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#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) 209# include <__cxx03/string_view> 210#else 211# include <__algorithm/min.h> 212# include <__assert> 213# include <__config> 214# include <__cstddef/nullptr_t.h> 215# include <__cstddef/ptrdiff_t.h> 216# include <__cstddef/size_t.h> 217# include <__functional/hash.h> 218# include <__functional/unary_function.h> 219# include <__fwd/ostream.h> 220# include <__fwd/string.h> 221# include <__fwd/string_view.h> 222# include <__iterator/bounded_iter.h> 223# include <__iterator/concepts.h> 224# include <__iterator/iterator_traits.h> 225# include <__iterator/reverse_iterator.h> 226# include <__iterator/wrap_iter.h> 227# include <__memory/pointer_traits.h> 228# include <__ranges/concepts.h> 229# include <__ranges/data.h> 230# include <__ranges/enable_borrowed_range.h> 231# include <__ranges/enable_view.h> 232# include <__ranges/size.h> 233# include <__string/char_traits.h> 234# include <__type_traits/is_array.h> 235# include <__type_traits/is_convertible.h> 236# include <__type_traits/is_same.h> 237# include <__type_traits/is_standard_layout.h> 238# include <__type_traits/is_trivial.h> 239# include <__type_traits/remove_cvref.h> 240# include <__type_traits/remove_reference.h> 241# include <__type_traits/type_identity.h> 242# include <iosfwd> 243# include <limits> 244# include <stdexcept> 245# include <version> 246 247// standard-mandated includes 248 249// [iterator.range] 250# include <__iterator/access.h> 251# include <__iterator/data.h> 252# include <__iterator/empty.h> 253# include <__iterator/reverse_access.h> 254# include <__iterator/size.h> 255 256// [string.view.synop] 257# include <compare> 258 259# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 260# pragma GCC system_header 261# endif 262 263_LIBCPP_PUSH_MACROS 264# include <__undef_macros> 265 266_LIBCPP_BEGIN_NAMESPACE_STD 267 268// TODO: This is a workaround for some vendors to carry a downstream diff to accept `nullptr` in 269// string_view constructors. This can be refactored when this exact form isn't needed anymore. 270template <class _Traits> 271_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR inline size_t 272__char_traits_length_checked(const typename _Traits::char_type* __s) _NOEXCEPT { 273 // This needs to be a single statement for C++11 constexpr 274 return _LIBCPP_ASSERT_NON_NULL( 275 __s != nullptr, "null pointer passed to non-null argument of char_traits<...>::length"), 276 _Traits::length(__s); 277} 278 279template <class _CharT, class _Traits> 280class basic_string_view { 281public: 282 // types 283 using traits_type = _Traits; 284 using value_type = _CharT; 285 using pointer = _CharT*; 286 using const_pointer = const _CharT*; 287 using reference = _CharT&; 288 using const_reference = const _CharT&; 289# if defined(_LIBCPP_ABI_BOUNDED_ITERATORS) 290 using const_iterator = __bounded_iter<const_pointer>; 291# elif defined(_LIBCPP_ABI_USE_WRAP_ITER_IN_STD_STRING_VIEW) 292 using const_iterator = __wrap_iter<const_pointer>; 293# else 294 using const_iterator = const_pointer; 295# endif 296 using iterator = const_iterator; 297 using const_reverse_iterator = std::reverse_iterator<const_iterator>; 298 using reverse_iterator = const_reverse_iterator; 299 using size_type = size_t; 300 using difference_type = ptrdiff_t; 301 static _LIBCPP_CONSTEXPR const size_type npos = -1; // size_type(-1); 302 303 static_assert(!is_array<value_type>::value, "Character type of basic_string_view must not be an array"); 304 static_assert(is_standard_layout<value_type>::value, "Character type of basic_string_view must be standard-layout"); 305 static_assert(is_trivial<value_type>::value, "Character type of basic_string_view must be trivial"); 306 static_assert(is_same<_CharT, typename traits_type::char_type>::value, 307 "traits_type::char_type must be the same type as CharT"); 308 309 // [string.view.cons], construct/copy 310 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view() _NOEXCEPT : __data_(nullptr), __size_(0) {} 311 312 _LIBCPP_HIDE_FROM_ABI basic_string_view(const basic_string_view&) _NOEXCEPT = default; 313 314 _LIBCPP_HIDE_FROM_ABI basic_string_view& operator=(const basic_string_view&) _NOEXCEPT = default; 315 316 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT 317 : __data_(__s), 318 __size_(__len) { 319# if _LIBCPP_STD_VER >= 14 320 // Allocations must fit in `ptrdiff_t` for pointer arithmetic to work. If `__len` exceeds it, the input 321 // range could not have been valid. Most likely the caller underflowed some arithmetic and inadvertently 322 // passed in a negative length. 