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_STRING_VIEW 11#define _LIBCPP_STRING_VIEW 12 13/* 14 15 string_view synopsis 16 17#include <compare> 18 19namespace std { 20 21 // 7.2, Class template basic_string_view 22 template<class charT, class traits = char_traits<charT>> 23 class basic_string_view; 24 25 template<class charT, class traits> 26 inline constexpr bool ranges::enable_view<basic_string_view<charT, traits>> = true; 27 28 template<class charT, class traits> 29 inline constexpr bool ranges::enable_borrowed_range<basic_string_view<charT, traits>> = true; // C++20 30 31 // 7.9, basic_string_view non-member comparison functions 32 template<class charT, class traits> 33 constexpr bool operator==(basic_string_view<charT, traits> x, 34 basic_string_view<charT, traits> y) noexcept; 35 template<class charT, class traits> // Removed in C++20 36 constexpr bool operator!=(basic_string_view<charT, traits> x, 37 basic_string_view<charT, traits> y) noexcept; 38 template<class charT, class traits> // Removed in C++20 39 constexpr bool operator< (basic_string_view<charT, traits> x, 40 basic_string_view<charT, traits> y) noexcept; 41 template<class charT, class traits> // Removed in C++20 42 constexpr bool operator> (basic_string_view<charT, traits> x, 43 basic_string_view<charT, traits> y) noexcept; 44 template<class charT, class traits> // Removed in C++20 45 constexpr bool operator<=(basic_string_view<charT, traits> x, 46 basic_string_view<charT, traits> y) noexcept; 47 template<class charT, class traits> // Removed in C++20 48 constexpr bool operator>=(basic_string_view<charT, traits> x, 49 basic_string_view<charT, traits> y) noexcept; 50 template<class charT, class traits> // Since C++20 51 constexpr see below operator<=>(basic_string_view<charT, traits> x, 52 basic_string_view<charT, traits> y) noexcept; 53 54 // see below, sufficient additional overloads of comparison functions 55 56 // 7.10, Inserters and extractors 57 template<class charT, class traits> 58 basic_ostream<charT, traits>& 59 operator<<(basic_ostream<charT, traits>& os, 60 basic_string_view<charT, traits> str); 61 62 // basic_string_view typedef names 63 typedef basic_string_view<char> string_view; 64 typedef basic_string_view<char8_t> u8string_view; // C++20 65 typedef basic_string_view<char16_t> u16string_view; 66 typedef basic_string_view<char32_t> u32string_view; 67 typedef basic_string_view<wchar_t> wstring_view; 68 69 template<class charT, class traits = char_traits<charT>> 70 class basic_string_view { 71 public: 72 // types 73 typedef traits traits_type; 74 typedef charT value_type; 75 typedef charT* pointer; 76 typedef const charT* const_pointer; 77 typedef charT& reference; 78 typedef const charT& const_reference; 79 typedef implementation-defined const_iterator; 80 typedef const_iterator iterator; 81 typedef reverse_iterator<const_iterator> const_reverse_iterator; 82 typedef const_reverse_iterator reverse_iterator; 83 typedef size_t size_type; 84 typedef ptrdiff_t difference_type; 85 static constexpr size_type npos = size_type(-1); 86 87 // 7.3, basic_string_view constructors and assignment operators 88 constexpr basic_string_view() noexcept; 89 constexpr basic_string_view(const basic_string_view&) noexcept = default; 90 basic_string_view& operator=(const basic_string_view&) noexcept = default; 91 template<class Allocator> 92 constexpr basic_string_view(const charT* str); 93 basic_string_view(nullptr_t) = delete; // C++2b 94 constexpr basic_string_view(const charT* str, size_type len); 95 template <class It, class End> 96 constexpr basic_string_view(It begin, End end); // C++20 97 template <class Range> 98 constexpr basic_string_view(Range&& r); // C++23 99 100 // 7.4, basic_string_view iterator support 101 constexpr const_iterator begin() const noexcept; 102 constexpr const_iterator end() const noexcept; 103 constexpr const_iterator cbegin() const noexcept; 104 constexpr const_iterator cend() const noexcept; 105 const_reverse_iterator rbegin() const noexcept; 106 const_reverse_iterator rend() const noexcept; 107 const_reverse_iterator crbegin() const noexcept; 108 const_reverse_iterator crend() const noexcept; 109 110 // 7.5, basic_string_view capacity 111 constexpr size_type size() const noexcept; 112 constexpr size_type length() const noexcept; 113 constexpr size_type max_size() const noexcept; 114 constexpr bool empty() const noexcept; 115 116 // 7.6, basic_string_view element access 117 constexpr const_reference operator[](size_type pos) const; 118 constexpr const_reference at(size_type pos) const; 119 constexpr const_reference front() const; 120 constexpr const_reference back() const; 121 constexpr const_pointer data() const noexcept; 122 123 // 7.7, basic_string_view modifiers 124 constexpr void remove_prefix(size_type n); 125 constexpr void remove_suffix(size_type n); 126 constexpr void swap(basic_string_view& s) noexcept; 127 128 size_type copy(charT* s, size_type n, size_type pos = 0) const; // constexpr in C++20 129 130 constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const; 131 constexpr int compare(basic_string_view