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/* 14 15 string_view synopsis 16 17namespace std { 18 19 // 7.2, Class template basic_string_view 20 template<class charT, class traits = char_traits<charT>> 21 class basic_string_view; 22 23 template<class charT, class traits> 24 inline constexpr bool ranges::enable_view<basic_string_view<charT, traits>> = true; 25 26 template<class charT, class traits> 27 inline constexpr bool ranges::enable_borrowed_range<basic_string_view<charT, traits>> = true; // C++20 28 29 // 7.9, basic_string_view non-member comparison functions 30 template<class charT, class traits> 31 constexpr bool operator==(basic_string_view<charT, traits> x, 32 basic_string_view<charT, traits> y) noexcept; 33 template<class charT, class traits> 34 constexpr bool operator!=(basic_string_view<charT, traits> x, 35 basic_string_view<charT, traits> y) noexcept; 36 template<class charT, class traits> 37 constexpr bool operator< (basic_string_view<charT, traits> x, 38 basic_string_view<charT, traits> y) noexcept; 39 template<class charT, class traits> 40 constexpr bool operator> (basic_string_view<charT, traits> x, 41 basic_string_view<charT, traits> y) noexcept; 42 template<class charT, class traits> 43 constexpr bool operator<=(basic_string_view<charT, traits> x, 44 basic_string_view<charT, traits> y) noexcept; 45 template<class charT, class traits> 46 constexpr bool operator>=(basic_string_view<charT, traits> x, 47 basic_string_view<charT, traits> y) noexcept; 48 // see below, sufficient additional overloads of comparison functions 49 50 // 7.10, Inserters and extractors 51 template<class charT, class traits> 52 basic_ostream<charT, traits>& 53 operator<<(basic_ostream<charT, traits>& os, 54 basic_string_view<charT, traits> str); 55 56 // basic_string_view typedef names 57 typedef basic_string_view<char> string_view; 58 typedef basic_string_view<char8_t> u8string_view; // C++20 59 typedef basic_string_view<char16_t> u16string_view; 60 typedef basic_string_view<char32_t> u32string_view; 61 typedef basic_string_view<wchar_t> wstring_view; 62 63 template<class charT, class traits = char_traits<charT>> 64 class basic_string_view { 65 public: 66 // types 67 typedef traits traits_type; 68 typedef charT value_type; 69 typedef charT* pointer; 70 typedef const charT* const_pointer; 71 typedef charT& reference; 72 typedef const charT& const_reference; 73 typedef implementation-defined const_iterator; 74 typedef const_iterator iterator; 75 typedef reverse_iterator<const_iterator> const_reverse_iterator; 76 typedef const_reverse_iterator reverse_iterator; 77 typedef size_t size_type; 78 typedef ptrdiff_t difference_type; 79 static constexpr size_type npos = size_type(-1); 80 81 // 7.3, basic_string_view constructors and assignment operators 82 constexpr basic_string_view() noexcept; 83 constexpr basic_string_view(const basic_string_view&) noexcept = default; 84 basic_string_view& operator=(const basic_string_view&) noexcept = default; 85 template<class Allocator> 86 constexpr basic_string_view(const charT* str); 87 basic_string_view(nullptr_t) = delete; // C++2b 88 constexpr basic_string_view(const charT* str, size_type len); 89 template <class It, class End> 90 constexpr basic_string_view(It begin, End end); // C++20 91 template <class Range> 92 constexpr basic_string_view(Range&& r); // C++23 93 94 // 7.4, basic_string_view iterator support 95 constexpr const_iterator begin() const noexcept; 96 constexpr const_iterator end() const noexcept; 97 constexpr const_iterator cbegin() const noexcept; 98 constexpr const_iterator cend() const noexcept; 99 const_reverse_iterator rbegin() const noexcept; 100 const_reverse_iterator rend() const noexcept; 101 const_reverse_iterator crbegin() const noexcept; 102 const_reverse_iterator crend() const noexcept; 103 104 // 7.5, basic_string_view capacity 105 constexpr size_type size() const noexcept; 106 constexpr size_type length() const noexcept; 107 constexpr size_type max_size() const noexcept; 108 constexpr bool empty() const noexcept; 109 110 // 7.6, basic_string_view element access 111 constexpr const_reference operator[](size_type pos) const; 112 constexpr const_reference at(size_type pos) const; 113 constexpr const_reference front() const; 114 constexpr const_reference back() const; 115 constexpr const_pointer data() const noexcept; 116 117 // 7.7, basic_string_view modifiers 118 constexpr void remove_prefix(size_type n); 119 constexpr void remove_suffix(size_type n); 120 constexpr void swap(basic_string_view& s) noexcept; 121 122 size_type copy(charT* s, size_type n, size_type pos = 0) const; // constexpr in C++20 123 124 constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const; 125 constexpr int compare(basic_string_view s) const noexcept; 126 constexpr int compare(size_type pos1, size_type