323 _LIBCPP_ASSERT_VALID_INPUT_RANGE( 324 __len <= static_cast<size_type>(numeric_limits<difference_type>::max()), 325 "string_view::string_view(_CharT *, size_t): length does not fit in difference_type"); 326 _LIBCPP_ASSERT_NON_NULL( 327 __len == 0 || __s != nullptr, "string_view::string_view(_CharT *, size_t): received nullptr"); 328# endif 329 } 330 331# if _LIBCPP_STD_VER >= 20 332 template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 333 requires(is_same_v<iter_value_t<_It>, _CharT> && !is_convertible_v<_End, size_type>) 334 constexpr _LIBCPP_HIDE_FROM_ABI basic_string_view(_It __begin, _End __end) 335 : __data_(std::to_address(__begin)), __size_(__end - __begin) { 336 _LIBCPP_ASSERT_VALID_INPUT_RANGE( 337 (__end - __begin) >= 0, "std::string_view::string_view(iterator, sentinel) received invalid range"); 338 } 339# endif // _LIBCPP_STD_VER >= 20 340 341# if _LIBCPP_STD_VER >= 23 342 template <class _Range> 343 requires(!is_same_v<remove_cvref_t<_Range>, basic_string_view> && ranges::contiguous_range<_Range> && 344 ranges::sized_range<_Range> && is_same_v<ranges::range_value_t<_Range>, _CharT> && 345 !is_convertible_v<_Range, const _CharT*> && 346 (!requires(remove_cvref_t<_Range>& __d) { __d.operator std::basic_string_view<_CharT, _Traits>(); })) 347 constexpr explicit _LIBCPP_HIDE_FROM_ABI basic_string_view(_Range&& __r) 348 : __data_(ranges::data(__r)), __size_(ranges::size(__r)) {} 349# endif // _LIBCPP_STD_VER >= 23 350 351 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view(const _CharT* __s) 352 : __data_(__s), __size_(std::__char_traits_length_checked<_Traits>(__s)) {} 353 354# if _LIBCPP_STD_VER >= 23 355 basic_string_view(nullptr_t) = delete; 356# endif 357 358 // [string.view.iterators], iterators 359 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator begin() const _NOEXCEPT { return cbegin(); } 360 361 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator end() const _NOEXCEPT { return cend(); } 362 363 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator cbegin() const _NOEXCEPT { 364# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS 365 return std::__make_bounded_iter(data(), data(), data() + size()); 366# else 367 return const_iterator(__data_); 368# endif 369 } 370 371 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator cend() const _NOEXCEPT { 372# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS 373 return std::__make_bounded_iter(data() + size(), data(), data() + size()); 374# else 375 return const_iterator(__data_ + __size_); 376# endif 377 } 378 379 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rbegin() const _NOEXCEPT { 380 return const_reverse_iterator(cend()); 381 } 382 383 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rend() const _NOEXCEPT { 384 return const_reverse_iterator(cbegin()); 385 } 386 387 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crbegin() const _NOEXCEPT { 388 return const_reverse_iterator(cend()); 389 } 390 391 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crend() const _NOEXCEPT { 392 return const_reverse_iterator(cbegin()); 393 } 394 395 // [string.view.capacity], capacity 396 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI size_type size() const _NOEXCEPT { return __size_; } 397 398 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI size_type length() const _NOEXCEPT { return __size_; } 399 400 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI size_type max_size() const _NOEXCEPT { 401 return numeric_limits<size_type>::max() / sizeof(value_type); 402 } 403 404 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT { return __size_ == 0; } 405 406 // [string.view.access], element access 407 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference operator[](size_type __pos) const _NOEXCEPT { 408 return _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__pos < size(), "string_view[] index out of bounds"), __data_[__pos]; 409 } 410 411 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference at(size_type __pos) const { 412 return __pos >= size() ? (__throw_out_of_range("string_view::at"), __data_[0]) : __data_[__pos]; 413 } 414 415 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference front() const _NOEXCEPT { 416 return _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string_view::front(): string is empty"), __data_[0]; 417 } 418 419 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference back() const _NOEXCEPT { 420 return _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string_view::back(): string is empty"), __data_[__size_ - 1]; 421 } 422 423 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_pointer data() const _NOEXCEPT { return __data_; } 424 425 // [string.view.modifiers], modifiers: 426 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI void remove_prefix(size_type __n) _NOEXCEPT { 427 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n <= size(), "remove_prefix() can't remove more than size()"); 428 __data_ += __n; 429 __size_ -= __n; 430 } 431 432 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI void remove_suffix(size_type __n) _NOEXCEPT { 433 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n <= size(), "remove_suffix() can't remove more than size()"); 434 __size_ -= __n; 435 } 436 437 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI void swap(basic_string_view& __other) _NOEXCEPT { 438 const value_type* __p = __data_; 439 __data_ = __other.__data_; 440 __other.__data_ = __p; 441 442 size_type __sz = __size_; 443 __size_ = __other.__size_; 444 __other.