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 // [range.adaptor.object], range adaptor objects 97 template<class D> 98 requires is_class_v<D> && same_as<D, remove_cv_t<D>> 99 class range_adaptor_closure { }; // Since c++23 100 101 // [view.interface], class template view_interface 102 template<class D> 103 requires is_class_v<D> && same_as<D, remove_cv_t<D>> 104 class view_interface; 105 106 // [range.subrange], sub-ranges 107 enum class subrange_kind : bool { unsized, sized }; 108 109 template<input_or_output_iterator I, sentinel_for<I> S = I, subrange_kind K = see below> 110 requires (K == subrange_kind::sized || !sized_sentinel_for<S, I>) 111 class subrange; 112 113 template<class I, class S, subrange_kind K> 114 inline constexpr bool enable_borrowed_range<subrange<I, S, K>> = true; 115 116 // [range.dangling], dangling iterator handling 117 struct dangling; 118 119 template<range R> 120 using borrowed_iterator_t = see below; 121 122 template<range R> 123 using borrowed_subrange_t = see below; 124 125 // [range.elements], elements view 126 template<input_range V, size_t N> 127 requires see below 128 class elements_view; 129 130 template<class T, size_t N> 131 inline constexpr bool enable_borrowed_range<elements_view<T, N>> = 132 enable_borrowed_range<T>; 133 134 template<class R> 135 using keys_view = elements_view<R, 0>; 136 template<class R> 137 using values_view = elements_view<R, 1>; 138 139 namespace views { 140 template<size_t N> 141 inline constexpr unspecified elements = unspecified; 142 inline constexpr auto keys = elements<0>; 143 inline constexpr auto values = elements<1>; 144 } 145 146 // [range.utility.conv], range conversions 147 template<class C, input_range R, class... Args> requires (!view<C>) 148 constexpr C to(R&& r, Args&&... args); // Since C++23 149 template<template<class...> class C, input_range R, class... Args> 150 constexpr auto to(R&& r, Args&&... args); // Since C++23 151 template<class C, class... Args> requires (!view<C>) 152 constexpr auto to(Args&&... args); // Since C++23 153 template<template<class...> class C, class... Args> 154 constexpr auto to(Args&&... args); // Since C++23 155 156 // [range.empty], empty view 157 template<class T> 158 requires is_object_v<T> 159 class empty_view; 160 161 template<class T> 162 inline constexpr bool enable_borrowed_range<empty_view<T>> = true; 163 164 namespace views { 165 template<class T> 166 inline constexpr empty_view<T> empty{}; 167 } 168 169 // [range.all], all view 170 namespace views { 171 inline constexpr unspecified all = unspecified; 172 173 template<viewable_range R> 174 using all_t = decltype(all(declval<R>())); 175 } 176 177 template<range R> 178 requires is_object_v<R> 179 class ref_view; 180 181 template<class T> 182 inline constexpr bool enable_borrowed_range<ref_view<T>> = true; 183 184 template<range R> 185 requires see below 186 class owning_view; 187 188 template<class T> 189 inline constexpr bool enable_borrowed_range<owning_view<T>> = enable_borrowed_range<T>; 190 191 // [range.filter], filter view 192 template<input_range V, indirect_unary_predicate<iterator_t<V>> Pred> 193 requires view<V> && is_object_v<Pred> 194 class filter_view; 195 196 namespace views { 197 inline constexpr unspecified filter = unspecified; 198 } 199 200 // [range.drop], drop view 201 template<view V> 202 class drop_view; 203 204 template<class T> 205 inline constexpr bool enable_borrowed_range<drop_view<T>> = enable_borrowed_range<T>; 206 207 // [range.drop.while], drop while view 208 template<view V, class Pred> 209 requires input_range<V> && is_object_v<Pred> && 210 indirect_unary_predicate<const Pred, iterator_t<V>> 211 class drop_while_view; 212 213 template<class T, class Pred> 214 inline constexpr bool enable_borrowed_range<drop_while_view<T, Pred>> = 215 enable_borrowed_range<T>; 216 217 namespace views { inline constexpr unspecified drop_while = unspecified; } 218 219 // [range.transform], transform view 220 template<input_range V, copy_constructible F> 221 requires view<V> && is_object_v<F> && 222 regular_invocable<F&, range_reference_t<V>> && 223 can-reference<invoke_result_t<F&, range_reference_t<V>>> 224 class transform_view; 225 226 // [range.counted], counted view 227 namespace views { inline constexpr unspecified counted = unspecified; } 228 229 // [range.common], common view 230 template<view V> 231 requires (!common_range<V> && copyable<iterator_t<V>>) 232 class common_view; 233 234 // [range.reverse], reverse view 235 template<view V> 236 requires bidirectional_range<V> 237 class reverse_view; 238 239 template<class T> 240 inline constexpr bool enable_borrowed_range<reverse_view<T>> = enable_borrowed_range<T>; 241 242 template<class T> 243 inline constexpr bool enable_borrowed_range<common_view<T>> = enable_borrowed_range<T>; 244 245 // [range.take], take view 246 template<view> class take_view; 247 248 template<class T> 249 inline constexpr bool enable_borrowed_range<take_view<T>> = enable_borrowed_range<T>; 250 251 // [range.take.while], take while view 252 template<view V, class Pred> 253 requires input_range<V> && is_object_v<Pred> && 254 indirect_unary_predicate<const Pred, iterator_t<V>> 255 class take_while_view; 256 257 namespace views { inline constexpr unspecified take_while = unspecified; } 258 259 template<copy_constructible T> 260 requires is_object_v<T> 261 class single_view; 262 263 template<weakly_incrementable W, semiregular Bound = unreachable_sentinel_t> 264 requires weakly-equality-comparable-with<W, Bound> && copyable<W> 265 class iota_view; 266 267 template<class W, class Bound> 268 inline constexpr bool enable_borrowed_range<iota_view<W, Bound>> = true; 269 270 // [range.repeat], repeat view 271 template<class T> 272 concept integer-like-with-usable-difference-type = // exposition only 273 is-signed-integer-like<T> || (is-integer-like<T> && weakly_incrementable<T>); 274 275 template<move_constructible T, semiregular Bound = unreachable_sentinel_t> 276 requires (is_object_v<T> && same_as<T, remove_cv_t<T>> && 277 (integer-like-with-usable-difference-type<Bound> || 278 same_as<Bound, unreachable_sentinel_t>)) 279 class repeat_view; 280 281 namespace views { inline constexpr unspecified repeat = unspecified; } 282 283 // [range.join], join view 284 template<input_range V> 285 requires view<V> && input_range<range_reference_t<V>> 286 class join_view; 287 288 // [range.lazy.split], lazy split view 289 template<class R> 290 concept tiny-range = see below; // exposition only 291 292 template<input_range V, forward_range Pattern> 293 requires view<V> && view<Pattern> && 294 indirectly_comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> && 295 (forward_range<V> || tiny-range<Pattern>) 296 class lazy_split_view; 297 298 // [range.split], split view 299 template<forward_range V, forward_range Pattern> 300 requires view<V> && view<Pattern> && 301 indirectly_comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> 302 class split_view; 303 304 namespace views { 305 inline constexpr unspecified lazy_split = unspecified; 306 inline constexpr unspecified split = unspecified; 307 } 308 309 // [range.istream], istream view 310 template<movable Val, class CharT, class Traits = char_traits<CharT>> 311 requires see below 312 class basic_istream_view; 313 314 template<class Val> 315 using istream_view = basic_istream_view<Val, char>; 316 317 template<class Val> 318 using wistream_view = basic_istream_view<Val, wchar_t>; 319 320 namespace views { template<class T> inline constexpr unspecified istream = unspecified; } 321 322 // [range.zip], zip view 323 template<input_range... Views> 324 requires (view<Views> && ...) && (sizeof...(Views) > 0) 325 class zip_view; // C++23 326 327 template<class... Views> 328 inline constexpr bool enable_borrowed_range<zip_view<Views...