n1, basic_string_view s) const; 127 constexpr int compare(size_type pos1, size_type n1, 128 basic_string_view s, size_type pos2, size_type n2) const; 129 constexpr int compare(const charT* s) const; 130 constexpr int compare(size_type pos1, size_type n1, const charT* s) const; 131 constexpr int compare(size_type pos1, size_type n1, 132 const charT* s, size_type n2) const; 133 constexpr size_type find(basic_string_view s, size_type pos = 0) const noexcept; 134 constexpr size_type find(charT c, size_type pos = 0) const noexcept; 135 constexpr size_type find(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 136 constexpr size_type find(const charT* s, size_type pos = 0) const noexcept; // noexcept as an extension 137 constexpr size_type rfind(basic_string_view s, size_type pos = npos) const noexcept; 138 constexpr size_type rfind(charT c, size_type pos = npos) const noexcept; 139 constexpr size_type rfind(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 140 constexpr size_type rfind(const charT* s, size_type pos = npos) const noexcept; // noexcept as an extension 141 constexpr size_type find_first_of(basic_string_view s, size_type pos = 0) const noexcept; 142 constexpr size_type find_first_of(charT c, size_type pos = 0) const noexcept; 143 constexpr size_type find_first_of(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 144 constexpr size_type find_first_of(const charT* s, size_type pos = 0) const noexcept; // noexcept as an extension 145 constexpr size_type find_last_of(basic_string_view s, size_type pos = npos) const noexcept; 146 constexpr size_type find_last_of(charT c, size_type pos = npos) const noexcept; 147 constexpr size_type find_last_of(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 148 constexpr size_type find_last_of(const charT* s, size_type pos = npos) const noexcept; // noexcept as an extension 149 constexpr size_type find_first_not_of(basic_string_view s, size_type pos = 0) const noexcept; 150 constexpr size_type find_first_not_of(charT c, size_type pos = 0) const noexcept; 151 constexpr size_type find_first_not_of(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 152 constexpr size_type find_first_not_of(const charT* s, size_type pos = 0) const noexcept; // noexcept as an extension 153 constexpr size_type find_last_not_of(basic_string_view s, size_type pos = npos) const noexcept; 154 constexpr size_type find_last_not_of(charT c, size_type pos = npos) const noexcept; 155 constexpr size_type find_last_not_of(const charT* s, size_type pos, size_type n) const noexcept; // noexcept as an extension 156 constexpr size_type find_last_not_of(const charT* s, size_type pos = npos) const noexcept; // noexcept as an extension 157 158 constexpr bool starts_with(basic_string_view s) const noexcept; // C++20 159 constexpr bool starts_with(charT c) const noexcept; // C++20 160 constexpr bool starts_with(const charT* s) const; // C++20 161 constexpr bool ends_with(basic_string_view s) const noexcept; // C++20 162 constexpr bool ends_with(charT c) const noexcept; // C++20 163 constexpr bool ends_with(const charT* s) const; // C++20 164 165 constexpr bool contains(basic_string_view s) const noexcept; // C++2b 166 constexpr bool contains(charT c) const noexcept; // C++2b 167 constexpr bool contains(const charT* s) const; // C++2b 168 169 private: 170 const_pointer data_; // exposition only 171 size_type size_; // exposition only 172 }; 173 174 // basic_string_view deduction guides 175 template<class It, class End> 176 basic_string_view(It, End) -> basic_string_view<iter_value_t<It>>; // C++20 177 template<class Range> 178 basic_string_view(Range&&) -> basic_string_view<ranges::range_value_t<Range>>; // C++23 179 180 // 7.11, Hash support 181 template <class T> struct hash; 182 template <> struct hash<string_view>; 183 template <> struct hash<u8string_view>; // C++20 184 template <> struct hash<u16string_view>; 185 template <> struct hash<u32string_view>; 186 template <> struct hash<wstring_view>; 187 188 constexpr basic_string_view<char> operator "" sv( const char *str, size_t len ) noexcept; 189 constexpr basic_string_view<wchar_t> operator "" sv( const wchar_t *str, size_t len ) noexcept; 190 constexpr basic_string_view<char8_t> operator "" sv( const char8_t *str, size_t len ) noexcept; // C++20 191 constexpr basic_string_view<char16_t> operator "" sv( const char16_t *str, size_t len ) noexcept; 192 constexpr basic_string_view<char32_t> operator "" sv( const char32_t *str, size_t len ) noexcept; 193 194} // namespace std 195 196 197*/ 198 199#include <__algorithm/min.h> 200#include <__assert> // all public C++ headers provide the assertion handler 201#include <__config> 202#include <__functional/hash.h> 203#include <__functional/unary_function.h> 204#include <__fwd/string_view.h> 205#include <__iterator/concepts.h> 