s) const noexcept; 132 constexpr int compare(size_type pos1, size_type n1, basic_string_view s) const; 133 constexpr int compare(size_type pos1, size_type n1, 134 basic_string_view s, size_type pos2, size_type n2) const; 135 constexpr int compare(const charT* s) const; 136 constexpr int compare(size_type pos1, size_type n1, const charT* s) const; 137 constexpr int compare(size_type pos1, size_type n1, 138 const charT* s, size_type n2) const; 139 constexpr size_type find(basic_string_view s, size_type pos = 0) const noexcept; 140 constexpr size_type find(charT c, size_type pos = 0) const noexcept; 141 constexpr size_type find(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 142 constexpr size_type find(const charT* s, size_type pos = 0) const noexcept; // noexcept as an extension 143 constexpr size_type rfind(basic_string_view s, size_type pos = npos) const noexcept; 144 constexpr size_type rfind(charT c, size_type pos = npos) const noexcept; 145 constexpr size_type rfind(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 146 constexpr size_type rfind(const charT* s, size_type pos = npos) const noexcept; // noexcept as an extension 147 constexpr size_type find_first_of(basic_string_view s, size_type pos = 0) const noexcept; 148 constexpr size_type find_first_of(charT c, size_type pos = 0) const noexcept; 149 constexpr size_type find_first_of(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 150 constexpr size_type find_first_of(const charT* s, size_type pos = 0) const noexcept; // noexcept as an extension 151 constexpr size_type find_last_of(basic_string_view s, size_type pos = npos) const noexcept; 152 constexpr size_type find_last_of(charT c, size_type pos = npos) const noexcept; 153 constexpr size_type find_last_of(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 154 constexpr size_type find_last_of(const charT* s, size_type pos = npos) const noexcept; // noexcept as an extension 155 constexpr size_type find_first_not_of(basic_string_view s, size_type pos = 0) const noexcept; 156 constexpr size_type find_first_not_of(charT c, size_type pos = 0) const noexcept; 157 constexpr size_type find_first_not_of(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 158 constexpr size_type find_first_not_of(const charT* s, size_type pos = 0) const noexcept; // noexcept as an extension 159 constexpr size_type find_last_not_of(basic_string_view s, size_type pos = npos) const noexcept; 160 constexpr size_type find_last_not_of(charT c, size_type pos = npos) const noexcept; 161 constexpr size_type find_last_not_of(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 162 constexpr size_type find_last_not_of(const charT* s, size_type pos = npos) const noexcept; // noexcept as an extension 163 164 constexpr bool starts_with(basic_string_view s) const noexcept; // C++20 165 constexpr bool starts_with(charT c) const noexcept; // C++20 166 constexpr bool starts_with(const charT* s) const; // C++20 167 constexpr bool ends_with(basic_string_view s) const noexcept; // C++20 168 constexpr bool ends_with(charT c) const noexcept; // C++20 169 constexpr bool ends_with(const charT* s) const; // C++20 170 171 constexpr bool contains(basic_string_view s) const noexcept; // C++2b 172 constexpr bool contains(charT c) const noexcept; // C++2b 173 constexpr bool contains(const charT* s) const; // C++2b 174 175 private: 176 const_pointer data_; // exposition only 177 size_type size_; // exposition only 178 }; 179 180 // basic_string_view deduction guides 181 template<class It, class End> 182 basic_string_view(It, End) -> basic_string_view<iter_value_t<It>>; // C++20 183 template<class Range> 184 basic_string_view(Range&&) -> basic_string_view<ranges::range_value_t<Range>>; // C++23 185 186 // 7.11, Hash support 187 template <class T> struct hash; 188 template <> struct hash<string_view>; 189 template <> struct hash<u8string_view>; // C++20 190 template <> struct hash<u16string_view>; 191 template <> struct hash<u32string_view>; 192 template <> struct hash<wstring_view>; 193 194 constexpr basic_string_view<char> operator "" sv(const char *str, size_t len) noexcept; 195 constexpr basic_string_view<wchar_t> operator "" sv(const wchar_t *str, size_t len) noexcept; 196 constexpr basic_string_view<char8_t> operator "" sv(const char8_t *str, size_t len) noexcept; // C++20 197 constexpr basic_string_view<char16_t> operator "" sv(const char16_t *str, size_t len) noexcept; 198 constexpr basic_string_view<char32_t> operator "" sv(const char32_t *str, size_t len) noexcept; 199 200} // namespace std 201 202 203*/ 204 205#include <__algorithm/min.h> 206#include <__assert> // all public C++ headers provide the assertion handler 207#include <__config> 208#include <__functional/hash.h> 209#include <__functional/unary_function.h> 210#include <__fwd/string_view.h> 211#include <__iterator/concepts.h> 212#include <__iterator/readable_traits.h> 213#include <__iterator/reverse_iterator.h> 214#include <__memory/pointer_traits.h> 215#include <__ranges/concepts.h> 216#include <__ranges/data.h> 217#include <__ranges/enable_borrowed_range.h> 218#include <__ranges/enable_view.h> 219#include <__ranges/size.h> 220#include <__string/char_traits.h> 221#include <iosfwd> 222#include <limits> 223#include <stdexcept> 224#include <type_traits> 225#include <version> 226 227// standard-mandated includes 228 229// [iterator.range] 230#include <__iterator/access.h> 231#include <__iterator/data.h> 232#include <__iterator/empty.h> 233#include <__iterator/reverse_access.h> 234#include <__iterator/size.h> 235 236// [string.view.synop] 237#include <compare> 238 239#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 240# pragma GCC system_header 241#endif 242 243_LIBCPP_PUSH_MACROS 244#include <__undef_macros> 245 246 247_LIBCPP_BEGIN_NAMESPACE_STD 248 249// TODO: This is a workaround for some vendors to carry a downstream diff to accept `nullptr` in 250// string_view constructors. This can be refactored when this exact form isn't needed anymore. 251template <class _Traits> 252_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR 253inline size_t __char_traits_length_checked(const typename _Traits::char_type* __s) _NOEXCEPT { 254 // This needs to be a single statement for C++11 constexpr 255 return _LIBCPP_ASSERT(__s != nullptr, "null pointer passed to non-null argument of char_traits<...>::length"), _Traits::length(__s); 256} 257 258template<class _CharT, class _Traits> 259class basic_string_view { 260public: 261 // types 262 using traits_type = _Traits; 263 using value_type = _CharT; 264 using pointer = _CharT*; 265 using const_pointer = const _CharT*; 266 using reference = _CharT&; 267 using const_reference = const _CharT&; 268 using const_iterator = const_pointer; // See [string.view.iterators] 269 using iterator = const_iterator; 270 using const_reverse_iterator = _VSTD::reverse_iterator<const_iterator>; 271 using reverse_iterator = const_reverse_iterator; 272 using size_type = size_t; 273 using difference_type = ptrdiff_t; 274 static _LIBCPP_CONSTEXPR const size_type npos = -1; // size_type(-1); 275 276 static_assert((!is_array<value_type>::value), "Character type of basic_string_view must not be an array"); 277 static_assert(( is_standard_layout<value_type>::value), "Character type of basic_string_view must be standard-layout"); 278 static_assert(( is_trivial<value_type>::value), "Character type of basic_string_view must be trivial"); 279 static_assert((is_same<_CharT, typename traits_type::char_type>::value), 280 "traits_type::char_type must be the same type as CharT"); 281 282 // [string.view.cons], construct/copy 283 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 284 basic_string_view() _NOEXCEPT : __data_(nullptr), __size_(0) {} 285 286 _LIBCPP_INLINE_VISIBILITY 287 basic_string_view(const basic_string_view&) _NOEXCEPT = default; 288 289 _LIBCPP_INLINE_VISIBILITY 290 basic_string_view& operator=(const basic_string_view&) _NOEXCEPT = default; 291 292 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 293 basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT 294 : __data_(__s), __size_(__len) 295 { 296#if _LIBCPP_STD_VER > 11 297 _LIBCPP_ASSERT(__len == 0 || __s != nullptr, "string_view::string_view(_CharT *, size_t): received nullptr"); 298#endif 299 } 300 301#if _LIBCPP_STD_VER > 17 302 template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 303 requires (is_same_v<iter_value_t<_It>, _CharT> && !is_convertible_v<_End, size_type>) 304 constexpr _LIBCPP_HIDE_FROM_ABI basic_string_view(_It __begin, _End __end) 305 : __data_(_VSTD::to_address(__begin)), __size_(__end - __begin) 306 { 307 _LIBCPP_ASSERT((__end - __begin) >= 0, "std::string_view::string_view(iterator, sentinel) received invalid range"); 308 } 309#endif // _LIBCPP_STD_VER > 17 310 311#if _LIBCPP_STD_VER > 20 312 template <class _Range> 313 requires ( 314 !is_same_v<remove_cvref_t<_Range>, basic_string_view> && 315 ranges::contiguous_range<_Range> && 316 ranges::sized_range<_Range> && 317 is_same_v<ranges::range_value_t<_Range>, _CharT> && 318 !is_convertible_v<_Range, const _CharT*> && 319 (!requires(remove_cvref_t<_Range>& __d) { 320 __d.operator _VSTD::basic_string_view<_CharT, _Traits>(); 321 }) && 322 (!requires { 323 typename remove_reference_t<_Range>::traits_type; 324 } || is_same_v<typename remove_reference_t<_Range>::traits_type, _Traits>) 325 ) 326 constexpr explicit _LIBCPP_HIDE_FROM_ABI 327 basic_string_view(_Range&& __r) : __data_(ranges::data(__r)), __size_(ranges::size(__r)) {} 328#endif // _LIBCPP_STD_VER > 20 329 330 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 331 basic_string_view(const _CharT* __s) 332 : __data_(__s), __size_(_VSTD::__char_traits_length_checked<_Traits>(__s)) {} 333 334#if _LIBCPP_STD_VER > 20 335 basic_string_view(nullptr_t) = delete; 336#endif 337 338 // [string.view.iterators], iterators 339 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 340 const_iterator begin() const _NOEXCEPT { return cbegin(); } 341 342 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 343 const_iterator end() const _NOEXCEPT { return cend(); } 344 345 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 346 const_iterator cbegin() const _NOEXCEPT { return __data_; } 