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 57template <class InputIterator, class Distance> // constexpr in C++17 58 constexpr void advance(InputIterator& i, Distance n); 59 60template <class InputIterator> // constexpr in C++17 61 constexpr typename iterator_traits<InputIterator>::difference_type 62 distance(InputIterator first, InputIterator last); 63 64template <class InputIterator> // constexpr in C++17 65 constexpr InputIterator next(InputIterator x, 66typename iterator_traits<InputIterator>::difference_type n = 1); 67 68template <class BidirectionalIterator> // constexpr in C++17 69 constexpr BidirectionalIterator prev(BidirectionalIterator x, 70 typename iterator_traits<BidirectionalIterator>::difference_type n = 1); 71 72template <class Iterator> 73class reverse_iterator 74 : public iterator<typename iterator_traits<Iterator>::iterator_category, 75 typename iterator_traits<Iterator>::value_type, 76 typename iterator_traits<Iterator>::difference_type, 77 typename iterator_traits<Iterator>::pointer, 78 typename iterator_traits<Iterator>::reference> 79{ 80protected: 81 Iterator current; 82public: 83 typedef Iterator iterator_type; 84 typedef typename iterator_traits<Iterator>::difference_type difference_type; 85 typedef typename iterator_traits<Iterator>::reference reference; 86 typedef typename iterator_traits<Iterator>::pointer pointer; 87 88 constexpr reverse_iterator(); 89 constexpr explicit reverse_iterator(Iterator x); 90 template <class U> constexpr reverse_iterator(const reverse_iterator<U>& u); 91 template <class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u); 92 constexpr Iterator base() const; 93 constexpr reference operator*() const; 94 constexpr pointer operator->() const; 95 constexpr reverse_iterator& operator++(); 96 constexpr reverse_iterator operator++(int); 97 constexpr reverse_iterator& operator--(); 98 constexpr reverse_iterator operator--(int); 99 constexpr reverse_iterator operator+ (difference_type n) const; 100 constexpr reverse_iterator& operator+=(difference_type n); 101 constexpr reverse_iterator operator- (difference_type n) const; 102 constexpr reverse_iterator& operator-=(difference_type n); 103 constexpr reference operator[](difference_type n) const; 104}; 105 106template <class Iterator1, class Iterator2> 107constexpr bool // constexpr in C++17 108operator==(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 109 110template <class Iterator1, class Iterator2> 111constexpr bool // constexpr in C++17 112operator<(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 113 114template <class Iterator1, class Iterator2> 115constexpr bool // constexpr in C++17 116operator!=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 117 118template <class Iterator1, class Iterator2> 119constexpr bool // constexpr in C++17 120operator>(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 121 122template <class Iterator1, class Iterator2> 123constexpr bool // constexpr in C++17 124operator>=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 125 126template <class Iterator1, class Iterator2> 127constexpr bool // constexpr in C++17 128operator<=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 129 130template <class Iterator1, class Iterator2> 131constexpr auto 132operator-(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y) 133-> decltype(__y.base() - __x.base()); // constexpr in C++17 134 135template <class Iterator> 136constexpr reverse_iterator<Iterator> 137operator+(typename reverse_iterator<Iterator>::difference_type n, 138 const reverse_iterator<Iterator>& x); // constexpr in C++17 139 140template <class Iterator> 141constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i); // C++14, constexpr in C++17 142 143template <class Container> 144class back_insert_iterator 145{ 146protected: 147 Container* container; 148public: 149 typedef Container container_type; 150 typedef void value_type; 151 typedef void difference_type; 152 typedef void reference; 153 typedef void pointer; 154 155 explicit back_insert_iterator(Container& x); 156 back_insert_iterator& operator=(const typename Container::value_type& value); 157 back_insert_iterator& operator*(); 158 back_insert_iterator& operator++(); 159 back_insert_iterator operator++(int); 160}; 161 162template <class Container> back_insert_iterator<Container> back_inserter(Container& x); 163 164template <class Container> 165class front_insert_iterator 166{ 167protected: 168 Container* container; 169public: 170 typedef Container container_type; 171 typedef void value_type; 172 typedef void difference_type; 173 typedef void reference; 174 typedef void pointer; 175 176 explicit front_insert_iterator(Container& x); 177 front_insert_iterator& operator=(const typename Container::value_type& value); 178 front_insert_iterator& operator*(); 179 front_insert_iterator& operator++(); 180 front_insert_iterator operator++(int); 181}; 182 183template <class Container> front_insert_iterator<Container> front_inserter(Container& x); 184 185template <class Container> 186class insert_iterator 187{ 188protected: 189 Container* container; 190 typename Container::iterator iter; 191public: 192 typedef Container container_type; 193 typedef void value_type; 194 typedef void difference_type; 195 typedef void reference; 196 typedef void pointer; 197 198 insert_iterator(Container& x, typename Container::iterator i); 199 insert_iterator& operator=(const typename Container::value_type& value); 200 insert_iterator& operator*(); 201 insert_iterator& operator++(); 202 insert_iterator& operator++(int); 203}; 204 205template <class Container, class Iterator> 206insert_iterator<Container> inserter(Container& x, Iterator i); 207 208template <class Iterator> 209class move_iterator { 210public: 211 typedef Iterator iterator_type; 212 typedef typename iterator_traits<Iterator>::difference_type difference_type; 213 typedef Iterator pointer; 214 typedef typename iterator_traits<Iterator>::value_type value_type; 215 typedef typename iterator_traits<Iterator>::iterator_category iterator_category; 216 typedef value_type&& reference; 217 218 constexpr move_iterator(); // all the constexprs are in C++17 219 constexpr explicit move_iterator(Iterator i); 220 template <class U> 221 constexpr move_iterator(const move_iterator<U>& u); 222 template <class U> 223 constexpr move_iterator& operator=(const move_iterator<U>& u); 224 constexpr iterator_type base() const; 225 constexpr reference operator*() const; 226 constexpr pointer operator->() const; 227 constexpr move_iterator& operator++(); 228 constexpr move_iterator operator++(int); 229 constexpr move_iterator& operator--(); 230 constexpr move_iterator operator--(int); 231 constexpr move_iterator operator+(difference_type n) const; 232 constexpr move_iterator& operator+=(difference_type n); 233 constexpr move_iterator operator-(difference_type n) const; 234 constexpr move_iterator& operator-=(difference_type n); 235 constexpr unspecified operator[](difference_type n) const; 236private: 237 Iterator current; // exposition only 238}; 239 240template <class Iterator1, class Iterator2> 241constexpr bool // constexpr in C++17 242operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 243 244template <class Iterator1, class Iterator2> 245constexpr bool // constexpr in C++17 246operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 247 248template <class Iterator1, class Iterator2> 249constexpr bool // constexpr in C++17 250operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 251 252template <class Iterator1, class Iterator2> 253constexpr bool // constexpr in C++17 254operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 255 256template <class Iterator1, class Iterator2> 257constexpr bool // constexpr in C++17 258operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 259 260template <class Iterator1, class Iterator2> 261constexpr bool // constexpr in C++17 262operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 263 264template <class Iterator1, class Iterator2> 265constexpr auto // constexpr in C++17 266operator-(const move_iterator<Iterator1>& x, 267 const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base()); 268 269template <class Iterator> 270constexpr move_iterator<Iterator> operator+( // constexpr in C++17 271 typename move_iterator<Iterator>::difference_type n, 272 const move_iterator<Iterator>& x); 273 274template <class Iterator> // constexpr in C++17 275constexpr move_iterator<Iterator> make_move_iterator(const Iterator& i); 276 277 278template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t> 279class istream_iterator 280 : public iterator<input_iterator_tag, T, Distance, const T*, const T&> 281{ 282public: 283 typedef charT char_type; 284 typedef traits traits_type; 285 typedef basic_istream<charT,traits> istream_type; 286 287 constexpr istream_iterator(); 288 istream_iterator(istream_type& s); 289 istream_iterator(const istream_iterator& x); 290 ~istream_iterator(); 291 292 const T& operator*() const; 293 const T* operator->() const; 294 istream_iterator& operator++(); 295 istream_iterator operator++(int); 296}; 297 298template <class T, class charT, class traits, class Distance> 299bool operator==(const istream_iterator<T,charT,traits,Distance>& x, 300 const istream_iterator<T,charT,traits,Distance>& y); 301template <class T, class charT, class traits, class Distance> 302bool operator!