summaryrefslogtreecommitdiff
path: root/data/iphoneos-sdk/v1/string_view
blob: 72cf816e8d5225e7b2fbf49b3d336983b8bf223d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
// -*- C++ -*-
//===------------------------ string_view ---------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_STRING_VIEW
#define _LIBCPP_STRING_VIEW

/*
string_view synopsis

namespace std {

    // 7.2, Class template basic_string_view
    template<class charT, class traits = char_traits<charT>>
        class basic_string_view;

    // 7.9, basic_string_view non-member comparison functions
    template<class charT, class traits>
    constexpr bool operator==(basic_string_view<charT, traits> x,
                              basic_string_view<charT, traits> y) noexcept;
    template<class charT, class traits>
    constexpr bool operator!=(basic_string_view<charT, traits> x,
                              basic_string_view<charT, traits> y) noexcept;
    template<class charT, class traits>
    constexpr bool operator< (basic_string_view<charT, traits> x,
                                 basic_string_view<charT, traits> y) noexcept;
    template<class charT, class traits>
    constexpr bool operator> (basic_string_view<charT, traits> x,
                              basic_string_view<charT, traits> y) noexcept;
    template<class charT, class traits>
    constexpr bool operator<=(basic_string_view<charT, traits> x,
                                 basic_string_view<charT, traits> y) noexcept;
    template<class charT, class traits>
    constexpr bool operator>=(basic_string_view<charT, traits> x,
                              basic_string_view<charT, traits> y) noexcept;
    // see below, sufficient additional overloads of comparison functions

    // 7.10, Inserters and extractors
    template<class charT, class traits>
      basic_ostream<charT, traits>&
        operator<<(basic_ostream<charT, traits>& os,
                   basic_string_view<charT, traits> str);

    // basic_string_view typedef names
    typedef basic_string_view<char> string_view;
    typedef basic_string_view<char16_t> u16string_view;
    typedef basic_string_view<char32_t> u32string_view;
    typedef basic_string_view<wchar_t> wstring_view;

    template<class charT, class traits = char_traits<charT>>
    class basic_string_view {
      public:
      // types
      typedef traits traits_type;
      typedef charT value_type;
      typedef charT* pointer;
      typedef const charT* const_pointer;
      typedef charT& reference;
      typedef const charT& const_reference;
      typedef implementation-defined const_iterator;
      typedef const_iterator iterator;
      typedef reverse_iterator<const_iterator> const_reverse_iterator;
      typedef const_reverse_iterator reverse_iterator;
      typedef size_t size_type;
      typedef ptrdiff_t difference_type;
      static constexpr size_type npos = size_type(-1);

      // 7.3, basic_string_view constructors and assignment operators
      constexpr basic_string_view() noexcept;
      constexpr basic_string_view(const basic_string_view&) noexcept = default;
      basic_string_view& operator=(const basic_string_view&) noexcept = default;
      template<class Allocator>
      constexpr basic_string_view(const charT* str);
      constexpr basic_string_view(const charT* str, size_type len);

      // 7.4, basic_string_view iterator support
      constexpr const_iterator begin() const noexcept;
      constexpr const_iterator end() const noexcept;
      constexpr const_iterator cbegin() const noexcept;
      constexpr const_iterator cend() const noexcept;
      const_reverse_iterator rbegin() const noexcept;
      const_reverse_iterator rend() const noexcept;
      const_reverse_iterator crbegin() const noexcept;
      const_reverse_iterator crend() const noexcept;

      // 7.5, basic_string_view capacity
      constexpr size_type size() const noexcept;
      constexpr size_type length() const noexcept;
      constexpr size_type max_size() const noexcept;
      constexpr bool empty() const noexcept;

      // 7.6, basic_string_view element access
      constexpr const_reference operator[](size_type pos) const;
      constexpr const_reference at(size_type pos) const;
      constexpr const_reference front() const;
      constexpr const_reference back() const;
      constexpr const_pointer data() const noexcept;

