1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 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_RANGES 11#define _LIBCPP_RANGES 12 13/* 14 15#include <compare> // see [compare.syn] 16#include <initializer_list> // see [initializer.list.syn] 17#include <iterator> // see [iterator.synopsis] 18 19namespace std::ranges { 20 inline namespace unspecified { 21 // [range.access], range access 22 inline constexpr unspecified begin = unspecified; 23 inline constexpr unspecified end = unspecified; 24 inline constexpr unspecified cbegin = unspecified; 25 inline constexpr unspecified cend = unspecified; 26 27 inline constexpr unspecified size = unspecified; 28 inline constexpr unspecified ssize = unspecified; 29 } 30 31 // [range.range], ranges 32 template<class T> 33 concept range = see below; 34 35 template<class T> 36 inline constexpr bool enable_borrowed_range = false; 37 38 template<class T> 39 using iterator_t = decltype(ranges::begin(declval<T&>())); 40 template<range R> 41 using sentinel_t = decltype(ranges::end(declval<R&>())); 42 template<range R> 43 using range_difference_t = iter_difference_t<iterator_t<R>>; 44 template<sized_range R> 45 using range_size_t = decltype(ranges::size(declval<R&>())); 46 template<range R> 47 using range_value_t = iter_value_t<iterator_t<R>>; 48 template<range R> 49 using range_reference_t = iter_reference_t<iterator_t<R>>; 50 template<range R> 51 using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<R>>; 52 template <range R> 53 using range_common_reference_t = iter_common_reference_t<iterator_t<R>>; 54 55 // [range.sized], sized ranges 56 template<class> 57 inline constexpr bool disable_sized_range = false; 58 59 template<class T> 60 concept sized_range = ...; 61 62 // [range.view], views 63 template<class T> 64 inline constexpr bool enable_view = ...; 65 66 struct view_base { }; 67 68 template<class T> 69 concept view = ...; 70 71 // [range.refinements], other range refinements 72 template<class R, class T> 73 concept output_range = see below; 74 75 template<class T> 76 concept input_range = see below; 77 78 template<class T> 79 concept forward_range = see below; 80 81 template<class T> 82 concept bidirectional_range = see below; 83 84 template<class T> 85 concept random_access_range = see below; 86 87 template<class T> 88 concept contiguous_range = see below; 89 90 template <class _Tp> 91 concept common_range = see below; 92 93 template<class T> 94 concept viewable_range = see below; 95 96 // [view.interface], class template view_interface 97 template<class D> 98 requires is_class_v<D> && same_as<D, remove_cv_t<D>> 99 class view_interface; 100 101 // [range.subrange], sub-ranges 102 enum class subrange_kind : bool { unsized, sized }; 103 104 template<input_or_output_iterator I, sentinel_for<I> S = I, subrange_kind K = see below> 105 requires (K == subrange_kind::sized || !sized_sentinel_for<S, I>) 106 class subrange; 107 108 template<class I, class S, subrange_kind K> 109 inline constexpr bool enable_borrowed_range<subrange<I, S, K>> = true; 110 111 // [range.dangling], dangling iterator handling 112 struct dangling; 113 114 template<range R> 115 using borrowed_iterator_t = see below; 116 117 template<range R> 118 using borrowed_subrange_t = see below; 119 120 // [range.elements], elements view 121 template<input_range V, size_t N> 122 requires see below 123 class elements_view; 124 125 template<class T, size_t N> 126 inline constexpr bool enable_borrowed_range<elements_view<T, N>> = 127 enable_borrowed_range<T>; 128 129 template<class R> 130 using keys_view = elements_view<R, 0>; 131 template<class R> 132 using values_view = elements_view<R, 1>; 133 134 namespace views { 135 template<size_t N> 136 inline constexpr unspecified elements = unspecified; 137 inline constexpr auto keys = elements<0>; 138 inline constexpr auto values = elements<1>; 139 } 140 141 // [range.utility.conv], range conversions 142 template<class C, input_range R, class... Args> requires (!view<C>) 143 constexpr C to(R&& r, Args&&... args); // Since C++23 144 template<template<class...> class C, input_range R, class... Args> 145 constexpr auto to(R&& r, Args&&... args); // Since C++23 146 template<class C, class... Args> requires (!view<C>) 147 constexpr auto to(Args&&... args); // Since C++23 148 template<template<class...