1// -*- C++ -*-
2//===-------------------------- iterator ----------------------------------===//
3//
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
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_ITERATOR
11#define _LIBCPP_ITERATOR
12
13/*
14 iterator synopsis
15
16namespace std
17{
18
19template<class Iterator>
20struct iterator_traits
21{
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;
27};
28
29template<class T>
30struct iterator_traits<T*>
31{
32 typedef ptrdiff_t difference_type;
33 typedef T value_type;
34 typedef T* pointer;
35 typedef T& reference;
36 typedef random_access_iterator_tag iterator_category;
37};
38
39template<class Category, class T, class Distance = ptrdiff_t,
40 class Pointer = T*, class Reference = T&>
41struct iterator
42{
43 typedef T value_type;
44 typedef Distance difference_type;
45 typedef Pointer pointer;
46 typedef Reference reference;
47 typedef Category iterator_category;
48};
49
50struct input_iterator_tag {};
51struct output_iterator_tag {};
52struct forward_iterator_tag : public input_iterator_tag {};
53struct bidirectional_iterator_tag : public forward_iterator_tag {};
54struct random_access_iterator_tag : public bidirectional_iterator_tag {};
55
56// 27.4.3, iterator operations
57// extension: second argument not conforming to C++03
58template <class InputIterator> // constexpr in C++17
59 constexpr void advance(InputIterator& i,
60 typename iterator_traits<InputIterator>::difference_type n);
61
62template <class InputIterator> // constexpr in C++17
63 constexpr typename iterator_traits<InputIterator>::difference_type
64 distance(InputIterator first, InputIterator last);
65
66template <class InputIterator> // constexpr in C++17
67 constexpr InputIterator next(InputIterator x,
68typename iterator_traits<InputIterator>::difference_type n = 1);
69
70template <class BidirectionalIterator> // constexpr in C++17
71 constexpr BidirectionalIterator prev(BidirectionalIterator x,
72 typename iterator_traits<BidirectionalIterator>::difference_type n = 1);
73
74template <class Iterator>
75class 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>
81{
82protected:
83 Iterator current;
84public:
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;
89
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;
106};
107
108template <class Iterator1, class Iterator2>
109constexpr bool // constexpr in C++17
110operator==(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
111
112template <class Iterator1, class Iterator2>
113constexpr bool // constexpr in C++17
114operator<(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
115
116template <class Iterator1, class Iterator2>
117constexpr bool // constexpr in C++17
118operator!=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
119
120template <class Iterator1, class Iterator2>
121constexpr bool // constexpr in C++17
122operator>(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
123
124template <class Iterator1, class Iterator2>
125constexpr bool // constexpr in C++17
126operator>=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
127
128template <class Iterator1, class Iterator2>
129constexpr bool // constexpr in C++17
130operator<=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
131
132template <class Iterator1, class Iterator2>
133constexpr auto
134operator-(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y)
135-> decltype(__y.base() - __x.base()); // constexpr in C++17
136
137template <class Iterator>
138constexpr reverse_iterator<Iterator>
139operator+(typename reverse_iterator<Iterator>::difference_type n,
140 const reverse_iterator<Iterator>& x); // constexpr in C++17
141
142template <class Iterator>
143constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i); // C++14, constexpr in C++17
144
145template <class Container>
146class back_insert_iterator
147{
148protected:
149 Container* container;
150public:
151 typedef Container container_type;
152 typedef void value_type;
153 typedef void difference_type;
154 typedef void reference;
155 typedef void pointer;
156
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);
162};
163
164template <class Container> back_insert_iterator<Container> back_inserter(Container& x);
165
166template <class Container>
167class front_insert_iterator
168{
169protected:
170 Container* container;
171public:
172 typedef Container container_type;
173 typedef void value_type;
174 typedef void difference_type;
175 typedef void reference;
176 typedef void pointer;
177
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);
183};
184
185template <class Container> front_insert_iterator<Container> front_inserter(Container& x);
186
187template <class Container>
188class insert_iterator
189{
190protected:
191 Container* container;
192 typename Container::iterator iter;
193public:
194 typedef Container container_type;
195 typedef void value_type;
196 typedef void difference_type;
197 typedef void reference;
198 typedef void pointer;
199
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);
205};
206
207template <class Container, class Iterator>
208insert_iterator<Container> inserter(Container& x, Iterator i);
209
210template <class Iterator>
211class move_iterator {
212public:
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;
219
220 constexpr move_iterator(); // all the constexprs are in C++17
221 constexpr explicit move_iterator(Iterator i);
222 template <class U>
223 constexpr move_iterator(const move_iterator<U>& u);
224 template <class 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;
238private:
239 Iterator current; // exposition only
240};
241
242template <class Iterator1, class Iterator2>
243constexpr bool // constexpr in C++17
244operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
245
246template <class Iterator1, class Iterator2>
247constexpr bool // constexpr in C++17
248operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
249
250template <class Iterator1, class Iterator2>
251constexpr bool // constexpr in C++17
252operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
253
254template <class Iterator1, class Iterator2>
255constexpr bool // constexpr in C++17
256operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
257
258template <class Iterator1, class Iterator2>
259constexpr bool // constexpr in C++17
260operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
261
262template <class Iterator1, class Iterator2>
263constexpr bool // constexpr in C++17
264operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
265
266template <class Iterator1, class Iterator2>
267constexpr auto // constexpr in C++17
268operator-(const move_iterator<Iterator1>& x,
269 const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base());
270
271template <class Iterator>
272constexpr move_iterator<Iterator> operator+( // constexpr in C++17
273 typename move_iterator<Iterator>::difference_type n,
274 const move_iterator<Iterator>& x);
275
276template <class Iterator> // constexpr in C++17
277constexpr move_iterator<Iterator> make_move_iterator(const Iterator& i);
278
279
280template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t>
281class istream_iterator
282 : public iterator<input_iterator_tag, T, Distance, const T*, const T&>
283{
284public:
285 typedef charT char_type;
286 typedef traits traits_type;
287 typedef basic_istream<charT,traits> istream_type;
288
289 constexpr istream_iterator();
290 istream_iterator(istream_type& s);
291 istream_iterator(const istream_iterator& x);
292 ~istream_iterator();
293
294 const T& operator*() const;
295 const T* operator->() const;
296 istream_iterator& operator++();
297 istream_iterator operator++(int);
298};
299
300template <class T, class charT, class traits, class Distance>
301bool operator==(const istream_iterator<T,charT,traits,Distance>& x,
302 const istream_iterator<T,charT,traits,Distance>& y);
303template <class T, class charT, class traits, class Distance>
304bool operator!=(const istream_iterator<T,charT,traits,Distance>& x,
305 const istream_iterator<T,charT,traits,Distance>& y);
306
307template <class T, class charT = char, class traits = char_traits<charT> >
308class ostream_iterator
309 : public iterator<output_iterator_tag, void, void, void ,void>
310{
311public:
312 typedef charT char_type;
313 typedef traits traits_type;
314 typedef basic_ostream<charT,traits> ostream_type;
315
316 ostream_iterator(ostream_type& s);
317 ostream_iterator(ostream_type& s, const charT* delimiter);