__size_ = __sz; 445 } 446 447 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type 448 copy(_CharT* __s, size_type __n, size_type __pos = 0) const { 449 if (__pos > size()) 450 __throw_out_of_range("string_view::copy"); 451 size_type __rlen = std::min(__n, size() - __pos); 452 _Traits::copy(__s, data() + __pos, __rlen); 453 return __rlen; 454 } 455 456 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view substr(size_type __pos = 0, size_type __n = npos) const { 457 // Use the `__assume_valid` form of the constructor to avoid an unnecessary check. Any substring of a view is a 458 // valid view. In particular, `size()` is known to be smaller than `numeric_limits<difference_type>::max()`, so the 459 // new size is also smaller. See also https://github.com/llvm/llvm-project/issues/91634. 460 return __pos > size() ? (__throw_out_of_range("string_view::substr"), basic_string_view()) 461 : basic_string_view(__assume_valid(), data() + __pos, std::min(__n, size() - __pos)); 462 } 463 464 _LIBCPP_CONSTEXPR_SINCE_CXX14 int compare(basic_string_view __sv) const _NOEXCEPT { 465 size_type __rlen = std::min(size(), __sv.size()); 466 int __retval = _Traits::compare(data(), __sv.data(), __rlen); 467 if (__retval == 0) // first __rlen chars matched 468 __retval = size() == __sv.size() ? 0 : (size() < __sv.size() ? -1 : 1); 469 return __retval; 470 } 471 472 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 473 compare(size_type __pos1, size_type __n1, basic_string_view __sv) const { 474 return substr(__pos1, __n1).compare(__sv); 475 } 476 477 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 478 compare(size_type __pos1, size_type __n1, basic_string_view __sv, size_type __pos2, size_type __n2) const { 479 return substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2)); 480 } 481 482 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int compare(const _CharT* __s) const _NOEXCEPT { 483 return compare(basic_string_view(__s)); 484 } 485 486 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 487 compare(size_type __pos1, size_type __n1, const _CharT* __s) const { 488 return substr(__pos1, __n1).compare(basic_string_view(__s)); 489 } 490 491 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 492 compare(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2) const { 493 return substr(__pos1, __n1).compare(basic_string_view(__s, __n2)); 494 } 495 496 // find 497 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 498 find(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 499 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 500 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __s.data(), __pos, __s.size()); 501 } 502 503 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type find(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 504 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 505 } 506 507 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 508 find(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 509 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find(): received nullptr"); 510 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 511 } 512 513 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 514 find(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 515 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find(): received nullptr"); 516 return std::__str_find<value_type, size_type, traits_type, npos>( 517 data(), size(), __s, __pos, traits_type::length(__s)); 518 } 519 520 // rfind 521 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 522 rfind(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 523 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 524 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __s.data(), __pos, __s.size()); 525 } 526 527 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 528 rfind(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 529 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 530 } 531 532 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 533 rfind(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 534 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::rfind(): received nullptr"); 535 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 536 } 537 538 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 539 rfind(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 540 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::rfind(): received nullptr"); 541 return std::__str_rfind<value_type, size_type, traits_type, npos>( 542 data(), size(), __s, __pos, traits_type::length(__s)); 543 } 544 545 // find_first_of 546 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 547 find_first_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 548 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_of(): received nullptr"); 549 return std::__str_find_first_of<value_type, size_type, traits_type, npos>( 550 data(), size(), __s.data(), __pos, __s.size()); 551 } 552 553 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 554 find_first_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 555 return find(__c, __pos); 556 } 557 558 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 559 find_first_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 560 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_first_of(): received nullptr"); 561 return std::__str_find_first_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 