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    constexpr reverse_iterator();
93    constexpr explicit reverse_iterator(Iterator x);
94    template <class U> constexpr reverse_iterator(const reverse_iterator<U>& u);
95    template <class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u);
96    constexpr Iterator base() const;
97    constexpr reference operator*() const;
98    constexpr pointer   operator->() const;
99    constexpr reverse_iterator& operator++();
100    constexpr reverse_iterator  operator++(int);
101    constexpr reverse_iterator& operator--();
102    constexpr reverse_iterator  operator--(int);
103    constexpr reverse_iterator  operator+ (difference_type n) const;
104    constexpr reverse_iterator& operator+=(difference_type n);
105    constexpr reverse_iterator  operator- (difference_type n) const;
106    constexpr reverse_iterator& operator-=(difference_type n);
107    constexpr reference         operator[](difference_type n) const;
108};
109
110template <class Iterator1, class Iterator2>
111constexpr bool                          // constexpr in C++17
112operator==(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
113
114template <class Iterator1, class Iterator2>
115constexpr bool                          // constexpr in C++17
116operator<(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
117
118template <class Iterator1, class Iterator2>
119constexpr bool                          // constexpr in C++17
120operator!=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
121
122template <class Iterator1, class Iterator2>
123constexpr bool                          // constexpr in C++17
124operator>(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
125
126template <class Iterator1, class Iterator2>
127constexpr bool                          // constexpr in C++17
128operator>=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
129
130template <class Iterator1, class Iterator2>
131constexpr bool                          // constexpr in C++17
132operator<=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
133
134template <class Iterator1, class Iterator2>
135constexpr auto
136operator-(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y)
137-> decltype(__y.base() - __x.base());   // constexpr in C++17
138
139template <class Iterator>
140constexpr reverse_iterator<Iterator>
141operator+(typename reverse_iterator<Iterator>::difference_type n,
142          const reverse_iterator<Iterator>& x);   // constexpr in C++17
143
144template <class Iterator>
145constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i); // C++14, constexpr in C++17
146
147template <class Container>
148class back_insert_iterator
149{
150protected:
151    Container* container;
152public:
153    typedef Container                   container_type;
154    typedef void                        value_type;
155    typedef void                        difference_type;
156    typedef void                        reference;
157    typedef void                        pointer;
158
159    explicit back_insert_iterator(Container& x);
160    back_insert_iterator& operator=(const typename Container::value_type& value);
161    back_insert_iterator& operator*();
162    back_insert_iterator& operator++();
163    back_insert_iterator  operator++(int);
164};
165
166template <class Container> back_insert_iterator<Container> back_inserter(Container& x);
167
168template <class Container>
169class front_insert_iterator
170{
171protected:
172    Container* container;
173public:
174    typedef Container                    container_type;
175    typedef void                         value_type;
176    typedef void                         difference_type;
177    typedef void                         reference;
178    typedef void                         pointer;
179
180    explicit front_insert_iterator(Container& x);
181    front_insert_iterator& operator=(const typename Container::value_type& value);
182    front_insert_iterator& operator*();
183    front_insert_iterator& operator++();
184    front_insert_iterator  operator++(int);
185};
186
187template <class Container> front_insert_iterator<Container> front_inserter(Container& x);
188
189template <class Container>
190class insert_iterator
191{
192protected:
193    Container* container;
194    typename Container::iterator iter;
195public:
196    typedef Container              container_type;
197    typedef void                   value_type;
198    typedef void                   difference_type;
199    typedef void                   reference;
200    typedef void                   pointer;
201
202    insert_iterator(Container& x, typename Container::iterator i);
203    insert_iterator& operator=(const typename Container::value_type& value);
204    insert_iterator& operator*();
205    insert_iterator& operator++();
206    insert_iterator& operator++(int);
207};
208
209template <class Container, class Iterator>
210insert_iterator<Container> inserter(Container& x, Iterator i);
211
212template <class Iterator>
213class move_iterator {
214public:
215    typedef Iterator                                              iterator_type;
216    typedef typename iterator_traits<Iterator>::difference_type   difference_type;
217    typedef Iterator                                              pointer;
218    typedef typename iterator_traits<Iterator>::value_type        value_type;
219    typedef typename iterator_traits<Iterator>::iterator_category iterator_category;
220    typedef value_type&&                                          reference;
221
222    constexpr move_iterator();  // all the constexprs are in C++17
223    constexpr explicit move_iterator(Iterator i);
224    template <class U>
225      constexpr move_iterator(const move_iterator<U>& u);
226    template <class U>
227      constexpr move_iterator& operator=(const move_iterator<U>& u);
228    constexpr iterator_type base() const;
229    constexpr reference operator*() const;
230    constexpr pointer operator->() const;
231    constexpr move_iterator& operator++();
232    constexpr move_iterator operator++(int);
233    constexpr move_iterator& operator--();
234    constexpr move_iterator operator--(int);
235    constexpr move_iterator operator+(difference_type n) const;
236    constexpr move_iterator& operator+=(difference_type n);
237    constexpr move_iterator operator-(difference_type n) const;
238    constexpr move_iterator& operator-=(difference_type n);
239    constexpr unspecified operator[](difference_type n) const;
240private:
241    Iterator current; // exposition only
242};
243
244template <class Iterator1, class Iterator2>
245constexpr bool   // constexpr in C++17
246operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
247
248template <class Iterator1, class Iterator2>
249constexpr bool   // constexpr in C++17
250operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
251
252template <class Iterator1, class Iterator2>
253constexpr bool   // constexpr in C++17
254operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
255
256template <class Iterator1, class Iterator2>
257constexpr bool   // constexpr in C++17
258operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
259
260template <class Iterator1, class Iterator2>
261constexpr bool   // constexpr in C++17
262operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
263
264template <class Iterator1, class Iterator2>
265constexpr bool   // constexpr in C++17
266operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
267
268template <class Iterator1, class Iterator2>
269constexpr auto   // constexpr in C++17
270operator-(const move_iterator<Iterator1>& x,
271          const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base());
272
273template <class Iterator>
274constexpr move_iterator<Iterator> operator+(   // constexpr in C++17
275            typename move_iterator<Iterator>::difference_type n,
276            const move_iterator<Iterator>& x);
277
278template <class Iterator>   // constexpr in C++17
279constexpr  move_iterator<Iterator> make_move_iterator(const Iterator& i);
280
281
282template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t>
283class istream_iterator
284    : public iterator<input_iterator_tag, T, Distance, const T*, const T&>
285{
286public:
287    typedef charT char_type;
288    typedef traits traits_type;
289    typedef basic_istream<charT,traits> istream_type;
290
291    constexpr istream_iterator();
292    istream_iterator(istream_type& s);
293    istream_iterator(const istream_iterator& x);
294    ~istream_iterator();
295
296    const T& operator*() const;
297    const T* operator->() const;
298    istream_iterator& operator++();
299    istream_iterator  operator++(int);
300};
301
302template <class T, class charT, class traits, class Distance>
303bool operator==(const istream_iterator<T,charT,traits,Distance>& x,
304                const istream_iterator<T,charT,traits,Distance>& y);
305template <class T, class charT, class traits, class Distance>
306bool operator!=(const istream_iterator<T,charT,traits,Distance>& x,
307                const istream_iterator<T,charT,traits,Distance>& y);
308
309template <class T, class charT = char, class traits = char_traits<charT> >
310class ostream_iterator
311    : public iterator<output_iterator_tag, void, void, void ,void>
312{
313public:
314    typedef charT char_type;
315    typedef traits traits_type;
316    typedef basic_ostream<charT,traits> ostream_type;
317
318    ostream_iterator(ostream_type& s);
319    ostream_iterator(ostream_type& s, const charT* delimiter);
320    ostream_iterator(const ostream_iterator& x);
321    ~ostream_iterator();
322    ostream_iterator& operator=(const T& value);
323
324    ostream_iterator& operator*();
325    ostream_iterator& operator++();
326    ostream_iterator& operator++(int);
327};
328
329template<class charT, class traits = char_traits<charT> >
330class istreambuf_iterator
331    : public iterator<input_iterator_tag, charT,
332                      typename traits::off_type, unspecified,
333                      charT>
334{
335public:
336    typedef charT                         char_type;
337    typedef traits                        traits_type;
338    typedef typename traits::int_type     int_type;
339    typedef basic_streambuf<charT,traits> streambuf_type;
340    typedef basic_istream<charT,traits>   istream_type;
341
342    istreambuf_iterator() noexcept;
343    istreambuf_iterator(istream_type& s) noexcept;
344    istreambuf_iterator(streambuf_type* s) noexcept;
345    istreambuf_iterator(a-private-type) noexcept;
346
347    charT                operator*() const;
348    pointer operator->() const;
349    istreambuf_iterator& operator++();
350    a-private-type       operator++(int);
351
352    bool equal(const istreambuf_iterator& b) const;
353};
354
355template <class charT, class traits>
356bool operator==(const istreambuf_iterator<charT,traits>& a,
357                const istreambuf_iterator<charT,traits>& b);
358template <class charT, class traits>
359bool operator!=(const istreambuf_iterator<charT,traits>& a,
360                const istreambuf_iterator<charT,traits>& b);
361
362template <class charT, class traits = char_traits<charT> >
363class ostreambuf_iterator
364    : public iterator<output_iterator_tag, void, void, void, void>
365{
366public:
367    typedef charT                         char_type;
368    typedef traits                        traits_type;
369    typedef basic_streambuf<charT,traits> streambuf_type;
370    typedef basic_ostream<charT,traits>   ostream_type;
371
372    ostreambuf_iterator(ostream_type& s) noexcept;
373    ostreambuf_iterator(streambuf_type* s) noexcept;
374    ostreambuf_iterator& operator=(charT c);
375    ostreambuf_iterator& operator*();
376    ostreambuf_iterator& operator++();
377    ostreambuf_iterator& operator++(int);
378    bool failed() const noexcept;
379};
380
381template <class C> auto begin(C& c) -> decltype(c.begin());
382template <class C> auto begin(const C& c) -> decltype(c.begin());
383template <class C> auto end(C& c) -> decltype(c.end());
384template <class C> auto end(const C& c) -> decltype(c.end());
385template <class T, size_t N> T* begin(T (&array)[N]);
386template <class T, size_t N> T* end(T (&array)[N]);
387
388template <class C> auto cbegin(const C& c) -> decltype(std::begin(c));        // C++14
389template <class C> auto cend(const C& c) -> decltype(std::end(c));            // C++14
390template <class C> auto rbegin(C& c) -> decltype(c.rbegin());                 // C++14
391template <class C> auto rbegin(const C& c) -> decltype(c.rbegin());           // C++14
392template <class C> auto rend(C& c) -> decltype(c.rend());                     // C++14
393template <class C> auto rend(const C& c) -> decltype(c.rend());               // C++14
394template <class E> reverse_iterator<const E*> rbegin(initializer_list<E> il); // C++14
395template <class E> reverse_iterator<const E*> rend(initializer_list<E> il);   // C++14
396template <class T, size_t N> reverse_iterator<T*> rbegin(T (&array)[N]);      // C++14
397template <class T, size_t N> reverse_iterator<T*> rend(T (&array)[N]);        // C++14
398template <class C> auto crbegin(const C& c) -> decltype(std::rbegin(c));      // C++14
399template <class C> auto crend(const C& c) -> decltype(std::rend(c));          // C++14
400
401// 24.8, container access:
402template <class C> constexpr auto size(const C& c) -> decltype(c.size());         // C++17
403template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17
404template <class C> constexpr auto empty(const C& c) -> decltype(c.empty());       // C++17
405template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept;  // C++17
406template <class E> constexpr bool empty(initializer_list<E> il) noexcept;         // C++17
407template <class C> constexpr auto data(C& c) -> decltype(c.data());               // C++17
408template <class C> constexpr auto data(const C& c) -> decltype(c.data());         // C++17
409template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept;           // C++17
410template <class E> constexpr const E* data(initializer_list<E> il) noexcept;      // C++17
411
412}  // std
413
414*/
415
416#include <__config>
417#include <iosfwd> // for forward declarations of vector and string.
418#include <__functional_base>
419#include <type_traits>
420#include <cstddef>
421#include <initializer_list>
422#ifdef __APPLE__
423#include <Availability.h>
424#endif
425
426#include <__debug>
427
428#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
429#pragma GCC system_header
430#endif
431
432_LIBCPP_BEGIN_NAMESPACE_STD
433
434struct _LIBCPP_TYPE_VIS_ONLY input_iterator_tag {};
435struct _LIBCPP_TYPE_VIS_ONLY output_iterator_tag {};
436struct _LIBCPP_TYPE_VIS_ONLY forward_iterator_tag       : public input_iterator_tag {};
437struct _LIBCPP_TYPE_VIS_ONLY bidirectional_iterator_tag : public forward_iterator_tag {};
438struct _LIBCPP_TYPE_VIS_ONLY random_access_iterator_tag : public bidirectional_iterator_tag {};
439
440template <class _Tp>
441struct __has_iterator_category
442{
443private:
444    struct __two {char __lx; char __lxx;};
445    template <class _Up> static __two __test(...);
446    template <class _Up> static char __test(typename _Up::iterator_category* = 0);
447public:
448    static const bool value = sizeof(__test<_Tp>(0)) == 1;
449};
450
451template <class _Iter, bool> struct __iterator_traits_impl {};
452
453template <class _Iter>
454struct __iterator_traits_impl<_Iter, true>
455{
456    typedef typename _Iter::difference_type   difference_type;
457    typedef typename _Iter::value_type        value_type;
458    typedef typename _Iter::pointer           pointer;
459    typedef typename _Iter::reference         reference;
460    typedef typename _Iter::iterator_category iterator_category;
461};
462
463template <class _Iter, bool> struct __iterator_traits {};
464
465template <class _Iter>
466struct __iterator_traits<_Iter, true>
467    :  __iterator_traits_impl
468      <
469        _Iter,
470        is_convertible<typename _Iter::iterator_category, input_iterator_tag>::value ||
471        is_convertible<typename _Iter::iterator_category, output_iterator_tag>::value
472      >
473{};
474
475// iterator_traits<Iterator> will only have the nested types if Iterator::iterator_category
476//    exists.  Else iterator_traits<Iterator> will be an empty class.  This is a
477//    conforming extension which allows some programs to compile and behave as
478//    the client expects instead of failing at compile time.