=(const istream_iterator<T,charT,traits,Distance>& x, 303 const istream_iterator<T,charT,traits,Distance>& y); 304 305template <class T, class charT = char, class traits = char_traits<charT> > 306class ostream_iterator 307 : public iterator<output_iterator_tag, void, void, void ,void> 308{ 309public: 310 typedef charT char_type; 311 typedef traits traits_type; 312 typedef basic_ostream<charT,traits> ostream_type; 313 314 ostream_iterator(ostream_type& s); 315 ostream_iterator(ostream_type& s, const charT* delimiter); 316 ostream_iterator(const ostream_iterator& x); 317 ~ostream_iterator(); 318 ostream_iterator& operator=(const T& value); 319 320 ostream_iterator& operator*(); 321 ostream_iterator& operator++(); 322 ostream_iterator& operator++(int); 323}; 324 325template<class charT, class traits = char_traits<charT> > 326class istreambuf_iterator 327 : public iterator<input_iterator_tag, charT, 328 typename traits::off_type, unspecified, 329 charT> 330{ 331public: 332 typedef charT char_type; 333 typedef traits traits_type; 334 typedef typename traits::int_type int_type; 335 typedef basic_streambuf<charT,traits> streambuf_type; 336 typedef basic_istream<charT,traits> istream_type; 337 338 istreambuf_iterator() noexcept; 339 istreambuf_iterator(istream_type& s) noexcept; 340 istreambuf_iterator(streambuf_type* s) noexcept; 341 istreambuf_iterator(a-private-type) noexcept; 342 343 charT operator*() const; 344 pointer operator->() const; 345 istreambuf_iterator& operator++(); 346 a-private-type operator++(int); 347 348 bool equal(const istreambuf_iterator& b) const; 349}; 350 351template <class charT, class traits> 352bool operator==(const istreambuf_iterator<charT,traits>& a, 353 const istreambuf_iterator<charT,traits>& b); 354template <class charT, class traits> 355bool operator!=(const istreambuf_iterator<charT,traits>& a, 356 const istreambuf_iterator<charT,traits>& b); 357 358template <class charT, class traits = char_traits<charT> > 359class ostreambuf_iterator 360 : public iterator<output_iterator_tag, void, void, void, void> 361{ 362public: 363 typedef charT char_type; 364 typedef traits traits_type; 365 typedef basic_streambuf<charT,traits> streambuf_type; 366 typedef basic_ostream<charT,traits> ostream_type; 367 368 ostreambuf_iterator(ostream_type& s) noexcept; 369 ostreambuf_iterator(streambuf_type* s) noexcept; 370 ostreambuf_iterator& operator=(charT c); 371 ostreambuf_iterator& operator*(); 372 ostreambuf_iterator& operator++(); 373 ostreambuf_iterator& operator++(int); 374 bool failed() const noexcept; 375}; 376 377template <class C> constexpr auto begin(C& c) -> decltype(c.begin()); 378template <class C> constexpr auto begin(const C& c) -> decltype(c.begin()); 379template <class C> constexpr auto end(C& c) -> decltype(c.end()); 380template <class C> constexpr auto end(const C& c) -> decltype(c.end()); 381template <class T, size_t N> constexpr T* begin(T (&array)[N]); 382template <class T, size_t N> constexpr T* end(T (&array)[N]); 383 384template <class C> auto constexpr cbegin(const C& c) -> decltype(std::begin(c)); // C++14 385template <class C> auto constexpr cend(const C& c) -> decltype(std::end(c)); // C++14 386template <class C> auto constexpr rbegin(C& c) -> decltype(c.rbegin()); // C++14 387template <class C> auto constexpr rbegin(const C& c) -> decltype(c.rbegin()); // C++14 388template <class C> auto constexpr rend(C& c) -> decltype(c.rend()); // C++14 389template <class C> constexpr auto rend(const C& c) -> decltype(c.rend()); // C++14 390template <class E> reverse_iterator<const E*> constexpr rbegin(initializer_list<E> il); // C++14 391template <class E> reverse_iterator<const E*> constexpr rend(initializer_list<E> il); // C++14 392template <class T, size_t N> reverse_iterator<T*> constexpr rbegin(T (&array)[N]); // C++14 393template <class T, size_t N> reverse_iterator<T*> constexpr rend(T (&array)[N]); // C++14 394template <class C> constexpr auto crbegin(const C& c) -> decltype(std::rbegin(c)); // C++14 395template <class C> constexpr auto crend(const C& c) -> decltype(std::rend(c)); // C++14 396 397// 24.8, container access: 398template <class C> constexpr auto size(const C& c) -> decltype(c.size()); // C++17 399template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17 400 401template <class C> constexpr auto ssize(const C& c) 402 -> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size())>>; // C++20 403template <class T, ptrdiff_t> constexpr ptrdiff_t ssize(const T (&array)[N]) noexcept; // C++20 404 405template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17 406template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17 407template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17 408template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17 409template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17 410template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17 411template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17 412 413} // std 414 415*/ 416 417#include <__config> 418#include <iosfwd> // for forward declarations of vector and string. 419#include <__functional_base> 420#include <type_traits> 421#include <cstddef> 422#include <initializer_list> 423#include <__memory/base.h> 424#include <__memory/pointer_traits.h> 425#include <version> 426 427#include <__debug> 428 429#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 430#pragma GCC system_header 431#endif 432 433_LIBCPP_BEGIN_NAMESPACE_STD 434template <class _Iter> 435struct _LIBCPP_TEMPLATE_VIS iterator_traits; 436 437struct _LIBCPP_TEMPLATE_VIS input_iterator_tag {}; 438struct _LIBCPP_TEMPLATE_VIS output_iterator_tag {}; 439struct _LIBCPP_TEMPLATE_VIS forward_iterator_tag : public input_iterator_tag {}; 440struct _LIBCPP_TEMPLATE_VIS bidirectional_iterator_tag : public forward_iterator_tag {}; 441struct _LIBCPP_TEMPLATE_VIS random_access_iterator_tag : public bidirectional_iterator_tag {}; 442#if _LIBCPP_STD_VER > 17 443struct _LIBCPP_TEMPLATE_VIS contiguous_iterator_tag : public random_access_iterator_tag {}; 444#endif 445 446template <class _Iter> 447struct __iter_traits_cache { 448 using type = _If< 449 __is_primary_template<iterator_traits<_Iter> >::value, 450 _Iter, 451 iterator_traits<_Iter> 452 >; 453}; 454template <class _Iter> 455using _ITER_TRAITS = typename __iter_traits_cache<_Iter>::type; 456 457struct __iter_concept_concept_test { 458 template <class _Iter> 459 using _Apply = typename _ITER_TRAITS<_Iter>::iterator_concept; 460}; 461struct __iter_concept_category_test { 462 template <class _Iter> 463 using _Apply = typename _ITER_TRAITS<_Iter>::iterator_category; 464}; 465struct __iter_concept_random_fallback { 466 template <class _Iter> 467 using _Apply = _EnableIf< 468 __is_primary_template<iterator_traits<_Iter> >::value, 469 random_access_iterator_tag 470 >; 471}; 472 473template <class _Iter, class _Tester> struct __test_iter_concept 474 : _IsValidExpansion<_Tester::template _Apply, _Iter>, 475 _Tester 476{ 477}; 478 479template <class _Iter> 480struct __iter_concept_cache { 481 using type = _Or< 482 __test_iter_concept<_Iter, __iter_concept_concept_test>, 483 __test_iter_concept<_Iter, __iter_concept_category_test>, 484 __test_iter_concept<_Iter, __iter_concept_random_fallback> 485 >; 486}; 487 488template <class _Iter> 489using _ITER_CONCEPT = typename __iter_concept_cache<_Iter>::type::template _Apply<_Iter>; 490 491 492template <class _Tp> 493struct __has_iterator_typedefs 494{ 495private: 496 struct __two {char __lx; char __lxx;}; 497 template <class _Up> static __two __test(...); 498 template <class _Up> static char __test(typename __void_t<typename _Up::iterator_category>::type* = 0, 499 typename __void_t<typename _Up::difference_type>::type* = 0, 500 typename __void_t<typename _Up::value_type>::type* = 0, 501 typename __void_t<typename _Up::reference>::type* = 0, 502 typename __void_t<typename _Up::pointer>::type* = 0); 503public: 504 static const bool value = sizeof(__test<_Tp>(0,0,0,0,0)) == 1; 505}; 506 507 508template <class _Tp> 509struct __has_iterator_category 510{ 511private: 512 struct __two {char __lx; char __lxx;}; 