318 ostream_iterator(const ostream_iterator& x);
319 ~ostream_iterator();
320 ostream_iterator& operator=(const T& value);
321
322 ostream_iterator& operator*();
323 ostream_iterator& operator++();
324 ostream_iterator& operator++(int);
325};
326
327template<class charT, class traits = char_traits<charT> >
328class istreambuf_iterator
329 : public iterator<input_iterator_tag, charT,
330 typename traits::off_type, unspecified,
331 charT>
332{
333public:
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;
339
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;
344
345 charT operator*() const;
346 pointer operator->() const;
347 istreambuf_iterator& operator++();
348 a-private-type operator++(int);
349
350 bool equal(const istreambuf_iterator& b) const;
351};
352
353template <class charT, class traits>
354bool operator==(const istreambuf_iterator<charT,traits>& a,
355 const istreambuf_iterator<charT,traits>& b);
356template <class charT, class traits>
357bool operator!=(const istreambuf_iterator<charT,traits>& a,
358 const istreambuf_iterator<charT,traits>& b);
359
360template <class charT, class traits = char_traits<charT> >
361class ostreambuf_iterator
362 : public iterator<output_iterator_tag, void, void, void, void>
363{
364public:
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;
369
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;
377};
378
379template <class C> constexpr auto begin(C& c) -> decltype(c.begin());
380template <class C> constexpr auto begin(const C& c) -> decltype(c.begin());
381template <class C> constexpr auto end(C& c) -> decltype(c.end());
382template <class C> constexpr auto end(const C& c) -> decltype(c.end());
383template <class T, size_t N> constexpr T* begin(T (&array)[N]);
384template <class T, size_t N> constexpr T* end(T (&array)[N]);
385
386template <class C> auto constexpr cbegin(const C& c) -> decltype(std::begin(c)); // C++14
387template <class C> auto constexpr cend(const C& c) -> decltype(std::end(c)); // C++14
388template <class C> auto constexpr rbegin(C& c) -> decltype(c.rbegin()); // C++14
389template <class C> auto constexpr rbegin(const C& c) -> decltype(c.rbegin()); // C++14
390template <class C> auto constexpr rend(C& c) -> decltype(c.rend()); // C++14
391template <class C> constexpr auto rend(const C& c) -> decltype(c.rend()); // C++14
392template <class E> reverse_iterator<const E*> constexpr rbegin(initializer_list<E> il); // C++14
393template <class E> reverse_iterator<const E*> constexpr rend(initializer_list<E> il); // C++14
394template <class T, size_t N> reverse_iterator<T*> constexpr rbegin(T (&array)[N]); // C++14
395template <class T, size_t N> reverse_iterator<T*> constexpr rend(T (&array)[N]); // C++14
396template <class C> constexpr auto crbegin(const C& c) -> decltype(std::rbegin(c)); // C++14
397template <class C> constexpr auto crend(const C& c) -> decltype(std::rend(c)); // C++14
398
399// 24.8, container access:
400template <class C> constexpr auto size(const C& c) -> decltype(c.size()); // C++17
401template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17
402
403template <class C> constexpr auto ssize(const C& c)
404 -> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size())>>; // C++20
405template <class T, ptrdiff_t> constexpr ptrdiff_t ssize(const T (&array)[N]) noexcept; // C++20
406
407template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17
408template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17
409template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17
410template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17
411template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17
412template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17
413template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17
414
415} // std
416
417*/
418
419#include <__config>
420#include <iosfwd> // for forward declarations of vector and string.
421#include <__functional_base>
422#include <type_traits>
423#include <cstddef>
424#include <initializer_list>
425#include <version>
426#ifdef __APPLE__
427#include <Availability.h>
428#endif
429
430#include <__debug>
431
432#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
433#pragma GCC system_header
434#endif
435
436_LIBCPP_BEGIN_NAMESPACE_STD
437template <class _Iter>
438struct _LIBCPP_TEMPLATE_VIS iterator_traits;
439
440struct _LIBCPP_TEMPLATE_VIS input_iterator_tag {};
441struct _LIBCPP_TEMPLATE_VIS output_iterator_tag {};
442struct _LIBCPP_TEMPLATE_VIS forward_iterator_tag : public input_iterator_tag {};
443struct _LIBCPP_TEMPLATE_VIS bidirectional_iterator_tag : public forward_iterator_tag {};
444struct _LIBCPP_TEMPLATE_VIS random_access_iterator_tag : public bidirectional_iterator_tag {};
445#if _LIBCPP_STD_VER > 17
446// TODO(EricWF) contiguous_iterator_tag is provided as an extension prior to
447// C++20 to allow optimizations for users providing wrapped iterator types.
448struct _LIBCPP_TEMPLATE_VIS contiguous_iterator_tag: public random_access_iterator_tag { };
449#endif
450
451template <class _Iter>
452struct __iter_traits_cache {
453 using type = _If<
454 __is_primary_template<iterator_traits<_Iter> >::value,
455 _Iter,
456 iterator_traits<_Iter>
457 >;
458};
459template <class _Iter>
460using _ITER_TRAITS = typename __iter_traits_cache<_Iter>::type;
461
462struct __iter_concept_concept_test {
463 template <class _Iter>
464 using _Apply = typename _ITER_TRAITS<_Iter>::iterator_concept;
465};
466struct __iter_concept_category_test {
467 template <class _Iter>
468 using _Apply = typename _ITER_TRAITS<_Iter>::iterator_category;
469};
470struct __iter_concept_random_fallback {
471 template <class _Iter>
472 using _Apply = _EnableIf<
473 __is_primary_template<iterator_traits<_Iter> >::value,
474 random_access_iterator_tag
475 >;
476};
477
478template <class _Iter, class _Tester> struct __test_iter_concept
479 : _IsValidExpansion<_Tester::template _Apply, _Iter>,
480 _Tester
481{
482};
483
484template <class _Iter>
485struct __iter_concept_cache {
486 using type = _Or<
487 __test_iter_concept<_Iter, __iter_concept_concept_test>,
488 __test_iter_concept<_Iter, __iter_concept_category_test>,
489 __test_iter_concept<_Iter, __iter_concept_random_fallback>
490 >;
491};
492
493template <class _Iter>
494using _ITER_CONCEPT = typename __iter_concept_cache<_Iter>::type::template _Apply<_Iter>;
495
496
497template <class _Tp>
498struct __has_iterator_typedefs
499{
500private:
501 struct __two {char __lx; char __lxx;};
502 template <class _Up> static __two __test(...);
503 template <class _Up> static char __test(typename std::__void_t<typename _Up::iterator_category>::type* = 0,
504 typename std::__void_t<typename _Up::difference_type>::type* = 0,
505 typename std::__void_t<typename _Up::value_type>::type* = 0,
506 typename std::__void_t<typename _Up::reference>::type* = 0,
507 typename std::__void_t<typename _Up::pointer>::type* = 0
508 );
509public:
510 static const bool value = sizeof(__test<_Tp>(0,0,0,0,0)) == 1;
511};
512
513
514template <class _Tp>
515struct __has_iterator_category
516{
517private:
518 struct __two {char __lx; char __lxx;};
519 template <class _Up> static __two __test(...);
520 template <class _Up> static char __test(typename _Up::iterator_category* = 0);
521public:
522 static const bool value = sizeof(__test<_Tp>(0)) == 1;
523};
524
525template <class _Iter, bool> struct __iterator_traits_impl {};
526
527template <class _Iter>
528struct __iterator_traits_impl<_Iter, true>
529{
530 typedef typename _Iter::difference_type difference_type;
531 typedef typename _Iter::value_type value_type;
532 typedef typename _Iter::pointer pointer;
533 typedef typename _Iter::reference reference;
534 typedef typename _Iter::iterator_category iterator_category;
535};
536
537template <class _Iter, bool> struct __iterator_traits {};
538
539template <class _Iter>
540struct __iterator_traits<_Iter, true>
541 : __iterator_traits_impl
542 <
543 _Iter,
544 is_convertible<typename _Iter::iterator_category, input_iterator_tag>::value ||
545 is_convertible<typename _Iter::iterator_category, output_iterator_tag>::value
546 >
547{};
548
549// iterator_traits<Iterator> will only have the nested types if Iterator::iterator_category
550// exists. Else iterator_traits<Iterator> will be an empty class. This is a
551// conforming extension which allows some programs to compile and behave as
552// the client expects instead of failing at compile time.