479
480template <class _Iter>
481struct _LIBCPP_TYPE_VIS_ONLY iterator_traits
482    : __iterator_traits<_Iter, __has_iterator_category<_Iter>::value> {};
483
484template<class _Tp>
485struct _LIBCPP_TYPE_VIS_ONLY iterator_traits<_Tp*>
486{
487    typedef ptrdiff_t difference_type;
488    typedef typename remove_const<_Tp>::type value_type;
489    typedef _Tp* pointer;
490    typedef _Tp& reference;
491    typedef random_access_iterator_tag iterator_category;
492};
493
494template <class _Tp, class _Up, bool = __has_iterator_category<iterator_traits<_Tp> >::value>
495struct __has_iterator_category_convertible_to
496    : public integral_constant<bool, is_convertible<typename iterator_traits<_Tp>::iterator_category, _Up>::value>
497{};
498
499template <class _Tp, class _Up>
500struct __has_iterator_category_convertible_to<_Tp, _Up, false> : public false_type {};
501
502template <class _Tp>
503struct __is_input_iterator : public __has_iterator_category_convertible_to<_Tp, input_iterator_tag> {};
504
505template <class _Tp>
506struct __is_forward_iterator : public __has_iterator_category_convertible_to<_Tp, forward_iterator_tag> {};
507
508template <class _Tp>
509struct __is_bidirectional_iterator : public __has_iterator_category_convertible_to<_Tp, bidirectional_iterator_tag> {};
510
511template <class _Tp>
512struct __is_random_access_iterator : public __has_iterator_category_convertible_to<_Tp, random_access_iterator_tag> {};
513
514template <class _Tp>
515struct __is_exactly_input_iterator
516    : public integral_constant<bool,
517         __has_iterator_category_convertible_to<_Tp, input_iterator_tag>::value &&
518        !__has_iterator_category_convertible_to<_Tp, forward_iterator_tag>::value> {};
519
520template<class _Category, class _Tp, class _Distance = ptrdiff_t,
521         class _Pointer = _Tp*, class _Reference = _Tp&>
522struct _LIBCPP_TYPE_VIS_ONLY iterator
523{
524    typedef _Tp        value_type;
525    typedef _Distance  difference_type;
526    typedef _Pointer   pointer;
527    typedef _Reference reference;
528    typedef _Category  iterator_category;
529};
530
531template <class _InputIter>
532inline _LIBCPP_INLINE_VISIBILITY
533void __advance(_InputIter& __i,
534             typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag)
535{
536    for (; __n > 0; --__n)
537        ++__i;
538}
539
540template <class _BiDirIter>
541inline _LIBCPP_INLINE_VISIBILITY
542void __advance(_BiDirIter& __i,
543             typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag)
544{
545    if (__n >= 0)
546        for (; __n > 0; --__n)
547            ++__i;
548    else
549        for (; __n < 0; ++__n)
550            --__i;
551}
552
553template <class _RandIter>
554inline _LIBCPP_INLINE_VISIBILITY
555void __advance(_RandIter& __i,
556             typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag)
557{
558   __i += __n;
559}
560
561template <class _InputIter>
562inline _LIBCPP_INLINE_VISIBILITY
563void advance(_InputIter& __i,
564             typename iterator_traits<_InputIter>::difference_type __n)
565{
566    __advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category());
567}
568
569template <class _InputIter>
570inline _LIBCPP_INLINE_VISIBILITY
571typename iterator_traits<_InputIter>::difference_type
572__distance(_InputIter __first, _InputIter __last, input_iterator_tag)
573{
574    typename iterator_traits<_InputIter>::difference_type __r(0);
575    for (; __first != __last; ++__first)
576        ++__r;
577    return __r;
578}
579
580template <class _RandIter>
581inline _LIBCPP_INLINE_VISIBILITY
582typename iterator_traits<_RandIter>::difference_type
583__distance(_RandIter __first, _RandIter __last, random_access_iterator_tag)
584{
585    return __last - __first;
586}
587
588template <class _InputIter>
589inline _LIBCPP_INLINE_VISIBILITY
590typename iterator_traits<_InputIter>::difference_type
591distance(_InputIter __first, _InputIter __last)
592{
593    return __distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category());
594}
595
596template <class _InputIter>
597inline _LIBCPP_INLINE_VISIBILITY
598_InputIter
599next(_InputIter __x,
600     typename iterator_traits<_InputIter>::difference_type __n = 1,
601     typename enable_if<__is_input_iterator<_InputIter>::value>::type* = 0)
602{
603    _VSTD::advance(__x, __n);
604    return __x;
605}
606
607template <class _BidiretionalIter>
608inline _LIBCPP_INLINE_VISIBILITY
609_BidiretionalIter
610prev(_BidiretionalIter __x,
611     typename iterator_traits<_BidiretionalIter>::difference_type __n = 1,
612     typename enable_if<__is_bidirectional_iterator<_BidiretionalIter>::value>::type* = 0)
613{
614    _VSTD::advance(__x, -__n);
615    return __x;
616}
617
618template <class _Iter>
619class _LIBCPP_TYPE_VIS_ONLY reverse_iterator
620    : public iterator<typename iterator_traits<_Iter>::iterator_category,
621                      typename iterator_traits<_Iter>::value_type,
622                      typename iterator_traits<_Iter>::difference_type,
623                      typename iterator_traits<_Iter>::pointer,
624                      typename iterator_traits<_Iter>::reference>
625{
626private:
627    /*mutable*/ _Iter __t;  // no longer used as of LWG #2360, not removed due to ABI break
628protected:
629    _Iter current;
630public:
631    typedef _Iter                                            iterator_type;
632    typedef typename iterator_traits<_Iter>::difference_type difference_type;
633    typedef typename iterator_traits<_Iter>::reference       reference;
634    typedef typename iterator_traits<_Iter>::pointer         pointer;
635
636    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
637    reverse_iterator() : __t(), current() {}
638    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
639    explicit reverse_iterator(_Iter __x) : __t(__x), current(__x) {}
640    template <class _Up>
641        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
642        reverse_iterator(const reverse_iterator<_Up>& __u) : __t(__u.base()), current(__u.base()) {}
643    template <class _Up>
644        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
645        reverse_iterator& operator=(const reverse_iterator<_Up>& __u)
646            { __t = current = __u.base(); return *this; }
647    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
648    _Iter base() const {return current;}
649    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
650    reference operator*() const {_Iter __tmp = current; return *--__tmp;}
651    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
652    pointer  operator->() const {return _VSTD::addressof(operator*());}
653    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
654    reverse_iterator& operator++() {--current; return *this;}
655    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
656    reverse_iterator  operator++(int) {reverse_iterator __tmp(*this); --current; return __tmp;}
657    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
658    reverse_iterator& operator--() {++current; return *this;}
659    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
660    reverse_iterator  operator--(int) {reverse_iterator __tmp(*this); ++current; return __tmp;}
661    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
662    reverse_iterator  operator+ (difference_type __n) const {return reverse_iterator(current - __n);}
663    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
664    reverse_iterator& operator+=(difference_type __n) {current -= __n; return *this;}
665    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
