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> // all public C++ headers provide the assertion handler 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 <__memory/pointer_traits.h> 219#include <__ranges/concepts.h> 220#include <__ranges/data.h> 221#include <__ranges/enable_borrowed_range.h> 222#include <__ranges/enable_view.h> 223#include <__ranges/size.h> 224#include <__string/char_traits.h> 225#include <__type_traits/is_array.h> 226#include <__type_traits/is_convertible.h> 227#include <__type_traits/is_same.h> 228#include <__type_traits/is_standard_layout.h> 229#include <__type_traits/is_trivial.h> 230#include <__type_traits/remove_cvref.h> 231#include <__type_traits/remove_reference.h> 232#include <__type_traits/type_identity.h> 233#include <cstddef> 234#include <iosfwd> 235#include <limits> 236#include <stdexcept> 237#include <version> 238 239// standard-mandated includes 240 241// [iterator.range] 242#include <__iterator/access.h> 243#include <__iterator/data.h> 244#include <__iterator/empty.h> 245#include <__iterator/reverse_access.h> 246#include <__iterator/size.h> 247 248// [string.view.synop] 249#include <compare> 250 251#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 252# pragma GCC system_header 253#endif 254 255_LIBCPP_PUSH_MACROS 256#include <__undef_macros> 257 258_LIBCPP_BEGIN_NAMESPACE_STD 259 260// TODO: This is a workaround for some vendors to carry a downstream diff to accept `nullptr` in 261// string_view constructors. This can be refactored when this exact form isn't needed anymore. 262template <class _Traits> 263_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR inline size_t 264__char_traits_length_checked(const typename _Traits::char_type* __s) _NOEXCEPT { 265 // This needs to be a single statement for C++11 constexpr 266 return _LIBCPP_ASSERT_NON_NULL( 267 __s != nullptr, "null pointer passed to non-null argument of char_traits<...>::length"), 268 _Traits::length(__s); 269} 270 271template <class _CharT, class _Traits> 272class basic_string_view { 273public: 274 // types 275 using traits_type = _Traits; 276 using value_type = _CharT; 277 using pointer = _CharT*; 278 using const_pointer = const _CharT*; 279 using reference = _CharT&; 280 using const_reference = const _CharT&; 281#ifdef _LIBCPP_ABI_BOUNDED_ITERATORS 282 using const_iterator = __bounded_iter<const_pointer>; 283#else 284 using const_iterator = const_pointer; // See [string.view.iterators] 285#endif 286 using iterator = const_iterator; 287 using const_reverse_iterator = std::reverse_iterator<const_iterator>; 288 using reverse_iterator = const_reverse_iterator; 289 using size_type = size_t; 290 using difference_type = ptrdiff_t; 291 static _LIBCPP_CONSTEXPR const size_type npos = -1; // size_type(-1); 292 293 static_assert((!is_array<value_type>::value), "Character type of basic_string_view must not be an array"); 294 static_assert((is_standard_layout<value_type>::value), "Character type of basic_string_view must be standard-layout"); 295 static_assert((is_trivial<value_type>::value), "Character type of basic_string_view must be trivial"); 296 static_assert((is_same<_CharT, typename traits_type::char_type>::value), 297 "traits_type::char_type must be the same type as CharT"); 298 299 // [string.view.cons], construct/copy 300 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view() _NOEXCEPT : __data_(nullptr), __size_(0) {} 301 302 _LIBCPP_HIDE_FROM_ABI basic_string_view(const basic_string_view&) _NOEXCEPT = default; 303 304 _LIBCPP_HIDE_FROM_ABI basic_string_view& operator=(const basic_string_view&) _NOEXCEPT = default; 305 306 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT 307 : __data_(__s), 308 __size_(__len) { 309#if _LIBCPP_STD_VER >= 14 310 // This will result in creating an invalid `string_view` object -- some calculations involving `size` would 311 // overflow, making it effectively truncated. 312 _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN( 313 __len <= static_cast<size_type>(numeric_limits<difference_type>::max()), 314 "string_view::string_view(_CharT *, size_t): length does not fit in difference_type"); 315 _LIBCPP_ASSERT_NON_NULL( 316 __len == 0 || __s != nullptr, "string_view::string_view(_CharT *, size_t): received nullptr"); 317#endif 318 } 319 320#if _LIBCPP_STD_VER >= 20 321 template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 322 requires(is_same_v<iter_value_t<_It>, _CharT> && !is_convertible_v<_End, size_type>) 323 constexpr _LIBCPP_HIDE_FROM_ABI basic_string_view(_It __begin, _End __end) 324 : __data_(std::to_address(__begin)), __size_(__end - __begin) { 325 _LIBCPP_ASSERT_VALID_INPUT_RANGE( 326 (__end - __begin) >= 0, "std::string_view::string_view(iterator, sentinel) received invalid range"); 327 } 328#endif // _LIBCPP_STD_VER >= 20 329 330#if _LIBCPP_STD_VER >= 23 331 template <class _Range> 332 requires(!is_same_v<remove_cvref_t<_Range>, basic_string_view> && ranges::contiguous_range<_Range> && 333 