, class _Iter2>
1226bool
1227operator!=(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
1228
1229template <class _Container, class _Iter1, class _Iter2>
1230bool
1231operator>(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
1232
1233template <class _Container, class _Iter1, class _Iter2>
1234bool
1235operator>=(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
1236
1237template <class _Container, class _Iter1, class _Iter2>
1238bool
1239operator<=(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
1240
1241template <class _Container, class _Iter1, class _Iter2>
1242typename __debug_iter<_Container, _Iter1>::difference_type
1243operator-(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
1244
1245template <class _Container, class _Iter>
1246__debug_iter<_Container, _Iter>
1247operator+(typename __debug_iter<_Container, _Iter>::difference_type, const __debug_iter<_Container, _Iter>&);
1248
1249template <class _Container, class _Iter>
1250class __debug_iter
1251{
1252public:
1253    typedef _Iter                                                      iterator_type;
1254    typedef _Container                                                 __container_type;
1255    typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
1256    typedef typename iterator_traits<iterator_type>::value_type        value_type;
1257    typedef typename iterator_traits<iterator_type>::difference_type   difference_type;
1258    typedef typename iterator_traits<iterator_type>::pointer           pointer;
1259    typedef typename iterator_traits<iterator_type>::reference         reference;
1260private:
1261    iterator_type __i;
1262    __debug_iter* __next;
1263    __container_type* __cont;
1264
1265public:
1266    _LIBCPP_INLINE_VISIBILITY __debug_iter() : __next(0), __cont(0) {}
1267    _LIBCPP_INLINE_VISIBILITY __debug_iter(const __debug_iter& __x)
1268        : __i(__x.base()), __next(0), __cont(0) {__set_owner(__x.__cont);}
1269    __debug_iter& operator=(const __debug_iter& __x);
1270    template <class _Up> _LIBCPP_INLINE_VISIBILITY __debug_iter(const __debug_iter<_Container, _Up>& __u,
1271        typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = 0)
1272        : __i(__u.base()), __next(0), __cont(0) {__set_owner(__u.__cont);}
1273    _LIBCPP_INLINE_VISIBILITY ~__debug_iter() {__remove_owner();}
1274    _LIBCPP_INLINE_VISIBILITY reference operator*() const {assert(__is_deref()); return *__i;}
1275    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const {return &(operator*());}
1276    _LIBCPP_INLINE_VISIBILITY __debug_iter& operator++() {assert(__can_increment()); ++__i; return *this;}
1277    _LIBCPP_INLINE_VISIBILITY __debug_iter  operator++(int)
1278        {__debug_iter __tmp(*this); operator++(); return __tmp;}
1279    _LIBCPP_INLINE_VISIBILITY __debug_iter& operator--() {assert(__can_decrement()); --__i; return *this;}
1280    _LIBCPP_INLINE_VISIBILITY __debug_iter  operator--(int)
1281        {__debug_iter __tmp(*this); operator--(); return __tmp;}
1282    _LIBCPP_INLINE_VISIBILITY __debug_iter  operator+ (difference_type __n) const
1283        {__debug_iter __t(*this); __t += __n; return __t;}
1284    __debug_iter& operator+=(difference_type __n);
1285    _LIBCPP_INLINE_VISIBILITY __debug_iter  operator- (difference_type __n) const
1286        {__debug_iter __t(*this); __t -= __n; return __t;}
1287    _LIBCPP_INLINE_VISIBILITY __debug_iter& operator-=(difference_type __n)
1288        {*this += -__n; return *this;}
1289    _LIBCPP_INLINE_VISIBILITY reference        operator[](difference_type __n) const
1290        {return *(*this + __n);}
1291
1292private:
1293    _LIBCPP_INLINE_VISIBILITY __debug_iter(const __container_type* __c, iterator_type __x)
1294        : __i(__x), __next(0), __cont(0) {__set_owner(__c);}
1295    _LIBCPP_INLINE_VISIBILITY iterator_type base() const {return __i;}
1296
1297    void __set_owner(const __container_type* __c);
1298    void __remove_owner();
1299    static void __remove_all(__container_type* __c);
1300    static void swap(__container_type* __x, __container_type* __y);
1301