      // 7.7, basic_string_view modifiers
      constexpr void remove_prefix(size_type n);
      constexpr void remove_suffix(size_type n);
      constexpr void swap(basic_string_view& s) noexcept;

      size_type copy(charT* s, size_type n, size_type pos = 0) const;

      constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;
      constexpr int compare(basic_string_view s) const noexcept;
      constexpr int compare(size_type pos1, size_type n1, basic_string_view s) const;
      constexpr int compare(size_type pos1, size_type n1,
                            basic_string_view s, size_type pos2, size_type n2) const;
      constexpr int compare(const charT* s) const;
      constexpr int compare(size_type pos1, size_type n1, const charT* s) const;
      constexpr int compare(size_type pos1, size_type n1,
                            const charT* s, size_type n2) const;
      constexpr size_type find(basic_string_view s, size_type pos = 0) const noexcept;
      constexpr size_type find(charT c, size_type pos = 0) const noexcept;
      constexpr size_type find(const charT* s, size_type pos, size_type n) const;
      constexpr size_type find(const charT* s, size_type pos = 0) const;
      constexpr size_type rfind(basic_string_view s, size_type pos = npos) const noexcept;
      constexpr size_type rfind(charT c, size_type pos = npos) const noexcept;
      constexpr size_type rfind(const charT* s, size_type pos, size_type n) const;
      constexpr size_type rfind(const charT* s, size_type pos = npos) const;
      constexpr size_type find_first_of(basic_string_view s, size_type pos = 0) const noexcept;
      constexpr size_type find_first_of(charT c, size_type pos = 0) const noexcept;
      constexpr size_type find_first_of(const charT* s, size_type pos, size_type n) const;
      constexpr size_type find_first_of(const charT* s, size_type pos = 0) const;
      constexpr size_type find_last_of(basic_string_view s, size_type pos = npos) const noexcept;
      constexpr size_type find_last_of(charT c, size_type pos = npos) const noexcept;
      constexpr size_type find_last_of(const charT* s, size_type pos, size_type n) const;
      constexpr size_type find_last_of(const charT* s, size_type pos = npos) const;
      constexpr size_type find_first_not_of(basic_string_view s, size_type pos = 0) const noexcept;
      constexpr size_type find_first_not_of(charT c, size_type pos = 0) const noexcept;
      constexpr size_type find_first_not_of(const charT* s, size_type pos, size_type n) const;
      constexpr size_type find_first_not_of(const charT* s, size_type pos = 0) const;
      constexpr size_type find_last_not_of(basic_string_view s, size_type pos = npos) const noexcept;
      constexpr size_type find_last_not_of(charT c, size_type pos = npos) const noexcept;
      constexpr size_type find_last_not_of(const charT* s, size_type pos, size_type n) const;
      constexpr size_type find_last_not_of(const charT* s, size_type pos = npos) const;

      constexpr bool starts_with(basic_string_view s) const noexcept; // C++2a
      constexpr bool starts_with(charT c) const noexcept;             // C++2a
      constexpr bool starts_with(const charT* s) const;               // C++2a
      constexpr bool ends_with(basic_string_view s) const noexcept;   // C++2a
      constexpr bool ends_with(charT c) const noexcept;               // C++2a
      constexpr bool ends_with(const charT* s) const;                 // C++2a

     private:
      const_pointer data_;  // exposition only
      size_type     size_;  // exposition only
    };

  // 7.11, Hash support
  template <class T> struct hash;
  template <> struct hash<string_view>;
  template <> struct hash<u16string_view>;
  template <> struct hash<u32string_view>;
  template <> struct hash<wstring_view>;

  constexpr basic_string_view<char>     operator "" sv( const char *str,     size_t len ) noexcept;
  constexpr basic_string_view<wchar_t>  operator "" sv( const wchar_t *str,  size_t len ) noexcept;
  constexpr basic_string_view<char16_t> operator "" sv( const char16_t *str, size_t len ) noexcept;
  constexpr basic_string_view<char32_t> operator "" sv( const char32_t *str, size_t len ) noexcept;

}  // namespace std


*/

#include <__config>
#include <__string>
#include <algorithm>
#include <iterator>
#include <limits>
#include <stdexcept>
#include <__debug>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>


_LIBCPP_BEGIN_NAMESPACE_STD

template<class _CharT, class _Traits = char_traits<_CharT> >
class _LIBCPP_TEMPLATE_VIS basic_string_view {
public:
    // types
    typedef _Traits                                    traits_type;
    typedef _CharT                                     value_type;
    typedef _CharT*                                    pointer;
    typedef const _CharT*                              const_pointer;
    typedef _CharT&                                    reference;
    typedef const _CharT&                              const_reference;
    typedef const_pointer                              const_iterator; // See [string.view.iterators]
    typedef const_iterator                             iterator;
    typedef _VSTD::reverse_iterator<const_iterator>    const_reverse_iterator;
    typedef const_reverse_iterator                     reverse_iterator;
    typedef size_t                                     size_type;
    typedef ptrdiff_t                                  difference_type;
    static _LIBCPP_CONSTEXPR const size_type npos = -1; // size_type(-1);

    static_assert(is_pod<value_type>::value, "Character type of basic_string_view must be a POD");
    static_assert((is_same<_CharT, typename traits_type::char_type>::value),
                  "traits_type::char_type must be the same type as CharT");