> class C, class... Args> 149 constexpr auto to(Args&&... args); // Since C++23 150 151 // [range.empty], empty view 152 template<class T> 153 requires is_object_v<T> 154 class empty_view; 155 156 template<class T> 157 inline constexpr bool enable_borrowed_range<empty_view<T>> = true; 158 159 namespace views { 160 template<class T> 161 inline constexpr empty_view<T> empty{}; 162 } 163 164 // [range.all], all view 165 namespace views { 166 inline constexpr unspecified all = unspecified; 167 168 template<viewable_range R> 169 using all_t = decltype(all(declval<R>())); 170 } 171 172 template<range R> 173 requires is_object_v<R> 174 class ref_view; 175 176 template<class T> 177 inline constexpr bool enable_borrowed_range<ref_view<T>> = true; 178 179 template<range R> 180 requires see below 181 class owning_view; 182 183 template<class T> 184 inline constexpr bool enable_borrowed_range<owning_view<T>> = enable_borrowed_range<T>; 185 186 // [range.filter], filter view 187 template<input_range V, indirect_unary_predicate<iterator_t<V>> Pred> 188 requires view<V> && is_object_v<Pred> 189 class filter_view; 190 191 namespace views { 192 inline constexpr unspecified filter = unspecified; 193 } 194 195 // [range.drop], drop view 196 template<view V> 197 class drop_view; 198 199 template<class T> 200 inline constexpr bool enable_borrowed_range<drop_view<T>> = enable_borrowed_range<T>; 201 202 // [range.drop.while], drop while view 203 template<view V, class Pred> 204 requires input_range<V> && is_object_v<Pred> && 205 indirect_unary_predicate<const Pred, iterator_t<V>> 206 class drop_while_view; 207 208 template<class T, class Pred> 209 inline constexpr bool enable_borrowed_range<drop_while_view<T, Pred>> = 210 enable_borrowed_range<T>; 211 212 namespace views { inline constexpr unspecified drop_while = unspecified; } 213 214 // [range.transform], transform view 215 template<input_range V, copy_constructible F> 216 requires view<V> && is_object_v<F> && 217 regular_invocable<F&, range_reference_t<V>> && 218 can-reference<invoke_result_t<F&, range_reference_t<V>>> 219 class transform_view; 220 221 // [range.counted], counted view 222 namespace views { inline constexpr unspecified counted = unspecified; } 223 224 // [range.common], common view 225 template<view V> 226 requires (!common_range<V> && copyable<iterator_t<V>>) 227 class common_view; 228 229 // [range.reverse], reverse view 230 template<view V> 231 requires bidirectional_range<V> 232 class reverse_view; 233 234 template<class T> 235 inline constexpr bool enable_borrowed_range<reverse_view<T>> = enable_borrowed_range<T>; 236 237 template<class T> 238 inline constexpr bool enable_borrowed_range<common_view<T>> = enable_borrowed_range<T>; 239 240 // [range.take], take view 241 template<view> class take_view; 242 243 template<class T> 244 inline constexpr bool enable_borrowed_range<take_view<T>> = enable_borrowed_range<T>; 245 246 // [range.take.while], take while view 247 template<view V, class Pred> 248 requires input_range<V> && is_object_v<Pred> && 249 indirect_unary_predicate<const Pred, iterator_t<V>> 250 class take_while_view; 251 252 namespace views { inline constexpr unspecified take_while = unspecified; } 253 254 template<copy_constructible T> 255 requires is_object_v<T> 256 class single_view; 257 258 template<weakly_incrementable W, semiregular Bound = unreachable_sentinel_t> 259 requires weakly-equality-comparable-with<W, Bound> && copyable<W> 260 class iota_view; 261 262 template<class W, class Bound> 263 inline constexpr bool enable_borrowed_range<iota_view<W, Bound>> = true; 264 265 // [range.repeat], repeat view 266 template<class T> 267 concept integer-like-with-usable-difference-type = // exposition only 268 is-signed-integer-like<T> || (is-integer-like<T> && weakly_incrementable<T>); 269 270 template<move_constructible T, semiregular Bound = unreachable_sentinel_t> 271 requires (is_object_v<T> && same_as<T, remove_cv_t<T>> && 272 (integer-like-with-usable-difference-type<Bound> || 273 same_as<Bound, unreachable_sentinel_t>)) 274 class repeat_view; 275 276 namespace views { inline constexpr unspecified repeat = unspecified; } 277 278 // [range.join], join view 279 template<input_range V> 280 requires view<V> && input_range<range_reference_t<V>> 281 class join_view; 282 283 // [range.lazy.split], lazy split view 284 template<class R> 285 concept tiny-range = see below; // exposition only 286 287 template<input_range V, forward_range Pattern> 288 requires view<V> && view<Pattern> && 289 indirectly_comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> && 290 (forward_range<V> || tiny-range<Pattern>) 291 class lazy_split_view; 292 293 // [range.split], split view 294 template<forward_range V, forward_range Pattern> 295 requires view<V> && view<Pattern> && 296 indirectly_comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> 