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_trivially_constructible.h> 239# include <__type_traits/is_trivially_copyable.h> 240# include <__type_traits/remove_cvref.h> 241# include <__type_traits/remove_reference.h> 242# include <__type_traits/type_identity.h> 243# include <iosfwd> 244# include <limits> 245# include <stdexcept> 246# include <version> 247 248// standard-mandated includes 249 250// [iterator.range] 251# include <__iterator/access.h> 252# include <__iterator/data.h> 253# include <__iterator/empty.h> 254# include <__iterator/reverse_access.h> 255# include <__iterator/size.h> 256 257// [string.view.synop] 258# include <compare> 259 260# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 261# pragma GCC system_header 262# endif 263 264_LIBCPP_PUSH_MACROS 265# include <__undef_macros> 266 267_LIBCPP_BEGIN_NAMESPACE_STD 268 269// TODO: This is a workaround for some vendors to carry a downstream diff to accept `nullptr` in 270// string_view constructors. This can be refactored when this exact form isn't needed anymore. 271template <class _Traits> 272_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR inline size_t 273__char_traits_length_checked(const typename _Traits::char_type* __s) _NOEXCEPT { 274 // This needs to be a single statement for C++11 constexpr 275 return _LIBCPP_ASSERT_NON_NULL( 276 __s != nullptr, "null pointer passed to non-null argument of char_traits<...>::length"), 277 _Traits::length(__s); 278} 279 280template <class _CharT, class _Traits> 281class basic_string_view { 282public: 283 // types 284 using traits_type = _Traits; 285 using value_type = _CharT; 286 using pointer = _CharT*; 287 using const_pointer = const _CharT*; 288 using reference = _CharT&; 289 using const_reference = const _CharT&; 290# if defined(_LIBCPP_ABI_BOUNDED_ITERATORS) 291 using const_iterator = __bounded_iter<const_pointer>; 292# elif defined(_LIBCPP_ABI_USE_WRAP_ITER_IN_STD_STRING_VIEW) 293 using const_iterator = __wrap_iter<const_pointer>; 294# else 295 using const_iterator = const_pointer; 296# endif 297 using iterator = const_iterator; 298 using const_reverse_iterator = std::reverse_iterator<const_iterator>; 299 using reverse_iterator = const_reverse_iterator; 300 using size_type = size_t; 301 using difference_type = ptrdiff_t; 302 static _LIBCPP_CONSTEXPR const size_type npos = -1; // size_type(-1); 303 304 static_assert(!is_array<value_type>::value, "Character type of basic_string_view must not be an array"); 305 static_assert(is_standard_layout<value_type>::value, "Character type of basic_string_view must be standard-layout"); 306 static_assert(is_trivially_default_constructible<value_type>::value, 307 "Character type of basic_string_view must be trivially default constructible"); 308 static_assert(is_trivially_copyable<value_type>::value, 309 "Character type of basic_string_view must be trivially copyable"); 310 static_assert(is_same<_CharT, typename traits_type::char_type>::value, 311 "traits_type::char_type must be the same type as CharT"); 312 313 // [string.view.cons], construct/copy 314 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view() _NOEXCEPT : __data_(nullptr), __size_(0) {} 315 316 _LIBCPP_HIDE_FROM_ABI basic_string_view(const basic_string_view&) _NOEXCEPT = default; 317 318 _LIBCPP_HIDE_FROM_ABI basic_string_view& operator=(const basic_string_view&) _NOEXCEPT = default; 319 320 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT 321 : __data_(__s), 322 __size_(__len) { 323# if _LIBCPP_STD_VER >= 14 324 // Allocations must fit in `ptrdiff_t` for pointer arithmetic to work. If `__len` exceeds it, the input 325 // range could not have been valid. Most likely the caller underflowed some arithmetic and inadvertently 326 // passed in a negative length. 327 _LIBCPP_ASSERT_VALID_INPUT_RANGE( 328 __len <= static_cast<size_type>(numeric_limits<difference_type>::max()), 329 "string_view::string_view(_CharT *, size_t): length does not fit in difference_type"); 330 _LIBCPP_ASSERT_NON_NULL( 331 __len == 0 || __s != nullptr, "string_view::string_view(_CharT *, size_t): received nullptr"); 332# endif 333 } 334 335# if _LIBCPP_STD_VER >= 20 336 template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 337 requires(is_same_v<iter_value_t<_It>, _CharT> && !is_convertible_v<_End, size_type>) 338 constexpr _LIBCPP_HIDE_FROM_ABI basic_string_view(_It __begin, _End __end) 339 : __data_(std::to_address(__begin)), __size_(__end - __begin) { 340 _LIBCPP_ASSERT_VALID_INPUT_RANGE( 341 (__end - __begin) >= 0, "std::string_view::string_view(iterator, sentinel) received invalid range"); 342 } 343# endif // _LIBCPP_STD_VER >= 20 344 345# if _LIBCPP_STD_VER >= 23 346 template <class _Range> 347 requires(!is_same_v<remove_cvref_t<_Range>, basic_string_view> && ranges::contiguous_range<_Range> && 348 ranges::sized_range<_Range> && is_same_v<ranges::range_value_t<_Range>, _CharT> && 349 !is_convertible_v<_Range, const _CharT*> && 350 (!requires(remove_cvref_t<_Range>& __d) { __d.operator std::basic_string_view<_CharT, _Traits>(); })) 351 constexpr explicit _LIBCPP_HIDE_FROM_ABI