libstdc++
string_view
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1// Components for manipulating non-owning sequences of characters -*- C++ -*-
2
3// Copyright (C) 2013-2020 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file string_view
26 * This is a Standard C++ Library header.
27 */
28
29//
30// N3762 basic_string_view library
31//
32
33#ifndef _GLIBCXX_STRING_VIEW
34#define _GLIBCXX_STRING_VIEW 1
35
36#pragma GCC system_header
37
38#if __cplusplus >= 201703L
39
40#include <iosfwd>
41#include <bits/char_traits.h>
43#include <bits/int_limits.h>
44#include <bits/range_access.h>
45#include <bits/ostream_insert.h>
46
47namespace std _GLIBCXX_VISIBILITY(default)
48{
49_GLIBCXX_BEGIN_NAMESPACE_VERSION
50
51#define __cpp_lib_string_view 201803
52
53 // Helper for basic_string and basic_string_view members.
54 constexpr size_t
55 __sv_check(size_t __size, size_t __pos, const char* __s)
56 {
57 if (__pos > __size)
58 __throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > __size "
59 "(which is %zu)"), __s, __pos, __size);
60 return __pos;
61 }
62
63 // Helper for basic_string members.
64 // NB: __sv_limit doesn't check for a bad __pos value.
65 constexpr size_t
66 __sv_limit(size_t __size, size_t __pos, size_t __off) noexcept
67 {
68 const bool __testoff = __off < __size - __pos;
69 return __testoff ? __off : __size - __pos;
70 }
71
72 /**
73 * @class basic_string_view <string_view>
74 * @brief A non-owning reference to a string.
75 *
76 * @ingroup strings
77 * @ingroup sequences
78 *
79 * @tparam _CharT Type of character
80 * @tparam _Traits Traits for character type, defaults to
81 * char_traits<_CharT>.
82 *
83 * A basic_string_view looks like this:
84 *
85 * @code
86 * _CharT* _M_str
87 * size_t _M_len
88 * @endcode
89 */
90 template<typename _CharT, typename _Traits = std::char_traits<_CharT>>
91 class basic_string_view
92 {
93 static_assert(!is_array_v<_CharT>);
94 static_assert(is_trivial_v<_CharT> && is_standard_layout_v<_CharT>);
95 static_assert(is_same_v<_CharT, typename _Traits::char_type>);
96
97 public:
98
99 // types
100 using traits_type = _Traits;
101 using value_type = _CharT;
102 using pointer = value_type*;
103 using const_pointer = const value_type*;
104 using reference = value_type&;
105 using const_reference = const value_type&;
106 using const_iterator = const value_type*;
107 using iterator = const_iterator;
108 using const_reverse_iterator = std::reverse_iterator<const_iterator>;
109 using reverse_iterator = const_reverse_iterator;
110 using size_type = size_t;
111 using difference_type = ptrdiff_t;
112 static constexpr size_type npos = size_type(-1);
113
114 // [string.view.cons], construction and assignment
115
116 constexpr
117 basic_string_view() noexcept
118 : _M_len{0}, _M_str{nullptr}
119 { }
120
121 constexpr basic_string_view(const basic_string_view&) noexcept = default;
122
123 __attribute__((__nonnull__)) constexpr
124 basic_string_view(const _CharT* __str) noexcept
125 : _M_len{traits_type::length(__str)},
126 _M_str{__str}
127 { }
128
129 constexpr
130 basic_string_view(const _CharT* __str, size_type __len) noexcept
131 : _M_len{__len}, _M_str{__str}
132 { }
133
134#if __cplusplus > 201703L && __cpp_lib_concepts
135 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
136 requires same_as<iter_value_t<_It>, _CharT>
137 && (!convertible_to<_End, size_type>)
138 constexpr
139 basic_string_view(_It __first, _End __last)
140 : _M_len(__last - __first), _M_str(std::to_address(__first))
141 { }
142#endif
143
144 constexpr basic_string_view&
145 operator=(const basic_string_view&) noexcept = default;
146
147 // [string.view.iterators], iterator support
148
149 constexpr const_iterator
150 begin() const noexcept
151 { return this->_M_str; }
152
153 constexpr const_iterator
154 end() const noexcept
155 { return this->_M_str + this->_M_len; }
156
157 constexpr const_iterator
158 cbegin() const noexcept
159 { return this->_M_str; }
160
161 constexpr const_iterator
162 cend() const noexcept
163 { return this->_M_str + this->_M_len; }
164
165 constexpr const_reverse_iterator
166 rbegin() const noexcept
167 { return const_reverse_iterator(this->end()); }
168
169 constexpr const_reverse_iterator
170 rend() const noexcept
171 { return const_reverse_iterator(this->begin()); }
172
173 constexpr const_reverse_iterator
174 crbegin() const noexcept
175 { return const_reverse_iterator(this->end()); }
176
177 constexpr const_reverse_iterator
178 crend() const noexcept
179 { return const_reverse_iterator(this->begin()); }
180
181 // [string.view.capacity], capacity
182
183 constexpr size_type
184 size() const noexcept
185 { return this->_M_len; }
186
187 constexpr size_type
188 length() const noexcept
189 { return _M_len; }
190
191 constexpr size_type
192 max_size() const noexcept
193 {
194 return (npos - sizeof(size_type) - sizeof(void*))
195 / sizeof(value_type) / 4;
196 }
197
198 [[nodiscard]] constexpr bool
199 empty() const noexcept
200 { return this->_M_len == 0; }
201
202 // [string.view.access], element access
203
204 constexpr const_reference
205 operator[](size_type __pos) const noexcept
206 {
207 // TODO: Assert to restore in a way compatible with the constexpr.