553
554template <class _Iter>
555struct _LIBCPP_TEMPLATE_VIS iterator_traits
556 : __iterator_traits<_Iter, __has_iterator_typedefs<_Iter>::value> {
557
558 using __primary_template = iterator_traits;
559};
560
561template<class _Tp>
562struct _LIBCPP_TEMPLATE_VIS iterator_traits<_Tp*>
563{
564 typedef ptrdiff_t difference_type;
565 typedef typename remove_cv<_Tp>::type value_type;
566 typedef _Tp* pointer;
567 typedef _Tp& reference;
568 typedef random_access_iterator_tag iterator_category;
569#if _LIBCPP_STD_VER > 17
570 typedef contiguous_iterator_tag iterator_concept;
571#endif
572};
573
574template <class _Tp, class _Up, bool = __has_iterator_category<iterator_traits<_Tp> >::value>
575struct __has_iterator_category_convertible_to
576 : public integral_constant<bool, is_convertible<typename iterator_traits<_Tp>::iterator_category, _Up>::value>
577{};
578
579template <class _Tp, class _Up>
580struct __has_iterator_category_convertible_to<_Tp, _Up, false> : public false_type {};
581
582template <class _Tp>
583struct __is_cpp17_input_iterator : public __has_iterator_category_convertible_to<_Tp, input_iterator_tag> {};
584
585template <class _Tp>
586struct __is_cpp17_forward_iterator : public __has_iterator_category_convertible_to<_Tp, forward_iterator_tag> {};
587
588template <class _Tp>
589struct __is_cpp17_bidirectional_iterator : public __has_iterator_category_convertible_to<_Tp, bidirectional_iterator_tag> {};
590
591template <class _Tp>
592struct __is_cpp17_random_access_iterator : public __has_iterator_category_convertible_to<_Tp, random_access_iterator_tag> {};
593
594#if _LIBCPP_STD_VER > 17
595template <class _Tp>
596struct __is_cpp17_contiguous_iterator : public __has_iterator_category_convertible_to<_Tp, contiguous_iterator_tag> {};
597#else
598template <class _Tp>
599struct __is_cpp17_contiguous_iterator : public false_type {};
600#endif
601
602
603template <class _Tp>
604struct __is_exactly_cpp17_input_iterator
605 : public integral_constant<bool,
606 __has_iterator_category_convertible_to<_Tp, input_iterator_tag>::value &&
607 !__has_iterator_category_convertible_to<_Tp, forward_iterator_tag>::value> {};
608
609#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
610template<class _InputIterator>
611using __iter_value_type = typename iterator_traits<_InputIterator>::value_type;
612
613template<class _InputIterator>
614using __iter_key_type = remove_const_t<typename iterator_traits<_InputIterator>::value_type::first_type>;
615
616template<class _InputIterator>
617using __iter_mapped_type = typename iterator_traits<_InputIterator>::value_type::second_type;
618
619template<class _InputIterator>
620using __iter_to_alloc_type = pair<
621 add_const_t<typename iterator_traits<_InputIterator>::value_type::first_type>,
622 typename iterator_traits<_InputIterator>::value_type::second_type>;
623#endif
624
625template<class _Category, class _Tp, class _Distance = ptrdiff_t,
626 class _Pointer = _Tp*, class _Reference = _Tp&>
627struct _LIBCPP_TEMPLATE_VIS iterator
628{
629 typedef _Tp value_type;
630 typedef _Distance difference_type;
631 typedef _Pointer pointer;
632 typedef _Reference reference;
633 typedef _Category iterator_category;
634};
635
636template <class _InputIter>
637inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
638void __advance(_InputIter& __i,
639 typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag)
640{
641 for (; __n > 0; --__n)
642 ++__i;
643}
644
645template <class _BiDirIter>
646inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
647void __advance(_BiDirIter& __i,
648 typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag)
649{
650 if (__n >= 0)
651 for (; __n > 0; --__n)
652 ++__i;
653 else
654 for (; __n < 0; ++__n)
655 --__i;
656}
657
658template <class _RandIter>
659inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
660void __advance(_RandIter& __i,
661 typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag)
662{
663 __i += __n;
664}
665
666template <class _InputIter>
667inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
668void advance(_InputIter& __i,
669 typename iterator_traits<_InputIter>::difference_type __n)
670{
671 _LIBCPP_ASSERT(__n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value,
672 "Attempt to advance(it, -n) on a non-bidi iterator");
673 __advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category());
674}
675
676template <class _InputIter>
677inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
678typename iterator_traits<_InputIter>::difference_type
679__distance(_InputIter __first, _InputIter __last, input_iterator_tag)
680{
681 typename iterator_traits<_InputIter>::difference_type __r(0);
682 for (; __first != __last; ++__first)
683 ++__r;
684 return __r;
685}
686
687template <class _RandIter>
688inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
689typename iterator_traits<_RandIter>::difference_type
690__distance(_RandIter __first, _RandIter __last, random_access_iterator_tag)
691{
692 return __last - __first;
693}
694
695template <class _InputIter>
696inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
697typename iterator_traits<_InputIter>::difference_type
698distance(_InputIter __first, _InputIter __last)
699{
700 return __distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category());
701}
702
703template <class _InputIter>
704inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
705typename enable_if
706<
707 __is_cpp17_input_iterator<_InputIter>::value,
708 _InputIter
709>::type
710next(_InputIter __x,
711 typename iterator_traits<_InputIter>::difference_type __n = 1)
712{
713 _LIBCPP_ASSERT(__n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value,
714 "Attempt to next(it, -n) on a non-bidi iterator");
715
716 _VSTD::advance(__x, __n);
717 return __x;
718}
719
720template <class _InputIter>
721inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
722typename enable_if
723<
724 __is_cpp17_input_iterator<_InputIter>::value,
725 _InputIter
726>::type
727prev(_InputIter __x,
728 typename iterator_traits<_InputIter>::difference_type __n = 1)
729{
730 _LIBCPP_ASSERT(__n <= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value,
731 "Attempt to prev(it, +n) on a non-bidi iterator");
732 _VSTD::advance(__x, -__n);
733 return __x;
734}
735
736
737template <class _Tp, class = void>
738struct __is_stashing_iterator : false_type {};
739
740template <class _Tp>
741struct __is_stashing_iterator<_Tp, typename __void_t<typename _Tp::__stashing_iterator_tag>::type>
742 : true_type {};
743
744template <class _Iter>
745class _LIBCPP_TEMPLATE_VIS reverse_iterator
746 : public iterator<typename iterator_traits<_Iter>::iterator_category,
747 typename iterator_traits<_Iter>::value_type,
748 typename iterator_traits<_Iter>::difference_type,
749 typename iterator_traits<_Iter>::pointer,
750 typename iterator_traits<_Iter>::reference>
751{
752private:
753 /*mutable*/ _Iter __t; // no longer used as of LWG #2360, not removed due to ABI break
754
755 static_assert(!__is_stashing_iterator<_Iter>::value,
756 "The specified iterator type cannot be used with reverse_iterator; "
757 "Using stashing iterators with reverse_iterator causes undefined behavior");
758
759protected:
760 _Iter current;
761public:
762 typedef _Iter iterator_type;
763 typedef typename iterator_traits<_Iter>::difference_type difference_type;
764 typedef typename iterator_traits<_Iter>::reference reference;
765 typedef typename iterator_traits<_Iter>::pointer pointer;
766
767 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
768 reverse_iterator() : __t(), current() {}
769 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
770 explicit reverse_iterator(_Iter __x) : __t(__x), current(__x) {}
771 template <class _Up>
772 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
773 reverse_iterator(const reverse_iterator<_Up>& __u) : __t(__u.base()), current(__u.base()) {}
774 template <class _Up>
775 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
776 reverse_iterator& operator=(const reverse_iterator<_Up>& __u)
777 { __t = current = __u.base(); return *this; }
778 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
779 _Iter base() const {return current;}