    // [string.view.cons], construct/copy
    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    basic_string_view() _NOEXCEPT : __data (nullptr), __size(0) {}

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    basic_string_view(const basic_string_view&) _NOEXCEPT = default;

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    basic_string_view& operator=(const basic_string_view&) _NOEXCEPT = default;

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    basic_string_view(const _CharT* __s, size_type __len) _NOEXCEPT
        : __data(__s), __size(__len)
    {
// #if _LIBCPP_STD_VER > 11
//         _LIBCPP_ASSERT(__len == 0 || __s != nullptr, "string_view::string_view(_CharT *, size_t): received nullptr");
// #endif
    }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    basic_string_view(const _CharT* __s)
        : __data(__s), __size(_Traits::length(__s)) {}

    // [string.view.iterators], iterators
    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    const_iterator begin()  const _NOEXCEPT { return cbegin(); }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    const_iterator end()    const _NOEXCEPT { return cend(); }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    const_iterator cbegin() const _NOEXCEPT { return __data; }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    const_iterator cend()   const _NOEXCEPT { return __data + __size; }

    _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator rbegin()   const _NOEXCEPT { return const_reverse_iterator(cend()); }

    _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator rend()     const _NOEXCEPT { return const_reverse_iterator(cbegin()); }

    _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator crbegin()  const _NOEXCEPT { return const_reverse_iterator(cend()); }

    _LIBCPP_CONSTEXPR_AFTER_CXX14 _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator crend()    const _NOEXCEPT { return const_reverse_iterator(cbegin()); }

    // [string.view.capacity], capacity
    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    size_type size()     const _NOEXCEPT { return __size; }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    size_type length()   const _NOEXCEPT { return __size; }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    size_type max_size() const _NOEXCEPT { return numeric_limits<size_type>::max(); }

    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
    bool empty()         const _NOEXCEPT { return __size == 0; }

    // [string.view.access], element access
    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    const_reference operator[](size_type __pos) const _NOEXCEPT { return __data[__pos]; }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    const_reference at(size_type __pos) const
    {
        return __pos >= size()
            ? (__throw_out_of_range("string_view::at"), __data[0])
            : __data[__pos];
    }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    const_reference front() const
    {
        return _LIBCPP_ASSERT(!empty(), "string_view::front(): string is empty"), __data[0];
    }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    const_reference back() const
    {
        return _LIBCPP_ASSERT(!empty(), "string_view::back(): string is empty"), __data[__size-1];
    }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    const_pointer data() const _NOEXCEPT { return __data; }

    // [string.view.modifiers], modifiers:
    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    void remove_prefix(size_type __n) _NOEXCEPT
    {
        _LIBCPP_ASSERT(__n <= size(), "remove_prefix() can't remove more than size()");
        __data += __n;
        __size -= __n;
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    void remove_suffix(size_type __n) _NOEXCEPT
    {
        _LIBCPP_ASSERT(__n <= size(), "remove_suffix() can't remove more than size()");
        __size -= __n;
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    void swap(basic_string_view& __other) _NOEXCEPT
    {
        const value_type *__p = __data;
        __data = __other.__data;
        __other.__data = __p;

        size_type __sz = __size;
        __size = __other.__size;
        __other.__size = __sz;
    }

    _LIBCPP_INLINE_VISIBILITY
    size_type copy(_CharT* __s, size_type __n, size_type __pos = 0) const
    {
        if (__pos > size())
            __throw_out_of_range("string_view::copy");
        size_type __rlen = _VSTD::min(__n, size() - __pos);
        _Traits::copy(__s, data() + __pos, __rlen);
        return __rlen;
    }

    _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
    basic_string_view substr(size_type __pos = 0, size_type __n = npos) const
    {
        return __pos > size()
            ? (__throw_out_of_range("string_view::substr"), basic_string_view())
            : basic_string_view(data() + __pos, _VSTD::min(__n, size() - __pos));
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 int compare(basic_string_view __sv) const _NOEXCEPT
    {
        size_type __rlen = _VSTD::min( size(), __sv.size());
        int __retval = _Traits::compare(data(), __sv.data(), __rlen);
        if ( __retval == 0 ) // first __rlen chars matched
            __retval = size() == __sv.size() ? 0 : ( size() < __sv.size() ? -1 : 1 );
        return __retval;
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    int compare(size_type __pos1, size_type __n1, basic_string_view __sv) const
    {
        return substr(__pos1, __n1).compare(__sv);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    int compare(                       size_type __pos1, size_type __n1, 
                basic_string_view __sv, size_type __pos2, size_type __n2) const
    {
        return substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2));
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    int compare(const _CharT* __s) const _NOEXCEPT
    {
        return compare(basic_string_view(__s));
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    int compare(size_type __pos1, size_type __n1, const _CharT* __s) const
    {
        return substr(__pos1, __n1).compare(basic_string_view(__s));
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    int compare(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2) const
    {
        return substr(__pos1, __n1).compare(basic_string_view(__s, __n2));
    }