208 // __glibcxx_assert(__pos < this->_M_len);
209 return *(this->_M_str + __pos);
210 }
211
212 constexpr const_reference
213 at(size_type __pos) const
214 {
215 if (__pos >= _M_len)
216 __throw_out_of_range_fmt(__N("basic_string_view::at: __pos "
217 "(which is %zu) >= this->size() "
218 "(which is %zu)"), __pos, this->size());
219 return *(this->_M_str + __pos);
220 }
221
222 constexpr const_reference
223 front() const noexcept
224 {
225 // TODO: Assert to restore in a way compatible with the constexpr.
226 // __glibcxx_assert(this->_M_len > 0);
227 return *this->_M_str;
228 }
229
230 constexpr const_reference
231 back() const noexcept
232 {
233 // TODO: Assert to restore in a way compatible with the constexpr.
234 // __glibcxx_assert(this->_M_len > 0);
235 return *(this->_M_str + this->_M_len - 1);
236 }
237
238 constexpr const_pointer
239 data() const noexcept
240 { return this->_M_str; }
241
242 // [string.view.modifiers], modifiers:
243
244 constexpr void
245 remove_prefix(size_type __n) noexcept
246 {
247 __glibcxx_assert(this->_M_len >= __n);
248 this->_M_str += __n;
249 this->_M_len -= __n;
250 }
251
252 constexpr void
253 remove_suffix(size_type __n) noexcept
254 { this->_M_len -= __n; }
255
256 constexpr void
257 swap(basic_string_view& __sv) noexcept
258 {
259 auto __tmp = *this;
260 *this = __sv;
261 __sv = __tmp;
262 }
263
264 // [string.view.ops], string operations:
265
266 _GLIBCXX20_CONSTEXPR
267 size_type
268 copy(_CharT* __str, size_type __n, size_type __pos = 0) const
269 {
270 __glibcxx_requires_string_len(__str, __n);
271 __pos = std::__sv_check(size(), __pos, "basic_string_view::copy");
272 const size_type __rlen = std::min(__n, _M_len - __pos);
273 // _GLIBCXX_RESOLVE_LIB_DEFECTS
274 // 2777. basic_string_view::copy should use char_traits::copy
275 traits_type::copy(__str, data() + __pos, __rlen);
276 return __rlen;
277 }
278
279 constexpr basic_string_view
280 substr(size_type __pos = 0, size_type __n = npos) const noexcept(false)
281 {
282 __pos = std::__sv_check(size(), __pos, "basic_string_view::substr");
283 const size_type __rlen = std::min(__n, _M_len - __pos);
284 return basic_string_view{_M_str + __pos, __rlen};
285 }
286
287 constexpr int
288 compare(basic_string_view __str) const noexcept
289 {
290 const size_type __rlen = std::min(this->_M_len, __str._M_len);
291 int __ret = traits_type::compare(this->_M_str, __str._M_str, __rlen);
292 if (__ret == 0)
293 __ret = _S_compare(this->_M_len, __str._M_len);
294 return __ret;
295 }
296
297 constexpr int
298 compare(size_type __pos1, size_type __n1, basic_string_view __str) const
299 { return this->substr(__pos1, __n1).compare(__str); }
300
301 constexpr int
302 compare(size_type __pos1, size_type __n1,
303 basic_string_view __str, size_type __pos2, size_type __n2) const
304 {
305 return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2));
306 }
307
308 __attribute__((__nonnull__)) constexpr int
309 compare(const _CharT* __str) const noexcept
310 { return this->compare(basic_string_view{__str}); }
311
312 __attribute__((__nonnull__)) constexpr int
313 compare(size_type __pos1, size_type __n1, const _CharT* __str) const
314 { return this->substr(__pos1, __n1).compare(basic_string_view{__str}); }
315
316 constexpr int
317 compare(size_type __pos1, size_type __n1,
318 const _CharT* __str, size_type __n2) const noexcept(false)
319 {
320 return this->substr(__pos1, __n1)
321 .compare(basic_string_view(__str, __n2));
322 }
323
324#if __cplusplus > 201703L
325 constexpr bool
326 starts_with(basic_string_view __x) const noexcept
327 { return this->substr(0, __x.size()) == __x; }
328
329 constexpr bool
330 starts_with(_CharT __x) const noexcept
331 { return !this->empty() && traits_type::eq(this->front(), __x); }
332
333 constexpr bool
334 starts_with(const _CharT* __x) const noexcept