206#include <__iterator/readable_traits.h> 207#include <__iterator/reverse_iterator.h> 208#include <__memory/pointer_traits.h> 209#include <__ranges/concepts.h> 210#include <__ranges/data.h> 211#include <__ranges/enable_borrowed_range.h> 212#include <__ranges/enable_view.h> 213#include <__ranges/size.h> 214#include <__string/char_traits.h> 215#include <iosfwd> 216#include <limits> 217#include <stdexcept> 218#include <type_traits> 219#include <version> 220 221#ifndef _LIBCPP_REMOVE_TRANSITIVE_INCLUDES 222# include <algorithm> 223# include <functional> 224# include <iterator> 225#endif 226 227// standard-mandated includes 228 229// [iterator.range] 230#include <__iterator/access.h> 231#include <__iterator/data.h> 232#include <__iterator/empty.h> 233#include <__iterator/reverse_access.h> 234#include <__iterator/size.h> 235 236// [string.view.synop] 237#include <compare> 238 239#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 240# pragma GCC system_header 241#endif 242 243_LIBCPP_PUSH_MACROS 244#include <__undef_macros> 245 246 247_LIBCPP_BEGIN_NAMESPACE_STD 248 249// TODO: This is a workaround for some vendors to carry a downstream diff to accept `nullptr` in 250// string_view constructors. This can be refactored when this exact form isn't needed anymore. 251template <class _Traits> 252_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR 253inline size_t __char_traits_length_checked(const typename _Traits::char_type* __s) _NOEXCEPT { 254 // This needs to be a single statement for C++11 constexpr 255 return _LIBCPP_ASSERT(__s != nullptr, "null pointer passed to non-null argument of char_traits<...>::length"), _Traits::length(__s); 256} 257 258template<class _CharT, class _Traits> 259class 260 _LIBCPP_PREFERRED_NAME(string_view) 261#ifndef _LIBCPP_HAS_NO_CHAR8_T 262 _LIBCPP_PREFERRED_NAME(u8string_view) 263#endif 264 _LIBCPP_PREFERRED_NAME(u16string_view) 265 _LIBCPP_PREFERRED_NAME(u32string_view) 266 _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wstring_view)) 267 basic_string_view { 268public: 269 // types 270 typedef _Traits traits_type; 271 typedef _CharT value_type; 272 typedef _CharT* pointer; 273 typedef const _CharT* const_pointer; 274 typedef _CharT& reference; 275 typedef const _CharT& const_reference; 276 typedef const_pointer const_iterator; // See [string.view.iterators] 277 typedef const_iterator iterator; 278 typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator; 279 typedef const_reverse_iterator reverse_iterator; 280 typedef size_t size_type; 281 typedef ptrdiff_t difference_type; 282 static _LIBCPP_CONSTEXPR const size_type npos = -1; // size_type(-1); 283 284 static_assert((!is_array<value_type>::value), "Character type of basic_string_view must not be an array"); 285 static_assert(( is_standard_layout<value_type>::value), "Character type of basic_string_view must be standard-layout"); 286 static_assert(( is_trivial<value_type>::value), "Character type of basic_string_view must be trivial"); 287 static_assert((is_same<_CharT, typename traits_type::char_type>::value), 288 "traits_type::char_type must be the same type as CharT"); 289 290 // [string.view.cons], construct/copy 291 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 292 basic_string_view() _NOEXCEPT : __data (nullptr), __size(0) {} 293 294 _LIBCPP_INLINE_VISIBILITY 295 basic_string_view(const basic_string_view&) _NOEXCEPT = default; 296 297 _LIBCPP_INLINE_VISIBILITY 298 basic_string_view& operator=(const basic_string_view&) _NOEXCEPT = default; 299 300 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 301 basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT 302 : __data(__s), __size(__len) 303 { 304#if _LIBCPP_STD_VER > 11 305 _LIBCPP_ASSERT(__len == 0 || __s != nullptr, "string_view::string_view(_CharT *, size_t): received nullptr"); 306#endif 307 } 308 309#if _LIBCPP_STD_VER > 17 310 template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 311 requires (is_same_v<iter_value_t<_It>, _CharT> && !is_convertible_v<_End, size_type>) 312 constexpr _LIBCPP_HIDE_FROM_ABI basic_string_view(_It __begin, _End __end) 313 : __data(_VSTD::to_address(__begin)), __size(__end - __begin) 314 { 315 _LIBCPP_ASSERT((__end - __begin) >= 0, "std::string_view::string_view(iterator, sentinel) received invalid range"); 316 } 317#endif // _LIBCPP_STD_VER > 17 318 319#if _LIBCPP_STD_VER > 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 320 template <class _Range> 321 requires ( 322 !is_same_v<remove_cvref_t<_Range>, basic_string_view> && 323 ranges::contiguous_range<_Range> && 324 ranges::sized_range<_Range> && 325 is_same_v<ranges::range_value_t<_Range>, _CharT> && 326 !is_convertible_v<_Range, const _CharT*> && 327 (!requires(remove_cvref_t<_Range>& d) { 328 d.operator _VSTD::basic_string_view<_CharT, _Traits>(); 329 }) && 330 (!requires { 