347 348 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 349 const_iterator cend() const _NOEXCEPT { return __data_ + __size_; } 350 351 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_INLINE_VISIBILITY 352 const_reverse_iterator rbegin() const _NOEXCEPT { return const_reverse_iterator(cend()); } 353 354 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_INLINE_VISIBILITY 355 const_reverse_iterator rend() const _NOEXCEPT { return const_reverse_iterator(cbegin()); } 356 357 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_INLINE_VISIBILITY 358 const_reverse_iterator crbegin() const _NOEXCEPT { return const_reverse_iterator(cend()); } 359 360 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_INLINE_VISIBILITY 361 const_reverse_iterator crend() const _NOEXCEPT { return const_reverse_iterator(cbegin()); } 362 363 // [string.view.capacity], capacity 364 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 365 size_type size() const _NOEXCEPT { return __size_; } 366 367 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 368 size_type length() const _NOEXCEPT { return __size_; } 369 370 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 371 size_type max_size() const _NOEXCEPT { return numeric_limits<size_type>::max() / sizeof(value_type); } 372 373 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 374 bool empty() const _NOEXCEPT { return __size_ == 0; } 375 376 // [string.view.access], element access 377 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 378 const_reference operator[](size_type __pos) const _NOEXCEPT { 379 return _LIBCPP_ASSERT(__pos < size(), "string_view[] index out of bounds"), __data_[__pos]; 380 } 381 382 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 383 const_reference at(size_type __pos) const 384 { 385 return __pos >= size() 386 ? (__throw_out_of_range("string_view::at"), __data_[0]) 387 : __data_[__pos]; 388 } 389 390 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 391 const_reference front() const _NOEXCEPT 392 { 393 return _LIBCPP_ASSERT(!empty(), "string_view::front(): string is empty"), __data_[0]; 394 } 395 396 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 397 const_reference back() const _NOEXCEPT 398 { 399 return _LIBCPP_ASSERT(!empty(), "string_view::back(): string is empty"), __data_[__size_-1]; 400 } 401 402 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 403 const_pointer data() const _NOEXCEPT { return __data_; } 404 405 // [string.view.modifiers], modifiers: 406 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 407 void remove_prefix(size_type __n) _NOEXCEPT 408 { 409 _LIBCPP_ASSERT(__n <= size(), "remove_prefix() can't remove more than size()"); 410 __data_ += __n; 411 __size_ -= __n; 412 } 413 414 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 415 void remove_suffix(size_type __n) _NOEXCEPT 416 { 417 _LIBCPP_ASSERT(__n <= size(), "remove_suffix() can't remove more than size()"); 418 __size_ -= __n; 419 } 420 421 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 422 void swap(basic_string_view& __other) _NOEXCEPT 423 { 424 const value_type *__p = __data_; 425 __data_ = __other.__data_; 426 __other.__data_ = __p; 427 428 size_type __sz = __size_; 429 __size_ = __other.__size_; 430 __other.__size_ = __sz; 431 } 432 433 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 434 size_type copy(_CharT* __s, size_type __n, size_type __pos = 0) const 435 { 436 if (__pos > size()) 437 __throw_out_of_range("string_view::copy"); 438 size_type __rlen = _VSTD::min(__n, size() - __pos); 439 _Traits::copy(__s, data() + __pos, __rlen); 440 return __rlen; 441 } 442 443 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 444 basic_string_view substr(size_type __pos = 0, size_type __n = npos) const 445 { 446 return __pos > size() 447 ? (__throw_out_of_range("string_view::substr"), basic_string_view()) 448 : basic_string_view(data() + __pos, _VSTD::min(__n, size() - __pos)); 449 } 450 451 _LIBCPP_CONSTEXPR_SINCE_CXX14 int compare(basic_string_view __sv) const _NOEXCEPT 452 { 453 size_type __rlen = _VSTD::min(size(), __sv.size()); 454 int __retval = _Traits::compare(data(), __sv.data(), __rlen); 455 if (__retval == 0) // first __rlen chars matched 456 __retval = size() == __sv.size() ? 0 : (size() < __sv.size() ? -1 : 1); 457 return __retval; 458 } 459 460 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 461 int compare(size_type __pos1, size_type __n1, basic_string_view __sv) const 462 { 463 return substr(__pos1, __n1).compare(__sv); 464 } 465 466 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 467 int compare( size_type __pos1, size_type __n1, 468 basic_string_view __sv, size_type __pos2, size_type __n2) const 469 { 470 return substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2)); 471 } 472 473 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 474 int compare(const _CharT* __s) const _NOEXCEPT 475 { 476 return compare(basic_string_view(__s)); 477 } 478 479 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 480 int compare(size_type __pos1, size_type __n1, const _CharT* __s) const 481 { 482 return