2 //===------------------------ string_view ---------------------------------===//
4 // The LLVM Compiler Infrastructure
6 // This file is distributed under the University of Illinois Open Source
7 // License. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 #ifndef _LIBCPP_STRING_VIEW
12 #define _LIBCPP_STRING_VIEW
19 // 7.2, Class template basic_string_view
20 template<class charT, class traits = char_traits<charT>>
21 class basic_string_view;
23 // 7.9, basic_string_view non-member comparison functions
24 template<class charT, class traits>
25 constexpr bool operator==(basic_string_view<charT, traits> x,
26 basic_string_view<charT, traits> y) noexcept;
27 template<class charT, class traits>
28 constexpr bool operator!=(basic_string_view<charT, traits> x,
29 basic_string_view<charT, traits> y) noexcept;
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 // see below, sufficient additional overloads of comparison functions
44 // 7.10, Inserters and extractors
45 template<class charT, class traits>
46 basic_ostream<charT, traits>&
47 operator<<(basic_ostream<charT, traits>& os,
48 basic_string_view<charT, traits> str);
50 // basic_string_view typedef names
51 typedef basic_string_view<char> string_view;
52 typedef basic_string_view<char16_t> u16string_view;
53 typedef basic_string_view<char32_t> u32string_view;
54 typedef basic_string_view<wchar_t> wstring_view;
56 template<class charT, class traits = char_traits<charT>>
57 class basic_string_view {
60 typedef traits traits_type;
61 typedef charT value_type;
62 typedef charT* pointer;
63 typedef const charT* const_pointer;
64 typedef charT& reference;
65 typedef const charT& const_reference;
66 typedef implementation-defined const_iterator;
67 typedef const_iterator iterator;
68 typedef reverse_iterator<const_iterator> const_reverse_iterator;
69 typedef const_reverse_iterator reverse_iterator;
70 typedef size_t size_type;
71 typedef ptrdiff_t difference_type;
72 static constexpr size_type npos = size_type(-1);
74 // 7.3, basic_string_view constructors and assignment operators
75 constexpr basic_string_view() noexcept;
76 constexpr basic_string_view(const basic_string_view&) noexcept = default;
77 basic_string_view& operator=(const basic_string_view&) noexcept = default;
78 template<class Allocator>
79 constexpr basic_string_view(const charT* str);
80 constexpr basic_string_view(const charT* str, size_type len);
82 // 7.4, basic_string_view iterator support
83 constexpr const_iterator begin() const noexcept;
84 constexpr const_iterator end() const noexcept;
85 constexpr const_iterator cbegin() const noexcept;
86 constexpr const_iterator cend() const noexcept;
87 const_reverse_iterator rbegin() const noexcept;
88 const_reverse_iterator rend() const noexcept;
89 const_reverse_iterator crbegin() const noexcept;
90 const_reverse_iterator crend() const noexcept;
92 // 7.5, basic_string_view capacity
93 constexpr size_type size() const noexcept;
94 constexpr size_type length() const noexcept;
95 constexpr size_type max_size() const noexcept;
96 constexpr bool empty() const noexcept;
98 // 7.6, basic_string_view element access
99 constexpr const_reference operator[](size_type pos) const;
100 constexpr const_reference at(size_type pos) const;
101 constexpr const_reference front() const;
102 constexpr const_reference back() const;
103 constexpr const_pointer data() const noexcept;
105 // 7.7, basic_string_view modifiers
106 constexpr void remove_prefix(size_type n);
107 constexpr void remove_suffix(size_type n);
108 constexpr void swap(basic_string_view& s) noexcept;
110 size_type copy(charT* s, size_type n, size_type pos = 0) const;
112 constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;
113 constexpr int compare(basic_string_view s) const noexcept;
114 constexpr int compare(size_type pos1, size_type n1, basic_string_view s) const;
115 constexpr int compare(size_type pos1, size_type n1,
116 basic_string_view s, size_type pos2, size_type n2) const;
117 constexpr int compare(const charT* s) const;
118 constexpr int compare(size_type pos1, size_type n1, const charT* s) const;
119 constexpr int compare(size_type pos1, size_type n1,
120 const charT* s, size_type n2) const;
121 constexpr size_type find(basic_string_view s, size_type pos = 0) const noexcept;
122 constexpr size_type find(charT c, size_type pos = 0) const noexcept;
123 constexpr size_type find(const charT* s, size_type pos, size_type n) const;
124 constexpr size_type find(const charT* s, size_type pos = 0) const;
125 constexpr size_type rfind(basic_string_view s, size_type pos = npos) const noexcept;
126 constexpr size_type rfind(charT c, size_type pos = npos) const noexcept;
127 constexpr size_type rfind(const charT* s, size_type pos, size_type n) const;
128 constexpr size_type rfind(const charT* s, size_type pos = npos) const;
129 constexpr size_type find_first_of(basic_string_view s, size_type pos = 0) const noexcept;
