source: mainline/uspace/lib/cpp/include/impl/istream.hpp@ a1c35cc

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since a1c35cc was a1c35cc, checked in by Dzejrou <dzejrou@…>, 7 years ago

cpp: added missing return statements, changed the way facets work for the moment (we return by value instead of by reference which means we can avoid that ugly leaking hack
  • Property mode set to 100644
File size: 29.0 KB
Line 
1/*
2 * Copyright (c) 2017 Jaroslav Jindrak
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef LIBCPP_ISTREAM
30#define LIBCPP_ISTREAM
31
32#include <ios>
33#include <iosfwd>
34#include <limits>
35#include <locale>
36#include <ostream>
37#include <utility>
38
39namespace std
40{
41
42 /**
43 * 27.7.2.1, class template basic_stream:
44 */
45
46 template<class Char, class Traits>
47 class basic_istream: virtual public basic_ios<Char, Traits>
48 {
49 public:
50 using traits_type = Traits;
51 using char_type = Char;
52 using int_type = typename traits_type::int_type;
53 using pos_type = typename traits_type::pos_type;
54 using off_type = typename traits_type::off_type;
55
56 /**
57 * 27.7.2.1.1, constructor/destructor:
58 */
59
60 explicit basic_istream(basic_streambuf<Char, Traits>* sb)
61 : gcount_{0}
62 {
63 basic_ios<Char, Traits>::init(sb);
64 }
65
66 virtual ~basic_istream()
67 { /* DUMMY BODY */ }
68
69 /**
70 * 27.7.2.1.3, prefix/suffix:
71 */
72
73 class sentry
74 {
75 public:
76 explicit sentry(basic_istream<Char, Traits>& is, bool noskipws = false)
77 : ok_{false}
78 {
79 if (!is.good())
80 is.setstate(ios_base::failbit);
81 else
82 {
83 if (is.tie())
84 is.tie()->flush();
85
86 if (!noskipws && ((is.flags() & ios_base::skipws) != 0))
87 {
88 const auto& ct = use_facet<ctype<Char>>(is.getloc());
89 while (true)
90 {
91 auto i = is.rdbuf()->sgetc();
92 if (Traits::eq_int_type(i, Traits::eof()))
93 {
94 is.setstate(ios_base::failbit | ios_base::eofbit);
95 break;
96 }
97
98 auto c = Traits::to_char_type(i);
99 if (!ct.is(ctype_base::space, c))
100 break;
101 else
102 is.rdbuf()->sbumpc();
103 }
104 }
105 }
106
107 if (is.good())
108 ok_ = true;
109 }
110
111 ~sentry() = default;
112
113 explicit operator bool() const
114 {
115 return ok_;
116 }
117
118 sentry(const sentry&) = delete;
119 sentry& operator=(const sentry&) = delete;
120
121 private:
122 using traits_type = Traits;
123 bool ok_;
124 };
125
126 /**
127 * 27.7.2.2, formatted input:
128 */
129
130 basic_istream<Char, Traits>& operator>>(
131 basic_istream<Char, Traits>& (*pf)(basic_istream<Char, Traits>&)
132 )
133 {
134 return pf(*this);
135 }
136
137 basic_istream<Char, Traits>& operator>>(
138 basic_ios<Char, Traits>& (*pf)(basic_ios<Char, Traits>&)
139 )
140 {
141 pf(*this);
142
143 return *this;
144 }
145
146 basic_istream<Char, Traits>& operator>>(
147 ios_base& (*pf)(ios_base&)
148 )
149 {
150 pf(*this);
151
152 return *this;
153 }
154
155 basic_istream<Char, Traits>& operator>>(bool& x)
156 {
157 sentry sen{*this, false};
158
159 if (sen)
160 {
161 using num_get = num_get<Char, istreambuf_iterator<Char, Traits>>;
162 auto err = ios_base::goodbit;
163
164 auto loc = this->getloc();
165 use_facet<num_get>(loc).get(*this, 0, *this, err, x);
166 this->setstate(err);
167 }
168
169 return *this;
170 }
171
172 basic_istream<Char, Traits>& operator>>(short& x)
173 {
174 sentry sen{*this, false};
175
176 if (sen)
177 {
178 using num_get = num_get<Char, istreambuf_iterator<Char, Traits>>;
179 auto err = ios_base::goodbit;
180
181 long tmp{};
182 auto loc = this->getloc();
183 use_facet<num_get>(loc).get(*this, 0, *this, err, tmp);
