2 //===-------------------------- iterator ----------------------------------===//
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
8 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP_ITERATOR
11 #define _LIBCPP_ITERATOR
19 template<class Iterator>
20 struct iterator_traits
22 typedef typename Iterator::difference_type difference_type;
23 typedef typename Iterator::value_type value_type;
24 typedef typename Iterator::pointer pointer;
25 typedef typename Iterator::reference reference;
26 typedef typename Iterator::iterator_category iterator_category;
30 struct iterator_traits<T*>
32 typedef ptrdiff_t difference_type;
36 typedef random_access_iterator_tag iterator_category;
39 template<class Category, class T, class Distance = ptrdiff_t,
40 class Pointer = T*, class Reference = T&>
44 typedef Distance difference_type;
45 typedef Pointer pointer;
46 typedef Reference reference;
47 typedef Category iterator_category;
50 struct input_iterator_tag {};
51 struct output_iterator_tag {};
52 struct forward_iterator_tag : public input_iterator_tag {};
53 struct bidirectional_iterator_tag : public forward_iterator_tag {};
54 struct random_access_iterator_tag : public bidirectional_iterator_tag {};
56 // 27.4.3, iterator operations
57 // extension: second argument not conforming to C++03
58 template <class InputIterator> // constexpr in C++17
59 constexpr void advance(InputIterator& i,
60 typename iterator_traits<InputIterator>::difference_type n);
62 template <class InputIterator> // constexpr in C++17
63 constexpr typename iterator_traits<InputIterator>::difference_type
64 distance(InputIterator first, InputIterator last);
66 template <class InputIterator> // constexpr in C++17
67 constexpr InputIterator next(InputIterator x,
68 typename iterator_traits<InputIterator>::difference_type n = 1);
70 template <class BidirectionalIterator> // constexpr in C++17
71 constexpr BidirectionalIterator prev(BidirectionalIterator x,
72 typename iterator_traits<BidirectionalIterator>::difference_type n = 1);
74 template <class Iterator>
75 class reverse_iterator
76 : public iterator<typename iterator_traits<Iterator>::iterator_category,
77 typename iterator_traits<Iterator>::value_type,
78 typename iterator_traits<Iterator>::difference_type,
79 typename iterator_traits<Iterator>::pointer,
80 typename iterator_traits<Iterator>::reference>
85 typedef Iterator iterator_type;
86 typedef typename iterator_traits<Iterator>::difference_type difference_type;
87 typedef typename iterator_traits<Iterator>::reference reference;
88 typedef typename iterator_traits<Iterator>::pointer pointer;
90 constexpr reverse_iterator();
91 constexpr explicit reverse_iterator(Iterator x);
92 template <class U> constexpr reverse_iterator(const reverse_iterator<U>& u);
93 template <class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u);
94 constexpr Iterator base() const;
95 constexpr reference operator*() const;
96 constexpr pointer operator->() const;
97 constexpr reverse_iterator& operator++();
98 constexpr reverse_iterator operator++(int);
99 constexpr reverse_iterator& operator--();
100 constexpr reverse_iterator operator--(int);
101 constexpr reverse_iterator operator+ (difference_type n) const;
102 constexpr reverse_iterator& operator+=(difference_type n);
103 constexpr reverse_iterator operator- (difference_type n) const;
104 constexpr reverse_iterator& operator-=(difference_type n);
105 constexpr reference operator[](difference_type n) const;
108 template <class Iterator1, class Iterator2>
109 constexpr bool // constexpr in C++17
110 operator==(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
112 template <class Iterator1, class Iterator2>
113 constexpr bool // constexpr in C++17
114 operator<(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
116 template <class Iterator1, class Iterator2>
117 constexpr bool // constexpr in C++17
118 operator!=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
120 template <class Iterator1, class Iterator2>
121 constexpr bool // constexpr in C++17
122 operator>(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
124 template <class Iterator1, class Iterator2>
125 constexpr bool // constexpr in C++17
126 operator>=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
128 template <class Iterator1, class Iterator2>
129 constexpr bool // constexpr in C++17
130 operator<=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
132 template <class Iterator1, class Iterator2>
134 operator-(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y)
135 -> decltype(__y.base() - __x.base()); // constexpr in C++17
137 template <class Iterator>
138 constexpr reverse_iterator<Iterator>
139 operator+(typename reverse_iterator<Iterator>::difference_type n,
140 const reverse_iterator<Iterator>& x); // constexpr in C++17
142 template <class Iterator>
143 constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i); // C++14, constexpr in C++17
145 template <class Container>
146 class back_insert_iterator
149 Container* container;
151 typedef Container container_type;
152 typedef void value_type;
153 typedef void difference_type;
154 typedef void reference;
155 typedef void pointer;
157 explicit back_insert_iterator(Container& x);
158 back_insert_iterator& operator=(const typename Container::value_type& value);
159 back_insert_iterator& operator*();
160 back_insert_iterator& operator++();
161 back_insert_iterator operator++(int);
164 template <class Container> back_insert_iterator<Container> back_inserter(Container& x);
166 template <class Container>
167 class front_insert_iterator
170 Container* container;
172 typedef Container container_type;
173 typedef void value_type;
174 typedef void difference_type;
175 typedef void reference;
176 typedef void pointer;
178 explicit front_insert_iterator(Container& x);
179 front_insert_iterator& operator=(const typename Container::value_type& value);
180 front_insert_iterator& operator*();
181 front_insert_iterator& operator++();
182 front_insert_iterator operator++(int);
185 template <class Container> front_insert_iterator<Container> front_inserter(Container& x);
187 template <class Container>
188 class insert_iterator
191 Container* container;
192 typename Container::iterator iter;
194 typedef Container container_type;
195 typedef void value_type;
196 typedef void difference_type;
197 typedef void reference;
198 typedef void pointer;
200 insert_iterator(Container& x, typename Container::iterator i);
201 insert_iterator& operator=(const typename Container::value_type& value);
202 insert_iterator& operator*();
203 insert_iterator& operator++();
204 insert_iterator& operator++(int);
207 template <class Container, class Iterator>
208 insert_iterator<Container> inserter(Container& x, Iterator i);
210 template <class Iterator>
211 class move_iterator {
213 typedef Iterator iterator_type;
214 typedef typename iterator_traits<Iterator>::difference_type difference_type;
215 typedef Iterator pointer;
216 typedef typename iterator_traits<Iterator>::value_type value_type;
217 typedef typename iterator_traits<Iterator>::iterator_category iterator_category;
218 typedef value_type&& reference;
220 constexpr move_iterator(); // all the constexprs are in C++17
221 constexpr explicit move_iterator(Iterator i);
223 constexpr move_iterator(const move_iterator<U>& u);
225 constexpr move_iterator& operator=(const move_iterator<U>& u);
226 constexpr iterator_type base() const;
227 constexpr reference operator*() const;
228 constexpr pointer operator->() const;
229 constexpr move_iterator& operator++();
230 constexpr move_iterator operator++(int);
231 constexpr move_iterator& operator--();