substr(__pos1, __n1).compare(basic_string_view(__s)); 483 } 484 485 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 486 int compare(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2) const 487 { 488 return substr(__pos1, __n1).compare(basic_string_view(__s, __n2)); 489 } 490 491 // find 492 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 493 size_type find(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT 494 { 495 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 496 return std::__str_find<value_type, size_type, traits_type, npos> 497 (data(), size(), __s.data(), __pos, __s.size()); 498 } 499 500 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 501 size_type find(_CharT __c, size_type __pos = 0) const _NOEXCEPT 502 { 503 return std::__str_find<value_type, size_type, traits_type, npos> 504 (data(), size(), __c, __pos); 505 } 506 507 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 508 size_type find(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 509 { 510 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find(): received nullptr"); 511 return std::__str_find<value_type, size_type, traits_type, npos> 512 (data(), size(), __s, __pos, __n); 513 } 514 515 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 516 size_type find(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT 517 { 518 _LIBCPP_ASSERT(__s != nullptr, "string_view::find(): received nullptr"); 519 return std::__str_find<value_type, size_type, traits_type, npos> 520 (data(), size(), __s, __pos, traits_type::length(__s)); 521 } 522 523 // rfind 524 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 525 size_type rfind(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT 526 { 527 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 528 return std::__str_rfind<value_type, size_type, traits_type, npos> 529 (data(), size(), __s.data(), __pos, __s.size()); 530 } 531 532 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 533 size_type rfind(_CharT __c, size_type __pos = npos) const _NOEXCEPT 534 { 535 return std::__str_rfind<value_type, size_type, traits_type, npos> 536 (data(), size(), __c, __pos); 537 } 538 539 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 540 size_type rfind(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 541 { 542 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::rfind(): received nullptr"); 543 return std::__str_rfind<value_type, size_type, traits_type, npos> 544 (data(), size(), __s, __pos, __n); 545 } 546 547 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 548 size_type rfind(const _CharT* __s, size_type __pos=npos) const _NOEXCEPT 549 { 550 _LIBCPP_ASSERT(__s != nullptr, "string_view::rfind(): received nullptr"); 551 return std::__str_rfind<value_type, size_type, traits_type, npos> 552 (data(), size(), __s, __pos, traits_type::length(__s)); 553 } 554 555 // find_first_of 556 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 557 size_type find_first_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT 558 { 559 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_of(): received nullptr"); 560 return std::__str_find_first_of<value_type, size_type, traits_type, npos> 561 (data(), size(), __s.data(), __pos, __s.size()); 562 } 563 564 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 565 size_type find_first_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT 566 { return find(__c, __pos); } 567 568 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 569 size_type find_first_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 570 { 571 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_of(): received nullptr"); 572 return std::__str_find_first_of<value_type, size_type, traits_type, npos> 573 (data(), size(), __s, __pos, __n); 574 } 575 576 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 577 size_type find_first_of(const _CharT* __s, size_type __pos=0) const _NOEXCEPT 578 { 579 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_of(): received nullptr"); 580 return std::__str_find_first_of<value_type, size_type, traits_type, npos> 581 (data(), size(), __s, __pos, traits_type::length(__s)); 582 } 583 584 // find_last_of 585 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 586 size_type find_last_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT 587 { 588 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_of(): received nullptr"); 589 return std::__str_find_last_of<value_type, size_type, traits_type, npos> 590 (data(), size(), __s.data(), __pos, __s.size()); 591 } 592 593 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 594 size_type find_last_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT 595 { return rfind(__c, __pos); } 596 597 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 598 size_type find_last_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 599 { 600 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_of(): received nullptr"); 601 return std::__str_find_last_of<value_type, size_type, traits_type, npos> 602 (data(), size(), __s, __pos, __n); 603 } 604 605 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 