basic_string_view(_Range&& __r) 352 : __data_(ranges::data(__r)), __size_(ranges::size(__r)) {} 353# endif // _LIBCPP_STD_VER >= 23 354 355 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view(const _CharT* __s) 356 : __data_(__s), __size_(std::__char_traits_length_checked<_Traits>(__s)) {} 357 358# if _LIBCPP_STD_VER >= 23 359 basic_string_view(nullptr_t) = delete; 360# endif 361 362 // [string.view.iterators], iterators 363 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator begin() const _NOEXCEPT { return cbegin(); } 364 365 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator end() const _NOEXCEPT { return cend(); } 366 367 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator cbegin() const _NOEXCEPT { 368# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS 369 return std::__make_bounded_iter(data(), data(), data() + size()); 370# else 371 return const_iterator(__data_); 372# endif 373 } 374 375 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_iterator cend() const _NOEXCEPT { 376# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS 377 return std::__make_bounded_iter(data() + size(), data(), data() + size()); 378# else 379 return const_iterator(__data_ + __size_); 380# endif 381 } 382 383 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rbegin() const _NOEXCEPT { 384 return const_reverse_iterator(cend()); 385 } 386 387 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rend() const _NOEXCEPT { 388 return const_reverse_iterator(cbegin()); 389 } 390 391 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crbegin() const _NOEXCEPT { 392 return const_reverse_iterator(cend()); 393 } 394 395 _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crend() const _NOEXCEPT { 396 return const_reverse_iterator(cbegin()); 397 } 398 399 // [string.view.capacity], capacity 400 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI size_type size() const _NOEXCEPT { return __size_; } 401 402 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI size_type length() const _NOEXCEPT { return __size_; } 403 404 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI size_type max_size() const _NOEXCEPT { 405 return numeric_limits<size_type>::max() / sizeof(value_type); 406 } 407 408 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT { return __size_ == 0; } 409 410 // [string.view.access], element access 411 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference operator[](size_type __pos) const _NOEXCEPT { 412 return _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__pos < size(), "string_view[] index out of bounds"), __data_[__pos]; 413 } 414 415 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference at(size_type __pos) const { 416 return __pos >= size() ? (__throw_out_of_range("string_view::at"), __data_[0]) : __data_[__pos]; 417 } 418 419 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference front() const _NOEXCEPT { 420 return _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string_view::front(): string is empty"), __data_[0]; 421 } 422 423 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_reference back() const _NOEXCEPT { 424 return _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string_view::back(): string is empty"), __data_[__size_ - 1]; 425 } 426 427 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI const_pointer data() const _NOEXCEPT { return __data_; } 428 429 // [string.view.modifiers], modifiers: 430 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI void remove_prefix(size_type __n) _NOEXCEPT { 431 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n <= size(), "remove_prefix() can't remove more than size()"); 432 __data_ += __n; 433 __size_ -= __n; 434 } 435 436 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI void remove_suffix(size_type __n) _NOEXCEPT { 437 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n <= size(), "remove_suffix() can't remove more than size()"); 438 __size_ -= __n; 439 } 440 441 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI void swap(basic_string_view& __other) _NOEXCEPT { 442 const value_type* __p = __data_; 443 __data_ = __other.__data_; 444 __other.__data_ = __p; 445 446 size_type __sz = __size_; 447 __size_ = __other.__size_; 448 __other.__size_ = __sz; 449 } 450 451 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type 452 copy(_CharT* __s, size_type __n, size_type __pos = 0) const { 453 if (__pos > size()) 454 std::__throw_out_of_range("string_view::copy"); 455 size_type __rlen = std::min(__n, size() - __pos); 456 _Traits::copy(__s, data() + __pos, __rlen); 457 return __rlen; 458 } 459 460 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI basic_string_view substr(size_type __pos = 0, size_type __n = npos) const { 461 // Use the `__assume_valid` form of the constructor to avoid an unnecessary check. Any substring of a view is a 462 // valid view. In particular, `size()` is known to be smaller than `numeric_limits<difference_type>::max()`, so the 463 // new size is also smaller. See also https://github.com/llvm/llvm-project/issues/91634. 