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 // Use the `__assume_valid` form of the constructor to avoid an unnecessary check. Any substring of a view is a 452 // valid view. In particular, `size()` is known to be smaller than `numeric_limits<difference_type>::max()`, so the 453 // new size is also smaller. See also https://github.com/llvm/llvm-project/issues/91634. 454 return __pos > size() ? (__throw_out_of_range("string_view::substr"), basic_string_view()) 455 : basic_string_view(__assume_valid(), data() + __pos, std::min(__n, size() - __pos)); 456 } 457 458 _LIBCPP_CONSTEXPR_SINCE_CXX14 int compare(basic_string_view __sv) const _NOEXCEPT { 459 size_type __rlen = std::min(size(), __sv.size()); 460 int __retval = _Traits::compare(data(), __sv.data(), __rlen); 461 if (__retval == 0) // first __rlen chars matched 462 __retval = size() == __sv.size() ? 0 : (size() < __sv.size() ? -1 : 1); 463 return __retval; 464 } 465 466 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 467 compare(size_type __pos1, size_type __n1, basic_string_view __sv) const { 468 return substr(__pos1, __n1).compare(__sv); 469 } 470 471 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 472 compare(size_type __pos1, size_type __n1, basic_string_view __sv, size_type __pos2, size_type __n2) const { 473 return substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2)); 474 } 475 476 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int compare(const _CharT* __s) const _NOEXCEPT { 477 return compare(basic_string_view(__s)); 478 } 479 480 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 481 compare(size_type __pos1, size_type __n1, const _CharT* __s) const { 482 return substr(__pos1, __n1).compare(basic_string_view(__s)); 483 } 484 485 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 486 compare(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2) const { 487 return substr(__pos1, __n1).compare(basic_string_view(__s, __n2)); 488 } 489 490 // find 491 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 492 find(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 493 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 494 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __s.data(), __pos, __s.size()); 495 } 496 497 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type find(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 498 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 499 } 500 501 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 502 find(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 503 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find(): received nullptr"); 504 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 505 } 506 507 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 508 find(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 509 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find(): received nullptr"); 510 return std::__str_find<value_type, size_type, traits_type, npos>( 511 data(), size(), __s, __pos, traits_type::length(__s)); 512 } 513 514 // rfind 515 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 516 rfind(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 517 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 518 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __s.data(), __pos, __s.size()); 519 } 520 521 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 522 rfind(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 523 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 524 } 525 526 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 527 rfind(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 528 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::rfind(): received nullptr"); 529 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 530 } 531 532 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 533 rfind(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 534 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::rfind(): received nullptr"); 535 return std::__str_rfind<value_type, size_type, traits_type, npos>( 536 data(), size(), __s, __pos, traits_type::length(__s)); 537 } 538 539 // find_first_of 540 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 541 find_first_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 542 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_of(): received nullptr"); 543 return std::__str_find_first_of<value_type, size_type, traits_type, npos>( 544 data(), size(), __s.data(), __pos, __s.size()); 545 } 546 547 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 548 find_first_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 549 return find(__c, __pos); 550 } 551 552 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 553 find_first_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 554 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_first_of(): received nullptr"); 555 return std::__str_find_first_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 556 } 557 558 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 559 find_first_of(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 560 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_first_of(): received nullptr"); 561 return