606 size_type find_last_of(const _CharT* __s, size_type __pos=npos) const _NOEXCEPT 607 { 608 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_of(): received nullptr"); 609 return std::__str_find_last_of<value_type, size_type, traits_type, npos> 610 (data(), size(), __s, __pos, traits_type::length(__s)); 611 } 612 613 // find_first_not_of 614 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 615 size_type find_first_not_of(basic_string_view __s, size_type __pos=0) const _NOEXCEPT 616 { 617 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_not_of(): received nullptr"); 618 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos> 619 (data(), size(), __s.data(), __pos, __s.size()); 620 } 621 622 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 623 size_type find_first_not_of(_CharT __c, size_type __pos=0) const _NOEXCEPT 624 { 625 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos> 626 (data(), size(), __c, __pos); 627 } 628 629 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 630 size_type find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 631 { 632 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_not_of(): received nullptr"); 633 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos> 634 (data(), size(), __s, __pos, __n); 635 } 636 637 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 638 size_type find_first_not_of(const _CharT* __s, size_type __pos=0) const _NOEXCEPT 639 { 640 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_not_of(): received nullptr"); 641 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos> 642 (data(), size(), __s, __pos, traits_type::length(__s)); 643 } 644 645 // find_last_not_of 646 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 647 size_type find_last_not_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT 648 { 649 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_not_of(): received nullptr"); 650 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos> 651 (data(), size(), __s.data(), __pos, __s.size()); 652 } 653 654 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 655 size_type find_last_not_of(_CharT __c, size_type __pos=npos) const _NOEXCEPT 656 { 657 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos> 658 (data(), size(), __c, __pos); 659 } 660 661 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 662 size_type find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 663 { 664 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_not_of(): received nullptr"); 665 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos> 666 (data(), size(), __s, __pos, __n); 667 } 668 669 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 670 size_type find_last_not_of(const _CharT* __s, size_type __pos=npos) const _NOEXCEPT 671 { 672 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_not_of(): received nullptr"); 673 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos> 674 (data(), size(), __s, __pos, traits_type::length(__s)); 675 } 676 677#if _LIBCPP_STD_VER > 17 678 constexpr _LIBCPP_INLINE_VISIBILITY 679 bool starts_with(basic_string_view __s) const noexcept 680 { return size() >= __s.size() && compare(0, __s.size(), __s) == 0; } 681 682 constexpr _LIBCPP_INLINE_VISIBILITY 683 bool starts_with(value_type __c) const noexcept 684 { return !empty() && _Traits::eq(front(), __c); } 685 686 constexpr _LIBCPP_INLINE_VISIBILITY 687 bool starts_with(const value_type* __s) const noexcept 688 { return starts_with(basic_string_view(__s)); } 689 690 constexpr _LIBCPP_INLINE_VISIBILITY 691 bool ends_with(basic_string_view __s) const noexcept 692 { return size() >= __s.size() && compare(size() - __s.size(), npos, __s) == 0; } 693 694 constexpr _LIBCPP_INLINE_VISIBILITY 695 bool ends_with(value_type __c) const noexcept 696 { return !empty() && _Traits::eq(back(), __c); } 697 698 constexpr _LIBCPP_INLINE_VISIBILITY 699 bool ends_with(const value_type* __s) const noexcept 700 { return ends_with(basic_string_view(__s)); } 701#endif 702 703#if _LIBCPP_STD_VER > 20 704 constexpr _LIBCPP_INLINE_VISIBILITY 705 bool contains(basic_string_view __sv) const noexcept 706 { return find(__sv) != npos; } 707 708 constexpr _LIBCPP_INLINE_VISIBILITY 709 bool contains(value_type __c) const noexcept 710 { return find(__c) != npos; } 711 712 constexpr _LIBCPP_INLINE_VISIBILITY 713 bool contains(const value_type* __s) const 714 { return find(__s) != npos; } 715#endif 716 717private: 718 const value_type* __data_; 719 size_type __size_; 720}; 721_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(basic_string_view); 722 723#if _LIBCPP_STD_VER > 17 724template <class _CharT, class _Traits> 725inline constexpr bool ranges::enable_view<basic_string_view<_CharT, _Traits>> = true; 726 727template <class _CharT, class _Traits> 728inline constexpr bool ranges::enable_borrowed_range<basic_string_view<_CharT, _Traits> > = true; 729#endif // _LIBCPP_STD_VER > 17 730 731// [string.view.deduct] 732 733#if _LIBCPP_STD_VER > 17 734template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 735 basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>; 736#endif // _LIBCPP_STD_VER > 17 737 738 739#if _LIBCPP_STD_VER > 20 740template <ranges::contiguous_range _Range> 741 basic_string_view(_Range) -> basic_string_view<ranges::range_value_t<_Range>>; 742#endif 743 744// [string.view.comparison] 745// operator == 746template<class _CharT, class _Traits> 747_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 748bool operator==(basic_string_view<_CharT, _Traits> __lhs, 749 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 750{ 751 if (__lhs.size() != __rhs.size()) return false; 752 return __lhs.compare(__rhs) == 0; 753} 754 755// The dummy default template parameters are used to work around a MSVC issue with mangling, see VSO-409326 for details. 