464 return __pos > size() ? (__throw_out_of_range("string_view::substr"), basic_string_view()) 465 : basic_string_view(__assume_valid(), data() + __pos, std::min(__n, size() - __pos)); 466 } 467 468 _LIBCPP_CONSTEXPR_SINCE_CXX14 int compare(basic_string_view __sv) const _NOEXCEPT { 469 size_type __rlen = std::min(size(), __sv.size()); 470 int __retval = _Traits::compare(data(), __sv.data(), __rlen); 471 if (__retval == 0) // first __rlen chars matched 472 __retval = size() == __sv.size() ? 0 : (size() < __sv.size() ? -1 : 1); 473 return __retval; 474 } 475 476 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 477 compare(size_type __pos1, size_type __n1, basic_string_view __sv) const { 478 return substr(__pos1, __n1).compare(__sv); 479 } 480 481 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 482 compare(size_type __pos1, size_type __n1, basic_string_view __sv, size_type __pos2, size_type __n2) const { 483 return substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2)); 484 } 485 486 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int compare(const _CharT* __s) const _NOEXCEPT { 487 return compare(basic_string_view(__s)); 488 } 489 490 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 491 compare(size_type __pos1, size_type __n1, const _CharT* __s) const { 492 return substr(__pos1, __n1).compare(basic_string_view(__s)); 493 } 494 495 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI int 496 compare(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2) const { 497 return substr(__pos1, __n1).compare(basic_string_view(__s, __n2)); 498 } 499 500 // find 501 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 502 find(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 503 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 504 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __s.data(), __pos, __s.size()); 505 } 506 507 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type find(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 508 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 509 } 510 511 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 512 find(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 513 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find(): received nullptr"); 514 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 515 } 516 517 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 518 find(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 519 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find(): received nullptr"); 520 return std::__str_find<value_type, size_type, traits_type, npos>( 521 data(), size(), __s, __pos, traits_type::length(__s)); 522 } 523 524 // rfind 525 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 526 rfind(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 527 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 528 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __s.data(), __pos, __s.size()); 529 } 530 531 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 532 rfind(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 533 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 534 } 535 536 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 537 rfind(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 538 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::rfind(): received nullptr"); 539 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 540 } 541 542 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 543 rfind(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 544 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::rfind(): received nullptr"); 545 return std::__str_rfind<value_type, size_type, traits_type, npos>( 546 data(), size(), __s, __pos, traits_type::length(__s)); 547 } 548 549 // find_first_of 550 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 551 find_first_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 552 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_of(): received nullptr"); 553 return std::__str_find_first_of<value_type, size_type, traits_type, npos>( 554 data(), size(), __s.data(), __pos, __s.size()); 555 } 556 557 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 558 find_first_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 559 return find(__c, __pos); 560 } 561 562 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 563 find_first_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 564 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_first_of(): received nullptr"); 565 return std::__str_find_first_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 566 } 567 568 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 569 find_first_of(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 570 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_first_of(): received nullptr"); 571 return std::__str_find_first_of<value_type, size_type, traits_type, npos>( 572 data(), size(), __s, __pos, traits_type::length(__s)); 573 } 574 575 // find_last_of 576 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 577 