335 { return this->starts_with(basic_string_view(__x)); }
336
337 constexpr bool
338 ends_with(basic_string_view __x) const noexcept
339 {
340 return this->size() >= __x.size()
341 && this->compare(this->size() - __x.size(), npos, __x) == 0;
342 }
343
344 constexpr bool
345 ends_with(_CharT __x) const noexcept
346 { return !this->empty() && traits_type::eq(this->back(), __x); }
347
348 constexpr bool
349 ends_with(const _CharT* __x) const noexcept
350 { return this->ends_with(basic_string_view(__x)); }
351#endif // C++20
352
353 // [string.view.find], searching
354
355 constexpr size_type
356 find(basic_string_view __str, size_type __pos = 0) const noexcept
357 { return this->find(__str._M_str, __pos, __str._M_len); }
358
359 constexpr size_type
360 find(_CharT __c, size_type __pos = 0) const noexcept;
361
362 constexpr size_type
363 find(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
364
365 __attribute__((__nonnull__)) constexpr size_type
366 find(const _CharT* __str, size_type __pos = 0) const noexcept
367 { return this->find(__str, __pos, traits_type::length(__str)); }
368
369 constexpr size_type
370 rfind(basic_string_view __str, size_type __pos = npos) const noexcept
371 { return this->rfind(__str._M_str, __pos, __str._M_len); }
372
373 constexpr size_type
374 rfind(_CharT __c, size_type __pos = npos) const noexcept;
375
376 constexpr size_type
377 rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
378
379 __attribute__((__nonnull__)) constexpr size_type
380 rfind(const _CharT* __str, size_type __pos = npos) const noexcept
381 { return this->rfind(__str, __pos, traits_type::length(__str)); }
382
383 constexpr size_type
384 find_first_of(basic_string_view __str, size_type __pos = 0) const noexcept
385 { return this->find_first_of(__str._M_str, __pos, __str._M_len); }
386
387 constexpr size_type
388 find_first_of(_CharT __c, size_type __pos = 0) const noexcept
389 { return this->find(__c, __pos); }
390
391 constexpr size_type
392 find_first_of(const _CharT* __str, size_type __pos,
393 size_type __n) const noexcept;
394
395 __attribute__((__nonnull__)) constexpr size_type
396 find_first_of(const _CharT* __str, size_type __pos = 0) const noexcept
397 { return this->find_first_of(__str, __pos, traits_type::length(__str)); }
398
399 constexpr size_type
400 find_last_of(basic_string_view __str,
401 size_type __pos = npos) const noexcept
402 { return this->find_last_of(__str._M_str, __pos, __str._M_len); }
403
404 constexpr size_type
405 find_last_of(_CharT __c, size_type __pos=npos) const noexcept
406 { return this->rfind(__c, __pos); }
407
408 constexpr size_type
409 find_last_of(const _CharT* __str, size_type __pos,
410 size_type __n) const noexcept;
411
412 __attribute__((__nonnull__)) constexpr size_type
413 find_last_of(const _CharT* __str, size_type __pos = npos) const noexcept
414 { return this->find_last_of(__str, __pos, traits_type::length(__str)); }
415
416 constexpr size_type
417 find_first_not_of(basic_string_view __str,
418 size_type __pos = 0) const noexcept
419 { return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
420
421 constexpr size_type
422 find_first_not_of(_CharT __c, size_type __pos = 0) const noexcept;
423
424 constexpr size_type
425 find_first_not_of(const _CharT* __str,
426 size_type __pos, size_type __n) const noexcept;
427
428 __attribute__((__nonnull__)) constexpr size_type
429 find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept
430 {
431 return this->find_first_not_of(__str, __pos,
432 traits_type::length(__str));
433 }
434
435 constexpr size_type
436 find_last_not_of(basic_string_view __str,
437 size_type __pos = npos) const noexcept
438 { return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
439
440 constexpr size_type
441 find_last_not_of(_CharT __c, size_type __pos = npos) const noexcept;
442
443 constexpr size_type