756// This applies to the other sufficient overloads below for the other comparison operators. 757template<class _CharT, class _Traits, int = 1> 758_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 759bool operator==(basic_string_view<_CharT, _Traits> __lhs, 760 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT 761{ 762 if (__lhs.size() != __rhs.size()) return false; 763 return __lhs.compare(__rhs) == 0; 764} 765 766#if _LIBCPP_STD_VER < 20 767// This overload is automatically generated in C++20. 768template<class _CharT, class _Traits, int = 2> 769_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 770bool operator==(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 771 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 772{ 773 if (__lhs.size() != __rhs.size()) return false; 774 return __lhs.compare(__rhs) == 0; 775} 776#endif // _LIBCPP_STD_VER > 17 777 778// operator <=> 779 780#if _LIBCPP_STD_VER > 17 781 782template <class _CharT, class _Traits> 783_LIBCPP_HIDE_FROM_ABI constexpr auto 784operator<=>(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) noexcept { 785 if constexpr (requires { typename _Traits::comparison_category; }) { 786 // [string.view]/4 787 static_assert( 788 __comparison_category<typename _Traits::comparison_category>, 789 "return type is not a comparison category type"); 790 return static_cast<typename _Traits::comparison_category>(__lhs.compare(__rhs) <=> 0); 791 } else { 792 return static_cast<weak_ordering>(__lhs.compare(__rhs) <=> 0); 793 } 794} 795 796template <class _CharT, class _Traits, int = 1> 797_LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>( 798 basic_string_view<_CharT, _Traits> __lhs, type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) noexcept { 799 if constexpr (requires { typename _Traits::comparison_category; }) { 800 // [string.view]/4 801 static_assert( 802 __comparison_category<typename _Traits::comparison_category>, 803 "return type is not a comparison category type"); 804 return static_cast<typename _Traits::comparison_category>(__lhs.compare(__rhs) <=> 0); 805 } else { 806 return static_cast<weak_ordering>(__lhs.compare(__rhs) <=> 0); 807 } 808} 809 810#else // _LIBCPP_STD_VER > 17 811 812// operator != 813template<class _CharT, class _Traits> 814_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 815bool operator!=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 816{ 817 if (__lhs.size() != __rhs.size()) 818 return true; 819 return __lhs.compare(__rhs) != 0; 820} 821 822template<class _CharT, class _Traits, int = 1> 823_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 824bool operator!=(basic_string_view<_CharT, _Traits> __lhs, 825 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT 826{ 827 if (__lhs.size() != __rhs.size()) 828 return true; 829 return __lhs.compare(__rhs) != 0; 830} 831 832template<class _CharT, class _Traits, int = 2> 833_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 834bool operator!=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 835 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 836{ 837 if (__lhs.size() != __rhs.size()) 838 return true; 839 return __lhs.compare(__rhs) != 0; 840} 841 842 843// operator < 844template<class _CharT, class _Traits> 845_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 846bool operator<(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 847{ 848 return __lhs.compare(__rhs) < 0; 849} 850 851template<class _CharT, class _Traits, int = 1> 852_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 853bool operator<(basic_string_view<_CharT, _Traits> __lhs, 854 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT 855{ 856 return __lhs.compare(__rhs) < 0; 857} 858 859template<class _CharT, class _Traits, int = 2> 860_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 861bool operator<(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 862 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 863{ 864 return __lhs.compare(__rhs) < 0; 865} 866 867 868// operator > 869template<class _CharT, class _Traits> 870_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 871bool operator> (basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 872{ 873 return __lhs.compare(__rhs) > 0; 874} 875 876template<class _CharT, class _Traits, int = 1> 877_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 878bool