331 typename remove_reference_t<_Range>::traits_type; 332 } || is_same_v<typename remove_reference_t<_Range>::traits_type, _Traits>) 333 ) 334 constexpr _LIBCPP_HIDE_FROM_ABI 335 basic_string_view(_Range&& __r) : __data(ranges::data(__r)), __size(ranges::size(__r)) {} 336#endif // _LIBCPP_STD_VER > 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 337 338 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 339 basic_string_view(const _CharT* __s) 340 : __data(__s), __size(_VSTD::__char_traits_length_checked<_Traits>(__s)) {} 341 342#if _LIBCPP_STD_VER > 20 343 basic_string_view(nullptr_t) = delete; 344#endif 345 346 // [string.view.iterators], iterators 347 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 348 const_iterator begin() const _NOEXCEPT { return cbegin(); } 349 350 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 351 const_iterator end() const _NOEXCEPT { return cend(); } 352 353 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 354 const_iterator cbegin() const _NOEXCEPT { return __data; } 355 356 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 357 const_iterator cend() const _NOEXCEPT { return __data + __size; } 358 359 _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY 360 const_reverse_iterator rbegin() const _NOEXCEPT { return const_reverse_iterator(cend()); } 361 362 _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY 363 const_reverse_iterator rend() const _NOEXCEPT { return const_reverse_iterator(cbegin()); } 364 365 _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY 366 const_reverse_iterator crbegin() const _NOEXCEPT { return const_reverse_iterator(cend()); } 367 368 _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY 369 const_reverse_iterator crend() const _NOEXCEPT { return const_reverse_iterator(cbegin()); } 370 371 // [string.view.capacity], capacity 372 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 373 size_type size() const _NOEXCEPT { return __size; } 374 375 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 376 size_type length() const _NOEXCEPT { return __size; } 377 378 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 379 size_type max_size() const _NOEXCEPT { return numeric_limits<size_type>::max() / sizeof(value_type); } 380 381 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 382 bool empty() const _NOEXCEPT { return __size == 0; } 383 384 // [string.view.access], element access 385 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 386 const_reference operator[](size_type __pos) const _NOEXCEPT { 387 return _LIBCPP_ASSERT(__pos < size(), "string_view[] index out of bounds"), __data[__pos]; 388 } 389 390 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 391 const_reference at(size_type __pos) const 392 { 393 return __pos >= size() 394 ? (__throw_out_of_range("string_view::at"), __data[0]) 395 : __data[__pos]; 396 } 397 398 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 399 const_reference front() const _NOEXCEPT 400 { 401 return _LIBCPP_ASSERT(!empty(), "string_view::front(): string is empty"), __data[0]; 402 } 403 404 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 405 const_reference back() const _NOEXCEPT 406 { 407 return _LIBCPP_ASSERT(!empty(), "string_view::back(): string is empty"), __data[__size-1]; 408 } 409 410 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 411 const_pointer data() const _NOEXCEPT { return __data; } 412 413 // [string.view.modifiers], modifiers: 414 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 415 void remove_prefix(size_type __n) _NOEXCEPT 416 { 417 _LIBCPP_ASSERT(__n <= size(), "remove_prefix() can't remove more than size()"); 418 __data += __n; 419 __size -= __n; 420 } 421 422 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 423 void remove_suffix(size_type __n) _NOEXCEPT 424 { 425 _LIBCPP_ASSERT(__n <= size(), "remove_suffix() can't remove more than size()"); 426 __size -= __n; 427 } 428 429 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 430 void swap(basic_string_view& __other) _NOEXCEPT 431 { 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_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 442 size_type copy(_CharT* __s, size_type __n, size_type __pos = 0) const 443 { 444 if (__pos > size()) 445 __throw_out_of_range("string_view::copy"); 446 size_type __rlen = _VSTD::min(__n, size() - __pos); 447 _Traits::copy(__s, data() + __pos, __rlen); 448 return __rlen; 449 } 450 451 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 452 basic_string_view substr(size_type __pos = 0, size_type __n = npos) const 453 { 454 return __pos > size() 455 ? (__throw_out_of_range("string_view::substr"), basic_string_view()) 456 : basic_string_view(data() + __pos, _VSTD::min(__n, size() - __pos)); 457 } 458 459 _LIBCPP_CONSTEXPR_AFTER_CXX11 int compare(basic_string_view __sv) const _NOEXCEPT 460 { 461 size_type __rlen = _VSTD::min( size(), __sv.size()); 462 int __retval = _Traits::compare(data(), __sv.data(), __rlen); 463 if ( __retval == 0 ) // first __rlen chars matched 464 __retval = size() == __sv.size() ? 