562 } 563 564 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 565 find_first_of(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 566 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_first_of(): received nullptr"); 567 return std::__str_find_first_of<value_type, size_type, traits_type, npos>( 568 data(), size(), __s, __pos, traits_type::length(__s)); 569 } 570 571 // find_last_of 572 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 573 find_last_of(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 574 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_of(): received nullptr"); 575 return std::__str_find_last_of<value_type, size_type, traits_type, npos>( 576 data(), size(), __s.data(), __pos, __s.size()); 577 } 578 579 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 580 find_last_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 581 return rfind(__c, __pos); 582 } 583 584 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 585 find_last_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 586 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_last_of(): received nullptr"); 587 return std::__str_find_last_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 588 } 589 590 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 591 find_last_of(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 592 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_last_of(): received nullptr"); 593 return std::__str_find_last_of<value_type, size_type, traits_type, npos>( 594 data(), size(), __s, __pos, traits_type::length(__s)); 595 } 596 597 // find_first_not_of 598 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 599 find_first_not_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 600 _LIBCPP_ASSERT_NON_NULL( 601 __s.size() == 0 || __s.data() != nullptr, "string_view::find_first_not_of(): received nullptr"); 602 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>( 603 data(), size(), __s.data(), __pos, __s.size()); 604 } 605 606 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 607 find_first_not_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 608 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 609 } 610 611 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 612 find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 613 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __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>(data(), size(), __s, __pos, __n); 615 } 616 617 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 618 find_first_not_of(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 619 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_first_not_of(): received nullptr"); 620 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>( 621 data(), size(), __s, __pos, traits_type::length(__s)); 622 } 623 624 // find_last_not_of 625 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 626 find_last_not_of(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 627 _LIBCPP_ASSERT_NON_NULL( 628 __s.size() == 0 || __s.data() != nullptr, "string_view::find_last_not_of(): received nullptr"); 629 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>( 630 data(), size(), __s.data(), __pos, __s.size()); 631 } 632 633 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 634 find_last_not_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 635 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 636 } 637 638 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 639 find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 640 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __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>(data(), size(), __s, __pos, __n); 642 } 643 644 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 645 find_last_not_of(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 646 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_last_not_of(): received nullptr"); 647 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>( 648 data(), size(), __s, __pos, traits_type::length(__s)); 649 } 650 651# if _LIBCPP_STD_VER >= 20 652 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(basic_string_view __s) const noexcept { 653 return size() >= __s.size() && compare(0, __s.size(), __s) == 0; 654 } 655 656 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(value_type __c) const noexcept { 657 return !empty() && _Traits::eq(front(), __c); 658 } 659 660 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(const value_type* __s) const noexcept { 661 return starts_with(basic_string_view(__s)); 662 } 663 664 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(basic_string_view __s) const noexcept { 665 return size() >= __s.size() && compare(size() - __s.size(), npos, __s) == 0; 666 } 667 668 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(value_type __c) const noexcept { 669 return !empty() && _Traits::eq(back(), __c); 670 } 671 672 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(const value_type* __s) const noexcept { 673 return ends_with(basic_string_view(__s)); 674 } 675# endif 676 677# if _LIBCPP_STD_VER >= 23 678 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(basic_string_view __sv) const noexcept { return find(__sv) != npos; } 679 680 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(value_type __c) const noexcept { return find(__c) != npos; } 681 682 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(const value_type* __s) const { return find(__s) != npos; } 683# endif 684 685private: 686 struct __assume_valid {}; 687 688 // This is the same as the pointer and length constructor, but without the additional hardening checks. It is intended 689 // for use within the class, when the class invariants already guarantee the resulting object is valid. The compiler 690 // usually cannot eliminate the redundant checks because it does not know class invariants. 