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 16#include <concepts> 17 18namespace std 19{ 20template<class> struct incrementable_traits; // since C++20 21 22template<class Iterator> 23struct iterator_traits 24{ 25 typedef typename Iterator::difference_type difference_type; 26 typedef typename Iterator::value_type value_type; 27 typedef typename Iterator::pointer pointer; 28 typedef typename Iterator::reference reference; 29 typedef typename Iterator::iterator_category iterator_category; 30}; 31 32template<class T> 33struct iterator_traits<T*> 34{ 35 typedef ptrdiff_t difference_type; 36 typedef T value_type; 37 typedef T* pointer; 38 typedef T& reference; 39 typedef random_access_iterator_tag iterator_category; 40}; 41 42template<class Category, class T, class Distance = ptrdiff_t, 43 class Pointer = T*, class Reference = T&> 44struct iterator 45{ 46 typedef T value_type; 47 typedef Distance difference_type; 48 typedef Pointer pointer; 49 typedef Reference reference; 50 typedef Category iterator_category; 51}; 52 53struct input_iterator_tag {}; 54struct output_iterator_tag {}; 55struct forward_iterator_tag : public input_iterator_tag {}; 56struct bidirectional_iterator_tag : public forward_iterator_tag {}; 57struct random_access_iterator_tag : public bidirectional_iterator_tag {}; 58 59// 27.4.3, iterator operations 60template <class InputIterator, class Distance> // constexpr in C++17 61 constexpr void advance(InputIterator& i, Distance n); 62 63template <class InputIterator> // constexpr in C++17 64 constexpr typename iterator_traits<InputIterator>::difference_type 65 distance(InputIterator first, InputIterator last); 66 67template <class InputIterator> // constexpr in C++17 68 constexpr InputIterator next(InputIterator x, 69typename iterator_traits<InputIterator>::difference_type n = 1); 70 71template <class BidirectionalIterator> // constexpr in C++17 72 constexpr BidirectionalIterator prev(BidirectionalIterator x, 73 typename iterator_traits<BidirectionalIterator>::difference_type n = 1); 74 75template <class Iterator> 76class reverse_iterator 77 : public iterator<typename iterator_traits<Iterator>::iterator_category, 78 typename iterator_traits<Iterator>::value_type, 79 typename iterator_traits<Iterator>::difference_type, 80 typename iterator_traits<Iterator>::pointer, 81 typename iterator_traits<Iterator>::reference> 82{ 83protected: 84 Iterator current; 85public: 86 typedef Iterator iterator_type; 87 typedef typename iterator_traits<Iterator>::difference_type difference_type; 88 typedef typename iterator_traits<Iterator>::reference reference; 89 typedef typename iterator_traits<Iterator>::pointer pointer; 90 91 constexpr reverse_iterator(); 92 constexpr explicit reverse_iterator(Iterator x); 93 template <class U> constexpr reverse_iterator(const reverse_iterator<U>& u); 94 template <class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u); 95 constexpr Iterator base() const; 96 constexpr reference operator*() const; 97 constexpr pointer operator->() const; 98 constexpr reverse_iterator& operator++(); 99 constexpr reverse_iterator operator++(int); 100 constexpr reverse_iterator& operator--(); 101 constexpr reverse_iterator operator--(int); 102 constexpr reverse_iterator operator+ (difference_type n) const; 103 constexpr reverse_iterator& operator+=(difference_type n); 104 constexpr reverse_iterator operator- (difference_type n) const; 105 constexpr reverse_iterator& operator-=(difference_type n); 106 constexpr reference operator[](difference_type n) const; 107}; 108 109template <class Iterator1, class Iterator2> 110constexpr bool // constexpr in C++17 111operator==(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 112 113template <class Iterator1, class Iterator2> 114constexpr bool // constexpr in C++17 115operator<(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 116 117template <class Iterator1, class Iterator2> 118constexpr bool // constexpr in C++17 119operator!=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 120 121template <class Iterator1, class Iterator2> 122constexpr bool // constexpr in C++17 123operator>(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 124 125template <class Iterator1, class Iterator2> 126constexpr bool // constexpr in C++17 127operator>=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 128 129template <class Iterator1, class Iterator2> 130constexpr bool // constexpr in C++17 131operator<=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 132 133template <class Iterator1, class Iterator2> 134constexpr auto 135operator-(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y) 136-> decltype(__y.base() - __x.base()); // constexpr in C++17 137 138template <class Iterator> 139constexpr reverse_iterator<Iterator> 140operator+(typename reverse_iterator<Iterator>::difference_type n, 141 const reverse_iterator<Iterator>& x); // constexpr in C++17 142 143template <class Iterator> 144constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i); // C++14, constexpr in C++17 145 146template <class Container> 147class back_insert_iterator 148{ 149protected: 150 Container* container; 151public: 152 typedef Container container_type; 153 typedef void value_type; 154 typedef void difference_type; 155 typedef void reference; 156 typedef void pointer; 157 158 explicit back_insert_iterator(Container& x); // constexpr in C++20 159 back_insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20 160 back_insert_iterator& operator*(); // constexpr in C++20 161 back_insert_iterator& operator++(); // constexpr in C++20 162 back_insert_iterator operator++(int); // constexpr in C++20 163}; 164 165template <class Container> back_insert_iterator<Container> back_inserter(Container& x); // constexpr in C++20 166 167template <class Container> 168class front_insert_iterator 169{ 170protected: 171 Container* container; 172public: 173 typedef Container container_type; 174 typedef void value_type; 175 typedef void difference_type; 176 typedef void reference; 177 typedef void pointer; 178 179 explicit front_insert_iterator(Container& x); // constexpr in C++20 180 front_insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20 181 front_insert_iterator& operator*(); // constexpr in C++20 182 front_insert_iterator& operator++(); // constexpr in C++20 183 front_insert_iterator operator++(int); // constexpr in C++20 184}; 185 186template <class Container> front_insert_iterator<Container> front_inserter(Container& x); // constexpr in C++20 187 188template <class Container> 189class insert_iterator 190{ 191protected: 192 Container* container; 193 typename Container::iterator iter; 194public: 195 typedef Container container_type; 196 typedef void value_type; 197 typedef void difference_type; 198 typedef void reference; 199 typedef void pointer; 200 201 insert_iterator(Container& x, typename Container::iterator i); // constexpr in C++20 202 insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20 203 insert_iterator& operator*(); // constexpr in C++20 204 insert_iterator& operator++(); // constexpr in C++20 205 insert_iterator& operator++(int); // constexpr in C++20 206}; 207 208template <class Container, class Iterator> 209insert_iterator<Container> inserter(Container& x, Iterator i); // constexpr in C++20 210 211template <class Iterator> 212class move_iterator { 213public: 214 typedef Iterator iterator_type; 215 typedef typename iterator_traits<Iterator>::difference_type difference_type; 216 typedef Iterator pointer; 217 typedef typename iterator_traits<Iterator>::value_type value_type; 218 typedef typename iterator_traits<Iterator>::iterator_category iterator_category; 219 typedef value_type&& reference; 220 221 constexpr move_iterator(); // all the constexprs are in C++17 222 constexpr explicit move_iterator(Iterator i); 223 template <class U> 224 constexpr move_iterator(const move_iterator<U>& u); 225 template <class U> 226 constexpr move_iterator& operator=(const move_iterator<U>& u); 227 constexpr iterator_type base() const; 228 constexpr reference operator*() const; 229 constexpr pointer operator->() const; 230 constexpr move_iterator& operator++(); 231 constexpr move_iterator operator++(int); 232 constexpr move_iterator& operator--(); 233 constexpr move_iterator operator--(int); 234 constexpr move_iterator operator+(difference_type n) const; 235 constexpr move_iterator& operator+=(difference_type n); 236 constexpr move_iterator operator-(difference_type n) const; 237 constexpr move_iterator& operator-=(difference_type n); 238 constexpr unspecified operator[](difference_type n) const; 239private: 240 Iterator current; // exposition only 241}; 242 243template <class Iterator1, class Iterator2> 244constexpr bool // constexpr in C++17 245operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 246 247template <class Iterator1, class Iterator2> 248constexpr bool // constexpr in C++17 249operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 250 251template <class Iterator1, class Iterator2> 252constexpr bool // constexpr in C++17 253operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 254 255template <class Iterator1, class Iterator2> 256constexpr bool // constexpr in C++17 257operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 258 259template <class Iterator1, class Iterator2> 260constexpr bool // constexpr in C++17 261operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 262 263template <class Iterator1, class Iterator2> 264constexpr bool // constexpr in C++17 265operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 266 267template <class Iterator1, class Iterator2> 268constexpr auto // constexpr in C++17 269operator-(const move_iterator<Iterator1>& x, 270 const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base()); 271 272template <class Iterator> 273constexpr move_iterator<Iterator> operator+( // constexpr in C++17 274 typename move_iterator<Iterator>::difference_type n, 275 const move_iterator<Iterator>& x); 276 277template <class Iterator> // constexpr in C++17 278constexpr move_iterator<Iterator> make_move_iterator(const Iterator& i); 279 280 281template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t> 282class istream_iterator 283 : public iterator<input_iterator_tag, T, Distance, const T*, const T&> 284{ 285public: 286 typedef charT char_type; 287 typedef traits traits_type; 288 typedef basic_istream<charT,traits> istream_type; 289 290 constexpr istream_iterator(); 291 istream_iterator(istream_type& s); 292 istream_iterator(const istream_iterator& x); 293 ~istream_iterator(); 294 295 const T& operator*() const; 296 const T* operator->() const; 297 istream_iterator& operator++(); 298 istream_iterator operator++(int); 299}; 300 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); 304template <class T, class charT, class traits, class Distance> 305bool operator!=(const istream_iterator<T,charT,traits,Distance>& x, 306 const istream_iterator<T,charT,traits,Distance>& y); 307 308template <class T, class charT = char, class traits = char_traits<charT> > 309class ostream_iterator 310 : public iterator<output_iterator_tag, void, void, void ,void> 311{ 312public: 313 typedef charT char_type; 314 typedef traits traits_type; 315 typedef basic_ostream<charT,traits> ostream_type; 316 317 ostream_iterator(ostream_type& s); 318 ostream_iterator(ostream_type& s, const charT* delimiter); 319 ostream_iterator(const ostream_iterator& x); 320 ~ostream_iterator(); 321 ostream_iterator& operator=(const T& value); 322 323 ostream_iterator& operator*(); 324 ostream_iterator& operator++(); 325 ostream_iterator& operator++(int); 326}; 327 328template<class charT, class traits = char_traits<charT> > 329class istreambuf_iterator 330 : public iterator<input_iterator_tag, charT, 331 typename traits::off_type, unspecified, 332 charT> 333{ 334public: 335 typedef charT char_type; 336 typedef traits traits_type; 337 typedef typename traits::int_type int_type; 338 typedef basic_streambuf<charT,traits> streambuf_type; 339 typedef basic_istream<charT,traits> istream_type; 340 341 istreambuf_iterator() noexcept; 342 istreambuf_iterator(istream_type& s) noexcept; 343 istreambuf_iterator(streambuf_type* s) noexcept; 344 istreambuf_iterator(a-private-type) noexcept; 345 346 charT operator*() const; 347 pointer operator->() const; 348 istreambuf_iterator& operator++(); 349 a-private-type operator++(int); 350 351 bool equal(const istreambuf_iterator& b) const; 352}; 353 354template <class charT, class traits> 355bool operator==(const istreambuf_iterator<charT,traits>& a, 356 const istreambuf_iterator<charT,traits>& b); 357template <class charT, class traits> 358bool operator!=(const istreambuf_iterator<charT,traits>& a, 359 const istreambuf_iterator<charT,traits>& b); 360 361template <class charT, class traits = char_traits<charT> > 362class ostreambuf_iterator 363 : public iterator<output_iterator_tag, void, void, void, void> 364{ 365public: 366 typedef charT char_type; 367 typedef traits traits_type; 368 typedef basic_streambuf<charT,traits> streambuf_type; 369 typedef basic_ostream<charT,traits> ostream_type; 370 371 ostreambuf_iterator(ostream_type& s) noexcept; 372 ostreambuf_iterator(streambuf_type* s) noexcept; 373 ostreambuf_iterator& operator=(charT c); 374 ostreambuf_iterator& operator*(); 375 ostreambuf_iterator& operator++(); 376 ostreambuf_iterator& operator++(int); 377 bool failed() const noexcept; 378}; 379 380template <class C> constexpr auto begin(C& c) -> decltype(c.begin()); 381template <class C> constexpr auto begin(const C& c) -> decltype(c.begin()); 382template <class C> constexpr auto end(C& c) -> decltype(c.end()); 383template <class C> constexpr auto end(const C& c) -> decltype(c.end()); 384template <class T, size_t N> constexpr T* begin(T (&array)[N]); 385template <class T, size_t N> constexpr T* end(T (&array)[N]); 386 387template <class C> auto constexpr cbegin(const C& c) -> decltype(std::begin(c)); // C++14 388template <class C> auto constexpr cend(const C& c) -> decltype(std::end(c)); // C++14 389template <class C> auto constexpr rbegin(C& c) -> decltype(c.rbegin()); // C++14 390template <class C> auto constexpr rbegin(const C& c) -> decltype(c.rbegin()); // C++14 391template <class C> auto constexpr rend(C& c) -> decltype(c.rend()); // C++14 392template <class C> constexpr auto rend(const C& c) -> decltype(c.rend()); // C++14 393template <class E> reverse_iterator<const E*> constexpr rbegin(initializer_list<E> il); // C++14 394template <class E> reverse_iterator<const E*> constexpr rend(initializer_list<E> il); // C++14 395template <class T, size_t N> reverse_iterator<T*> constexpr rbegin(T (&array)[N]); // C++14 396template <class T, size_t N> reverse_iterator<T*> constexpr rend(T (&array)[N]); // C++14 397template <class C> constexpr auto crbegin(const C& c) -> decltype(std::rbegin(c)); // C++14 398template <class C> constexpr auto crend(const C& c) -> decltype(std::rend(c)); // C++14 399 400// 24.8, container access: 401template <class C> constexpr auto size(const C& c) -> decltype(c.size()); // C++17 402template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17 403 404template <class C> constexpr auto ssize(const C& c) 405 -> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size())>>; // C++20 406template <class T, ptrdiff_t> constexpr ptrdiff_t ssize(const T (&array)[N]) noexcept; // C++20 407 408template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17 409template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17 410template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17 411template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17 412template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17 413template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17 414template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17 415 416} // std 417 418*/ 419 420#include <__config> 421#include <iosfwd> // for forward declarations of vector and string. 422#include <__functional_base> 423#include <type_traits> 424#include <compare> 425#include <concepts> 426#include <cstddef> 427#include <initializer_list> 428#include <__memory/base.h> 429#include <__memory/pointer_traits.h> 430#include <version> 431#include <concepts> 432 433#include <__debug> 434 435#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 436#pragma GCC system_header 437#endif 438 439_LIBCPP_BEGIN_NAMESPACE_STD 440 441#if !defined(_LIBCPP_HAS_NO_RANGES) 442// [incrementable.traits] 443template<class> struct incrementable_traits {}; 444 445template<class _Tp> 446requires is_object_v<_Tp> 447struct incrementable_traits<_Tp*> { 448 using difference_type = ptrdiff_t; 449}; 450 451template<class _Ip> 452struct incrementable_traits<const _Ip> : incrementable_traits<_Ip> {}; 453 454template<class _Tp> 455concept __has_member_difference_type = requires { typename _Tp::difference_type; }; 456 457template<__has_member_difference_type _Tp> 458struct incrementable_traits<_Tp> { 459 using difference_type = typename _Tp::difference_type; 460}; 461 462template<class _Tp> 463concept __has_integral_minus = 464 requires(const _Tp& __x, const _Tp& __y) { 465 { __x - __y } -> integral; 466 }; 467 468template<__has_integral_minus _Tp> 469requires (!