0 : ( size() < __sv.size() ? -1 : 1 ); 465 return __retval; 466 } 467 468 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 469 int compare(size_type __pos1, size_type __n1, basic_string_view __sv) const 470 { 471 return substr(__pos1, __n1).compare(__sv); 472 } 473 474 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 475 int compare( size_type __pos1, size_type __n1, 476 basic_string_view __sv, size_type __pos2, size_type __n2) const 477 { 478 return substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2)); 479 } 480 481 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 482 int compare(const _CharT* __s) const _NOEXCEPT 483 { 484 return compare(basic_string_view(__s)); 485 } 486 487 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 488 int compare(size_type __pos1, size_type __n1, const _CharT* __s) const 489 { 490 return substr(__pos1, __n1).compare(basic_string_view(__s)); 491 } 492 493 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 494 int compare(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2) const 495 { 496 return substr(__pos1, __n1).compare(basic_string_view(__s, __n2)); 497 } 498 499 // find 500 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 501 size_type find(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT 502 { 503 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 504 return __str_find<value_type, size_type, traits_type, npos> 505 (data(), size(), __s.data(), __pos, __s.size()); 506 } 507 508 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 509 size_type find(_CharT __c, size_type __pos = 0) const _NOEXCEPT 510 { 511 return __str_find<value_type, size_type, traits_type, npos> 512 (data(), size(), __c, __pos); 513 } 514 515 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 516 size_type find(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 517 { 518 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find(): received nullptr"); 519 return __str_find<value_type, size_type, traits_type, npos> 520 (data(), size(), __s, __pos, __n); 521 } 522 523 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 524 size_type find(const _CharT* __s, size_type __pos = 0) const _NOEXCEPT 525 { 526 _LIBCPP_ASSERT(__s != nullptr, "string_view::find(): received nullptr"); 527 return __str_find<value_type, size_type, traits_type, npos> 528 (data(), size(), __s, __pos, traits_type::length(__s)); 529 } 530 531 // rfind 532 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 533 size_type rfind(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT 534 { 535 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr"); 536 return __str_rfind<value_type, size_type, traits_type, npos> 537 (data(), size(), __s.data(), __pos, __s.size()); 538 } 539 540 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 541 size_type rfind(_CharT __c, size_type __pos = npos) const _NOEXCEPT 542 { 543 return __str_rfind<value_type, size_type, traits_type, npos> 544 (data(), size(), __c, __pos); 545 } 546 547 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 548 size_type rfind(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 549 { 550 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::rfind(): received nullptr"); 551 return __str_rfind<value_type, size_type, traits_type, npos> 552 (data(), size(), __s, __pos, __n); 553 } 554 555 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 556 size_type rfind(const _CharT* __s, size_type __pos=npos) const _NOEXCEPT 557 { 558 _LIBCPP_ASSERT(__s != nullptr, "string_view::rfind(): received nullptr"); 559 return __str_rfind<value_type, size_type, traits_type, npos> 560 (data(), size(), __s, __pos, traits_type::length(__s)); 561 } 562 563 // find_first_of 564 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 565 size_type find_first_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT 566 { 567 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_of(): received nullptr"); 568 return __str_find_first_of<value_type, size_type, traits_type, npos> 569 (data(), size(), __s.data(), __pos, __s.size()); 570 } 571 572 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 573 size_type find_first_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT 574 { return find(__c, __pos); } 575 576 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 577 size_type find_first_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 578 { 579 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_of(): received nullptr"); 580 return __str_find_first_of<value_type, size_type, traits_type, npos> 581 (data(), size(), __s, __pos, __n); 