aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.9/libstdc++-v3/include/experimental/string_view
blob: bebeb6b62ea2f356fcf91d98d351694838703af7 (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
// Components for manipulating non-owning sequences of characters -*- C++ -*-

// Copyright (C) 2013-2014 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file experimental/string_view
 *  This is a Standard C++ Library header.
 */

//
// N3762 basic_string_view library
//

#ifndef _GLIBCXX_EXPERIMENTAL_STRING_VIEW
#define _GLIBCXX_EXPERIMENTAL_STRING_VIEW 1

#pragma GCC system_header

#if __cplusplus <= 201103L
# include <bits/c++14_warning.h>
#else

#include <debug/debug.h>
#include <string>
#include <limits>

namespace std _GLIBCXX_VISIBILITY(default)
{
namespace experimental
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /**
   *  @class basic_string_view <string_view>
   *  @brief  A non-owning reference to a string.
   *
   *  @ingroup strings
   *  @ingroup sequences
   *
   *  @tparam _CharT  Type of character
   *  @tparam _Traits  Traits for character type, defaults to
   *                   char_traits<_CharT>.
   *
   *  A basic_string_view looks like this:
   *
   *  @code
   *    _CharT*    _M_str
   *    size_t     _M_len
   *  @endcode
   *
   *  A basic_string_view represents an empty string with a static constexpr
   *  length one string:
   *
   *  @code
   *    static constexpr value_type _S_empty_str[1]{0};
   *  @endcode
   */
  template<typename _CharT, typename _Traits = char_traits<_CharT>>
    class basic_string_view
    {

    public:

      // types
      using traits_type = _Traits;
      using value_type = _CharT;
      using pointer = const _CharT*;
      using const_pointer = const _CharT*;
      using reference = const _CharT&;
      using const_reference = const _CharT&;
      using const_iterator = const _CharT*;
      using iterator = const_iterator;
      using const_reverse_iterator = std::reverse_iterator<const_iterator>;
      using reverse_iterator = const_reverse_iterator;
      using size_type = size_t;
      using difference_type = ptrdiff_t;
      static constexpr size_type npos = size_type(-1);

      // [string.view.cons], construct/copy

      constexpr
      basic_string_view() noexcept
      : _M_len{0}, _M_str{_S_empty_str}
      { }

      constexpr basic_string_view(const basic_string_view&) noexcept = default;

      template<typename _Allocator>
        basic_string_view(const basic_string<_CharT, _Traits,
			  _Allocator>& __str) noexcept
        : _M_len{__str.length()}, _M_str{__str.data()}
        { }

      constexpr basic_string_view(const _CharT* __str)
      : _M_len{__str == nullptr ? 0 : traits_type::length(__str)},
	_M_str{__str == nullptr ? _S_empty_str : __str}
      { }

      constexpr basic_string_view(const _CharT* __str, size_type __len)
      : _M_len{__str == nullptr ? 0 :__len},
        _M_str{__str == nullptr ? _S_empty_str : __str}
      { }

      basic_string_view&
      operator=(const basic_string_view&) noexcept = default;

      // [string.view.iterators], iterators

      constexpr const_iterator
      begin() const noexcept
      { return this->_M_str; }

      constexpr const_iterator
      end() const noexcept
      { return this->_M_str + this->_M_len; }

      constexpr const_iterator
      cbegin() const noexcept
      { return this->_M_str; }

      constexpr const_iterator
      cend() const noexcept
      { return this->_M_str + this->_M_len; }

      const_reverse_iterator
      rbegin() const noexcept
      { return std::reverse_iterator<const_iterator>(this->end()); }

      const_reverse_iterator
      rend() const noexcept
      { return std::reverse_iterator<const_iterator>(this->begin()); }

      const_reverse_iterator
      crbegin() const noexcept
      { return std::reverse_iterator<const_iterator>(this->end()); }

      const_reverse_iterator
      crend() const noexcept
      { return std::reverse_iterator<const_iterator>(this->begin()); }

      // [string.view.capacity], capacity

      constexpr size_type
      size() const noexcept
      { return this->_M_len; }

      constexpr size_type
      length() const noexcept
      { return _M_len; }

      constexpr size_type
      max_size() const noexcept
      { return ((npos - sizeof(size_type) - sizeof(void*))
		/ sizeof(value_type) / 4); }

      constexpr bool
      empty() const noexcept
      { return this->_M_len == 0; }

      // [string.view.access], element access

      constexpr const _CharT&
      operator[](size_type __pos) const
      {
	// TODO: Assert to restore in a way compatible with the constexpr.
	// _GLIBCXX_DEBUG_ASSERT(__pos < this->_M_len);
	return *(this->_M_str + __pos);
      }