__has_member_difference_type<_Tp>) 470struct incrementable_traits<_Tp> { 471 using difference_type = make_signed_t<decltype(declval<_Tp>() - declval<_Tp>())>; 472}; 473 474// TODO(cjdb): add iter_difference_t once iterator_traits is cleaned up. 475#endif // !defined(_LIBCPP_HAS_NO_RANGES) 476 477template <class _Iter> 478struct _LIBCPP_TEMPLATE_VIS iterator_traits; 479 480struct _LIBCPP_TEMPLATE_VIS input_iterator_tag {}; 481struct _LIBCPP_TEMPLATE_VIS output_iterator_tag {}; 482struct _LIBCPP_TEMPLATE_VIS forward_iterator_tag : public input_iterator_tag {}; 483struct _LIBCPP_TEMPLATE_VIS bidirectional_iterator_tag : public forward_iterator_tag {}; 484struct _LIBCPP_TEMPLATE_VIS random_access_iterator_tag : public bidirectional_iterator_tag {}; 485#if _LIBCPP_STD_VER > 17 486struct _LIBCPP_TEMPLATE_VIS contiguous_iterator_tag : public random_access_iterator_tag {}; 487#endif 488 489template <class _Iter> 490struct __iter_traits_cache { 491 using type = _If< 492 __is_primary_template<iterator_traits<_Iter> >::value, 493 _Iter, 494 iterator_traits<_Iter> 495 >; 496}; 497template <class _Iter> 498using _ITER_TRAITS = typename __iter_traits_cache<_Iter>::type; 499 500struct __iter_concept_concept_test { 501 template <class _Iter> 502 using _Apply = typename _ITER_TRAITS<_Iter>::iterator_concept; 503}; 504struct __iter_concept_category_test { 505 template <class _Iter> 506 using _Apply = typename _ITER_TRAITS<_Iter>::iterator_category; 507}; 508struct __iter_concept_random_fallback { 509 template <class _Iter> 510 using _Apply = _EnableIf< 511 __is_primary_template<iterator_traits<_Iter> >::value, 512 random_access_iterator_tag 513 >; 514}; 515 516template <class _Iter, class _Tester> struct __test_iter_concept 517 : _IsValidExpansion<_Tester::template _Apply, _Iter>, 518 _Tester 519{ 520}; 521 522template <class _Iter> 523struct __iter_concept_cache { 524 using type = _Or< 525 __test_iter_concept<_Iter, __iter_concept_concept_test>, 526 __test_iter_concept<_Iter, __iter_concept_category_test>, 527 __test_iter_concept<_Iter, __iter_concept_random_fallback> 528 >; 529}; 530 531template <class _Iter> 532using _ITER_CONCEPT = typename __iter_concept_cache<_Iter>::type::template _Apply<_Iter>; 533 534 535template <class _Tp> 536struct __has_iterator_typedefs 537{ 538private: 539 struct __two {char __lx; char __lxx;}; 540 template <class _Up> static __two __test(...); 541 template <class _Up> static char __test(typename __void_t<typename _Up::iterator_category>::type* = 0, 542 typename __void_t<typename _Up::difference_type>::type* = 0, 543 typename __void_t<typename _Up::value_type>::type* = 0, 544 typename __void_t<typename _Up::reference>::type* = 0, 545 typename __void_t<typename _Up::pointer>::type* = 0); 546public: 547 static const bool value = sizeof(__test<_Tp>(0,0,0,0,0)) == 1; 548}; 549 550 551template <class _Tp> 552struct __has_iterator_category 553{ 554private: 555 struct __two {char __lx; char __lxx;}; 556 template <class _Up> static __two __test(...); 557 template <class _Up> static char __test(typename _Up::iterator_category* = nullptr); 558public: 559 static const bool value = sizeof(__test<_Tp>(nullptr)) == 1; 560}; 561 562template <class _Tp> 563struct __has_iterator_concept 564{ 565private: 566 struct __two {char __lx; char __lxx;}; 567 template <class _Up> static __two __test(...); 568 template <class _Up> static char __test(typename _Up::iterator_concept* = nullptr); 569public: 570 static const bool value = sizeof(__test<_Tp>(nullptr)) == 1; 571}; 572 573template <class _Iter, bool> struct __iterator_traits_impl {}; 574 575template <class _Iter> 576struct __iterator_traits_impl<_Iter, true> 577{ 578 typedef typename _Iter::difference_type difference_type; 579 typedef typename _Iter::value_type value_type; 580 typedef typename _Iter::pointer pointer; 581 typedef typename _Iter::reference reference; 582 typedef typename _Iter::iterator_category iterator_category; 583}; 584 585template <class _Iter, bool> struct __iterator_traits {}; 586 587template <class _Iter> 588struct __iterator_traits<_Iter, true> 589 : __iterator_traits_impl 590 < 591 _Iter, 592 is_convertible<typename _Iter::iterator_category, input_iterator_tag>::value || 593 is_convertible<typename _Iter::iterator_category, output_iterator_tag>::value 594 > 595{}; 596 597// iterator_traits<Iterator> will only have the nested types if Iterator::iterator_category 598// exists. Else iterator_traits<Iterator> will be an empty class. This is a 599// conforming extension which allows some programs to compile and behave as 600// the client expects instead of failing at compile time. 601 602template <class _Iter> 603struct _LIBCPP_TEMPLATE_VIS iterator_traits 604 : __iterator_traits<_Iter, __has_iterator_typedefs<_Iter>::value> { 605 606 using __primary_template = iterator_traits; 607}; 608 609template<class _Tp> 610struct _LIBCPP_TEMPLATE_VIS iterator_traits<_Tp*> 611{ 612 typedef ptrdiff_t difference_type; 613 typedef typename remove_cv<_Tp>::type value_type; 614 typedef _Tp* pointer; 615 typedef _Tp& reference; 616 typedef random_access_iterator_tag iterator_category; 617#if _LIBCPP_STD_VER > 17 618 typedef contiguous_iterator_tag iterator_concept; 619#endif 620}; 621 622template <class _Tp, class _Up, bool = __has_iterator_category<iterator_traits<_Tp> >::value> 623struct __has_iterator_category_convertible_to 624 : _BoolConstant<is_convertible<typename iterator_traits<_Tp>::iterator_category, _Up>::value> 625{}; 626 627template <class _Tp, class _Up> 628struct __has_iterator_category_convertible_to<_Tp, _Up, false> : false_type {}; 629 630template <class _Tp, class _Up, bool = __has_iterator_concept<_Tp>::value> 631struct __has_iterator_concept_convertible_to 632 : _BoolConstant<is_convertible<typename _Tp::iterator_concept, _Up>::value> 633{}; 634 635template <class _Tp, class _Up> 636struct __has_iterator_concept_convertible_to<_Tp, _Up, false> : false_type {}; 637 638template <class _Tp> 639struct __is_cpp17_input_iterator : public __has_iterator_category_convertible_to<_Tp, input_iterator_tag> {}; 640 641template <class _Tp> 642struct __is_cpp17_forward_iterator : public __has_iterator_category_convertible_to<_Tp, forward_iterator_tag> {}; 643 644template <class _Tp> 645struct __is_cpp17_bidirectional_iterator : public __has_iterator_category_convertible_to<_Tp, bidirectional_iterator_tag> {}; 646 647template <class _Tp> 648struct __is_cpp17_random_access_iterator : public __has_iterator_category_convertible_to<_Tp, random_access_iterator_tag> {}; 649 650// __is_cpp17_contiguous_iterator determines if an iterator is contiguous, 651// either because it advertises itself as such (in C++20) or because it 652// is a pointer type or a known trivial wrapper around a pointer type, 653// such as __wrap_iter<T*>. 654// 655#if _LIBCPP_STD_VER > 17 656template <class _Tp> 657struct __is_cpp17_contiguous_iterator : _Or< 658 __has_iterator_category_convertible_to<_Tp, contiguous_iterator_tag>, 659 __has_iterator_concept_convertible_to<_Tp, contiguous_iterator_tag> 660> {}; 661#else 662template <class _Tp> 663struct __is_cpp17_contiguous_iterator : false_type {}; 664#endif 665 666// Any native pointer which is an iterator is also a contiguous iterator. 667template <class _Up> 668struct __is_cpp17_contiguous_iterator<_Up*> : true_type {}; 669 670 671template <class _Tp> 672struct __is_exactly_cpp17_input_iterator 673 : public integral_constant<bool, 674 __has_iterator_category_convertible_to<_Tp, input_iterator_tag>::value && 675 !__has_iterator_category_convertible_to<_Tp, forward_iterator_tag>::value> {}; 676 677#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES 678template<class _InputIterator> 679using __iter_value_type = typename iterator_traits<_InputIterator>::value_type; 680 681template<class _InputIterator> 682using __iter_key_type = remove_const_t<typename iterator_traits<_InputIterator>::value_type::first_type>; 683 684template<class _InputIterator> 685using __iter_mapped_type = typename iterator_traits<_InputIterator>::value_type::second_type; 686 687template<class _InputIterator> 688using __iter_to_alloc_type = pair< 689 add_const_t<typename iterator_traits<_InputIterator>::value_type::first_type>, 690 typename iterator_traits<_InputIterator>::value_type::second_type>; 691#endif 692 693template<class _Category, class _Tp, class _Distance = ptrdiff_t, 694 class _Pointer = _Tp*, class _Reference = _Tp&> 695struct _LIBCPP_TEMPLATE_VIS iterator 696{ 697 typedef _Tp value_type; 698 typedef _Distance difference_type; 699 typedef _Pointer pointer; 700 typedef _Reference reference; 701 typedef _Category iterator_category; 702}; 703 704template <class _InputIter> 705inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 706void __advance(_InputIter& __i, 707 typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag) 708{ 709 for (; __n > 0; --__n) 710 ++__i; 711} 712 713template <class _BiDirIter> 714inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 715void __advance(_BiDirIter& __i, 716 typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag) 717{ 718 if (__n >= 0) 719 for (; __n > 0; --__n) 720 ++__i; 721 else 722 for (; __n < 0; ++__n) 723 --__i; 724} 725 726template <class _RandIter> 727inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 728void __advance(_RandIter& __i, 729 typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag) 730{ 731 __i += __n; 732} 733 734template <class _InputIter, class _Distance> 735inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 736void advance(_InputIter& __i, _Distance __orig_n) 737{ 738 _LIBCPP_ASSERT(__orig_n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 739 "Attempt to advance(it, n) with negative n on a non-bidirectional iterator"); 740 typedef decltype(_VSTD::__convert_to_integral(__orig_n)) _IntegralSize; 741 _IntegralSize __n = __orig_n; 742 _VSTD::__advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category()); 743} 744 745template <class _InputIter> 746inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 747typename iterator_traits<_InputIter>::difference_type 748__distance(_InputIter __first, _InputIter __last, input_iterator_tag) 749{ 750 typename iterator_traits<_InputIter>::difference_type __r(0); 751 for (; __first != __last; ++__first) 752 ++__r; 753 return __r; 754} 755 756template <class _RandIter> 757inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 758typename iterator_traits<_RandIter>::difference_type 759__distance(_RandIter __first, _RandIter __last, random_access_iterator_tag) 760{ 761 return __last - __first; 762} 763 764template <class _InputIter> 765inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 766typename iterator_traits<_InputIter>::difference_type 767distance(_InputIter __first, _InputIter __last) 768{ 769 return _VSTD::__distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category()); 770} 771 772template <class _InputIter> 773inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 774typename enable_if 775< 776 __is_cpp17_input_iterator<_InputIter>::value, 777 _InputIter 778>::type 779next(_InputIter __x, 780 typename iterator_traits<_InputIter>::difference_type __n = 1) 781{ 782 _LIBCPP_ASSERT(__n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 783 "Attempt to next(it, n) with negative n on a non-bidirectional iterator"); 784 785 _VSTD::advance(__x, __n); 786 return __x; 787} 788 789template <class _InputIter> 790inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 791typename enable_if 792< 793 __is_cpp17_input_iterator<_InputIter>::value, 794 _InputIter 795>::type 796prev(_InputIter __x, 797 typename iterator_traits<_InputIter>::difference_type __n = 1) 798{ 799 _LIBCPP_ASSERT(__n <= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 800 "Attempt to prev(it, n) with a positive n on a non-bidirectional iterator"); 801 _VSTD::advance(__x, -__n); 802 return __x; 803} 804 805 806template <class _Tp, class = void> 807struct __is_stashing_iterator : false_type {}; 808 809template <class _Tp> 810struct __is_stashing_iterator<_Tp, typename __void_t<typename _Tp::__stashing_iterator_tag>::type> 811 : true_type {}; 812 813template <class _Iter> 814class _LIBCPP_TEMPLATE_VIS reverse_iterator 815 : public iterator<typename iterator_traits<_Iter>::iterator_category, 816 typename iterator_traits<_Iter>::value_type, 817 typename iterator_traits<_Iter>::difference_type, 818 typename iterator_traits<_Iter>::pointer, 819 typename iterator_traits<_Iter>::reference> 820{ 821private: 822 /*mutable*/ _Iter __t; // no longer used as of LWG #2360, not removed due to ABI break 823 824 static_assert(!__is_stashing_iterator<_Iter>::value, 825 "The specified iterator type cannot be used with reverse_iterator; " 826 "Using stashing iterators with reverse_iterator causes undefined behavior"); 827 828protected: 829 _Iter current; 830public: 831 typedef _Iter iterator_type; 832 typedef typename iterator_traits<_Iter>::difference_type difference_type; 833 typedef typename iterator_traits<_Iter>::reference reference; 834 typedef typename iterator_traits<_Iter>::pointer pointer; 835 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 836 random_access_iterator_tag, 837 typename iterator_traits<_Iter>::iterator_category> iterator_category; 838#if _LIBCPP_STD_VER > 17 839 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 840 random_access_iterator_tag, 841 bidirectional_iterator_tag> iterator_concept; 842#endif 843 844 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 845 reverse_iterator() : __t(), current() {} 846 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 847 explicit reverse_iterator(_Iter __x) : __t(__x), current(__x) {} 848 template <class _Up> 849 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 850 reverse_iterator(const reverse_iterator<_Up>& __u) : __t(__u.base()), current(__u.base()) {} 851 template <class _Up> 852 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 853 reverse_iterator& operator=(const reverse_iterator<_Up>& __u) 854 { __t = current = __u.base(); return *this; } 855 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 856 _Iter base() const {return current;} 857 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 858 reference operator*() const {_Iter __tmp = current; return *--__tmp;} 859 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 860 pointer operator->() const {return _VSTD::addressof(operator*());} 861 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 862 reverse_iterator& operator++() {--current; return *this;} 863 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 864 reverse_iterator operator++(int) {reverse_iterator __tmp(*this); --current; return __tmp;} 865 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 866 reverse_iterator& operator--() {++current; return *this;} 867 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 868 reverse_iterator operator--(int) {reverse_iterator __tmp(*this); ++current; return __tmp;} 869 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 870 reverse_iterator operator+ (difference_type __n) const {return reverse_iterator(current - __n);} 871 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 872 reverse_iterator& operator+=(difference_type __n) {current -= __n; return *this;} 873 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 874 reverse_iterator operator- (difference_type __n) const {return reverse_iterator(current + __n);} 875 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 876 reverse_iterator& operator-=(difference_type __n) {current += __n; return *this;} 877 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 878 reference operator[](difference_type __n) const {return *(*this + __n);} 879}; 880 881template <class _Iter1, class _Iter2> 882inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 883bool 884operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 885{ 886 return __x.base() == __y.base(); 887} 888 889template <class _Iter1, class _Iter2> 890inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 891bool 892operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 893{ 894 return __x.base() > __y.base(); 895} 896 897template <class _Iter1, class _Iter2> 898inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 899bool 900operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 901{ 902 return __x.base() != __y.base(); 903} 904 905template <class _Iter1, class _Iter2> 906inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 907bool 908operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 909{ 910 return __x.base() < __y.base(); 911} 912 913template <class _Iter1, class _Iter2> 914inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 915bool 916operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 917{ 918 return __x.base() <= __y.base(); 919} 920 921template <class _Iter1, class _Iter2> 922inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 923bool 924operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 925{ 926 return __x.base() >= __y.base(); 927} 928 929#ifndef _LIBCPP_CXX03_LANG 930template <class _Iter1, class _Iter2> 931inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 932auto 933operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 934-> decltype(__y.base() - __x.base()) 935{ 936 return __y.base() - __x.base(); 937} 938#else 939template <class _Iter1, class _Iter2> 940inline _LIBCPP_INLINE_VISIBILITY 941typename reverse_iterator<_Iter1>::difference_type 942operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 943{ 944 return __y.base() - __x.base(); 945} 946#endif 947 948template <class _Iter> 949inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 950reverse_iterator<_Iter> 951operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_iterator<_Iter>& __x) 952{ 953 return reverse_iterator<_Iter>(__x.base() - __n); 954} 955 956#if _LIBCPP_STD_VER > 11 957template <class _Iter> 958inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 959reverse_iterator<_Iter> make_reverse_iterator(_Iter __i) 960{ 961 return reverse_iterator<_Iter>(__i); 962} 963#endif 964 965template <class _Container> 966class _LIBCPP_TEMPLATE_VIS back_insert_iterator 967 : public iterator<output_iterator_tag, 968 void, 969 void, 970 void, 971 void> 972{ 973protected: 974 _Container* container; 975public: 976 typedef _Container container_type; 977 978 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 explicit back_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {} 979 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator=(const typename _Container::value_type& __value_) 980 {container->push_back(__value_); return *this;} 981#ifndef _LIBCPP_CXX03_LANG 982 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator=(typename _Container::value_type&& __value_) 983 {container->push_back(_VSTD::move(__value_)); return *this;} 984#endif // _LIBCPP_CXX03_LANG 985 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator*() {return *this;} 986 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator++() {return *this;} 987 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator operator++(int) {return *this;} 988}; 989 990template <class _Container> 991inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 992back_insert_iterator<_Container> 993back_inserter(_Container& __x) 994{ 995 return back_insert_iterator<_Container>(__x); 996} 997 998template <class _Container> 999class _LIBCPP_TEMPLATE_VIS front_insert_iterator 1000 : public iterator<output_iterator_tag, 1001 void, 1002 void, 1003 void, 1004 void> 1005{ 