582 } 583 584 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 585 size_type find_first_of(const _CharT* __s, size_type __pos=0) const _NOEXCEPT 586 { 587 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_of(): received nullptr"); 588 return __str_find_first_of<value_type, size_type, traits_type, npos> 589 (data(), size(), __s, __pos, traits_type::length(__s)); 590 } 591 592 // find_last_of 593 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 594 size_type find_last_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT 595 { 596 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_of(): received nullptr"); 597 return __str_find_last_of<value_type, size_type, traits_type, npos> 598 (data(), size(), __s.data(), __pos, __s.size()); 599 } 600 601 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 602 size_type find_last_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT 603 { return rfind(__c, __pos); } 604 605 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 606 size_type find_last_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 607 { 608 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_of(): received nullptr"); 609 return __str_find_last_of<value_type, size_type, traits_type, npos> 610 (data(), size(), __s, __pos, __n); 611 } 612 613 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 614 size_type find_last_of(const _CharT* __s, size_type __pos=npos) const _NOEXCEPT 615 { 616 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_of(): received nullptr"); 617 return __str_find_last_of<value_type, size_type, traits_type, npos> 618 (data(), size(), __s, __pos, traits_type::length(__s)); 619 } 620 621 // find_first_not_of 622 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 623 size_type find_first_not_of(basic_string_view __s, size_type __pos=0) const _NOEXCEPT 624 { 625 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_not_of(): received nullptr"); 626 return __str_find_first_not_of<value_type, size_type, traits_type, npos> 627 (data(), size(), __s.data(), __pos, __s.size()); 628 } 629 630 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 631 size_type find_first_not_of(_CharT __c, size_type __pos=0) const _NOEXCEPT 632 { 633 return __str_find_first_not_of<value_type, size_type, traits_type, npos> 634 (data(), size(), __c, __pos); 635 } 636 637 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 638 size_type find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 639 { 640 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_not_of(): received nullptr"); 641 return __str_find_first_not_of<value_type, size_type, traits_type, npos> 642 (data(), size(), __s, __pos, __n); 643 } 644 645 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 646 size_type find_first_not_of(const _CharT* __s, size_type __pos=0) const _NOEXCEPT 647 { 648 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_not_of(): received nullptr"); 649 return __str_find_first_not_of<value_type, size_type, traits_type, npos> 650 (data(), size(), __s, __pos, traits_type::length(__s)); 651 } 652 653 // find_last_not_of 654 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 655 size_type find_last_not_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT 656 { 657 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_not_of(): received nullptr"); 658 return __str_find_last_not_of<value_type, size_type, traits_type, npos> 659 (data(), size(), __s.data(), __pos, __s.size()); 660 } 661 662 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 663 size_type find_last_not_of(_CharT __c, size_type __pos=npos) const _NOEXCEPT 664 { 665 return __str_find_last_not_of<value_type, size_type, traits_type, npos> 666 (data(), size(), __c, __pos); 667 } 668 669 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 670 size_type find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const _NOEXCEPT 671 { 672 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_not_of(): received nullptr"); 673 return __str_find_last_not_of<value_type, size_type, traits_type, npos> 674 (data(), size(), __s, __pos, __n); 675 } 676 677 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 678 size_type find_last_not_of(const _CharT* __s, size_type __pos=npos) const _NOEXCEPT 679 { 680 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_not_of(): received nullptr"); 681 return __str_find_last_not_of<value_type, size_type, traits_type, npos> 682 (data(), size(), __s, __pos, traits_type::length(__s)); 683 } 684 685#if _LIBCPP_STD_VER > 17 686 constexpr _LIBCPP_INLINE_VISIBILITY 687 bool starts_with(basic_string_view __s) const noexcept 688 { return size() >= __s.size() && compare(0, __s.size(), __s) == 0; } 689 690 constexpr _LIBCPP_INLINE_VISIBILITY 691 bool starts_with(value_type __c) const noexcept 692 { return !empty() && _Traits::eq(front(), __c); } 