513 template <class _Up> static __two __test(...); 514 template <class _Up> static char __test(typename _Up::iterator_category* = nullptr); 515public: 516 static const bool value = sizeof(__test<_Tp>(nullptr)) == 1; 517}; 518 519template <class _Tp> 520struct __has_iterator_concept 521{ 522private: 523 struct __two {char __lx; char __lxx;}; 524 template <class _Up> static __two __test(...); 525 template <class _Up> static char __test(typename _Up::iterator_concept* = nullptr); 526public: 527 static const bool value = sizeof(__test<_Tp>(nullptr)) == 1; 528}; 529 530template <class _Iter, bool> struct __iterator_traits_impl {}; 531 532template <class _Iter> 533struct __iterator_traits_impl<_Iter, true> 534{ 535 typedef typename _Iter::difference_type difference_type; 536 typedef typename _Iter::value_type value_type; 537 typedef typename _Iter::pointer pointer; 538 typedef typename _Iter::reference reference; 539 typedef typename _Iter::iterator_category iterator_category; 540}; 541 542template <class _Iter, bool> struct __iterator_traits {}; 543 544template <class _Iter> 545struct __iterator_traits<_Iter, true> 546 : __iterator_traits_impl 547 < 548 _Iter, 549 is_convertible<typename _Iter::iterator_category, input_iterator_tag>::value || 550 is_convertible<typename _Iter::iterator_category, output_iterator_tag>::value 551 > 552{}; 553 554// iterator_traits<Iterator> will only have the nested types if Iterator::iterator_category 555// exists. Else iterator_traits<Iterator> will be an empty class. This is a 556// conforming extension which allows some programs to compile and behave as 557// the client expects instead of failing at compile time. 558 559template <class _Iter> 560struct _LIBCPP_TEMPLATE_VIS iterator_traits 561 : __iterator_traits<_Iter, __has_iterator_typedefs<_Iter>::value> { 562 563 using __primary_template = iterator_traits; 564}; 565 566template<class _Tp> 567struct _LIBCPP_TEMPLATE_VIS iterator_traits<_Tp*> 568{ 569 typedef ptrdiff_t difference_type; 570 typedef typename remove_cv<_Tp>::type value_type; 571 typedef _Tp* pointer; 572 typedef _Tp& reference; 573 typedef random_access_iterator_tag iterator_category; 574#if _LIBCPP_STD_VER > 17 575 typedef contiguous_iterator_tag iterator_concept; 576#endif 577}; 578 579template <class _Tp, class _Up, bool = __has_iterator_category<iterator_traits<_Tp> >::value> 580struct __has_iterator_category_convertible_to 581 : _BoolConstant<is_convertible<typename iterator_traits<_Tp>::iterator_category, _Up>::value> 582{}; 583 584template <class _Tp, class _Up> 585struct __has_iterator_category_convertible_to<_Tp, _Up, false> : false_type {}; 586 587template <class _Tp, class _Up, bool = __has_iterator_concept<_Tp>::value> 588struct __has_iterator_concept_convertible_to 589 : _BoolConstant<is_convertible<typename _Tp::iterator_concept, _Up>::value> 590{}; 591 592template <class _Tp, class _Up> 593struct __has_iterator_concept_convertible_to<_Tp, _Up, false> : false_type {}; 594 595template <class _Tp> 596struct __is_cpp17_input_iterator : public __has_iterator_category_convertible_to<_Tp, input_iterator_tag> {}; 597 598template <class _Tp> 599struct __is_cpp17_forward_iterator : public __has_iterator_category_convertible_to<_Tp, forward_iterator_tag> {}; 600 601template <class _Tp> 602struct __is_cpp17_bidirectional_iterator : public __has_iterator_category_convertible_to<_Tp, bidirectional_iterator_tag> {}; 603 604template <class _Tp> 605struct __is_cpp17_random_access_iterator : public __has_iterator_category_convertible_to<_Tp, random_access_iterator_tag> {}; 606 607// __is_cpp17_contiguous_iterator determines if an iterator is contiguous, 608// either because it advertises itself as such (in C++20) or because it 609// is a pointer type or a known trivial wrapper around a pointer type, 610// such as __wrap_iter<T*>. 611// 612#if _LIBCPP_STD_VER > 17 613template <class _Tp> 614struct __is_cpp17_contiguous_iterator : _Or< 615 __has_iterator_category_convertible_to<_Tp, contiguous_iterator_tag>, 616 __has_iterator_concept_convertible_to<_Tp, contiguous_iterator_tag> 617> {}; 618#else 619template <class _Tp> 620struct __is_cpp17_contiguous_iterator : false_type {}; 621#endif 622 623// Any native pointer which is an iterator is also a contiguous iterator. 624template <class _Up> 625struct __is_cpp17_contiguous_iterator<_Up*> : true_type {}; 626 627 628template <class _Tp> 629struct __is_exactly_cpp17_input_iterator 630 : public integral_constant<bool, 631 __has_iterator_category_convertible_to<_Tp, input_iterator_tag>::value && 632 !__has_iterator_category_convertible_to<_Tp, forward_iterator_tag>::value> {}; 633 634#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES 635template<class _InputIterator> 636using __iter_value_type = typename iterator_traits<_InputIterator>::value_type; 637 638template<class _InputIterator> 639using __iter_key_type = remove_const_t<typename iterator_traits<_InputIterator>::value_type::first_type>; 640 641template<class _InputIterator> 642using __iter_mapped_type = typename iterator_traits<_InputIterator>::value_type::second_type; 643 644template<class _InputIterator> 645using __iter_to_alloc_type = pair< 646 add_const_t<typename iterator_traits<_InputIterator>::value_type::first_type>, 647 typename iterator_traits<_InputIterator>::value_type::second_type>; 648#endif 649 650template<class _Category, class _Tp, class _Distance = ptrdiff_t, 651 class _Pointer = _Tp*, class _Reference = _Tp&> 652struct _LIBCPP_TEMPLATE_VIS iterator 653{ 654 typedef _Tp value_type; 655 typedef _Distance difference_type; 656 typedef _Pointer pointer; 657 typedef _Reference reference; 658 typedef _Category iterator_category; 659}; 660 661template <class _InputIter> 662inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 663void __advance(_InputIter& __i, 664 typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag) 665{ 666 for (; __n > 0; --__n) 667 ++__i; 668} 669 670template <class _BiDirIter> 671inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 672void __advance(_BiDirIter& __i, 673 typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag) 674{ 675 if (__n >= 0) 676 for (; __n > 0; --__n) 677 ++__i; 678 else 679 for (; __n < 0; ++__n) 680 --__i; 681} 682 683template <class _RandIter> 684inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 685void __advance(_RandIter& __i, 686 typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag) 687{ 688 __i += __n; 689} 690 691template <class _InputIter, class _Distance> 692inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 693void advance(_InputIter& __i, _Distance __orig_n) 694{ 695 _LIBCPP_ASSERT(__orig_n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 696 "Attempt to advance(it, n) with negative n on a non-bidirectional iterator"); 697 typedef decltype(_VSTD::__convert_to_integral(__orig_n)) _IntegralSize; 698 _IntegralSize __n = __orig_n; 699 _VSTD::__advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category()); 700} 701 702template <class _InputIter> 703inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 704typename iterator_traits<_InputIter>::difference_type 705__distance(_InputIter __first, _InputIter __last, input_iterator_tag) 706{ 707 typename iterator_traits<_InputIter>::difference_type __r(0); 708 for (; __first != __last; ++__first) 709 ++__r; 710 return __r; 711} 712 713template <class _RandIter> 714inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 715typename iterator_traits<_RandIter>::difference_type 716__distance(_RandIter __first, _RandIter __last, random_access_iterator_tag) 717{ 718 return __last - __first; 719} 720 721template <class _InputIter> 722inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 723typename iterator_traits<_InputIter>::difference_type 724distance(_InputIter __first, _InputIter __last) 725{ 726 return _VSTD::__distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category()); 727} 728 729template <class _InputIter> 730inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 731typename enable_if 732< 733 __is_cpp17_input_iterator<_InputIter>::value, 734 _InputIter 735>::type 736next(_InputIter __x, 737 typename iterator_traits<_InputIter>::difference_type __n = 1) 738{ 739 _LIBCPP_ASSERT(__n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 740 "Attempt to next(it, n) with negative n on a non-bidirectional iterator"); 741 742 _VSTD::advance(__x, __n); 743 return __x; 744} 745 746template <class _InputIter> 747inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 748typename enable_if 749< 750 __is_cpp17_input_iterator<_InputIter>::value, 751 _InputIter 752>::type 753prev(_InputIter __x, 754 typename iterator_traits<_InputIter>::difference_type __n = 1) 755{ 756 _LIBCPP_ASSERT(__n <= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 757 "Attempt to prev(it, n) with a positive n on a non-bidirectional iterator"); 758 _VSTD::advance(__x, -__n); 759 return __x; 760} 761 762 763template <class _Tp, class = void> 764struct __is_stashing_iterator : false_type {}; 765 766template <class _Tp> 767struct __is_stashing_iterator<_Tp, typename __void_t<typename _Tp::__stashing_iterator_tag>::type> 768 : true_type {}; 769 770template <class _Iter> 771class _LIBCPP_TEMPLATE_VIS reverse_iterator 772 : public iterator<typename iterator_traits<_Iter>::iterator_category, 773 typename iterator_traits<_Iter>::value_type, 774 typename iterator_traits<_Iter>::difference_type, 775 typename iterator_traits<_Iter>::pointer, 776 typename iterator_traits<_Iter>::reference> 777{ 778private: 779 /*mutable*/ _Iter __t; // no longer used as of LWG #2360, not removed due to ABI break 780 781 static_assert(!