find_last_of(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 578 _LIBCPP_ASSERT_NON_NULL(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_of(): received nullptr"); 579 return std::__str_find_last_of<value_type, size_type, traits_type, npos>( 580 data(), size(), __s.data(), __pos, __s.size()); 581 } 582 583 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 584 find_last_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 585 return rfind(__c, __pos); 586 } 587 588 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 589 find_last_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 590 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_last_of(): received nullptr"); 591 return std::__str_find_last_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 592 } 593 594 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 595 find_last_of(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 596 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_last_of(): received nullptr"); 597 return std::__str_find_last_of<value_type, size_type, traits_type, npos>( 598 data(), size(), __s, __pos, traits_type::length(__s)); 599 } 600 601 // find_first_not_of 602 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 603 find_first_not_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT { 604 _LIBCPP_ASSERT_NON_NULL( 605 __s.size() == 0 || __s.data() != nullptr, "string_view::find_first_not_of(): received nullptr"); 606 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>( 607 data(), size(), __s.data(), __pos, __s.size()); 608 } 609 610 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 611 find_first_not_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT { 612 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 613 } 614 615 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 616 find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 617 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_first_not_of(): received nullptr"); 618 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 619 } 620 621 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 622 find_first_not_of(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT { 623 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_first_not_of(): received nullptr"); 624 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>( 625 data(), size(), __s, __pos, traits_type::length(__s)); 626 } 627 628 // find_last_not_of 629 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 630 find_last_not_of(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT { 631 _LIBCPP_ASSERT_NON_NULL( 632 __s.size() == 0 || __s.data() != nullptr, "string_view::find_last_not_of(): received nullptr"); 633 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>( 634 data(), size(), __s.data(), __pos, __s.size()); 635 } 636 637 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 638 find_last_not_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT { 639 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); 640 } 641 642 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 643 find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT { 644 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string_view::find_last_not_of(): received nullptr"); 645 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); 646 } 647 648 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI size_type 649 find_last_not_of(const _CharT* __s, size_type __pos = npos) const _NOEXCEPT { 650 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string_view::find_last_not_of(): received nullptr"); 651 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>( 652 data(), size(), __s, __pos, traits_type::length(__s)); 653 } 654 655# if _LIBCPP_STD_VER >= 20 656 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(basic_string_view __s) const noexcept { 657 return size() >= __s.size() && compare(0, __s.size(), __s) == 0; 658 } 659 660 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(value_type __c) const noexcept { 661 return !empty() && _Traits::eq(front(), __c); 662 } 663 664 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(const value_type* __s) const noexcept { 665 return starts_with(basic_string_view(__s)); 666 } 667 668 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(basic_string_view __s) const noexcept { 669 return size() >= __s.size() && compare(size() - __s.size(), npos, __s) == 0; 670 } 671 672 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(value_type __c) const noexcept { 673 return !empty() && _Traits::eq(back(), __c); 674 } 675 676 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(const value_type* __s) const noexcept { 677 return ends_with(basic_string_view(__s)); 678 } 679# endif 680 681# if _LIBCPP_STD_VER >= 23 682 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(basic_string_view __sv) const noexcept { return find(__sv) != npos; } 683 684 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(value_type __c) const noexcept { return find(__c) != npos; } 685 686 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(const value_type* __s) const { return find(__s) != npos; } 687# endif 688 689private: 690 struct __assume_valid {}; 691 692 // This is the same as the pointer and length constructor, but without the additional hardening checks. It is intended 693 // for use within the class, when the class invariants already guarantee the resulting object is valid. The compiler 694 // usually cannot eliminate the redundant checks because it does not know class invariants. 