1302    _LIBCPP_INLINE_VISIBILITY bool __is_deref() const
1303        {return __is_deref(__is_random_access_iterator<iterator_type>());}
1304    bool __is_deref(false_type) const;
1305    bool __is_deref(true_type) const;
1306    _LIBCPP_INLINE_VISIBILITY bool __can_decrement() const
1307        {return __can_decrement(integral_constant<int, is_pointer<iterator_type>::value ? 2:
1308                                                       __is_random_access_iterator<iterator_type>::value ? 1 : 0>());}
1309    bool __can_decrement(integral_constant<int, 0>) const;
1310    bool __can_decrement(integral_constant<int, 1>) const;
1311    bool __can_decrement(integral_constant<int, 2>) const;
1312    _LIBCPP_INLINE_VISIBILITY bool __can_increment() const
1313        {return __can_increment(integral_constant<int, is_pointer<iterator_type>::value ? 2:
1314                                                       __is_random_access_iterator<iterator_type>::value ? 1 : 0>());}
1315    bool __can_increment(integral_constant<int, 0>) const;
1316    bool __can_increment(integral_constant<int, 1>) const;
1317    bool __can_increment(integral_constant<int, 2>) const;
1318
1319    _LIBCPP_INLINE_VISIBILITY bool __can_add(difference_type __n) const
1320        {return __can_add(__n, is_pointer<iterator_type>());}
1321    bool __can_add(difference_type __n, false_type) const;
1322    bool __can_add(difference_type __n, true_type) const;
1323
1324    template <class _Cp, class _Up> friend class __debug_iter;
1325    friend class _Container::__self;
1326
1327    template <class _Cp, class _Iter1, class _Iter2>
1328    friend
1329    bool
1330    operator==(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
1331
1332    template <class _Cp, class _Iter1, class _Iter2>
1333    friend
1334    bool
1335    operator<(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
1336
1337    template <class _Cp, class _Iter1, class _Iter2>
1338    friend
1339    bool
1340    operator!=(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
1341
1342    template <class _Cp, class _Iter1, class _Iter2>
1343    friend
1344    bool
1345    operator>(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
1346
1347    template <class _Cp, class _Iter1, class _Iter2>
1348    friend
1349    bool
1350    operator>=(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
1351
1352    template <class _Cp, class _Iter1, class _Iter2>
1353    friend
1354    bool
1355    operator<=(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
1356
1357    template <class _Cp, class _Iter1, class _Iter2>
1358    friend
1359    typename __debug_iter<_Cp, _Iter1>::difference_type
1360    operator-(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
1361
1362    template <class _Cp, class _Iter1>
1363    friend
1364    __debug_iter<_Cp, _Iter1>
1365    operator+(typename __debug_iter<_Cp, _Iter1>::difference_type, const __debug_iter<_Cp, _Iter1>&);
1366};
1367
1368template <class _Container, class _Iter>
1369__debug_iter<_Container, _Iter>&
1370__debug_iter<_Container, _Iter>::operator=(const __debug_iter& __x)
1371{
1372    if (this != &__x)
1373    {
1374        __remove_owner();
1375        __i = __x.__i;
1376        __set_owner(__x.__cont);
1377    }
1378    return *this;
1379}
1380
1381template <class _Container, class _Iter>
1382void
1383__debug_iter<_Container, _Iter>::__set_owner(const __container_type* __c)
1384{
1385    __cont = const_cast<__container_type*>(__c);
1386    __debug_iter*& __head = __cont->__get_iterator_list(this);
1387    __next = __head;
1388    __head = this;
1389}
1390
1391template <class _Container, class _Iter>
1392void
1393__debug_iter<_Container, _Iter>::__remove_owner()
1394{
1395    if (__cont)
1396    {
1397        __debug_iter*& __head = __cont->__get_iterator_list(this);
1398        if (__head == this)
1399            __head = __next;
1400        else
1401        {
1402            __debug_iter* __prev = __head;
1403            for (__debug_iter* __p = __head->__next; __p != this; __p = __p->__next)
1404                __prev = __p;
1405            __prev->__next = __next;
1406        }