666    reverse_iterator  operator- (difference_type __n) const {return reverse_iterator(current + __n);}
667    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
668    reverse_iterator& operator-=(difference_type __n) {current += __n; return *this;}
669    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
670    reference         operator[](difference_type __n) const {return *(*this + __n);}
671};
672
673template <class _Iter1, class _Iter2>
674inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
675bool
676operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
677{
678    return __x.base() == __y.base();
679}
680
681template <class _Iter1, class _Iter2>
682inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
683bool
684operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
685{
686    return __x.base() > __y.base();
687}
688
689template <class _Iter1, class _Iter2>
690inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
691bool
692operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
693{
694    return __x.base() != __y.base();
695}
696
697template <class _Iter1, class _Iter2>
698inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
699bool
700operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
701{
702    return __x.base() < __y.base();
703}
704
705template <class _Iter1, class _Iter2>
706inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
707bool
708operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
709{
710    return __x.base() <= __y.base();
711}
712
713template <class _Iter1, class _Iter2>
714inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
715bool
716operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
717{
718    return __x.base() >= __y.base();
719}
720
721#ifndef _LIBCPP_CXX03_LANG
722template <class _Iter1, class _Iter2>
723inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
724auto
725operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
726-> decltype(__y.base() - __x.base())
727{
728    return __y.base() - __x.base();
729}
730#else
731template <class _Iter1, class _Iter2>
732inline _LIBCPP_INLINE_VISIBILITY
733typename reverse_iterator<_Iter1>::difference_type
734operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
735{
736    return __y.base() - __x.base();
737}
738#endif
739
740template <class _Iter>
741inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
742reverse_iterator<_Iter>
743operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_iterator<_Iter>& __x)
744{
745    return reverse_iterator<_Iter>(__x.base() - __n);
746}
747
748#if _LIBCPP_STD_VER > 11
749template <class _Iter>
750inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
751reverse_iterator<_Iter> make_reverse_iterator(_Iter __i)
752{
753    return reverse_iterator<_Iter>(__i);
754}
755#endif
756
757template <class _Container>
758class _LIBCPP_TYPE_VIS_ONLY back_insert_iterator
759    : public iterator<output_iterator_tag,
760                      void,
761                      void,
762                      void,
763                      void>
764{
765protected:
766    _Container* container;
767public:
768    typedef _Container container_type;
769
770    _LIBCPP_INLINE_VISIBILITY explicit back_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {}
771    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(const typename _Container::value_type& __value_)
772        {container->push_back(__value_); return *this;}
773#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
774    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(typename _Container::value_type&& __value_)
775        {container->push_back(_VSTD::move(__value_)); return *this;}
776#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
777    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator*()     {return *this;}
778    _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator++()    {return *this;}
779    _LIBCPP_INLINE_VISIBILITY back_insert_iterator  operator++(int) {return *this;}
780};
781
782template <class _Container>
783inline _LIBCPP_INLINE_VISIBILITY
784back_insert_iterator<_Container>
785back_inserter(_Container& __x)
786{
787    return back_insert_iterator<_Container>(__x);
788}
789
790template <class _Container>
791class _LIBCPP_TYPE_VIS_ONLY front_insert_iterator
792    : public iterator<output_iterator_tag,
793                      void,
794                      void,
795                      void,
796                      void>
797{
798protected:
799    _Container* container;
800public:
801    typedef _Container container_type;
802
803    _LIBCPP_INLINE_VISIBILITY explicit front_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {}
804    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(const typename _Container::value_type& __value_)
805        {container->push_front(__value_); return *this;}
806#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
807    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(typename _Container::value_type&& __value_)
808        {container->push_front(_VSTD::move(__value_)); return *this;}
809#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
810    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator*()     {return *this;}
811    _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator++()    {return *this;}
812    _LIBCPP_INLINE_VISIBILITY front_insert_iterator  operator++(int) {return *this;}
813};
814
815template <class _Container>
816inline _LIBCPP_INLINE_VISIBILITY
817front_insert_iterator<_Container>
818front_inserter(_Container& __x)
819{
820    return front_insert_iterator<_Container>(__x);
821}
822
823template <class _Container>
824class _LIBCPP_TYPE_VIS_ONLY insert_iterator
825    : public iterator<output_iterator_tag,
826                      void,
827                      void,
828                      void,
829                      void>
830{
831protected:
832    _Container* container;
833    typename _Container::iterator iter;
834public:
835    typedef _Container container_type;
836
837    _LIBCPP_INLINE_VISIBILITY insert_iterator(_Container& __x, typename _Container::iterator __i)
838        : container(_VSTD::addressof(__x)), iter(__i) {}
839    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(const typename _Container::value_type& __value_)
840        {iter = container->insert(iter, __value_); ++iter; return *this;}
841#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
842    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(typename _Container::value_type&& __value_)
843        {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;}
844#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
845    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator*()        {return *this;}
846    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++()       {return *this;}
847    _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++(int)    {return *this;}
848};
849
850template <class _Container>
851inline _LIBCPP_INLINE_VISIBILITY
852insert_iterator<_Container>
853inserter(_Container& __x, typename _Container::iterator __i)
854{
855    return insert_iterator<_Container>(__x, __i);
856}
857
858template <class _Tp, class _CharT = char,
859          class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t>
860class _LIBCPP_TYPE_VIS_ONLY istream_iterator
861    : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&>
862{
863public:
864    typedef _CharT char_type;
865    typedef _Traits traits_type;
866    typedef basic_istream<_CharT,_Traits> istream_type;
867private:
868    istream_type* __in_stream_;
869    _Tp __value_;
870public:
871    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(0), __value_() {}
872    _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s))
873        {
874            if (!(*__in_stream_ >> __value_))
875                __in_stream_ = 0;
876        }
877
878    _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;}
879    _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));}
880    _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++()
881        {
882            if (!(*__in_stream_ >> __value_))
883                __in_stream_ = 0;
884            return *this;
885        }
886    _LIBCPP_INLINE_VISIBILITY istream_iterator  operator++(int)
887        {istream_iterator __t(*this); ++(*this); return __t;}
888
889    friend _LIBCPP_INLINE_VISIBILITY
890    bool operator==(const istream_iterator& __x, const istream_iterator& __y)
891        {return __x.__in_stream_ == __y.__in_stream_;}
892
893    friend _LIBCPP_INLINE_VISIBILITY
894    bool operator!=(const istream_iterator& __x, const istream_iterator& __y)
895        {return !(__x == __y);}
896};
897
898template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT> >
899class _LIBCPP_TYPE_VIS_ONLY ostream_iterator
900    : public iterator<output_iterator_tag, void, void, void, void>
901{
902public:
903    typedef _CharT char_type;
904    typedef _Traits traits_type;
905    typedef basic_ostream<_CharT,_Traits> ostream_type;
906private:
907    ostream_type* __out_stream_;
908    const char_type* __delim_;
909public:
910    _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s) _NOEXCEPT
911        : __out_stream_(_VSTD::addressof(__s)), __delim_(0) {}
912    _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter) _NOEXCEPT
913        : __out_stream_(_VSTD::addressof(__s)), __delim_(__delimiter) {}
914    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator=(const _Tp& __value_)
915        {
916            *__out_stream_ << __value_;
917            if (__delim_)
918                *__out_stream_ << __delim_;
919            return *this;
920        }
921
922    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator*()     {return *this;}
923    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++()    {return *this;}
924    _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++(int) {return *this;}
925};
926
927template<class _CharT, class _Traits>
928class _LIBCPP_TYPE_VIS_ONLY istreambuf_iterator
929    : public iterator<input_iterator_tag, _CharT,
930                      typename _Traits::off_type, _CharT*,
931                      _CharT>
932{
933public:
934    typedef _CharT                          char_type;
935    typedef _Traits                         traits_type;
936    typedef typename _Traits::int_type      int_type;
937    typedef basic_streambuf<_CharT,_Traits> streambuf_type;
938    typedef basic_istream<_CharT,_Traits>   istream_type;
939private:
940    mutable streambuf_type* __sbuf_;
941
942    class __proxy
943    {
944        char_type __keep_;
945        streambuf_type* __sbuf_;
946        _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s)
947            : __keep_(__c), __sbuf_(__s) {}
948        friend class istreambuf_iterator;
949    public:
950        _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;}
951    };
952
953    _LIBCPP_INLINE_VISIBILITY
954    bool __test_for_eof() const
955    {
956        if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof()))
957            __sbuf_ = 0;
958        return __sbuf_ == 0;
959    }
960public:
961    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(0) {}
962    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT
963        : __sbuf_(__s.rdbuf()) {}
964    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT
965        : __sbuf_(__s) {}
966    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT
967        : __sbuf_(__p.__sbuf_) {}
968
969    _LIBCPP_INLINE_VISIBILITY char_type  operator*() const
970        {return static_cast<char_type>(__sbuf_->sgetc());}
971    _LIBCPP_INLINE_VISIBILITY char_type* operator->() const {return nullptr;}
972    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++()
973        {
974            __sbuf_->sbumpc();
975            return *this;
976        }
977    _LIBCPP_INLINE_VISIBILITY __proxy              operator++(int)
978        {
979            return __proxy(__sbuf_->sbumpc(), __sbuf_);
980        }
981
982    _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const
983        {return __test_for_eof() == __b.__test_for_eof();}
984};
985
986template <class _CharT, class _Traits>
987inline _LIBCPP_INLINE_VISIBILITY
988bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a,
989                const istreambuf_iterator<_CharT,_Traits>& __b)
990                {return __a.equal(__b);}
991
992template <class _CharT, class _Traits>
993inline _LIBCPP_INLINE_VISIBILITY
994bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a,
995                const istreambuf_iterator<_CharT,_Traits>& __b)
996                {return !__a.equal(__b);}
997
998template <class _CharT, class _Traits>
999class _LIBCPP_TYPE_VIS_ONLY ostreambuf_iterator
1000    : public iterator<output_iterator_tag, void, void, void, void>
1001{
1002public:
1003    typedef _CharT                          char_type;
1004    typedef _Traits                         traits_type;
1005    typedef basic_streambuf<_CharT,_Traits> streambuf_type;
1006    typedef basic_ostream<_CharT,_Traits>   ostream_type;
1007private:
1008    streambuf_type* __sbuf_;
1009public:
1010    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) _NOEXCEPT
1011        : __sbuf_(__s.rdbuf()) {}
1012    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT
1013        : __sbuf_(__s) {}
1014    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c)
1015        {
1016            if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof()))
1017                __sbuf_ = 0;
1018            return *this;
1019        }
1020    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*()     {return *this;}
1021    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++()    {return *this;}
1022    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;}
1023    _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == 0;}
1024
1025#if !defined(__APPLE__) || \
1026    (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED > __MAC_10_8) || \
1027    (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED > __IPHONE_6_0)
1028
1029    template <class _Ch, class _Tr>
1030    friend
1031    _LIBCPP_HIDDEN
1032    ostreambuf_iterator<_Ch, _Tr>
1033    __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s,
1034                     const _Ch* __ob, const _Ch* __op, const _Ch* __oe,
1035                     ios_base& __iob, _Ch __fl);
1036#endif
1037};
1038
1039template <class _Iter>
1040class _LIBCPP_TYPE_VIS_ONLY move_iterator
1041{
1042private:
1043    _Iter __i;
1044public:
1045    typedef _Iter                                            iterator_type;
1046    typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
1047    typedef typename iterator_traits<iterator_type>::value_type value_type;
1048    typedef typename iterator_traits<iterator_type>::difference_type difference_type;
1049    typedef iterator_type pointer;
1050#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1051    typedef typename iterator_traits<iterator_type>::reference __reference;
1052    typedef typename conditional<
1053            is_reference<__reference>::value,
1054            typename remove_reference<__reference>::type&&,
1055            __reference
1056        >::type reference;
1057#else