__is_stashing_iterator<_Iter>::value, 782 "The specified iterator type cannot be used with reverse_iterator; " 783 "Using stashing iterators with reverse_iterator causes undefined behavior"); 784 785protected: 786 _Iter current; 787public: 788 typedef _Iter iterator_type; 789 typedef typename iterator_traits<_Iter>::difference_type difference_type; 790 typedef typename iterator_traits<_Iter>::reference reference; 791 typedef typename iterator_traits<_Iter>::pointer pointer; 792 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 793 random_access_iterator_tag, 794 typename iterator_traits<_Iter>::iterator_category> iterator_category; 795#if _LIBCPP_STD_VER > 17 796 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 797 random_access_iterator_tag, 798 bidirectional_iterator_tag> iterator_concept; 799#endif 800 801 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 802 reverse_iterator() : __t(), current() {} 803 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 804 explicit reverse_iterator(_Iter __x) : __t(__x), current(__x) {} 805 template <class _Up> 806 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 807 reverse_iterator(const reverse_iterator<_Up>& __u) : __t(__u.base()), current(__u.base()) {} 808 template <class _Up> 809 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 810 reverse_iterator& operator=(const reverse_iterator<_Up>& __u) 811 { __t = current = __u.base(); return *this; } 812 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 813 _Iter base() const {return current;} 814 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 815 reference operator*() const {_Iter __tmp = current; return *--__tmp;} 816 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 817 pointer operator->() const {return _VSTD::addressof(operator*());} 818 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 819 reverse_iterator& operator++() {--current; return *this;} 820 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 821 reverse_iterator operator++(int) {reverse_iterator __tmp(*this); --current; return __tmp;} 822 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 823 reverse_iterator& operator--() {++current; return *this;} 824 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 825 reverse_iterator operator--(int) {reverse_iterator __tmp(*this); ++current; return __tmp;} 826 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 827 reverse_iterator operator+ (difference_type __n) const {return reverse_iterator(current - __n);} 828 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 829 reverse_iterator& operator+=(difference_type __n) {current -= __n; return *this;} 830 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 831 reverse_iterator operator- (difference_type __n) const {return reverse_iterator(current + __n);} 832 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 833 reverse_iterator& operator-=(difference_type __n) {current += __n; return *this;} 834 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 835 reference operator[](difference_type __n) const {return *(*this + __n);} 836}; 837 838template <class _Iter1, class _Iter2> 839inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 840bool 841operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 842{ 843 return __x.base() == __y.base(); 844} 845 846template <class _Iter1, class _Iter2> 847inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 848bool 849operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 850{ 851 return __x.base() > __y.base(); 852} 853 854template <class _Iter1, class _Iter2> 855inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 856bool 857operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 858{ 859 return __x.base() != __y.base(); 860} 861 862template <class _Iter1, class _Iter2> 863inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 864bool 865operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 866{ 867 return __x.base() < __y.base(); 868} 869 870template <class _Iter1, class _Iter2> 871inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 872bool 873operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 874{ 875 return __x.base() <= __y.base(); 876} 877 878template <class _Iter1, class _Iter2> 879inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 880bool 881operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 882{ 883 return __x.base() >= __y.base(); 884} 885 886#ifndef _LIBCPP_CXX03_LANG 887template <class _Iter1, class _Iter2> 888inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 889auto 890operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 891-> decltype(__y.base() - __x.base()) 892{ 893 return __y.base() - __x.base(); 894} 895#else 896template <class _Iter1, class _Iter2> 897inline _LIBCPP_INLINE_VISIBILITY 898typename reverse_iterator<_Iter1>::difference_type 899operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 900{ 901 return __y.base() - __x.base(); 902} 903#endif 904 905template <class _Iter> 906inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 907reverse_iterator<_Iter> 908operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_iterator<_Iter>& __x) 909{ 910 return reverse_iterator<_Iter>(__x.base() - __n); 911} 912 913#if _LIBCPP_STD_VER > 11 914template <class _Iter> 915inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 916reverse_iterator<_Iter> make_reverse_iterator(_Iter __i) 917{ 918 return reverse_iterator<_Iter>(__i); 919} 920#endif 921 922template <class _Container> 923class _LIBCPP_TEMPLATE_VIS back_insert_iterator 924 : public iterator<output_iterator_tag, 925 void, 926 void, 927 void, 928 void> 929{ 930protected: 931 _Container* container; 932public: 933 typedef _Container container_type; 934 935 _LIBCPP_INLINE_VISIBILITY explicit back_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {} 936 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(const typename _Container::value_type& __value_) 937 {container->push_back(__value_); return *this;} 938#ifndef _LIBCPP_CXX03_LANG 939 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator=(typename _Container::value_type&& __value_) 940 {container->push_back(_VSTD::move(__value_)); return *this;} 941#endif // _LIBCPP_CXX03_LANG 942 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator*() {return *this;} 943 _LIBCPP_INLINE_VISIBILITY back_insert_iterator& operator++() {return *this;} 944 _LIBCPP_INLINE_VISIBILITY back_insert_iterator operator++(int) {return *this;} 945}; 946 947template <class _Container> 948inline _LIBCPP_INLINE_VISIBILITY 949back_insert_iterator<_Container> 950back_inserter(_Container& __x) 951{ 952 return back_insert_iterator<_Container>(__x); 953} 954 955template <class _Container> 956class _LIBCPP_TEMPLATE_VIS front_insert_iterator 957 : public iterator<output_iterator_tag, 958 void, 959 void, 960 void, 961 void> 962{ 963protected: 964 _Container* container; 965public: 966 typedef _Container container_type; 967 968 _LIBCPP_INLINE_VISIBILITY explicit front_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {} 969 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(const typename _Container::value_type& __value_) 970 {container->push_front(__value_); return *this;} 971#ifndef _LIBCPP_CXX03_LANG 972 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator=(typename _Container::value_type&& __value_) 973 {container->push_front(_VSTD::move(__value_)); return *this;} 974#endif // _LIBCPP_CXX03_LANG 975 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator*() {return *this;} 976 _LIBCPP_INLINE_VISIBILITY front_insert_iterator& operator++() {return *this;} 977 _LIBCPP_INLINE_VISIBILITY front_insert_iterator operator++(int) {return *this;} 978}; 979 980template <class _Container> 981inline _LIBCPP_INLINE_VISIBILITY 982front_insert_iterator<_Container> 983front_inserter(_Container& __x) 984{ 985 return front_insert_iterator<_Container>(__x); 