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