297 class split_view; 298 299 namespace views { 300 inline constexpr unspecified lazy_split = unspecified; 301 inline constexpr unspecified split = unspecified; 302 } 303 304 // [range.istream], istream view 305 template<movable Val, class CharT, class Traits = char_traits<CharT>> 306 requires see below 307 class basic_istream_view; 308 309 template<class Val> 310 using istream_view = basic_istream_view<Val, char>; 311 312 template<class Val> 313 using wistream_view = basic_istream_view<Val, wchar_t>; 314 315 namespace views { template<class T> inline constexpr unspecified istream = unspecified; } 316 317 // [range.zip], zip view 318 template<input_range... Views> 319 requires (view<Views> && ...) && (sizeof...(Views) > 0) 320 class zip_view; // C++23 321 322 template<class... Views> 323 inline constexpr bool enable_borrowed_range<zip_view<Views...>> = // C++23 324 (enable_borrowed_range<Views> && ...); 325 326 namespace views { inline constexpr unspecified zip = unspecified; } // C++23 327 328 // [range.as.rvalue] 329 template <view V> 330 requires input_range<V> 331 class as_rvalue_view; // C++23 332 333 namespace views { inline constexpr unspecified as_rvalue ) unspecified; } // C++23 334 335 [range.chunk.by] 336 template<forward_range V, indirect_binary_predicate<iterator_t<V>, iterator_t<V>> Pred> 337 requires view<V> && is_object_v<Pred> 338 class chunk_by_view; // C++23 339 340 namespace views { inline constexpr unspecified chunk_by = unspecified; } // C++23 341} 342 343namespace std { 344 namespace views = ranges::views; 345 346 template<class T> struct tuple_size; 347 template<size_t I, class T> struct tuple_element; 348 349 template<class I, class S, ranges::subrange_kind K> 350 struct tuple_size<ranges::subrange<I, S, K>> 351 : integral_constant<size_t, 2> {}; 352 353 template<class I, class S, ranges::subrange_kind K> 354 struct tuple_element<0, ranges::subrange<I, S, K>> { 355 using type = I; 356 }; 357 358 template<class I, class S, ranges::subrange_kind K> 359 struct tuple_element<1, ranges::subrange<I, S, K>> { 360 using type = S; 361 }; 362 363 template<class I, class S, ranges::subrange_kind K> 364 struct tuple_element<0, const ranges::subrange<I, S, K>> { 365 using type = I; 366 }; 367 368 template<class I, class S, ranges::subrange_kind K> 369 struct tuple_element<1, const ranges::subrange<I, S, K>> { 370 using type = S; 371 }; 372 373 struct from_range_t { explicit from_range_t() = default; }; // Since C++23 374 inline constexpr from_range_t from_range{}; // Since C++23 375} 376*/ 377 378#include <__assert> // all public C++ headers provide the assertion handler 379#include <__config> 380#include <__ranges/access.h> 381#include <__ranges/all.h> 382#include <__ranges/as_rvalue_view.h> 383#include <__ranges/chunk_by_view.h> 384#include <__ranges/common_view.h> 385#include <__ranges/concepts.h> 386#include <__ranges/counted.h> 387#include <__ranges/dangling.h> 388#include <__ranges/data.h> 389#include <__ranges/drop_view.h> 390#include <__ranges/drop_while_view.h> 391#include <__ranges/elements_view.h> 392#include <__ranges/empty.h> 393#include <__ranges/empty_view.h> 394#include <__ranges/enable_borrowed_range.h> 395#include <__ranges/enable_view.h> 396#include <__ranges/filter_view.h> 397#include <__ranges/from_range.h> 398#include <__ranges/iota_view.h> 399#include <__ranges/join_view.h> 400#include <__ranges/lazy_split_view.h> 401#include <__ranges/rbegin.h> 402#include <__ranges/ref_view.h> 403#include <__ranges/rend.h> 404#include <__ranges/repeat_view.h> 405#include <__ranges/reverse_view.h> 406#include <__ranges/single_view.h> 407#include <__ranges/size.h> 408#include <__ranges/split_view.h> 409#include <__ranges/subrange.h> 410#include <__ranges/take_view.h> 411#include <__ranges/take_while_view.h> 412#include <__ranges/to.h> 413#include <__ranges/transform_view.h> 414#include <__ranges/view_interface.h> 415#include <__ranges/views.h> 416#include <__ranges/zip_view.h> 417#include <version> 418 419#if !defined(_LIBCPP_HAS_NO_LOCALIZATION) 420# include <__ranges/istream_view.h> 421#endif 422 423// standard-mandated includes 424 425// [ranges.syn] 426#include <compare> 427#include <initializer_list> 428#include <iterator> 429 430// [tuple.helper] 431#include <__tuple/tuple_element.h> 432#include <__tuple/tuple_size.h> 433 434#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 435# pragma GCC system_header 436#endif 437 438#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 439# include <cstdlib> 440# include <iosfwd> 441# include <type_traits> 442#endif 443 444#endif // _LIBCPP_RANGES 445