ranges::sized_range<_Range> && is_same_v<ranges::range_value_t<_Range>, _CharT> && 334 !is_convertible_v<_Range, const _CharT*> && 335 (!requires(remove_cvref_t<_Range>& __d) { __d.operator std::basic_string_view<_CharT, _Traits>(); })) 336 constexpr explicit _LIBCPP_HIDE_FROM_ABI basic_string_view(_Range&& __r) 337 : __data_(ranges::data(__r)), __size_(ranges::size(__r)) {} 338#endif // _LIBCPP_STD_VER >= 23 339 340 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view(const _CharT* __s) 341 : __data_(__s), __size_(std::__char_traits_length_checked<_Traits>(__s)) {} 342 343#if _LIBCPP_STD_VER >= 23 344 basic_string_view(nullptr_t) = delete; 345#endif 346 347 // [string.view.iterators], iterators 348 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator begin() const _NOEXCEPT { return cbegin(); } 349 350 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator end() const _NOEXCEPT { return cend(); } 351 352 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator cbegin() const _NOEXCEPT { 353#ifdef _LIBCPP_ABI_BOUNDED_ITERATORS 354 return std::__make_bounded_iter(data(), data(), data() + size()); 355#else 356 return __data_; 357#endif 358 } 359 360 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator cend() const _NOEXCEPT { 361#ifdef _LIBCPP_ABI_BOUNDED_ITERATORS 362 return std::__make_bounded_iter(data() + size(), data(), data() + size()); 363#else 364 return __data_ + __size_; 365#endif 366 } 367 368 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rbegin() const _NOEXCEPT { 369 return const_reverse_iterator(cend()); 370 } 371 372 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rend() const _NOEXCEPT { 373 return const_reverse_iterator(cbegin()); 374 } 375 376 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crbegin() const _NOEXCEPT { 377 return const_reverse_iterator(cend()); 378 } 379 380 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crend() const _NOEXCEPT { 381 return const_reverse_iterator(cbegin()); 382 } 383 384 // [string.view.capacity], capacity 385 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI size_type size() const _NOEXCEPT { return __size_; } 386 387 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI size_type length() const _NOEXCEPT { return __size_; } 388 389 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI size_type max_size() const _NOEXCEPT { 390 return numeric_limits<size_type>::max() / sizeof(value_type); 391 } 392 393 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT { 394 return __size_ == 0; 395 } 396 397 // [string.view.access], element access 398 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference operator[](size_type __pos) const _NOEXCEPT { 399 return _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__pos < size(), "string_view[] index out of bounds"), __data_[__pos]; 400 } 401 402 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference at(size_type __pos) const { 403 return __pos >= size() ? (__throw_out_of_range("string_view::at"), __data_[0]) : __data_[__pos]; 404 } 405 406 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference front() const _NOEXCEPT { 407 return _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string_view::front(): string is empty"), __data_[0]; 408 } 409 410 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference back() const _NOEXCEPT { 411 return _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string_view::back(): string is empty"), __data_[__size_ - 1]; 412 } 413 414 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_pointer data() const _NOEXCEPT { return __data_; } 415 416 // [string.view.modifiers], modifiers: 417 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI void remove_prefix(size_type __n) _NOEXCEPT { 418 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n <= size(), "remove_prefix() can't remove more than size()"); 419 __data_ += __n; 420 __size_ -= __n; 421 } 422 423 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI void remove_suffix(size_type __n) _NOEXCEPT { 424 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n <= size(), "remove_suffix() can't remove more than size()"); 425 __size_ -= __n; 426 } 427 428 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI void swap(basic_string_view& __other) _NOEXCEPT { 429 const value_type* __p = __data_; 430 __data_ = __other.__data_; 431 __other.__data_ = __p; 432 433 size_type __sz = __size_; 434 __size_ = __other.__size_; 435 __other.