986} 987 988template <class _Container> 989class _LIBCPP_TEMPLATE_VIS insert_iterator 990 : public iterator<output_iterator_tag, 991 void, 992 void, 993 void, 994 void> 995{ 996protected: 997 _Container* container; 998 typename _Container::iterator iter; 999public: 1000 typedef _Container container_type; 1001 1002 _LIBCPP_INLINE_VISIBILITY insert_iterator(_Container& __x, typename _Container::iterator __i) 1003 : container(_VSTD::addressof(__x)), iter(__i) {} 1004 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(const typename _Container::value_type& __value_) 1005 {iter = container->insert(iter, __value_); ++iter; return *this;} 1006#ifndef _LIBCPP_CXX03_LANG 1007 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator=(typename _Container::value_type&& __value_) 1008 {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;} 1009#endif // _LIBCPP_CXX03_LANG 1010 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator*() {return *this;} 1011 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++() {return *this;} 1012 _LIBCPP_INLINE_VISIBILITY insert_iterator& operator++(int) {return *this;} 1013}; 1014 1015template <class _Container> 1016inline _LIBCPP_INLINE_VISIBILITY 1017insert_iterator<_Container> 1018inserter(_Container& __x, typename _Container::iterator __i) 1019{ 1020 return insert_iterator<_Container>(__x, __i); 1021} 1022 1023template <class _Tp, class _CharT = char, 1024 class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t> 1025class _LIBCPP_TEMPLATE_VIS istream_iterator 1026 : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&> 1027{ 1028public: 1029 typedef _CharT char_type; 1030 typedef _Traits traits_type; 1031 typedef basic_istream<_CharT,_Traits> istream_type; 1032private: 1033 istream_type* __in_stream_; 1034 _Tp __value_; 1035public: 1036 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {} 1037 _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s)) 1038 { 1039 if (!(*__in_stream_ >> __value_)) 1040 __in_stream_ = nullptr; 1041 } 1042 1043 _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;} 1044 _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));} 1045 _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++() 1046 { 1047 if (!(*__in_stream_ >> __value_)) 1048 __in_stream_ = nullptr; 1049 return *this; 1050 } 1051 _LIBCPP_INLINE_VISIBILITY istream_iterator operator++(int) 1052 {istream_iterator __t(*this); ++(*this); return __t;} 1053 1054 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 1055 friend _LIBCPP_INLINE_VISIBILITY 1056 bool 1057 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 1058 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 1059 1060 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 1061 friend _LIBCPP_INLINE_VISIBILITY 1062 bool 1063 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 1064 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 1065}; 1066 1067template <class _Tp, class _CharT, class _Traits, class _Distance> 1068inline _LIBCPP_INLINE_VISIBILITY 1069bool 1070operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 1071 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 1072{ 1073 return __x.__in_stream_ == __y.__in_stream_; 1074} 1075 1076template <class _Tp, class _CharT, class _Traits, class _Distance> 1077inline _LIBCPP_INLINE_VISIBILITY 1078bool 1079operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 1080 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 1081{ 1082 return !(__x == __y); 1083} 1084 1085template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT> > 1086class _LIBCPP_TEMPLATE_VIS ostream_iterator 1087 : public iterator<output_iterator_tag, void, void, void, void> 1088{ 1089public: 1090 typedef output_iterator_tag iterator_category; 1091 typedef void value_type; 1092#if _LIBCPP_STD_VER > 17 1093 typedef std::ptrdiff_t difference_type; 1094#else 1095 typedef void difference_type; 1096#endif 1097 typedef void pointer; 1098 typedef void reference; 1099 typedef _CharT char_type; 1100 typedef _Traits traits_type; 1101 typedef basic_ostream<_CharT, _Traits> ostream_type; 1102 1103private: 1104 ostream_type* __out_stream_; 1105 const char_type* __delim_; 1106public: 1107 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s) _NOEXCEPT 1108 : __out_stream_(_VSTD::addressof(__s)), __delim_(nullptr) {} 1109 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter) _NOEXCEPT 1110 : __out_stream_(_VSTD::addressof(__s)), __delim_(__delimiter) {} 1111 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator=(const _Tp& __value_) 1112 { 1113 *__out_stream_ << __value_; 1114 if (__delim_) 1115 *__out_stream_ << __delim_; 1116 return *this; 1117 } 1118 1119 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator*() {return *this;} 1120 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++() {return *this;} 1121 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++(int) {return *this;} 1122}; 1123 1124template<class _CharT, class _Traits> 1125class _LIBCPP_TEMPLATE_VIS istreambuf_iterator 1126 : public iterator<input_iterator_tag, _CharT, 1127 typename _Traits::off_type, _CharT*, 1128 _CharT> 1129{ 1130public: 1131 typedef _CharT char_type; 1132 typedef _Traits traits_type; 1133 typedef typename _Traits::int_type int_type; 1134 typedef basic_streambuf<_CharT,_Traits> streambuf_type; 1135 typedef basic_istream<_CharT,_Traits> istream_type; 1136private: 1137 mutable streambuf_type* __sbuf_; 1138 1139 class __proxy 1140 { 1141 char_type __keep_; 1142 streambuf_type* __sbuf_; 1143 _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s) 1144 : __keep_(__c), __sbuf_(__s) {} 1145 friend class istreambuf_iterator; 1146 public: 1147 _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;} 1148 }; 1149 1150 _LIBCPP_INLINE_VISIBILITY 1151 bool __test_for_eof() const 1152 { 1153 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof())) 1154 __sbuf_ = nullptr; 1155 return __sbuf_ == nullptr; 1156 } 1157public: 1158 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {} 1159 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT 1160 : __sbuf_(__s.rdbuf()) {} 1161 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT 1162 : __sbuf_(__s) {} 1163 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT 1164 : __sbuf_(__p.__sbuf_) {} 1165 1166 _LIBCPP_INLINE_VISIBILITY char_type operator*() const 1167 {return static_cast<char_type>(__sbuf_->sgetc());} 1168 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++() 1169 { 1170 __sbuf_->sbumpc(); 1171 return *this; 1172 } 1173 _LIBCPP_INLINE_VISIBILITY __proxy operator++(int) 1174 { 1175 return __proxy(__sbuf_->sbumpc(), __sbuf_); 1176 } 1177 1178 _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const 1179 {return __test_for_eof() == __b.__test_for_eof();} 1180}; 1181 1182template <class _CharT, class _Traits> 1183inline _LIBCPP_INLINE_VISIBILITY 1184bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a, 1185 const istreambuf_iterator<_CharT,_Traits>& __b) 1186 {return __a.equal(__b);} 1187 1188template <class _CharT, class _Traits> 1189inline _LIBCPP_INLINE_VISIBILITY 1190bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a, 1191 const istreambuf_iterator<_CharT,_Traits>& __b) 1192 {return !__a.equal(__b);} 1193 1194template <class _CharT, class _Traits> 1195class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator 1196 : public iterator<output_iterator_tag, void, void, void, void> 1197{ 1198public: 1199 typedef output_iterator_tag iterator_category; 1200 typedef void value_type; 1201#if _LIBCPP_STD_VER > 17 1202 typedef std::ptrdiff_t difference_type; 1203#else 1204 typedef void difference_type; 1205#endif 1206 typedef void pointer; 1207 typedef void reference; 1208 typedef _CharT char_type; 1209 typedef _Traits traits_type; 1210 typedef basic_streambuf<_CharT, _Traits> streambuf_type; 1211 typedef basic_ostream<_CharT, _Traits> ostream_type; 1212 1213private: 1214 streambuf_type* __sbuf_; 1215public: 1216 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) _NOEXCEPT 1217 : __sbuf_(__s.rdbuf()) {} 1218 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT 1219 : __sbuf_(__s) {} 1220 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c) 1221 { 1222 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof())) 1223 __sbuf_ = nullptr; 1224 return *this; 1225 } 1226 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*() {return *this;} 1227 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++() {return *this;} 1228 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;} 1229 _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == nullptr;} 1230 1231 template <class _Ch, class _Tr> 1232 friend 1233 _LIBCPP_HIDDEN 1234 ostreambuf_iterator<_Ch, _Tr> 1235 __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s, 1236 const _Ch* __ob, const _Ch* __op, const _Ch* __oe, 1237 ios_base& __iob, _Ch __fl); 1238}; 1239 1240template <class _Iter> 1241class _LIBCPP_TEMPLATE_VIS move_iterator 1242{ 1243private: 1244 _Iter __i; 1245public: 1246 typedef _Iter iterator_type; 1247 typedef typename iterator_traits<iterator_type>::value_type value_type; 1248 typedef typename iterator_traits<iterator_type>::difference_type difference_type; 1249 typedef iterator_type pointer; 1250 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 1251 random_access_iterator_tag, 1252 typename iterator_traits<_Iter>::iterator_category> iterator_category; 1253#if _LIBCPP_STD_VER > 17 1254 typedef input_iterator_tag iterator_concept; 1255#endif 1256 1257#ifndef _LIBCPP_CXX03_LANG 1258 typedef typename iterator_traits<iterator_type>::reference __reference; 1259 typedef typename conditional< 1260 is_reference<__reference>::value, 1261 typename remove_reference<__reference>::type&&, 1262 __reference 1263 >::type reference; 1264#else 1265 typedef typename iterator_traits<iterator_type>::reference reference; 1266#endif 1267 1268 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1269 move_iterator() : __i() {} 1270 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1271 explicit move_iterator(_Iter __x) : __i(__x) {} 1272 template <class _Up> 1273 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1274 move_iterator(const move_iterator<_Up>& __u) : __i(__u.base()) {} 1275 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 _Iter base() const {return __i;} 1276 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1277 reference operator*() const { return static_cast<reference>(*__i); } 1278 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1279 pointer operator->() const { return __i;} 1280 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1281 move_iterator& operator++() {++__i; return *this;} 1282 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1283 move_iterator operator++(int) {move_iterator __tmp(*this); ++__i; return __tmp;} 1284 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1285 move_iterator& operator--() {--__i; return *this;} 1286 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1287 move_iterator operator--(int) {move_iterator __tmp(*this); --__i; return __tmp;} 1288 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1289 move_iterator operator+ (difference_type __n) const {return move_iterator(__i + __n);} 1290 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1291 move_iterator& operator+=(difference_type __n) {__i += __n; return *this;} 1292 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1293 move_iterator operator- (difference_type __n) const {return move_iterator(__i - __n);} 1294 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1295 move_iterator& operator-=(difference_type __n) {__i -= __n; return *this;} 1296 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1297 reference operator[](difference_type __n) const { return static_cast<reference>(__i[__n]); } 1298}; 1299 1300template <class _Iter1, class _Iter2> 1301inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1302bool 1303operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1304{ 1305 return __x.base() == __y.base(); 1306} 1307 1308template <class _Iter1, class _Iter2> 1309inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1310bool 1311operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1312{ 1313 return __x.base() < __y.base(); 1314} 1315 1316template <class _Iter1, class _Iter2> 1317inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1318bool 1319operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1320{ 1321 return __x.base() != __y.base(); 1322} 1323 1324template <class _Iter1, class _Iter2> 1325inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1326bool 1327operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1328{ 1329 return __x.base() > __y.base(); 1330} 1331 1332template <class _Iter1, class _Iter2> 1333inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1334bool 1335operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1336{ 1337 return __x.base() >= __y.base(); 1338} 1339 1340template <class _Iter1, class _Iter2> 1341inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1342bool 1343operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1344{ 1345 return __x.base() <= __y.base(); 1346} 1347 1348#ifndef _LIBCPP_CXX03_LANG 1349template <class _Iter1, class _Iter2> 1350inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1351auto 1352operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1353-> decltype(__x.base() - __y.base()) 1354{ 1355 return __x.base() - __y.base(); 1356} 1357#else 1358template <class _Iter1, class _Iter2> 1359inline _LIBCPP_INLINE_VISIBILITY 1360typename move_iterator<_Iter1>::difference_type 1361operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1362{ 1363 return __x.base() - __y.base(); 1364} 1365#endif 1366 1367template <class _Iter> 1368inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1369move_iterator<_Iter> 1370operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x) 1371{ 1372 return move_iterator<_Iter>(__x.base() + __n); 1373} 1374 1375template <class _Iter> 1376inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1377move_iterator<_Iter> 1378make_move_iterator(_Iter __i) 1379{ 1380 return move_iterator<_Iter>(__i); 1381} 1382 1383// __wrap_iter 1384 1385template <class _Iter> class __wrap_iter; 1386 1387template <class _Iter1, class _Iter2> 1388_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1389bool 1390operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1391 1392template <class _Iter1, class _Iter2> 1393_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1394bool 1395operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1396 1397template <class _Iter1, class _Iter2> 1398_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1399bool 1400operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1401 1402template <class _Iter1, class _Iter2> 1403_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1404bool 1405operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1406 1407template <class _Iter1, class _Iter2> 1408_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1409bool 1410operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1411 1412template <class _Iter1, class _Iter2> 1413_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1414bool 1415operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1416 1417#ifndef _LIBCPP_CXX03_LANG 1418template <class _Iter1, class _Iter2> 1419_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1420auto 1421operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1422-> decltype(__x.base() - __y.base()); 1423#else 1424template <class _Iter1, class _Iter2> 1425_LIBCPP_INLINE_VISIBILITY 1426typename __wrap_iter<_Iter1>::difference_type 1427operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1428#endif 1429 1430template <class _Iter> 1431_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1432__wrap_iter<_Iter> 1433operator+(typename __wrap_iter<_Iter>::difference_type, __wrap_iter<_Iter>) _NOEXCEPT; 1434 1435template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 copy(_Ip, _Ip, _Op); 1436template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 copy_backward(_B1, _B1, _B2); 1437template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 move(_Ip, _Ip, _Op); 1438template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 move_backward(_B1, _B1, _B2); 1439 1440template <class _Iter> 1441class __wrap_iter 1442{ 1443public: 1444 typedef _Iter iterator_type; 1445 typedef typename iterator_traits<iterator_type>::value_type value_type; 1446 typedef typename iterator_traits<iterator_type>::difference_type difference_type; 1447 typedef typename iterator_traits<iterator_type>::pointer pointer; 1448 typedef typename iterator_traits<iterator_type>::reference reference; 1449 typedef typename iterator_traits<iterator_type>::iterator_category iterator_category; 1450#if _LIBCPP_STD_VER > 17 1451 typedef _If<__is_cpp17_contiguous_iterator<_Iter>::value, 1452 contiguous_iterator_tag, iterator_category> iterator_concept; 1453#endif 1454 1455private: 1456 iterator_type __i; 1457public: 1458 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter() _NOEXCEPT 1459#if _LIBCPP_STD_VER > 11 1460 : __i{} 1461#endif 1462 { 1463#if _LIBCPP_DEBUG_LEVEL == 2 1464 __get_db()->__insert_i(this); 1465#endif 1466 } 1467 template <class _Up> _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1468 __wrap_iter(const __wrap_iter<_Up>& __u, 1469 typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = nullptr) _NOEXCEPT 1470 : __i(__u.base()) 1471 { 1472#if _LIBCPP_DEBUG_LEVEL == 2 1473 __get_db()->__iterator_copy(this, &__u); 1474#endif 1475 } 1476#if _LIBCPP_DEBUG_LEVEL == 2 1477 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1478 __wrap_iter(const __wrap_iter& __x) 1479 : __i(__x.base()) 1480 { 1481 __get_db()->__iterator_copy(this, &__x); 1482 } 1483 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1484 __wrap_iter& operator=(const __wrap_iter& __x) 1485 { 1486 if (this != &__x) 1487 { 1488 __get_db()->__iterator_copy(this, &__x); 1489 __i = __x.