184
185 if (tmp < numeric_limits<short>::min())
186 {
187 err |= ios_base::failbit;
188 x = numeric_limits<short>::min();
189 }
190 else if (numeric_limits<short>::max() < tmp)
191 {
192 err |= ios_base::failbit;
193 x = numeric_limits<short>::max();
194 }
195 else
196 x = static_cast<short>(tmp);
197
198 this->setstate(err);
199 }
200
201 return *this;
202 }
203
204 basic_istream<Char, Traits>& operator>>(unsigned short& x)
205 {
206 sentry sen{*this, false};
207
208 if (sen)
209 {
210 using num_get = num_get<Char, istreambuf_iterator<Char, Traits>>;
211 auto err = ios_base::goodbit;
212
213 auto loc = this->getloc();
214 use_facet<num_get>(loc).get(*this, 0, *this, err, x);
215 this->setstate(err);
216 }
217
218 return *this;
219 }
220
221 basic_istream<Char, Traits>& operator>>(int& x)
222 {
223 sentry sen{*this, false};
224
225 if (sen)
226 {
227 using num_get = num_get<Char, istreambuf_iterator<Char, Traits>>;
228 auto err = ios_base::goodbit;
229
230 long tmp{};
231 auto loc = this->getloc();
232 use_facet<num_get>(loc).get(*this, 0, *this, err, tmp);
233
234 if (tmp < numeric_limits<int>::min())
235 {
236 err |= ios_base::failbit;
237 x = numeric_limits<int>::min();
238 }
239 else if (numeric_limits<int>::max() < tmp)
240 {
241 err |= ios_base::failbit;
242 x = numeric_limits<int>::max();
243 }
244 else
245 x = static_cast<int>(tmp);
246
247 this->setstate(err);
248 }
249
250 return *this;
251 }
252
253 basic_istream<Char, Traits>& operator>>(unsigned int& x)
254 {
255 sentry sen{*this, false};
256
257 if (sen)
258 {
259 using num_get = num_get<Char, istreambuf_iterator<Char, Traits>>;
260 auto err = ios_base::goodbit;
261
262 auto loc = this->getloc();
263 use_facet<num_get>(loc).get(*this, 0, *this, err, x);
264 this->setstate(err);
265 }
266
267 return *this;
268 }
269
270 basic_istream<Char, Traits>& operator>>(long& x)
271 {
272 sentry sen{*this, false};
273
274 if (sen)
275 {
276 using num_get = num_get<Char, istreambuf_iterator<Char, Traits>>;
277 auto err = ios_base::goodbit;
278
279 auto loc = this->getloc();
280 use_facet<num_get>(loc).get(*this, 0, *this, err, x);
281 this->setstate(err);
282 }
283
284 return *this;
285 }
286
287 basic_istream<Char, Traits>& operator>>(unsigned long& x)
288 {
289 sentry sen{*this, false};
290
291 if (sen)
292 {
293 using num_get = num_get<Char, istreambuf_iterator<Char, Traits>>;
294 auto err = ios_base::goodbit;
295
296 auto loc = this->getloc();
297 use_facet<num_get>(loc).get(*this, 0, *this, err, x);
298 this->setstate(err);
299 }
300
301 return *this;
302 }
303
304 basic_istream<Char, Traits>& operator>>(long long& x)
305 {
306 sentry sen{*this, false};
307
308 if (sen)
309 {
310 using num_get = num_get<Char, istreambuf_iterator<Char, Traits>>;
311 auto err = ios_base::goodbit;
312
313 auto loc = this->getloc();
314 use_facet<num_get>(loc).get(*this, 0, *this, err, x);
315 this->setstate(err);
316 }
317
318 return *this;
319 }
320
321 basic_istream<Char, Traits>& operator>>(unsigned long long& x)
322 {
323 sentry sen{*this, false};
324
325 if (sen)
326 {
327 using num_get = num_get<Char, istreambuf_iterator<Char, Traits>>;
328 auto err = ios_base::goodbit;
329
330 auto loc = this->getloc();
331 use_facet<num_get>(loc).get(*this, 0, *this, err, x);
332 this->setstate(err);
333 }
334
335 return *this;
336 }
337
338 basic_istream<Char, Traits>& operator>>(float& x)
339 {
340 // TODO: implement
341 }
342
343 basic_istream<Char, Traits>& operator>>(double& x)
344 {
345 // TODO: implement
346 }
347