695 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI 696 basic_string_view(__assume_valid, const _CharT* __s, size_type __len) _NOEXCEPT 697 : __data_(__s), 698 __size_(__len) {} 699 700 const value_type* __data_; 701 size_type __size_; 702 703 template <class, class, class> 704 friend class basic_string; 705}; 706_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(basic_string_view); 707 708# if _LIBCPP_STD_VER >= 20 709template <class _CharT, class _Traits> 710inline constexpr bool ranges::enable_view<basic_string_view<_CharT, _Traits>> = true; 711 712template <class _CharT, class _Traits> 713inline constexpr bool ranges::enable_borrowed_range<basic_string_view<_CharT, _Traits> > = true; 714# endif // _LIBCPP_STD_VER >= 20 715 716// [string.view.deduct] 717 718# if _LIBCPP_STD_VER >= 20 719template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 720basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>; 721# endif // _LIBCPP_STD_VER >= 20 722 723# if _LIBCPP_STD_VER >= 23 724template <ranges::contiguous_range _Range> 725basic_string_view(_Range) -> basic_string_view<ranges::range_value_t<_Range>>; 726# endif 727 728// [string.view.comparison] 729 730// The dummy default template parameters are used to work around a MSVC issue with mangling, see VSO-409326 for details. 731// This applies to the other sufficient overloads below for the other comparison operators. 732template <class _CharT, class _Traits, int = 1> 733_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 734operator==(basic_string_view<_CharT, _Traits> __lhs, 735 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 736 if (__lhs.size() != __rhs.size()) 737 return false; 738 return __lhs.compare(__rhs) == 0; 739} 740 741# if _LIBCPP_STD_VER >= 20 742 743template <class _CharT, class _Traits> 744_LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(basic_string_view<_CharT, _Traits> __lhs, 745 type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) noexcept { 746 if constexpr (requires { typename _Traits::comparison_category; }) { 747 // [string.view]/4 748 static_assert( 749 __comparison_category<typename _Traits::comparison_category>, "return type is not a comparison category type"); 750 return static_cast<typename _Traits::comparison_category>(__lhs.compare(__rhs) <=> 0); 751 } else { 752 return static_cast<weak_ordering>(__lhs.compare(__rhs) <=> 0); 753 } 754} 755 756# else 757 758// operator == 759 760template <class _CharT, class _Traits> 761_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 762operator==(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 763 if (__lhs.size() != __rhs.size()) 764 return false; 765 return __lhs.compare(__rhs) == 0; 766} 767 768template <class _CharT, class _Traits, int = 2> 769_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 770operator==(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 771 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 772 return __lhs == __rhs; 773} 774 775// operator != 776template <class _CharT, class _Traits> 777_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 778operator!=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 779 return !(__lhs == __rhs); 780} 781 782template <class _CharT, class _Traits, int = 1> 783_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 784operator!=(basic_string_view<_CharT, _Traits> __lhs, 785 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 786 return !(__lhs == __rhs); 787} 788 789template <class _CharT, class _Traits, int = 2> 790_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 791operator!=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 792 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 793 return !(__lhs == __rhs); 794} 795 796// operator < 797template <class _CharT, class _Traits> 798_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 799operator<(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 800 return __lhs.compare(__rhs) < 0; 801} 802 803template <class _CharT, class _Traits, int = 1> 804_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 805operator<(basic_string_view<_CharT, _Traits> __lhs, 806 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 807 return __lhs.compare(__rhs) < 0; 808} 809 810template <class _CharT, class _Traits, int = 2> 811_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 812operator<(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 813 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 814 return __lhs.compare(__rhs) < 0; 815} 816 817// operator > 818template <class _CharT, class _Traits> 819_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 820operator>(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 