691 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI 692 basic_string_view(__assume_valid, const _CharT* __s, size_type __len) _NOEXCEPT 693 : __data_(__s), 694 __size_(__len) {} 695 696 const value_type* __data_; 697 size_type __size_; 698 699 template <class, class, class> 700 friend class basic_string; 701}; 702_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(basic_string_view); 703 704# if _LIBCPP_STD_VER >= 20 705template <class _CharT, class _Traits> 706inline constexpr bool ranges::enable_view<basic_string_view<_CharT, _Traits>> = true; 707 708template <class _CharT, class _Traits> 709inline constexpr bool ranges::enable_borrowed_range<basic_string_view<_CharT, _Traits> > = true; 710# endif // _LIBCPP_STD_VER >= 20 711 712// [string.view.deduct] 713 714# if _LIBCPP_STD_VER >= 20 715template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 716basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>; 717# endif // _LIBCPP_STD_VER >= 20 718 719# if _LIBCPP_STD_VER >= 23 720template <ranges::contiguous_range _Range> 721basic_string_view(_Range) -> basic_string_view<ranges::range_value_t<_Range>>; 722# endif 723 724// [string.view.comparison] 725 726// The dummy default template parameters are used to work around a MSVC issue with mangling, see VSO-409326 for details. 727// This applies to the other sufficient overloads below for the other comparison operators. 728template <class _CharT, class _Traits, int = 1> 729_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 730operator==(basic_string_view<_CharT, _Traits> __lhs, 731 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 732 if (__lhs.size() != __rhs.size()) 733 return false; 734 return __lhs.compare(__rhs) == 0; 735} 736 737# if _LIBCPP_STD_VER >= 20 738 739template <class _CharT, class _Traits> 740_LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(basic_string_view<_CharT, _Traits> __lhs, 741 type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) noexcept { 742 if constexpr (requires { typename _Traits::comparison_category; }) { 743 // [string.view]/4 744 static_assert( 745 __comparison_category<typename _Traits::comparison_category>, "return type is not a comparison category type"); 746 return static_cast<typename _Traits::comparison_category>(__lhs.compare(__rhs) <=> 0); 747 } else { 748 return static_cast<weak_ordering>(__lhs.compare(__rhs) <=> 0); 749 } 750} 751 752# else 753 754// operator == 755 756template <class _CharT, class _Traits> 757_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 758operator==(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 759 if (__lhs.size() != __rhs.size()) 760 return false; 761 return __lhs.compare(__rhs) == 0; 762} 763 764template <class _CharT, class _Traits, int = 2> 765_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 766operator==(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 767 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 768 return __lhs == __rhs; 769} 770 771// operator != 772template <class _CharT, class _Traits> 773_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 774operator!=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 775 return !(__lhs == __rhs); 776} 777 778template <class _CharT, class _Traits, int = 1> 779_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 780operator!=(basic_string_view<_CharT, _Traits> __lhs, 781 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 782 return !(__lhs == __rhs); 783} 784 785template <class _CharT, class _Traits, int = 2> 786_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 787operator!=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 788 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 789 return !(__lhs == __rhs); 790} 791 792// operator < 793template <class _CharT, class _Traits> 794_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 795operator<(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 796 return __lhs.compare(__rhs) < 0; 797} 798 799template <class _CharT, class _Traits, int = 1> 800_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 801operator<(basic_string_view<_CharT, _Traits> __lhs, 802 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 803 return __lhs.compare(__rhs) < 0; 804} 805 806template <class _CharT, class _Traits, int = 2> 807_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 808operator<(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 809 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 810 return __lhs.compare(__rhs) < 0; 811} 812 