444 find_last_not_of(const _CharT* __str,
445 size_type __pos, size_type __n) const noexcept;
446
447 __attribute__((__nonnull__)) constexpr size_type
448 find_last_not_of(const _CharT* __str,
449 size_type __pos = npos) const noexcept
450 {
451 return this->find_last_not_of(__str, __pos,
452 traits_type::length(__str));
453 }
454
455 private:
456
457 static constexpr int
458 _S_compare(size_type __n1, size_type __n2) noexcept
459 {
460 const difference_type __diff = __n1 - __n2;
465 return static_cast<int>(__diff);
466 }
467
468 size_t _M_len;
469 const _CharT* _M_str;
470 };
471
472#if __cplusplus > 201703L && __cpp_lib_concepts && __cpp_deduction_guides
473 template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
474 basic_string_view(_It, _End) -> basic_string_view<iter_value_t<_It>>;
475#endif
476
477 // [string.view.comparison], non-member basic_string_view comparison function
478
479 // Several of these functions use type_identity_t to create a non-deduced
480 // context, so that only one argument participates in template argument
481 // deduction and the other argument gets implicitly converted to the deduced
482 // type (see N3766).
483
484 template<typename _CharT, typename _Traits>
485 constexpr bool
486 operator==(basic_string_view<_CharT, _Traits> __x,
487 basic_string_view<_CharT, _Traits> __y) noexcept
488 { return __x.size() == __y.size() && __x.compare(__y) == 0; }
489
490 template<typename _CharT, typename _Traits>
491 constexpr bool
492 operator==(basic_string_view<_CharT, _Traits> __x,
493 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
494 noexcept
495 { return __x.size() == __y.size() && __x.compare(__y) == 0; }
496
497 template<typename _CharT, typename _Traits>
498 constexpr bool
499 operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
500 basic_string_view<_CharT, _Traits> __y) noexcept
501 { return __x.size() == __y.size() && __x.compare(__y) == 0; }
502
503 template<typename _CharT, typename _Traits>
504 constexpr bool
505 operator!=(basic_string_view<_CharT, _Traits> __x,
506 basic_string_view<_CharT, _Traits> __y) noexcept
507 { return !(__x == __y); }
508
509 template<typename _CharT, typename _Traits>
510 constexpr bool
511 operator!=(basic_string_view<_CharT, _Traits> __x,
512 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
513 noexcept
514 { return !(__x == __y); }
515
516 template<typename _CharT, typename _Traits>
517 constexpr bool
518 operator!=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
519 basic_string_view<_CharT, _Traits> __y) noexcept
520 { return !(__x == __y); }
521
522 template<typename _CharT, typename _Traits>
523 constexpr bool
524 operator< (basic_string_view<_CharT, _Traits> __x,
525 basic_string_view<_CharT, _Traits> __y) noexcept
526 { return __x.compare(__y) < 0; }
527
528 template<typename _CharT, typename _Traits>
529 constexpr bool
530 operator< (basic_string_view<_CharT, _Traits> __x,
531 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
532 noexcept
533 { return __x.compare(__y) < 0; }
534
535 template<typename _CharT, typename _Traits>
536 constexpr bool
537 operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
538 basic_string_view<_CharT, _Traits> __y) noexcept
539 { return __x.compare(__y) < 0; }
540
541 template<typename _CharT, typename _Traits>
542 constexpr bool
543 operator> (basic_string_view<_CharT, _Traits> __x,
544 basic_string_view<_CharT, _Traits> __y) noexcept
545 { return __x.compare(__y) > 0; }
546
547 template<typename _CharT, typename _Traits>
548 constexpr bool
549 operator> (basic_string_view<_CharT, _Traits> __x,
550 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
551 noexcept
552 { return __x.compare(__y) > 0; }
553
554 template<typename _CharT, typename _Traits>
555 constexpr bool
556 operator> (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