348 basic_istream<Char, Traits>& operator>>(long double& x)
349 {
350 // TODO: implement
351 }
352
353 basic_istream<Char, Traits>& operator>>(void*& p)
354 {
355 // TODO: implement
356 }
357
358 basic_istream<Char, Traits>& operator>>(basic_streambuf<Char, Traits>* sb)
359 {
360 if (!sb)
361 {
362 this->setstate(ios_base::failbit);
363 return *this;
364 }
365
366 gcount_ = 0;
367 sentry sen{*this, false};
368
369 if (sen)
370 {
371 while (true)
372 {
373 auto ic = this->rdbuf()->sgetc();
374 if (traits_type::eq_int_type(ic, traits_type::eof()))
375 {
376 this->setstate(ios_base::eofbit);
377 break;
378 }
379
380 auto res = sb->sputc(traits_type::to_char_type(ic));
381 if (traits_type::eq_int_type(res, traits_type::eof()))
382 break;
383
384 ++gcount_;
385 this->rdbuf()->sbumpc();
386 }
387 }
388
389 return *this;
390 }
391
392 /**
393 * 27.7.2.3, unformatted input:
394 * TODO: Once we have exceptions, implement
395 * 27.7.2.3 paragraph 1.
396 */
397
398 streamsize gcount() const
399 {
400 return gcount_;
401 }
402
403 int_type get()
404 {
405 gcount_ = 0;
406 sentry sen{*this, true};
407
408 if (sen)
409 {
410 auto res = this->rdbuf()->sbumpc();
411 if (!traits_type::eq_int_type(res, traits_type::eof()))
412 {
413 gcount_ = 1;
414 return res;
415 }
416
417 this->setstate(ios_base::failbit | ios_base::eofbit);
418 }
419
420 return traits_type::eof();
421 }
422
423 basic_istream<Char, Traits>& get(char_type& c)
424 {
425 auto res = get();
426 if (res != traits_type::eof())
427 c = traits_type::to_char_type(res);
428
429 return *this;
430 }
431
432 basic_istream<Char, Traits>& get(char_type* s, streamsize n, char_type delim)
433 {
434 gcount_ = 0;
435 sentry sen{*this, true};
436
437 if (sen && n > 0)
438 {
439 while(gcount_ < n - 1)
440 {
441 auto c = this->rdbuf()->sbumpc();
442
443 if (traits_type::eq_int_type(c, traits_type::eof()))
444 {
445 this->setstate(ios_base::eofbit);
446 break;
447 }
448
449 s[gcount_++] = traits_type::to_char_type(c);
450
451 auto peek = traits_type::to_char_type(this->rdbuf()->sgetc());
452 if (traits_type::eq(peek, delim))
453 break;
454 }
455
456 if (gcount_ == 0)
457 this->setstate(ios_base::failbit);
458 s[n] = char_type{};
459 }
460
461 return *this;
462 }
463
464 basic_istream<Char, Traits>& get(char_type* s, streamsize n)
465 {
466 return get(s, n, this->widen('\n'));
467 }
468
469 basic_istream<Char, Traits>& get(basic_streambuf<Char, Traits>& sb)
470 {
471 get(sb, this->widen('\n'));
472 }
473
474 basic_istream<Char, Traits>& get(basic_streambuf<Char, Traits>& sb, char_type delim)
475 {
476 gcount_ = 0;
477 sentry sen{*this, true};
478
479 if (sen)
480 {
481 while (true)
482 {
483 auto i = this->rdbuf()->sgetc();
484 if (traits_type::eq_int_type(i, traits_type::eof()))
485 {
486 this->setstate(ios_base::eofbit);
487 break;
488 }
489
490 auto c = traits_type::to_char_type(i);
491 if (traits_type::eq(c, delim))
492 break;
493
494 auto insert_ret = sb.sputc(c);
495 if (traits_type::eq_int_type(insert_ret, traits_type::eof()))
496 break;
497
498 this->rdbuf()->sbumpc();
499 ++gcount_;
500 }
501
502 if (gcount_ == 0)
503 this->setstate(ios_base::failbit);
504 }
505
506 return *this;
507 }
508
509 basic_istream<Char, Traits>& getline(char_type* s, streamsize n)
510 {
511 return getline(s, n, this->widen('\n'));
512 }
513
514 basic_istream<Char, Traits>& getline(char_type* s, streamsize n, char_type delim)
515 {
516 gcount_ = 0;
517 sentry sen{*this, true};
518
519 if (sen)
520 {
521 while (true)
522 { // We have exactly specified order of checks, easier to do them in the body.