130 constexpr size_type find_first_of(charT c, size_type pos = 0) const noexcept;
131 constexpr size_type find_first_of(const charT* s, size_type pos, size_type n) const;
132 constexpr size_type find_first_of(const charT* s, size_type pos = 0) const;
133 constexpr size_type find_last_of(basic_string_view s, size_type pos = npos) const noexcept;
134 constexpr size_type find_last_of(charT c, size_type pos = npos) const noexcept;
135 constexpr size_type find_last_of(const charT* s, size_type pos, size_type n) const;
136 constexpr size_type find_last_of(const charT* s, size_type pos = npos) const;
137 constexpr size_type find_first_not_of(basic_string_view s, size_type pos = 0) const noexcept;
138 constexpr size_type find_first_not_of(charT c, size_type pos = 0) const noexcept;
139 constexpr size_type find_first_not_of(const charT* s, size_type pos, size_type n) const;
140 constexpr size_type find_first_not_of(const charT* s, size_type pos = 0) const;
141 constexpr size_type find_last_not_of(basic_string_view s, size_type pos = npos) const noexcept;
142 constexpr size_type find_last_not_of(charT c, size_type pos = npos) const noexcept;
143 constexpr size_type find_last_not_of(const charT* s, size_type pos, size_type n) const;
144 constexpr size_type find_last_not_of(const charT* s, size_type pos = npos) const;
146 constexpr bool starts_with(basic_string_view s) const noexcept; // C++2a
147 constexpr bool starts_with(charT c) const noexcept; // C++2a
148 constexpr bool starts_with(const charT* s) const; // C++2a
149 constexpr bool ends_with(basic_string_view s) const noexcept; // C++2a
150 constexpr bool ends_with(charT c) const noexcept; // C++2a
151 constexpr bool ends_with(const charT* s) const; // C++2a
154 const_pointer data_; // exposition only
155 size_type size_; // exposition only
158 // 7.11, Hash support
159 template <class T> struct hash;
160 template <> struct hash<string_view>;
161 template <> struct hash<u16string_view>;
162 template <> struct hash<u32string_view>;
163 template <> struct hash<wstring_view>;
165 constexpr basic_string_view<char> operator "" sv( const char *str, size_t len ) noexcept;
166 constexpr basic_string_view<wchar_t> operator "" sv( const wchar_t *str, size_t len ) noexcept;
167 constexpr basic_string_view<char16_t> operator "" sv( const char16_t *str, size_t len ) noexcept;
168 constexpr basic_string_view<char32_t> operator "" sv( const char32_t *str, size_t len ) noexcept;
183 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
184 #pragma GCC system_header
188 #include <__undef_macros>
191 _LIBCPP_BEGIN_NAMESPACE_STD
193 template<class _CharT, class _Traits = char_traits<_CharT> >
194 class _LIBCPP_TEMPLATE_VIS basic_string_view {
197 typedef _Traits traits_type;
198 typedef _CharT value_type;
199 typedef _CharT* pointer;
200 typedef const _CharT* const_pointer;
201 typedef _CharT& reference;
202 typedef const _CharT& const_reference;
203 typedef const_pointer const_iterator; // See [string.view.iterators]
204 typedef const_iterator iterator;
205 typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;
206 typedef const_reverse_iterator reverse_iterator;
207 typedef size_t size_type;
208 typedef ptrdiff_t difference_type;
209 static _LIBCPP_CONSTEXPR const size_type npos = -1; // size_type(-1);
211 static_assert((!is_array<value_type>::value), "Character type of basic_string_view must not be an array");
212 static_assert(( is_standard_layout<value_type>::value), "Character type of basic_string_view must be standard-layout");
213 static_assert(( is_trivial<value_type>::value), "Character type of basic_string_view must be trivial");
214 static_assert((is_same<_CharT, typename traits_type::char_type>::value),
215 "traits_type::char_type must be the same type as CharT");
217 // [string.view.cons], construct/copy
218 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
219 basic_string_view() _NOEXCEPT : __data (nullptr), __size(0) {}
221 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
222 basic_string_view(const basic_string_view&) _NOEXCEPT = default;
224 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
225 basic_string_view& operator=(const basic_string_view&) _NOEXCEPT = default;
227 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
228 basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT
229 : __data(__s), __size(__len)
231 // #if _LIBCPP_STD_VER > 11
232 // _LIBCPP_ASSERT(__len == 0 || __s != nullptr, "string_view::string_view(_CharT *, size_t): received nullptr");
236 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
237 basic_string_view(const _CharT* __s)
238 : __data(__s), __size(_Traits::length(__s)) {}
240 // [string.view.iterators], iterators
241 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
242 const_iterator begin() const _NOEXCEPT { return cbegin(); }
244 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
245 const_iterator end() const _NOEXCEPT { return cend(); }
247 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
