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 21template<class T> 22 using iter_difference_t = see below; // since C++20 23 24template<class> struct indirectly_readable_traits; // since C++20 25template<class T> 26 using iter_value_t = see below; // since C++20 27 28template<class Iterator> 29struct iterator_traits; 30 31template<class T> 32 requires is_object_v<T> // since C++20 33struct iterator_traits<T*>; 34 35template<dereferenceable T> 36 using iter_reference_t = decltype(*declval<T&>()); 37 38namespace ranges::inline unspecified { 39 inline constexpr unspecified iter_move = unspecified; // since C++20, nodiscard as an extension 40}} 41 42template<dereferenceable T> 43 requires ... 44using iter_rvalue_reference_t = decltype(ranges::iter_move(declval<T&>())); // since C++20 45 46// [iterator.concepts], iterator concepts 47// [iterator.concept.readable], concept indirectly_readable 48template<class In> 49 concept indirectly_readable = see below; // since C++20 50 51// [iterator.concept.writable], concept indirectly_writable 52template<class Out, class T> 53 concept indirectly_writable = see below; // since C++20 54 55// [iterator.concept.winc], concept weakly_incrementable 56template<class I> 57 concept weakly_incrementable = see below; // since C++20 58 59// [iterator.concept.inc], concept incrementable 60template<class I> 61 concept incrementable = see below; // since C++20 62 63// [iterator.concept.iterator], concept input_or_output_iterator 64 template<class I> 65 concept input_or_output_iterator = see below; // since C++20 66 67// [iterator.concept.sentinel], concept sentinel_for 68template<class S, class I> 69 concept sentinel_for = see below; // since C++20 70 71// [iterator.concept.sizedsentinel], concept sized_sentinel_for 72template<class S, class I> 73 inline constexpr bool disable_sized_sentinel_for = false; 74 75template<class S, class I> 76 concept sized_sentinel_for = see below; 77 78// [iterator.concept.input], concept input_iterator 79template<class I> 80 concept input_iterator = see below; // since C++20 81 82// [iterator.concept.forward], concept forward_iterator 83template<class I> 84 concept forward_iterator = see below; // since C++20 85 86// [iterator.concept.bidir], concept bidirectional_iterator 87template<class I> 88 concept bidirectional_iterator = see below; // since C++20 89 90// [iterator.concept.random.access], concept random_access_iterator 91template<class I> 92 concept random_access_iterator = see below; // since C++20 93 94template<class Category, class T, class Distance = ptrdiff_t, 95 class Pointer = T*, class Reference = T&> 96struct iterator 97{ 98 typedef T value_type; 99 typedef Distance difference_type; 100 typedef Pointer pointer; 101 typedef Reference reference; 102 typedef Category iterator_category; 103}; 104 105struct input_iterator_tag {}; 106struct output_iterator_tag {}; 107struct forward_iterator_tag : public input_iterator_tag {}; 108struct bidirectional_iterator_tag : public forward_iterator_tag {}; 109struct random_access_iterator_tag : public bidirectional_iterator_tag {}; 110 111// 27.4.3, iterator operations 112template <class InputIterator, class Distance> // constexpr in C++17 113 constexpr void advance(InputIterator& i, Distance n); 114 115template <class InputIterator> // constexpr in C++17 116 constexpr typename iterator_traits<InputIterator>::difference_type 117 distance(InputIterator first, InputIterator last); 118 119template <class InputIterator> // constexpr in C++17 120 constexpr InputIterator next(InputIterator x, 121typename iterator_traits<InputIterator>::difference_type n = 1); 122 123template <class BidirectionalIterator> // constexpr in C++17 124 constexpr BidirectionalIterator prev(BidirectionalIterator x, 125 typename iterator_traits<BidirectionalIterator>::difference_type n = 1); 126 127// [range.iter.ops], range iterator operations 128namespace ranges { 129 // [range.iter.op.advance], ranges::advance 130 template<input_or_output_iterator I> 131 constexpr void advance(I& i, iter_difference_t<I> n); // since C++20 132 template<input_or_output_iterator I, sentinel_for<I> S> 133 constexpr void advance(I& i, S bound); // since C++20 134 template<input_or_output_iterator I, sentinel_for<I> S> 135 constexpr iter_difference_t<I> advance(I& i, iter_difference_t<I> n, S bound); // since C++20 136} 137 138template <class Iterator> 139class reverse_iterator 140 : public iterator<typename iterator_traits<Iterator>::iterator_category, 141 typename iterator_traits<Iterator>::value_type, 142 typename iterator_traits<Iterator>::difference_type, 143 typename iterator_traits<Iterator>::pointer, 144 typename iterator_traits<Iterator>::reference> 145{ 146protected: 147 Iterator current; 148public: 149 typedef Iterator iterator_type; 150 typedef typename iterator_traits<Iterator>::difference_type difference_type; 151 typedef typename iterator_traits<Iterator>::reference reference; 152 typedef typename iterator_traits<Iterator>::pointer pointer; 153 154 constexpr reverse_iterator(); 155 constexpr explicit reverse_iterator(Iterator x); 156 template <class U> constexpr reverse_iterator(const reverse_iterator<U>& u); 157 template <class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u); 158 constexpr Iterator base() const; 159 constexpr reference operator*() const; 160 constexpr pointer operator->() const; 161 constexpr reverse_iterator& operator++(); 162 constexpr reverse_iterator operator++(int); 163 constexpr reverse_iterator& operator--(); 164 constexpr reverse_iterator operator--(int); 165 constexpr reverse_iterator operator+ (difference_type n) const; 166 constexpr reverse_iterator& operator+=(difference_type n); 167 constexpr reverse_iterator operator- (difference_type n) const; 168 constexpr reverse_iterator& operator-=(difference_type n); 169 constexpr reference operator[](difference_type n) const; 170}; 171 172template <class Iterator1, class Iterator2> 173constexpr bool // constexpr in C++17 174operator==(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 175 176template <class Iterator1, class Iterator2> 177constexpr bool // constexpr in C++17 178operator<(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 179 180template <class Iterator1, class Iterator2> 181constexpr bool // constexpr in C++17 182operator!=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 183 184template <class Iterator1, class Iterator2> 185constexpr bool // constexpr in C++17 186operator>(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 187 188template <class Iterator1, class Iterator2> 189constexpr bool // constexpr in C++17 190operator>=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 191 192template <class Iterator1, class Iterator2> 193constexpr bool // constexpr in C++17 194operator<=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 195 196template <class Iterator1, class Iterator2> 197constexpr auto 198operator-(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y) 199-> decltype(__y.base() - __x.base()); // constexpr in C++17 200 201template <class Iterator> 202constexpr reverse_iterator<Iterator> 203operator+(typename reverse_iterator<Iterator>::difference_type n, 204 const reverse_iterator<Iterator>& x); // constexpr in C++17 205 206template <class Iterator> 207constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i); // C++14, constexpr in C++17 208 209template <class Container> 210class back_insert_iterator 211{ 212protected: 213 Container* container; 214public: 215 typedef Container container_type; 216 typedef void value_type; 217 typedef void difference_type; 218 typedef void reference; 219 typedef void pointer; 220 221 explicit back_insert_iterator(Container& x); // constexpr in C++20 222 back_insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20 223 back_insert_iterator& operator*(); // constexpr in C++20 224 back_insert_iterator& operator++(); // constexpr in C++20 225 back_insert_iterator operator++(int); // constexpr in C++20 226}; 227 228template <class Container> back_insert_iterator<Container> back_inserter(Container& x); // constexpr in C++20 229 230template <class Container> 231class front_insert_iterator 232{ 233protected: 234 Container* container; 235public: 236 typedef Container container_type; 237 typedef void value_type; 238 typedef void difference_type; 239 typedef void reference; 240 typedef void pointer; 241 242 explicit front_insert_iterator(Container& x); // constexpr in C++20 243 front_insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20 244 front_insert_iterator& operator*(); // constexpr in C++20 245 front_insert_iterator& operator++(); // constexpr in C++20 246 front_insert_iterator operator++(int); // constexpr in C++20 247}; 248 249template <class Container> front_insert_iterator<Container> front_inserter(Container& x); // constexpr in C++20 250 251template <class Container> 252class insert_iterator 253{ 254protected: 255 Container* container; 256 typename Container::iterator iter; 257public: 258 typedef Container container_type; 259 typedef void value_type; 260 typedef void difference_type; 261 typedef void reference; 262 typedef void pointer; 263 264 insert_iterator(Container& x, typename Container::iterator i); // constexpr in C++20 265 insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20 266 insert_iterator& operator*(); // constexpr in C++20 267 insert_iterator& operator++(); // constexpr in C++20 268 insert_iterator& operator++(int); // constexpr in C++20 269}; 270 271template <class Container, class Iterator> 272insert_iterator<Container> inserter(Container& x, Iterator i); // constexpr in C++20 273 274template <class Iterator> 275class move_iterator { 276public: 277 typedef Iterator iterator_type; 278 typedef typename iterator_traits<Iterator>::difference_type difference_type; 279 typedef Iterator pointer; 280 typedef typename iterator_traits<Iterator>::value_type value_type; 281 typedef typename iterator_traits<Iterator>::iterator_category iterator_category; 282 typedef value_type&& reference; 283 284 constexpr move_iterator(); // all the constexprs are in C++17 285 constexpr explicit move_iterator(Iterator i); 286 template <class U> 287 constexpr move_iterator(const move_iterator<U>& u); 288 template <class U> 289 constexpr move_iterator& operator=(const move_iterator<U>& u); 290 constexpr iterator_type base() const; 291 constexpr reference operator*() const; 292 constexpr pointer operator->() const; 293 constexpr move_iterator& operator++(); 294 constexpr move_iterator operator++(int); 295 constexpr move_iterator& operator--(); 296 constexpr move_iterator operator--(int); 297 constexpr move_iterator operator+(difference_type n) const; 298 constexpr move_iterator& operator+=(difference_type n); 299 constexpr move_iterator operator-(difference_type n) const; 300 constexpr move_iterator& operator-=(difference_type n); 301 constexpr unspecified operator[](difference_type n) const; 302private: 303 Iterator current; // exposition only 304}; 305 306template <class Iterator1, class Iterator2> 307constexpr bool // constexpr in C++17 308operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 309 310template <class Iterator1, class Iterator2> 311constexpr bool // constexpr in C++17 312operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 313 314template <class Iterator1, class Iterator2> 315constexpr bool // constexpr in C++17 316operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 317 318template <class Iterator1, class Iterator2> 319constexpr bool // constexpr in C++17 320operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 321 322template <class Iterator1, class Iterator2> 323constexpr bool // constexpr in C++17 324operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 325 326template <class Iterator1, class Iterator2> 327constexpr bool // constexpr in C++17 328operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 329 330template <class Iterator1, class Iterator2> 331constexpr auto // constexpr in C++17 332operator-(const move_iterator<Iterator1>& x, 333 const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base()); 334 335template <class Iterator> 336constexpr move_iterator<Iterator> operator+( // constexpr in C++17 337 typename move_iterator<Iterator>::difference_type n, 338 const move_iterator<Iterator>& x); 339 340template <class Iterator> // constexpr in C++17 341constexpr move_iterator<Iterator> make_move_iterator(const Iterator& i); 342 343 344template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t> 345class istream_iterator 346 : public iterator<input_iterator_tag, T, Distance, const T*, const T&> 347{ 348public: 349 typedef charT char_type; 350 typedef traits traits_type; 351 typedef basic_istream<charT,traits> istream_type; 352 353 constexpr istream_iterator(); 354 istream_iterator(istream_type& s); 355 istream_iterator(const istream_iterator& x); 356 ~istream_iterator(); 357 358 const T& operator*() const; 359 const T* operator->() const; 360 istream_iterator& operator++(); 361 istream_iterator operator++(int); 362}; 363 364template <class T, class charT, class traits, class Distance> 365bool operator==(const istream_iterator<T,charT,traits,Distance>& x, 366 const istream_iterator<T,charT,traits,Distance>& y); 367template <class T, class charT, class traits, class Distance> 368bool operator!=(const istream_iterator<T,charT,traits,Distance>& x, 369 const istream_iterator<T,charT,traits,Distance>& y); 370 371template <class T, class charT = char, class traits = char_traits<charT> > 372class ostream_iterator 373 : public iterator<output_iterator_tag, void, void, void ,void> 374{ 375public: 376 typedef charT char_type; 377 typedef traits traits_type; 378 typedef basic_ostream<charT,traits> ostream_type; 379 380 ostream_iterator(ostream_type& s); 381 ostream_iterator(ostream_type& s, const charT* delimiter); 382 ostream_iterator(const ostream_iterator& x); 383 ~ostream_iterator(); 384 ostream_iterator& operator=(const T& value); 385 386 ostream_iterator& operator*(); 387 ostream_iterator& operator++(); 388 ostream_iterator& operator++(int); 389}; 390 391template<class charT, class traits = char_traits<charT> > 392class istreambuf_iterator 393 : public iterator<input_iterator_tag, charT, 394 typename traits::off_type, unspecified, 395 charT> 396{ 397public: 398 typedef charT char_type; 399 typedef traits traits_type; 400 typedef typename traits::int_type int_type; 401 typedef basic_streambuf<charT,traits> streambuf_type; 402 typedef basic_istream<charT,traits> istream_type; 403 404 istreambuf_iterator() noexcept; 405 istreambuf_iterator(istream_type& s) noexcept; 406 istreambuf_iterator(streambuf_type* s) noexcept; 407 istreambuf_iterator(a-private-type) noexcept; 408 409 charT operator*() const; 410 pointer operator->() const; 411 istreambuf_iterator& operator++(); 412 a-private-type operator++(int); 413 414 bool equal(const istreambuf_iterator& b) const; 415}; 416 417template <class charT, class traits> 418bool operator==(const istreambuf_iterator<charT,traits>& a, 419 const istreambuf_iterator<charT,traits>& b); 420template <class charT, class traits> 421bool operator!=(const istreambuf_iterator<charT,traits>& a, 422 const istreambuf_iterator<charT,traits>& b); 423 424template <class charT, class traits = char_traits<charT> > 425class ostreambuf_iterator 426 : public iterator<output_iterator_tag, void, void, void, void> 427{ 428public: 429 typedef charT char_type; 430 typedef traits traits_type; 431 typedef basic_streambuf<charT,traits> streambuf_type; 432 typedef basic_ostream<charT,traits> ostream_type; 433 434 ostreambuf_iterator(ostream_type& s) noexcept; 435 ostreambuf_iterator(streambuf_type* s) noexcept; 436 ostreambuf_iterator& operator=(charT c); 437 ostreambuf_iterator& operator*(); 438 ostreambuf_iterator& operator++(); 439 ostreambuf_iterator& operator++(int); 440 bool failed() const noexcept; 441}; 442 443template <class C> constexpr auto begin(C& c) -> decltype(c.begin()); 444template <class C> constexpr auto begin(const C& c) -> decltype(c.begin()); 445template <class C> constexpr auto end(C& c) -> decltype(c.end()); 446template <class C> constexpr auto end(const C& c) -> decltype(c.end()); 447template <class T, size_t N> constexpr T* begin(T (&array)[N]); 448template <class T, size_t N> constexpr T* end(T (&array)[N]); 449 450template <class C> auto constexpr cbegin(const C& c) -> decltype(std::begin(c)); // C++14 451template <class C> auto constexpr cend(const C& c) -> decltype(std::end(c)); // C++14 452template <class C> auto constexpr rbegin(C& c) -> decltype(c.rbegin()); // C++14 453template <class C> auto constexpr rbegin(const C& c) -> decltype(c.rbegin()); // C++14 454template <class C> auto constexpr rend(C& c) -> decltype(c.rend()); // C++14 455template <class C> constexpr auto rend(const C& c) -> decltype(c.rend()); // C++14 456template <class E> reverse_iterator<const E*> constexpr rbegin(initializer_list<E> il); // C++14 457template <class E> reverse_iterator<const E*> constexpr rend(initializer_list<E> il); // C++14 458template <class T, size_t N> reverse_iterator<T*> constexpr rbegin(T (&array)[N]); // C++14 459template <class T, size_t N> reverse_iterator<T*> constexpr rend(T (&array)[N]); // C++14 460template <class C> constexpr auto crbegin(const C& c) -> decltype(std::rbegin(c)); // C++14 461template <class C> constexpr auto crend(const C& c) -> decltype(std::rend(c)); // C++14 462 463// 24.8, container access: 464template <class C> constexpr auto size(const C& c) -> decltype(c.size()); // C++17 465template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17 466 467template <class C> constexpr auto ssize(const C& c) 468 -> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size())>>; // C++20 469template <class T, ptrdiff_t> constexpr ptrdiff_t ssize(const T (&array)[N]) noexcept; // C++20 470 471template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17 472template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17 473template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17 474template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17 475template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17 476template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17 477template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17 478 479} // std 480 481*/ 482 483#include <__config> 484#include <__debug> 485#include <__functional_base> 486#include <__iterator/advance.h> 487#include <__iterator/concepts.h> 488#include <__iterator/incrementable_traits.h> 489#include <__iterator/iter_move.h> 490#include <__iterator/iterator_traits.h> 491#include <__iterator/readable_traits.h> 492#include <__memory/addressof.h> 493#include <__memory/pointer_traits.h> 494#include <compare> 495#include <concepts> // Mandated by the Standard. 496#include <cstddef> 497#include <initializer_list> 498#include <iosfwd> // for forward declarations of vector and string 499#include <type_traits> 500#include <version> 501 502#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 503#pragma GCC system_header 504#endif 505 506_LIBCPP_BEGIN_NAMESPACE_STD 507 508template<class _Category, class _Tp, class _Distance = ptrdiff_t, 509 class _Pointer = _Tp*, class _Reference = _Tp&> 510struct _LIBCPP_TEMPLATE_VIS iterator 511{ 512 typedef _Tp value_type; 513 typedef _Distance difference_type; 514 typedef _Pointer pointer; 515 typedef _Reference reference; 516 typedef _Category iterator_category; 517}; 518 519template <class _InputIter> 520inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 521void __advance(_InputIter& __i, 522 typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag) 523{ 524 for (; __n > 0; --__n) 525 ++__i; 526} 527 528template <class _BiDirIter> 529inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 530void __advance(_BiDirIter& __i, 531 typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag) 532{ 533 if (__n >= 0) 534 for (; __n > 0; --__n) 535 ++__i; 536 else 537 for (; __n < 0; ++__n) 538 --__i; 539} 540 541template <class _RandIter> 542inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 543void __advance(_RandIter& __i, 544 typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag) 545{ 546 __i += __n; 547} 548 549template <class _InputIter, class _Distance, 550 class = typename enable_if<is_integral<decltype(_VSTD::__convert_to_integral(declval<_Distance>()))>::value>::type> 551inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 552void advance(_InputIter& __i, _Distance __orig_n) 553{ 554 typedef decltype(_VSTD::__convert_to_integral(__orig_n)) _IntegralSize; 555 _IntegralSize __n = __orig_n; 556 _LIBCPP_ASSERT(__n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 557 "Attempt to advance(it, n) with negative n on a non-bidirectional iterator"); 558 _VSTD::__advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category()); 559} 560 561template <class _InputIter> 562inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 563typename iterator_traits<_InputIter>::difference_type 564__distance(_InputIter __first, _InputIter __last, input_iterator_tag) 565{ 566 typename iterator_traits<_InputIter>::difference_type __r(0); 567 for (; __first != __last; ++__first) 568 ++__r; 569 return __r; 570} 571 572template <class _RandIter> 573inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 574typename iterator_traits<_RandIter>::difference_type 575__distance(_RandIter __first, _RandIter __last, random_access_iterator_tag) 576{ 577 return __last - __first; 578} 579 580template <class _InputIter> 581inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 582typename iterator_traits<_InputIter>::difference_type 583distance(_InputIter __first, _InputIter __last) 584{ 585 return _VSTD::__distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category()); 586} 587 588template <class _InputIter> 589inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 590typename enable_if 591< 592 __is_cpp17_input_iterator<_InputIter>::value, 593 _InputIter 594>::type 595next(_InputIter __x, 596 typename iterator_traits<_InputIter>::difference_type __n = 1) 597{ 598 _LIBCPP_ASSERT(__n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 599 "Attempt to next(it, n) with negative n on a non-bidirectional iterator"); 600 601 _VSTD::advance(__x, __n); 602 return __x; 603} 604 605template <class _InputIter> 606inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 607typename enable_if 608< 609 __is_cpp17_input_iterator<_InputIter>::value, 610 _InputIter 611>::type 612prev(_InputIter __x, 613 typename iterator_traits<_InputIter>::difference_type __n = 1) 614{ 615 _LIBCPP_ASSERT(__n <= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 616 "Attempt to prev(it, n) with a positive n on a non-bidirectional iterator"); 617 _VSTD::advance(__x, -__n); 618 return __x; 619} 620 621 622template <class _Tp, class = void> 623struct __is_stashing_iterator : false_type {}; 624 625template <class _Tp> 626struct __is_stashing_iterator<_Tp, typename __void_t<typename _Tp::__stashing_iterator_tag>::type> 627 : true_type {}; 628 629template <class _Iter> 630class _LIBCPP_TEMPLATE_VIS reverse_iterator 631 : public iterator<typename iterator_traits<_Iter>::iterator_category, 632 typename iterator_traits<_Iter>::value_type, 633 typename iterator_traits<_Iter>::difference_type, 634 typename iterator_traits<_Iter>::pointer, 635 typename iterator_traits<_Iter>::reference> 636{ 637private: 638 /*mutable*/ _Iter __t; // no longer used as of LWG #2360, not removed due to ABI break 639 640 static_assert(!__is_stashing_iterator<_Iter>::value, 641 "The specified iterator type cannot be used with reverse_iterator; " 642 "Using stashing iterators with reverse_iterator causes undefined behavior"); 643 644protected: 645 _Iter current; 646public: 647 typedef _Iter iterator_type; 648 typedef typename iterator_traits<_Iter>::difference_type difference_type; 649 typedef typename iterator_traits<_Iter>::reference reference; 650 typedef typename iterator_traits<_Iter>::pointer pointer; 651 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 652 random_access_iterator_tag, 653 typename iterator_traits<_Iter>::iterator_category> iterator_category; 654#if _LIBCPP_STD_VER > 17 655 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 656 random_access_iterator_tag, 657 bidirectional_iterator_tag> iterator_concept; 658#endif 659 660 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 661 reverse_iterator() : __t(), current() {} 662 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 663 explicit reverse_iterator(_Iter __x) : __t(__x), current(__x) {} 664 template <class _Up> 665 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 666 reverse_iterator(const reverse_iterator<_Up>& __u) : __t(__u.base()), current(__u.base()) {} 667 template <class _Up> 668 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 669 reverse_iterator& operator=(const reverse_iterator<_Up>& __u) 670 { __t = current = __u.base(); return *this; } 671 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 672 _Iter base() const {return current;} 673 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 674 reference operator*() const {_Iter __tmp = current; return *--__tmp;} 675 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 676 pointer operator->() const {return _VSTD::addressof(operator*());} 677 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 678 reverse_iterator& operator++() {--current; return *this;} 679 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 680 reverse_iterator operator++(int) {reverse_iterator __tmp(*this); --current; return __tmp;} 681 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 682 reverse_iterator& operator--() {++current; return *this;} 683 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 684 reverse_iterator operator--(int) {reverse_iterator __tmp(*this); ++current; return __tmp;} 685 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 686 reverse_iterator operator+ (difference_type __n) const {return reverse_iterator(current - __n);} 687 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 688 reverse_iterator& operator+=(difference_type __n) {current -= __n; return *this;} 689 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 690 reverse_iterator operator- (difference_type __n) const {return reverse_iterator(current + __n);} 691 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 692 reverse_iterator& operator-=(difference_type __n) {current += __n; return *this;} 693 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 694 reference operator[](difference_type __n) const {return *(*this + __n);} 695}; 696 697template <class _Iter1, class _Iter2> 698inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 699bool 700operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 701{ 702 return __x.base() == __y.base(); 703} 704 705template <class _Iter1, class _Iter2> 706inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 707bool 708operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 709{ 710 return __x.base() > __y.base(); 711} 712 713template <class _Iter1, class _Iter2> 714inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 715bool 716operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 717{ 718 return __x.base() != __y.base(); 719} 720 721template <class _Iter1, class _Iter2> 722inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 723bool 724operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 725{ 726 return __x.base() < __y.base(); 727} 728 729template <class _Iter1, class _Iter2> 730inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 731bool 732operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 733{ 734 return __x.base() <= __y.base(); 735} 736 737template <class _Iter1, class _Iter2> 738inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 739bool 740operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 741{ 742 return __x.base() >= __y.base(); 743} 744 745#ifndef _LIBCPP_CXX03_LANG 746template <class _Iter1, class _Iter2> 747inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 748auto 749operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 750-> decltype(__y.base() - __x.base()) 751{ 752 return __y.base() - __x.base(); 753} 754#else 755template <class _Iter1, class _Iter2> 756inline _LIBCPP_INLINE_VISIBILITY 757typename reverse_iterator<_Iter1>::difference_type 758operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 759{ 760 return __y.base() - __x.base(); 761} 762#endif 763 764template <class _Iter> 765inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 766reverse_iterator<_Iter> 767operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_iterator<_Iter>& __x) 768{ 769 return reverse_iterator<_Iter>(__x.base() - __n); 770} 771 772#if _LIBCPP_STD_VER > 11 773template <class _Iter> 774inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 775reverse_iterator<_Iter> make_reverse_iterator(_Iter __i) 776{ 777 return reverse_iterator<_Iter>(__i); 778} 779#endif 780 781template <class _Container> 782class _LIBCPP_TEMPLATE_VIS back_insert_iterator 783 : public iterator<output_iterator_tag, 784 void, 785 void, 786 void, 787 void> 788{ 789protected: 790 _Container* container; 791public: 792 typedef _Container container_type; 793 794 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 explicit back_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {} 795 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator=(const typename _Container::value_type& __value_) 796 {container->push_back(__value_); return *this;} 797#ifndef _LIBCPP_CXX03_LANG 798 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator=(typename _Container::value_type&& __value_) 799 {container->push_back(_VSTD::move(__value_)); return *this;} 800#endif // _LIBCPP_CXX03_LANG 801 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator*() {return *this;} 802 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator++() {return *this;} 803 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator operator++(int) {return *this;} 804}; 805 806template <class _Container> 807inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 808back_insert_iterator<_Container> 809back_inserter(_Container& __x) 810{ 811 return back_insert_iterator<_Container>(__x); 812} 813 814template <class _Container> 815class _LIBCPP_TEMPLATE_VIS front_insert_iterator 816 : public iterator<output_iterator_tag, 817 void, 818 void, 819 void, 820 void> 821{ 822protected: 823 _Container* container; 824public: 825 typedef _Container container_type; 826 827 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 explicit front_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {} 828 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator=(const typename _Container::value_type& __value_) 829 {container->push_front(__value_); return *this;} 830#ifndef _LIBCPP_CXX03_LANG 831 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator=(typename _Container::value_type&& __value_) 832 {container->push_front(_VSTD::move(__value_)); return *this;} 833#endif // _LIBCPP_CXX03_LANG 834 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator*() {return *this;} 835 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator++() {return *this;} 836 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator operator++(int) {return *this;} 837}; 838 839template <class _Container> 840inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 841front_insert_iterator<_Container> 842front_inserter(_Container& __x) 843{ 844 return front_insert_iterator<_Container>(__x); 845} 846 847template <class _Container> 848class _LIBCPP_TEMPLATE_VIS insert_iterator 849 : public iterator<output_iterator_tag, 850 void, 851 void, 852 void, 853 void> 854{ 855protected: 856 _Container* container; 857 typename _Container::iterator iter; 858public: 859 typedef _Container container_type; 860 861 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator(_Container& __x, typename _Container::iterator __i) 862 : container(_VSTD::addressof(__x)), iter(__i) {} 863 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(const typename _Container::value_type& __value_) 864 {iter = container->insert(iter, __value_); ++iter; return *this;} 865#ifndef _LIBCPP_CXX03_LANG 866 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(typename _Container::value_type&& __value_) 867 {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;} 868#endif // _LIBCPP_CXX03_LANG 869 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator*() {return *this;} 870 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++() {return *this;} 871 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++(int) {return *this;} 872}; 873 874template <class _Container> 875inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 876insert_iterator<_Container> 877inserter(_Container& __x, typename _Container::iterator __i) 878{ 879 return insert_iterator<_Container>(__x, __i); 880} 881 882template <class _Tp, class _CharT = char, 883 class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t> 884class _LIBCPP_TEMPLATE_VIS istream_iterator 885 : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&> 886{ 887public: 888 typedef _CharT char_type; 889 typedef _Traits traits_type; 890 typedef basic_istream<_CharT,_Traits> istream_type; 891private: 892 istream_type* __in_stream_; 893 _Tp __value_; 894public: 895 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {} 896 _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s)) 897 { 898 if (!(*__in_stream_ >> __value_)) 899 __in_stream_ = nullptr; 900 } 901 902 _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;} 903 _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));} 904 _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++() 905 { 906 if (!(*__in_stream_ >> __value_)) 907 __in_stream_ = nullptr; 908 return *this; 909 } 910 _LIBCPP_INLINE_VISIBILITY istream_iterator operator++(int) 911 {istream_iterator __t(*this); ++(*this); return __t;} 912 913 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 914 friend _LIBCPP_INLINE_VISIBILITY 915 bool 916 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 917 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 918 919 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 920 friend _LIBCPP_INLINE_VISIBILITY 921 bool 922 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 923 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 924}; 925 926template <class _Tp, class _CharT, class _Traits, class _Distance> 927inline _LIBCPP_INLINE_VISIBILITY 928bool 929operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 930 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 931{ 932 return __x.__in_stream_ == __y.__in_stream_; 933} 934 935template <class _Tp, class _CharT, class _Traits, class _Distance> 936inline _LIBCPP_INLINE_VISIBILITY 937bool 938operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 939 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 940{ 941 return !(__x == __y); 942} 943 944template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT> > 945class _LIBCPP_TEMPLATE_VIS ostream_iterator 946 : public iterator<output_iterator_tag, void, void, void, void> 947{ 948public: 949 typedef output_iterator_tag iterator_category; 950 typedef void value_type; 951#if _LIBCPP_STD_VER > 17 952 typedef std::ptrdiff_t difference_type; 953#else 954 typedef void difference_type; 955#endif 956 typedef void pointer; 957 typedef void reference; 958 typedef _CharT char_type; 959 typedef _Traits traits_type; 960 typedef basic_ostream<_CharT, _Traits> ostream_type; 961 962private: 963 ostream_type* __out_stream_; 964 const char_type* __delim_; 965public: 966 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s) _NOEXCEPT 967 : __out_stream_(_VSTD::addressof(__s)), __delim_(nullptr) {} 968 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter) _NOEXCEPT 969 : __out_stream_(_VSTD::addressof(__s)), __delim_(__delimiter) {} 970 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator=(const _Tp& __value_) 971 { 972 *__out_stream_ << __value_; 973 if (__delim_) 974 *__out_stream_ << __delim_; 975 return *this; 976 } 977 978 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator*() {return *this;} 979 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++() {return *this;} 980 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++(int) {return *this;} 981}; 982 983template<class _CharT, class _Traits> 984class _LIBCPP_TEMPLATE_VIS istreambuf_iterator 985 : public iterator<input_iterator_tag, _CharT, 986 typename _Traits::off_type, _CharT*, 987 _CharT> 988{ 989public: 990 typedef _CharT char_type; 991 typedef _Traits traits_type; 992 typedef typename _Traits::int_type int_type; 993 typedef basic_streambuf<_CharT,_Traits> streambuf_type; 994 typedef basic_istream<_CharT,_Traits> istream_type; 995private: 996 mutable streambuf_type* __sbuf_; 997 998 class __proxy 999 { 1000 char_type __keep_; 1001 streambuf_type* __sbuf_; 1002 _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s) 1003 : __keep_(__c), __sbuf_(__s) {} 1004 friend class istreambuf_iterator; 1005 public: 1006 _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;} 1007 }; 1008 1009 _LIBCPP_INLINE_VISIBILITY 1010 bool __test_for_eof() const 1011 { 1012 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof())) 1013 __sbuf_ = nullptr; 1014 return __sbuf_ == nullptr; 1015 } 1016public: 1017 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {} 1018 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT 1019 : __sbuf_(__s.rdbuf()) {} 1020 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT 1021 : __sbuf_(__s) {} 1022 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT 1023 : __sbuf_(__p.__sbuf_) {} 1024 1025 _LIBCPP_INLINE_VISIBILITY char_type operator*() const 1026 {return static_cast<char_type>(__sbuf_->sgetc());} 1027 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++() 1028 { 1029 __sbuf_->sbumpc(); 1030 return *this; 1031 } 1032 _LIBCPP_INLINE_VISIBILITY __proxy operator++(int) 1033 { 1034 return __proxy(__sbuf_->sbumpc(), __sbuf_); 1035 } 1036 1037 _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const 1038 {return __test_for_eof() == __b.__test_for_eof();} 1039}; 1040 1041template <class _CharT, class _Traits> 1042inline _LIBCPP_INLINE_VISIBILITY 1043bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a, 1044 const istreambuf_iterator<_CharT,_Traits>& __b) 1045 {return __a.equal(__b);} 1046 1047template <class _CharT, class _Traits> 1048inline _LIBCPP_INLINE_VISIBILITY 1049bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a, 1050 const istreambuf_iterator<_CharT,_Traits>& __b) 1051 {return !__a.equal(__b);} 1052 1053template <class _CharT, class _Traits> 1054class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator 1055 : public iterator<output_iterator_tag, void, void, void, void> 1056{ 1057public: 1058 typedef output_iterator_tag iterator_category; 1059 typedef void value_type; 1060#if _LIBCPP_STD_VER > 17 1061 typedef std::ptrdiff_t difference_type; 1062#else 1063 typedef void difference_type; 1064#endif 1065 typedef void pointer; 1066 typedef void reference; 1067 typedef _CharT char_type; 1068 typedef _Traits traits_type; 1069 typedef basic_streambuf<_CharT, _Traits> streambuf_type; 1070 typedef basic_ostream<_CharT, _Traits> ostream_type; 1071 1072private: 1073 streambuf_type* __sbuf_; 1074public: 1075 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) _NOEXCEPT 1076 : __sbuf_(__s.rdbuf()) {} 1077 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT 1078 : __sbuf_(__s) {} 1079 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c) 1080 { 1081 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof())) 1082 __sbuf_ = nullptr; 1083 return *this; 1084 } 1085 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*() {return *this;} 1086 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++() {return *this;} 1087 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;} 1088 _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == nullptr;} 1089 1090 template <class _Ch, class _Tr> 1091 friend 1092 _LIBCPP_HIDDEN 1093 ostreambuf_iterator<_Ch, _Tr> 1094 __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s, 1095 const _Ch* __ob, const _Ch* __op, const _Ch* __oe, 1096 ios_base& __iob, _Ch __fl); 1097}; 1098 1099template <class _Iter> 1100class _LIBCPP_TEMPLATE_VIS move_iterator 1101{ 1102private: 1103 _Iter __i; 1104public: 1105 typedef _Iter iterator_type; 1106 typedef typename iterator_traits<iterator_type>::value_type value_type; 1107 typedef typename iterator_traits<iterator_type>::difference_type difference_type; 1108 typedef iterator_type pointer; 1109 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 1110 random_access_iterator_tag, 1111 typename iterator_traits<_Iter>::iterator_category> iterator_category; 1112#if _LIBCPP_STD_VER > 17 1113 typedef input_iterator_tag iterator_concept; 1114#endif 1115 1116#ifndef _LIBCPP_CXX03_LANG 1117 typedef typename iterator_traits<iterator_type>::reference __reference; 1118 typedef typename conditional< 1119 is_reference<__reference>::value, 1120 typename remove_reference<__reference>::type&&, 1121 __reference 1122 >::type reference; 1123#else 1124 typedef typename iterator_traits<iterator_type>::reference reference; 1125#endif 1126 1127 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1128 move_iterator() : __i() {} 1129 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1130 explicit move_iterator(_Iter __x) : __i(__x) {} 1131 template <class _Up> 1132 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1133 move_iterator(const move_iterator<_Up>& __u) : __i(__u.base()) {} 1134 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 _Iter base() const {return __i;} 1135 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1136 reference operator*() const { return static_cast<reference>(*__i); } 1137 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1138 pointer operator->() const { return __i;} 1139 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1140 move_iterator& operator++() {++__i; return *this;} 1141 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1142 move_iterator operator++(int) {move_iterator __tmp(*this); ++__i; return __tmp;} 1143 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1144 move_iterator& operator--() {--__i; return *this;} 1145 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1146 move_iterator operator--(int) {move_iterator __tmp(*this); --__i; return __tmp;} 1147 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1148 move_iterator operator+ (difference_type __n) const {return move_iterator(__i + __n);} 1149 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1150 move_iterator& operator+=(difference_type __n) {__i += __n; return *this;} 1151 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1152 move_iterator operator- (difference_type __n) const {return move_iterator(__i - __n);} 1153 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1154 move_iterator& operator-=(difference_type __n) {__i -= __n; return *this;} 1155 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1156 reference operator[](difference_type __n) const { return static_cast<reference>(__i[__n]); } 1157}; 1158 1159template <class _Iter1, class _Iter2> 1160inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1161bool 1162operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1163{ 1164 return __x.base() == __y.base(); 1165} 1166 1167template <class _Iter1, class _Iter2> 1168inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1169bool 1170operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1171{ 1172 return __x.base() < __y.base(); 1173} 1174 1175template <class _Iter1, class _Iter2> 1176inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1177bool 1178operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1179{ 1180 return __x.base() != __y.base(); 1181} 1182 1183template <class _Iter1, class _Iter2> 1184inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1185bool 1186operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1187{ 1188 return __x.base() > __y.base(); 1189} 1190 1191template <class _Iter1, class _Iter2> 1192inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1193bool 1194operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1195{ 1196 return __x.base() >= __y.base(); 1197} 1198 1199template <class _Iter1, class _Iter2> 1200inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1201bool 1202operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1203{ 1204 return __x.base() <= __y.base(); 1205} 1206 1207#ifndef _LIBCPP_CXX03_LANG 1208template <class _Iter1, class _Iter2> 1209inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1210auto 1211operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1212-> decltype(__x.base() - __y.base()) 1213{ 1214 return __x.base() - __y.base(); 1215} 1216#else 1217template <class _Iter1, class _Iter2> 1218inline _LIBCPP_INLINE_VISIBILITY 1219typename move_iterator<_Iter1>::difference_type 1220operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1221{ 1222 return __x.base() - __y.base(); 1223} 1224#endif 1225 1226template <class _Iter> 1227inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1228move_iterator<_Iter> 1229operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x) 1230{ 1231 return move_iterator<_Iter>(__x.base() + __n); 1232} 1233 1234template <class _Iter> 1235inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1236move_iterator<_Iter> 1237make_move_iterator(_Iter __i) 1238{ 1239 return move_iterator<_Iter>(__i); 1240} 1241 1242// __wrap_iter 1243 1244template <class _Iter> class __wrap_iter; 1245 1246template <class _Iter1, class _Iter2> 1247_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1248bool 1249operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1250 1251template <class _Iter1, class _Iter2> 1252_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1253bool 1254operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1255 1256template <class _Iter1, class _Iter2> 1257_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1258bool 1259operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1260 1261template <class _Iter1, class _Iter2> 1262_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1263bool 1264operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1265 1266template <class _Iter1, class _Iter2> 1267_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1268bool 1269operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1270 1271template <class _Iter1, class _Iter2> 1272_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1273bool 1274operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1275 1276#ifndef _LIBCPP_CXX03_LANG 1277template <class _Iter1, class _Iter2> 1278_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1279auto 1280operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1281-> decltype(__x.base() - __y.base()); 1282#else 1283template <class _Iter1, class _Iter2> 1284_LIBCPP_INLINE_VISIBILITY 1285typename __wrap_iter<_Iter1>::difference_type 1286operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1287#endif 1288 1289template <class _Iter> 1290_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1291__wrap_iter<_Iter> 1292operator+(typename __wrap_iter<_Iter>::difference_type, __wrap_iter<_Iter>) _NOEXCEPT; 1293 1294template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 copy(_Ip, _Ip, _Op); 1295template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 copy_backward(_B1, _B1, _B2); 1296template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 move(_Ip, _Ip, _Op); 1297template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 move_backward(_B1, _B1, _B2); 1298 1299template <class _Iter> 1300class __wrap_iter 1301{ 1302public: 1303 typedef _Iter iterator_type; 1304 typedef typename iterator_traits<iterator_type>::value_type value_type; 1305 typedef typename iterator_traits<iterator_type>::difference_type difference_type; 1306 typedef typename iterator_traits<iterator_type>::pointer pointer; 1307 typedef typename iterator_traits<iterator_type>::reference reference; 1308 typedef typename iterator_traits<iterator_type>::iterator_category iterator_category; 1309#if _LIBCPP_STD_VER > 17 1310 typedef contiguous_iterator_tag iterator_concept; 1311#endif 1312 1313private: 1314 iterator_type __i; 1315public: 1316 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter() _NOEXCEPT 1317#if _LIBCPP_STD_VER > 11 1318 : __i{} 1319#endif 1320 { 1321#if _LIBCPP_DEBUG_LEVEL == 2 1322 __get_db()->__insert_i(this); 1323#endif 1324 } 1325 template <class _Up> _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1326 __wrap_iter(const __wrap_iter<_Up>& __u, 1327 typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = nullptr) _NOEXCEPT 1328 : __i(__u.base()) 1329 { 1330#if _LIBCPP_DEBUG_LEVEL == 2 1331 __get_db()->__iterator_copy(this, &__u); 1332#endif 1333 } 1334#if _LIBCPP_DEBUG_LEVEL == 2 1335 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1336 __wrap_iter(const __wrap_iter& __x) 1337 : __i(__x.base()) 1338 { 1339 __get_db()->__iterator_copy(this, &__x); 1340 } 1341 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1342 __wrap_iter& operator=(const __wrap_iter& __x) 1343 { 1344 if (this != &__x) 1345 { 1346 __get_db()->__iterator_copy(this, &__x); 1347 __i = __x.__i; 1348 } 1349 return *this; 1350 } 1351 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1352 ~__wrap_iter() 1353 { 1354 __get_db()->__erase_i(this); 1355 } 1356#endif 1357 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator*() const _NOEXCEPT 1358 { 1359#if _LIBCPP_DEBUG_LEVEL == 2 1360 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1361 "Attempted to dereference a non-dereferenceable iterator"); 1362#endif 1363 return *__i; 1364 } 1365 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG pointer operator->() const _NOEXCEPT 1366 { 1367#if _LIBCPP_DEBUG_LEVEL == 2 1368 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1369 "Attempted to dereference a non-dereferenceable iterator"); 1370#endif 1371 return _VSTD::__to_address(__i); 1372 } 1373 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator++() _NOEXCEPT 1374 { 1375#if _LIBCPP_DEBUG_LEVEL == 2 1376 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1377 "Attempted to increment a non-incrementable iterator"); 1378#endif 1379 ++__i; 1380 return *this; 1381 } 1382 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator++(int) _NOEXCEPT 1383 {__wrap_iter __tmp(*this); ++(*this); return __tmp;} 1384 1385 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator--() _NOEXCEPT 1386 { 1387#if _LIBCPP_DEBUG_LEVEL == 2 1388 _LIBCPP_ASSERT(__get_const_db()->__decrementable(this), 1389 "Attempted to decrement a non-decrementable iterator"); 1390#endif 1391 --__i; 1392 return *this; 1393 } 1394 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator--(int) _NOEXCEPT 1395 {__wrap_iter __tmp(*this); --(*this); return __tmp;} 1396 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator+ (difference_type __n) const _NOEXCEPT 1397 {__wrap_iter __w(*this); __w += __n; return __w;} 1398 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator+=(difference_type __n) _NOEXCEPT 1399 { 1400#if _LIBCPP_DEBUG_LEVEL == 2 1401 _LIBCPP_ASSERT(__get_const_db()->__addable(this, __n), 1402 "Attempted to add/subtract an iterator outside its valid range"); 1403#endif 1404 __i += __n; 1405 return *this; 1406 } 1407 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator- (difference_type __n) const _NOEXCEPT 1408 {return *this + (-__n);} 1409 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator-=(difference_type __n) _NOEXCEPT 1410 {*this += -__n; return *this;} 1411 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator[](difference_type __n) const _NOEXCEPT 1412 { 1413#if _LIBCPP_DEBUG_LEVEL == 2 1414 _LIBCPP_ASSERT(__get_const_db()->__subscriptable(this, __n), 1415 "Attempted to subscript an iterator outside its valid range"); 1416#endif 1417 return __i[__n]; 1418 } 1419 1420 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG iterator_type base() const _NOEXCEPT {return __i;} 1421 1422private: 1423#if _LIBCPP_DEBUG_LEVEL == 2 1424 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(const void* __p, iterator_type __x) : __i(__x) 1425 { 1426 __get_db()->__insert_ic(this, __p); 1427 } 1428#else 1429 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {} 1430#endif 1431 1432 template <class _Up> friend class __wrap_iter; 1433 template <class _CharT, class _Traits, class _Alloc> friend class basic_string; 1434 template <class _Tp, class _Alloc> friend class _LIBCPP_TEMPLATE_VIS vector; 1435 template <class _Tp, size_t> friend class _LIBCPP_TEMPLATE_VIS span; 1436 1437 template <class _Iter1, class _Iter2> 1438 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1439 bool 1440 operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1441 1442 template <class _Iter1, class _Iter2> 1443 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1444 bool 1445 operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1446 1447 template <class _Iter1, class _Iter2> 1448 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1449 bool 1450 operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1451 1452 template <class _Iter1, class _Iter2> 1453 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1454 bool 1455 operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1456 1457 template <class _Iter1, class _Iter2> 1458 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1459 bool 1460 operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1461 1462 template <class _Iter1, class _Iter2> 1463 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1464 bool 1465 operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1466 1467#ifndef _LIBCPP_CXX03_LANG 1468 template <class _Iter1, class _Iter2> 1469 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1470 auto 1471 operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1472 -> decltype(__x.base() - __y.base()); 1473#else 1474 template <class _Iter1, class _Iter2> 1475 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1476 typename __wrap_iter<_Iter1>::difference_type 1477 operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1478#endif 1479 1480 template <class _Iter1> 1481 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1482 __wrap_iter<_Iter1> 1483 operator+(typename __wrap_iter<_Iter1>::difference_type, __wrap_iter<_Iter1>) _NOEXCEPT; 1484}; 1485 1486#if _LIBCPP_STD_VER <= 17 1487template <class _It> 1488struct __is_cpp17_contiguous_iterator<__wrap_iter<_It> > : true_type {}; 1489#endif 1490 1491template <class _Iter> 1492_LIBCPP_CONSTEXPR 1493decltype(_VSTD::__to_address(declval<_Iter>())) 1494__to_address(__wrap_iter<_Iter> __w) _NOEXCEPT { 1495 return _VSTD::__to_address(__w.base()); 1496} 1497 1498template <class _Iter1, class _Iter2> 1499inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1500bool 1501operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1502{ 1503 return __x.base() == __y.base(); 1504} 1505 1506template <class _Iter1, class _Iter2> 1507inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1508bool 1509operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1510{ 1511#if _LIBCPP_DEBUG_LEVEL == 2 1512 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1513 "Attempted to compare incomparable iterators"); 1514#endif 1515 return __x.base() < __y.base(); 1516} 1517 1518template <class _Iter1, class _Iter2> 1519inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1520bool 1521operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1522{ 1523 return !(__x == __y); 1524} 1525 1526template <class _Iter1, class _Iter2> 1527inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1528bool 1529operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1530{ 1531 return __y < __x; 1532} 1533 1534template <class _Iter1, class _Iter2> 1535inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1536bool 1537operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1538{ 1539 return !(__x < __y); 1540} 1541 1542template <class _Iter1, class _Iter2> 1543inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1544bool 1545operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1546{ 1547 return !(__y < __x); 1548} 1549 1550template <class _Iter1> 1551inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1552bool 1553operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1554{ 1555 return !(__x == __y); 1556} 1557 1558template <class _Iter1> 1559inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1560bool 1561operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1562{ 1563 return __y < __x; 1564} 1565 1566template <class _Iter1> 1567inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1568bool 1569operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1570{ 1571 return !(__x < __y); 1572} 1573 1574template <class _Iter1> 1575inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1576bool 1577operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1578{ 1579 return !(__y < __x); 1580} 1581 1582#ifndef _LIBCPP_CXX03_LANG 1583template <class _Iter1, class _Iter2> 1584inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1585auto 1586operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1587-> decltype(__x.base() - __y.base()) 1588{ 1589#if _LIBCPP_DEBUG_LEVEL == 2 1590 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1591 "Attempted to subtract incompatible iterators"); 1592#endif 1593 return __x.base() - __y.base(); 1594} 1595#else 1596template <class _Iter1, class _Iter2> 1597inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1598typename __wrap_iter<_Iter1>::difference_type 1599operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1600{ 1601#if _LIBCPP_DEBUG_LEVEL == 2 1602 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1603 "Attempted to subtract incompatible iterators"); 1604#endif 1605 return __x.base() - __y.base(); 1606} 1607#endif 1608 1609template <class _Iter> 1610inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1611__wrap_iter<_Iter> 1612operator+(typename __wrap_iter<_Iter>::difference_type __n, 1613 __wrap_iter<_Iter> __x) _NOEXCEPT 1614{ 1615 __x += __n; 1616 return __x; 1617} 1618 1619template <class _Tp, size_t _Np> 1620_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1621_Tp* 1622begin(_Tp (&__array)[_Np]) 1623{ 1624 return __array; 1625} 1626 1627template <class _Tp, size_t _Np> 1628_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1629_Tp* 1630end(_Tp (&__array)[_Np]) 1631{ 1632 return __array + _Np; 1633} 1634 1635#if !defined(_LIBCPP_CXX03_LANG) 1636 1637template <class _Cp> 1638_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1639auto 1640begin(_Cp& __c) -> decltype(__c.begin()) 1641{ 1642 return __c.begin(); 1643} 1644 1645template <class _Cp> 1646_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1647auto 1648begin(const _Cp& __c) -> decltype(__c.begin()) 1649{ 1650 return __c.begin(); 1651} 1652 1653template <class _Cp> 1654_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1655auto 1656end(_Cp& __c) -> decltype(__c.end()) 1657{ 1658 return __c.end(); 1659} 1660 1661template <class _Cp> 1662_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1663auto 1664end(const _Cp& __c) -> decltype(__c.end()) 1665{ 1666 return __c.end(); 1667} 1668 1669#if _LIBCPP_STD_VER > 11 1670 1671template <class _Tp, size_t _Np> 1672_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1673reverse_iterator<_Tp*> rbegin(_Tp (&__array)[_Np]) 1674{ 1675 return reverse_iterator<_Tp*>(__array + _Np); 1676} 1677 1678template <class _Tp, size_t _Np> 1679_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1680reverse_iterator<_Tp*> rend(_Tp (&__array)[_Np]) 1681{ 1682 return reverse_iterator<_Tp*>(__array); 1683} 1684 1685template <class _Ep> 1686_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1687reverse_iterator<const _Ep*> rbegin(initializer_list<_Ep> __il) 1688{ 1689 return reverse_iterator<const _Ep*>(__il.end()); 1690} 1691 1692template <class _Ep> 1693_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1694reverse_iterator<const _Ep*> rend(initializer_list<_Ep> __il) 1695{ 1696 return reverse_iterator<const _Ep*>(__il.begin()); 1697} 1698 1699template <class _Cp> 1700_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1701auto cbegin(const _Cp& __c) -> decltype(_VSTD::begin(__c)) 1702{ 1703 return _VSTD::begin(__c); 1704} 1705 1706template <class _Cp> 1707_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1708auto cend(const _Cp& __c) -> decltype(_VSTD::end(__c)) 1709{ 1710 return _VSTD::end(__c); 1711} 1712 1713template <class _Cp> 1714_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1715auto rbegin(_Cp& __c) -> decltype(__c.rbegin()) 1716{ 1717 return __c.rbegin(); 1718} 1719 1720template <class _Cp> 1721_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1722auto rbegin(const _Cp& __c) -> decltype(__c.rbegin()) 1723{ 1724 return __c.rbegin(); 1725} 1726 1727template <class _Cp> 1728_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1729auto rend(_Cp& __c) -> decltype(__c.rend()) 1730{ 1731 return __c.rend(); 1732} 1733 1734template <class _Cp> 1735_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1736auto rend(const _Cp& __c) -> decltype(__c.rend()) 1737{ 1738 return __c.rend(); 1739} 1740 1741template <class _Cp> 1742_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1743auto crbegin(const _Cp& __c) -> decltype(_VSTD::rbegin(__c)) 1744{ 1745 return _VSTD::rbegin(__c); 1746} 1747 1748template <class _Cp> 1749_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1750auto crend(const _Cp& __c) -> decltype(_VSTD::rend(__c)) 1751{ 1752 return _VSTD::rend(__c); 1753} 1754 1755#endif 1756 1757 1758#else // defined(_LIBCPP_CXX03_LANG) 1759 1760template <class _Cp> 1761_LIBCPP_INLINE_VISIBILITY 1762typename _Cp::iterator 1763begin(_Cp& __c) 1764{ 1765 return __c.begin(); 1766} 1767 1768template <class _Cp> 1769_LIBCPP_INLINE_VISIBILITY 1770typename _Cp::const_iterator 1771begin(const _Cp& __c) 1772{ 1773 return __c.begin(); 1774} 1775 1776template <class _Cp> 1777_LIBCPP_INLINE_VISIBILITY 1778typename _Cp::iterator 1779end(_Cp& __c) 1780{ 1781 return __c.end(); 1782} 1783 1784template <class _Cp> 1785_LIBCPP_INLINE_VISIBILITY 1786typename _Cp::const_iterator 1787end(const _Cp& __c) 1788{ 1789 return __c.end(); 1790} 1791 1792#endif // !defined(_LIBCPP_CXX03_LANG) 1793 1794#if _LIBCPP_STD_VER > 14 1795 1796// #if _LIBCPP_STD_VER > 11 1797// template <> 1798// struct _LIBCPP_TEMPLATE_VIS plus<void> 1799// { 1800// template <class _T1, class _T2> 1801// _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 1802// auto operator()(_T1&& __t, _T2&& __u) const 1803// _NOEXCEPT_(noexcept(_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u))) 1804// -> decltype (_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u)) 1805// { return _VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u); } 1806// typedef void is_transparent; 1807// }; 1808// #endif 1809 1810template <class _Cont> 1811_LIBCPP_INLINE_VISIBILITY 1812constexpr auto size(const _Cont& __c) 1813_NOEXCEPT_(noexcept(__c.size())) 1814-> decltype (__c.size()) 1815{ return __c.size(); } 1816 1817template <class _Tp, size_t _Sz> 1818_LIBCPP_INLINE_VISIBILITY 1819constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; } 1820 1821#if _LIBCPP_STD_VER > 17 1822template <class _Cont> 1823_LIBCPP_INLINE_VISIBILITY 1824constexpr auto ssize(const _Cont& __c) 1825_NOEXCEPT_(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()))) 1826-> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>> 1827{ return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); } 1828 1829template <class _Tp, ptrdiff_t _Sz> 1830_LIBCPP_INLINE_VISIBILITY 1831constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { return _Sz; } 1832#endif 1833 1834template <class _Cont> 1835_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 1836constexpr auto empty(const _Cont& __c) 1837_NOEXCEPT_(noexcept(__c.empty())) 1838-> decltype (__c.empty()) 1839{ return __c.empty(); } 1840 1841template <class _Tp, size_t _Sz> 1842_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 1843constexpr bool empty(const _Tp (&)[_Sz]) noexcept { return false; } 1844 1845template <class _Ep> 1846_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 1847constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; } 1848 1849template <class _Cont> constexpr 1850_LIBCPP_INLINE_VISIBILITY 1851auto data(_Cont& __c) 1852_NOEXCEPT_(noexcept(__c.data())) 1853-> decltype (__c.data()) 1854{ return __c.data(); } 1855 1856template <class _Cont> constexpr 1857_LIBCPP_INLINE_VISIBILITY 1858auto data(const _Cont& __c) 1859_NOEXCEPT_(noexcept(__c.data())) 1860-> decltype (__c.data()) 1861{ return __c.data(); } 1862 1863template <class _Tp, size_t _Sz> 1864_LIBCPP_INLINE_VISIBILITY 1865constexpr _Tp* data(_Tp (&__array)[_Sz]) noexcept { return __array; } 1866 1867template <class _Ep> 1868_LIBCPP_INLINE_VISIBILITY 1869constexpr const _Ep* data(initializer_list<_Ep> __il) noexcept { return __il.begin(); } 1870#endif 1871 1872template <class _Container, class _Predicate> 1873typename _Container::size_type 1874__libcpp_erase_if_container(_Container& __c, _Predicate& __pred) { 1875 typename _Container::size_type __old_size = __c.size(); 1876 1877 const typename _Container::iterator __last = __c.end(); 1878 for (typename _Container::iterator __iter = __c.begin(); __iter != __last;) { 1879 if (__pred(*__iter)) 1880 __iter = __c.erase(__iter); 1881 else 1882 ++__iter; 1883 } 1884 1885 return __old_size - __c.size(); 1886} 1887 1888_LIBCPP_END_NAMESPACE_STD 1889 1890#endif // _LIBCPP_ITERATOR 1891