>> = // C++23 329 (enable_borrowed_range<Views> && ...); 330 331 namespace views { inline constexpr unspecified zip = unspecified; } // C++23 332 333 // [range.as.rvalue] 334 template <view V> 335 requires input_range<V> 336 class as_rvalue_view; // C++23 337 338 namespace views { inline constexpr unspecified as_rvalue ) unspecified; } // C++23 339 340 [range.chunk.by] 341 template<forward_range V, indirect_binary_predicate<iterator_t<V>, iterator_t<V>> Pred> 342 requires view<V> && is_object_v<Pred> 343 class chunk_by_view; // C++23 344 345 namespace views { inline constexpr unspecified chunk_by = unspecified; } // C++23 346} 347 348namespace std { 349 namespace views = ranges::views; 350 351 template<class T> struct tuple_size; 352 template<size_t I, class T> struct tuple_element; 353 354 template<class I, class S, ranges::subrange_kind K> 355 struct tuple_size<ranges::subrange<I, S, K>> 356 : integral_constant<size_t, 2> {}; 357 358 template<class I, class S, ranges::subrange_kind K> 359 struct tuple_element<0, ranges::subrange<I, S, K>> { 360 using type = I; 361 }; 362 363 template<class I, class S, ranges::subrange_kind K> 364 struct tuple_element<1, ranges::subrange<I, S, K>> { 365 using type = S; 366 }; 367 368 template<class I, class S, ranges::subrange_kind K> 369 struct tuple_element<0, const ranges::subrange<I, S, K>> { 370 using type = I; 371 }; 372 373 template<class I, class S, ranges::subrange_kind K> 374 struct tuple_element<1, const ranges::subrange<I, S, K>> { 375 using type = S; 376 }; 377 378 struct from_range_t { explicit from_range_t() = default; }; // Since C++23 379 inline constexpr from_range_t from_range{}; // Since C++23 380} 381*/ 382 383#include <__config> 384 385#if _LIBCPP_STD_VER >= 20 386# include <__ranges/access.h> 387# include <__ranges/all.h> 388# include <__ranges/common_view.h> 389# include <__ranges/concepts.h> 390# include <__ranges/counted.h> 391# include <__ranges/dangling.h> 392# include <__ranges/data.h> 393# include <__ranges/drop_view.h> 394# include <__ranges/drop_while_view.h> 395# include <__ranges/elements_view.h> 396# include <__ranges/empty.h> 397# include <__ranges/empty_view.h> 398# include <__ranges/enable_borrowed_range.h> 399# include <__ranges/enable_view.h> 400# include <__ranges/filter_view.h> 401# include <__ranges/iota_view.h> 402# include <__ranges/join_view.h> 403# include <__ranges/lazy_split_view.h> 404# include <__ranges/rbegin.h> 405# include <__ranges/ref_view.h> 406# include <__ranges/rend.h> 407# include <__ranges/reverse_view.h> 408# include <__ranges/single_view.h> 409# include <__ranges/size.h> 410# include <__ranges/split_view.h> 411# include <__ranges/subrange.h> 412# include <__ranges/take_view.h> 413# include <__ranges/take_while_view.h> 414# include <__ranges/transform_view.h> 415# include <__ranges/view_interface.h> 416# include <__ranges/views.h> 417 418# if !defined(_LIBCPP_HAS_NO_LOCALIZATION) 419# include <__ranges/istream_view.h> 420# endif 421#endif 422 423#if _LIBCPP_STD_VER >= 23 424# include <__ranges/as_rvalue_view.h> 425# include <__ranges/chunk_by_view.h> 426# include <__ranges/from_range.h> 427# include <__ranges/repeat_view.h> 428# include <__ranges/to.h> 429# include <__ranges/zip_view.h> 430#endif 431 432#include <version> 433 434// standard-mandated includes 435 436// [ranges.syn] 437#include <compare> 438#include <initializer_list> 439#include <iterator> 440 441// [tuple.helper] 442#include <__tuple/tuple_element.h> 443#include <__tuple/tuple_size.h> 444 445#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 446# pragma GCC system_header 447#endif 448 449#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 17 450# include <cstddef> 451# include <limits> 452# include <optional> 453# include <span> 454# include <tuple> 455#endif 456 457#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 458# include <cstdlib> 459# include <iosfwd> 460# include <type_traits> 461#endif 462 463#endif // _LIBCPP_RANGES 464