1006protected: 1007 _Container* container; 1008public: 1009 typedef _Container container_type; 1010 1011 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 explicit front_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {} 1012 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator=(const typename _Container::value_type& __value_) 1013 {container->push_front(__value_); return *this;} 1014#ifndef _LIBCPP_CXX03_LANG 1015 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator=(typename _Container::value_type&& __value_) 1016 {container->push_front(_VSTD::move(__value_)); return *this;} 1017#endif // _LIBCPP_CXX03_LANG 1018 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator*() {return *this;} 1019 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator++() {return *this;} 1020 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator operator++(int) {return *this;} 1021}; 1022 1023template <class _Container> 1024inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1025front_insert_iterator<_Container> 1026front_inserter(_Container& __x) 1027{ 1028 return front_insert_iterator<_Container>(__x); 1029} 1030 1031template <class _Container> 1032class _LIBCPP_TEMPLATE_VIS insert_iterator 1033 : public iterator<output_iterator_tag, 1034 void, 1035 void, 1036 void, 1037 void> 1038{ 1039protected: 1040 _Container* container; 1041 typename _Container::iterator iter; 1042public: 1043 typedef _Container container_type; 1044 1045 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator(_Container& __x, typename _Container::iterator __i) 1046 : container(_VSTD::addressof(__x)), iter(__i) {} 1047 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(const typename _Container::value_type& __value_) 1048 {iter = container->insert(iter, __value_); ++iter; return *this;} 1049#ifndef _LIBCPP_CXX03_LANG 1050 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(typename _Container::value_type&& __value_) 1051 {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;} 1052#endif // _LIBCPP_CXX03_LANG 1053 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator*() {return *this;} 1054 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++() {return *this;} 1055 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++(int) {return *this;} 1056}; 1057 1058template <class _Container> 1059inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1060insert_iterator<_Container> 1061inserter(_Container& __x, typename _Container::iterator __i) 1062{ 1063 return insert_iterator<_Container>(__x, __i); 1064} 1065 1066template <class _Tp, class _CharT = char, 1067 class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t> 1068class _LIBCPP_TEMPLATE_VIS istream_iterator 1069 : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&> 1070{ 1071public: 1072 typedef _CharT char_type; 1073 typedef _Traits traits_type; 1074 typedef basic_istream<_CharT,_Traits> istream_type; 1075private: 1076 istream_type* __in_stream_; 1077 _Tp __value_; 1078public: 1079 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {} 1080 _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s)) 1081 { 1082 if (!(*__in_stream_ >> __value_)) 1083 __in_stream_ = nullptr; 1084 } 1085 1086 _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;} 1087 _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));} 1088 _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++() 1089 { 1090 if (!(*__in_stream_ >> __value_)) 1091 __in_stream_ = nullptr; 1092 return *this; 1093 } 1094 _LIBCPP_INLINE_VISIBILITY istream_iterator operator++(int) 1095 {istream_iterator __t(*this); ++(*this); return __t;} 1096 1097 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 1098 friend _LIBCPP_INLINE_VISIBILITY 1099 bool 1100 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 1101 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 1102 1103 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 1104 friend _LIBCPP_INLINE_VISIBILITY 1105 bool 1106 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 1107 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 1108}; 1109 1110template <class _Tp, class _CharT, class _Traits, class _Distance> 1111inline _LIBCPP_INLINE_VISIBILITY 1112bool 1113operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 1114 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 1115{ 1116 return __x.__in_stream_ == __y.__in_stream_; 1117} 1118 1119template <class _Tp, class _CharT, class _Traits, class _Distance> 1120inline _LIBCPP_INLINE_VISIBILITY 1121bool 1122operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 1123 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 1124{ 1125 return !(__x == __y); 1126} 1127 1128template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT> > 1129class _LIBCPP_TEMPLATE_VIS ostream_iterator 1130 : public iterator<output_iterator_tag, void, void, void, void> 1131{ 1132public: 1133 typedef output_iterator_tag iterator_category; 1134 typedef void value_type; 1135#if _LIBCPP_STD_VER > 17 1136 typedef std::ptrdiff_t difference_type; 1137#else 1138 typedef void difference_type; 1139#endif 1140 typedef void pointer; 1141 typedef void reference; 1142 typedef _CharT char_type; 1143 typedef _Traits traits_type; 1144 typedef basic_ostream<_CharT, _Traits> ostream_type; 1145 1146private: 1147 ostream_type* __out_stream_; 1148 const char_type* __delim_; 1149public: 1150 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s) _NOEXCEPT 1151 : __out_stream_(_VSTD::addressof(__s)), __delim_(nullptr) {} 1152 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter) _NOEXCEPT 1153 : __out_stream_(_VSTD::addressof(__s)), __delim_(__delimiter) {} 1154 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator=(const _Tp& __value_) 1155 { 1156 *__out_stream_ << __value_; 1157 if (__delim_) 1158 *__out_stream_ << __delim_; 1159 return *this; 1160 } 1161 1162 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator*() {return *this;} 1163 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++() {return *this;} 1164 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++(int) {return *this;} 1165}; 1166 1167template<class _CharT, class _Traits> 1168class _LIBCPP_TEMPLATE_VIS istreambuf_iterator 1169 : public iterator<input_iterator_tag, _CharT, 1170 typename _Traits::off_type, _CharT*, 1171 _CharT> 1172{ 1173public: 1174 typedef _CharT char_type; 1175 typedef _Traits traits_type; 1176 typedef typename _Traits::int_type int_type; 1177 typedef basic_streambuf<_CharT,_Traits> streambuf_type; 1178 typedef basic_istream<_CharT,_Traits> istream_type; 1179private: 1180 mutable streambuf_type* __sbuf_; 1181 1182 class __proxy 1183 { 1184 char_type __keep_; 1185 streambuf_type* __sbuf_; 1186 _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s) 1187 : __keep_(__c), __sbuf_(__s) {} 1188 friend class istreambuf_iterator; 1189 public: 1190 _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;} 1191 }; 1192 1193 _LIBCPP_INLINE_VISIBILITY 1194 bool __test_for_eof() const 1195 { 1196 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof())) 1197 __sbuf_ = nullptr; 1198 return __sbuf_ == nullptr; 1199 } 1200public: 1201 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {} 1202 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT 1203 : __sbuf_(__s.rdbuf()) {} 1204 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT 1205 : __sbuf_(__s) {} 1206 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT 1207 : __sbuf_(__p.__sbuf_) {} 1208 1209 _LIBCPP_INLINE_VISIBILITY char_type operator*() const 1210 {return static_cast<char_type>(__sbuf_->sgetc());} 1211 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++() 1212 { 1213 __sbuf_->sbumpc(); 1214 return *this; 1215 } 1216 _LIBCPP_INLINE_VISIBILITY __proxy operator++(int) 1217 { 1218 return __proxy(__sbuf_->sbumpc(), __sbuf_); 1219 } 1220 1221 _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const 1222 {return __test_for_eof() == __b.__test_for_eof();} 1223}; 1224 1225template <class _CharT, class _Traits> 1226inline _LIBCPP_INLINE_VISIBILITY 1227bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a, 1228 const istreambuf_iterator<_CharT,_Traits>& __b) 1229 {return __a.equal(__b);} 1230 1231template <class _CharT, class _Traits> 1232inline _LIBCPP_INLINE_VISIBILITY 1233bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a, 1234 const istreambuf_iterator<_CharT,_Traits>& __b) 1235 {return !__a.equal(__b);} 1236 1237template <class _CharT, class _Traits> 1238class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator 1239 : public iterator<output_iterator_tag, void, void, void, void> 1240{ 1241public: 1242 typedef output_iterator_tag iterator_category; 1243 typedef void value_type; 1244#if _LIBCPP_STD_VER > 17 1245 typedef std::ptrdiff_t difference_type; 1246#else 1247 typedef void difference_type; 1248#endif 1249 typedef void pointer; 1250 typedef void reference; 1251 typedef _CharT char_type; 1252 typedef _Traits traits_type; 1253 typedef basic_streambuf<_CharT, _Traits> streambuf_type; 1254 typedef basic_ostream<_CharT, _Traits> ostream_type; 1255 1256private: 1257 streambuf_type* __sbuf_; 1258public: 1259 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) _NOEXCEPT 1260 : __sbuf_(__s.rdbuf()) {} 1261 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT 1262 : __sbuf_(__s) {} 1263 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c) 1264 { 1265 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof())) 1266 __sbuf_ = nullptr; 1267 return *this; 1268 } 1269 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*() {return *this;} 1270 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++() {return *this;} 1271 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;} 1272 _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == nullptr;} 1273 1274 template <class _Ch, class _Tr> 1275 friend 1276 _LIBCPP_HIDDEN 1277 ostreambuf_iterator<_Ch, _Tr> 1278 __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s, 1279 const _Ch* __ob, const _Ch* __op, const _Ch* __oe, 1280 ios_base& __iob, _Ch __fl); 1281}; 1282 1283template <class _Iter> 1284class _LIBCPP_TEMPLATE_VIS move_iterator 1285{ 1286private: 1287 _Iter __i; 1288public: 1289 typedef _Iter iterator_type; 1290 typedef typename iterator_traits<iterator_type>::value_type value_type; 1291 typedef typename iterator_traits<iterator_type>::difference_type difference_type; 1292 typedef iterator_type pointer; 1293 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 1294 random_access_iterator_tag, 1295 typename iterator_traits<_Iter>::iterator_category> iterator_category; 1296#if _LIBCPP_STD_VER > 17 1297 typedef input_iterator_tag iterator_concept; 1298#endif 1299 1300#ifndef _LIBCPP_CXX03_LANG 1301 typedef typename iterator_traits<iterator_type>::reference __reference; 1302 typedef typename conditional< 1303 is_reference<__reference>::value, 1304 typename remove_reference<__reference>::type&&, 1305 __reference 1306 >::type reference; 1307#else 1308 typedef typename iterator_traits<iterator_type>::reference reference; 1309#endif 1310 1311 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1312 move_iterator() : __i() {} 1313 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1314 explicit move_iterator(_Iter __x) : __i(__x) {} 1315 template <class _Up> 1316 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1317 move_iterator(const move_iterator<_Up>& __u) : __i(__u.base()) {} 1318 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 _Iter base() const {return __i;} 1319 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1320 reference operator*() const { return static_cast<reference>(*__i); } 1321 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1322 pointer operator->() const { return __i;} 1323 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1324 move_iterator& operator++() {++__i; return *this;} 1325 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1326 move_iterator operator++(int) {move_iterator __tmp(*this); ++__i; return __tmp;} 1327 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1328 move_iterator& operator--() {--__i; return *this;} 1329 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1330 move_iterator operator--(int) {move_iterator __tmp(*this); --__i; return __tmp;} 1331 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1332 move_iterator operator+ (difference_type __n) const {return move_iterator(__i + __n);} 1333 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1334 move_iterator& operator+=(difference_type __n) {__i += __n; return *this;} 1335 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1336 move_iterator operator- (difference_type __n) const {return move_iterator(__i - __n);} 1337 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1338 move_iterator& operator-=(difference_type __n) {__i -= __n; return *this;} 1339 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1340 reference operator[](difference_type __n) const { return static_cast<reference>(__i[__n]); } 1341}; 1342 1343template <class _Iter1, class _Iter2> 1344inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1345bool 1346operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1347{ 1348 return __x.base() == __y.base(); 1349} 1350 1351template <class _Iter1, class _Iter2> 1352inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1353bool 1354operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1355{ 1356 return __x.base() < __y.base(); 1357} 1358 1359template <class _Iter1, class _Iter2> 1360inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1361bool 1362operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1363{ 1364 return __x.base() != __y.base(); 1365} 1366 1367template <class _Iter1, class _Iter2> 1368inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1369bool 1370operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1371{ 1372 return __x.base() > __y.base(); 1373} 1374 1375template <class _Iter1, class _Iter2> 1376inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1377bool 1378operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1379{ 1380 return __x.base() >= __y.base(); 1381} 1382 1383template <class _Iter1, class _Iter2> 1384inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1385bool 1386operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1387{ 1388 return __x.base() <= __y.base(); 1389} 1390 1391#ifndef _LIBCPP_CXX03_LANG 1392template <class _Iter1, class _Iter2> 1393inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1394auto 1395operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1396-> decltype(__x.base() - __y.base()) 1397{ 1398 return __x.base() - __y.base(); 1399} 1400#else 1401template <class _Iter1, class _Iter2> 1402inline _LIBCPP_INLINE_VISIBILITY 1403typename move_iterator<_Iter1>::difference_type 1404operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1405{ 1406 return __x.base() - __y.base(); 1407} 1408#endif 1409 1410template <class _Iter> 1411inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1412move_iterator<_Iter> 1413operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x) 1414{ 1415 return move_iterator<_Iter>(__x.base() + __n); 1416} 1417 1418template <class _Iter> 1419inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1420move_iterator<_Iter> 1421make_move_iterator(_Iter __i) 1422{ 1423 return move_iterator<_Iter>(__i); 1424} 1425 1426// __wrap_iter 1427 1428template <class _Iter> class __wrap_iter; 1429 1430template <class _Iter1, class _Iter2> 1431_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1432bool 1433operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1434 1435template <class _Iter1, class _Iter2> 1436_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1437bool 1438operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1439 1440template <class _Iter1, class _Iter2> 1441_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1442bool 1443operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1444 1445template <class _Iter1, class _Iter2> 1446_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1447bool 1448operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1449 1450template <class _Iter1, class _Iter2> 1451_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1452bool 1453operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1454 1455template <class _Iter1, class _Iter2> 1456_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1457bool 1458operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1459 1460#ifndef _LIBCPP_CXX03_LANG 1461template <class _Iter1, class _Iter2> 1462_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1463auto 1464operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1465-> decltype(__x.base() - __y.base()); 1466#else 1467template <class _Iter1, class _Iter2> 1468_LIBCPP_INLINE_VISIBILITY 1469typename __wrap_iter<_Iter1>::difference_type 1470operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1471#endif 1472 1473template <class _Iter> 1474_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1475__wrap_iter<_Iter> 1476operator+(typename __wrap_iter<_Iter>::difference_type, __wrap_iter<_Iter>) _NOEXCEPT; 1477 1478template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 copy(_Ip, _Ip, _Op); 1479template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 copy_backward(_B1, _B1, _B2); 1480template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 move(_Ip, _Ip, _Op); 1481template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 move_backward(_B1, _B1, _B2); 1482 1483template <class _Iter> 1484class __wrap_iter 1485{ 1486public: 1487 typedef _Iter iterator_type; 1488 typedef typename iterator_traits<iterator_type>::value_type value_type; 1489 typedef typename iterator_traits<iterator_type>::difference_type difference_type; 1490 typedef typename iterator_traits<iterator_type>::pointer pointer; 1491 typedef typename iterator_traits<iterator_type>::reference reference; 1492 typedef typename iterator_traits<iterator_type>::iterator_category iterator_category; 1493#if _LIBCPP_STD_VER > 17 1494 typedef _If<__is_cpp17_contiguous_iterator<_Iter>::value, 1495 contiguous_iterator_tag, iterator_category> iterator_concept; 1496#endif 1497 1498private: 1499 iterator_type __i; 1500public: 1501 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter() _NOEXCEPT 1502#if _LIBCPP_STD_VER > 11 1503 : __i{} 1504#endif 1505 { 1506#if _LIBCPP_DEBUG_LEVEL == 2 1507 __get_db()->__insert_i(this); 1508#endif 1509 } 1510 template <class _Up> _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1511 __wrap_iter(const __wrap_iter<_Up>& __u, 1512 typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = nullptr) _NOEXCEPT 1513 : __i(__u.base()) 1514 { 1515#if _LIBCPP_DEBUG_LEVEL == 2 1516 __get_db()->__iterator_copy(this, &__u); 1517#endif 1518 } 1519#if _LIBCPP_DEBUG_LEVEL == 2 1520 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1521 __wrap_iter(const __wrap_iter& __x) 1522 : __i(__x.base()) 1523 { 1524 __get_db()->__iterator_copy(this, &__x); 1525 } 1526 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1527 __wrap_iter& operator=(const __wrap_iter& __x) 1528 { 1529 if (this != &__x) 1530 { 1531 __get_db()->__iterator_copy(this, &__x); 1532 __i = __x.