__size_ = __sz; 436 } 437 438 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type 439 copy(_CharT* __s, size_type __n, size_type __pos = 0) const { 440 if (__pos > size()) 441 __throw_out_of_range("string_view::copy"); 442 size_type __rlen = std::min(__n, size() - __pos); 443 _Traits::copy(__s, data() + __pos, __rlen); 444 return __rlen; 445 } 446 447 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view substr(size_type __pos = 0, size_type __n = npos) const { 448 return __pos > size() ? (__throw_out_of_range("string_view::substr"), basic_string_view()) 449 : basic_string_view(data() + __pos, std::min(__n, size() - __pos)); 450 } 451 452 _LIBCPP_CONSTEXPR_SINCE_CXX14 int compare(basic_string_view __sv) const _NOEXCEPT { 453 size_type __rlen = std::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_HIDE_FROM_ABI int 461 compare(size_type __pos1, size_type __n1, basic_string_view __sv) const { 462 return substr(__pos1, __n1).compare(__sv); 463 } 464 465 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 466 compare(size_type __pos1, size_type __n1, basic_string_view __sv, size_type __pos2, size_type __n2) const { 467 return substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2)); 468 } 469 470 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int compare(const _CharT* __s) const _NOEXCEPT { 471 return compare(basic_string_view(__s)); 472 } 473 474 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 475 compare(size_type __pos1, size_type __n1, const _CharT* __s) const { 476 return substr(__pos1, __n1).compare(basic_string_view(__s)); 477 } 478 479 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 480 compare(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2) const { 481 return substr(__pos1, __n1).compare(basic_string_view(__s, __n2)); 482 } 483 484 // find 485 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 486 find(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 487 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 488 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __s.data(), __pos, __s.size()); 489 } 490 491 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type find(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 492 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 493 } 494 495 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 496 find(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 497 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find(): received nullptr"); 498 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 499 } 500 501 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 502 find(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 503 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find(): received nullptr"); 504 return std::__str_find<value_type, size_type, traits_type, npos>( 505 data(), size(), __s, __pos, traits_type::length(__s)); 506 } 507 508 // rfind 509 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 510 rfind(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 511 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 512 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __s.data(), __pos, __s.size()); 513 } 514 515 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 516 rfind(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 517 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 518 } 519 520 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 521 rfind(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 522 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::rfind(): received nullptr"); 523 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 524 } 525 526 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 527 rfind(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 528 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::rfind(): received nullptr"); 529 return std::__str_rfind<value_type, size_type, traits_type, npos>( 530 data(), size(), __s, __pos, traits_type::length(__s)); 531 } 532 533 // find_first_of 534 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 535 find_first_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 536 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_of(): received nullptr"); 537 return std::__str_find_first_of<value_type, size_type, traits_type, npos>( 538 data(), size(), __s.data(), __pos, __s.size()); 539 } 540 541 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 542 find_first_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 543 return find(__c, __pos); 544 } 545 546 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 547 find_first_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 548 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_first_of(): received nullptr"); 549 return std::__str_find_first_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 550 } 551 552 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 553 find_first_of(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 554 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_first_of(): received nullptr"); 555 return std::__str_find_first_of<value_type, size_type, traits_type, npos>( 556 data(), size(), __s, __pos, traits_type::length(__s)); 557 } 558 559 // find_last_of 560 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 561 find_last_of(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 562 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_of(): received nullptr"); 563 return std::__str_find_last_of<value_type, size_type, traits_type, npos>( 564 