std::__str_find_first_of<value_type, size_type, traits_type, npos>( 562 data(), size(), __s, __pos, traits_type::length(__s)); 563 } 564 565 // find_last_of 566 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 567 find_last_of(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 568 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_of(): received nullptr"); 569 return std::__str_find_last_of<value_type, size_type, traits_type, npos>( 570 data(), size(), __s.data(), __pos, __s.size()); 571 } 572 573 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 574 find_last_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 575 return rfind(__c, __pos); 576 } 577 578 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 579 find_last_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 580 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_last_of(): received nullptr"); 581 return std::__str_find_last_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 582 } 583 584 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 585 find_last_of(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 586 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_last_of(): received nullptr"); 587 return std::__str_find_last_of<value_type, size_type, traits_type, npos>( 588 data(), size(), __s, __pos, traits_type::length(__s)); 589 } 590 591 // find_first_not_of 592 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 593 find_first_not_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 594 _LIBCPP_ASSERT_NON_NULL( 595 __s.size() == 0 || __s.data() != nullptr, "string_view::find_first_not_of(): received nullptr"); 596 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>( 597 data(), size(), __s.data(), __pos, __s.size()); 598 } 599 600 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 601 find_first_not_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 602 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 603 } 604 605 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 606 find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 607 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __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>(data(), size(), __s, __pos, __n); 609 } 610 611 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 612 find_first_not_of(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 613 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_first_not_of(): received nullptr"); 614 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>( 615 data(), size(), __s, __pos, traits_type::length(__s)); 616 } 617 618 // find_last_not_of 619 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 620 find_last_not_of(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 621 _LIBCPP_ASSERT_NON_NULL( 622 __s.size() == 0 || __s.data() != nullptr, "string_view::find_last_not_of(): received nullptr"); 623 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>( 624 data(), size(), __s.data(), __pos, __s.size()); 625 } 626 627 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 628 find_last_not_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 629 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 630 } 631 632 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 633 find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 634 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __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>(data(), size(), __s, __pos, __n); 636 } 637 638 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 639 find_last_not_of(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 640 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_last_not_of(): received nullptr"); 641 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>( 642 data(), size(), __s, __pos, traits_type::length(__s)); 643 } 644 645#if _LIBCPP_STD_VER >= 20 646 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(basic_string_view __s) const noexcept { 647 return size() >= __s.size() && compare(0, __s.size(), __s) == 0; 648 } 649 650 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(value_type __c) const noexcept { 651 return !empty() && _Traits::eq(front(), __c); 652 } 653 654 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(const value_type* __s) const noexcept { 655 return starts_with(basic_string_view(__s)); 656 } 657 658 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(basic_string_view __s) const noexcept { 659 return size() >= __s.size() && compare(size() - __s.size(), npos, __s) == 0; 660 } 661 662 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(value_type __c) const noexcept { 663 return !empty() && _Traits::eq(back(), __c); 664 } 665 666 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(const value_type* __s) const noexcept { 667 return ends_with(basic_string_view(__s)); 668 } 669#endif 670 671#if _LIBCPP_STD_VER >= 23 672 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(basic_string_view __sv) const noexcept { return find(__sv) != npos; } 673 674 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(value_type __c) const noexcept { return find(__c) != npos; } 675 676 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(const value_type* __s) const { return find(__s) != npos; } 677#endif 678 679private: 680 struct __assume_valid {}; 681 682 // This is the same as the pointer and length constructor, but without the additional hardening checks. It is intended 683 // for use within the class, when the class invariants already guarantee the resulting object is valid. The compiler 684 // usually cannot eliminate the redundant checks because it does not know class invariants. 