1407        __cont = 0;
1408    }
1409}
1410
1411template <class _Container, class _Iter>
1412void
1413__debug_iter<_Container, _Iter>::__remove_all(__container_type* __c)
1414{
1415    __debug_iter*& __head = __c->__get_iterator_list((__debug_iter*)0);
1416    __debug_iter* __p = __head;
1417    __head = 0;
1418    while (__p)
1419    {
1420        __p->__cont = 0;
1421        __debug_iter* __n = __p->__next;
1422        __p->__next = 0;
1423        __p = __n;
1424    }
1425}
1426
1427template <class _Container, class _Iter>
1428void
1429__debug_iter<_Container, _Iter>::swap(__container_type* __x, __container_type* __y)
1430{
1431    __debug_iter*& __head_x = __x->__get_iterator_list((__debug_iter*)0);
1432    __debug_iter*& __head_y = __y->__get_iterator_list((__debug_iter*)0);
1433    __debug_iter* __p = __head_x;
1434    __head_x = __head_y;
1435    __head_y = __p;
1436    for (__p = __head_x; __p; __p = __p->__next)
1437        __p->__cont = __x;
1438    for (__p = __head_y; __p; __p = __p->__next)
1439        __p->__cont = __y;
1440}
1441
1442template <class _Container, class _Iter>
1443bool
1444__debug_iter<_Container, _Iter>::__is_deref(false_type) const
1445{
1446    if (__cont == 0)
1447        return false;
1448    return __i != __cont->end().base();
1449}
1450
1451template <class _Container, class _Iter>
1452bool
1453__debug_iter<_Container, _Iter>::__is_deref(true_type) const
1454{
1455    if (__cont == 0)
1456        return false;
1457    return __i < __cont->end().base();
1458}
1459
1460template <class _Container, class _Iter>
1461bool
1462__debug_iter<_Container, _Iter>::__can_decrement(integral_constant<int, 0>) const
1463{
1464    if (__cont == 0)
1465        return false;
1466    return __i != __cont->begin().base();
1467}
1468
1469template <class _Container, class _Iter>
1470bool
1471__debug_iter<_Container, _Iter>::__can_decrement(integral_constant<int, 1>) const
1472{
1473    if (__cont == 0)
1474        return false;
1475    iterator_type __b = __cont->begin().base();
1476    return __b < __i && __i <= __b + __cont->size();
1477}
1478
1479template <class _Container, class _Iter>
1480bool
1481__debug_iter<_Container, _Iter>::__can_decrement(integral_constant<int, 2>) const
1482{
1483    if (__cont == 0)
1484        return false;
1485    iterator_type __b = __cont->begin().base();
1486    return __b < __i && __i <= __b + __cont->size();
1487}
1488
1489template <class _Container, class _Iter>
1490bool
1491__debug_iter<_Container, _Iter>::__can_increment(integral_constant<int, 0>) const
1492{
1493    if (__cont == 0)
1494        return false;
1495    return __i != __cont->end().base();
1496}
1497
1498template <class _Container, class _Iter>
1499bool
1500__debug_iter<_Container, _Iter>::__can_increment(integral_constant<int, 1>) const
1501{
1502    if (__cont == 0)
1503        return false;
1504    iterator_type __b = __cont->begin().base();
1505    return __b <= __i && __i < __b + __cont->size();
1506}
1507
1508template <class _Container, class _Iter>
1509bool
1510__debug_iter<_Container, _Iter>::__can_increment(integral_constant<int, 2>) const
1511{
1512    if (__cont == 0)
1513        return false;
1514    iterator_type __b = __cont->begin().base();
1515    return __b <= __i && __i < __b + __cont->size();
1516}
1517
1518template <class _Container, class _Iter>
1519bool
1520__debug_iter<_Container, _Iter>::__can_add(difference_type __n, false_type) const
1521{
1522    if (__cont == 0)
1523        return false;
1524    iterator_type __b = __cont->begin().base();
1525    iterator_type __j = __i + __n;
1526    return __b <= __j && __j <= __b + __cont->size();
1527}
1528
1529template <class _Container, class _Iter>
1530bool
1531__debug_iter<_Container, _Iter>::__can_add(difference_type __n, true_type) const
1532{
1533    if (__cont == 0)
1534        return false;
1535    iterator_type __b = __cont->begin().base();
1536    iterator_type __j = __i + __n;
1537    return __b <= __j && __j <= __b + __cont->size();
1538}
1539
1540template <class _Container, class _Iter>
1541__debug_iter<_Container, _Iter>&
