xref: /freebsd/contrib/llvm-project/libcxx/include/istream (revision 66fd12cf4896eb08ad8e7a2627537f84ead84dd3)
1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_ISTREAM
11#define _LIBCPP_ISTREAM
12
13/*
14    istream synopsis
15
16template <class charT, class traits = char_traits<charT> >
17class basic_istream
18    : virtual public basic_ios<charT,traits>
19{
20public:
21    // types (inherited from basic_ios (27.5.4)):
22    typedef charT                          char_type;
23    typedef traits                         traits_type;
24    typedef typename traits_type::int_type int_type;
25    typedef typename traits_type::pos_type pos_type;
26    typedef typename traits_type::off_type off_type;
27
28    // 27.7.1.1.1 Constructor/destructor:
29    explicit basic_istream(basic_streambuf<char_type, traits_type>* sb);
30    basic_istream(basic_istream&& rhs);
31    virtual ~basic_istream();
32
33    // 27.7.1.1.2 Assign/swap:
34    basic_istream& operator=(basic_istream&& rhs);
35    void swap(basic_istream& rhs);
36
37    // 27.7.1.1.3 Prefix/suffix:
38    class sentry;
39
40    // 27.7.1.2 Formatted input:
41    basic_istream& operator>>(basic_istream& (*pf)(basic_istream&));
42    basic_istream& operator>>(basic_ios<char_type, traits_type>&
43                              (*pf)(basic_ios<char_type, traits_type>&));
44    basic_istream& operator>>(ios_base& (*pf)(ios_base&));
45    basic_istream& operator>>(basic_streambuf<char_type, traits_type>* sb);
46    basic_istream& operator>>(bool& n);
47    basic_istream& operator>>(short& n);
48    basic_istream& operator>>(unsigned short& n);
49    basic_istream& operator>>(int& n);
50    basic_istream& operator>>(unsigned int& n);
51    basic_istream& operator>>(long& n);
52    basic_istream& operator>>(unsigned long& n);
53    basic_istream& operator>>(long long& n);
54    basic_istream& operator>>(unsigned long long& n);
55    basic_istream& operator>>(float& f);
56    basic_istream& operator>>(double& f);
57    basic_istream& operator>>(long double& f);
58    basic_istream& operator>>(void*& p);
59
60    // 27.7.1.3 Unformatted input:
61    streamsize gcount() const;
62    int_type get();
63    basic_istream& get(char_type& c);
64    basic_istream& get(char_type* s, streamsize n);
65    basic_istream& get(char_type* s, streamsize n, char_type delim);
66    basic_istream& get(basic_streambuf<char_type,traits_type>& sb);
67    basic_istream& get(basic_streambuf<char_type,traits_type>& sb, char_type delim);
68
69    basic_istream& getline(char_type* s, streamsize n);
70    basic_istream& getline(char_type* s, streamsize n, char_type delim);
71
72    basic_istream& ignore(streamsize n = 1, int_type delim = traits_type::eof());
73    int_type peek();
74    basic_istream& read (char_type* s, streamsize n);
75    streamsize readsome(char_type* s, streamsize n);
76
77    basic_istream& putback(char_type c);
78    basic_istream& unget();
79    int sync();
80
81    pos_type tellg();
82    basic_istream& seekg(pos_type);
83    basic_istream& seekg(off_type, ios_base::seekdir);
84protected:
85    basic_istream(const basic_istream& rhs) = delete;
86    basic_istream(basic_istream&& rhs);
87    // 27.7.2.1.2 Assign/swap:
88    basic_istream& operator=(const basic_istream& rhs) = delete;
89    basic_istream& operator=(basic_istream&& rhs);
90    void swap(basic_istream& rhs);
91};
92
93// 27.7.1.2.3 character extraction templates:
94template<class charT, class traits>
95  basic_istream<charT,traits>& operator>>(basic_istream<charT,traits>&, charT&);
96
97template<class traits>
98  basic_istream<char,traits>& operator>>(basic_istream<char,traits>&, unsigned char&);
99
100template<class traits>
101  basic_istream<char,traits>& operator>>(basic_istream<char,traits>&, signed char&);
102
103template<class charT, class traits>
104  basic_istream<charT,traits>& operator>>(basic_istream<charT,traits>&, charT*);
105
106template<class traits>
107  basic_istream<char,traits>& operator>>(basic_istream<char,traits>&, unsigned char*);
108
109template<class traits>
110  basic_istream<char,traits>& operator>>(basic_istream<char,traits>&, signed char*);
111
112template <class charT, class traits>
113  void
114  swap(basic_istream<charT, traits>& x, basic_istream<charT, traits>& y);
115
116typedef basic_istream<char> istream;
117typedef basic_istream<wchar_t> wistream;
118
119template <class charT, class traits = char_traits<charT> >
120class basic_iostream :
121    public basic_istream<charT,traits>,
122    public basic_ostream<charT,traits>
123{
124public:
125    // types:
126    typedef charT                          char_type;
127    typedef traits                         traits_type;
128    typedef typename traits_type::int_type int_type;
129    typedef typename traits_type::pos_type pos_type;
130    typedef typename traits_type::off_type off_type;
131
132    // constructor/destructor
133    explicit basic_iostream(basic_streambuf<char_type, traits_type>* sb);
134    basic_iostream(basic_iostream&& rhs);
135    virtual ~basic_iostream();
136
137    // assign/swap
138    basic_iostream& operator=(basic_iostream&& rhs);
139    void swap(basic_iostream& rhs);
140};
141
142template <class charT, class traits>
143  void
144  swap(basic_iostream<charT, traits>& x, basic_iostream<charT, traits>& y);
145
146typedef basic_iostream<char> iostream;
147typedef basic_iostream<wchar_t> wiostream;
148