248 const_iterator cbegin() const _NOEXCEPT { return __data; }
250 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
251 const_iterator cend() const _NOEXCEPT { return __data + __size; }
253 _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY
254 const_reverse_iterator rbegin() const _NOEXCEPT { return const_reverse_iterator(cend()); }
256 _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY
257 const_reverse_iterator rend() const _NOEXCEPT { return const_reverse_iterator(cbegin()); }
259 _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY
260 const_reverse_iterator crbegin() const _NOEXCEPT { return const_reverse_iterator(cend()); }
262 _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY
263 const_reverse_iterator crend() const _NOEXCEPT { return const_reverse_iterator(cbegin()); }
265 // [string.view.capacity], capacity
266 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
267 size_type size() const _NOEXCEPT { return __size; }
269 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
270 size_type length() const _NOEXCEPT { return __size; }
272 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
273 size_type max_size() const _NOEXCEPT { return numeric_limits<size_type>::max(); }
275 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
276 bool empty() const _NOEXCEPT { return __size == 0; }
278 // [string.view.access], element access
279 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
280 const_reference operator[](size_type __pos) const _NOEXCEPT { return __data[__pos]; }
282 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
283 const_reference at(size_type __pos) const
285 return __pos >= size()
286 ? (__throw_out_of_range("string_view::at"), __data[0])
290 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
291 const_reference front() const
293 return _LIBCPP_ASSERT(!empty(), "string_view::front(): string is empty"), __data[0];
296 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
297 const_reference back() const
299 return _LIBCPP_ASSERT(!empty(), "string_view::back(): string is empty"), __data[__size-1];
302 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
303 const_pointer data() const _NOEXCEPT { return __data; }
305 // [string.view.modifiers], modifiers:
306 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
307 void remove_prefix(size_type __n) _NOEXCEPT
309 _LIBCPP_ASSERT(__n <= size(), "remove_prefix() can't remove more than size()");
314 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
315 void remove_suffix(size_type __n) _NOEXCEPT
317 _LIBCPP_ASSERT(__n <= size(), "remove_suffix() can't remove more than size()");
321 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
322 void swap(basic_string_view& __other) _NOEXCEPT
324 const value_type *__p = __data;
325 __data = __other.__data;
326 __other.__data = __p;
328 size_type __sz = __size;
329 __size = __other.__size;
330 __other.__size = __sz;
333 _LIBCPP_INLINE_VISIBILITY
334 size_type copy(_CharT* __s, size_type __n, size_type __pos = 0) const
337 __throw_out_of_range("string_view::copy");
338 size_type __rlen = _VSTD::min(__n, size() - __pos);
339 _Traits::copy(__s, data() + __pos, __rlen);
343 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
344 basic_string_view substr(size_type __pos = 0, size_type __n = npos) const
346 return __pos > size()
347 ? (__throw_out_of_range("string_view::substr"), basic_string_view())
348 : basic_string_view(data() + __pos, _VSTD::min(__n, size() - __pos));
351 _LIBCPP_CONSTEXPR_AFTER_CXX11 int compare(basic_string_view __sv) const _NOEXCEPT
353 size_type __rlen = _VSTD::min( size(), __sv.size());
354 int __retval = _Traits::compare(data(), __sv.data(), __rlen);
355 if ( __retval == 0 ) // first __rlen chars matched
356 __retval = size() == __sv.size() ? 0 : ( size() < __sv.size() ? -1 : 1 );
360 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
361 int compare(size_type __pos1, size_type __n1, basic_string_view __sv) const
363 return substr(__pos1, __n1).compare(__sv);
366 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
367 int compare( size_type __pos1, size_type __n1,
368 basic_string_view __sv, size_type __pos2, size_type __n2) const
370 return substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2));
373 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
374 int compare(const _CharT* __s) const _NOEXCEPT
376 return compare(basic_string_view(__s));
379 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
380 int compare(size_type __pos1, size_type __n1, const _CharT* __s) const
382 return substr(__pos1, __n1).compare(basic_string_view(__s));
385 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
386 int compare(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2) const
388 return substr(__pos1, __n1).compare(basic_string_view(__s, __n2));
392 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
393 size_type find(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT
395 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr");
396 return __str_find<value_type, size_type, traits_type, npos>
397 (data(), size(), __s.data(), __pos, __s.size());
400 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
401 size_type find(_CharT __c, size_type __pos = 0) const _NOEXCEPT
403 return __str_find<value_type, size_type, traits_type, npos>
404 (data(), size(), __c, __pos);
407 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
408 size_type find(const _CharT* __s, size_type __pos, size_type __n) const
410 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find(): received nullptr");
411 return __str_find<value_type, size_type, traits_type, npos>
412 (data(), size(), __s, __pos, __n);
415 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
416 size_type find(const _CharT* __s, size_type __pos = 0) const
418 _LIBCPP_ASSERT(__s != nullptr, "string_view::find(): received nullptr");
419 return __str_find<value_type, size_type, traits_type, npos>
420 (data(), size(), __s, __pos, traits_type::length(__s));
424 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
425 size_type rfind(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT
427 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr");
428 return __str_rfind<value_type, size_type, traits_type, npos>
429 (data(), size(), __s.data(), __pos, __s.size());
432 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
433 size_type rfind(_CharT __c, size_type __pos = npos) const _NOEXCEPT
435 return __str_rfind<value_type, size_type, traits_type, npos>
436 (data(), size(), __c, __pos);
439 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
440 size_type rfind(const _CharT* __s, size_type __pos, size_type __n) const
442 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::rfind(): received nullptr");
443 return __str_rfind<value_type, size_type, traits_type, npos>
444 (data(), size(), __s, __pos, __n);
447 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
448 size_type rfind(const _CharT* __s, size_type __pos=npos) const
450 _LIBCPP_ASSERT(__s != nullptr, "string_view::rfind(): received nullptr");
451 return __str_rfind<value_type, size_type, traits_type, npos>
452 (data(), size(), __s, __pos, traits_type::length(__s));
456 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
457 size_type find_first_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT
459 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_of(): received nullptr");
460 return __str_find_first_of<value_type, size_type, traits_type, npos>
461 (data(), size(), __s.data(), __pos, __s.size());
464 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
465 size_type find_first_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT
466 { return find(__c, __pos); }
468 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
469 size_type find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
471 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_of(): received nullptr");
472 return __str_find_first_of<value_type, size_type, traits_type, npos>
473 (data(), size(), __s, __pos, __n);
476 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
477 size_type find_first_of(const _CharT* __s, size_type __pos=0) const
479 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_of(): received nullptr");
480 return __str_find_first_of<value_type, size_type, traits_type, npos>
481 (data(), size(), __s, __pos, traits_type::length(__s));
485 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
486 size_type find_last_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT
488 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_of(): received nullptr");
489 return __str_find_last_of<value_type, size_type, traits_type, npos>
490 (data(), size(), __s.data(), __pos, __s.size());
493 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
494 size_type find_last_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT
495 { return rfind(__c, __pos); }
497 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
498 size_type find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
500 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_of(): received nullptr");
501 return __str_find_last_of<value_type, size_type, traits_type, npos>
502 (data(), size(), __s, __pos, __n);
505 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
506 size_type find_last_of(const _CharT* __s, size_type __pos=npos) const
508 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_of(): received nullptr");
509 return __str_find_last_of<value_type, size_type, traits_type, npos>
510 (data(), size(), __s, __pos, traits_type::length(__s));
514 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
515 size_type find_first_not_of(basic_string_view __s, size_type __pos=0) const _NOEXCEPT
517 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_not_of(): received nullptr");
518 return __str_find_first_not_of<value_type, size_type, traits_type, npos>