1058    typedef typename iterator_traits<iterator_type>::reference reference;
1059#endif
1060
1061    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1062    move_iterator() : __i() {}
1063    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1064    explicit move_iterator(_Iter __x) : __i(__x) {}
1065    template <class _Up>
1066      _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1067      move_iterator(const move_iterator<_Up>& __u) : __i(__u.base()) {}
1068    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 _Iter base() const {return __i;}
1069    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1070    reference operator*() const { return static_cast<reference>(*__i); }
1071    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1072    pointer  operator->() const { return __i;}
1073    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1074    move_iterator& operator++() {++__i; return *this;}
1075    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1076    move_iterator  operator++(int) {move_iterator __tmp(*this); ++__i; return __tmp;}
1077    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1078    move_iterator& operator--() {--__i; return *this;}
1079    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1080    move_iterator  operator--(int) {move_iterator __tmp(*this); --__i; return __tmp;}
1081    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1082    move_iterator  operator+ (difference_type __n) const {return move_iterator(__i + __n);}
1083    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1084    move_iterator& operator+=(difference_type __n) {__i += __n; return *this;}
1085    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1086    move_iterator  operator- (difference_type __n) const {return move_iterator(__i - __n);}
1087    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1088    move_iterator& operator-=(difference_type __n) {__i -= __n; return *this;}
1089    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1090    reference operator[](difference_type __n) const { return static_cast<reference>(__i[__n]); }
1091};
1092
1093template <class _Iter1, class _Iter2>
1094inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1095bool
1096operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1097{
1098    return __x.base() == __y.base();
1099}
1100
1101template <class _Iter1, class _Iter2>
1102inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1103bool
1104operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1105{
1106    return __x.base() < __y.base();
1107}
1108
1109template <class _Iter1, class _Iter2>
1110inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1111bool
1112operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1113{
1114    return __x.base() != __y.base();
1115}
1116
1117template <class _Iter1, class _Iter2>
1118inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1119bool
1120operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1121{
1122    return __x.base() > __y.base();
1123}
1124
1125template <class _Iter1, class _Iter2>
1126inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1127bool
1128operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1129{
1130    return __x.base() >= __y.base();
1131}
1132
1133template <class _Iter1, class _Iter2>
1134inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1135bool
1136operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1137{
1138    return __x.base() <= __y.base();
1139}
1140
1141#ifndef _LIBCPP_CXX03_LANG
1142template <class _Iter1, class _Iter2>
1143inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1144auto
1145operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1146-> decltype(__x.base() - __y.base())
1147{
1148    return __x.base() - __y.base();
1149}
1150#else
1151template <class _Iter1, class _Iter2>
1152inline _LIBCPP_INLINE_VISIBILITY
1153typename move_iterator<_Iter1>::difference_type
1154operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1155{
1156    return __x.base() - __y.base();
1157}
1158#endif
1159
1160template <class _Iter>
1161inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1162move_iterator<_Iter>
1163operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x)
1164{
1165    return move_iterator<_Iter>(__x.base() + __n);
1166}
1167
1168template <class _Iter>
1169inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1170move_iterator<_Iter>
1171make_move_iterator(_Iter __i)
1172{
1173    return move_iterator<_Iter>(__i);
1174}
1175
1176// __wrap_iter
1177
1178template <class _Iter> class __wrap_iter;
1179
1180template <class _Iter1, class _Iter2>
1181_LIBCPP_INLINE_VISIBILITY
1182bool
1183operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1184
1185template <class _Iter1, class _Iter2>
1186_LIBCPP_INLINE_VISIBILITY
1187bool
1188operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1189
1190template <class _Iter1, class _Iter2>
1191_LIBCPP_INLINE_VISIBILITY
1192bool
1193operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1194
1195template <class _Iter1, class _Iter2>
1196_LIBCPP_INLINE_VISIBILITY
1197bool
1198operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1199
1200template <class _Iter1, class _Iter2>
1201_LIBCPP_INLINE_VISIBILITY
1202bool
1203operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1204
1205template <class _Iter1, class _Iter2>
1206_LIBCPP_INLINE_VISIBILITY
1207bool
1208operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1209
1210#ifndef _LIBCPP_CXX03_LANG
1211template <class _Iter1, class _Iter2>
1212_LIBCPP_INLINE_VISIBILITY
1213auto
1214operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1215-> decltype(__x.base() - __y.base());
1216#else
1217template <class _Iter1, class _Iter2>
1218_LIBCPP_INLINE_VISIBILITY
1219typename __wrap_iter<_Iter1>::difference_type
1220operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1221#endif
1222
1223template <class _Iter>
1224_LIBCPP_INLINE_VISIBILITY
1225__wrap_iter<_Iter>
1226operator+(typename __wrap_iter<_Iter>::difference_type, __wrap_iter<_Iter>) _NOEXCEPT;
1227
1228template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY copy(_Ip, _Ip, _Op);
1229template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY copy_backward(_B1, _B1, _B2);
1230template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY move(_Ip, _Ip, _Op);
1231template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY move_backward(_B1, _B1, _B2);
1232
1233template <class _Tp>
1234_LIBCPP_INLINE_VISIBILITY
1235typename enable_if
1236<
1237    is_trivially_copy_assignable<_Tp>::value,
1238    _Tp*
1239>::type
1240__unwrap_iter(__wrap_iter<_Tp*>);
1241
1242template <class _Iter>
1243class __wrap_iter
1244{
1245public:
1246    typedef _Iter                                                      iterator_type;
1247    typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
1248    typedef typename iterator_traits<iterator_type>::value_type        value_type;
1249    typedef typename iterator_traits<iterator_type>::difference_type   difference_type;
1250    typedef typename iterator_traits<iterator_type>::pointer           pointer;
1251    typedef typename iterator_traits<iterator_type>::reference         reference;
1252private:
1253    iterator_type __i;
1254public:
1255    _LIBCPP_INLINE_VISIBILITY __wrap_iter() _NOEXCEPT
1256#if _LIBCPP_STD_VER > 11
1257                : __i{}
1258#endif
1259    {
1260#if _LIBCPP_DEBUG_LEVEL >= 2
1261        __get_db()->__insert_i(this);
1262#endif
1263    }
1264    template <class _Up> _LIBCPP_INLINE_VISIBILITY __wrap_iter(const __wrap_iter<_Up>& __u,
1265        typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = 0) _NOEXCEPT