232 constexpr move_iterator operator--(int);
233 constexpr move_iterator operator+(difference_type n) const;
234 constexpr move_iterator& operator+=(difference_type n);
235 constexpr move_iterator operator-(difference_type n) const;
236 constexpr move_iterator& operator-=(difference_type n);
237 constexpr unspecified operator[](difference_type n) const;
239 Iterator current; // exposition only
242 template <class Iterator1, class Iterator2>
243 constexpr bool // constexpr in C++17
244 operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
246 template <class Iterator1, class Iterator2>
247 constexpr bool // constexpr in C++17
248 operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
250 template <class Iterator1, class Iterator2>
251 constexpr bool // constexpr in C++17
252 operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
254 template <class Iterator1, class Iterator2>
255 constexpr bool // constexpr in C++17
256 operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
258 template <class Iterator1, class Iterator2>
259 constexpr bool // constexpr in C++17
260 operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
262 template <class Iterator1, class Iterator2>
263 constexpr bool // constexpr in C++17
264 operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
266 template <class Iterator1, class Iterator2>
267 constexpr auto // constexpr in C++17
268 operator-(const move_iterator<Iterator1>& x,
269 const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base());
271 template <class Iterator>
272 constexpr move_iterator<Iterator> operator+( // constexpr in C++17
273 typename move_iterator<Iterator>::difference_type n,
274 const move_iterator<Iterator>& x);
276 template <class Iterator> // constexpr in C++17
277 constexpr move_iterator<Iterator> make_move_iterator(const Iterator& i);
280 template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t>
281 class istream_iterator
282 : public iterator<input_iterator_tag, T, Distance, const T*, const T&>
285 typedef charT char_type;
286 typedef traits traits_type;
287 typedef basic_istream<charT,traits> istream_type;
289 constexpr istream_iterator();
290 istream_iterator(istream_type& s);
291 istream_iterator(const istream_iterator& x);
294 const T& operator*() const;
295 const T* operator->() const;
296 istream_iterator& operator++();
297 istream_iterator operator++(int);
300 template <class T, class charT, class traits, class Distance>
301 bool operator==(const istream_iterator<T,charT,traits,Distance>& x,
302 const istream_iterator<T,charT,traits,Distance>& y);
303 template <class T, class charT, class traits, class Distance>
304 bool operator!=(const istream_iterator<T,charT,traits,Distance>& x,
305 const istream_iterator<T,charT,traits,Distance>& y);
307 template <class T, class charT = char, class traits = char_traits<charT> >
308 class ostream_iterator
309 : public iterator<output_iterator_tag, void, void, void ,void>
312 typedef charT char_type;
313 typedef traits traits_type;
314 typedef basic_ostream<charT,traits> ostream_type;
316 ostream_iterator(ostream_type& s);
317 ostream_iterator(ostream_type& s, const charT* delimiter);
318 ostream_iterator(const ostream_iterator& x);
320 ostream_iterator& operator=(const T& value);
322 ostream_iterator& operator*();
323 ostream_iterator& operator++();
324 ostream_iterator& operator++(int);
327 template<class charT, class traits = char_traits<charT> >
328 class istreambuf_iterator
329 : public iterator<input_iterator_tag, charT,
330 typename traits::off_type, unspecified,
334 typedef charT char_type;
335 typedef traits traits_type;
336 typedef typename traits::int_type int_type;
337 typedef basic_streambuf<charT,traits> streambuf_type;
338 typedef basic_istream<charT,traits> istream_type;
340 istreambuf_iterator() noexcept;
341 istreambuf_iterator(istream_type& s) noexcept;
342 istreambuf_iterator(streambuf_type* s) noexcept;
343 istreambuf_iterator(a-private-type) noexcept;
345 charT operator*() const;
346 pointer operator->() const;
347 istreambuf_iterator& operator++();
348 a-private-type operator++(int);
350 bool equal(const istreambuf_iterator& b) const;
353 template <class charT, class traits>
354 bool operator==(const istreambuf_iterator<charT,traits>& a,
355 const istreambuf_iterator<charT,traits>& b);
356 template <class charT, class traits>
357 bool operator!=(const istreambuf_iterator<charT,traits>& a,
358 const istreambuf_iterator<charT,traits>& b);
360 template <class charT, class traits = char_traits<charT> >
361 class ostreambuf_iterator
362 : public iterator<output_iterator_tag, void, void, void, void>
365 typedef charT char_type;
366 typedef traits traits_type;
367 typedef basic_streambuf<charT,traits> streambuf_type;
368 typedef basic_ostream<charT,traits> ostream_type;
370 ostreambuf_iterator(ostream_type& s) noexcept;
371 ostreambuf_iterator(streambuf_type* s) noexcept;
372 ostreambuf_iterator& operator=(charT c);
373 ostreambuf_iterator& operator*();
374 ostreambuf_iterator& operator++();
375 ostreambuf_iterator& operator++(int);
376 bool failed() const noexcept;
379 template <class C> constexpr auto begin(C& c) -> decltype(c.begin());
380 template <class C> constexpr auto begin(const C& c) -> decltype(c.begin());
381 template <class C> constexpr auto end(C& c) -> decltype(c.end());
382 template <class C> constexpr auto end(const C& c) -> decltype(c.end());
383 template <class T, size_t N> constexpr T* begin(T (&array)[N]);
384 template <class T, size_t N> constexpr T* end(T (&array)[N]);
386 template <class C> auto constexpr cbegin(const C& c) -> decltype(std::begin(c)); // C++14
387 template <class C> auto constexpr cend(const C& c) -> decltype(std::end(c)); // C++14
388 template <class C> auto constexpr rbegin(C& c) -> decltype(c.rbegin()); // C++14
389 template <class C> auto constexpr rbegin(const C& c) -> decltype(c.rbegin()); // C++14
390 template <class C> auto constexpr rend(C& c) -> decltype(c.rend()); // C++14
391 template <class C> constexpr auto rend(const C& c) -> decltype(c.rend()); // C++14
392 template <class E> reverse_iterator<const E*> constexpr rbegin(initializer_list<E> il); // C++14
393 template <class E> reverse_iterator<const E*> constexpr rend(initializer_list<E> il); // C++14
394 template <class T, size_t N> reverse_iterator<T*> constexpr rbegin(T (&array)[N]); // C++14
395 template <class T, size_t N> reverse_iterator<T*> constexpr rend(T (&array)[N]); // C++14
396 template <class C> constexpr auto crbegin(const C& c) -> decltype(std::rbegin(c)); // C++14
397 template <class C> constexpr auto crend(const C& c) -> decltype(std::rend(c)); // C++14
399 // 24.8, container access:
400 template <class C> constexpr auto size(const C& c) -> decltype(c.size()); // C++17
401 template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17
403 template <class C> constexpr auto ssize(const C& c)
404 -> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size())>>; // C++20
405 template <class T, ptrdiff_t> constexpr ptrdiff_t ssize(const T (&array)[N]) noexcept; // C++20
407 template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17
408 template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17
409 template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17
410 template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17
411 template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17
412 template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17
413 template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17
420 #include <iosfwd> // for forward declarations of vector and string.