780 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
781 reference operator*() const {_Iter __tmp = current; return *--__tmp;}
782 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
783 pointer operator->() const {return _VSTD::addressof(operator*());}
784 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
785 reverse_iterator& operator++() {--current; return *this;}
786 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
787 reverse_iterator operator++(int) {reverse_iterator __tmp(*this); --current; return __tmp;}
788 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
789 reverse_iterator& operator--() {++current; return *this;}
790 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
791 reverse_iterator operator--(int) {reverse_iterator __tmp(*this); ++current; return __tmp;}
792 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
793 reverse_iterator operator+ (difference_type __n) const {return reverse_iterator(current - __n);}
794 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
795 reverse_iterator& operator+=(difference_type __n) {current -= __n; return *this;}
796 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
797 reverse_iterator operator- (difference_type __n) const {return reverse_iterator(current + __n);}
798 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
799 reverse_iterator& operator-=(difference_type __n) {current += __n; return *this;}
800 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
801 reference operator[](difference_type __n) const {return *(*this + __n);}
802};
803
804template <class _Iter1, class _Iter2>
805inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
806bool
807operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
808{
809 return __x.base() == __y.base();
810}
811
812template <class _Iter1, class _Iter2>
813inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
814bool
815operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
816{
817 return __x.base() > __y.base();
818}
819
820template <class _Iter1, class _Iter2>
821inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
822bool
823operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
824{
825 return __x.base() != __y.base();
826}
827
828template <class _Iter1, class _Iter2>
829inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
830bool
831operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
832{
833 return __x.base() < __y.base();
834}
835
836template <class _Iter1, class _Iter2>
837inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
838bool
839operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
840{
841 return __x.base() <= __y.base();
842}
843
844template <class _Iter1, class _Iter2>
845inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
846bool
847operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
848{
849 return __x.base() >= __y.base();
850}
851
852#ifndef _LIBCPP_CXX03_LANG
853template <class _Iter1, class _Iter2>
854inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
855auto
856operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
857-> decltype(__y.base() - __x.base())
858{
859 return __y.base() - __x.base();
860}
861#else
862template <class _Iter1, class _Iter2>
863inline _LIBCPP_INLINE_VISIBILITY
864typename reverse_iterator<_Iter1>::difference_type
865operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y)
866{
867 return __y.base() - __x.base();
868}
869#endif
870
871template <class _Iter>
872inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
873reverse_iterator<_Iter>
874operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_iterator<_Iter>& __x)
875{
876 return reverse_iterator<_Iter>(__x.base() - __n);
877}
878
879#if _LIBCPP_STD_VER > 11
880template <class _Iter>
881inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
882reverse_iterator<_Iter> make_reverse_iterator(_Iter __i)
883{
884 return reverse_iterator<_Iter>(__i);
885}
886#endif
887
888template <class _Container>
889class _LIBCPP_TEMPLATE_VIS back_insert_iterator
890 : public iterator<output_iterator_tag,
891 void,
892 void,
893 void,
894 void>
895{
896protected:
897 _Container* container;
898public:
899 typedef _Container container_type;
900
901 _LIBCPP_INLINE_VISIBILITY explicit back_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {}
902 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(const typename _Container::value_type& __value_)
903 {container->push_back(__value_); return *this;}
904#ifndef _LIBCPP_CXX03_LANG
905 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(typename _Container::value_type&& __value_)
906 {container->push_back(_VSTD::move(__value_)); return *this;}
907#endif // _LIBCPP_CXX03_LANG
908 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator*() {return *this;}
909 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator++() {return *this;}
910 _LIBCPP_INLINE_VISIBILITY back_insert_iterator operator++(int) {return *this;}
911};
912
913template <class _Container>
914inline _LIBCPP_INLINE_VISIBILITY
915back_insert_iterator<_Container>
916back_inserter(_Container& __x)
917{
918 return back_insert_iterator<_Container>(__x);
919}
920
921template <class _Container>
922class _LIBCPP_TEMPLATE_VIS front_insert_iterator
923 : public iterator<output_iterator_tag,
924 void,
925 void,
926 void,
927 void>
928{
929protected:
930 _Container* container;
931public:
932 typedef _Container container_type;
933
934 _LIBCPP_INLINE_VISIBILITY explicit front_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {}
935 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(const typename _Container::value_type& __value_)
936 {container->push_front(__value_); return *this;}
937#ifndef _LIBCPP_CXX03_LANG
938 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(typename _Container::value_type&& __value_)
939 {container->push_front(_VSTD::move(__value_)); return *this;}
940#endif // _LIBCPP_CXX03_LANG
941 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator*() {return *this;}
942 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator++() {return *this;}
943 _LIBCPP_INLINE_VISIBILITY front_insert_iterator operator++(int) {return *this;}
944};
945
946template <class _Container>
947inline _LIBCPP_INLINE_VISIBILITY
948front_insert_iterator<_Container>
949front_inserter(_Container& __x)
950{
951 return front_insert_iterator<_Container>(__x);
952}
953
954template <class _Container>
955class _LIBCPP_TEMPLATE_VIS insert_iterator
956 : public iterator<output_iterator_tag,
957 void,
958 void,
959 void,
960 void>
961{
962protected:
963 _Container* container;
964 typename _Container::iterator iter;
965public:
966 typedef _Container container_type;
967
968 _LIBCPP_INLINE_VISIBILITY insert_iterator(_Container& __x, typename _Container::iterator __i)
969 : container(_VSTD::addressof(__x)), iter(__i) {}
970 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(const typename _Container::value_type& __value_)
971 {iter = container->insert(iter, __value_); ++iter; return *this;}
972#ifndef _LIBCPP_CXX03_LANG
973 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(typename _Container::value_type&& __value_)
974 {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;}
975#endif // _LIBCPP_CXX03_LANG
976 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator*() {return *this;}
977 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++() {return *this;}
978 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++(int) {return *this;}
979};
980
981template <class _Container>
982inline _LIBCPP_INLINE_VISIBILITY
983insert_iterator<_Container>
984inserter(_Container& __x, typename _Container::iterator __i)
985{
986 return insert_iterator<_Container>(__x, __i);
987}
988
989template <class _Tp, class _CharT = char,
990 class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t>
991class _LIBCPP_TEMPLATE_VIS istream_iterator
992 : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&>
993{
994public:
995 typedef _CharT char_type;
996 typedef _Traits traits_type;
997 typedef basic_istream<_CharT,_Traits> istream_type;
998private:
999 istream_type* __in_stream_;
1000 _Tp __value_;
1001public:
1002 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(0), __value_() {}