    // find
    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT
    {
        _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr");
        return __str_find<value_type, size_type, traits_type, npos>
            (data(), size(), __s.data(), __pos, __s.size());
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find(_CharT __c, size_type __pos = 0) const _NOEXCEPT
    {
        return __str_find<value_type, size_type, traits_type, npos>
            (data(), size(), __c, __pos);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find(const _CharT* __s, size_type __pos, size_type __n) const
    {
        _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find(): received nullptr");
        return __str_find<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, __n);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find(const _CharT* __s, size_type __pos = 0) const
    {
        _LIBCPP_ASSERT(__s != nullptr, "string_view::find(): received nullptr");
        return __str_find<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, traits_type::length(__s));
    }

    // rfind
    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type rfind(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT
    {
        _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr");
        return __str_rfind<value_type, size_type, traits_type, npos>
            (data(), size(), __s.data(), __pos, __s.size());
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type rfind(_CharT __c, size_type __pos = npos) const _NOEXCEPT
    {
        return __str_rfind<value_type, size_type, traits_type, npos>
            (data(), size(), __c, __pos);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type rfind(const _CharT* __s, size_type __pos, size_type __n) const
    {
        _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::rfind(): received nullptr");
        return __str_rfind<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, __n);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type rfind(const _CharT* __s, size_type __pos=npos) const
    {
        _LIBCPP_ASSERT(__s != nullptr, "string_view::rfind(): received nullptr");
        return __str_rfind<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, traits_type::length(__s));
    }

    // find_first_of
    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_first_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT
    {
        _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_of(): received nullptr");
        return __str_find_first_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s.data(), __pos, __s.size());
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_first_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT
    { return find(__c, __pos); }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
    {
        _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_of(): received nullptr");
        return __str_find_first_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, __n);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_first_of(const _CharT* __s, size_type __pos=0) const
    {
        _LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_of(): received nullptr");
        return __str_find_first_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, traits_type::length(__s));
    }

    // find_last_of
    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_last_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT
    {
        _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_of(): received nullptr");
        return __str_find_last_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s.data(), __pos, __s.size());
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_last_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT
    { return rfind(__c, __pos); }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
    {
        _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_of(): received nullptr");
        return __str_find_last_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, __n);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_last_of(const _CharT* __s, size_type __pos=npos) const
    {
        _LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_of(): received nullptr");
        return __str_find_last_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, traits_type::length(__s));
    }

    // find_first_not_of
    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_first_not_of(basic_string_view __s, size_type __pos=0) const _NOEXCEPT
    {
        _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_not_of(): received nullptr");
        return __str_find_first_not_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s.data(), __pos, __s.size());
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_first_not_of(_CharT __c, size_type __pos=0) const _NOEXCEPT
    {
        return __str_find_first_not_of<value_type, size_type, traits_type, npos>
            (data(), size(), __c, __pos);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
    {
        _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_not_of(): received nullptr");
        return __str_find_first_not_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, __n);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_first_not_of(const _CharT* __s, size_type __pos=0) const
    {
        _LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_not_of(): received nullptr");
        return __str_find_first_not_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, traits_type::length(__s));
    }

    // find_last_not_of
    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_last_not_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT
    {
        _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_not_of(): received nullptr");
        return __str_find_last_not_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s.data(), __pos, __s.size());
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_last_not_of(_CharT __c, size_type __pos=npos) const _NOEXCEPT
    {
        return __str_find_last_not_of<value_type, size_type, traits_type, npos>
            (data(), size(), __c, __pos);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
    {
        _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_not_of(): received nullptr");
        return __str_find_last_not_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, __n);
    }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    size_type find_last_not_of(const _CharT* __s, size_type __pos=npos) const
    {
        _LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_not_of(): received nullptr");
        return __str_find_last_not_of<value_type, size_type, traits_type, npos>
            (data(), size(), __s, __pos, traits_type::length(__s));
    }