523 auto c = this->rdbuf()->sbumpc();
524
525 if (traits_type::eq_int_type(c, traits_type::eof()))
526 {
527 this->setstate(ios_base::eofbit);
528 break;
529 }
530
531 if (traits_type::eq_int_type(c, traits_type::to_int_type(delim)))
532 break;
533
534 if (n < 1 || gcount_ >= n - 1)
535 {
536 this->setstate(ios_base::failbit);
537 break;
538 }
539
540 s[gcount_++] = traits_type::to_char_type(c);
541 }
542
543 if (gcount_ == 0)
544 this->setstate(ios_base::failbit);
545 if (n > 0)
546 s[gcount_] = char_type{};
547 }
548
549 return *this;
550 }
551
552 basic_istream<Char, Traits>& ignore(streamsize n = 1, int_type delim = traits_type::eof())
553 {
554 sentry sen{*this, true};
555
556 if (sen)
557 {
558 streamsize i{};
559 while (n == numeric_limits<streamsize>::max() || i < n)
560 {
561 auto c = this->rdbuf()->sbumpc();
562
563 if (traits_type::eq_int_type(c, traits_type::eof()))
564 {
565 this->setstate(ios_base::eofbit);
566 break;
567 }
568
569 if (traits_type::eq_int_type(c, delim))
570 break;
571 }
572 }
573
574 return *this;
575 }
576
577 int_type peek()
578 {
579 sentry sen{*this, true};
580
581 if (!this->good())
582 return traits_type::eof();
583 else
584 return this->rdbuf()->sgetc();
585 }
586
587 basic_istream<Char, Traits>& read(char_type* s, streamsize n)
588 {
589 gcount_ = 0;
590 sentry sen{*this, true};
591
592 if (!this->good())
593 {
594 this->setstate(ios_base::failbit);
595 return *this;
596 }
597
598 while (gcount_ < n)
599 {
600 auto c = this->rdbuf()->sbumpc();
601 if (traits_type::eq_int_type(c, traits_type::eof()))
602 {
603 this->setstate(ios_base::failbit | ios_base::eofbit);
604 break;
605 }
606
607 s[gcount_++] = traits_type::to_char_type(c);
608 }
609
610 return *this;
611 }
612
613 streamsize readsome(char_type* s, streamsize n)
614 {
615 gcount_ = 0;
616 sentry sen{*this, true};
617
618 if (!this->good())
619 {
620 this->setstate(ios_base::failbit);
621 return streamsize{};
622 }
623
624 auto avail = this->rdbuf()->in_avail();
625 if (avail == -1)
626 {
627 this->setstate(ios_base::eofbit);
628 return streamsize{};
629 } else if (avail > 0)
630 {
631 auto count = (avail < n ? avail : n);
632 while (gcount_ < count)
633 s[gcount_++] = traits_type::to_char_type(this->rdbuf()->sbumpc());
634 }
635
636 return gcount_;
637 }
638
639 basic_istream<Char, Traits>& putback(char_type c)
640 {
641 this->clear(this->rdstate() & (~ios_base::eofbit));
642
643 gcount_ = 0;
644 sentry sen{*this, true};
645
646 if (!this->good())
647 {
648 this->setstate(ios_base::failbit);
649 return *this;
650 }
651
652 if (this->rdbuf())
653 {
654 auto ret = this->rdbuf()->sputbackc(c);
655 if (traits_type::eq_int_type(ret, traits_type::eof()))
656 this->setstate(ios_base::badbit);
657 }
658 else
659 this->setstate(ios_base::badbit);
660
661 return *this;
662 }
663
664 basic_istream<Char, Traits>& unget()
665 {
666 this->clear(this->rdstate() & (~ios_base::eofbit));
667
668 gcount_ = 0;
669 sentry sen{*this, true};
670
671 if (!this->good())
672 {
673 this->setstate(ios_base::failbit);
674 return *this;
675 }
676
677 if (this->rdbuf())
678 {
679 auto ret = this->rdbuf()->sungetc();