557 basic_string_view<_CharT, _Traits> __y) noexcept
558 { return __x.compare(__y) > 0; }
559
560 template<typename _CharT, typename _Traits>
561 constexpr bool
562 operator<=(basic_string_view<_CharT, _Traits> __x,
563 basic_string_view<_CharT, _Traits> __y) noexcept
564 { return __x.compare(__y) <= 0; }
565
566 template<typename _CharT, typename _Traits>
567 constexpr bool
568 operator<=(basic_string_view<_CharT, _Traits> __x,
569 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
570 noexcept
571 { return __x.compare(__y) <= 0; }
572
573 template<typename _CharT, typename _Traits>
574 constexpr bool
575 operator<=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
576 basic_string_view<_CharT, _Traits> __y) noexcept
577 { return __x.compare(__y) <= 0; }
578
579 template<typename _CharT, typename _Traits>
580 constexpr bool
581 operator>=(basic_string_view<_CharT, _Traits> __x,
582 basic_string_view<_CharT, _Traits> __y) noexcept
583 { return __x.compare(__y) >= 0; }
584
585 template<typename _CharT, typename _Traits>
586 constexpr bool
587 operator>=(basic_string_view<_CharT, _Traits> __x,
588 __type_identity_t<basic_string_view<_CharT, _Traits>> __y)
589 noexcept
590 { return __x.compare(__y) >= 0; }
591
592 template<typename _CharT, typename _Traits>
593 constexpr bool
594 operator>=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
595 basic_string_view<_CharT, _Traits> __y) noexcept
596 { return __x.compare(__y) >= 0; }
597
598 // [string.view.io], Inserters and extractors
599 template<typename _CharT, typename _Traits>
600 inline basic_ostream<_CharT, _Traits>&
601 operator<<(basic_ostream<_CharT, _Traits>& __os,
602 basic_string_view<_CharT,_Traits> __str)
603 { return __ostream_insert(__os, __str.data(), __str.size()); }
604
605
606 // basic_string_view typedef names
607
608 using string_view = basic_string_view<char>;
609#ifdef _GLIBCXX_USE_WCHAR_T
610 using wstring_view = basic_string_view<wchar_t>;
611#endif
612#ifdef _GLIBCXX_USE_CHAR8_T
613 using u8string_view = basic_string_view<char8_t>;
614#endif
615 using u16string_view = basic_string_view<char16_t>;
616 using u32string_view = basic_string_view<char32_t>;
617
618 // [string.view.hash], hash support:
619
620 template<typename _Tp>
621 struct hash;
622
623 template<>
624 struct hash<string_view>
625 : public __hash_base<size_t, string_view>
626 {
627 size_t
628 operator()(const string_view& __str) const noexcept
629 { return std::_Hash_impl::hash(__str.data(), __str.length()); }
630 };
631
632 template<>
633 struct __is_fast_hash<hash<string_view>> : std::false_type
634 { };
635
636#ifdef _GLIBCXX_USE_WCHAR_T
637 template<>
638 struct hash<wstring_view>
639 : public __hash_base<size_t, wstring_view>
640 {
641 size_t
642 operator()(const wstring_view& __s) const noexcept
643 { return std::_Hash_impl::hash(__s.data(),
644 __s.length() * sizeof(wchar_t)); }
645 };
646
647 template<>
648 struct __is_fast_hash<hash<wstring_view>> : std::false_type
649 { };
650#endif
651
652#ifdef _GLIBCXX_USE_CHAR8_T
653 template<>
654 struct hash<u8string_view>
655 : public __hash_base<size_t, u8string_view>
656 {
657 size_t
658 operator()(const u8string_view& __str) const noexcept
659 { return std::_Hash_impl::hash(__str.data(), __str.length()); }
660 };
661
662 template<>
663 struct __is_fast_hash<hash<u8string_view>> : std::false_type
664 { };
665#endif
666
667 template<>
668 struct hash<u16string_view>
669 : public __hash_base<size_t, u16string_view>
670 {
671 size_t
672 operator()(const u16string_view& __s) const noexcept
673 { return std::_Hash_impl::hash(__s.data(),
674 __s.length() * sizeof(char16_t)); }
675 };
676
677 template<>
678 struct __is_fast_hash<hash<u16string_view>> : std::false_type
679 { };
680
681 template<>
682 struct hash<u32string_view>
683 : public __hash_base<size_t, u32string_view>