1266        : __i(__u.base())
1267    {
1268#if _LIBCPP_DEBUG_LEVEL >= 2
1269        __get_db()->__iterator_copy(this, &__u);
1270#endif
1271    }
1272#if _LIBCPP_DEBUG_LEVEL >= 2
1273    _LIBCPP_INLINE_VISIBILITY
1274    __wrap_iter(const __wrap_iter& __x)
1275        : __i(__x.base())
1276    {
1277        __get_db()->__iterator_copy(this, &__x);
1278    }
1279    _LIBCPP_INLINE_VISIBILITY
1280    __wrap_iter& operator=(const __wrap_iter& __x)
1281    {
1282        if (this != &__x)
1283        {
1284            __get_db()->__iterator_copy(this, &__x);
1285            __i = __x.__i;
1286        }
1287        return *this;
1288    }
1289    _LIBCPP_INLINE_VISIBILITY
1290    ~__wrap_iter()
1291    {
1292        __get_db()->__erase_i(this);
1293    }
1294#endif
1295    _LIBCPP_INLINE_VISIBILITY reference operator*() const _NOEXCEPT
1296    {
1297#if _LIBCPP_DEBUG_LEVEL >= 2
1298        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1299                       "Attempted to dereference a non-dereferenceable iterator");
1300#endif
1301        return *__i;
1302    }
1303    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const _NOEXCEPT
1304    {
1305#if _LIBCPP_DEBUG_LEVEL >= 2
1306        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1307                       "Attempted to dereference a non-dereferenceable iterator");
1308#endif
1309        return (pointer)_VSTD::addressof(*__i);
1310    }
1311    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator++() _NOEXCEPT
1312    {
1313#if _LIBCPP_DEBUG_LEVEL >= 2
1314        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1315                       "Attempted to increment non-incrementable iterator");
1316#endif
1317        ++__i;
1318        return *this;
1319    }
1320    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator++(int) _NOEXCEPT
1321        {__wrap_iter __tmp(*this); ++(*this); return __tmp;}
1322    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator--() _NOEXCEPT
1323    {
1324#if _LIBCPP_DEBUG_LEVEL >= 2
1325        _LIBCPP_ASSERT(__get_const_db()->__decrementable(this),
1326                       "Attempted to decrement non-decrementable iterator");
1327#endif
1328        --__i;
1329        return *this;
1330    }
1331    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator--(int) _NOEXCEPT
1332        {__wrap_iter __tmp(*this); --(*this); return __tmp;}
1333    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator+ (difference_type __n) const _NOEXCEPT
1334        {__wrap_iter __w(*this); __w += __n; return __w;}
1335    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator+=(difference_type __n) _NOEXCEPT
1336    {
1337#if _LIBCPP_DEBUG_LEVEL >= 2
1338        _LIBCPP_ASSERT(__get_const_db()->__addable(this, __n),
1339                   "Attempted to add/subtract iterator outside of valid range");
1340#endif
1341        __i += __n;
1342        return *this;
1343    }
1344    _LIBCPP_INLINE_VISIBILITY __wrap_iter  operator- (difference_type __n) const _NOEXCEPT
1345        {return *this + (-__n);}
1346    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator-=(difference_type __n) _NOEXCEPT
1347        {*this += -__n; return *this;}
1348    _LIBCPP_INLINE_VISIBILITY reference        operator[](difference_type __n) const _NOEXCEPT
1349    {
1350#if _LIBCPP_DEBUG_LEVEL >= 2
1351        _LIBCPP_ASSERT(__get_const_db()->__subscriptable(this, __n),
1352                   "Attempted to subscript iterator outside of valid range");
1353#endif
1354        return __i[__n];
1355    }
1356
1357    _LIBCPP_INLINE_VISIBILITY iterator_type base() const _NOEXCEPT {return __i;}
1358
1359private:
1360#if _LIBCPP_DEBUG_LEVEL >= 2
1361    _LIBCPP_INLINE_VISIBILITY __wrap_iter(const void* __p, iterator_type __x) : __i(__x)
1362    {
1363        __get_db()->__insert_ic(this, __p);
1364    }
1365#else
1366    _LIBCPP_INLINE_VISIBILITY __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {}
1367#endif
1368
1369    template <class _Up> friend class __wrap_iter;
1370    template <class _CharT, class _Traits, class _Alloc> friend class basic_string;
1371    template <class _Tp, class _Alloc> friend class _LIBCPP_TYPE_VIS_ONLY vector;
1372
1373    template <class _Iter1, class _Iter2>
1374    friend
1375    bool
1376    operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1377
1378    template <class _Iter1, class _Iter2>
1379    friend
1380    bool
1381    operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1382
1383    template <class _Iter1, class _Iter2>
1384    friend
1385    bool
1386    operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1387
1388    template <class _Iter1, class _Iter2>
1389    friend
1390    bool
1391    operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1392
1393    template <class _Iter1, class _Iter2>
1394    friend
1395    bool
1396    operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1397
1398    template <class _Iter1, class _Iter2>
1399    friend
1400    bool
1401    operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1402
1403#ifndef _LIBCPP_CXX03_LANG
1404    template <class _Iter1, class _Iter2>
1405    friend
1406    auto
1407    operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1408    -> decltype(__x.base() - __y.base());
1409#else
1410    template <class _Iter1, class _Iter2>
1411    friend
1412    typename __wrap_iter<_Iter1>::difference_type
1413    operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1414#endif
1415
1416    template <class _Iter1>
1417    friend
1418    __wrap_iter<_Iter1>
1419    operator+(typename __wrap_iter<_Iter1>::difference_type, __wrap_iter<_Iter1>) _NOEXCEPT;
1420
1421    template <class _Ip, class _Op> friend _Op copy(_Ip, _Ip, _Op);
1422    template <class _B1, class _B2> friend _B2 copy_backward(_B1, _B1, _B2);
1423    template <class _Ip, class _Op> friend _Op move(_Ip, _Ip, _Op);
1424    template <class _B1, class _B2> friend _B2 move_backward(_B1, _B1, _B2);
1425
1426    template <class _Tp>
1427    friend
1428    typename enable_if
1429    <
1430        is_trivially_copy_assignable<_Tp>::value,
1431        _Tp*
1432    >::type
1433    __unwrap_iter(__wrap_iter<_Tp*>);
1434};
1435
1436template <class _Iter1, class _Iter2>
1437inline _LIBCPP_INLINE_VISIBILITY
1438bool
1439operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1440{
1441    return __x.base() == __y.base();
1442}
1443
1444template <class _Iter1, class _Iter2>
1445inline _LIBCPP_INLINE_VISIBILITY
1446bool
1447operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1448{
1449#if _LIBCPP_DEBUG_LEVEL >= 2
1450    _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1451                   "Attempted to compare incomparable iterators");
1452#endif
1453    return __x.base() < __y.base();
1454}
1455
1456template <class _Iter1, class _Iter2>
1457inline _LIBCPP_INLINE_VISIBILITY
1458bool
1459operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1460{
1461    return !(__x == __y);
1462}
1463
1464template <class _Iter1, class _Iter2>
1465inline _LIBCPP_INLINE_VISIBILITY
1466bool
1467operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1468{
1469    return __y < __x;
1470}
1471
1472template <class _Iter1, class _Iter2>
1473inline _LIBCPP_INLINE_VISIBILITY
1474bool
1475operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1476{
1477    return !(__x < __y);
1478}
1479
1480template <class _Iter1, class _Iter2>
1481inline _LIBCPP_INLINE_VISIBILITY
1482bool
1483operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1484{
1485    return !(__y < __x);
1486}
1487
1488template <class _Iter1>