693 694 constexpr _LIBCPP_INLINE_VISIBILITY 695 bool starts_with(const value_type* __s) const noexcept 696 { return starts_with(basic_string_view(__s)); } 697 698 constexpr _LIBCPP_INLINE_VISIBILITY 699 bool ends_with(basic_string_view __s) const noexcept 700 { return size() >= __s.size() && compare(size() - __s.size(), npos, __s) == 0; } 701 702 constexpr _LIBCPP_INLINE_VISIBILITY 703 bool ends_with(value_type __c) const noexcept 704 { return !empty() && _Traits::eq(back(), __c); } 705 706 constexpr _LIBCPP_INLINE_VISIBILITY 707 bool ends_with(const value_type* __s) const noexcept 708 { return ends_with(basic_string_view(__s)); } 709#endif 710 711#if _LIBCPP_STD_VER > 20 712 constexpr _LIBCPP_INLINE_VISIBILITY 713 bool contains(basic_string_view __sv) const noexcept 714 { return find(__sv) != npos; } 715 716 constexpr _LIBCPP_INLINE_VISIBILITY 717 bool contains(value_type __c) const noexcept 718 { return find(__c) != npos; } 719 720 constexpr _LIBCPP_INLINE_VISIBILITY 721 bool contains(const value_type* __s) const 722 { return find(__s) != npos; } 723#endif 724 725private: 726 const value_type* __data; 727 size_type __size; 728}; 729 730#if _LIBCPP_STD_VER > 17 731template <class _CharT, class _Traits> 732inline constexpr bool ranges::enable_view<basic_string_view<_CharT, _Traits>> = true; 733 734template <class _CharT, class _Traits> 735inline constexpr bool ranges::enable_borrowed_range<basic_string_view<_CharT, _Traits> > = true; 736#endif // _LIBCPP_STD_VER > 17 737 738// [string.view.deduct] 739 740#if _LIBCPP_STD_VER > 17 741template <contiguous_iterator _It, sized_sentinel_for<_It> _End> 742 basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>; 743#endif // _LIBCPP_STD_VER > 17 744 745 746#if _LIBCPP_STD_VER > 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 747template <ranges::contiguous_range _Range> 748 basic_string_view(_Range) -> basic_string_view<ranges::range_value_t<_Range>>; 749#endif // _LIBCPP_STD_VER > 20 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) 750 751// [string.view.comparison] 752// operator == 753template<class _CharT, class _Traits> 754_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 755bool operator==(basic_string_view<_CharT, _Traits> __lhs, 756 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 757{ 758 if ( __lhs.size() != __rhs.size()) return false; 759 return __lhs.compare(__rhs) == 0; 760} 761 762// The dummy default template parameters are used to work around a MSVC issue with mangling, see VSO-409326 for details. 763// This applies to the other sufficient overloads below for the other comparison operators. 764template<class _CharT, class _Traits, int = 1> 765_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 766bool operator==(basic_string_view<_CharT, _Traits> __lhs, 767 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT 768{ 769 if ( __lhs.size() != __rhs.size()) return false; 770 return __lhs.compare(__rhs) == 0; 771} 772 773template<class _CharT, class _Traits, int = 2> 774_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 775bool operator==(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 776 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 777{ 778 if ( __lhs.size() != __rhs.size()) return false; 779 return __lhs.compare(__rhs) == 0; 780} 781 782 783// operator != 784template<class _CharT, class _Traits> 785_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 786bool operator!=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 787{ 788 if ( __lhs.size() != __rhs.size()) 789 return true; 790 return __lhs.compare(__rhs) != 0; 791} 792 793template<class _CharT, class _Traits, int = 1> 794_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 795bool operator!=(basic_string_view<_CharT, _Traits> __lhs, 796 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT 797{ 798 if ( __lhs.size() != __rhs.size()) 799 return true; 800 return __lhs.compare(__rhs) != 0; 801} 802 803template<class _CharT, class _Traits, int = 2> 804_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 805bool operator!=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 806 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 807{ 808 if ( __lhs.size() != __rhs.size()) 809 return true; 810 return __lhs.compare(__rhs) != 0; 811} 812 813 814// operator < 815template<class _CharT, class _Traits> 816_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 817bool operator<(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 818{ 819 return __lhs.compare(__rhs) < 0; 820} 821 822template<class _CharT, class _Traits, int = 1> 823_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 824bool operator<(basic_string_view<_CharT, _Traits> __lhs, 825 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT 826{ 827 return __lhs.compare(__rhs) < 0; 828} 829 830template<class _CharT, class _Traits, int = 2> 831_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 832bool operator<(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 833 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 834{ 835 return __lhs.compare(__rhs) < 0; 836} 837 838 839// operator > 840template<class _CharT, class _Traits> 841_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 842bool operator> (basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 843{ 844 return __lhs.compare(__rhs) > 0; 845} 846 847template<class _CharT, class _Traits, int = 1> 848_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 849bool operator>(basic_string_view<_CharT, _Traits> __lhs, 850 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT 851{ 852 return __lhs.compare(__rhs) > 0; 853} 854 855template<class _CharT, class _Traits, int = 2> 856_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 857bool operator>(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 858 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 859{ 860 return __lhs.compare(__rhs) > 0; 861} 862 863 864// operator <= 865template<class _CharT, class _Traits> 866_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 867bool operator<=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 868{ 869 return __lhs.compare(__rhs) <= 0; 870} 871 872template<class _CharT, class _Traits, int = 1> 873_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 874bool operator<=(basic_string_view<_CharT, _Traits> __lhs, 875 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT 876{ 877 return __lhs.compare(__rhs) <= 0; 878} 879 880template<class _CharT, class _Traits, int = 2> 881_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 882bool operator<=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 883 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 884{ 885 return __lhs.compare(__rhs) <= 0; 886} 887 888 889// operator >= 890template<class _CharT, class _Traits> 891_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 892bool operator>=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 893{ 894 return __lhs.compare(__rhs) >= 0; 895} 896 897 898template<class _CharT, class _Traits, int = 1> 899_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 900bool operator>=(basic_string_view<_CharT, _Traits> __lhs, 901 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT 902{ 903 return __lhs.compare(__rhs) >= 0; 904} 905 906template<class _CharT, class _Traits, int = 2> 907_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 908bool operator>=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 909 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT 910{ 911 return __lhs.compare(__rhs) >= 0; 912} 913 914 915template<class _CharT, class _Traits> 916basic_ostream<_CharT, _Traits>& 917operator<<(basic_ostream<_CharT, _Traits>& __os, 918 basic_string_view<_CharT, _Traits> __str); 919 920// [string.view.hash] 921template<class _CharT> 922struct _LIBCPP_TEMPLATE_VIS hash<basic_string_view<_CharT, char_traits<_CharT> > > 923 : public __unary_function<basic_string_view<_CharT, char_traits<_CharT> >, size_t> 924{ 925 _LIBCPP_INLINE_VISIBILITY 926 size_t operator()(const basic_string_view<_CharT, char_traits<_CharT> > __val) const _NOEXCEPT { 927 return __do_string_hash(__val.data(), __val.data() + __val.size()); 928 } 929}; 930 931#if _LIBCPP_STD_VER > 11 932inline namespace literals 933{ 934 inline namespace string_view_literals 935 { 936 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 937 basic_string_view<char> operator "" sv(const char *__str, size_t __len) _NOEXCEPT 938 { 939 return basic_string_view<char> (__str, __len); 940 } 941 942#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 943 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 944 basic_string_view<wchar_t> operator "" sv(const wchar_t *__str, size_t __len) _NOEXCEPT 945 { 946 return basic_string_view<wchar_t> (__str, __len); 947 } 948#endif 949 950#ifndef _LIBCPP_HAS_NO_CHAR8_T 951 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 952 basic_string_view<char8_t> operator "" sv(const char8_t *__str, size_t __len) _NOEXCEPT 953 { 954 return basic_string_view<char8_t> (__str, __len); 955 } 956#endif 957 958 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 959 basic_string_view<char16_t> operator "" sv(const char16_t *__str, size_t __len) _NOEXCEPT 960 { 961 return basic_string_view<char16_t> (__str, __len); 962 } 963 964 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 965 basic_string_view<char32_t> operator "" sv(const char32_t *__str, size_t __len) _NOEXCEPT 966 { 967 return basic_string_view<char32_t> (__str, __len); 968 } 969 } // namespace string_view_literals 970} // namespace literals 971#endif 972_LIBCPP_END_NAMESPACE_STD 973 974_LIBCPP_POP_MACROS 975 976#endif // _LIBCPP_STRING_VIEW 977