421 #include <__functional_base>
422 #include <type_traits>
424 #include <initializer_list>
427 #include <Availability.h>
432 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
433 #pragma GCC system_header
436 _LIBCPP_BEGIN_NAMESPACE_STD
438 struct _LIBCPP_TEMPLATE_VIS input_iterator_tag {};
439 struct _LIBCPP_TEMPLATE_VIS output_iterator_tag {};
440 struct _LIBCPP_TEMPLATE_VIS forward_iterator_tag : public input_iterator_tag {};
441 struct _LIBCPP_TEMPLATE_VIS bidirectional_iterator_tag : public forward_iterator_tag {};
442 struct _LIBCPP_TEMPLATE_VIS random_access_iterator_tag : public bidirectional_iterator_tag {};
445 struct __has_iterator_typedefs
448 struct __two {char __lx; char __lxx;};
449 template <class _Up> static __two __test(...);
450 template <class _Up> static char __test(typename std::__void_t<typename _Up::iterator_category>::type* = 0,
451 typename std::__void_t<typename _Up::difference_type>::type* = 0,
452 typename std::__void_t<typename _Up::value_type>::type* = 0,
453 typename std::__void_t<typename _Up::reference>::type* = 0,
454 typename std::__void_t<typename _Up::pointer>::type* = 0
457 static const bool value = sizeof(__test<_Tp>(0,0,0,0,0)) == 1;
462 struct __has_iterator_category
465 struct __two {char __lx; char __lxx;};
466 template <class _Up> static __two __test(...);
467 template <class _Up> static char __test(typename _Up::iterator_category* = 0);
469 static const bool value = sizeof(__test<_Tp>(0)) == 1;
472 template <class _Iter, bool> struct __iterator_traits_impl {};
474 template <class _Iter>
475 struct __iterator_traits_impl<_Iter, true>
477 typedef typename _Iter::difference_type difference_type;
478 typedef typename _Iter::value_type value_type;
479 typedef typename _Iter::pointer pointer;
480 typedef typename _Iter::reference reference;
481 typedef typename _Iter::iterator_category iterator_category;
484 template <class _Iter, bool> struct __iterator_traits {};
486 template <class _Iter>
487 struct __iterator_traits<_Iter, true>
488 : __iterator_traits_impl
491 is_convertible<typename _Iter::iterator_category, input_iterator_tag>::value ||
492 is_convertible<typename _Iter::iterator_category, output_iterator_tag>::value
496 // iterator_traits<Iterator> will only have the nested types if Iterator::iterator_category
497 // exists. Else iterator_traits<Iterator> will be an empty class. This is a
498 // conforming extension which allows some programs to compile and behave as
499 // the client expects instead of failing at compile time.
501 template <class _Iter>
502 struct _LIBCPP_TEMPLATE_VIS iterator_traits
503 : __iterator_traits<_Iter, __has_iterator_typedefs<_Iter>::value> {};
506 struct _LIBCPP_TEMPLATE_VIS iterator_traits<_Tp*>
508 typedef ptrdiff_t difference_type;
509 typedef typename remove_cv<_Tp>::type value_type;
510 typedef _Tp* pointer;
511 typedef _Tp& reference;
512 typedef random_access_iterator_tag iterator_category;
515 template <class _Tp, class _Up, bool = __has_iterator_category<iterator_traits<_Tp> >::value>
516 struct __has_iterator_category_convertible_to
517 : public integral_constant<bool, is_convertible<typename iterator_traits<_Tp>::iterator_category, _Up>::value>
520 template <class _Tp, class _Up>
521 struct __has_iterator_category_convertible_to<_Tp, _Up, false> : public false_type {};
524 struct __is_input_iterator : public __has_iterator_category_convertible_to<_Tp, input_iterator_tag> {};
527 struct __is_forward_iterator : public __has_iterator_category_convertible_to<_Tp, forward_iterator_tag> {};
530 struct __is_bidirectional_iterator : public __has_iterator_category_convertible_to<_Tp, bidirectional_iterator_tag> {};
533 struct __is_random_access_iterator : public __has_iterator_category_convertible_to<_Tp, random_access_iterator_tag> {};
536 struct __is_exactly_input_iterator
537 : public integral_constant<bool,
538 __has_iterator_category_convertible_to<_Tp, input_iterator_tag>::value &&
539 !__has_iterator_category_convertible_to<_Tp, forward_iterator_tag>::value> {};
541 #ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
542 template<class _InputIterator>
543 using __iter_value_type = typename iterator_traits<_InputIterator>::value_type;
545 template<class _InputIterator>
546 using __iter_key_type = remove_const_t<typename iterator_traits<_InputIterator>::value_type::first_type>;
548 template<class _InputIterator>
549 using __iter_mapped_type = typename iterator_traits<_InputIterator>::value_type::second_type;
551 template<class _InputIterator>
552 using __iter_to_alloc_type = pair<
553 add_const_t<typename iterator_traits<_InputIterator>::value_type::first_type>,
554 typename iterator_traits<_InputIterator>::value_type::second_type>;
557 template<class _Category, class _Tp, class _Distance = ptrdiff_t,
558 class _Pointer = _Tp*, class _Reference = _Tp&>
559 struct _LIBCPP_TEMPLATE_VIS iterator
561 typedef _Tp value_type;
562 typedef _Distance difference_type;
563 typedef _Pointer pointer;
564 typedef _Reference reference;
565 typedef _Category iterator_category;
568 template <class _InputIter>
569 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
570 void __advance(_InputIter& __i,
571 typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag)
573 for (; __n > 0; --__n)
577 template <class _BiDirIter>
578 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
579 void __advance(_BiDirIter& __i,
580 typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag)
583 for (; __n > 0; --__n)
586 for (; __n < 0; ++__n)
590 template <class _RandIter>
591 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
592 void __advance(_RandIter& __i,
593 typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag)
598 template <class _InputIter>
599 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
600 void advance(_InputIter& __i,
601 typename iterator_traits<_InputIter>::difference_type __n)
603 _LIBCPP_ASSERT(__n >= 0 || __is_bidirectional_iterator<_InputIter>::value,
604 "Attempt to advance(it, -n) on a non-bidi iterator");
605 __advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category());
608 template <class _InputIter>
609 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
610 typename iterator_traits<_InputIter>::difference_type
611 __distance(_InputIter __first, _InputIter __last, input_iterator_tag)
613 typename iterator_traits<_InputIter>::difference_type __r(0);
614 for (; __first != __last; ++__first)
619 template <class _RandIter>
620 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
621 typename iterator_traits<_RandIter>::difference_type
622 __distance(_RandIter __first, _RandIter __last, random_access_iterator_tag)
624 return __last - __first;
627 template <class _InputIter>
628 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
629 typename iterator_traits<_InputIter>::difference_type
630 distance(_InputIter __first, _InputIter __last)
632 return __distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category());
635 template <class _InputIter>
636 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
639 __is_input_iterator<_InputIter>::value,
643 typename iterator_traits<_InputIter>::difference_type __n = 1)
645 _LIBCPP_ASSERT(__n >= 0 || __is_bidirectional_iterator<_InputIter>::value,
646 "Attempt to next(it, -n) on a non-bidi iterator");
648 _VSTD::advance(__x, __n);
652 template <class _InputIter>
653 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
656 __is_input_iterator<_InputIter>::value,
660 typename iterator_traits<_InputIter>::difference_type __n = 1)
662 _LIBCPP_ASSERT(__n <= 0 || __is_bidirectional_iterator<_InputIter>::value,
663 "Attempt to prev(it, +n) on a non-bidi iterator");