      constexpr const _CharT&
      at(size_type __pos) const
      {
	return __pos < this->_M_len
	     ? *(this->_M_str + __pos)
	     : (__throw_out_of_range_fmt(__N("basic_string_view::at: __pos "
					     "(which is %zu) >= this->size() "
					     "(which is %zu)"),
					 __pos, this->size()),
		_S_empty_str[0]);
      }

      constexpr const _CharT&
      front() const
      {
	// TODO: Assert to restore in a way compatible with the constexpr.
	// _GLIBCXX_DEBUG_ASSERT(this->_M_len > 0);
	return *this->_M_str;
      }

      constexpr const _CharT&
      back() const
      {
	// TODO: Assert to restore in a way compatible with the constexpr.
	// _GLIBCXX_DEBUG_ASSERT(this->_M_len > 0);
	return *(this->_M_str + this->_M_len - 1);
      }

      constexpr const _CharT*
      data() const noexcept
      { return this->_M_str; }

      // [string.view.modifiers], modifiers:
      void
      clear() noexcept
      {
	this->_M_len = 0;
	this->_M_str = _S_empty_str;
      }

      void
      remove_prefix(size_type __n)
      {
	_GLIBCXX_DEBUG_ASSERT(this->_M_len >= __n);
	this->_M_str += __n;
	this->_M_len -= __n;
      }

      void
      remove_suffix(size_type __n)
      { this->_M_len -= __n; }

      void
      swap(basic_string_view& __sv) noexcept
      {
	std::swap(this->_M_len, __sv._M_len);
	std::swap(this->_M_str, __sv._M_str);
      }


      // [string.view.ops], string operations:

      template<typename _Allocator>
        explicit operator basic_string<_CharT, _Traits, _Allocator>() const
        {
	  return basic_string<_CharT, _Traits, _Allocator>
					(this->_M_len, this->_M_str);
	}

      size_type
      copy(_CharT* __str, size_type __n, size_type __pos = 0) const
      {
	__glibcxx_requires_string_len(__str, __n);
	if (__pos > this->_M_len)
	  __throw_out_of_range_fmt(__N("basic_string_view::copy: __pos "
				       "(which is %zu) > this->size() "
				       "(which is %zu)"),
				   __pos, this->size());
	size_type __rlen{std::min(__n, size_type{this->_M_len  - __pos})};
	for (auto __begin = this->_M_str + __pos,
	     __end = __begin + __rlen; __begin != __end;)
	  *__str++ = *__begin++;
	return __rlen;
      }


      // [string.view.ops], string operations:

      constexpr basic_string_view
      substr(size_type __pos, size_type __n=npos) const
      {
	return __pos <= this->_M_len
	     ? basic_string_view{this->_M_str + __pos,
				std::min(__n, size_type{this->_M_len  - __pos})}
	     : (__throw_out_of_range_fmt(__N("basic_string_view::substr: __pos "
					     "(which is %zu) > this->size() "
					     "(which is %zu)"),
				     __pos, this->size()), basic_string_view{});
      }

      int
      compare(basic_string_view __str) const noexcept
      {
	int __ret = traits_type::compare(this->_M_str, __str._M_str,
					 std::min(this->_M_len, __str._M_len));
	if (__ret == 0)
	  __ret = _S_compare(this->_M_len, __str._M_len);
	return __ret;
      }

      int
      compare(size_type __pos1, size_type __n1, basic_string_view __str) const
      { return this->substr(__pos1, __n1).compare(__str); }

      int
      compare(size_type __pos1, size_type __n1,
	      basic_string_view __str, size_type __pos2, size_type __n2) const
      { return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2)); }

      int
      compare(const _CharT* __str) const noexcept
      { return this->compare(basic_string_view{__str}); }

      int
      compare(size_type __pos1, size_type __n1, const _CharT* __str) const
      { return this->substr(__pos1, __n1).compare(basic_string_view{__str}); }

      int
      compare(size_type __pos1, size_type __n1,
	      const _CharT* __str, size_type __n2) const
      {
	return this->substr(__pos1, __n1)
		   .compare(basic_string_view(__str, __n2));
      }

      size_type
      find(basic_string_view __str, size_type __pos = 0) const noexcept
      { return this->find(__str._M_str, __pos, __str._M_len); }

      size_type
      find(_CharT __c, size_type __pos=0) const noexcept;

      size_type
      find(const _CharT* __str, size_type __pos, size_type __n) const;

      size_type
      find(const _CharT* __str, size_type __pos=0) const noexcept
      { return this->find(__str, __pos, traits_type::length(__str)); }

      size_type
      rfind(basic_string_view __str, size_type __pos = npos) const noexcept
      { return this->rfind(__str._M_str, __pos, __str._M_len); }