1542__debug_iter<_Container, _Iter>::operator+=(difference_type __n)
1543{
1544    assert(__can_add(__n));
1545    __i += __n;
1546    return *this;
1547}
1548
1549template <class _Container, class _Iter1, class _Iter2>
1550inline _LIBCPP_INLINE_VISIBILITY
1551bool
1552operator==(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
1553{
1554    assert(__x.__cont && __x.__cont == __y.__cont);
1555    return __x.base() == __y.base();
1556}
1557
1558template <class _Container, class _Iter1, class _Iter2>
1559inline _LIBCPP_INLINE_VISIBILITY
1560bool
1561operator!=(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
1562{
1563    return !(__x == __y);
1564}
1565
1566template <class _Container, class _Iter1, class _Iter2>
1567inline _LIBCPP_INLINE_VISIBILITY
1568bool
1569operator<(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
1570{
1571    assert(__x.__cont && __x.__cont == __y.__cont);
1572    return __x.base() < __y.base();
1573}
1574
1575template <class _Container, class _Iter1, class _Iter2>
1576inline _LIBCPP_INLINE_VISIBILITY
1577bool
1578operator>(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
1579{
1580    return __y < __x;
1581}
1582
1583template <class _Container, class _Iter1, class _Iter2>
1584inline _LIBCPP_INLINE_VISIBILITY
1585bool
1586operator>=(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
1587{
1588    return !(__x < __y);
1589}
1590
1591template <class _Container, class _Iter1, class _Iter2>
1592inline _LIBCPP_INLINE_VISIBILITY
1593bool
1594operator<=(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
1595{
1596    return !(__y < __x);
1597}
1598
1599template <class _Container, class _Iter1, class _Iter2>
1600inline _LIBCPP_INLINE_VISIBILITY
1601typename __debug_iter<_Container, _Iter1>::difference_type
1602operator-(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
1603{
1604    assert(__x.__cont && __x.__cont == __y.__cont);
1605    return __x.base() - __y.base();
1606}
1607
1608template <class _Container, class _Iter>
1609inline _LIBCPP_INLINE_VISIBILITY
1610__debug_iter<_Container, _Iter>
1611operator+(typename __debug_iter<_Container, _Iter>::difference_type __n,
1612          const __debug_iter<_Container, _Iter>& __x)
1613{
1614    return __x + __n;
1615}
1616
1617#endif  // _LIBCPP_DEBUG
1618
1619#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_DECLTYPE)
1620
1621template <class _C>
1622inline _LIBCPP_INLINE_VISIBILITY
1623auto
1624begin(_C& __c) -> decltype(__c.begin())
1625{
1626    return __c.begin();
1627}
1628
1629template <class _C>
1630inline _LIBCPP_INLINE_VISIBILITY
1631auto
1632begin(const _C& __c) -> decltype(__c.begin())
1633{
1634    return __c.begin();
1635}
1636
1637template <class _C>
1638inline _LIBCPP_INLINE_VISIBILITY
1639auto
1640end(_C& __c) -> decltype(__c.end())
1641{
1642    return __c.end();
1643}
1644
1645template <class _C>
1646inline _LIBCPP_INLINE_VISIBILITY
1647auto
1648end(const _C& __c) -> decltype(__c.end())
1649{
1650    return __c.end();
1651}
1652
1653#else  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_DECLTYPE)
1654
1655template <class _C>
1656inline _LIBCPP_INLINE_VISIBILITY
1657typename _C::iterator
1658begin(_C& __c)
1659{
1660    return __c.begin();
1661}
1662
1663template <class _C>
1664inline _LIBCPP_INLINE_VISIBILITY
1665typename _C::const_iterator
1666begin(const _C& __c)
1667{
1668    return __c.begin();
1669}
1670
1671template <class _C>
1672inline _LIBCPP_INLINE_VISIBILITY
1673typename _C::iterator
1674end(_C& __c)
1675{
1676    return __c.end();
1677}
1678
1679template <class _C>
1680inline _LIBCPP_INLINE_VISIBILITY
1681typename _C::const_iterator
1682end(const _C& __c)
1683{
1684    return __c.end();
1685}
1686
1687#endif  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_DECLTYPE)
1688
1689template <class _T, size_t _N>
1690inline _LIBCPP_INLINE_VISIBILITY
1691_T*
1692begin(_T (&__array)[_N])
1693{
1694    return __array;
1695}
1696
1697template <class _T, size_t _N>
1698inline _LIBCPP_INLINE_VISIBILITY
1699_T*
1700end(_T (&__array)[_N])
1701{
1702    return __array + _N;
1703}
1704
1705_LIBCPP_END_NAMESPACE_STD
1706
1707#endif  // _LIBCPP_ITERATOR
1708