813// operator > 814template <class _CharT, class _Traits> 815_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 816operator>(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 817 return __lhs.compare(__rhs) > 0; 818} 819 820template <class _CharT, class _Traits, int = 1> 821_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 822operator>(basic_string_view<_CharT, _Traits> __lhs, 823 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 824 return __lhs.compare(__rhs) > 0; 825} 826 827template <class _CharT, class _Traits, int = 2> 828_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 829operator>(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 830 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 831 return __lhs.compare(__rhs) > 0; 832} 833 834// operator <= 835template <class _CharT, class _Traits> 836_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 837operator<=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 838 return __lhs.compare(__rhs) <= 0; 839} 840 841template <class _CharT, class _Traits, int = 1> 842_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 843operator<=(basic_string_view<_CharT, _Traits> __lhs, 844 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 845 return __lhs.compare(__rhs) <= 0; 846} 847 848template <class _CharT, class _Traits, int = 2> 849_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 850operator<=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 851 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 852 return __lhs.compare(__rhs) <= 0; 853} 854 855// operator >= 856template <class _CharT, class _Traits> 857_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 858operator>=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 859 return __lhs.compare(__rhs) >= 0; 860} 861 862template <class _CharT, class _Traits, int = 1> 863_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 864operator>=(basic_string_view<_CharT, _Traits> __lhs, 865 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 866 return __lhs.compare(__rhs) >= 0; 867} 868 869template <class _CharT, class _Traits, int = 2> 870_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 871operator>=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 872 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 873 return __lhs.compare(__rhs) >= 0; 874} 875 876# endif // _LIBCPP_STD_VER >= 20 877 878template <class _CharT, class _Traits> 879_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& 880operator<<(basic_ostream<_CharT, _Traits>& __os, basic_string_view<_CharT, _Traits> __str); 881 882// [string.view.hash] 883template <class _CharT> 884struct __string_view_hash : public __unary_function<basic_string_view<_CharT, char_traits<_CharT> >, size_t> { 885 _LIBCPP_HIDE_FROM_ABI size_t operator()(const basic_string_view<_CharT, char_traits<_CharT> > __val) const _NOEXCEPT { 886 return std::__do_string_hash(__val.data(), __val.data() + __val.size()); 887 } 888}; 889 890template <> 891struct hash<basic_string_view<char, char_traits<char> > > : __string_view_hash<char> {}; 892 893# if _LIBCPP_HAS_CHAR8_T 894template <> 895struct hash<basic_string_view<char8_t, char_traits<char8_t> > > : __string_view_hash<char8_t> {}; 896# endif 897 898template <> 899struct hash<basic_string_view<char16_t, char_traits<char16_t> > > : __string_view_hash<char16_t> {}; 900 901template <> 902struct hash<basic_string_view<char32_t, char_traits<char32_t> > > : __string_view_hash<char32_t> {}; 903 904# if _LIBCPP_HAS_WIDE_CHARACTERS 905template <> 906struct hash<basic_string_view<wchar_t, char_traits<wchar_t> > > : __string_view_hash<wchar_t> {}; 907# endif 908 909# if _LIBCPP_STD_VER >= 14 910inline namespace literals { 911inline namespace string_view_literals { 912inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char> operator""sv(const char* __str, size_t __len) noexcept { 913 return basic_string_view<char>(__str, __len); 914} 915 916# if _LIBCPP_HAS_WIDE_CHARACTERS 917inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<wchar_t> 918operator""sv(const wchar_t* __str, size_t __len) noexcept { 919 return basic_string_view<wchar_t>(__str, __len); 920} 921# endif 922 923# if _LIBCPP_HAS_CHAR8_T 924inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char8_t> 925operator""sv(const char8_t* __str, size_t __len) noexcept { 926 return basic_string_view<char8_t>(__str, __len); 927} 928# endif 929 930inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char16_t> 931operator""sv(const char16_t* __str, size_t __len) noexcept { 932 return basic_string_view<char16_t>(__str, __len); 933} 934 935inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char32_t> 936operator""sv(const char32_t* __str, size_t __len) noexcept { 937 return basic_string_view<char32_t>(__str, __len); 938} 939} // namespace string_view_literals 940} // namespace literals 941# endif 942_LIBCPP_END_NAMESPACE_STD 943 944_LIBCPP_POP_MACROS 945 946# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 947# include <algorithm> 948# include <concepts> 949# include <cstdlib> 950# include <iterator> 951# include <type_traits> 952# endif 953#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) 954 955#endif // _LIBCPP_STRING_VIEW 956