680 if (traits_type::eq_int_type(ret, traits_type::eof()))
681 this->setstate(ios_base::badbit);
682 }
683 else
684 this->setstate(ios_base::badbit);
685
686 return *this;
687 }
688
689 int sync()
690 {
691 sentry s{*this, true};
692
693 if (this->rdbuf())
694 {
695 auto ret = this->rdbuf()->pubsync();
696 if (ret == -1)
697 {
698 this->setstate(ios_base::badbit);
699 return -1;
700 }
701 else
702 return 0;
703 }
704 else
705 return -1;
706 }
707
708 pos_type tellg()
709 {
710 sentry s{*this, true};
711
712 if (this->fail())
713 return pos_type(-1);
714 else
715 return this->rdbuf()->pubseekoff(0, ios_base::cur, ios_base::in);
716 }
717
718 basic_istream<Char, Traits>& seekg(pos_type pos)
719 {
720 this->clear(this->rdstate() & (~ios_base::eofbit));
721
722 sentry sen{*this, true};
723
724 if (!this->fail())
725 this->rdbuf()->pubseekoff(pos, ios_base::in);
726 else
727 this->setstate(ios_base::failbit);
728
729 return *this;
730 }
731
732 basic_istream<Char, Traits>& seekg(off_type off, ios_base::seekdir dir)
733 {
734 sentry sen{*this, true};
735
736 if (!this->fail())
737 this->rdbuf()->pubseekoff(off, dir, ios_base::in);
738 else
739 this->setstate(ios_base::failbit);
740
741 return *this;
742 }
743
744 protected:
745 streamsize gcount_;
746
747 basic_istream(const basic_istream&) = delete;
748
749 basic_istream(basic_istream&& rhs)
750 {
751 gcount_ = rhs.gcout_;
752
753 basic_ios<Char, Traits>::move(rhs);
754
755 rhs.gcount_ = 0;
756 }
757
758 /**
759 * 27.7.2.1.2, assign/swap:
760 */
761
762 basic_istream& operator=(const basic_istream& rhs) = delete;
763
764 basic_istream& operator=(basic_istream&& rhs)
765 {
766 swap(rhs);
767
768 return *this;
769 }
770
771 void swap(basic_istream& rhs)
772 {
773 basic_ios<Char, Traits>::swap(rhs);
774 swap(gcount_, rhs.gcount_);
775 }
776 };
777
778 /**
779 * 27.7.2.2.3, character extraction templates:
780 */
781
782 template<class Char, class Traits>
783 basic_istream<Char, Traits>& operator>>(basic_istream<Char, Traits>& is,
784 Char& c)
785 {
786 typename basic_istream<Char, Traits>::sentry sen{is, false};
787
788 if (sen)
789 {
790 auto ic = is.rdbuf()->sgetc();
791 if (Traits::eq_int_type(ic, Traits::eof()))
792 {
793 is.setstate(ios_base::failbit | ios_base::eofbit);
794 return is;
795 }
796
797 c = Traits::to_char_type(is.rdbuf()->sbumpc());
798 }
799
800 return is;
801 }
802
803 template<class Char, class Traits>
804 basic_istream<Char, Traits>& operator>>(basic_istream<Char, Traits>& is,
805 unsigned char& c)
806 {
807 return is >> static_cast<char&>(c);
808 }
809
810 template<class Char, class Traits>
811 basic_istream<Char, Traits>& operator>>(basic_istream<Char, Traits>& is,
812 signed char& c)
813 {
814 return is >> static_cast<char&>(c);
815 }
816
817 template<class Char, class Traits>
818 basic_istream<Char, Traits>& operator>>(basic_istream<Char, Traits>& is,
819 Char* str)
820 {
821 typename basic_istream<Char, Traits>::sentry sen{is, false};
822
823 if (sen)
824 {
825 const auto& ct = use_facet<ctype<Char>>(is.getloc());
826
827 size_t n{};
828 if (is.width() > 0)
829 n = static_cast<size_t>(is.width());
830 else
831 n = (numeric_limits<size_t>::max() / sizeof(Char)) - sizeof(Char);