664 _VSTD::advance(__x, -__n);
669 template <class _Tp, class = void>
670 struct __is_stashing_iterator : false_type {};
673 struct __is_stashing_iterator<_Tp, typename __void_t<typename _Tp::__stashing_iterator_tag>::type>
676 template <class _Iter>
677 class _LIBCPP_TEMPLATE_VIS reverse_iterator
678 : public iterator<typename iterator_traits<_Iter>::iterator_category,
679 typename iterator_traits<_Iter>::value_type,
680 typename iterator_traits<_Iter>::difference_type,
681 typename iterator_traits<_Iter>::pointer,
682 typename iterator_traits<_Iter>::reference>
685 /*mutable*/ _Iter __t; // no longer used as of LWG #2360, not removed due to ABI break
687 static_assert(!__is_stashing_iterator<_Iter>::value,
688 "The specified iterator type cannot be used with reverse_iterator; "
689 "Using stashing iterators with reverse_iterator causes undefined behavior");
694 typedef _Iter iterator_type;
695 typedef typename iterator_traits<_Iter>::difference_type difference_type;
696 typedef typename iterator_traits<_Iter>::reference reference;
697 typedef typename iterator_traits<_Iter>::pointer pointer;
699 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
700 reverse_iterator() : __t(), current() {}
701 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
702 explicit reverse_iterator(_Iter __x) : __t(__x), current(__x) {}
704 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
705 reverse_iterator(const reverse_iterator<_Up>& __u) : __t(__u.base()), current(__u.base()) {}
707 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
708 reverse_iterator& operator=(const reverse_iterator<_Up>& __u)
709 { __t = current = __u.base(); return *this; }
710 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
711 _Iter base() const {return current;}
712 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
713 reference operator*() const {_Iter __tmp = current; return *--__tmp;}
714 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
715 pointer operator->() const {return _VSTD::addressof(operator*());}
716 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
717 reverse_iterator& operator++() {--current; return *this;}
718 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
719 reverse_iterator operator++(int) {reverse_iterator __tmp(*this); --current; return __tmp;}
720 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
721 reverse_iterator& operator--() {++current; return *this;}
722 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
723 reverse_iterator operator--(int) {reverse_iterator __tmp(*this); ++current; return __tmp;}
724 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
725 reverse_iterator operator+ (difference_type __n) const {return reverse_iterator(current - __n);}
726 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
727 reverse_iterator& operator+=(difference_type __n) {current -= __n; return *this;}
728 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
729 reverse_iterator operator- (difference_type __n) const {return reverse_iterator(current + __n);}
730 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
731 reverse_iterator& operator-=(difference_type __n) {current += __n; return *this;}
732 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
733 reference operator[](difference_type __n) const {return *(*this + __n);}
736 template <class _Iter1, class _Iter2>
737 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
739 operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
741 return __x.base() == __y.base();
744 template <class _Iter1, class _Iter2>
745 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
747 operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
749 return __x.base() > __y.base();
752 template <class _Iter1, class _Iter2>
753 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
755 operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
757 return __x.base() != __y.base();
760 template <class _Iter1, class _Iter2>
761 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
763 operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
765 return __x.base() < __y.base();
768 template <class _Iter1, class _Iter2>
769 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
771 operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
773 return __x.base() <= __y.base();
776 template <class _Iter1, class _Iter2>
777 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
779 operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
781 return __x.base() >= __y.base();
784 #ifndef _LIBCPP_CXX03_LANG
785 template <class _Iter1, class _Iter2>
786 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
788 operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
789 -> decltype(__y.base() - __x.base())
791 return __y.base() - __x.base();
794 template <class _Iter1, class _Iter2>
795 inline _LIBCPP_INLINE_VISIBILITY
796 typename reverse_iterator<_Iter1>::difference_type
797 operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
799 return __y.base() - __x.base();
803 template <class _Iter>
804 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
805 reverse_iterator<_Iter>
806 operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_iterator<_Iter>& __x)
808 return reverse_iterator<_Iter>(__x.base() - __n);
811 #if _LIBCPP_STD_VER > 11
812 template <class _Iter>
813 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
814 reverse_iterator<_Iter> make_reverse_iterator(_Iter __i)
816 return reverse_iterator<_Iter>(__i);
820 template <class _Container>
821 class _LIBCPP_TEMPLATE_VIS back_insert_iterator
822 : public iterator<output_iterator_tag,
829 _Container* container;
831 typedef _Container container_type;
833 _LIBCPP_INLINE_VISIBILITY explicit back_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {}
834 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(const typename _Container::value_type& __value_)
835 {container->push_back(__value_); return *this;}
836 #ifndef _LIBCPP_CXX03_LANG
837 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(typename _Container::value_type&& __value_)
838 {container->push_back(_VSTD::move(__value_)); return *this;}
839 #endif // _LIBCPP_CXX03_LANG
840 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator*() {return *this;}
841 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator++() {return *this;}
842 _LIBCPP_INLINE_VISIBILITY back_insert_iterator operator++(int) {return *this;}
845 template <class _Container>
846 inline _LIBCPP_INLINE_VISIBILITY
847 back_insert_iterator<_Container>
848 back_inserter(_Container& __x)
850 return back_insert_iterator<_Container>(__x);
853 template <class _Container>
854 class _LIBCPP_TEMPLATE_VIS front_insert_iterator
855 : public iterator<output_iterator_tag,
862 _Container* container;
864 typedef _Container container_type;
866 _LIBCPP_INLINE_VISIBILITY explicit front_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {}
867 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(const typename _Container::value_type& __value_)
868 {container->push_front(__value_); return *this;}
869 #ifndef _LIBCPP_CXX03_LANG
870 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(typename _Container::value_type&& __value_)
871 {container->push_front(_VSTD::move(__value_)); return *this;}
872 #endif // _LIBCPP_CXX03_LANG
873 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator*() {return *this;}
874 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator++() {return *this;}
875 _LIBCPP_INLINE_VISIBILITY front_insert_iterator operator++(int) {return *this;}
878 template <class _Container>
879 inline _LIBCPP_INLINE_VISIBILITY
880 front_insert_iterator<_Container>
881 front_inserter(_Container& __x)