519 (data(), size(), __s.data(), __pos, __s.size());
522 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
523 size_type find_first_not_of(_CharT __c, size_type __pos=0) const _NOEXCEPT
525 return __str_find_first_not_of<value_type, size_type, traits_type, npos>
526 (data(), size(), __c, __pos);
529 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
530 size_type find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
532 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_not_of(): received nullptr");
533 return __str_find_first_not_of<value_type, size_type, traits_type, npos>
534 (data(), size(), __s, __pos, __n);
537 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
538 size_type find_first_not_of(const _CharT* __s, size_type __pos=0) const
540 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_not_of(): received nullptr");
541 return __str_find_first_not_of<value_type, size_type, traits_type, npos>
542 (data(), size(), __s, __pos, traits_type::length(__s));
546 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
547 size_type find_last_not_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT
549 _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_not_of(): received nullptr");
550 return __str_find_last_not_of<value_type, size_type, traits_type, npos>
551 (data(), size(), __s.data(), __pos, __s.size());
554 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
555 size_type find_last_not_of(_CharT __c, size_type __pos=npos) const _NOEXCEPT
557 return __str_find_last_not_of<value_type, size_type, traits_type, npos>
558 (data(), size(), __c, __pos);
561 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
562 size_type find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
564 _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_not_of(): received nullptr");
565 return __str_find_last_not_of<value_type, size_type, traits_type, npos>
566 (data(), size(), __s, __pos, __n);
569 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
570 size_type find_last_not_of(const _CharT* __s, size_type __pos=npos) const
572 _LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_not_of(): received nullptr");
573 return __str_find_last_not_of<value_type, size_type, traits_type, npos>
574 (data(), size(), __s, __pos, traits_type::length(__s));
577 #if _LIBCPP_STD_VER > 17
578 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
579 bool starts_with(basic_string_view __s) const _NOEXCEPT
580 { return size() >= __s.size() && compare(0, __s.size(), __s) == 0; }
582 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
583 bool starts_with(value_type __c) const _NOEXCEPT
584 { return !empty() && _Traits::eq(front(), __c); }
586 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
587 bool starts_with(const value_type* __s) const _NOEXCEPT
588 { return starts_with(basic_string_view(__s)); }
590 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
591 bool ends_with(basic_string_view __s) const _NOEXCEPT
592 { return size() >= __s.size() && compare(size() - __s.size(), npos, __s) == 0; }
594 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
595 bool ends_with(value_type __c) const _NOEXCEPT
596 { return !empty() && _Traits::eq(back(), __c); }
598 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
599 bool ends_with(const value_type* __s) const _NOEXCEPT
600 { return ends_with(basic_string_view(__s)); }
604 const value_type* __data;
609 // [string.view.comparison]
611 template<class _CharT, class _Traits>
612 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
613 bool operator==(basic_string_view<_CharT, _Traits> __lhs,
614 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
616 if ( __lhs.size() != __rhs.size()) return false;
617 return __lhs.compare(__rhs) == 0;
620 template<class _CharT, class _Traits>
621 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
622 bool operator==(basic_string_view<_CharT, _Traits> __lhs,
623 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
625 if ( __lhs.size() != __rhs.size()) return false;
626 return __lhs.compare(__rhs) == 0;
629 template<class _CharT, class _Traits>
630 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
631 bool operator==(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs,
632 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
634 if ( __lhs.size() != __rhs.size()) return false;
635 return __lhs.compare(__rhs) == 0;
640 template<class _CharT, class _Traits>
641 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
642 bool operator!=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
644 if ( __lhs.size() != __rhs.size())
646 return __lhs.compare(__rhs) != 0;
649 template<class _CharT, class _Traits>
650 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
651 bool operator!=(basic_string_view<_CharT, _Traits> __lhs,
652 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
654 if ( __lhs.size() != __rhs.size())
656 return __lhs.compare(__rhs) != 0;
659 template<class _CharT, class _Traits>