      size_type
      rfind(_CharT __c, size_type __pos = npos) const noexcept;

      size_type
      rfind(const _CharT* __str, size_type __pos, size_type __n) const;

      size_type
      rfind(const _CharT* __str, size_type __pos = npos) const noexcept
      { return this->rfind(__str, __pos, traits_type::length(__str)); }

      size_type
      find_first_of(basic_string_view __str, size_type __pos = 0) const noexcept
      { return this->find_first_of(__str._M_str, __pos, __str._M_len); }

      size_type
      find_first_of(_CharT __c, size_type __pos = 0) const noexcept
      { return this->find(__c, __pos); }

      size_type
      find_first_of(const _CharT* __str, size_type __pos, size_type __n) const;

      size_type
      find_first_of(const _CharT* __str, size_type __pos = 0) const noexcept
      { return this->find_first_of(__str, __pos, traits_type::length(__str)); }

      size_type
      find_last_of(basic_string_view __str,
		   size_type __pos = npos) const noexcept
      { return this->find_last_of(__str._M_str, __pos, __str._M_len); }

      size_type
      find_last_of(_CharT __c, size_type __pos=npos) const noexcept
      { return this->rfind(__c, __pos); }

      size_type
      find_last_of(const _CharT* __str, size_type __pos, size_type __n) const;

      size_type
      find_last_of(const _CharT* __str, size_type __pos = npos) const noexcept
      { return this->find_last_of(__str, __pos, traits_type::length(__str)); }

      size_type
      find_first_not_of(basic_string_view __str,
			size_type __pos = 0) const noexcept
      { return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }

      size_type
      find_first_not_of(_CharT __c, size_type __pos = 0) const noexcept;

      size_type
      find_first_not_of(const _CharT* __str,
			size_type __pos, size_type __n) const;

      size_type
      find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept
      {
	return this->find_first_not_of(__str, __pos,
				       traits_type::length(__str));
      }

      size_type
      find_last_not_of(basic_string_view __str,
		       size_type __pos = npos) const noexcept
      { return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }

      size_type
      find_last_not_of(_CharT __c, size_type __pos = npos) const noexcept;

      size_type
      find_last_not_of(const _CharT* __str,
		       size_type __pos, size_type __n) const;

      size_type
      find_last_not_of(const _CharT* __str,
		       size_type __pos = npos) const noexcept
      {
	return this->find_last_not_of(__str, __pos,
				      traits_type::length(__str));
      }

    private:

      static constexpr const int
      _S_compare(size_type __n1, size_type __n2) noexcept
      {
	return difference_type{__n1 - __n2} > std::numeric_limits<int>::max()
	     ? std::numeric_limits<int>::max()
	     : difference_type{__n1 - __n2} < std::numeric_limits<int>::min()
	     ? std::numeric_limits<int>::min()
	     : static_cast<int>(difference_type{__n1 - __n2});
      }

      static constexpr value_type _S_empty_str[1]{};

      size_t	    _M_len;
      const _CharT* _M_str;
    };


  // [string.view.comparison], non-member basic_string_view comparison functions

  namespace __detail
  {
    //  Identity transform to make ADL work with just one argument.
    //  See n3766.html.
    template<typename _Tp = void>
      struct __identity
      { typedef _Tp type; };

    template<>
      struct __identity<void>;

    template<typename _Tp>
      using __idt = typename __identity<_Tp>::type;
  }

  template<typename _CharT, typename _Traits>
    bool
    operator==(basic_string_view<_CharT, _Traits> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return __x.compare(__y) == 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator==(basic_string_view<_CharT, _Traits> __x,
               __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
    { return __x.compare(__y) == 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return __x.compare(__y) == 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator!=(basic_string_view<_CharT, _Traits> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return !(__x == __y); }

  template<typename _CharT, typename _Traits>
    bool
    operator!=(basic_string_view<_CharT, _Traits> __x,
               __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
    { return !(__x == __y); }

  template<typename _CharT, typename _Traits>
    bool
    operator!=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return !(__x == __y); }

  template<typename _CharT, typename _Traits>
    bool
    operator< (basic_string_view<_CharT, _Traits> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return __x.compare(__y) < 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator< (basic_string_view<_CharT, _Traits> __x,
               __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
    { return __x.compare(__y) < 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator< (__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return __x.compare(__y) < 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator> (basic_string_view<_CharT, _Traits> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return __x.compare(__y) > 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator> (basic_string_view<_CharT, _Traits> __x,
               __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
    { return __x.compare(__y) > 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator> (__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return __x.compare(__y) > 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator<=(basic_string_view<_CharT, _Traits> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return __x.compare(__y) <= 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator<=(basic_string_view<_CharT, _Traits> __x,
               __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
    { return __x.compare(__y) <= 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator<=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return __x.compare(__y) <= 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator>=(basic_string_view<_CharT, _Traits> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return __x.compare(__y) >= 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator>=(basic_string_view<_CharT, _Traits> __x,
               __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
    { return __x.compare(__y) >= 0; }

  template<typename _CharT, typename _Traits>
    bool
    operator>=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
               basic_string_view<_CharT, _Traits> __y) noexcept
    { return __x.compare(__y) >= 0; }