883 return front_insert_iterator<_Container>(__x);
886 template <class _Container>
887 class _LIBCPP_TEMPLATE_VIS insert_iterator
888 : public iterator<output_iterator_tag,
895 _Container* container;
896 typename _Container::iterator iter;
898 typedef _Container container_type;
900 _LIBCPP_INLINE_VISIBILITY insert_iterator(_Container& __x, typename _Container::iterator __i)
901 : container(_VSTD::addressof(__x)), iter(__i) {}
902 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(const typename _Container::value_type& __value_)
903 {iter = container->insert(iter, __value_); ++iter; return *this;}
904 #ifndef _LIBCPP_CXX03_LANG
905 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(typename _Container::value_type&& __value_)
906 {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;}
907 #endif // _LIBCPP_CXX03_LANG
908 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator*() {return *this;}
909 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++() {return *this;}
910 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++(int) {return *this;}
913 template <class _Container>
914 inline _LIBCPP_INLINE_VISIBILITY
915 insert_iterator<_Container>
916 inserter(_Container& __x, typename _Container::iterator __i)
918 return insert_iterator<_Container>(__x, __i);
921 template <class _Tp, class _CharT = char,
922 class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t>
923 class _LIBCPP_TEMPLATE_VIS istream_iterator
924 : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&>
927 typedef _CharT char_type;
928 typedef _Traits traits_type;
929 typedef basic_istream<_CharT,_Traits> istream_type;
931 istream_type* __in_stream_;
934 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(0), __value_() {}
935 _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s))
937 if (!(*__in_stream_ >> __value_))
941 _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;}
942 _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));}
943 _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++()
945 if (!(*__in_stream_ >> __value_))
949 _LIBCPP_INLINE_VISIBILITY istream_iterator operator++(int)
950 {istream_iterator __t(*this); ++(*this); return __t;}
952 template <class _Up, class _CharU, class _TraitsU, class _DistanceU>
953 friend _LIBCPP_INLINE_VISIBILITY
955 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x,
956 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y);
958 template <class _Up, class _CharU, class _TraitsU, class _DistanceU>
959 friend _LIBCPP_INLINE_VISIBILITY
961 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x,
962 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y);
965 template <class _Tp, class _CharT, class _Traits, class _Distance>
966 inline _LIBCPP_INLINE_VISIBILITY
968 operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
969 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y)
971 return __x.__in_stream_ == __y.__in_stream_;
974 template <class _Tp, class _CharT, class _Traits, class _Distance>
975 inline _LIBCPP_INLINE_VISIBILITY
977 operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
978 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y)
980 return !(__x == __y);
983 template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT> >
984 class _LIBCPP_TEMPLATE_VIS ostream_iterator
985 : public iterator<output_iterator_tag, void, void, void, void>
988 typedef _CharT char_type;
989 typedef _Traits traits_type;
990 typedef basic_ostream<_CharT,_Traits> ostream_type;
992 ostream_type* __out_stream_;
993 const char_type* __delim_;
995 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s) _NOEXCEPT
996 : __out_stream_(_VSTD::addressof(__s)), __delim_(0) {}
997 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter) _NOEXCEPT
998 : __out_stream_(_VSTD::addressof(__s)), __delim_(__delimiter) {}
999 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator=(const _Tp& __value_)
1001 *__out_stream_ << __value_;
1003 *__out_stream_ << __delim_;
1007 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator*() {return *this;}
1008 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++() {return *this;}
1009 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++(int) {return *this;}
1012 template<class _CharT, class _Traits>
1013 class _LIBCPP_TEMPLATE_VIS istreambuf_iterator
1014 : public iterator<input_iterator_tag, _CharT,
1015 typename _Traits::off_type, _CharT*,
1019 typedef _CharT char_type;
1020 typedef _Traits traits_type;
1021 typedef typename _Traits::int_type int_type;
1022 typedef basic_streambuf<_CharT,_Traits> streambuf_type;
1023 typedef basic_istream<_CharT,_Traits> istream_type;
1025 mutable streambuf_type* __sbuf_;
1030 streambuf_type* __sbuf_;
1031 _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s)
1032 : __keep_(__c), __sbuf_(__s) {}
1033 friend class istreambuf_iterator;
1035 _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;}
1038 _LIBCPP_INLINE_VISIBILITY
1039 bool __test_for_eof() const
1041 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof()))
1043 return __sbuf_ == 0;
1046 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(0) {}
1047 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT
1048 : __sbuf_(__s.rdbuf()) {}
1049 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT
1051 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT
1052 : __sbuf_(__p.__sbuf_) {}
1054 _LIBCPP_INLINE_VISIBILITY char_type operator*() const
1055 {return static_cast<char_type>(__sbuf_->sgetc());}
1056 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++()
1061 _LIBCPP_INLINE_VISIBILITY __proxy operator++(int)
1063 return __proxy(__sbuf_->sbumpc(), __sbuf_);
1066 _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const
1067 {return __test_for_eof() == __b.__test_for_eof();}
1070 template <class _CharT, class _Traits>
1071 inline _LIBCPP_INLINE_VISIBILITY
1072 bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a,
1073 const istreambuf_iterator<_CharT,_Traits>& __b)
1074 {return __a.equal(__b);}
1076 template <class _CharT, class _Traits>
1077 inline _LIBCPP_INLINE_VISIBILITY
1078 bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a,
1079 const istreambuf_iterator<_CharT,_Traits>& __b)
1080 {return !__a.equal(__b);}
1082 template <class _CharT, class _Traits>
1083 class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator
1084 : public iterator<output_iterator_tag, void, void, void, void>
1087 typedef _CharT char_type;
1088 typedef _Traits traits_type;
1089 typedef basic_streambuf<_CharT,_Traits> streambuf_type;
1090 typedef basic_ostream<_CharT,_Traits> ostream_type;
1092 streambuf_type* __sbuf_;
1094 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) _NOEXCEPT
1095 : __sbuf_(__s.rdbuf()) {}
1096 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT
1098 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c)
1100 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof()))
1104 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*() {return *this;}
1105 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++() {return *this;}
1106 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;}
1107 _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == 0;}
1109 template <class _Ch, class _Tr>
1112 ostreambuf_iterator<_Ch, _Tr>
1113 __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s,
1114 const _Ch* __ob, const _Ch* __op, const _Ch* __oe,
1115 ios_base& __iob, _Ch __fl);
1118 template <class _Iter>
1119 class _LIBCPP_TEMPLATE_VIS move_iterator
1124 typedef _Iter iterator_type;
1125 typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
1126 typedef typename iterator_traits<iterator_type>::value_type value_type;