832
833 size_t i{};
834 for (; i < n - 1; ++i)
835 {
836 auto ic = is.rdbuf()->sgetc();
837 if (Traits::eq_int_type(ic, Traits::eof()))
838 break;
839
840 auto c = Traits::to_char_type(ic);
841 if (ct.is(ctype_base::space, c))
842 break;
843
844 str[i] = c;
845 is.rdbuf()->sbumpc();
846 }
847
848 str[i] = Char{};
849 if (i == 0)
850 is.setstate(ios_base::failbit);
851 }
852
853 return is;
854 }
855
856 template<class Char, class Traits>
857 basic_istream<Char, Traits>& operator>>(basic_istream<Char, Traits>& is,
858 unsigned char* str)
859 {
860 return is >> static_cast<char*>(str);
861 }
862
863 template<class Char, class Traits>
864 basic_istream<Char, Traits>& operator>>(basic_istream<Char, Traits>& is,
865 signed char* str)
866 {
867 return is >> static_cast<char*>(str);
868 }
869
870 /**
871 * 27.7.2.4, standard basic_istream manipulators:
872 */
873
874 template<class Char, class Traits = char_traits<Char>>
875 basic_istream<Char, Traits>& ws(basic_istream<Char, Traits>& is)
876 {
877 using sentry = typename basic_istream<Char, Traits>::sentry;
878 sentry sen{is, true};
879
880 if (sen)
881 {
882 const auto& ct = use_facet<ctype<Char>>(is.getloc());
883 while (true)
884 {
885 auto i = is.rdbuf()->sgetc();
886 if (Traits::eq_int_type(i, Traits::eof()))
887 {
888 is.setstate(ios_base::eofbit);
889 break;
890 }
891
892 auto c = Traits::to_char_type(i);
893 if (!ct.is(c, ct.space))
894 break;
895 else
896 is.rdbuf()->sbumpc();
897 }
898 }
899
900 return is;
901 }
902
903 using istream = basic_istream<char>;
904 using wistream = basic_istream<wchar_t>;
905
906 /**
907 * 27.7.2.5, class template basic_iostream:
908 */
909
910 template<class Char, class Traits>
911 class basic_iostream
912 : public basic_istream<Char, Traits>,
913 public basic_ostream<Char, Traits>
914 {
915 public:
916 using char_type = Char;
917 using traits_type = Traits;
918 using int_type = typename traits_type::int_type;
919 using pos_type = typename traits_type::pos_type;
920 using off_type = typename traits_type::off_type;
921
922 explicit basic_iostream(basic_streambuf<char_type, traits_type>* sb)
923 : basic_istream<char_type, traits_type>(sb),
924 basic_ostream<char_type, traits_type>(sb)
925 { /* DUMMY BODY */ }
926
927 virtual ~basic_iostream()
928 { /* DUMMY BODY */ }
929
930 protected:
931 basic_iostream(const basic_iostream&) = delete;
932 basic_iostream& operator=(const basic_iostream&) = delete;
933
934 basic_iostream(basic_iostream&& other)
935 : basic_istream<char_type, traits_type>(move(other))
936 { /* DUMMY BODY */ }
937
938 basic_iostream& operator=(basic_iostream&& other)
939 {
940 swap(other);
941 }
942
943 void swap(basic_iostream& other)
944 {
945 basic_istream<char_type, traits_type>::swap(other);
946 }
947 };
948
949 using iostream = basic_iostream<char>;
950 using wiostream = basic_iostream<wchar_t>;
951
952 /**
953 * 27.7.2.6, rvalue stream extraction:
954 */
955
956 template<class Char, class Traits, class T>
957 basic_istream<Char, Traits>& operator>>(basic_istream<Char, Traits>&& is, T& x)
958 {
959 is >> x;
960
961 return is;
962 }
963}
964
965#endif
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