operator>(basic_string_view<_CharT, _Traits> __lhs, 879 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT 880{ 881 return __lhs.compare(__rhs) > 0; 882} 883 884template<class _CharT, class _Traits, int = 2> 885_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 886bool operator>(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 887 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 888{ 889 return __lhs.compare(__rhs) > 0; 890} 891 892 893// operator <= 894template<class _CharT, class _Traits> 895_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 896bool operator<=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 897{ 898 return __lhs.compare(__rhs) <= 0; 899} 900 901template<class _CharT, class _Traits, int = 1> 902_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 903bool operator<=(basic_string_view<_CharT, _Traits> __lhs, 904 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT 905{ 906 return __lhs.compare(__rhs) <= 0; 907} 908 909template<class _CharT, class _Traits, int = 2> 910_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 911bool operator<=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 912 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 913{ 914 return __lhs.compare(__rhs) <= 0; 915} 916 917 918// operator >= 919template<class _CharT, class _Traits> 920_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 921bool operator>=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 922{ 923 return __lhs.compare(__rhs) >= 0; 924} 925 926 927template<class _CharT, class _Traits, int = 1> 928_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 929bool operator>=(basic_string_view<_CharT, _Traits> __lhs, 930 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT 931{ 932 return __lhs.compare(__rhs) >= 0; 933} 934 935template<class _CharT, class _Traits, int = 2> 936_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_INLINE_VISIBILITY 937bool operator>=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 938 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 939{ 940 return __lhs.compare(__rhs) >= 0; 941} 942 943#endif // _LIBCPP_STD_VER > 17 944 945template<class _CharT, class _Traits> 946_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& 947operator<<(basic_ostream<_CharT, _Traits>& __os, 948 basic_string_view<_CharT, _Traits> __str); 949 950// [string.view.hash] 951template<class _CharT> 952struct __string_view_hash : public __unary_function<basic_string_view<_CharT, char_traits<_CharT> >, size_t> 953{ 954 _LIBCPP_INLINE_VISIBILITY 955 size_t operator()(const basic_string_view<_CharT, char_traits<_CharT> > __val) const _NOEXCEPT { 956 return std::__do_string_hash(__val.data(), __val.data() + __val.size()); 957 } 958}; 959 960template <> 961struct hash<basic_string_view<char, char_traits<char> > > : __string_view_hash<char> {}; 962 963#ifndef _LIBCPP_HAS_NO_CHAR8_T 964template <> 965struct hash<basic_string_view<char8_t, char_traits<char8_t> > > : __string_view_hash<char8_t> {}; 966#endif 967 968template <> 969struct hash<basic_string_view<char16_t, char_traits<char16_t> > > : __string_view_hash<char16_t> {}; 970 971template <> 972struct hash<basic_string_view<char32_t, char_traits<char32_t> > > : __string_view_hash<char32_t> {}; 973 974#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 975template <> 976struct hash<basic_string_view<wchar_t, char_traits<wchar_t> > > : __string_view_hash<wchar_t> {}; 977#endif 978 979#if _LIBCPP_STD_VER > 11 980inline namespace literals 981{ 982 inline namespace string_view_literals 983 { 984 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 985 basic_string_view<char> operator "" sv(const char *__str, size_t __len) _NOEXCEPT 986 { 987 return basic_string_view<char> (__str, __len); 988 } 989 990#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 991 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 992 basic_string_view<wchar_t> operator "" sv(const wchar_t *__str, size_t __len) _NOEXCEPT 993 { 994 return basic_string_view<wchar_t> (__str, __len); 995 } 996#endif 997 998#ifndef _LIBCPP_HAS_NO_CHAR8_T 999 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1000 basic_string_view<char8_t> operator "" sv(const char8_t *__str, size_t __len) _NOEXCEPT 1001 { 1002 return basic_string_view<char8_t> (__str, __len); 1003 } 1004#endif 1005 1006 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1007 basic_string_view<char16_t> operator "" sv(const char16_t *__str, size_t __len) _NOEXCEPT 1008 { 1009 return basic_string_view<char16_t> (__str, __len); 1010 } 1011 1012 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1013 basic_string_view<char32_t> operator "" sv(const char32_t *__str, size_t __len) _NOEXCEPT 1014 { 1015 return basic_string_view<char32_t> (__str, __len); 1016 } 1017 } // namespace string_view_literals 1018} // namespace literals 1019#endif 1020_LIBCPP_END_NAMESPACE_STD 1021 1022_LIBCPP_POP_MACROS 1023 1024#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 1025# include <algorithm> 1026# include <concepts> 1027# include <functional> 1028# include <iterator> 1029#endif 1030 1031#endif // _LIBCPP_STRING_VIEW 1032