  // [string.view.comparison], sufficient additional overloads of comparison functions

  // [string.view.nonmem], other non-member basic_string_view functions
  template<typename _CharT, typename _Traits = char_traits<_CharT>,
           typename _Allocator = allocator<_CharT>>
    basic_string<_CharT, _Traits, _Allocator>
    to_string(basic_string_view<_CharT, _Traits> __str,
	      const _Allocator& __alloc = _Allocator())
    {
      return basic_string<_CharT, _Traits, _Allocator>
			(__str.begin(), __str.end(), __alloc);
    }

  template<typename _CharT, typename _Traits>
    basic_ostream<_CharT, _Traits>&
      operator<<(basic_ostream<_CharT, _Traits>& __os,
                 basic_string_view<_CharT,_Traits> __str)
      { return __ostream_insert(__os, __str.data(), __str.size()); }


  // basic_string_view typedef names

  using string_view = basic_string_view<char>;
#ifdef _GLIBCXX_USE_WCHAR_T
  using wstring_view = basic_string_view<wchar_t>;
#endif
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
  using u16string_view = basic_string_view<char16_t>;
  using u32string_view = basic_string_view<char32_t>;
#endif

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace experimental


  // [string.view.hash], hash support:

_GLIBCXX_BEGIN_NAMESPACE_VERSION
  template<typename _Tp>
    struct hash;

  template<>
    struct hash<experimental::string_view>
    : public __hash_base<size_t, experimental::string_view>
    {
      size_t
      operator()(const experimental::string_view& __str) const noexcept
      { return std::_Hash_impl::hash(__str.data(), __str.length()); }
    };

  template<>
    struct __is_fast_hash<hash<experimental::string_view>> : std::false_type
    { };

#ifdef _GLIBCXX_USE_WCHAR_T
  template<>
    struct hash<experimental::wstring_view>
    : public __hash_base<size_t, wstring>
    {
      size_t
      operator()(const experimental::wstring_view& __s) const noexcept
      { return std::_Hash_impl::hash(__s.data(),
                                     __s.length() * sizeof(wchar_t)); }
    };

  template<>
    struct __is_fast_hash<hash<experimental::wstring_view>> : std::false_type
    { };
#endif

#ifdef _GLIBCXX_USE_C99_STDINT_TR1
  template<>
    struct hash<experimental::u16string_view>
    : public __hash_base<size_t, experimental::u16string_view>
    {
      size_t
      operator()(const experimental::u16string_view& __s) const noexcept
      { return std::_Hash_impl::hash(__s.data(),
                                     __s.length() * sizeof(char16_t)); }
    };

  template<>
    struct __is_fast_hash<hash<experimental::u16string_view>> : std::false_type
    { };

  template<>
    struct hash<experimental::u32string_view>
    : public __hash_base<size_t, experimental::u32string_view>
    {
      size_t
      operator()(const experimental::u32string_view& __s) const noexcept
      { return std::_Hash_impl::hash(__s.data(),
                                     __s.length() * sizeof(char32_t)); }
    };

  template<>
    struct __is_fast_hash<hash<experimental::u32string_view>> : std::false_type
    { };
#endif
_GLIBCXX_END_NAMESPACE_VERSION

namespace experimental
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  // I added these EMSR.
  inline namespace literals
  {
  inline namespace string_view_literals
  {

    inline basic_string_view<char>
    operator""sv(const char* __str, size_t __len)
    { return basic_string_view<char>{__str, __len}; }

#ifdef _GLIBCXX_USE_WCHAR_T
    inline basic_string_view<wchar_t>
    operator""sv(const wchar_t* __str, size_t __len)
    { return basic_string_view<wchar_t>{__str, __len}; }
#endif

#ifdef _GLIBCXX_USE_C99_STDINT_TR1
    inline basic_string_view<char16_t>
    operator""sv(const char16_t* __str, size_t __len)
    { return basic_string_view<char16_t>{__str, __len}; }

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

  }
  }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace experimental
} // namespace std

#include <experimental/string_view.tcc>

#endif // __cplusplus <= 201103L

#endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW