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> struct indirectly_readable_traits; // since C++20 22 23template<class Iterator> 24struct iterator_traits 25{ 26 typedef typename Iterator::difference_type difference_type; 27 typedef typename Iterator::value_type value_type; 28 typedef typename Iterator::pointer pointer; 29 typedef typename Iterator::reference reference; 30 typedef typename Iterator::iterator_category iterator_category; 31}; 32 33template<class T> 34struct iterator_traits<T*> 35{ 36 typedef ptrdiff_t difference_type; 37 typedef T value_type; 38 typedef T* pointer; 39 typedef T& reference; 40 typedef random_access_iterator_tag iterator_category; 41}; 42 43template<dereferenceable T> 44 using iter_reference_t = decltype(*declval<T&>()); 45 46template<class Category, class T, class Distance = ptrdiff_t, 47 class Pointer = T*, class Reference = T&> 48struct iterator 49{ 50 typedef T value_type; 51 typedef Distance difference_type; 52 typedef Pointer pointer; 53 typedef Reference reference; 54 typedef Category iterator_category; 55}; 56 57struct input_iterator_tag {}; 58struct output_iterator_tag {}; 59struct forward_iterator_tag : public input_iterator_tag {}; 60struct bidirectional_iterator_tag : public forward_iterator_tag {}; 61struct random_access_iterator_tag : public bidirectional_iterator_tag {}; 62 63// 27.4.3, iterator operations 64template <class InputIterator, class Distance> // constexpr in C++17 65 constexpr void advance(InputIterator& i, Distance n); 66 67template <class InputIterator> // constexpr in C++17 68 constexpr typename iterator_traits<InputIterator>::difference_type 69 distance(InputIterator first, InputIterator last); 70 71template <class InputIterator> // constexpr in C++17 72 constexpr InputIterator next(InputIterator x, 73typename iterator_traits<InputIterator>::difference_type n = 1); 74 75template <class BidirectionalIterator> // constexpr in C++17 76 constexpr BidirectionalIterator prev(BidirectionalIterator x, 77 typename iterator_traits<BidirectionalIterator>::difference_type n = 1); 78 79template <class Iterator> 80class reverse_iterator 81 : public iterator<typename iterator_traits<Iterator>::iterator_category, 82 typename iterator_traits<Iterator>::value_type, 83 typename iterator_traits<Iterator>::difference_type, 84 typename iterator_traits<Iterator>::pointer, 85 typename iterator_traits<Iterator>::reference> 86{ 87protected: 88 Iterator current; 89public: 90 typedef Iterator iterator_type; 91 typedef typename iterator_traits<Iterator>::difference_type difference_type; 92 typedef typename iterator_traits<Iterator>::reference reference; 93 typedef typename iterator_traits<Iterator>::pointer pointer; 94 95 constexpr reverse_iterator(); 96 constexpr explicit reverse_iterator(Iterator x); 97 template <class U> constexpr reverse_iterator(const reverse_iterator<U>& u); 98 template <class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u); 99 constexpr Iterator base() const; 100 constexpr reference operator*() const; 101 constexpr pointer operator->() const; 102 constexpr reverse_iterator& operator++(); 103 constexpr reverse_iterator operator++(int); 104 constexpr reverse_iterator& operator--(); 105 constexpr reverse_iterator operator--(int); 106 constexpr reverse_iterator operator+ (difference_type n) const; 107 constexpr reverse_iterator& operator+=(difference_type n); 108 constexpr reverse_iterator operator- (difference_type n) const; 109 constexpr reverse_iterator& operator-=(difference_type n); 110 constexpr reference operator[](difference_type n) const; 111}; 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 bool // constexpr in C++17 135operator<=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y); 136 137template <class Iterator1, class Iterator2> 138constexpr auto 139operator-(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y) 140-> decltype(__y.base() - __x.base()); // constexpr in C++17 141 142template <class Iterator> 143constexpr reverse_iterator<Iterator> 144operator+(typename reverse_iterator<Iterator>::difference_type n, 145 const reverse_iterator<Iterator>& x); // constexpr in C++17 146 147template <class Iterator> 148constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i); // C++14, constexpr in C++17 149 150template <class Container> 151class back_insert_iterator 152{ 153protected: 154 Container* container; 155public: 156 typedef Container container_type; 157 typedef void value_type; 158 typedef void difference_type; 159 typedef void reference; 160 typedef void pointer; 161 162 explicit back_insert_iterator(Container& x); // constexpr in C++20 163 back_insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20 164 back_insert_iterator& operator*(); // constexpr in C++20 165 back_insert_iterator& operator++(); // constexpr in C++20 166 back_insert_iterator operator++(int); // constexpr in C++20 167}; 168 169template <class Container> back_insert_iterator<Container> back_inserter(Container& x); // constexpr in C++20 170 171template <class Container> 172class front_insert_iterator 173{ 174protected: 175 Container* container; 176public: 177 typedef Container container_type; 178 typedef void value_type; 179 typedef void difference_type; 180 typedef void reference; 181 typedef void pointer; 182 183 explicit front_insert_iterator(Container& x); // constexpr in C++20 184 front_insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20 185 front_insert_iterator& operator*(); // constexpr in C++20 186 front_insert_iterator& operator++(); // constexpr in C++20 187 front_insert_iterator operator++(int); // constexpr in C++20 188}; 189 190template <class Container> front_insert_iterator<Container> front_inserter(Container& x); // constexpr in C++20 191 192template <class Container> 193class insert_iterator 194{ 195protected: 196 Container* container; 197 typename Container::iterator iter; 198public: 199 typedef Container container_type; 200 typedef void value_type; 201 typedef void difference_type; 202 typedef void reference; 203 typedef void pointer; 204 205 insert_iterator(Container& x, typename Container::iterator i); // constexpr in C++20 206 insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20 207 insert_iterator& operator*(); // constexpr in C++20 208 insert_iterator& operator++(); // constexpr in C++20 209 insert_iterator& operator++(int); // constexpr in C++20 210}; 211 212template <class Container, class Iterator> 213insert_iterator<Container> inserter(Container& x, Iterator i); // constexpr in C++20 214 215template <class Iterator> 216class move_iterator { 217public: 218 typedef Iterator iterator_type; 219 typedef typename iterator_traits<Iterator>::difference_type difference_type; 220 typedef Iterator pointer; 221 typedef typename iterator_traits<Iterator>::value_type value_type; 222 typedef typename iterator_traits<Iterator>::iterator_category iterator_category; 223 typedef value_type&& reference; 224 225 constexpr move_iterator(); // all the constexprs are in C++17 226 constexpr explicit move_iterator(Iterator i); 227 template <class U> 228 constexpr move_iterator(const move_iterator<U>& u); 229 template <class U> 230 constexpr move_iterator& operator=(const move_iterator<U>& u); 231 constexpr iterator_type base() const; 232 constexpr reference operator*() const; 233 constexpr pointer operator->() const; 234 constexpr move_iterator& operator++(); 235 constexpr move_iterator operator++(int); 236 constexpr move_iterator& operator--(); 237 constexpr move_iterator operator--(int); 238 constexpr move_iterator operator+(difference_type n) const; 239 constexpr move_iterator& operator+=(difference_type n); 240 constexpr move_iterator operator-(difference_type n) const; 241 constexpr move_iterator& operator-=(difference_type n); 242 constexpr unspecified operator[](difference_type n) const; 243private: 244 Iterator current; // exposition only 245}; 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 bool // constexpr in C++17 269operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y); 270 271template <class Iterator1, class Iterator2> 272constexpr auto // constexpr in C++17 273operator-(const move_iterator<Iterator1>& x, 274 const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base()); 275 276template <class Iterator> 277constexpr move_iterator<Iterator> operator+( // constexpr in C++17 278 typename move_iterator<Iterator>::difference_type n, 279 const move_iterator<Iterator>& x); 280 281template <class Iterator> // constexpr in C++17 282constexpr move_iterator<Iterator> make_move_iterator(const Iterator& i); 283 284 285template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t> 286class istream_iterator 287 : public iterator<input_iterator_tag, T, Distance, const T*, const T&> 288{ 289public: 290 typedef charT char_type; 291 typedef traits traits_type; 292 typedef basic_istream<charT,traits> istream_type; 293 294 constexpr istream_iterator(); 295 istream_iterator(istream_type& s); 296 istream_iterator(const istream_iterator& x); 297 ~istream_iterator(); 298 299 const T& operator*() const; 300 const T* operator->() const; 301 istream_iterator& operator++(); 302 istream_iterator operator++(int); 303}; 304 305template <class T, class charT, class traits, class Distance> 306bool operator==(const istream_iterator<T,charT,traits,Distance>& x, 307 const istream_iterator<T,charT,traits,Distance>& y); 308template <class T, class charT, class traits, class Distance> 309bool operator!=(const istream_iterator<T,charT,traits,Distance>& x, 310 const istream_iterator<T,charT,traits,Distance>& y); 311 312template <class T, class charT = char, class traits = char_traits<charT> > 313class ostream_iterator 314 : public iterator<output_iterator_tag, void, void, void ,void> 315{ 316public: 317 typedef charT char_type; 318 typedef traits traits_type; 319 typedef basic_ostream<charT,traits> ostream_type; 320 321 ostream_iterator(ostream_type& s); 322 ostream_iterator(ostream_type& s, const charT* delimiter); 323 ostream_iterator(const ostream_iterator& x); 324 ~ostream_iterator(); 325 ostream_iterator& operator=(const T& value); 326 327 ostream_iterator& operator*(); 328 ostream_iterator& operator++(); 329 ostream_iterator& operator++(int); 330}; 331 332template<class charT, class traits = char_traits<charT> > 333class istreambuf_iterator 334 : public iterator<input_iterator_tag, charT, 335 typename traits::off_type, unspecified, 336 charT> 337{ 338public: 339 typedef charT char_type; 340 typedef traits traits_type; 341 typedef typename traits::int_type int_type; 342 typedef basic_streambuf<charT,traits> streambuf_type; 343 typedef basic_istream<charT,traits> istream_type; 344 345 istreambuf_iterator() noexcept; 346 istreambuf_iterator(istream_type& s) noexcept; 347 istreambuf_iterator(streambuf_type* s) noexcept; 348 istreambuf_iterator(a-private-type) noexcept; 349 350 charT operator*() const; 351 pointer operator->() const; 352 istreambuf_iterator& operator++(); 353 a-private-type operator++(int); 354 355 bool equal(const istreambuf_iterator& b) const; 356}; 357 358template <class charT, class traits> 359bool operator==(const istreambuf_iterator<charT,traits>& a, 360 const istreambuf_iterator<charT,traits>& b); 361template <class charT, class traits> 362bool operator!=(const istreambuf_iterator<charT,traits>& a, 363 const istreambuf_iterator<charT,traits>& b); 364 365template <class charT, class traits = char_traits<charT> > 366class ostreambuf_iterator 367 : public iterator<output_iterator_tag, void, void, void, void> 368{ 369public: 370 typedef charT char_type; 371 typedef traits traits_type; 372 typedef basic_streambuf<charT,traits> streambuf_type; 373 typedef basic_ostream<charT,traits> ostream_type; 374 375 ostreambuf_iterator(ostream_type& s) noexcept; 376 ostreambuf_iterator(streambuf_type* s) noexcept; 377 ostreambuf_iterator& operator=(charT c); 378 ostreambuf_iterator& operator*(); 379 ostreambuf_iterator& operator++(); 380 ostreambuf_iterator& operator++(int); 381 bool failed() const noexcept; 382}; 383 384template <class C> constexpr auto begin(C& c) -> decltype(c.begin()); 385template <class C> constexpr auto begin(const C& c) -> decltype(c.begin()); 386template <class C> constexpr auto end(C& c) -> decltype(c.end()); 387template <class C> constexpr auto end(const C& c) -> decltype(c.end()); 388template <class T, size_t N> constexpr T* begin(T (&array)[N]); 389template <class T, size_t N> constexpr T* end(T (&array)[N]); 390 391template <class C> auto constexpr cbegin(const C& c) -> decltype(std::begin(c)); // C++14 392template <class C> auto constexpr cend(const C& c) -> decltype(std::end(c)); // C++14 393template <class C> auto constexpr rbegin(C& c) -> decltype(c.rbegin()); // C++14 394template <class C> auto constexpr rbegin(const C& c) -> decltype(c.rbegin()); // C++14 395template <class C> auto constexpr rend(C& c) -> decltype(c.rend()); // C++14 396template <class C> constexpr auto rend(const C& c) -> decltype(c.rend()); // C++14 397template <class E> reverse_iterator<const E*> constexpr rbegin(initializer_list<E> il); // C++14 398template <class E> reverse_iterator<const E*> constexpr rend(initializer_list<E> il); // C++14 399template <class T, size_t N> reverse_iterator<T*> constexpr rbegin(T (&array)[N]); // C++14 400template <class T, size_t N> reverse_iterator<T*> constexpr rend(T (&array)[N]); // C++14 401template <class C> constexpr auto crbegin(const C& c) -> decltype(std::rbegin(c)); // C++14 402template <class C> constexpr auto crend(const C& c) -> decltype(std::rend(c)); // C++14 403 404// 24.8, container access: 405template <class C> constexpr auto size(const C& c) -> decltype(c.size()); // C++17 406template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17 407 408template <class C> constexpr auto ssize(const C& c) 409 -> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size())>>; // C++20 410template <class T, ptrdiff_t> constexpr ptrdiff_t ssize(const T (&array)[N]) noexcept; // C++20 411 412template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17 413template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17 414template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17 415template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17 416template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17 417template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17 418template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17 419 420} // std 421 422*/ 423 424#include <__config> 425#include <iosfwd> // for forward declarations of vector and string. 426#include <__functional_base> 427#include <type_traits> 428#include <compare> 429#include <concepts> 430#include <cstddef> 431#include <initializer_list> 432#include <__iterator/incrementable_traits.h> 433#include <__iterator/readable_traits.h> 434#include <__memory/addressof.h> 435#include <__memory/pointer_traits.h> 436#include <version> 437 438#include <__debug> 439 440#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 441#pragma GCC system_header 442#endif 443 444_LIBCPP_BEGIN_NAMESPACE_STD 445 446#if !defined(_LIBCPP_HAS_NO_RANGES) 447 448// [iterator.traits] 449template<__dereferenceable _Tp> 450using iter_reference_t = decltype(*declval<_Tp&>()); 451#endif // !defined(_LIBCPP_HAS_NO_RANGES) 452 453template <class _Iter> 454struct _LIBCPP_TEMPLATE_VIS iterator_traits; 455 456struct _LIBCPP_TEMPLATE_VIS input_iterator_tag {}; 457struct _LIBCPP_TEMPLATE_VIS output_iterator_tag {}; 458struct _LIBCPP_TEMPLATE_VIS forward_iterator_tag : public input_iterator_tag {}; 459struct _LIBCPP_TEMPLATE_VIS bidirectional_iterator_tag : public forward_iterator_tag {}; 460struct _LIBCPP_TEMPLATE_VIS random_access_iterator_tag : public bidirectional_iterator_tag {}; 461#if _LIBCPP_STD_VER > 17 462struct _LIBCPP_TEMPLATE_VIS contiguous_iterator_tag : public random_access_iterator_tag {}; 463#endif 464 465template <class _Iter> 466struct __iter_traits_cache { 467 using type = _If< 468 __is_primary_template<iterator_traits<_Iter> >::value, 469 _Iter, 470 iterator_traits<_Iter> 471 >; 472}; 473template <class _Iter> 474using _ITER_TRAITS = typename __iter_traits_cache<_Iter>::type; 475 476struct __iter_concept_concept_test { 477 template <class _Iter> 478 using _Apply = typename _ITER_TRAITS<_Iter>::iterator_concept; 479}; 480struct __iter_concept_category_test { 481 template <class _Iter> 482 using _Apply = typename _ITER_TRAITS<_Iter>::iterator_category; 483}; 484struct __iter_concept_random_fallback { 485 template <class _Iter> 486 using _Apply = _EnableIf< 487 __is_primary_template<iterator_traits<_Iter> >::value, 488 random_access_iterator_tag 489 >; 490}; 491 492template <class _Iter, class _Tester> struct __test_iter_concept 493 : _IsValidExpansion<_Tester::template _Apply, _Iter>, 494 _Tester 495{ 496}; 497 498template <class _Iter> 499struct __iter_concept_cache { 500 using type = _Or< 501 __test_iter_concept<_Iter, __iter_concept_concept_test>, 502 __test_iter_concept<_Iter, __iter_concept_category_test>, 503 __test_iter_concept<_Iter, __iter_concept_random_fallback> 504 >; 505}; 506 507template <class _Iter> 508using _ITER_CONCEPT = typename __iter_concept_cache<_Iter>::type::template _Apply<_Iter>; 509 510 511template <class _Tp> 512struct __has_iterator_typedefs 513{ 514private: 515 struct __two {char __lx; char __lxx;}; 516 template <class _Up> static __two __test(...); 517 template <class _Up> static char __test(typename __void_t<typename _Up::iterator_category>::type* = 0, 518 typename __void_t<typename _Up::difference_type>::type* = 0, 519 typename __void_t<typename _Up::value_type>::type* = 0, 520 typename __void_t<typename _Up::reference>::type* = 0, 521 typename __void_t<typename _Up::pointer>::type* = 0); 522public: 523 static const bool value = sizeof(__test<_Tp>(0,0,0,0,0)) == 1; 524}; 525 526 527template <class _Tp> 528struct __has_iterator_category 529{ 530private: 531 struct __two {char __lx; char __lxx;}; 532 template <class _Up> static __two __test(...); 533 template <class _Up> static char __test(typename _Up::iterator_category* = nullptr); 534public: 535 static const bool value = sizeof(__test<_Tp>(nullptr)) == 1; 536}; 537 538template <class _Tp> 539struct __has_iterator_concept 540{ 541private: 542 struct __two {char __lx; char __lxx;}; 543 template <class _Up> static __two __test(...); 544 template <class _Up> static char __test(typename _Up::iterator_concept* = nullptr); 545public: 546 static const bool value = sizeof(__test<_Tp>(nullptr)) == 1; 547}; 548 549template <class _Iter, bool> struct __iterator_traits_impl {}; 550 551template <class _Iter> 552struct __iterator_traits_impl<_Iter, true> 553{ 554 typedef typename _Iter::difference_type difference_type; 555 typedef typename _Iter::value_type value_type; 556 typedef typename _Iter::pointer pointer; 557 typedef typename _Iter::reference reference; 558 typedef typename _Iter::iterator_category iterator_category; 559}; 560 561#if !defined(_LIBCPP_HAS_NO_RANGES) 562 563// The `cpp17-*-iterator` exposition-only concepts are easily confused with the Cpp17*Iterator tables, 564// so they've been banished to a namespace that makes it obvious they have a niche use-case. 565namespace __iterator_traits_detail { 566template<class _Ip> 567concept __cpp17_iterator = 568 requires(_Ip __i) { 569 { *__i } -> __referenceable; 570 { ++__i } -> same_as<_Ip&>; 571 { *__i++ } -> __referenceable; 572 } && 573 copyable<_Ip>; 574 575template<class _Ip> 576concept __cpp17_input_iterator = 577 __cpp17_iterator<_Ip> && 578 equality_comparable<_Ip> && 579 requires(_Ip __i) { 580 typename incrementable_traits<_Ip>::difference_type; 581 typename indirectly_readable_traits<_Ip>::value_type; 582 typename common_reference_t<iter_reference_t<_Ip>&&, 583 typename indirectly_readable_traits<_Ip>::value_type&>; 584 typename common_reference_t<decltype(*__i++)&&, 585 typename indirectly_readable_traits<_Ip>::value_type&>; 586 requires signed_integral<typename incrementable_traits<_Ip>::difference_type>; 587 }; 588 589template<class _Ip> 590concept __cpp17_forward_iterator = 591 __cpp17_input_iterator<_Ip> && 592 constructible_from<_Ip> && 593 is_lvalue_reference_v<iter_reference_t<_Ip>> && 594 same_as<remove_cvref_t<iter_reference_t<_Ip>>, 595 typename indirectly_readable_traits<_Ip>::value_type> && 596 requires(_Ip __i) { 597 { __i++ } -> convertible_to<_Ip const&>; 598 { *__i++ } -> same_as<iter_reference_t<_Ip>>; 599 }; 600 601template<class _Ip> 602concept __cpp17_bidirectional_iterator = 603 __cpp17_forward_iterator<_Ip> && 604 requires(_Ip __i) { 605 { --__i } -> same_as<_Ip&>; 606 { __i-- } -> convertible_to<_Ip const&>; 607 { *__i-- } -> same_as<iter_reference_t<_Ip>>; 608 }; 609 610template<class _Ip> 611concept __cpp17_random_access_iterator = 612 __cpp17_bidirectional_iterator<_Ip> and 613 totally_ordered<_Ip> and 614 requires(_Ip __i, typename incrementable_traits<_Ip>::difference_type __n) { 615 { __i += __n } -> same_as<_Ip&>; 616 { __i -= __n } -> same_as<_Ip&>; 617 { __i + __n } -> same_as<_Ip>; 618 { __n + __i } -> same_as<_Ip>; 619 { __i - __n } -> same_as<_Ip>; 620 { __i - __i } -> same_as<decltype(__n)>; 621 { __i[__n] } -> convertible_to<iter_reference_t<_Ip>>; 622 }; 623} // namespace __iterator_traits_detail 624#endif // !defined(_LIBCPP_HAS_NO_RANGES) 625 626template <class _Iter, bool> struct __iterator_traits {}; 627 628template <class _Iter> 629struct __iterator_traits<_Iter, true> 630 : __iterator_traits_impl 631 < 632 _Iter, 633 is_convertible<typename _Iter::iterator_category, input_iterator_tag>::value || 634 is_convertible<typename _Iter::iterator_category, output_iterator_tag>::value 635 > 636{}; 637 638// iterator_traits<Iterator> will only have the nested types if Iterator::iterator_category 639// exists. Else iterator_traits<Iterator> will be an empty class. This is a 640// conforming extension which allows some programs to compile and behave as 641// the client expects instead of failing at compile time. 642 643template <class _Iter> 644struct _LIBCPP_TEMPLATE_VIS iterator_traits 645 : __iterator_traits<_Iter, __has_iterator_typedefs<_Iter>::value> { 646 647 using __primary_template = iterator_traits; 648}; 649 650template<class _Tp> 651struct _LIBCPP_TEMPLATE_VIS iterator_traits<_Tp*> 652{ 653 typedef ptrdiff_t difference_type; 654 typedef typename remove_cv<_Tp>::type value_type; 655 typedef _Tp* pointer; 656 typedef _Tp& reference; 657 typedef random_access_iterator_tag iterator_category; 658#if _LIBCPP_STD_VER > 17 659 typedef contiguous_iterator_tag iterator_concept; 660#endif 661}; 662 663template <class _Tp, class _Up, bool = __has_iterator_category<iterator_traits<_Tp> >::value> 664struct __has_iterator_category_convertible_to 665 : _BoolConstant<is_convertible<typename iterator_traits<_Tp>::iterator_category, _Up>::value> 666{}; 667 668template <class _Tp, class _Up> 669struct __has_iterator_category_convertible_to<_Tp, _Up, false> : false_type {}; 670 671template <class _Tp, class _Up, bool = __has_iterator_concept<_Tp>::value> 672struct __has_iterator_concept_convertible_to 673 : _BoolConstant<is_convertible<typename _Tp::iterator_concept, _Up>::value> 674{}; 675 676template <class _Tp, class _Up> 677struct __has_iterator_concept_convertible_to<_Tp, _Up, false> : false_type {}; 678 679template <class _Tp> 680struct __is_cpp17_input_iterator : public __has_iterator_category_convertible_to<_Tp, input_iterator_tag> {}; 681 682template <class _Tp> 683struct __is_cpp17_forward_iterator : public __has_iterator_category_convertible_to<_Tp, forward_iterator_tag> {}; 684 685template <class _Tp> 686struct __is_cpp17_bidirectional_iterator : public __has_iterator_category_convertible_to<_Tp, bidirectional_iterator_tag> {}; 687 688template <class _Tp> 689struct __is_cpp17_random_access_iterator : public __has_iterator_category_convertible_to<_Tp, random_access_iterator_tag> {}; 690 691// __is_cpp17_contiguous_iterator determines if an iterator is contiguous, 692// either because it advertises itself as such (in C++20) or because it 693// is a pointer type or a known trivial wrapper around a pointer type, 694// such as __wrap_iter<T*>. 695// 696#if _LIBCPP_STD_VER > 17 697template <class _Tp> 698struct __is_cpp17_contiguous_iterator : _Or< 699 __has_iterator_category_convertible_to<_Tp, contiguous_iterator_tag>, 700 __has_iterator_concept_convertible_to<_Tp, contiguous_iterator_tag> 701> {}; 702#else 703template <class _Tp> 704struct __is_cpp17_contiguous_iterator : false_type {}; 705#endif 706 707// Any native pointer which is an iterator is also a contiguous iterator. 708template <class _Up> 709struct __is_cpp17_contiguous_iterator<_Up*> : true_type {}; 710 711 712template <class _Tp> 713struct __is_exactly_cpp17_input_iterator 714 : public integral_constant<bool, 715 __has_iterator_category_convertible_to<_Tp, input_iterator_tag>::value && 716 !__has_iterator_category_convertible_to<_Tp, forward_iterator_tag>::value> {}; 717 718#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES 719template<class _InputIterator> 720using __iter_value_type = typename iterator_traits<_InputIterator>::value_type; 721 722template<class _InputIterator> 723using __iter_key_type = remove_const_t<typename iterator_traits<_InputIterator>::value_type::first_type>; 724 725template<class _InputIterator> 726using __iter_mapped_type = typename iterator_traits<_InputIterator>::value_type::second_type; 727 728template<class _InputIterator> 729using __iter_to_alloc_type = pair< 730 add_const_t<typename iterator_traits<_InputIterator>::value_type::first_type>, 731 typename iterator_traits<_InputIterator>::value_type::second_type>; 732#endif 733 734template<class _Category, class _Tp, class _Distance = ptrdiff_t, 735 class _Pointer = _Tp*, class _Reference = _Tp&> 736struct _LIBCPP_TEMPLATE_VIS iterator 737{ 738 typedef _Tp value_type; 739 typedef _Distance difference_type; 740 typedef _Pointer pointer; 741 typedef _Reference reference; 742 typedef _Category iterator_category; 743}; 744 745template <class _InputIter> 746inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 747void __advance(_InputIter& __i, 748 typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag) 749{ 750 for (; __n > 0; --__n) 751 ++__i; 752} 753 754template <class _BiDirIter> 755inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 756void __advance(_BiDirIter& __i, 757 typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag) 758{ 759 if (__n >= 0) 760 for (; __n > 0; --__n) 761 ++__i; 762 else 763 for (; __n < 0; ++__n) 764 --__i; 765} 766 767template <class _RandIter> 768inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 769void __advance(_RandIter& __i, 770 typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag) 771{ 772 __i += __n; 773} 774 775template <class _InputIter, class _Distance> 776inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 777void advance(_InputIter& __i, _Distance __orig_n) 778{ 779 _LIBCPP_ASSERT(__orig_n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 780 "Attempt to advance(it, n) with negative n on a non-bidirectional iterator"); 781 typedef decltype(_VSTD::__convert_to_integral(__orig_n)) _IntegralSize; 782 _IntegralSize __n = __orig_n; 783 _VSTD::__advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category()); 784} 785 786template <class _InputIter> 787inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 788typename iterator_traits<_InputIter>::difference_type 789__distance(_InputIter __first, _InputIter __last, input_iterator_tag) 790{ 791 typename iterator_traits<_InputIter>::difference_type __r(0); 792 for (; __first != __last; ++__first) 793 ++__r; 794 return __r; 795} 796 797template <class _RandIter> 798inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 799typename iterator_traits<_RandIter>::difference_type 800__distance(_RandIter __first, _RandIter __last, random_access_iterator_tag) 801{ 802 return __last - __first; 803} 804 805template <class _InputIter> 806inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 807typename iterator_traits<_InputIter>::difference_type 808distance(_InputIter __first, _InputIter __last) 809{ 810 return _VSTD::__distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category()); 811} 812 813template <class _InputIter> 814inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 815typename enable_if 816< 817 __is_cpp17_input_iterator<_InputIter>::value, 818 _InputIter 819>::type 820next(_InputIter __x, 821 typename iterator_traits<_InputIter>::difference_type __n = 1) 822{ 823 _LIBCPP_ASSERT(__n >= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 824 "Attempt to next(it, n) with negative n on a non-bidirectional iterator"); 825 826 _VSTD::advance(__x, __n); 827 return __x; 828} 829 830template <class _InputIter> 831inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 832typename enable_if 833< 834 __is_cpp17_input_iterator<_InputIter>::value, 835 _InputIter 836>::type 837prev(_InputIter __x, 838 typename iterator_traits<_InputIter>::difference_type __n = 1) 839{ 840 _LIBCPP_ASSERT(__n <= 0 || __is_cpp17_bidirectional_iterator<_InputIter>::value, 841 "Attempt to prev(it, n) with a positive n on a non-bidirectional iterator"); 842 _VSTD::advance(__x, -__n); 843 return __x; 844} 845 846 847template <class _Tp, class = void> 848struct __is_stashing_iterator : false_type {}; 849 850template <class _Tp> 851struct __is_stashing_iterator<_Tp, typename __void_t<typename _Tp::__stashing_iterator_tag>::type> 852 : true_type {}; 853 854template <class _Iter> 855class _LIBCPP_TEMPLATE_VIS reverse_iterator 856 : public iterator<typename iterator_traits<_Iter>::iterator_category, 857 typename iterator_traits<_Iter>::value_type, 858 typename iterator_traits<_Iter>::difference_type, 859 typename iterator_traits<_Iter>::pointer, 860 typename iterator_traits<_Iter>::reference> 861{ 862private: 863 /*mutable*/ _Iter __t; // no longer used as of LWG #2360, not removed due to ABI break 864 865 static_assert(!__is_stashing_iterator<_Iter>::value, 866 "The specified iterator type cannot be used with reverse_iterator; " 867 "Using stashing iterators with reverse_iterator causes undefined behavior"); 868 869protected: 870 _Iter current; 871public: 872 typedef _Iter iterator_type; 873 typedef typename iterator_traits<_Iter>::difference_type difference_type; 874 typedef typename iterator_traits<_Iter>::reference reference; 875 typedef typename iterator_traits<_Iter>::pointer pointer; 876 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 877 random_access_iterator_tag, 878 typename iterator_traits<_Iter>::iterator_category> iterator_category; 879#if _LIBCPP_STD_VER > 17 880 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 881 random_access_iterator_tag, 882 bidirectional_iterator_tag> iterator_concept; 883#endif 884 885 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 886 reverse_iterator() : __t(), current() {} 887 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 888 explicit reverse_iterator(_Iter __x) : __t(__x), current(__x) {} 889 template <class _Up> 890 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 891 reverse_iterator(const reverse_iterator<_Up>& __u) : __t(__u.base()), current(__u.base()) {} 892 template <class _Up> 893 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 894 reverse_iterator& operator=(const reverse_iterator<_Up>& __u) 895 { __t = current = __u.base(); return *this; } 896 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 897 _Iter base() const {return current;} 898 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 899 reference operator*() const {_Iter __tmp = current; return *--__tmp;} 900 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 901 pointer operator->() const {return _VSTD::addressof(operator*());} 902 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 903 reverse_iterator& operator++() {--current; return *this;} 904 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 905 reverse_iterator operator++(int) {reverse_iterator __tmp(*this); --current; return __tmp;} 906 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 907 reverse_iterator& operator--() {++current; return *this;} 908 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 909 reverse_iterator operator--(int) {reverse_iterator __tmp(*this); ++current; return __tmp;} 910 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 911 reverse_iterator operator+ (difference_type __n) const {return reverse_iterator(current - __n);} 912 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 913 reverse_iterator& operator+=(difference_type __n) {current -= __n; return *this;} 914 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 915 reverse_iterator operator- (difference_type __n) const {return reverse_iterator(current + __n);} 916 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 917 reverse_iterator& operator-=(difference_type __n) {current += __n; return *this;} 918 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 919 reference operator[](difference_type __n) const {return *(*this + __n);} 920}; 921 922template <class _Iter1, class _Iter2> 923inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 924bool 925operator==(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 926{ 927 return __x.base() == __y.base(); 928} 929 930template <class _Iter1, class _Iter2> 931inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 932bool 933operator<(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 934{ 935 return __x.base() > __y.base(); 936} 937 938template <class _Iter1, class _Iter2> 939inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 940bool 941operator!=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 942{ 943 return __x.base() != __y.base(); 944} 945 946template <class _Iter1, class _Iter2> 947inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 948bool 949operator>(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 950{ 951 return __x.base() < __y.base(); 952} 953 954template <class _Iter1, class _Iter2> 955inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 956bool 957operator>=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 958{ 959 return __x.base() <= __y.base(); 960} 961 962template <class _Iter1, class _Iter2> 963inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 964bool 965operator<=(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 966{ 967 return __x.base() >= __y.base(); 968} 969 970#ifndef _LIBCPP_CXX03_LANG 971template <class _Iter1, class _Iter2> 972inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 973auto 974operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 975-> decltype(__y.base() - __x.base()) 976{ 977 return __y.base() - __x.base(); 978} 979#else 980template <class _Iter1, class _Iter2> 981inline _LIBCPP_INLINE_VISIBILITY 982typename reverse_iterator<_Iter1>::difference_type 983operator-(const reverse_iterator<_Iter1>& __x, const reverse_iterator<_Iter2>& __y) 984{ 985 return __y.base() - __x.base(); 986} 987#endif 988 989template <class _Iter> 990inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 991reverse_iterator<_Iter> 992operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_iterator<_Iter>& __x) 993{ 994 return reverse_iterator<_Iter>(__x.base() - __n); 995} 996 997#if _LIBCPP_STD_VER > 11 998template <class _Iter> 999inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1000reverse_iterator<_Iter> make_reverse_iterator(_Iter __i) 1001{ 1002 return reverse_iterator<_Iter>(__i); 1003} 1004#endif 1005 1006template <class _Container> 1007class _LIBCPP_TEMPLATE_VIS back_insert_iterator 1008 : public iterator<output_iterator_tag, 1009 void, 1010 void, 1011 void, 1012 void> 1013{ 1014protected: 1015 _Container* container; 1016public: 1017 typedef _Container container_type; 1018 1019 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 explicit back_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {} 1020 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator=(const typename _Container::value_type& __value_) 1021 {container->push_back(__value_); return *this;} 1022#ifndef _LIBCPP_CXX03_LANG 1023 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator=(typename _Container::value_type&& __value_) 1024 {container->push_back(_VSTD::move(__value_)); return *this;} 1025#endif // _LIBCPP_CXX03_LANG 1026 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator*() {return *this;} 1027 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator& operator++() {return *this;} 1028 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 back_insert_iterator operator++(int) {return *this;} 1029}; 1030 1031template <class _Container> 1032inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1033back_insert_iterator<_Container> 1034back_inserter(_Container& __x) 1035{ 1036 return back_insert_iterator<_Container>(__x); 1037} 1038 1039template <class _Container> 1040class _LIBCPP_TEMPLATE_VIS front_insert_iterator 1041 : public iterator<output_iterator_tag, 1042 void, 1043 void, 1044 void, 1045 void> 1046{ 1047protected: 1048 _Container* container; 1049public: 1050 typedef _Container container_type; 1051 1052 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 explicit front_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {} 1053 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator=(const typename _Container::value_type& __value_) 1054 {container->push_front(__value_); return *this;} 1055#ifndef _LIBCPP_CXX03_LANG 1056 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator=(typename _Container::value_type&& __value_) 1057 {container->push_front(_VSTD::move(__value_)); return *this;} 1058#endif // _LIBCPP_CXX03_LANG 1059 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator*() {return *this;} 1060 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator++() {return *this;} 1061 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator operator++(int) {return *this;} 1062}; 1063 1064template <class _Container> 1065inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1066front_insert_iterator<_Container> 1067front_inserter(_Container& __x) 1068{ 1069 return front_insert_iterator<_Container>(__x); 1070} 1071 1072template <class _Container> 1073class _LIBCPP_TEMPLATE_VIS insert_iterator 1074 : public iterator<output_iterator_tag, 1075 void, 1076 void, 1077 void, 1078 void> 1079{ 1080protected: 1081 _Container* container; 1082 typename _Container::iterator iter; 1083public: 1084 typedef _Container container_type; 1085 1086 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator(_Container& __x, typename _Container::iterator __i) 1087 : container(_VSTD::addressof(__x)), iter(__i) {} 1088 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(const typename _Container::value_type& __value_) 1089 {iter = container->insert(iter, __value_); ++iter; return *this;} 1090#ifndef _LIBCPP_CXX03_LANG 1091 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(typename _Container::value_type&& __value_) 1092 {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;} 1093#endif // _LIBCPP_CXX03_LANG 1094 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator*() {return *this;} 1095 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++() {return *this;} 1096 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++(int) {return *this;} 1097}; 1098 1099template <class _Container> 1100inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1101insert_iterator<_Container> 1102inserter(_Container& __x, typename _Container::iterator __i) 1103{ 1104 return insert_iterator<_Container>(__x, __i); 1105} 1106 1107template <class _Tp, class _CharT = char, 1108 class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t> 1109class _LIBCPP_TEMPLATE_VIS istream_iterator 1110 : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&> 1111{ 1112public: 1113 typedef _CharT char_type; 1114 typedef _Traits traits_type; 1115 typedef basic_istream<_CharT,_Traits> istream_type; 1116private: 1117 istream_type* __in_stream_; 1118 _Tp __value_; 1119public: 1120 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {} 1121 _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s)) 1122 { 1123 if (!(*__in_stream_ >> __value_)) 1124 __in_stream_ = nullptr; 1125 } 1126 1127 _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;} 1128 _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));} 1129 _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++() 1130 { 1131 if (!(*__in_stream_ >> __value_)) 1132 __in_stream_ = nullptr; 1133 return *this; 1134 } 1135 _LIBCPP_INLINE_VISIBILITY istream_iterator operator++(int) 1136 {istream_iterator __t(*this); ++(*this); return __t;} 1137 1138 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 1139 friend _LIBCPP_INLINE_VISIBILITY 1140 bool 1141 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 1142 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 1143 1144 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 1145 friend _LIBCPP_INLINE_VISIBILITY 1146 bool 1147 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 1148 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 1149}; 1150 1151template <class _Tp, class _CharT, class _Traits, class _Distance> 1152inline _LIBCPP_INLINE_VISIBILITY 1153bool 1154operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 1155 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 1156{ 1157 return __x.__in_stream_ == __y.__in_stream_; 1158} 1159 1160template <class _Tp, class _CharT, class _Traits, class _Distance> 1161inline _LIBCPP_INLINE_VISIBILITY 1162bool 1163operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 1164 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 1165{ 1166 return !(__x == __y); 1167} 1168 1169template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT> > 1170class _LIBCPP_TEMPLATE_VIS ostream_iterator 1171 : public iterator<output_iterator_tag, void, void, void, void> 1172{ 1173public: 1174 typedef output_iterator_tag iterator_category; 1175 typedef void value_type; 1176#if _LIBCPP_STD_VER > 17 1177 typedef std::ptrdiff_t difference_type; 1178#else 1179 typedef void difference_type; 1180#endif 1181 typedef void pointer; 1182 typedef void reference; 1183 typedef _CharT char_type; 1184 typedef _Traits traits_type; 1185 typedef basic_ostream<_CharT, _Traits> ostream_type; 1186 1187private: 1188 ostream_type* __out_stream_; 1189 const char_type* __delim_; 1190public: 1191 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s) _NOEXCEPT 1192 : __out_stream_(_VSTD::addressof(__s)), __delim_(nullptr) {} 1193 _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter) _NOEXCEPT 1194 : __out_stream_(_VSTD::addressof(__s)), __delim_(__delimiter) {} 1195 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator=(const _Tp& __value_) 1196 { 1197 *__out_stream_ << __value_; 1198 if (__delim_) 1199 *__out_stream_ << __delim_; 1200 return *this; 1201 } 1202 1203 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator*() {return *this;} 1204 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++() {return *this;} 1205 _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator++(int) {return *this;} 1206}; 1207 1208template<class _CharT, class _Traits> 1209class _LIBCPP_TEMPLATE_VIS istreambuf_iterator 1210 : public iterator<input_iterator_tag, _CharT, 1211 typename _Traits::off_type, _CharT*, 1212 _CharT> 1213{ 1214public: 1215 typedef _CharT char_type; 1216 typedef _Traits traits_type; 1217 typedef typename _Traits::int_type int_type; 1218 typedef basic_streambuf<_CharT,_Traits> streambuf_type; 1219 typedef basic_istream<_CharT,_Traits> istream_type; 1220private: 1221 mutable streambuf_type* __sbuf_; 1222 1223 class __proxy 1224 { 1225 char_type __keep_; 1226 streambuf_type* __sbuf_; 1227 _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s) 1228 : __keep_(__c), __sbuf_(__s) {} 1229 friend class istreambuf_iterator; 1230 public: 1231 _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;} 1232 }; 1233 1234 _LIBCPP_INLINE_VISIBILITY 1235 bool __test_for_eof() const 1236 { 1237 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof())) 1238 __sbuf_ = nullptr; 1239 return __sbuf_ == nullptr; 1240 } 1241public: 1242 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {} 1243 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT 1244 : __sbuf_(__s.rdbuf()) {} 1245 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT 1246 : __sbuf_(__s) {} 1247 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT 1248 : __sbuf_(__p.__sbuf_) {} 1249 1250 _LIBCPP_INLINE_VISIBILITY char_type operator*() const 1251 {return static_cast<char_type>(__sbuf_->sgetc());} 1252 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++() 1253 { 1254 __sbuf_->sbumpc(); 1255 return *this; 1256 } 1257 _LIBCPP_INLINE_VISIBILITY __proxy operator++(int) 1258 { 1259 return __proxy(__sbuf_->sbumpc(), __sbuf_); 1260 } 1261 1262 _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const 1263 {return __test_for_eof() == __b.__test_for_eof();} 1264}; 1265 1266template <class _CharT, class _Traits> 1267inline _LIBCPP_INLINE_VISIBILITY 1268bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a, 1269 const istreambuf_iterator<_CharT,_Traits>& __b) 1270 {return __a.equal(__b);} 1271 1272template <class _CharT, class _Traits> 1273inline _LIBCPP_INLINE_VISIBILITY 1274bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a, 1275 const istreambuf_iterator<_CharT,_Traits>& __b) 1276 {return !__a.equal(__b);} 1277 1278template <class _CharT, class _Traits> 1279class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator 1280 : public iterator<output_iterator_tag, void, void, void, void> 1281{ 1282public: 1283 typedef output_iterator_tag iterator_category; 1284 typedef void value_type; 1285#if _LIBCPP_STD_VER > 17 1286 typedef std::ptrdiff_t difference_type; 1287#else 1288 typedef void difference_type; 1289#endif 1290 typedef void pointer; 1291 typedef void reference; 1292 typedef _CharT char_type; 1293 typedef _Traits traits_type; 1294 typedef basic_streambuf<_CharT, _Traits> streambuf_type; 1295 typedef basic_ostream<_CharT, _Traits> ostream_type; 1296 1297private: 1298 streambuf_type* __sbuf_; 1299public: 1300 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) _NOEXCEPT 1301 : __sbuf_(__s.rdbuf()) {} 1302 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT 1303 : __sbuf_(__s) {} 1304 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c) 1305 { 1306 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof())) 1307 __sbuf_ = nullptr; 1308 return *this; 1309 } 1310 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*() {return *this;} 1311 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++() {return *this;} 1312 _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;} 1313 _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == nullptr;} 1314 1315 template <class _Ch, class _Tr> 1316 friend 1317 _LIBCPP_HIDDEN 1318 ostreambuf_iterator<_Ch, _Tr> 1319 __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s, 1320 const _Ch* __ob, const _Ch* __op, const _Ch* __oe, 1321 ios_base& __iob, _Ch __fl); 1322}; 1323 1324template <class _Iter> 1325class _LIBCPP_TEMPLATE_VIS move_iterator 1326{ 1327private: 1328 _Iter __i; 1329public: 1330 typedef _Iter iterator_type; 1331 typedef typename iterator_traits<iterator_type>::value_type value_type; 1332 typedef typename iterator_traits<iterator_type>::difference_type difference_type; 1333 typedef iterator_type pointer; 1334 typedef _If<__is_cpp17_random_access_iterator<_Iter>::value, 1335 random_access_iterator_tag, 1336 typename iterator_traits<_Iter>::iterator_category> iterator_category; 1337#if _LIBCPP_STD_VER > 17 1338 typedef input_iterator_tag iterator_concept; 1339#endif 1340 1341#ifndef _LIBCPP_CXX03_LANG 1342 typedef typename iterator_traits<iterator_type>::reference __reference; 1343 typedef typename conditional< 1344 is_reference<__reference>::value, 1345 typename remove_reference<__reference>::type&&, 1346 __reference 1347 >::type reference; 1348#else 1349 typedef typename iterator_traits<iterator_type>::reference reference; 1350#endif 1351 1352 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1353 move_iterator() : __i() {} 1354 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1355 explicit move_iterator(_Iter __x) : __i(__x) {} 1356 template <class _Up> 1357 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1358 move_iterator(const move_iterator<_Up>& __u) : __i(__u.base()) {} 1359 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 _Iter base() const {return __i;} 1360 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1361 reference operator*() const { return static_cast<reference>(*__i); } 1362 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1363 pointer operator->() const { return __i;} 1364 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1365 move_iterator& operator++() {++__i; return *this;} 1366 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1367 move_iterator operator++(int) {move_iterator __tmp(*this); ++__i; return __tmp;} 1368 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1369 move_iterator& operator--() {--__i; return *this;} 1370 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1371 move_iterator operator--(int) {move_iterator __tmp(*this); --__i; return __tmp;} 1372 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1373 move_iterator operator+ (difference_type __n) const {return move_iterator(__i + __n);} 1374 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1375 move_iterator& operator+=(difference_type __n) {__i += __n; return *this;} 1376 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1377 move_iterator operator- (difference_type __n) const {return move_iterator(__i - __n);} 1378 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1379 move_iterator& operator-=(difference_type __n) {__i -= __n; return *this;} 1380 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1381 reference operator[](difference_type __n) const { return static_cast<reference>(__i[__n]); } 1382}; 1383 1384template <class _Iter1, class _Iter2> 1385inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1386bool 1387operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1388{ 1389 return __x.base() == __y.base(); 1390} 1391 1392template <class _Iter1, class _Iter2> 1393inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1394bool 1395operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1396{ 1397 return __x.base() < __y.base(); 1398} 1399 1400template <class _Iter1, class _Iter2> 1401inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1402bool 1403operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1404{ 1405 return __x.base() != __y.base(); 1406} 1407 1408template <class _Iter1, class _Iter2> 1409inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1410bool 1411operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1412{ 1413 return __x.base() > __y.base(); 1414} 1415 1416template <class _Iter1, class _Iter2> 1417inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1418bool 1419operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1420{ 1421 return __x.base() >= __y.base(); 1422} 1423 1424template <class _Iter1, class _Iter2> 1425inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1426bool 1427operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1428{ 1429 return __x.base() <= __y.base(); 1430} 1431 1432#ifndef _LIBCPP_CXX03_LANG 1433template <class _Iter1, class _Iter2> 1434inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1435auto 1436operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1437-> decltype(__x.base() - __y.base()) 1438{ 1439 return __x.base() - __y.base(); 1440} 1441#else 1442template <class _Iter1, class _Iter2> 1443inline _LIBCPP_INLINE_VISIBILITY 1444typename move_iterator<_Iter1>::difference_type 1445operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) 1446{ 1447 return __x.base() - __y.base(); 1448} 1449#endif 1450 1451template <class _Iter> 1452inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1453move_iterator<_Iter> 1454operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x) 1455{ 1456 return move_iterator<_Iter>(__x.base() + __n); 1457} 1458 1459template <class _Iter> 1460inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1461move_iterator<_Iter> 1462make_move_iterator(_Iter __i) 1463{ 1464 return move_iterator<_Iter>(__i); 1465} 1466 1467// __wrap_iter 1468 1469template <class _Iter> class __wrap_iter; 1470 1471template <class _Iter1, class _Iter2> 1472_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1473bool 1474operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1475 1476template <class _Iter1, class _Iter2> 1477_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1478bool 1479operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1480 1481template <class _Iter1, class _Iter2> 1482_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1483bool 1484operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1485 1486template <class _Iter1, class _Iter2> 1487_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1488bool 1489operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1490 1491template <class _Iter1, class _Iter2> 1492_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1493bool 1494operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1495 1496template <class _Iter1, class _Iter2> 1497_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1498bool 1499operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1500 1501#ifndef _LIBCPP_CXX03_LANG 1502template <class _Iter1, class _Iter2> 1503_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1504auto 1505operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1506-> decltype(__x.base() - __y.base()); 1507#else 1508template <class _Iter1, class _Iter2> 1509_LIBCPP_INLINE_VISIBILITY 1510typename __wrap_iter<_Iter1>::difference_type 1511operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1512#endif 1513 1514template <class _Iter> 1515_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1516__wrap_iter<_Iter> 1517operator+(typename __wrap_iter<_Iter>::difference_type, __wrap_iter<_Iter>) _NOEXCEPT; 1518 1519template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 copy(_Ip, _Ip, _Op); 1520template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 copy_backward(_B1, _B1, _B2); 1521template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 move(_Ip, _Ip, _Op); 1522template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 move_backward(_B1, _B1, _B2); 1523 1524template <class _Iter> 1525class __wrap_iter 1526{ 1527public: 1528 typedef _Iter iterator_type; 1529 typedef typename iterator_traits<iterator_type>::value_type value_type; 1530 typedef typename iterator_traits<iterator_type>::difference_type difference_type; 1531 typedef typename iterator_traits<iterator_type>::pointer pointer; 1532 typedef typename iterator_traits<iterator_type>::reference reference; 1533 typedef typename iterator_traits<iterator_type>::iterator_category iterator_category; 1534#if _LIBCPP_STD_VER > 17 1535 typedef _If<__is_cpp17_contiguous_iterator<_Iter>::value, 1536 contiguous_iterator_tag, iterator_category> iterator_concept; 1537#endif 1538 1539private: 1540 iterator_type __i; 1541public: 1542 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter() _NOEXCEPT 1543#if _LIBCPP_STD_VER > 11 1544 : __i{} 1545#endif 1546 { 1547#if _LIBCPP_DEBUG_LEVEL == 2 1548 __get_db()->__insert_i(this); 1549#endif 1550 } 1551 template <class _Up> _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1552 __wrap_iter(const __wrap_iter<_Up>& __u, 1553 typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = nullptr) _NOEXCEPT 1554 : __i(__u.base()) 1555 { 1556#if _LIBCPP_DEBUG_LEVEL == 2 1557 __get_db()->__iterator_copy(this, &__u); 1558#endif 1559 } 1560#if _LIBCPP_DEBUG_LEVEL == 2 1561 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1562 __wrap_iter(const __wrap_iter& __x) 1563 : __i(__x.base()) 1564 { 1565 __get_db()->__iterator_copy(this, &__x); 1566 } 1567 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1568 __wrap_iter& operator=(const __wrap_iter& __x) 1569 { 1570 if (this != &__x) 1571 { 1572 __get_db()->__iterator_copy(this, &__x); 1573 __i = __x.__i; 1574 } 1575 return *this; 1576 } 1577 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1578 ~__wrap_iter() 1579 { 1580 __get_db()->__erase_i(this); 1581 } 1582#endif 1583 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator*() const _NOEXCEPT 1584 { 1585#if _LIBCPP_DEBUG_LEVEL == 2 1586 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1587 "Attempted to dereference a non-dereferenceable iterator"); 1588#endif 1589 return *__i; 1590 } 1591 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG pointer operator->() const _NOEXCEPT 1592 { 1593#if _LIBCPP_DEBUG_LEVEL == 2 1594 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1595 "Attempted to dereference a non-dereferenceable iterator"); 1596#endif 1597 return (pointer)_VSTD::addressof(*__i); 1598 } 1599 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator++() _NOEXCEPT 1600 { 1601#if _LIBCPP_DEBUG_LEVEL == 2 1602 _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this), 1603 "Attempted to increment non-incrementable iterator"); 1604#endif 1605 ++__i; 1606 return *this; 1607 } 1608 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator++(int) _NOEXCEPT 1609 {__wrap_iter __tmp(*this); ++(*this); return __tmp;} 1610 1611 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator--() _NOEXCEPT 1612 { 1613#if _LIBCPP_DEBUG_LEVEL == 2 1614 _LIBCPP_ASSERT(__get_const_db()->__decrementable(this), 1615 "Attempted to decrement non-decrementable iterator"); 1616#endif 1617 --__i; 1618 return *this; 1619 } 1620 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator--(int) _NOEXCEPT 1621 {__wrap_iter __tmp(*this); --(*this); return __tmp;} 1622 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator+ (difference_type __n) const _NOEXCEPT 1623 {__wrap_iter __w(*this); __w += __n; return __w;} 1624 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator+=(difference_type __n) _NOEXCEPT 1625 { 1626#if _LIBCPP_DEBUG_LEVEL == 2 1627 _LIBCPP_ASSERT(__get_const_db()->__addable(this, __n), 1628 "Attempted to add/subtract iterator outside of valid range"); 1629#endif 1630 __i += __n; 1631 return *this; 1632 } 1633 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter operator- (difference_type __n) const _NOEXCEPT 1634 {return *this + (-__n);} 1635 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator-=(difference_type __n) _NOEXCEPT 1636 {*this += -__n; return *this;} 1637 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator[](difference_type __n) const _NOEXCEPT 1638 { 1639#if _LIBCPP_DEBUG_LEVEL == 2 1640 _LIBCPP_ASSERT(__get_const_db()->__subscriptable(this, __n), 1641 "Attempted to subscript iterator outside of valid range"); 1642#endif 1643 return __i[__n]; 1644 } 1645 1646 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG iterator_type base() const _NOEXCEPT {return __i;} 1647 1648private: 1649#if _LIBCPP_DEBUG_LEVEL == 2 1650 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(const void* __p, iterator_type __x) : __i(__x) 1651 { 1652 __get_db()->__insert_ic(this, __p); 1653 } 1654#else 1655 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {} 1656#endif 1657 1658 template <class _Up> friend class __wrap_iter; 1659 template <class _CharT, class _Traits, class _Alloc> friend class basic_string; 1660 template <class _Tp, class _Alloc> friend class _LIBCPP_TEMPLATE_VIS vector; 1661 template <class _Tp, size_t> friend class _LIBCPP_TEMPLATE_VIS span; 1662 1663 template <class _Iter1, class _Iter2> 1664 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1665 bool 1666 operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1667 1668 template <class _Iter1, class _Iter2> 1669 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1670 bool 1671 operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1672 1673 template <class _Iter1, class _Iter2> 1674 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1675 bool 1676 operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1677 1678 template <class _Iter1, class _Iter2> 1679 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1680 bool 1681 operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1682 1683 template <class _Iter1, class _Iter2> 1684 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1685 bool 1686 operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1687 1688 template <class _Iter1, class _Iter2> 1689 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1690 bool 1691 operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1692 1693#ifndef _LIBCPP_CXX03_LANG 1694 template <class _Iter1, class _Iter2> 1695 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1696 auto 1697 operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1698 -> decltype(__x.base() - __y.base()); 1699#else 1700 template <class _Iter1, class _Iter2> 1701 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1702 typename __wrap_iter<_Iter1>::difference_type 1703 operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT; 1704#endif 1705 1706 template <class _Iter1> 1707 _LIBCPP_CONSTEXPR_IF_NODEBUG friend 1708 __wrap_iter<_Iter1> 1709 operator+(typename __wrap_iter<_Iter1>::difference_type, __wrap_iter<_Iter1>) _NOEXCEPT; 1710 1711 template <class _Ip, class _Op> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _Op copy(_Ip, _Ip, _Op); 1712 template <class _B1, class _B2> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _B2 copy_backward(_B1, _B1, _B2); 1713 template <class _Ip, class _Op> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _Op move(_Ip, _Ip, _Op); 1714 template <class _B1, class _B2> friend _LIBCPP_CONSTEXPR_AFTER_CXX17 _B2 move_backward(_B1, _B1, _B2); 1715}; 1716 1717#if _LIBCPP_STD_VER <= 17 1718template <class _It> 1719struct __is_cpp17_contiguous_iterator<__wrap_iter<_It> > : __is_cpp17_contiguous_iterator<_It> {}; 1720#endif 1721 1722template <class _Iter> 1723_LIBCPP_CONSTEXPR 1724_EnableIf<__is_cpp17_contiguous_iterator<_Iter>::value, decltype(_VSTD::__to_address(declval<_Iter>()))> 1725__to_address(__wrap_iter<_Iter> __w) _NOEXCEPT { 1726 return _VSTD::__to_address(__w.base()); 1727} 1728 1729template <class _Iter1, class _Iter2> 1730inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1731bool 1732operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1733{ 1734 return __x.base() == __y.base(); 1735} 1736 1737template <class _Iter1, class _Iter2> 1738inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1739bool 1740operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1741{ 1742#if _LIBCPP_DEBUG_LEVEL == 2 1743 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1744 "Attempted to compare incomparable iterators"); 1745#endif 1746 return __x.base() < __y.base(); 1747} 1748 1749template <class _Iter1, class _Iter2> 1750inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1751bool 1752operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1753{ 1754 return !(__x == __y); 1755} 1756 1757template <class _Iter1, class _Iter2> 1758inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1759bool 1760operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1761{ 1762 return __y < __x; 1763} 1764 1765template <class _Iter1, class _Iter2> 1766inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1767bool 1768operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1769{ 1770 return !(__x < __y); 1771} 1772 1773template <class _Iter1, class _Iter2> 1774inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1775bool 1776operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1777{ 1778 return !(__y < __x); 1779} 1780 1781template <class _Iter1> 1782inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1783bool 1784operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1785{ 1786 return !(__x == __y); 1787} 1788 1789template <class _Iter1> 1790inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1791bool 1792operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1793{ 1794 return __y < __x; 1795} 1796 1797template <class _Iter1> 1798inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1799bool 1800operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1801{ 1802 return !(__x < __y); 1803} 1804 1805template <class _Iter1> 1806inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1807bool 1808operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT 1809{ 1810 return !