1003 _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s))
1004 {
1005 if (!(*__in_stream_ >> __value_))
1006 __in_stream_ = 0;
1007 }
1008
1009 _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;}
1010 _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));}
1011 _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++()
1012 {
1013 if (!(*__in_stream_ >> __value_))
1014 __in_stream_ = 0;
1015 return *this;
1016 }
1017 _LIBCPP_INLINE_VISIBILITY istream_iterator operator++(int)
1018 {istream_iterator __t(*this); ++(*this); return __t;}
1019
1020 template <class _Up, class _CharU, class _TraitsU, class _DistanceU>
1021 friend _LIBCPP_INLINE_VISIBILITY
1022 bool
1023 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x,
1024 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y);
1025
1026 template <class _Up, class _CharU, class _TraitsU, class _DistanceU>
1027 friend _LIBCPP_INLINE_VISIBILITY
1028 bool
1029 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x,
1030 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y);
1031};
1032
1033template <class _Tp, class _CharT, class _Traits, class _Distance>
1034inline _LIBCPP_INLINE_VISIBILITY
1035bool
1036operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
1037 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y)
1038{
1039 return __x.__in_stream_ == __y.__in_stream_;
1040}
1041
1042template <class _Tp, class _CharT, class _Traits, class _Distance>
1043inline _LIBCPP_INLINE_VISIBILITY
1044bool
1045operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
1046 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y)
1047{
1048 return !(__x == __y);
1049}
1050
1051template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT> >
1052class _LIBCPP_TEMPLATE_VIS ostream_iterator
1053 : public iterator<output_iterator_tag, void, void, void, void>
1054{
1055public:
1056 typedef _CharT char_type;
1057 typedef _Traits traits_type;
1058 typedef basic_ostream<_CharT,_Traits> ostream_type;
1059private:
1060 ostream_type* __out_stream_;
1061 const char_type* __delim_;
1062public:
1063 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s) _NOEXCEPT
1064 : __out_stream_(_VSTD::addressof(__s)), __delim_(0) {}
1065 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter) _NOEXCEPT
1066 : __out_stream_(_VSTD::addressof(__s)), __delim_(__delimiter) {}
1067 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator=(const _Tp& __value_)
1068 {
1069 *__out_stream_ << __value_;
1070 if (__delim_)
1071 *__out_stream_ << __delim_;
1072 return *this;
1073 }
1074
1075 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator*() {return *this;}
1076 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++() {return *this;}
1077 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++(int) {return *this;}
1078};
1079
1080template<class _CharT, class _Traits>
1081class _LIBCPP_TEMPLATE_VIS istreambuf_iterator
1082 : public iterator<input_iterator_tag, _CharT,
1083 typename _Traits::off_type, _CharT*,
1084 _CharT>
1085{
1086public:
1087 typedef _CharT char_type;
1088 typedef _Traits traits_type;
1089 typedef typename _Traits::int_type int_type;
1090 typedef basic_streambuf<_CharT,_Traits> streambuf_type;
1091 typedef basic_istream<_CharT,_Traits> istream_type;
1092private:
1093 mutable streambuf_type* __sbuf_;
1094
1095 class __proxy
1096 {
1097 char_type __keep_;
1098 streambuf_type* __sbuf_;
1099 _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s)
1100 : __keep_(__c), __sbuf_(__s) {}
1101 friend class istreambuf_iterator;
1102 public:
1103 _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;}
1104 };
1105
1106 _LIBCPP_INLINE_VISIBILITY
1107 bool __test_for_eof() const
1108 {
1109 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof()))
1110 __sbuf_ = 0;
1111 return __sbuf_ == 0;
1112 }
1113public:
1114 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(0) {}
1115 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT
1116 : __sbuf_(__s.rdbuf()) {}
1117 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT
1118 : __sbuf_(__s) {}
1119 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT
1120 : __sbuf_(__p.__sbuf_) {}
1121
1122 _LIBCPP_INLINE_VISIBILITY char_type operator*() const
1123 {return static_cast<char_type>(__sbuf_->sgetc());}
1124 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++()
1125 {
1126 __sbuf_->sbumpc();
1127 return *this;
1128 }
1129 _LIBCPP_INLINE_VISIBILITY __proxy operator++(int)
1130 {
1131 return __proxy(__sbuf_->sbumpc(), __sbuf_);
1132 }
1133
1134 _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const
1135 {return __test_for_eof() == __b.__test_for_eof();}
1136};
1137
1138template <class _CharT, class _Traits>
1139inline _LIBCPP_INLINE_VISIBILITY
1140bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a,
1141 const istreambuf_iterator<_CharT,_Traits>& __b)
1142 {return __a.equal(__b);}
1143
1144template <class _CharT, class _Traits>
1145inline _LIBCPP_INLINE_VISIBILITY
1146bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a,
1147 const istreambuf_iterator<_CharT,_Traits>& __b)
1148 {return !__a.equal(__b);}
1149
1150template <class _CharT, class _Traits>
1151class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator
1152 : public iterator<output_iterator_tag, void, void, void, void>
1153{
1154public:
1155 typedef _CharT char_type;
1156 typedef _Traits traits_type;
1157 typedef basic_streambuf<_CharT,_Traits> streambuf_type;
1158 typedef basic_ostream<_CharT,_Traits> ostream_type;
1159private:
1160 streambuf_type* __sbuf_;
1161public:
1162 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) _NOEXCEPT
1163 : __sbuf_(__s.rdbuf()) {}
1164 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT
1165 : __sbuf_(__s) {}
1166 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c)
1167 {
1168 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof()))
1169 __sbuf_ = 0;
1170 return *this;
1171 }
1172 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*() {return *this;}
1173 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++() {return *this;}
1174 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;}
1175 _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == 0;}
1176
1177 template <class _Ch, class _Tr>
1178 friend
1179 _LIBCPP_HIDDEN
1180 ostreambuf_iterator<_Ch, _Tr>
1181 __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s,
1182 const _Ch* __ob, const _Ch* __op, const _Ch* __oe,
1183 ios_base& __iob, _Ch __fl);
1184};
1185
1186template <class _Iter>
1187class _LIBCPP_TEMPLATE_VIS move_iterator
1188{
1189private:
1190 _Iter __i;
1191public:
1192 typedef _Iter iterator_type;
1193 typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
1194 typedef typename iterator_traits<iterator_type>::value_type value_type;
1195 typedef typename iterator_traits<iterator_type>::difference_type difference_type;
1196 typedef iterator_type pointer;
1197#ifndef _LIBCPP_CXX03_LANG
1198 typedef typename iterator_traits<iterator_type>::reference __reference;
1199 typedef typename conditional<
1200 is_reference<__reference>::value,
1201 typename remove_reference<__reference>::type&&,
1202 __reference
1203 >::type reference;
1204#else
1205 typedef typename iterator_traits<iterator_type>::reference reference;
1206#endif
1207
1208 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1209 move_iterator() : __i() {}
1210 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1211 explicit move_iterator(_Iter __x) : __i(__x) {}
1212 template <class _Up>
1213 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1214 move_iterator(const move_iterator<_Up>& __u) : __i(__u.base()) {}
1215 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 _Iter base() const {return __i;}
1216 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1217 reference operator*() const { return static_cast<reference>(*__i); }
1218 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1219 pointer operator->() const { return __i;}
1220 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1221 move_iterator& operator++() {++__i; return *this;}
1222 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1223 move_iterator operator++(int) {move_iterator __tmp(*this); ++__i; return __tmp;}