__i; 1533 } 1534 return *this; 1535 } 1536 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1537 ~__wrap_iter() 1538 { 1539 __get_db()->__erase_i(this); 1540 } 1541#endif 1542 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator*() const _NOEXCEPT 1543 { 1544#if _LIBCPP_DEBUG_LEVEL == 2 1545 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1546 "Attempted to dereference a non-dereferenceable iterator"); 1547#endif 1548 return *__i; 1549 } 1550 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG pointer operator->() const _NOEXCEPT 1551 { 1552#if _LIBCPP_DEBUG_LEVEL == 2 1553 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1554 "Attempted to dereference a non-dereferenceable iterator"); 1555#endif 1556 return (pointer)_VSTD::addressof(*__i); 1557 } 1558 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator++() _NOEXCEPT 1559 { 1560#if _LIBCPP_DEBUG_LEVEL == 2 1561 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1562 "Attempted to increment non-incrementable iterator"); 1563#endif 1564 ++__i; 1565 return *this; 1566 } 1567 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator++(int) _NOEXCEPT 1568 {__wrap_iter __tmp(*this); ++(*this); return __tmp;} 1569 1570 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator--() _NOEXCEPT 1571 { 1572#if _LIBCPP_DEBUG_LEVEL == 2 1573 _LIBCPP_ASSERT(__get_const_db()->__decrementable(this), 1574 "Attempted to decrement non-decrementable iterator"); 1575#endif 1576 --__i; 1577 return *this; 1578 } 1579 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator--(int) _NOEXCEPT 1580 {__wrap_iter __tmp(*this); --(*this); return __tmp;} 1581 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator+ (difference_type __n) const _NOEXCEPT 1582 {__wrap_iter __w(*this); __w += __n; return __w;} 1583 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator+=(difference_type __n) _NOEXCEPT 1584 { 1585#if _LIBCPP_DEBUG_LEVEL == 2 1586 _LIBCPP_ASSERT(__get_const_db()->__addable(this, __n), 1587 "Attempted to add/subtract iterator outside of valid range"); 1588#endif 1589 __i += __n; 1590 return *this; 1591 } 1592 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator- (difference_type __n) const _NOEXCEPT 1593 {return *this + (-__n);} 1594 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator-=(difference_type __n) _NOEXCEPT 1595 {*this += -__n; return *this;} 1596 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator[](difference_type __n) const _NOEXCEPT 1597 { 1598#if _LIBCPP_DEBUG_LEVEL == 2 1599 _LIBCPP_ASSERT(__get_const_db()->__subscriptable(this, __n), 1600 "Attempted to subscript iterator outside of valid range"); 1601#endif 1602 return __i[__n]; 1603 } 1604 1605 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG iterator_type base() const _NOEXCEPT {return __i;} 1606 1607private: 1608#if _LIBCPP_DEBUG_LEVEL == 2 1609 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(const void* __p, iterator_type __x) : __i(__x) 1610 { 1611 __get_db()->__insert_ic(this, __p); 1612 } 1613#else 1614 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {} 1615#endif 1616 1617 template <class _Up> friend class __wrap_iter; 1618 template <class _CharT, class _Traits, class _Alloc> friend class basic_string; 1619 template <class _Tp, class _Alloc> friend class _LIBCPP_TEMPLATE_VIS vector; 1620 template <class _Tp, size_t> friend class _LIBCPP_TEMPLATE_VIS span; 1621 1622 template <class _Iter1, class _Iter2> 1623 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1624 bool 1625 operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1626 1627 template <class _Iter1, class _Iter2> 1628 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1629 bool 1630 operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1631 1632 template <class _Iter1, class _Iter2> 1633 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1634 bool 1635 operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1636 1637 template <class _Iter1, class _Iter2> 1638 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1639 bool 1640 operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1641 1642 template <class _Iter1, class _Iter2> 1643 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1644 bool 1645 operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1646 1647 template <class _Iter1, class _Iter2> 1648 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1649 bool 1650 operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1651 1652#ifndef _LIBCPP_CXX03_LANG 1653 template <class _Iter1, class _Iter2> 1654 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1655 auto 1656 operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1657 -> decltype(__x.base() - __y.base()); 1658#else 1659 template <class _Iter1, class _Iter2> 1660 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1661 typename __wrap_iter<_Iter1>::difference_type 1662 operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1663#endif 1664 1665 template <class _Iter1> 1666 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1667 __wrap_iter<_Iter1> 1668 operator+(typename __wrap_iter<_Iter1>::difference_type, __wrap_iter<_Iter1>) _NOEXCEPT; 1669 1670 template <class _Ip, class _Op> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _Op copy(_Ip, _Ip, _Op); 1671 template <class _B1, class _B2> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _B2 copy_backward(_B1, _B1, _B2); 1672 template <class _Ip, class _Op> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _Op move(_Ip, _Ip, _Op); 1673 template <class _B1, class _B2> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _B2 move_backward(_B1, _B1, _B2); 1674}; 1675 1676#if _LIBCPP_STD_VER <= 17 1677template <class _It> 1678struct __is_cpp17_contiguous_iterator<__wrap_iter<_It> > : __is_cpp17_contiguous_iterator<_It> {}; 1679#endif 1680 1681template <class _Iter> 1682_LIBCPP_CONSTEXPR 1683_EnableIf<__is_cpp17_contiguous_iterator<_Iter>::value, decltype(_VSTD::__to_address(declval<_Iter>()))> 1684__to_address(__wrap_iter<_Iter> __w) _NOEXCEPT { 1685 return _VSTD::__to_address(__w.base()); 1686} 1687 1688template <class _Iter1, class _Iter2> 1689inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1690bool 1691operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1692{ 1693 return __x.base() == __y.base(); 1694} 1695 1696template <class _Iter1, class _Iter2> 1697inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1698bool 1699operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1700{ 1701#if _LIBCPP_DEBUG_LEVEL == 2 1702 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1703 "Attempted to compare incomparable iterators"); 1704#endif 1705 return __x.base() < __y.base(); 1706} 1707 1708template <class _Iter1, class _Iter2> 1709inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1710bool 1711operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1712{ 1713 return !(__x == __y); 1714} 1715 1716template <class _Iter1, class _Iter2> 1717inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1718bool 1719operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1720{ 1721 return __y < __x; 1722} 1723 1724template <class _Iter1, class _Iter2> 1725inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1726bool 1727operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1728{ 1729 return !(__x < __y); 1730} 1731 1732template <class _Iter1, class _Iter2> 1733inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1734bool 1735operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1736{ 1737 return !(__y < __x); 1738} 1739 1740template <class _Iter1> 1741inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1742bool 1743operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1744{ 1745 return !(__x == __y); 1746} 1747 1748template <class _Iter1> 1749inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1750bool 1751operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1752{ 1753 return __y < __x; 1754} 1755 1756template <class _Iter1> 1757inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1758bool 1759operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1760{ 1761 return !(__x < __y); 1762} 1763 1764template <class _Iter1> 1765inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1766bool 1767operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1768{ 1769 return !