1127 typedef typename iterator_traits<iterator_type>::difference_type difference_type;
1128 typedef iterator_type pointer;
1129 #ifndef _LIBCPP_CXX03_LANG
1130 typedef typename iterator_traits<iterator_type>::reference __reference;
1131 typedef typename conditional<
1132 is_reference<__reference>::value,
1133 typename remove_reference<__reference>::type&&,
1137 typedef typename iterator_traits<iterator_type>::reference reference;
1140 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1141 move_iterator() : __i() {}
1142 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1143 explicit move_iterator(_Iter __x) : __i(__x) {}
1144 template <class _Up>
1145 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1146 move_iterator(const move_iterator<_Up>& __u) : __i(__u.base()) {}
1147 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 _Iter base() const {return __i;}
1148 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1149 reference operator*() const { return static_cast<reference>(*__i); }
1150 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1151 pointer operator->() const { return __i;}
1152 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1153 move_iterator& operator++() {++__i; return *this;}
1154 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1155 move_iterator operator++(int) {move_iterator __tmp(*this); ++__i; return __tmp;}
1156 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1157 move_iterator& operator--() {--__i; return *this;}
1158 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1159 move_iterator operator--(int) {move_iterator __tmp(*this); --__i; return __tmp;}
1160 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1161 move_iterator operator+ (difference_type __n) const {return move_iterator(__i + __n);}
1162 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1163 move_iterator& operator+=(difference_type __n) {__i += __n; return *this;}
1164 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1165 move_iterator operator- (difference_type __n) const {return move_iterator(__i - __n);}
1166 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1167 move_iterator& operator-=(difference_type __n) {__i -= __n; return *this;}
1168 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1169 reference operator[](difference_type __n) const { return static_cast<reference>(__i[__n]); }
1172 template <class _Iter1, class _Iter2>
1173 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1175 operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1177 return __x.base() == __y.base();
1180 template <class _Iter1, class _Iter2>
1181 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1183 operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1185 return __x.base() < __y.base();
1188 template <class _Iter1, class _Iter2>
1189 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1191 operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1193 return __x.base() != __y.base();
1196 template <class _Iter1, class _Iter2>
1197 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1199 operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1201 return __x.base() > __y.base();
1204 template <class _Iter1, class _Iter2>
1205 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1207 operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1209 return __x.base() >= __y.base();
1212 template <class _Iter1, class _Iter2>
1213 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1215 operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1217 return __x.base() <= __y.base();
1220 #ifndef _LIBCPP_CXX03_LANG
1221 template <class _Iter1, class _Iter2>
1222 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1224 operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1225 -> decltype(__x.base() - __y.base())
1227 return __x.base() - __y.base();
1230 template <class _Iter1, class _Iter2>
1231 inline _LIBCPP_INLINE_VISIBILITY
1232 typename move_iterator<_Iter1>::difference_type
1233 operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1235 return __x.base() - __y.base();
1239 template <class _Iter>
1240 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1241 move_iterator<_Iter>
1242 operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x)
1244 return move_iterator<_Iter>(__x.base() + __n);
1247 template <class _Iter>
1248 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1249 move_iterator<_Iter>
1250 make_move_iterator(_Iter __i)
1252 return move_iterator<_Iter>(__i);
1257 template <class _Iter> class __wrap_iter;
1259 template <class _Iter1, class _Iter2>
1260 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1262 operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1264 template <class _Iter1, class _Iter2>
1265 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1267 operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1269 template <class _Iter1, class _Iter2>
1270 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1272 operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1274 template <class _Iter1, class _Iter2>
1275 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1277 operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1279 template <class _Iter1, class _Iter2>
1280 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1282 operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1284 template <class _Iter1, class _Iter2>
1285 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1287 operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1289 #ifndef _LIBCPP_CXX03_LANG
1290 template <class _Iter1, class _Iter2>
1291 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1293 operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1294 -> decltype(__x.base() - __y.base());
1296 template <class _Iter1, class _Iter2>
1297 _LIBCPP_INLINE_VISIBILITY
1298 typename __wrap_iter<_Iter1>::difference_type
1299 operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1302 template <class _Iter>
1303 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1305 operator+(typename __wrap_iter<_Iter>::difference_type, __wrap_iter<_Iter>) _NOEXCEPT;
1307 template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY copy(_Ip, _Ip, _Op);
1308 template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY copy_backward(_B1, _B1, _B2);
1309 template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY move(_Ip, _Ip, _Op);
1310 template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY move_backward(_B1, _B1, _B2);
1312 #if _LIBCPP_DEBUG_LEVEL < 2
1314 template <class _Tp>
1315 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1318 is_trivially_copy_assignable<_Tp>::value,
1321 __unwrap_iter(__wrap_iter<_Tp*>);
1325 template <class _Tp>
1326 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1329 is_trivially_copy_assignable<_Tp>::value,
1332 __unwrap_iter(__wrap_iter<_Tp*> __i);
1336 template <class _Iter>
1340 typedef _Iter iterator_type;
1341 typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
1342 typedef typename iterator_traits<iterator_type>::value_type value_type;
1343 typedef typename iterator_traits<iterator_type>::difference_type difference_type;
1344 typedef typename iterator_traits<iterator_type>::pointer pointer;
1345 typedef typename iterator_traits<iterator_type>::reference reference;
1349 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter() _NOEXCEPT
1350 #if _LIBCPP_STD_VER > 11
1354 #if _LIBCPP_DEBUG_LEVEL >= 2
1355 __get_db()->__insert_i(this);
1358 template <class _Up> _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1359 __wrap_iter(const __wrap_iter<_Up>& __u,
1360 typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = 0) _NOEXCEPT