821 return __lhs.compare(__rhs) > 0; 822} 823 824template <class _CharT, class _Traits, int = 1> 825_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 826operator>(basic_string_view<_CharT, _Traits> __lhs, 827 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 828 return __lhs.compare(__rhs) > 0; 829} 830 831template <class _CharT, class _Traits, int = 2> 832_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 833operator>(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 834 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 835 return __lhs.compare(__rhs) > 0; 836} 837 838// operator <= 839template <class _CharT, class _Traits> 840_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 841operator<=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 842 return __lhs.compare(__rhs) <= 0; 843} 844 845template <class _CharT, class _Traits, int = 1> 846_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 847operator<=(basic_string_view<_CharT, _Traits> __lhs, 848 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 849 return __lhs.compare(__rhs) <= 0; 850} 851 852template <class _CharT, class _Traits, int = 2> 853_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 854operator<=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 855 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 856 return __lhs.compare(__rhs) <= 0; 857} 858 859// operator >= 860template <class _CharT, class _Traits> 861_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 862operator>=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 863 return __lhs.compare(__rhs) >= 0; 864} 865 866template <class _CharT, class _Traits, int = 1> 867_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 868operator>=(basic_string_view<_CharT, _Traits> __lhs, 869 __type_identity_t<basic_string_view<_CharT, _Traits> > __rhs) _NOEXCEPT { 870 return __lhs.compare(__rhs) >= 0; 871} 872 873template <class _CharT, class _Traits, int = 2> 874_LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 875operator>=(__type_identity_t<basic_string_view<_CharT, _Traits> > __lhs, 876 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT { 877 return __lhs.compare(__rhs) >= 0; 878} 879 880# endif // _LIBCPP_STD_VER >= 20 881 882template <class _CharT, class _Traits> 883_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& 884operator<<(basic_ostream<_CharT, _Traits>& __os, basic_string_view<_CharT, _Traits> __str); 885 886// [string.view.hash] 887template <class _CharT> 888struct __string_view_hash : public __unary_function<basic_string_view<_CharT, char_traits<_CharT> >, size_t> { 889 _LIBCPP_HIDE_FROM_ABI size_t operator()(const basic_string_view<_CharT, char_traits<_CharT> > __val) const _NOEXCEPT { 890 return std::__do_string_hash(__val.data(), __val.data() + __val.size()); 891 } 892}; 893 894template <> 895struct hash<basic_string_view<char, char_traits<char> > > : __string_view_hash<char> {}; 896 897# if _LIBCPP_HAS_CHAR8_T 898template <> 899struct hash<basic_string_view<char8_t, char_traits<char8_t> > > : __string_view_hash<char8_t> {}; 900# endif 901 902template <> 903struct hash<basic_string_view<char16_t, char_traits<char16_t> > > : __string_view_hash<char16_t> {}; 904 905template <> 906struct hash<basic_string_view<char32_t, char_traits<char32_t> > > : __string_view_hash<char32_t> {}; 907 908# if _LIBCPP_HAS_WIDE_CHARACTERS 909template <> 910struct hash<basic_string_view<wchar_t, char_traits<wchar_t> > > : __string_view_hash<wchar_t> {}; 911# endif 912 913# if _LIBCPP_STD_VER >= 14 914inline namespace literals { 915inline namespace string_view_literals { 916inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char> operator""sv(const char* __str, size_t __len) noexcept { 917 return basic_string_view<char>(__str, __len); 918} 919 920# if _LIBCPP_HAS_WIDE_CHARACTERS 921inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<wchar_t> 922operator""sv(const wchar_t* __str, size_t __len) noexcept { 923 return basic_string_view<wchar_t>(__str, __len); 924} 925# endif 926 927# if _LIBCPP_HAS_CHAR8_T 928inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char8_t> 929operator""sv(const char8_t* __str, size_t __len) noexcept { 930 return basic_string_view<char8_t>(__str, __len); 931} 932# endif 933 934inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char16_t> 935operator""sv(const char16_t* __str, size_t __len) noexcept { 936 return basic_string_view<char16_t>(__str, __len); 937} 938 939inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<char32_t> 940operator""sv(const char32_t* __str, size_t __len) noexcept { 941 return basic_string_view<char32_t>(__str, __len); 942} 943} // namespace string_view_literals 944} // namespace literals 945# endif 946_LIBCPP_END_NAMESPACE_STD 947 948_LIBCPP_POP_MACROS 949 950# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 951# include <algorithm> 952# include <concepts> 953# include <cstdlib> 954# include <iterator> 955# include <optional> 956# include <type_traits> 957# endif 958#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) 959 960#endif // _LIBCPP_STRING_VIEW 961