__i; 1490 } 1491 return *this; 1492 } 1493 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1494 ~__wrap_iter() 1495 { 1496 __get_db()->__erase_i(this); 1497 } 1498#endif 1499 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator*() const _NOEXCEPT 1500 { 1501#if _LIBCPP_DEBUG_LEVEL == 2 1502 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1503 "Attempted to dereference a non-dereferenceable iterator"); 1504#endif 1505 return *__i; 1506 } 1507 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG pointer operator->() const _NOEXCEPT 1508 { 1509#if _LIBCPP_DEBUG_LEVEL == 2 1510 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1511 "Attempted to dereference a non-dereferenceable iterator"); 1512#endif 1513 return (pointer)_VSTD::addressof(*__i); 1514 } 1515 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator++() _NOEXCEPT 1516 { 1517#if _LIBCPP_DEBUG_LEVEL == 2 1518 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1519 "Attempted to increment non-incrementable iterator"); 1520#endif 1521 ++__i; 1522 return *this; 1523 } 1524 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator++(int) _NOEXCEPT 1525 {__wrap_iter __tmp(*this); ++(*this); return __tmp;} 1526 1527 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator--() _NOEXCEPT 1528 { 1529#if _LIBCPP_DEBUG_LEVEL == 2 1530 _LIBCPP_ASSERT(__get_const_db()->__decrementable(this), 1531 "Attempted to decrement non-decrementable iterator"); 1532#endif 1533 --__i; 1534 return *this; 1535 } 1536 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator--(int) _NOEXCEPT 1537 {__wrap_iter __tmp(*this); --(*this); return __tmp;} 1538 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator+ (difference_type __n) const _NOEXCEPT 1539 {__wrap_iter __w(*this); __w += __n; return __w;} 1540 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator+=(difference_type __n) _NOEXCEPT 1541 { 1542#if _LIBCPP_DEBUG_LEVEL == 2 1543 _LIBCPP_ASSERT(__get_const_db()->__addable(this, __n), 1544 "Attempted to add/subtract iterator outside of valid range"); 1545#endif 1546 __i += __n; 1547 return *this; 1548 } 1549 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator- (difference_type __n) const _NOEXCEPT 1550 {return *this + (-__n);} 1551 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator-=(difference_type __n) _NOEXCEPT 1552 {*this += -__n; return *this;} 1553 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator[](difference_type __n) const _NOEXCEPT 1554 { 1555#if _LIBCPP_DEBUG_LEVEL == 2 1556 _LIBCPP_ASSERT(__get_const_db()->__subscriptable(this, __n), 1557 "Attempted to subscript iterator outside of valid range"); 1558#endif 1559 return __i[__n]; 1560 } 1561 1562 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG iterator_type base() const _NOEXCEPT {return __i;} 1563 1564private: 1565#if _LIBCPP_DEBUG_LEVEL == 2 1566 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(const void* __p, iterator_type __x) : __i(__x) 1567 { 1568 __get_db()->__insert_ic(this, __p); 1569 } 1570#else 1571 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {} 1572#endif 1573 1574 template <class _Up> friend class __wrap_iter; 1575 template <class _CharT, class _Traits, class _Alloc> friend class basic_string; 1576 template <class _Tp, class _Alloc> friend class _LIBCPP_TEMPLATE_VIS vector; 1577 template <class _Tp, size_t> friend class _LIBCPP_TEMPLATE_VIS span; 1578 1579 template <class _Iter1, class _Iter2> 1580 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1581 bool 1582 operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1583 1584 template <class _Iter1, class _Iter2> 1585 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1586 bool 1587 operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1588 1589 template <class _Iter1, class _Iter2> 1590 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1591 bool 1592 operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1593 1594 template <class _Iter1, class _Iter2> 1595 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1596 bool 1597 operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1598 1599 template <class _Iter1, class _Iter2> 1600 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1601 bool 1602 operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1603 1604 template <class _Iter1, class _Iter2> 1605 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1606 bool 1607 operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1608 1609#ifndef _LIBCPP_CXX03_LANG 1610 template <class _Iter1, class _Iter2> 1611 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1612 auto 1613 operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1614 -> decltype(__x.base() - __y.base()); 1615#else 1616 template <class _Iter1, class _Iter2> 1617 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1618 typename __wrap_iter<_Iter1>::difference_type 1619 operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1620#endif 1621 1622 template <class _Iter1> 1623 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1624 __wrap_iter<_Iter1> 1625 operator+(typename __wrap_iter<_Iter1>::difference_type, __wrap_iter<_Iter1>) _NOEXCEPT; 1626 1627 template <class _Ip, class _Op> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _Op copy(_Ip, _Ip, _Op); 1628 template <class _B1, class _B2> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _B2 copy_backward(_B1, _B1, _B2); 1629 template <class _Ip, class _Op> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _Op move(_Ip, _Ip, _Op); 1630 template <class _B1, class _B2> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _B2 move_backward(_B1, _B1, _B2); 1631}; 1632 1633#if _LIBCPP_STD_VER <= 17 1634template <class _It> 1635struct __is_cpp17_contiguous_iterator<__wrap_iter<_It> > : __is_cpp17_contiguous_iterator<_It> {}; 1636#endif 1637 1638template <class _Iter> 1639_LIBCPP_CONSTEXPR 1640_EnableIf<__is_cpp17_contiguous_iterator<_Iter>::value, decltype(_VSTD::__to_address(declval<_Iter>()))> 1641__to_address(__wrap_iter<_Iter> __w) _NOEXCEPT { 1642 return _VSTD::__to_address(__w.base()); 1643} 1644 1645template <class _Iter1, class _Iter2> 1646inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1647bool 1648operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1649{ 1650 return __x.base() == __y.base(); 1651} 1652 1653template <class _Iter1, class _Iter2> 1654inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1655bool 1656operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1657{ 1658#if _LIBCPP_DEBUG_LEVEL == 2 1659 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1660 "Attempted to compare incomparable iterators"); 1661#endif 1662 return __x.base() < __y.base(); 1663} 1664 1665template <class _Iter1, class _Iter2> 1666inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1667bool 1668operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1669{ 1670 return !(__x == __y); 1671} 1672 1673template <class _Iter1, class _Iter2> 1674inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1675bool 1676operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1677{ 1678 return __y < __x; 1679} 1680 1681template <class _Iter1, class _Iter2> 1682inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1683bool 1684operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1685{ 1686 return !(__x < __y); 1687} 1688 1689template <class _Iter1, class _Iter2> 1690inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1691bool 1692operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1693{ 1694 return !(__y < __x); 1695} 1696 1697template <class _Iter1> 1698inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1699bool 1700operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1701{ 1702 return !(__x == __y); 1703} 1704 1705template <class _Iter1> 1706inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1707bool 1708operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1709{ 1710 return __y < __x; 1711} 1712 1713template <class _Iter1> 1714inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1715bool 1716operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1717{ 1718 return !(__x < __y); 1719} 1720 1721template <class _Iter1> 1722inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1723bool 1724operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1725{ 1726 return !(__y < __x); 1727} 1728 1729#ifndef _LIBCPP_CXX03_LANG 1730template <class _Iter1, class _Iter2> 1731inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1732auto 1733operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1734-> decltype(__x.base() - __y.base()) 1735{ 1736#if _LIBCPP_DEBUG_LEVEL == 2 1737 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1738 "Attempted to subtract incompatible iterators"); 1739#endif 1740 return __x.base() - __y.base(); 1741} 1742#else 1743template <class _Iter1, class _Iter2> 1744inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1745typename __wrap_iter<_Iter1>::difference_type 1746operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1747{ 1748#if _LIBCPP_DEBUG_LEVEL == 2 1749 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1750 "Attempted to subtract incompatible iterators"); 1751#endif 1752 return __x.base() - __y.base(); 1753} 1754#endif 1755 1756template <class _Iter> 1757inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1758__wrap_iter<_Iter> 1759operator+(typename __wrap_iter<_Iter>::difference_type __n, 1760 __wrap_iter<_Iter> __x) _NOEXCEPT 1761{ 1762 __x += __n; 1763 return __x; 1764} 1765 1766template <class _Iter> 1767struct __libcpp_is_trivial_iterator 1768 : public _LIBCPP_BOOL_CONSTANT(is_pointer<_Iter>::value) {}; 1769 1770template <class _Iter> 1771struct __libcpp_is_trivial_iterator<move_iterator<_Iter> > 1772 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {}; 1773 1774template <class _Iter> 1775struct __libcpp_is_trivial_iterator<reverse_iterator<_Iter> > 1776 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {}; 1777 1778template <class _Iter> 1779struct __libcpp_is_trivial_iterator<__wrap_iter<_Iter> > 1780 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {}; 1781 1782 1783template <class _Tp, size_t _Np> 1784_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1785_Tp* 1786begin(_Tp (&__array)[_Np]) 1787{ 1788 return __array; 1789} 1790 1791template <class _Tp, size_t _Np> 1792_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1793_Tp* 1794end(_Tp (&__array)[_Np]) 1795{ 1796 return __array + _Np; 1797} 1798 1799#if !defined(_LIBCPP_CXX03_LANG) 1800 1801template <class _Cp> 1802_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1803auto 1804begin(_Cp& __c) -> decltype(__c.begin()) 1805{ 1806 return __c.begin(); 1807} 1808 1809template <class _Cp> 1810_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1811auto 1812begin(const _Cp& __c) -> decltype(__c.begin()) 1813{ 1814 return __c.begin(); 1815} 1816 1817template <class _Cp> 1818_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1819auto 1820end(_Cp& __c) -> decltype(__c.end()) 1821{ 1822 return __c.end(); 1823} 1824 1825template <class _Cp> 1826_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1827auto 1828end(const _Cp& __c) -> decltype(__c.end()) 1829{ 1830 return __c.end(); 1831} 1832 1833#if _LIBCPP_STD_VER > 11 1834 1835template <class _Tp, size_t _Np> 1836_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1837reverse_iterator<_Tp*> rbegin(_Tp (&__array)[_Np]) 1838{ 1839 return reverse_iterator<_Tp*>(__array + _Np); 1840} 1841 1842template <class _Tp, size_t _Np> 1843_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1844reverse_iterator<_Tp*> rend(_Tp (&__array)[_Np]) 1845{ 1846 return reverse_iterator<_Tp*>(__array); 1847} 1848 1849template <class _Ep> 1850_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1851reverse_iterator<const _Ep*> rbegin(initializer_list<_Ep> __il) 1852{ 1853 return reverse_iterator<const _Ep*>(__il.end()); 1854} 1855 1856template <class _Ep> 1857_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1858reverse_iterator<const _Ep*> rend(initializer_list<_Ep> __il) 1859{ 1860 return reverse_iterator<const _Ep*>(__il.begin()); 1861} 1862 1863template <class _Cp> 1864_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1865auto cbegin(const _Cp& __c) -> decltype(_VSTD::begin(__c)) 1866{ 1867 return _VSTD::begin(__c); 1868} 1869 1870template <class _Cp> 1871_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1872auto cend(const _Cp& __c) -> decltype(_VSTD::end(__c)) 1873{ 1874 return _VSTD::end(__c); 1875} 1876 1877template <class _Cp> 1878_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1879auto rbegin(_Cp& __c) -> decltype(__c.rbegin()) 1880{ 1881 return __c.rbegin(); 1882} 1883 1884template <class _Cp> 1885_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1886auto rbegin(const _Cp& __c) -> decltype(__c.rbegin()) 1887{ 1888 return __c.rbegin(); 1889} 1890 1891template <class _Cp> 1892_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1893auto rend(_Cp& __c) -> decltype(__c.rend()) 1894{ 1895 return __c.rend(); 1896} 1897 1898template <class _Cp> 1899_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1900auto rend(const _Cp& __c) -> decltype(__c.rend()) 1901{ 1902 return __c.rend(); 1903} 1904 1905template <class _Cp> 1906_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1907auto crbegin(const _Cp& __c) -> decltype(_VSTD::rbegin(__c)) 1908{ 1909 return _VSTD::rbegin(__c); 1910} 1911 1912template <class _Cp> 1913_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1914auto crend(const _Cp& __c) -> decltype(_VSTD::rend(__c)) 1915{ 1916 return _VSTD::rend(__c); 1917} 1918 1919#endif 1920 1921 1922#else // defined(_LIBCPP_CXX03_LANG) 1923 1924template <class _Cp> 1925_LIBCPP_INLINE_VISIBILITY 1926typename _Cp::iterator 1927begin(_Cp& __c) 1928{ 1929 return __c.begin(); 1930} 1931 1932template <class _Cp> 1933_LIBCPP_INLINE_VISIBILITY 1934typename _Cp::const_iterator 1935begin(const _Cp& __c) 1936{ 1937 return __c.begin(); 1938} 1939 1940template <class _Cp> 1941_LIBCPP_INLINE_VISIBILITY 1942typename _Cp::iterator 1943end(_Cp& __c) 1944{ 1945 return __c.end(); 1946} 1947 1948template <class _Cp> 1949_LIBCPP_INLINE_VISIBILITY 1950typename _Cp::const_iterator 1951end(const _Cp& __c) 1952{ 1953 return __c.end(); 1954} 1955 1956#endif // !defined(_LIBCPP_CXX03_LANG) 1957 1958#if _LIBCPP_STD_VER > 14 1959 1960// #if _LIBCPP_STD_VER > 11 1961// template <> 1962// struct _LIBCPP_TEMPLATE_VIS plus<void> 1963// { 1964// template <class _T1, class _T2> 1965// _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 1966// auto operator()(_T1&& __t, _T2&& __u) const 1967// _NOEXCEPT_(noexcept(_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u))) 1968// -> decltype (_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u)) 1969// { return _VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u); } 1970// typedef void is_transparent; 1971// }; 1972// #endif 1973 1974template <class _Cont> 1975_LIBCPP_INLINE_VISIBILITY 1976constexpr auto size(const _Cont& __c) 1977_NOEXCEPT_(noexcept(__c.size())) 1978-> decltype (__c.size()) 1979{ return __c.size(); } 1980 1981template <class _Tp, size_t _Sz> 1982_LIBCPP_INLINE_VISIBILITY 1983constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; } 1984 1985#if _LIBCPP_STD_VER > 17 1986template <class _Cont> 1987_LIBCPP_INLINE_VISIBILITY 1988constexpr auto ssize(const _Cont& __c) 1989_NOEXCEPT_(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()))) 1990-> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>> 1991{ return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); } 1992 1993template <class _Tp, ptrdiff_t _Sz> 1994_LIBCPP_INLINE_VISIBILITY 1995constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { return _Sz; } 1996#endif 1997 1998template <class _Cont> 1999_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 2000constexpr auto empty(const _Cont& __c) 2001_NOEXCEPT_(noexcept(__c.empty())) 2002-> decltype (__c.empty()) 2003{ return __c.empty(); } 2004 2005template <class _Tp, size_t _Sz> 2006_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 2007constexpr bool empty(const _Tp (&)[_Sz]) noexcept { return false; } 2008 2009template <class _Ep> 2010_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 2011constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; } 2012 2013template <class _Cont> constexpr 2014_LIBCPP_INLINE_VISIBILITY 2015auto data(_Cont& __c) 2016_NOEXCEPT_(noexcept(__c.data())) 2017-> decltype (__c.data()) 2018{ return __c.data(); } 2019 2020template <class _Cont> constexpr 2021_LIBCPP_INLINE_VISIBILITY 2022auto data(const _Cont& __c) 2023_NOEXCEPT_(noexcept(__c.data())) 2024-> decltype (__c.data()) 2025{ return __c.data(); } 2026 2027template <class _Tp, size_t _Sz> 2028_LIBCPP_INLINE_VISIBILITY 2029constexpr _Tp* data(_Tp (&__array)[_Sz]) noexcept { return __array; } 2030 2031template <class _Ep> 2032_LIBCPP_INLINE_VISIBILITY 2033constexpr const _Ep* data(initializer_list<_Ep> __il) noexcept { return __il.begin(); } 2034#endif 2035 2036 2037_LIBCPP_END_NAMESPACE_STD 2038 2039#endif // _LIBCPP_ITERATOR 2040