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