1363 #if _LIBCPP_DEBUG_LEVEL >= 2
1364 __get_db()->__iterator_copy(this, &__u);
1367 #if _LIBCPP_DEBUG_LEVEL >= 2
1368 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1369 __wrap_iter(const __wrap_iter& __x)
1372 __get_db()->__iterator_copy(this, &__x);
1374 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1375 __wrap_iter& operator=(const __wrap_iter& __x)
1379 __get_db()->__iterator_copy(this, &__x);
1384 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1387 __get_db()->__erase_i(this);
1390 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator*() const _NOEXCEPT
1392 #if _LIBCPP_DEBUG_LEVEL >= 2
1393 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1394 "Attempted to dereference a non-dereferenceable iterator");
1398 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG pointer operator->() const _NOEXCEPT
1400 #if _LIBCPP_DEBUG_LEVEL >= 2
1401 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1402 "Attempted to dereference a non-dereferenceable iterator");
1404 return (pointer)_VSTD::addressof(*__i);
1406 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator++() _NOEXCEPT
1408 #if _LIBCPP_DEBUG_LEVEL >= 2
1409 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1410 "Attempted to increment non-incrementable iterator");
1415 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator++(int) _NOEXCEPT
1416 {__wrap_iter __tmp(*this); ++(*this); return __tmp;}
1418 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator--() _NOEXCEPT
1420 #if _LIBCPP_DEBUG_LEVEL >= 2
1421 _LIBCPP_ASSERT(__get_const_db()->__decrementable(this),
1422 "Attempted to decrement non-decrementable iterator");
1427 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator--(int) _NOEXCEPT
1428 {__wrap_iter __tmp(*this); --(*this); return __tmp;}
1429 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator+ (difference_type __n) const _NOEXCEPT
1430 {__wrap_iter __w(*this); __w += __n; return __w;}
1431 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator+=(difference_type __n) _NOEXCEPT
1433 #if _LIBCPP_DEBUG_LEVEL >= 2
1434 _LIBCPP_ASSERT(__get_const_db()->__addable(this, __n),
1435 "Attempted to add/subtract iterator outside of valid range");
1440 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator- (difference_type __n) const _NOEXCEPT
1441 {return *this + (-__n);}
1442 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator-=(difference_type __n) _NOEXCEPT
1443 {*this += -__n; return *this;}
1444 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator[](difference_type __n) const _NOEXCEPT
1446 #if _LIBCPP_DEBUG_LEVEL >= 2
1447 _LIBCPP_ASSERT(__get_const_db()->__subscriptable(this, __n),
1448 "Attempted to subscript iterator outside of valid range");
1453 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG iterator_type base() const _NOEXCEPT {return __i;}
1456 #if _LIBCPP_DEBUG_LEVEL >= 2
1457 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(const void* __p, iterator_type __x) : __i(__x)
1459 __get_db()->__insert_ic(this, __p);
1462 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {}
1465 template <class _Up> friend class __wrap_iter;
1466 template <class _CharT, class _Traits, class _Alloc> friend class basic_string;
1467 template <class _Tp, class _Alloc> friend class _LIBCPP_TEMPLATE_VIS vector;
1468 template <class _Tp, size_t> friend class _LIBCPP_TEMPLATE_VIS span;
1470 template <class _Iter1, class _Iter2>
1471 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1473 operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1475 template <class _Iter1, class _Iter2>
1476 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1478 operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1480 template <class _Iter1, class _Iter2>
1481 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1483 operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1485 template <class _Iter1, class _Iter2>
1486 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1488 operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1490 template <class _Iter1, class _Iter2>
1491 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1493 operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1495 template <class _Iter1, class _Iter2>
1496 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1498 operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1500 #ifndef _LIBCPP_CXX03_LANG
1501 template <class _Iter1, class _Iter2>
1502 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1504 operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1505 -> decltype(__x.base() - __y.base());
1507 template <class _Iter1, class _Iter2>
1508 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1509 typename __wrap_iter<_Iter1>::difference_type
1510 operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1513 template <class _Iter1>
1514 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1516 operator+(typename __wrap_iter<_Iter1>::difference_type, __wrap_iter<_Iter1>) _NOEXCEPT;
1518 template <class _Ip, class _Op> friend _Op copy(_Ip, _Ip, _Op);
1519 template <class _B1, class _B2> friend _B2 copy_backward(_B1, _B1, _B2);
1520 template <class _Ip, class _Op> friend _Op move(_Ip, _Ip, _Op);
1521 template <class _B1, class _B2> friend _B2 move_backward(_B1, _B1, _B2);
1523 #if _LIBCPP_DEBUG_LEVEL < 2
1524 template <class _Tp>
1525 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1528 is_trivially_copy_assignable<_Tp>::value,
1531 __unwrap_iter(__wrap_iter<_Tp*>);
1533 template <class _Tp>
1534 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1537 is_trivially_copy_assignable<_Tp>::value,
1540 __unwrap_iter(__wrap_iter<_Tp*> __i);
1544 template <class _Iter1, class _Iter2>
1545 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1547 operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1549 return __x.base() == __y.base();
1552 template <class _Iter1, class _Iter2>
1553 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1555 operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1557 #if _LIBCPP_DEBUG_LEVEL >= 2
1558 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1559 "Attempted to compare incomparable iterators");
1561 return __x.base() < __y.base();
1564 template <class _Iter1, class _Iter2>
1565 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1567 operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1569 return !(__x == __y);
1572 template <class _Iter1, class _Iter2>
1573 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1575 operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1580 template <class _Iter1, class _Iter2>
1581 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1583 operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1585 return !(__x < __y);
1588 template <class _Iter1, class _Iter2>
1589 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1591 operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1593 return !(__y < __x);
1596 template <class _Iter1>
1597 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1599 operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1601 return !(__x == __y);
1604 template <class _Iter1>
1605 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1607 operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1612 template <class _Iter1>
1613 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1615 operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1617 return !(__x < __y);
1620 template <class _Iter1>
1621 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1623 operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1625 return !(__y < __x);
1628 #ifndef _LIBCPP_CXX03_LANG
1629 template <class _Iter1, class _Iter2>