684 {
685 size_t
686 operator()(const u32string_view& __s) const noexcept
687 { return std::_Hash_impl::hash(__s.data(),
688 __s.length() * sizeof(char32_t)); }
689 };
690
691 template<>
692 struct __is_fast_hash<hash<u32string_view>> : std::false_type
693 { };
694
695 inline namespace literals
696 {
697 inline namespace string_view_literals
698 {
699#pragma GCC diagnostic push
700#pragma GCC diagnostic ignored "-Wliteral-suffix"
701 inline constexpr basic_string_view<char>
702 operator""sv(const char* __str, size_t __len) noexcept
703 { return basic_string_view<char>{__str, __len}; }
704
705#ifdef _GLIBCXX_USE_WCHAR_T
706 inline constexpr basic_string_view<wchar_t>
707 operator""sv(const wchar_t* __str, size_t __len) noexcept
708 { return basic_string_view<wchar_t>{__str, __len}; }
709#endif
710
711#ifdef _GLIBCXX_USE_CHAR8_T
712 inline constexpr basic_string_view<char8_t>
713 operator""sv(const char8_t* __str, size_t __len) noexcept
714 { return basic_string_view<char8_t>{__str, __len}; }
715#endif
716
717 inline constexpr basic_string_view<char16_t>
718 operator""sv(const char16_t* __str, size_t __len) noexcept
719 { return basic_string_view<char16_t>{__str, __len}; }
720
721 inline constexpr basic_string_view<char32_t>
722 operator""sv(const char32_t* __str, size_t __len) noexcept
723 { return basic_string_view<char32_t>{__str, __len}; }
724
725#pragma GCC diagnostic pop
726 } // namespace string_literals
727 } // namespace literals
728
729#if __cpp_lib_concepts
730 namespace ranges
731 {
732 // Opt-in to borrowed_range concept
733 template<typename _CharT, typename _Traits>
734 inline constexpr bool
735 enable_borrowed_range<basic_string_view<_CharT, _Traits>> = true;
736
737 // Opt-in to view concept
738 template<typename _CharT, typename _Traits>
739 inline constexpr bool
740 enable_view<basic_string_view<_CharT, _Traits>> = true;
741 }
742#endif
743_GLIBCXX_END_NAMESPACE_VERSION
744} // namespace std
745
746#include <bits/string_view.tcc>
747
748#endif // __cplusplus <= 201402L
749
750#endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW
_Tp * begin(valarray< _Tp > &__va)
Return an iterator pointing to the first element of the valarray.
Definition: valarray:1214
_Tp * end(valarray< _Tp > &__va)
Return an iterator pointing to one past the last element of the valarray.
Definition: valarray:1234
constexpr const _Tp & max(const _Tp &, const _Tp &)
This does what you think it does.
Definition: stl_algobase.h:254
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
Definition: stl_algobase.h:230
ISO C++ entities toplevel namespace is std.
constexpr auto crend(const _Container &__cont) -> decltype(std::rend(__cont))
Return a reverse iterator pointing one past the first element of the const container.
Definition: range_access.h:231
constexpr auto rend(_Container &__cont) -> decltype(__cont.rend())
Return a reverse iterator pointing one past the first element of the container.
Definition: range_access.h:161
constexpr auto cend(const _Container &__cont) noexcept(noexcept(std::end(__cont))) -> decltype(std::end(__cont))
Return an iterator pointing to one past the last element of the const container.
Definition: range_access.h:130
constexpr auto rbegin(_Container &__cont) -> decltype(__cont.rbegin())
Return a reverse iterator pointing to the last element of the container.
Definition: range_access.h:141
constexpr auto crbegin(const _Container &__cont) -> decltype(std::rbegin(__cont))
Return a reverse iterator pointing to the last element of the const container.
Definition: range_access.h:221
constexpr auto cbegin(const _Container &__cont) noexcept(noexcept(std::begin(__cont))) -> decltype(std::begin(__cont))
Return an iterator pointing to the first element of the const container.
Definition: range_access.h:119
integral_constant
Definition: type_traits:58