#if _LIBCPP_STD_VER > 17
    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    bool starts_with(basic_string_view __s) const _NOEXCEPT
    { return size() >= __s.size() && compare(0, __s.size(), __s) == 0; }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    bool starts_with(value_type __c) const _NOEXCEPT
    { return !empty() && _Traits::eq(front(), __c); }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    bool starts_with(const value_type* __s) const _NOEXCEPT
    { return starts_with(basic_string_view(__s)); }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    bool ends_with(basic_string_view __s) const _NOEXCEPT
    { return size() >= __s.size() && compare(size() - __s.size(), npos, __s) == 0; }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    bool ends_with(value_type __c) const _NOEXCEPT
    { return !empty() && _Traits::eq(back(), __c); }

    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    bool ends_with(const value_type* __s) const _NOEXCEPT
    { return ends_with(basic_string_view(__s)); }
#endif

private:
    const   value_type* __data;
    size_type           __size;
};


// [string.view.comparison]
// operator ==
template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator==(basic_string_view<_CharT, _Traits> __lhs,
                basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    if ( __lhs.size() != __rhs.size()) return false;
    return __lhs.compare(__rhs) == 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator==(basic_string_view<_CharT, _Traits> __lhs,
                typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
{
    if ( __lhs.size() != __rhs.size()) return false;
    return __lhs.compare(__rhs) == 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator==(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
                basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    if ( __lhs.size() != __rhs.size()) return false;
    return __lhs.compare(__rhs) == 0;
}


// operator !=
template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator!=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    if ( __lhs.size() != __rhs.size())
        return true;
    return __lhs.compare(__rhs) != 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator!=(basic_string_view<_CharT, _Traits> __lhs,
                typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
{
    if ( __lhs.size() != __rhs.size())
        return true;
    return __lhs.compare(__rhs) != 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator!=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
                basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    if ( __lhs.size() != __rhs.size())
        return true;
    return __lhs.compare(__rhs) != 0;
}


// operator <
template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator<(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) < 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator<(basic_string_view<_CharT, _Traits> __lhs,
                typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) < 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator<(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
                basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) < 0;
}


// operator >
template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator> (basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) > 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator>(basic_string_view<_CharT, _Traits> __lhs,
                typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) > 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator>(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
                basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) > 0;
}


// operator <=
template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator<=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) <= 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator<=(basic_string_view<_CharT, _Traits> __lhs,
                typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) <= 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator<=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
                basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) <= 0;
}


// operator >=
template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator>=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) >= 0;
}


template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator>=(basic_string_view<_CharT, _Traits> __lhs,
                typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) >= 0;
}

template<class _CharT, class _Traits>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator>=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
                basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) >= 0;
}

typedef basic_string_view<char>     string_view;
typedef basic_string_view<char16_t> u16string_view;
typedef basic_string_view<char32_t> u32string_view;
typedef basic_string_view<wchar_t>  wstring_view;

// [string.view.hash]
template<class _CharT, class _Traits>
struct _LIBCPP_TEMPLATE_VIS hash<basic_string_view<_CharT, _Traits> >
    : public unary_function<basic_string_view<_CharT, _Traits>, size_t>
{
    size_t operator()(const basic_string_view<_CharT, _Traits> __val) const _NOEXCEPT;
};

template<class _CharT, class _Traits>
size_t
hash<basic_string_view<_CharT, _Traits> >::operator()(
        const basic_string_view<_CharT, _Traits> __val) const _NOEXCEPT
{
    return __do_string_hash(__val.data(), __val.data() + __val.size());
}


#if _LIBCPP_STD_VER > 11 
inline namespace literals
{
  inline namespace string_view_literals
  {
    inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
    basic_string_view<char> operator "" sv(const char *__str, size_t __len) _NOEXCEPT
    {
        return basic_string_view<char> (__str, __len);
    }

    inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
    basic_string_view<wchar_t> operator "" sv(const wchar_t *__str, size_t __len) _NOEXCEPT
    {
        return basic_string_view<wchar_t> (__str, __len);
    }

    inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
    basic_string_view<char16_t> operator "" sv(const char16_t *__str, size_t __len) _NOEXCEPT
    {
        return basic_string_view<char16_t> (__str, __len);
    }

    inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
    basic_string_view<char32_t> operator "" sv(const char32_t *__str, size_t __len) _NOEXCEPT
    {
        return basic_string_view<char32_t> (__str, __len);
    }
  }
}
#endif
_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP_STRING_VIEW