685 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI 686 basic_string_view(__assume_valid, const _CharT* __s, size_type __len) _NOEXCEPT 687 : __data_(__s), 688 __size_(__len) {} 689 690 const value_type* __data_; 691 size_type __size_; 692}; 693_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(basic_string_view); 694 695#if _LIBCPP_STD_VER >= 20 696template <class _CharT, class _Traits> 697inline constexpr bool ranges::enable_view<basic_string_view<_CharT, _Traits>> = true; 698 699template <class _CharT, class _Traits> 700inline constexpr bool ranges::enable_borrowed_range<basic_string_view<_CharT, _Traits> > = true; 701#endif // _LIBCPP_STD_VER >= 20 702 703// [string.view.deduct] 704 705#if _LIBCPP_STD_VER >= 20 706template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 707basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>; 708#endif // _LIBCPP_STD_VER >= 20 709 710#if _LIBCPP_STD_VER >= 23 711template <ranges::contiguous_range _Range> 712basic_string_view(_Range) -> basic_string_view<ranges::range_value_t<_Range>>; 713#endif 714 715// [string.view.comparison] 716 717#if _LIBCPP_STD_VER >= 20 718 719template <class _CharT, class _Traits> 720_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(basic_string_view<_CharT, _Traits> __lhs, 721 type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) noexcept { 722 if (__lhs.size() != __rhs.size()) 723 return false; 724 return __lhs.compare(__rhs) == 0; 725} 726 727template <class _CharT, class _Traits> 728_LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(basic_string_view<_CharT, _Traits> __lhs, 729 type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) noexcept { 730 if constexpr (requires { typename _Traits::comparison_category; }) { 731 // [string.view]/4 732 static_assert( 733 __comparison_category<typename _Traits::comparison_category>, "return type is not a comparison category type"); 734 return static_cast<typename _Traits::comparison_category>(__lhs.compare(__rhs) <=> 0); 735 } else { 736 return static_cast<weak_ordering>(__lhs.compare(__rhs) <=> 0); 737 } 738} 739 740#else 741 742// operator == 743 744template <class _CharT, class _Traits> 745_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 746operator==(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 747 if (__lhs.size() != __rhs.size()) 748 return false; 749 return __lhs.compare(__rhs) == 0; 750} 751 752// The dummy default template parameters are used to work around a MSVC issue with mangling, see VSO-409326 for details. 753// This applies to the other sufficient overloads below for the other comparison operators. 754template <class _CharT, class _Traits, int = 1> 755_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 756operator==(basic_string_view<_CharT, _Traits> __lhs, 757 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 758 if (__lhs.size() != __rhs.size()) 759 return false; 760 return __lhs.compare(__rhs) == 0; 761} 762 763template <class _CharT, class _Traits, int = 2> 764_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 765operator==(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 766 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 767 if (__lhs.size() != __rhs.size()) 768 return false; 769 return __lhs.compare(__rhs) == 0; 770} 771 772// operator != 773template <class _CharT, class _Traits> 774_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 775operator!=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 776 if (__lhs.size() != __rhs.size()) 777 return true; 778 return __lhs.compare(__rhs) != 0; 779} 780 781template <class _CharT, class _Traits, int = 1> 782_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 783operator!=(basic_string_view<_CharT, _Traits> __lhs, 784 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 785 if (__lhs.size() != __rhs.size()) 786 return true; 787 return __lhs.compare(__rhs) != 0; 788} 789 790template <class _CharT, class _Traits, int = 2> 791_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 792operator!=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 793 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 794 if (__lhs.size() != __rhs.size()) 795 return true; 796 return __lhs.compare(__rhs) != 0; 797} 798 799// operator < 800template <class _CharT, class _Traits> 801_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 802operator<(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 803 return __lhs.compare(__rhs) < 0; 804} 805 806template <class _CharT, class _Traits, int = 1> 807_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 808operator<(basic_string_view<_CharT, _Traits> __lhs, 809 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 810 return __lhs.compare(__rhs) < 0; 811} 812 813template <class _CharT, class _Traits, int = 2> 814_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 815operator<(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 816 