1224 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1225 move_iterator& operator--() {--__i; return *this;}
1226 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1227 move_iterator operator--(int) {move_iterator __tmp(*this); --__i; return __tmp;}
1228 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1229 move_iterator operator+ (difference_type __n) const {return move_iterator(__i + __n);}
1230 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1231 move_iterator& operator+=(difference_type __n) {__i += __n; return *this;}
1232 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1233 move_iterator operator- (difference_type __n) const {return move_iterator(__i - __n);}
1234 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1235 move_iterator& operator-=(difference_type __n) {__i -= __n; return *this;}
1236 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1237 reference operator[](difference_type __n) const { return static_cast<reference>(__i[__n]); }
1238};
1239
1240template <class _Iter1, class _Iter2>
1241inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1242bool
1243operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1244{
1245 return __x.base() == __y.base();
1246}
1247
1248template <class _Iter1, class _Iter2>
1249inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1250bool
1251operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1252{
1253 return __x.base() < __y.base();
1254}
1255
1256template <class _Iter1, class _Iter2>
1257inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1258bool
1259operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1260{
1261 return __x.base() != __y.base();
1262}
1263
1264template <class _Iter1, class _Iter2>
1265inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1266bool
1267operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1268{
1269 return __x.base() > __y.base();
1270}
1271
1272template <class _Iter1, class _Iter2>
1273inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1274bool
1275operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1276{
1277 return __x.base() >= __y.base();
1278}
1279
1280template <class _Iter1, class _Iter2>
1281inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1282bool
1283operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1284{
1285 return __x.base() <= __y.base();
1286}
1287
1288#ifndef _LIBCPP_CXX03_LANG
1289template <class _Iter1, class _Iter2>
1290inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1291auto
1292operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1293-> decltype(__x.base() - __y.base())
1294{
1295 return __x.base() - __y.base();
1296}
1297#else
1298template <class _Iter1, class _Iter2>
1299inline _LIBCPP_INLINE_VISIBILITY
1300typename move_iterator<_Iter1>::difference_type
1301operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
1302{
1303 return __x.base() - __y.base();
1304}
1305#endif
1306
1307template <class _Iter>
1308inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1309move_iterator<_Iter>
1310operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x)
1311{
1312 return move_iterator<_Iter>(__x.base() + __n);
1313}
1314
1315template <class _Iter>
1316inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1317move_iterator<_Iter>
1318make_move_iterator(_Iter __i)
1319{
1320 return move_iterator<_Iter>(__i);
1321}
1322
1323// __wrap_iter
1324
1325template <class _Iter> class __wrap_iter;
1326
1327template <class _Iter1, class _Iter2>
1328_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1329bool
1330operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1331
1332template <class _Iter1, class _Iter2>
1333_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1334bool
1335operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1336
1337template <class _Iter1, class _Iter2>
1338_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1339bool
1340operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1341
1342template <class _Iter1, class _Iter2>
1343_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1344bool
1345operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1346
1347template <class _Iter1, class _Iter2>
1348_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1349bool
1350operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1351
1352template <class _Iter1, class _Iter2>
1353_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1354bool
1355operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1356
1357#ifndef _LIBCPP_CXX03_LANG
1358template <class _Iter1, class _Iter2>
1359_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1360auto
1361operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1362-> decltype(__x.base() - __y.base());
1363#else
1364template <class _Iter1, class _Iter2>
1365_LIBCPP_INLINE_VISIBILITY
1366typename __wrap_iter<_Iter1>::difference_type
1367operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1368#endif
1369
1370template <class _Iter>
1371_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1372__wrap_iter<_Iter>
1373operator+(typename __wrap_iter<_Iter>::difference_type, __wrap_iter<_Iter>) _NOEXCEPT;
1374
1375template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 copy(_Ip, _Ip, _Op);
1376template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 copy_backward(_B1, _B1, _B2);
1377template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY move(_Ip, _Ip, _Op);
1378template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY move_backward(_B1, _B1, _B2);
1379
1380#if _LIBCPP_DEBUG_LEVEL < 2
1381
1382template <class _Tp>
1383_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1384typename enable_if
1385<
1386 is_trivially_copy_assignable<_Tp>::value,
1387 _Tp*
1388>::type
1389__unwrap_iter(__wrap_iter<_Tp*>);
1390
1391#else
1392
1393template <class _Tp>
1394inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1395typename enable_if
1396<
1397 is_trivially_copy_assignable<_Tp>::value,
1398 __wrap_iter<_Tp*>
1399>::type
1400__unwrap_iter(__wrap_iter<_Tp*> __i);
1401
1402#endif
1403
1404template <class _Iter>
1405class __wrap_iter
1406{
1407public:
1408 typedef _Iter iterator_type;
1409 typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
1410 typedef typename iterator_traits<iterator_type>::value_type value_type;
1411 typedef typename iterator_traits<iterator_type>::difference_type difference_type;
1412 typedef typename iterator_traits<iterator_type>::pointer pointer;
1413 typedef typename iterator_traits<iterator_type>::reference reference;
1414private:
1415 iterator_type __i;
1416public:
1417 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter() _NOEXCEPT
1418#if _LIBCPP_STD_VER > 11
1419 : __i{}
1420#endif
1421 {
1422#if _LIBCPP_DEBUG_LEVEL >= 2
1423 __get_db()->__insert_i(this);
1424#endif
1425 }
1426 template <class _Up> _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1427 __wrap_iter(const __wrap_iter<_Up>& __u,
1428 typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = 0) _NOEXCEPT
1429 : __i(__u.base())
1430 {
1431#if _LIBCPP_DEBUG_LEVEL >= 2
1432 __get_db()->__iterator_copy(this, &__u);
1433#endif
1434 }
1435#if _LIBCPP_DEBUG_LEVEL >= 2
1436 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1437 __wrap_iter(const __wrap_iter& __x)
1438 : __i(__x.base())
1439 {
1440 __get_db()->__iterator_copy(this, &__x);
1441 }
1442 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1443 __wrap_iter& operator=(const __wrap_iter& __x)
1444 {
1445 if (this != &__x)
1446 {
1447 __get_db()->__iterator_copy(this, &__x);
1448 __i = __x.__i;
1449 }
1450 return *this;
1451 }
1452 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1453 ~__wrap_iter()
1454 {
1455 __get_db()->__erase_i(this);
1456 }
1457#endif
1458 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator*() const _NOEXCEPT
1459 {
1460#if _LIBCPP_DEBUG_LEVEL >= 2
1461 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1462 "Attempted to dereference a non-dereferenceable iterator");
1463#endif
1464 return *__i;
1465 }
1466 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG pointer operator->() const _NOEXCEPT
1467 {
1468#if _LIBCPP_DEBUG_LEVEL >= 2
1469 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1470 "Attempted to dereference a non-dereferenceable iterator");