data(), size(), __s.data(), __pos, __s.size()); 565 } 566 567 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 568 find_last_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 569 return rfind(__c, __pos); 570 } 571 572 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 573 find_last_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 574 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_last_of(): received nullptr"); 575 return std::__str_find_last_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 576 } 577 578 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 579 find_last_of(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 580 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_last_of(): received nullptr"); 581 return std::__str_find_last_of<value_type, size_type, traits_type, npos>( 582 data(), size(), __s, __pos, traits_type::length(__s)); 583 } 584 585 // find_first_not_of 586 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 587 find_first_not_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 588 _LIBCPP_ASSERT_NON_NULL( 589 __s.size() == 0 || __s.data() != nullptr, "string_view::find_first_not_of(): received nullptr"); 590 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>( 591 data(), size(), __s.data(), __pos, __s.size()); 592 } 593 594 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 595 find_first_not_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 596 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 597 } 598 599 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 600 find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 601 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_first_not_of(): received nullptr"); 602 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 603 } 604 605 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 606 find_first_not_of(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 607 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_first_not_of(): received nullptr"); 608 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>( 609 data(), size(), __s, __pos, traits_type::length(__s)); 610 } 611 612 // find_last_not_of 613 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 614 find_last_not_of(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 615 _LIBCPP_ASSERT_NON_NULL( 616 __s.size() == 0 || __s.data() != nullptr, "string_view::find_last_not_of(): received nullptr"); 617 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>( 618 data(), size(), __s.data(), __pos, __s.size()); 619 } 620 621 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 622 find_last_not_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 623 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 624 } 625 626 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 627 find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 628 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_last_not_of(): received nullptr"); 629 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 630 } 631 632 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 633 find_last_not_of(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 634 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_last_not_of(): received nullptr"); 635 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>( 636 data(), size(), __s, __pos, traits_type::length(__s)); 637 } 638 639#if _LIBCPP_STD_VER >= 20 640 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(basic_string_view __s) const noexcept { 641 return size() >= __s.size() && compare(0, __s.size(), __s) == 0; 642 } 643 644 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(value_type __c) const noexcept { 645 return !empty() && _Traits::eq(front(), __c); 646 } 647 648 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(const value_type* __s) const noexcept { 649 return starts_with(basic_string_view(__s)); 650 } 651 652 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(basic_string_view __s) const noexcept { 653 return size() >= __s.size() && compare(size() - __s.size(), npos, __s) == 0; 654 } 655 656 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(value_type __c) const noexcept { 657 return !empty() && _Traits::eq(back(), __c); 658 } 659 660 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(const value_type* __s) const noexcept { 661 return ends_with(basic_string_view(__s)); 662 } 663#endif 664 665#if _LIBCPP_STD_VER >= 23 666 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(basic_string_view __sv) const noexcept { return find(__sv) != npos; } 667 668 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(value_type __c) const noexcept { return find(__c) != npos; } 669 670 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(const value_type* __s) const { return find(__s) != npos; } 671#endif 672 673private: 674 const value_type* __data_; 675 size_type __size_; 676}; 677_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(basic_string_view); 678 679#if _LIBCPP_STD_VER >= 20 680template <class _CharT, class _Traits> 681inline constexpr bool ranges::enable_view<basic_string_view<_CharT, _Traits>> = true; 682 683template <class _CharT, class _Traits> 684inline constexpr bool ranges::enable_borrowed_range<basic_string_view<_CharT, _Traits> > = true; 685#endif // _LIBCPP_STD_VER >= 20 686 687// [string.view.deduct] 688 689#if _LIBCPP_STD_VER >= 20 690template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 691basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>; 692#endif // _LIBCPP_STD_VER >= 20 693 694#if _LIBCPP_STD_VER >= 23 695template <ranges::contiguous_range _Range> 696basic_string_view(_Range) -> basic_string_view<ranges::range_value_t<_Range>>; 697#endif 698 699// [string.view.comparison] 700 701#if _LIBCPP_STD_VER >= 20 702 703template <class _CharT, class _Traits> 704_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(basic_string_view<_CharT, _Traits> __lhs, 705 type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) noexcept { 706 if (__lhs.size() != __rhs.size()) 707 return false; 708 return __lhs.compare(__rhs) == 0; 709} 710 711template <class _CharT, class _Traits> 712_LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(basic_string_view<_CharT, _Traits> __lhs, 713 type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) noexcept { 714 if constexpr (requires { typename _Traits::comparison_category; }) { 715 // [string.view]/4 716 static_assert( 717 __comparison_category<typename _Traits::comparison_category>, "return type is not a comparison category type"); 718 return static_cast<typename _Traits::comparison_category>(__lhs.compare(__rhs) <=> 0); 719 } else { 720 return static_cast<weak_ordering>(__lhs.compare(__rhs) <=> 0); 721 } 722} 723 724#else 725 726// operator == 727 728template <class _CharT, class _Traits> 729_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 730operator==(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 731 if (__lhs.size() != __rhs.size()) 732 return false; 733 return __lhs.compare(__rhs) == 0; 734} 735 736// The dummy default template parameters are used to work around a MSVC issue with mangling, see VSO-409326 for details. 737// This applies to the other sufficient overloads below for the other comparison operators. 738template <class _CharT, class _Traits, int = 1> 739_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 740operator==(basic_string_view<_CharT, _Traits> __lhs, 741 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 742 if (__lhs.size() != __rhs.size()) 743 return false; 744 return __lhs.compare(__rhs) == 0; 745} 746 747template <class _CharT, class _Traits, int = 2> 748_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 749operator==(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 750 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 751 if (__lhs.size() != __rhs.size()) 752 return false; 753 return __lhs.compare(__rhs) == 0; 754} 755 756// operator != 757template <class _CharT, class _Traits> 758_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 759operator!=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 760 if (__lhs.size() != __rhs.size()) 761 return true; 762 return __lhs.compare(__rhs) != 0; 763} 764 765template <class _CharT, class _Traits, int = 1> 766_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 767operator!=(basic_string_view<_CharT, _Traits> __lhs, 768 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 769 if (__lhs.size() != __rhs.size()) 770 return true; 771 return __lhs.compare(__rhs) != 0; 772} 773 774template <class _CharT, class _Traits, int = 2> 775_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 776operator!=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 777 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 778 if (__lhs.size() != __rhs.size()) 779 return true; 780 return __lhs.compare(__rhs) != 0; 781} 782 783// operator < 784template <class _CharT, class _Traits> 785_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 786operator<(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 787 return __lhs.compare(__rhs) < 0; 788} 789 790template <class _CharT, class _Traits, int = 1> 791_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 792operator<(basic_string_view<_CharT, _Traits> __lhs, 793 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 794 return __lhs.compare(__rhs) < 0; 795} 796 797template <class _CharT, class _Traits, int = 2> 798_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 799operator<(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 800 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 801 return __lhs.compare(__rhs) < 0; 802} 803 804// operator > 805template <class _CharT, class _Traits> 806_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 807operator>(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 808 return __lhs.compare(__rhs) > 0; 809} 810 811template <class _CharT, class _Traits, int = 1> 812_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 