(__y < __x); 1811} 1812 1813#ifndef _LIBCPP_CXX03_LANG 1814template <class _Iter1, class _Iter2> 1815inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1816auto 1817operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1818-> decltype(__x.base() - __y.base()) 1819{ 1820#if _LIBCPP_DEBUG_LEVEL == 2 1821 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1822 "Attempted to subtract incompatible iterators"); 1823#endif 1824 return __x.base() - __y.base(); 1825} 1826#else 1827template <class _Iter1, class _Iter2> 1828inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1829typename __wrap_iter<_Iter1>::difference_type 1830operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT 1831{ 1832#if _LIBCPP_DEBUG_LEVEL == 2 1833 _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y), 1834 "Attempted to subtract incompatible iterators"); 1835#endif 1836 return __x.base() - __y.base(); 1837} 1838#endif 1839 1840template <class _Iter> 1841inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG 1842__wrap_iter<_Iter> 1843operator+(typename __wrap_iter<_Iter>::difference_type __n, 1844 __wrap_iter<_Iter> __x) _NOEXCEPT 1845{ 1846 __x += __n; 1847 return __x; 1848} 1849 1850template <class _Iter> 1851struct __libcpp_is_trivial_iterator 1852 : public _LIBCPP_BOOL_CONSTANT(is_pointer<_Iter>::value) {}; 1853 1854template <class _Iter> 1855struct __libcpp_is_trivial_iterator<move_iterator<_Iter> > 1856 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {}; 1857 1858template <class _Iter> 1859struct __libcpp_is_trivial_iterator<reverse_iterator<_Iter> > 1860 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {}; 1861 1862template <class _Iter> 1863struct __libcpp_is_trivial_iterator<__wrap_iter<_Iter> > 1864 : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {}; 1865 1866 1867template <class _Tp, size_t _Np> 1868_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1869_Tp* 1870begin(_Tp (&__array)[_Np]) 1871{ 1872 return __array; 1873} 1874 1875template <class _Tp, size_t _Np> 1876_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1877_Tp* 1878end(_Tp (&__array)[_Np]) 1879{ 1880 return __array + _Np; 1881} 1882 1883#if !defined(_LIBCPP_CXX03_LANG) 1884 1885template <class _Cp> 1886_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1887auto 1888begin(_Cp& __c) -> decltype(__c.begin()) 1889{ 1890 return __c.begin(); 1891} 1892 1893template <class _Cp> 1894_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1895auto 1896begin(const _Cp& __c) -> decltype(__c.begin()) 1897{ 1898 return __c.begin(); 1899} 1900 1901template <class _Cp> 1902_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1903auto 1904end(_Cp& __c) -> decltype(__c.end()) 1905{ 1906 return __c.end(); 1907} 1908 1909template <class _Cp> 1910_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1911auto 1912end(const _Cp& __c) -> decltype(__c.end()) 1913{ 1914 return __c.end(); 1915} 1916 1917#if _LIBCPP_STD_VER > 11 1918 1919template <class _Tp, size_t _Np> 1920_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1921reverse_iterator<_Tp*> rbegin(_Tp (&__array)[_Np]) 1922{ 1923 return reverse_iterator<_Tp*>(__array + _Np); 1924} 1925 1926template <class _Tp, size_t _Np> 1927_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1928reverse_iterator<_Tp*> rend(_Tp (&__array)[_Np]) 1929{ 1930 return reverse_iterator<_Tp*>(__array); 1931} 1932 1933template <class _Ep> 1934_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1935reverse_iterator<const _Ep*> rbegin(initializer_list<_Ep> __il) 1936{ 1937 return reverse_iterator<const _Ep*>(__il.end()); 1938} 1939 1940template <class _Ep> 1941_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1942reverse_iterator<const _Ep*> rend(initializer_list<_Ep> __il) 1943{ 1944 return reverse_iterator<const _Ep*>(__il.begin()); 1945} 1946 1947template <class _Cp> 1948_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1949auto cbegin(const _Cp& __c) -> decltype(_VSTD::begin(__c)) 1950{ 1951 return _VSTD::begin(__c); 1952} 1953 1954template <class _Cp> 1955_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 1956auto cend(const _Cp& __c) -> decltype(_VSTD::end(__c)) 1957{ 1958 return _VSTD::end(__c); 1959} 1960 1961template <class _Cp> 1962_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1963auto rbegin(_Cp& __c) -> decltype(__c.rbegin()) 1964{ 1965 return __c.rbegin(); 1966} 1967 1968template <class _Cp> 1969_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1970auto rbegin(const _Cp& __c) -> decltype(__c.rbegin()) 1971{ 1972 return __c.rbegin(); 1973} 1974 1975template <class _Cp> 1976_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1977auto rend(_Cp& __c) -> decltype(__c.rend()) 1978{ 1979 return __c.rend(); 1980} 1981 1982template <class _Cp> 1983_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1984auto rend(const _Cp& __c) -> decltype(__c.rend()) 1985{ 1986 return __c.rend(); 1987} 1988 1989template <class _Cp> 1990_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1991auto crbegin(const _Cp& __c) -> decltype(_VSTD::rbegin(__c)) 1992{ 1993 return _VSTD::rbegin(__c); 1994} 1995 1996template <class _Cp> 1997_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 1998auto crend(const _Cp& __c) -> decltype(_VSTD::rend(__c)) 1999{ 2000 return _VSTD::rend(__c); 2001} 2002 2003#endif 2004 2005 2006#else // defined(_LIBCPP_CXX03_LANG) 2007 2008template <class _Cp> 2009_LIBCPP_INLINE_VISIBILITY 2010typename _Cp::iterator 2011begin(_Cp& __c) 2012{ 2013 return __c.begin(); 2014} 2015 2016template <class _Cp> 2017_LIBCPP_INLINE_VISIBILITY 2018typename _Cp::const_iterator 2019begin(const _Cp& __c) 2020{ 2021 return __c.begin(); 2022} 2023 2024template <class _Cp> 2025_LIBCPP_INLINE_VISIBILITY 2026typename _Cp::iterator 2027end(_Cp& __c) 2028{ 2029 return __c.end(); 2030} 2031 2032template <class _Cp> 2033_LIBCPP_INLINE_VISIBILITY 2034typename _Cp::const_iterator 2035end(const _Cp& __c) 2036{ 2037 return __c.end(); 2038} 2039 2040#endif // !defined(_LIBCPP_CXX03_LANG) 2041 2042#if _LIBCPP_STD_VER > 14 2043 2044// #if _LIBCPP_STD_VER > 11 2045// template <> 2046// struct _LIBCPP_TEMPLATE_VIS plus<void> 2047// { 2048// template <class _T1, class _T2> 2049// _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 2050// auto operator()(_T1&& __t, _T2&& __u) const 2051// _NOEXCEPT_(noexcept(_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u))) 2052// -> decltype (_VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u)) 2053// { return _VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u); } 2054// typedef void is_transparent; 2055// }; 2056// #endif 2057 2058template <class _Cont> 2059_LIBCPP_INLINE_VISIBILITY 2060constexpr auto size(const _Cont& __c) 2061_NOEXCEPT_(noexcept(__c.size())) 2062-> decltype (__c.size()) 2063{ return __c.size(); } 2064 2065template <class _Tp, size_t _Sz> 2066_LIBCPP_INLINE_VISIBILITY 2067constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; } 2068 2069#if _LIBCPP_STD_VER > 17 2070template <class _Cont> 2071_LIBCPP_INLINE_VISIBILITY 2072constexpr auto ssize(const _Cont& __c) 2073_NOEXCEPT_(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()))) 2074-> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>> 2075{ return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); } 2076 2077template <class _Tp, ptrdiff_t _Sz> 2078_LIBCPP_INLINE_VISIBILITY 2079constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { return _Sz; } 2080#endif 2081 2082template <class _Cont> 2083_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 2084constexpr auto empty(const _Cont& __c) 2085_NOEXCEPT_(noexcept(__c.empty())) 2086-> decltype (__c.empty()) 2087{ return __c.empty(); } 2088 2089template <class _Tp, size_t _Sz> 2090_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 2091constexpr bool empty(const _Tp (&)[_Sz]) noexcept { return false; } 2092 2093template <class _Ep> 2094_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 2095constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; } 2096 2097template <class _Cont> constexpr 2098_LIBCPP_INLINE_VISIBILITY 2099auto data(_Cont& __c) 2100_NOEXCEPT_(noexcept(__c.data())) 2101-> decltype (__c.data()) 2102{ return __c.data(); } 2103 2104template <class _Cont> constexpr 2105_LIBCPP_INLINE_VISIBILITY 2106auto data(const _Cont& __c) 2107_NOEXCEPT_(noexcept(__c.data())) 2108-> decltype (__c.data()) 2109{ return __c.data(); } 2110 2111template <class _Tp, size_t _Sz> 2112_LIBCPP_INLINE_VISIBILITY 2113constexpr _Tp* data(_Tp (&__array)[_Sz]) noexcept { return __array; } 2114 2115template <class _Ep> 2116_LIBCPP_INLINE_VISIBILITY 2117constexpr const _Ep* data(initializer_list<_Ep> __il) noexcept { return __il.begin(); } 2118#endif 2119 2120template <class _Container, class _Predicate> 2121typename _Container::size_type 2122__libcpp_erase_if_container(_Container& __c, _Predicate& __pred) { 2123 typename _Container::size_type __old_size = __c.size(); 2124 2125 const typename _Container::iterator __last = __c.end(); 2126 for (typename _Container::iterator __iter = __c.begin(); __iter != __last;) { 2127 if (__pred(*__iter)) 2128 __iter = __c.erase(__iter); 2129 else 2130 ++__iter; 2131 } 2132 2133 return __old_size - __c.size(); 2134} 2135 2136_LIBCPP_END_NAMESPACE_STD 2137 2138#endif // _LIBCPP_ITERATOR 2139