1471#endif
1472 return (pointer)_VSTD::addressof(*__i);
1473 }
1474 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator++() _NOEXCEPT
1475 {
1476#if _LIBCPP_DEBUG_LEVEL >= 2
1477 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
1478 "Attempted to increment non-incrementable iterator");
1479#endif
1480 ++__i;
1481 return *this;
1482 }
1483 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator++(int) _NOEXCEPT
1484 {__wrap_iter __tmp(*this); ++(*this); return __tmp;}
1485
1486 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator--() _NOEXCEPT
1487 {
1488#if _LIBCPP_DEBUG_LEVEL >= 2
1489 _LIBCPP_ASSERT(__get_const_db()->__decrementable(this),
1490 "Attempted to decrement non-decrementable iterator");
1491#endif
1492 --__i;
1493 return *this;
1494 }
1495 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator--(int) _NOEXCEPT
1496 {__wrap_iter __tmp(*this); --(*this); return __tmp;}
1497 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator+ (difference_type __n) const _NOEXCEPT
1498 {__wrap_iter __w(*this); __w += __n; return __w;}
1499 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator+=(difference_type __n) _NOEXCEPT
1500 {
1501#if _LIBCPP_DEBUG_LEVEL >= 2
1502 _LIBCPP_ASSERT(__get_const_db()->__addable(this, __n),
1503 "Attempted to add/subtract iterator outside of valid range");
1504#endif
1505 __i += __n;
1506 return *this;
1507 }
1508 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator- (difference_type __n) const _NOEXCEPT
1509 {return *this + (-__n);}
1510 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator-=(difference_type __n) _NOEXCEPT
1511 {*this += -__n; return *this;}
1512 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator[](difference_type __n) const _NOEXCEPT
1513 {
1514#if _LIBCPP_DEBUG_LEVEL >= 2
1515 _LIBCPP_ASSERT(__get_const_db()->__subscriptable(this, __n),
1516 "Attempted to subscript iterator outside of valid range");
1517#endif
1518 return __i[__n];
1519 }
1520
1521 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG iterator_type base() const _NOEXCEPT {return __i;}
1522
1523private:
1524#if _LIBCPP_DEBUG_LEVEL >= 2
1525 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(const void* __p, iterator_type __x) : __i(__x)
1526 {
1527 __get_db()->__insert_ic(this, __p);
1528 }
1529#else
1530 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {}
1531#endif
1532
1533 template <class _Up> friend class __wrap_iter;
1534 template <class _CharT, class _Traits, class _Alloc> friend class basic_string;
1535 template <class _Tp, class _Alloc> friend class _LIBCPP_TEMPLATE_VIS vector;
1536 template <class _Tp, size_t> friend class _LIBCPP_TEMPLATE_VIS span;
1537
1538 template <class _Iter1, class _Iter2>
1539 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1540 bool
1541 operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1542
1543 template <class _Iter1, class _Iter2>
1544 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1545 bool
1546 operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1547
1548 template <class _Iter1, class _Iter2>
1549 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1550 bool
1551 operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1552
1553 template <class _Iter1, class _Iter2>
1554 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1555 bool
1556 operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1557
1558 template <class _Iter1, class _Iter2>
1559 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1560 bool
1561 operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1562
1563 template <class _Iter1, class _Iter2>
1564 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1565 bool
1566 operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1567
1568#ifndef _LIBCPP_CXX03_LANG
1569 template <class _Iter1, class _Iter2>
1570 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1571 auto
1572 operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1573 -> decltype(__x.base() - __y.base());
1574#else
1575 template <class _Iter1, class _Iter2>
1576 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1577 typename __wrap_iter<_Iter1>::difference_type
1578 operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
1579#endif
1580
1581 template <class _Iter1>
1582 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1583 __wrap_iter<_Iter1>
1584 operator+(typename __wrap_iter<_Iter1>::difference_type, __wrap_iter<_Iter1>) _NOEXCEPT;
1585
1586 template <class _Ip, class _Op> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _Op copy(_Ip, _Ip, _Op);
1587 template <class _B1, class _B2> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _B2 copy_backward(_B1, _B1, _B2);
1588 template <class _Ip, class _Op> friend _Op move(_Ip, _Ip, _Op);
1589 template <class _B1, class _B2> friend _B2 move_backward(_B1, _B1, _B2);
1590
1591#if _LIBCPP_DEBUG_LEVEL < 2
1592 template <class _Tp>
1593 _LIBCPP_CONSTEXPR_IF_NODEBUG friend
1594 typename enable_if
1595 <
1596 is_trivially_copy_assignable<_Tp>::value,
1597 _Tp*
1598 >::type
1599 __unwrap_iter(__wrap_iter<_Tp*>);
1600#else
1601 template <class _Tp>
1602 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1603 typename enable_if
1604 <
1605 is_trivially_copy_assignable<_Tp>::value,
1606 __wrap_iter<_Tp*>
1607 >::type
1608 __unwrap_iter(__wrap_iter<_Tp*> __i);
1609#endif
1610};
1611
1612template <class _Iter1, class _Iter2>
1613inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1614bool
1615operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1616{
1617 return __x.base() == __y.base();
1618}
1619
1620template <class _Iter1, class _Iter2>
1621inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1622bool
1623operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1624{
1625#if _LIBCPP_DEBUG_LEVEL >= 2
1626 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1627 "Attempted to compare incomparable iterators");
1628#endif
1629 return __x.base() < __y.base();
1630}
1631
1632template <class _Iter1, class _Iter2>
1633inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1634bool
1635operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1636{
1637 return !(__x == __y);
1638}
1639
1640template <class _Iter1, class _Iter2>
1641inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1642bool
1643operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1644{
1645 return __y < __x;
1646}
1647
1648template <class _Iter1, class _Iter2>
1649inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1650bool
1651operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1652{
1653 return !(__x < __y);
1654}
1655
1656template <class _Iter1, class _Iter2>
1657inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1658bool
1659operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1660{
1661 return !(__y < __x);
1662}
1663
1664template <class _Iter1>
1665inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1666bool
1667operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1668{
1669 return !(__x == __y);
1670}
1671
1672template <class _Iter1>
1673inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1674bool
1675operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1676{
1677 return __y < __x;
1678}
1679
1680template <class _Iter1>
1681inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1682bool
1683operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1684{
1685 return !(__x < __y);
1686}
1687
1688template <class _Iter1>
1689inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1690bool
1691operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
1692{
1693 return !(__y < __x);
1694}
1695
1696#ifndef _LIBCPP_CXX03_LANG
1697template <class _Iter1, class _Iter2>
1698inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1699auto
1700operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1701-> decltype(__x.base() - __y.base())
1702{
1703#if _LIBCPP_DEBUG_LEVEL >= 2
1704 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1705 "Attempted to subtract incompatible iterators");
1706#endif
1707 return __x.base() - __y.base();
1708}
1709#else
1710template <class _Iter1, class _Iter2>