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 817 return __lhs.compare(__rhs) < 0; 818} 819 820// operator > 821template <class _CharT, class _Traits> 822_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 823operator>(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 824 return __lhs.compare(__rhs) > 0; 825} 826 827template <class _CharT, class _Traits, int = 1> 828_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 829operator>(basic_string_view<_CharT, _Traits> __lhs, 830 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 831 return __lhs.compare(__rhs) > 0; 832} 833 834template <class _CharT, class _Traits, int = 2> 835_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 836operator>(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 837 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 838 return __lhs.compare(__rhs) > 0; 839} 840 841// operator <= 842template <class _CharT, class _Traits> 843_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 844operator<=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 845 return __lhs.compare(__rhs) <= 0; 846} 847 848template <class _CharT, class _Traits, int = 1> 849_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 850operator<=(basic_string_view<_CharT, _Traits> __lhs, 851 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 852 return __lhs.compare(__rhs) <= 0; 853} 854 855template <class _CharT, class _Traits, int = 2> 856_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 857operator<=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 858 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 859 return __lhs.compare(__rhs) <= 0; 860} 861 862// operator >= 863template <class _CharT, class _Traits> 864_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 865operator>=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 866 return __lhs.compare(__rhs) >= 0; 867} 868 869template <class _CharT, class _Traits, int = 1> 870_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 871operator>=(basic_string_view<_CharT, _Traits> __lhs, 872 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 873 return __lhs.compare(__rhs) >= 0; 874} 875 876template <class _CharT, class _Traits, int = 2> 877_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 878operator>=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 879 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 880 return __lhs.compare(__rhs) >= 0; 881} 882 883#endif // _LIBCPP_STD_VER >= 20 884 885template <class _CharT, class _Traits> 886_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& 887operator<<(basic_ostream<_CharT, _Traits>& __os, basic_string_view<_CharT, _Traits> __str); 888 889// [string.view.hash] 890template <class _CharT> 891struct __string_view_hash : public __unary_function<basic_string_view<_CharT, char_traits<_CharT> >, size_t> { 892 _LIBCPP_HIDE_FROM_ABI size_t operator()(const basic_string_view<_CharT, char_traits<_CharT> > __val) const _NOEXCEPT { 893 return std::__do_string_hash(__val.data(), __val.data() + __val.size()); 894 } 895}; 896 897template <> 898struct hash<basic_string_view<char, char_traits<char> > > : __string_view_hash<char> {}; 899 900#ifndef _LIBCPP_HAS_NO_CHAR8_T 901template <> 902struct hash<basic_string_view<char8_t, char_traits<char8_t> > > : __string_view_hash<char8_t> {}; 903#endif 904 905template <> 906struct hash<basic_string_view<char16_t, char_traits<char16_t> > > : __string_view_hash<char16_t> {}; 907 908template <> 909struct hash<basic_string_view<char32_t, char_traits<char32_t> > > : __string_view_hash<char32_t> {}; 910 911#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 912template <> 913struct hash<basic_string_view<wchar_t, char_traits<wchar_t> > > : __string_view_hash<wchar_t> {}; 914#endif 915 916#if _LIBCPP_STD_VER >= 14 917inline namespace literals { 918inline namespace string_view_literals { 919inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char> operator""sv(const char* __str, size_t __len) noexcept { 920 return basic_string_view<char>(__str, __len); 921} 922 923# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 924inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<wchar_t> 925operator""sv(const wchar_t* __str, size_t __len) noexcept { 926 return basic_string_view<wchar_t>(__str, __len); 927} 928# endif 929 930# ifndef _LIBCPP_HAS_NO_CHAR8_T 931inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char8_t> 932operator""sv(const char8_t* __str, size_t __len) noexcept { 933 return basic_string_view<char8_t>(__str, __len); 934} 935# endif 936 937inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char16_t> 938operator""sv(const char16_t* __str, size_t __len) noexcept { 939 return basic_string_view<char16_t>(__str, __len); 940} 941 942inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char32_t> 943operator""sv(const char32_t* __str, size_t __len) noexcept { 944 return basic_string_view<char32_t>(__str, __len); 945} 946} // namespace string_view_literals 947} // namespace literals 948#endif 949_LIBCPP_END_NAMESPACE_STD 950 951_LIBCPP_POP_MACROS 952 953#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 954# include <algorithm> 955# include <concepts> 956# include <cstdlib> 957# include <iterator> 958# include <type_traits> 959#endif 960 961#endif // _LIBCPP_STRING_VIEW 962