660 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
661 bool operator!=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs,
662 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
664 if ( __lhs.size() != __rhs.size())
666 return __lhs.compare(__rhs) != 0;
671 template<class _CharT, class _Traits>
672 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
673 bool operator<(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
675 return __lhs.compare(__rhs) < 0;
678 template<class _CharT, class _Traits>
679 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
680 bool operator<(basic_string_view<_CharT, _Traits> __lhs,
681 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
683 return __lhs.compare(__rhs) < 0;
686 template<class _CharT, class _Traits>
687 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
688 bool operator<(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs,
689 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
691 return __lhs.compare(__rhs) < 0;
696 template<class _CharT, class _Traits>
697 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
698 bool operator> (basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
700 return __lhs.compare(__rhs) > 0;
703 template<class _CharT, class _Traits>
704 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
705 bool operator>(basic_string_view<_CharT, _Traits> __lhs,
706 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
708 return __lhs.compare(__rhs) > 0;
711 template<class _CharT, class _Traits>
712 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
713 bool operator>(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs,
714 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
716 return __lhs.compare(__rhs) > 0;
721 template<class _CharT, class _Traits>
722 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
723 bool operator<=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
725 return __lhs.compare(__rhs) <= 0;
728 template<class _CharT, class _Traits>
729 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
730 bool operator<=(basic_string_view<_CharT, _Traits> __lhs,
731 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
733 return __lhs.compare(__rhs) <= 0;
736 template<class _CharT, class _Traits>
737 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
738 bool operator<=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs,
739 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
741 return __lhs.compare(__rhs) <= 0;
746 template<class _CharT, class _Traits>
747 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
748 bool operator>=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
750 return __lhs.compare(__rhs) >= 0;
754 template<class _CharT, class _Traits>
755 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
756 bool operator>=(basic_string_view<_CharT, _Traits> __lhs,
757 typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
759 return __lhs.compare(__rhs) >= 0;
762 template<class _CharT, class _Traits>
763 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
764 bool operator>=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs,
765 basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
767 return __lhs.compare(__rhs) >= 0;
770 typedef basic_string_view<char> string_view;
771 typedef basic_string_view<char16_t> u16string_view;
772 typedef basic_string_view<char32_t> u32string_view;
773 typedef basic_string_view<wchar_t> wstring_view;
775 // [string.view.hash]
776 template<class _CharT, class _Traits>
777 struct _LIBCPP_TEMPLATE_VIS hash<basic_string_view<_CharT, _Traits> >
778 : public unary_function<basic_string_view<_CharT, _Traits>, size_t>
780 size_t operator()(const basic_string_view<_CharT, _Traits> __val) const _NOEXCEPT;
783 template<class _CharT, class _Traits>
785 hash<basic_string_view<_CharT, _Traits> >::operator()(
786 const basic_string_view<_CharT, _Traits> __val) const _NOEXCEPT
788 return __do_string_hash(__val.data(), __val.data() + __val.size());
792 #if _LIBCPP_STD_VER > 11
793 inline namespace literals
795 inline namespace string_view_literals
797 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
798 basic_string_view<char> operator "" sv(const char *__str, size_t __len) _NOEXCEPT
800 return basic_string_view<char> (__str, __len);
803 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
804 basic_string_view<wchar_t> operator "" sv(const wchar_t *__str, size_t __len) _NOEXCEPT
806 return basic_string_view<wchar_t> (__str, __len);
809 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
810 basic_string_view<char16_t> operator "" sv(const char16_t *__str, size_t __len) _NOEXCEPT
812 return basic_string_view<char16_t> (__str, __len);
815 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
816 basic_string_view<char32_t> operator "" sv(const char32_t *__str, size_t __len) _NOEXCEPT
818 return basic_string_view<char32_t> (__str, __len);
823 _LIBCPP_END_NAMESPACE_STD
827 #endif // _LIBCPP_STRING_VIEW