1711inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1712typename __wrap_iter<_Iter1>::difference_type
1713operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
1714{
1715#if _LIBCPP_DEBUG_LEVEL >= 2
1716 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
1717 "Attempted to subtract incompatible iterators");
1718#endif
1719 return __x.base() - __y.base();
1720}
1721#endif
1722
1723template <class _Iter>
1724inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
1725__wrap_iter<_Iter>
1726operator+(typename __wrap_iter<_Iter>::difference_type __n,
1727 __wrap_iter<_Iter> __x) _NOEXCEPT
1728{
1729 __x += __n;
1730 return __x;
1731}
1732
1733template <class _Iter>
1734struct __libcpp_is_trivial_iterator
1735 : public _LIBCPP_BOOL_CONSTANT(is_pointer<_Iter>::value) {};
1736
1737template <class _Iter>
1738struct __libcpp_is_trivial_iterator<move_iterator<_Iter> >
1739 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
1740
1741template <class _Iter>
1742struct __libcpp_is_trivial_iterator<reverse_iterator<_Iter> >
1743 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
1744
1745template <class _Iter>
1746struct __libcpp_is_trivial_iterator<__wrap_iter<_Iter> >
1747 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
1748
1749
1750template <class _Tp, size_t _Np>
1751_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1752_Tp*
1753begin(_Tp (&__array)[_Np])
1754{
1755 return __array;
1756}
1757
1758template <class _Tp, size_t _Np>
1759_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1760_Tp*
1761end(_Tp (&__array)[_Np])
1762{
1763 return __array + _Np;
1764}
1765
1766#if !defined(_LIBCPP_CXX03_LANG)
1767
1768template <class _Cp>
1769_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1770auto
1771begin(_Cp& __c) -> decltype(__c.begin())
1772{
1773 return __c.begin();
1774}
1775
1776template <class _Cp>
1777_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1778auto
1779begin(const _Cp& __c) -> decltype(__c.begin())
1780{
1781 return __c.begin();
1782}
1783
1784template <class _Cp>
1785_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1786auto
1787end(_Cp& __c) -> decltype(__c.end())
1788{
1789 return __c.end();
1790}
1791
1792template <class _Cp>
1793_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1794auto
1795end(const _Cp& __c) -> decltype(__c.end())
1796{
1797 return __c.end();
1798}
1799
1800#if _LIBCPP_STD_VER > 11
1801
1802template <class _Tp, size_t _Np>
1803_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1804reverse_iterator<_Tp*> rbegin(_Tp (&__array)[_Np])
1805{
1806 return reverse_iterator<_Tp*>(__array + _Np);
1807}
1808
1809template <class _Tp, size_t _Np>
1810_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1811reverse_iterator<_Tp*> rend(_Tp (&__array)[_Np])
1812{
1813 return reverse_iterator<_Tp*>(__array);
1814}
1815
1816template <class _Ep>
1817_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1818reverse_iterator<const _Ep*> rbegin(initializer_list<_Ep> __il)
1819{
1820 return reverse_iterator<const _Ep*>(__il.end());
1821}
1822
1823template <class _Ep>
1824_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1825reverse_iterator<const _Ep*> rend(initializer_list<_Ep> __il)
1826{
1827 return reverse_iterator<const _Ep*>(__il.begin());
1828}
1829
1830template <class _Cp>
1831_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1832auto cbegin(const _Cp& __c) -> decltype(_VSTD::begin(__c))
1833{
1834 return _VSTD::begin(__c);
1835}
1836
1837template <class _Cp>
1838_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1839auto cend(const _Cp& __c) -> decltype(_VSTD::end(__c))
1840{
1841 return _VSTD::end(__c);
1842}
1843
1844template <class _Cp>
1845_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1846auto rbegin(_Cp& __c) -> decltype(__c.rbegin())
1847{
1848 return __c.rbegin();
1849}
1850
1851template <class _Cp>
1852_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1853auto rbegin(const _Cp& __c) -> decltype(__c.rbegin())
1854{
1855 return __c.rbegin();
1856}
1857
1858template <class _Cp>
1859_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1860auto rend(_Cp& __c) -> decltype(__c.rend())
1861{
1862 return __c.rend();
1863}
1864
1865template <class _Cp>
1866_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1867auto rend(const _Cp& __c) -> decltype(__c.rend())
1868{
1869 return __c.rend();
1870}
1871
1872template <class _Cp>
1873_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1874auto crbegin(const _Cp& __c) -> decltype(_VSTD::rbegin(__c))
1875{
1876 return _VSTD::rbegin(__c);
1877}
1878
1879template <class _Cp>
1880_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
1881auto crend(const _Cp& __c) -> decltype(_VSTD::rend(__c))
1882{
1883 return _VSTD::rend(__c);
1884}
1885
1886#endif
1887
1888
1889#else // defined(_LIBCPP_CXX03_LANG)
1890
1891template <class _Cp>
1892_LIBCPP_INLINE_VISIBILITY
1893typename _Cp::iterator
1894begin(_Cp& __c)
1895{
1896 return __c.begin();
1897}
1898
1899template <class _Cp>
1900_LIBCPP_INLINE_VISIBILITY
1901typename _Cp::const_iterator
1902begin(const _Cp& __c)
1903{
1904 return __c.begin();
1905}
1906
1907template <class _Cp>
1908_LIBCPP_INLINE_VISIBILITY
1909typename _Cp::iterator
1910end(_Cp& __c)
1911{
1912 return __c.end();
1913}
1914
1915template <class _Cp>
1916_LIBCPP_INLINE_VISIBILITY
1917typename _Cp::const_iterator
1918end(const _Cp& __c)
1919{
1920 return __c.end();
1921}
1922
1923#endif // !defined(_LIBCPP_CXX03_LANG)
1924
1925#if _LIBCPP_STD_VER > 14
1926
1927// #if _LIBCPP_STD_VER > 11
1928// template <>
1929// struct _LIBCPP_TEMPLATE_VIS plus<void>
1930// {
1931// template <class _T1, class _T2>
1932// _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
1933// auto operator()(_T1&& __t, _T2&& __u) const
1934// _NOEXCEPT_(noexcept(_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u)))
1935// -> decltype (_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u))
1936// { return _VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u); }
1937// typedef void is_transparent;
1938// };
1939// #endif
1940
1941template <class _Cont>
1942_LIBCPP_INLINE_VISIBILITY
1943constexpr auto size(const _Cont& __c)
1944_NOEXCEPT_(noexcept(__c.size()))
1945-> decltype (__c.size())
1946{ return __c.size(); }
1947
1948template <class _Tp, size_t _Sz>
1949_LIBCPP_INLINE_VISIBILITY
1950constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; }
1951
1952#if _LIBCPP_STD_VER > 17
1953template <class _Cont>
1954_LIBCPP_INLINE_VISIBILITY
1955constexpr auto ssize(const _Cont& __c)
1956_NOEXCEPT_(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size())))
1957-> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>
1958{ return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); }
1959
1960template <class _Tp, ptrdiff_t _Sz>
1961_LIBCPP_INLINE_VISIBILITY
1962constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { return _Sz; }
1963#endif
1964
1965template <class _Cont>
1966_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
1967constexpr auto empty(const _Cont& __c)
1968_NOEXCEPT_(noexcept(__c.empty()))
1969-> decltype (__c.empty())
1970{ return __c.empty(); }
1971
1972template <class _Tp, size_t _Sz>
1973_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
1974constexpr bool empty(const _Tp (&)[_Sz]) noexcept { return false; }
1975
1976template <class _Ep>
1977_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
1978constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; }
1979
1980template <class _Cont> constexpr
1981_LIBCPP_INLINE_VISIBILITY
1982auto data(_Cont& __c)
1983_NOEXCEPT_(noexcept(__c.data()))
1984-> decltype (__c.data())
1985{ return __c.data(); }
1986
1987template <class _Cont> constexpr
1988_LIBCPP_INLINE_VISIBILITY
1989auto data(const _Cont& __c)
1990_NOEXCEPT_(noexcept(__c.data()))
1991-> decltype (__c.data())
1992{ return __c.data(); }
1993
1994template <class _Tp, size_t _Sz>
1995_LIBCPP_INLINE_VISIBILITY
1996constexpr _Tp* data(_Tp (&__array)[_Sz]) noexcept { return __array; }
1997
1998template <class _Ep>
1999_LIBCPP_INLINE_VISIBILITY
2000constexpr const _Ep* data(initializer_list<_Ep> __il) noexcept { return __il.begin(); }
2001#endif
2002
2003
2004_LIBCPP_END_NAMESPACE_STD
2005
2006#endif // _LIBCPP_ITERATOR
2007