1630 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1632 operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1633 -> decltype(__x.base() - __y.base())
1635 #if _LIBCPP_DEBUG_LEVEL >= 2
1636 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1637 "Attempted to subtract incompatible iterators");
1639 return __x.base() - __y.base();
1642 template <class _Iter1, class _Iter2>
1643 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1644 typename __wrap_iter<_Iter1>::difference_type
1645 operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1647 #if _LIBCPP_DEBUG_LEVEL >= 2
1648 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1649 "Attempted to subtract incompatible iterators");
1651 return __x.base() - __y.base();
1655 template <class _Iter>
1656 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1658 operator+(typename __wrap_iter<_Iter>::difference_type __n,
1659 __wrap_iter<_Iter> __x) _NOEXCEPT
1665 template <class _Iter>
1666 struct __libcpp_is_trivial_iterator
1667 : public _LIBCPP_BOOL_CONSTANT(is_pointer<_Iter>::value) {};
1669 template <class _Iter>
1670 struct __libcpp_is_trivial_iterator<move_iterator<_Iter> >
1671 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
1673 template <class _Iter>
1674 struct __libcpp_is_trivial_iterator<reverse_iterator<_Iter> >
1675 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
1677 template <class _Iter>
1678 struct __libcpp_is_trivial_iterator<__wrap_iter<_Iter> >
1679 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
1682 template <class _Tp, size_t _Np>
1683 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1685 begin(_Tp (&__array)[_Np])
1690 template <class _Tp, size_t _Np>
1691 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1693 end(_Tp (&__array)[_Np])
1695 return __array + _Np;
1698 #if !defined(_LIBCPP_CXX03_LANG)
1700 template <class _Cp>
1701 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1703 begin(_Cp& __c) -> decltype(__c.begin())
1708 template <class _Cp>
1709 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1711 begin(const _Cp& __c) -> decltype(__c.begin())
1716 template <class _Cp>
1717 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1719 end(_Cp& __c) -> decltype(__c.end())
1724 template <class _Cp>
1725 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1727 end(const _Cp& __c) -> decltype(__c.end())
1732 #if _LIBCPP_STD_VER > 11
1734 template <class _Tp, size_t _Np>
1735 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1736 reverse_iterator<_Tp*> rbegin(_Tp (&__array)[_Np])
1738 return reverse_iterator<_Tp*>(__array + _Np);
1741 template <class _Tp, size_t _Np>
1742 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1743 reverse_iterator<_Tp*> rend(_Tp (&__array)[_Np])
1745 return reverse_iterator<_Tp*>(__array);
1748 template <class _Ep>
1749 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1750 reverse_iterator<const _Ep*> rbegin(initializer_list<_Ep> __il)
1752 return reverse_iterator<const _Ep*>(__il.end());
1755 template <class _Ep>
1756 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1757 reverse_iterator<const _Ep*> rend(initializer_list<_Ep> __il)
1759 return reverse_iterator<const _Ep*>(__il.begin());
1762 template <class _Cp>
1763 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1764 auto cbegin(const _Cp& __c) -> decltype(_VSTD::begin(__c))
1766 return _VSTD::begin(__c);
1769 template <class _Cp>
1770 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1771 auto cend(const _Cp& __c) -> decltype(_VSTD::end(__c))
1773 return _VSTD::end(__c);
1776 template <class _Cp>
1777 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1778 auto rbegin(_Cp& __c) -> decltype(__c.rbegin())
1780 return __c.rbegin();
1783 template <class _Cp>
1784 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1785 auto rbegin(const _Cp& __c) -> decltype(__c.rbegin())
1787 return __c.rbegin();
1790 template <class _Cp>
1791 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1792 auto rend(_Cp& __c) -> decltype(__c.rend())
1797 template <class _Cp>
1798 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1799 auto rend(const _Cp& __c) -> decltype(__c.rend())
1804 template <class _Cp>
1805 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1806 auto crbegin(const _Cp& __c) -> decltype(_VSTD::rbegin(__c))
1808 return _VSTD::rbegin(__c);
1811 template <class _Cp>
1812 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1813 auto crend(const _Cp& __c) -> decltype(_VSTD::rend(__c))
1815 return _VSTD::rend(__c);
1821 #else // defined(_LIBCPP_CXX03_LANG)
1823 template <class _Cp>
1824 _LIBCPP_INLINE_VISIBILITY
1825 typename _Cp::iterator
1831 template <class _Cp>
1832 _LIBCPP_INLINE_VISIBILITY
1833 typename _Cp::const_iterator
1834 begin(const _Cp& __c)
1839 template <class _Cp>
1840 _LIBCPP_INLINE_VISIBILITY
1841 typename _Cp::iterator
1847 template <class _Cp>
1848 _LIBCPP_INLINE_VISIBILITY
1849 typename _Cp::const_iterator
1855 #endif // !defined(_LIBCPP_CXX03_LANG)
1857 #if _LIBCPP_STD_VER > 14
1859 // #if _LIBCPP_STD_VER > 11
1861 // struct _LIBCPP_TEMPLATE_VIS plus<void>
1863 // template <class _T1, class _T2>
1864 // _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
1865 // auto operator()(_T1&& __t, _T2&& __u) const
1866 // _NOEXCEPT_(noexcept(_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u)))
1867 // -> decltype (_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u))
1868 // { return _VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u); }
1869 // typedef void is_transparent;
1873 template <class _Cont>
1874 _LIBCPP_INLINE_VISIBILITY
1875 constexpr auto size(const _Cont& __c)
1876 _NOEXCEPT_(noexcept(__c.size()))
1877 -> decltype (__c.size())
1878 { return __c.size(); }
1880 template <class _Tp, size_t _Sz>
1881 _LIBCPP_INLINE_VISIBILITY
1882 constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; }
1884 #if _LIBCPP_STD_VER > 17
1885 template <class _Cont>
1886 _LIBCPP_INLINE_VISIBILITY
1887 constexpr auto ssize(const _Cont& __c)
1888 _NOEXCEPT_(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size())))
1889 -> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>
1890 { return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); }
1892 template <class _Tp, ptrdiff_t _Sz>
1893 _LIBCPP_INLINE_VISIBILITY
1894 constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { return _Sz; }
1897 template <class _Cont>
1898 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
1899 constexpr auto empty(const _Cont& __c)
1900 _NOEXCEPT_(noexcept(__c.empty()))
1901 -> decltype (__c.empty())
1902 { return __c.empty(); }
1904 template <class _Tp, size_t _Sz>
1905 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
1906 constexpr bool empty(const _Tp (&)[_Sz]) noexcept { return false; }
1908 template <class _Ep>
1909 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
1910 constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; }
1912 template <class _Cont> constexpr
1913 _LIBCPP_INLINE_VISIBILITY
1914 auto data(_Cont& __c)
1915 _NOEXCEPT_(noexcept(__c.data()))
1916 -> decltype (__c.data())
1917 { return __c.data(); }
1919 template <class _Cont> constexpr
1920 _LIBCPP_INLINE_VISIBILITY
1921 auto data(const _Cont& __c)
1922 _NOEXCEPT_(noexcept(__c.data()))
1923 -> decltype (__c.data())
1924 { return __c.data(); }
1926 template <class _Tp, size_t _Sz>
1927 _LIBCPP_INLINE_VISIBILITY
1928 constexpr _Tp* data(_Tp (&__array)[_Sz]) noexcept { return __array; }
1930 template <class _Ep>
1931 _LIBCPP_INLINE_VISIBILITY
1932 constexpr const _Ep* data(initializer_list<_Ep> __il) noexcept { return __il.begin(); }
1936 _LIBCPP_END_NAMESPACE_STD
1938 #endif // _LIBCPP_ITERATOR