813operator>(basic_string_view<_CharT, _Traits> __lhs, 814 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 815 return __lhs.compare(__rhs) > 0; 816} 817 818template <class _CharT, class _Traits, int = 2> 819_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 820operator>(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 821 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 822 return __lhs.compare(__rhs) > 0; 823} 824 825// operator <= 826template <class _CharT, class _Traits> 827_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 828operator<=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 829 return __lhs.compare(__rhs) <= 0; 830} 831 832template <class _CharT, class _Traits, int = 1> 833_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 834operator<=(basic_string_view<_CharT, _Traits> __lhs, 835 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 836 return __lhs.compare(__rhs) <= 0; 837} 838 839template <class _CharT, class _Traits, int = 2> 840_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 841operator<=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 842 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 843 return __lhs.compare(__rhs) <= 0; 844} 845 846// operator >= 847template <class _CharT, class _Traits> 848_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 849operator>=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 850 return __lhs.compare(__rhs) >= 0; 851} 852 853template <class _CharT, class _Traits, int = 1> 854_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 855operator>=(basic_string_view<_CharT, _Traits> __lhs, 856 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 857 return __lhs.compare(__rhs) >= 0; 858} 859 860template <class _CharT, class _Traits, int = 2> 861_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 862operator>=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 863 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 864 return __lhs.compare(__rhs) >= 0; 865} 866 867#endif // _LIBCPP_STD_VER >= 20 868 869template <class _CharT, class _Traits> 870_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& 871operator<<(basic_ostream<_CharT, _Traits>& __os, basic_string_view<_CharT, _Traits> __str); 872 873// [string.view.hash] 874template <class _CharT> 875struct __string_view_hash : public __unary_function<basic_string_view<_CharT, char_traits<_CharT> >, size_t> { 876 _LIBCPP_HIDE_FROM_ABI size_t operator()(const basic_string_view<_CharT, char_traits<_CharT> > __val) const _NOEXCEPT { 877 return std::__do_string_hash(__val.data(), __val.data() + __val.size()); 878 } 879}; 880 881template <> 882struct hash<basic_string_view<char, char_traits<char> > > : __string_view_hash<char> {}; 883 884#ifndef _LIBCPP_HAS_NO_CHAR8_T 885template <> 886struct hash<basic_string_view<char8_t, char_traits<char8_t> > > : __string_view_hash<char8_t> {}; 887#endif 888 889template <> 890struct hash<basic_string_view<char16_t, char_traits<char16_t> > > : __string_view_hash<char16_t> {}; 891 892template <> 893struct hash<basic_string_view<char32_t, char_traits<char32_t> > > : __string_view_hash<char32_t> {}; 894 895#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 896template <> 897struct hash<basic_string_view<wchar_t, char_traits<wchar_t> > > : __string_view_hash<wchar_t> {}; 898#endif 899 900#if _LIBCPP_STD_VER >= 14 901inline namespace literals { 902inline namespace string_view_literals { 903inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR basic_string_view<char> 904operator""sv(const char* __str, size_t __len) _NOEXCEPT { 905 return basic_string_view<char>(__str, __len); 906} 907 908# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 909inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR basic_string_view<wchar_t> 910operator""sv(const wchar_t* __str, size_t __len) _NOEXCEPT { 911 return basic_string_view<wchar_t>(__str, __len); 912} 913# endif 914 915# ifndef _LIBCPP_HAS_NO_CHAR8_T 916inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR basic_string_view<char8_t> 917operator""sv(const char8_t* __str, size_t __len) _NOEXCEPT { 918 return basic_string_view<char8_t>(__str, __len); 919} 920# endif 921 922inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR basic_string_view<char16_t> 923operator""sv(const char16_t* __str, size_t __len) _NOEXCEPT { 924 return basic_string_view<char16_t>(__str, __len); 925} 926 927inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR basic_string_view<char32_t> 928operator""sv(const char32_t* __str, size_t __len) _NOEXCEPT { 929 return basic_string_view<char32_t>(__str, __len); 930} 931} // namespace string_view_literals 932} // namespace literals 933#endif 934_LIBCPP_END_NAMESPACE_STD 935 936_LIBCPP_POP_MACROS 937 938#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 939# include <algorithm> 940# include <concepts> 941# include <cstdlib> 942# include <iterator> 943# include <type_traits> 944#endif 945 946#endif // _LIBCPP_STRING_VIEW 947