(__y < __x); 1770} 1771 1772#ifndef _LIBCPP_CXX03_LANG 1773template <class _Iter1, class _Iter2> 1774inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1775auto 1776operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1777-> decltype(__x.base() - __y.base()) 1778{ 1779#if _LIBCPP_DEBUG_LEVEL == 2 1780 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1781 "Attempted to subtract incompatible iterators"); 1782#endif 1783 return __x.base() - __y.base(); 1784} 1785#else 1786template <class _Iter1, class _Iter2> 1787inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1788typename __wrap_iter<_Iter1>::difference_type 1789operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1790{ 1791#if _LIBCPP_DEBUG_LEVEL == 2 1792 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1793 "Attempted to subtract incompatible iterators"); 1794#endif 1795 return __x.base() - __y.base(); 1796} 1797#endif 1798 1799template <class _Iter> 1800inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1801__wrap_iter<_Iter> 1802operator+(typename __wrap_iter<_Iter>::difference_type __n, 1803 __wrap_iter<_Iter> __x) _NOEXCEPT 1804{ 1805 __x += __n; 1806 return __x; 1807} 1808 1809template <class _Iter> 1810struct __libcpp_is_trivial_iterator 1811 : public _LIBCPP_BOOL_CONSTANT(is_pointer<_Iter>::value) {}; 1812 1813template <class _Iter> 1814struct __libcpp_is_trivial_iterator<move_iterator<_Iter> > 1815 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {}; 1816 1817template <class _Iter> 1818struct __libcpp_is_trivial_iterator<reverse_iterator<_Iter> > 1819 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {}; 1820 1821template <class _Iter> 1822struct __libcpp_is_trivial_iterator<__wrap_iter<_Iter> > 1823 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {}; 1824 1825 1826template <class _Tp, size_t _Np> 1827_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1828_Tp* 1829begin(_Tp (&__array)[_Np]) 1830{ 1831 return __array; 1832} 1833 1834template <class _Tp, size_t _Np> 1835_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1836_Tp* 1837end(_Tp (&__array)[_Np]) 1838{ 1839 return __array + _Np; 1840} 1841 1842#if !defined(_LIBCPP_CXX03_LANG) 1843 1844template <class _Cp> 1845_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1846auto 1847begin(_Cp& __c) -> decltype(__c.begin()) 1848{ 1849 return __c.begin(); 1850} 1851 1852template <class _Cp> 1853_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1854auto 1855begin(const _Cp& __c) -> decltype(__c.begin()) 1856{ 1857 return __c.begin(); 1858} 1859 1860template <class _Cp> 1861_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1862auto 1863end(_Cp& __c) -> decltype(__c.end()) 1864{ 1865 return __c.end(); 1866} 1867 1868template <class _Cp> 1869_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1870auto 1871end(const _Cp& __c) -> decltype(__c.end()) 1872{ 1873 return __c.end(); 1874} 1875 1876#if _LIBCPP_STD_VER > 11 1877 1878template <class _Tp, size_t _Np> 1879_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1880reverse_iterator<_Tp*> rbegin(_Tp (&__array)[_Np]) 1881{ 1882 return reverse_iterator<_Tp*>(__array + _Np); 1883} 1884 1885template <class _Tp, size_t _Np> 1886_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1887reverse_iterator<_Tp*> rend(_Tp (&__array)[_Np]) 1888{ 1889 return reverse_iterator<_Tp*>(__array); 1890} 1891 1892template <class _Ep> 1893_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1894reverse_iterator<const _Ep*> rbegin(initializer_list<_Ep> __il) 1895{ 1896 return reverse_iterator<const _Ep*>(__il.end()); 1897} 1898 1899template <class _Ep> 1900_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1901reverse_iterator<const _Ep*> rend(initializer_list<_Ep> __il) 1902{ 1903 return reverse_iterator<const _Ep*>(__il.begin()); 1904} 1905 1906template <class _Cp> 1907_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1908auto cbegin(const _Cp& __c) -> decltype(_VSTD::begin(__c)) 1909{ 1910 return _VSTD::begin(__c); 1911} 1912 1913template <class _Cp> 1914_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1915auto cend(const _Cp& __c) -> decltype(_VSTD::end(__c)) 1916{ 1917 return _VSTD::end(__c); 1918} 1919 1920template <class _Cp> 1921_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1922auto rbegin(_Cp& __c) -> decltype(__c.rbegin()) 1923{ 1924 return __c.rbegin(); 1925} 1926 1927template <class _Cp> 1928_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1929auto rbegin(const _Cp& __c) -> decltype(__c.rbegin()) 1930{ 1931 return __c.rbegin(); 1932} 1933 1934template <class _Cp> 1935_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1936auto rend(_Cp& __c) -> decltype(__c.rend()) 1937{ 1938 return __c.rend(); 1939} 1940 1941template <class _Cp> 1942_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1943auto rend(const _Cp& __c) -> decltype(__c.rend()) 1944{ 1945 return __c.rend(); 1946} 1947 1948template <class _Cp> 1949_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1950auto crbegin(const _Cp& __c) -> decltype(_VSTD::rbegin(__c)) 1951{ 1952 return _VSTD::rbegin(__c); 1953} 1954 1955template <class _Cp> 1956_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1957auto crend(const _Cp& __c) -> decltype(_VSTD::rend(__c)) 1958{ 1959 return _VSTD::rend(__c); 1960} 1961 1962#endif 1963 1964 1965#else // defined(_LIBCPP_CXX03_LANG) 1966 1967template <class _Cp> 1968_LIBCPP_INLINE_VISIBILITY 1969typename _Cp::iterator 1970begin(_Cp& __c) 1971{ 1972 return __c.begin(); 1973} 1974 1975template <class _Cp> 1976_LIBCPP_INLINE_VISIBILITY 1977typename _Cp::const_iterator 1978begin(const _Cp& __c) 1979{ 1980 return __c.begin(); 1981} 1982 1983template <class _Cp> 1984_LIBCPP_INLINE_VISIBILITY 1985typename _Cp::iterator 1986end(_Cp& __c) 1987{ 1988 return __c.end(); 1989} 1990 1991template <class _Cp> 1992_LIBCPP_INLINE_VISIBILITY 1993typename _Cp::const_iterator 1994end(const _Cp& __c) 1995{ 1996 return __c.end(); 1997} 1998 1999#endif // !defined(_LIBCPP_CXX03_LANG) 2000 2001#if _LIBCPP_STD_VER > 14 2002 2003// #if _LIBCPP_STD_VER > 11 2004// template <> 2005// struct _LIBCPP_TEMPLATE_VIS plus<void> 2006// { 2007// template <class _T1, class _T2> 2008// _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 2009// auto operator()(_T1&& __t, _T2&& __u) const 2010// _NOEXCEPT_(noexcept(_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u))) 2011// -> decltype (_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u)) 2012// { return _VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u); } 2013// typedef void is_transparent; 2014// }; 2015// #endif 2016 2017template <class _Cont> 2018_LIBCPP_INLINE_VISIBILITY 2019constexpr auto size(const _Cont& __c) 2020_NOEXCEPT_(noexcept(__c.size())) 2021-> decltype (__c.size()) 2022{ return __c.size(); } 2023 2024template <class _Tp, size_t _Sz> 2025_LIBCPP_INLINE_VISIBILITY 2026constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; } 2027 2028#if _LIBCPP_STD_VER > 17 2029template <class _Cont> 2030_LIBCPP_INLINE_VISIBILITY 2031constexpr auto ssize(const _Cont& __c) 2032_NOEXCEPT_(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()))) 2033-> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>> 2034{ return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); } 2035 2036template <class _Tp, ptrdiff_t _Sz> 2037_LIBCPP_INLINE_VISIBILITY 2038constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { return _Sz; } 2039#endif 2040 2041template <class _Cont> 2042_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 2043constexpr auto empty(const _Cont& __c) 2044_NOEXCEPT_(noexcept(__c.empty())) 2045-> decltype (__c.empty()) 2046{ return __c.empty(); } 2047 2048template <class _Tp, size_t _Sz> 2049_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 2050constexpr bool empty(const _Tp (&)[_Sz]) noexcept { return false; } 2051 2052template <class _Ep> 2053_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 2054constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; } 2055 2056template <class _Cont> constexpr 2057_LIBCPP_INLINE_VISIBILITY 2058auto data(_Cont& __c) 2059_NOEXCEPT_(noexcept(__c.data())) 2060-> decltype (__c.data()) 2061{ return __c.data(); } 2062 2063template <class _Cont> constexpr 2064_LIBCPP_INLINE_VISIBILITY 2065auto data(const _Cont& __c) 2066_NOEXCEPT_(noexcept(__c.data())) 2067-> decltype (__c.data()) 2068{ return __c.data(); } 2069 2070template <class _Tp, size_t _Sz> 2071_LIBCPP_INLINE_VISIBILITY 2072constexpr _Tp* data(_Tp (&__array)[_Sz]) noexcept { return __array; } 2073 2074template <class _Ep> 2075_LIBCPP_INLINE_VISIBILITY 2076constexpr const _Ep* data(initializer_list<_Ep> __il) noexcept { return __il.begin(); } 2077#endif 2078 2079template <class _Container, class _Predicate> 2080typename _Container::size_type 2081__libcpp_erase_if_container(_Container& __c, _Predicate& __pred) { 2082 typename _Container::size_type __old_size = __c.size(); 2083 2084 const typename _Container::iterator __last = __c.end(); 2085 for (typename _Container::iterator __iter = __c.begin(); __iter != __last;) { 2086 if (__pred(*__iter)) 2087 __iter = __c.erase(__iter); 2088 else 2089 ++__iter; 2090 } 2091 2092 return __old_size - __c.size(); 2093} 2094 2095_LIBCPP_END_NAMESPACE_STD 2096 2097#endif // _LIBCPP_ITERATOR 2098