1489inline _LIBCPP_INLINE_VISIBILITY
1490bool
1491operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1492{
1493    return !(__x == __y);
1494}
1495
1496template <class _Iter1>
1497inline _LIBCPP_INLINE_VISIBILITY
1498bool
1499operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1500{
1501    return __y < __x;
1502}
1503
1504template <class _Iter1>
1505inline _LIBCPP_INLINE_VISIBILITY
1506bool
1507operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1508{
1509    return !(__x < __y);
1510}
1511
1512template <class _Iter1>
1513inline _LIBCPP_INLINE_VISIBILITY
1514bool
1515operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1516{
1517    return !(__y < __x);
1518}
1519
1520#ifndef _LIBCPP_CXX03_LANG
1521template <class _Iter1, class _Iter2>
1522inline _LIBCPP_INLINE_VISIBILITY
1523auto
1524operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1525-> decltype(__x.base() - __y.base())
1526{
1527#if _LIBCPP_DEBUG_LEVEL >= 2
1528    _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1529                   "Attempted to subtract incompatible iterators");
1530#endif
1531    return __x.base() - __y.base();
1532}
1533#else
1534template <class _Iter1, class _Iter2>
1535inline _LIBCPP_INLINE_VISIBILITY
1536typename __wrap_iter<_Iter1>::difference_type
1537operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1538{
1539#if _LIBCPP_DEBUG_LEVEL >= 2
1540    _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1541                   "Attempted to subtract incompatible iterators");
1542#endif
1543    return __x.base() - __y.base();
1544}
1545#endif
1546
1547template <class _Iter>
1548inline _LIBCPP_INLINE_VISIBILITY
1549__wrap_iter<_Iter>
1550operator+(typename __wrap_iter<_Iter>::difference_type __n,
1551          __wrap_iter<_Iter> __x) _NOEXCEPT
1552{
1553    __x += __n;
1554    return __x;
1555}
1556
1557template <class _Iter>
1558struct __libcpp_is_trivial_iterator
1559    : public _LIBCPP_BOOL_CONSTANT(is_pointer<_Iter>::value) {};
1560
1561template <class _Iter>
1562struct __libcpp_is_trivial_iterator<move_iterator<_Iter> >
1563    : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
1564
1565template <class _Iter>
1566struct __libcpp_is_trivial_iterator<reverse_iterator<_Iter> >
1567    : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
1568
1569template <class _Iter>
1570struct __libcpp_is_trivial_iterator<__wrap_iter<_Iter> >
1571    : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
1572
1573
1574template <class _Tp, size_t _Np>
1575inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1576_Tp*
1577begin(_Tp (&__array)[_Np])
1578{
1579    return __array;
1580}
1581
1582template <class _Tp, size_t _Np>
1583inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1584_Tp*
1585end(_Tp (&__array)[_Np])
1586{
1587    return __array + _Np;
1588}
1589
1590#if !defined(_LIBCPP_CXX03_LANG)
1591
1592template <class _Cp>
1593inline _LIBCPP_INLINE_VISIBILITY
1594auto
1595begin(_Cp& __c) -> decltype(__c.begin())
1596{
1597    return __c.begin();
1598}
1599
1600template <class _Cp>
1601inline _LIBCPP_INLINE_VISIBILITY
1602auto
1603begin(const _Cp& __c) -> decltype(__c.begin())
1604{
1605    return __c.begin();
1606}
1607
1608template <class _Cp>
1609inline _LIBCPP_INLINE_VISIBILITY
1610auto
1611end(_Cp& __c) -> decltype(__c.end())
1612{
1613    return __c.end();
1614}
1615
1616template <class _Cp>
1617inline _LIBCPP_INLINE_VISIBILITY
1618auto
1619end(const _Cp& __c) -> decltype(__c.end())
1620{
1621    return __c.end();
1622}
1623
1624#if _LIBCPP_STD_VER > 11
1625
1626template <class _Tp, size_t _Np>
1627inline _LIBCPP_INLINE_VISIBILITY
1628reverse_iterator<_Tp*> rbegin(_Tp (&__array)[_Np])
1629{
1630    return reverse_iterator<_Tp*>(__array + _Np);
1631}
1632
1633template <class _Tp, size_t _Np>
1634inline _LIBCPP_INLINE_VISIBILITY
1635reverse_iterator<_Tp*> rend(_Tp (&__array)[_Np])
1636{
1637    return reverse_iterator<_Tp*>(__array);
1638}
1639
1640template <class _Ep>
1641inline _LIBCPP_INLINE_VISIBILITY
1642reverse_iterator<const _Ep*> rbegin(initializer_list<_Ep> __il)
1643{
1644    return reverse_iterator<const _Ep*>(__il.end());
1645}
1646
1647template <class _Ep>
1648inline _LIBCPP_INLINE_VISIBILITY
1649reverse_iterator<const _Ep*> rend(initializer_list<_Ep> __il)
1650{
1651    return reverse_iterator<const _Ep*>(__il.begin());
1652}
1653
1654template <class _Cp>
1655inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1656auto cbegin(const _Cp& __c) -> decltype(_VSTD::begin(__c))
1657{
1658    return _VSTD::begin(__c);
1659}
1660
1661template <class _Cp>
1662inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1663auto cend(const _Cp& __c) -> decltype(_VSTD::end(__c))
1664{
1665    return _VSTD::end(__c);
1666}
1667
1668template <class _Cp>
1669inline _LIBCPP_INLINE_VISIBILITY
1670auto rbegin(_Cp& __c) -> decltype(__c.rbegin())
1671{
1672    return __c.rbegin();
1673}
1674
1675template <class _Cp>
1676inline _LIBCPP_INLINE_VISIBILITY
1677auto rbegin(const _Cp& __c) -> decltype(__c.rbegin())
1678{
1679    return __c.rbegin();
1680}
1681
1682template <class _Cp>
1683inline _LIBCPP_INLINE_VISIBILITY
1684auto rend(_Cp& __c) -> decltype(__c.rend())
1685{
1686    return __c.rend();
1687}
1688
1689template <class _Cp>
1690inline _LIBCPP_INLINE_VISIBILITY
1691auto rend(const _Cp& __c) -> decltype(__c.rend())
1692{
1693    return __c.rend();
1694}
1695
1696template <class _Cp>
1697inline _LIBCPP_INLINE_VISIBILITY
1698auto crbegin(const _Cp& __c) -> decltype(_VSTD::rbegin(__c))
1699{
1700    return _VSTD::rbegin(__c);
1701}
1702
1703template <class _Cp>
1704inline _LIBCPP_INLINE_VISIBILITY
1705auto crend(const _Cp& __c) -> decltype(_VSTD::rend(__c))
1706{
1707    return _VSTD::rend(__c);
1708}
1709
1710#endif
1711
1712
1713#else  // defined(_LIBCPP_CXX03_LANG)
1714
1715template <class _Cp>
1716inline _LIBCPP_INLINE_VISIBILITY
1717typename _Cp::iterator
1718begin(_Cp& __c)
1719{
1720    return __c.begin();
1721}
1722
1723template <class _Cp>
1724inline _LIBCPP_INLINE_VISIBILITY
1725typename _Cp::const_iterator
1726begin(const _Cp& __c)
1727{
1728    return __c.begin();
1729}
1730
1731template <class _Cp>
1732inline _LIBCPP_INLINE_VISIBILITY
1733typename _Cp::iterator
1734end(_Cp& __c)
1735{
1736    return __c.end();
1737}
1738
1739template <class _Cp>
1740inline _LIBCPP_INLINE_VISIBILITY
1741typename _Cp::const_iterator
1742end(const _Cp& __c)
1743{
1744    return __c.end();
1745}
1746
1747#endif  // !defined(_LIBCPP_CXX03_LANG)
1748
1749#if _LIBCPP_STD_VER > 14
1750template <class _Cont>
1751constexpr auto size(const _Cont& __c) -> decltype(__c.size()) { return __c.size(); }
1752
1753template <class _Tp, size_t _Sz>
1754constexpr size_t size(const _Tp (&__array)[_Sz]) noexcept { return _Sz; }
1755
1756template <class _Cont>
1757constexpr auto empty(const _Cont& __c) -> decltype(__c.empty()) { return __c.empty(); }
1758
1759template <class _Tp, size_t _Sz>
1760constexpr bool empty(const _Tp (&__array)[_Sz]) noexcept { return false; }
1761
1762template <class _Ep>
1763constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; }
1764
1765template <class _Cont> constexpr
1766auto data(_Cont& __c) -> decltype(__c.data()) { return __c.data(); }
1767
1768template <class _Cont> constexpr
1769auto data(const _Cont& __c) -> decltype(__c.data()) { return __c.data(); }
1770
1771template <class _Tp, size_t _Sz>
1772constexpr _Tp* data(_Tp (&__array)[_Sz]) noexcept { return __array; }
1773
1774template <class _Ep>
1775constexpr const _Ep* data(initializer_list<_Ep> __il) noexcept { return __il.begin(); }
1776#endif
1777
1778
1779_LIBCPP_END_NAMESPACE_STD
1780
1781#endif  // _LIBCPP_ITERATOR
1782