149template <class charT, class traits>
150  basic_istream<charT,traits>&
151  ws(basic_istream<charT,traits>& is);
152
153// rvalue stream extraction
154template <class Stream, class T>
155  Stream&& operator>>(Stream&& is, T&& x);
156
157}  // std
158
159*/
160
161#include <__assert> // all public C++ headers provide the assertion handler
162#include <__config>
163#include <__iterator/istreambuf_iterator.h>
164#include <__utility/forward.h>
165#include <ostream>
166#include <version>
167
168#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
169#  pragma GCC system_header
170#endif
171
172_LIBCPP_PUSH_MACROS
173#include <__undef_macros>
174
175
176_LIBCPP_BEGIN_NAMESPACE_STD
177
178template <class _CharT, class _Traits>
179class _LIBCPP_TEMPLATE_VIS basic_istream
180    : virtual public basic_ios<_CharT, _Traits>
181{
182    streamsize __gc_;
183public:
184    // types (inherited from basic_ios (27.5.4)):
185    typedef _CharT                         char_type;
186    typedef _Traits                        traits_type;
187    typedef typename traits_type::int_type int_type;
188    typedef typename traits_type::pos_type pos_type;
189    typedef typename traits_type::off_type off_type;
190
191    // 27.7.1.1.1 Constructor/destructor:
192    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
193    explicit basic_istream(basic_streambuf<char_type, traits_type>* __sb) : __gc_(0)
194    { this->init(__sb); }
195    ~basic_istream() override;
196protected:
197    inline _LIBCPP_INLINE_VISIBILITY
198    basic_istream(basic_istream&& __rhs);
199
200    // 27.7.1.1.2 Assign/swap:
201    inline _LIBCPP_INLINE_VISIBILITY
202    basic_istream& operator=(basic_istream&& __rhs);
203
204    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
205    void swap(basic_istream& __rhs) {
206      _VSTD::swap(__gc_, __rhs.__gc_);
207      basic_ios<char_type, traits_type>::swap(__rhs);
208    }
209
210    basic_istream           (const basic_istream& __rhs) = delete;
211    basic_istream& operator=(const basic_istream& __rhs) = delete;
212public:
213
214    // 27.7.1.1.3 Prefix/suffix:
215    class _LIBCPP_TEMPLATE_VIS sentry;
216
217    // 27.7.1.2 Formatted input:
218    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
219    basic_istream& operator>>(basic_istream& (*__pf)(basic_istream&))
220    { return __pf(*this); }
221
222    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
223    basic_istream& operator>>(basic_ios<char_type, traits_type>&
224                              (*__pf)(basic_ios<char_type, traits_type>&))
225    { __pf(*this); return *this; }
226
227    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
228    basic_istream& operator>>(ios_base& (*__pf)(ios_base&))
229    { __pf(*this); return *this; }
230
231    basic_istream& operator>>(basic_streambuf<char_type, traits_type>* __sb);
232    basic_istream& operator>>(bool& __n);
233    basic_istream& operator>>(short& __n);
234    basic_istream& operator>>(unsigned short& __n);
235    basic_istream& operator>>(int& __n);
236    basic_istream& operator>>(unsigned int& __n);
237    basic_istream& operator>>(long& __n);
238    basic_istream& operator>>(unsigned long& __n);
239    basic_istream& operator>>(long long& __n);
240    basic_istream& operator>>(unsigned long long& __n);
241    basic_istream& operator>>(float& __f);
242    basic_istream& operator>>(double& __f);
243    basic_istream& operator>>(long double& __f);
244    basic_istream& operator>>(void*& __p);
245
246    // 27.7.1.3 Unformatted input:
247    _LIBCPP_INLINE_VISIBILITY
248    streamsize gcount() const {return __gc_;}
249    int_type get();
250
251    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
252    basic_istream& get(char_type& __c) {
253      int_type __ch = get();
254      if (__ch != traits_type::eof())
255        __c = traits_type::to_char_type(__ch);
256      return *this;
257    }
258
259    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
260    basic_istream& get(char_type* __s, streamsize __n)
261    { return get(__s, __n, this->widen('\n')); }
262
263    basic_istream& get(char_type* __s, streamsize __n, char_type __dlm);
264
265    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
266    basic_istream& get(basic_streambuf<char_type, traits_type>& __sb)
267    { return get(__sb, this->widen('\n')); }
268
269    basic_istream& get(basic_streambuf<char_type, traits_type>& __sb, char_type __dlm);
270
271    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
272    basic_istream& getline(char_type* __s, streamsize __n)
273    { return getline(__s, __n, this->widen('\n')); }
274
275    basic_istream& getline(char_type* __s, streamsize __n, char_type __dlm);
276
277    basic_istream& ignore(streamsize __n = 1, int_type __dlm = traits_type::eof());
278    int_type peek();
279    basic_istream& read (char_type* __s, streamsize __n);
280    streamsize readsome(char_type* __s, streamsize __n);
281
282    basic_istream& putback(char_type __c);
283    basic_istream& unget();
284    int sync();
285
286    pos_type tellg();
287    basic_istream& seekg(pos_type __pos);
288    basic_istream& seekg(off_type __off, ios_base::seekdir __dir);
289};
290
291template <class _CharT, class _Traits>
292class _LIBCPP_TEMPLATE_VIS basic_istream<_CharT, _Traits>::sentry
293{
294    bool __ok_;
295
296public:
297    explicit sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws = false);
298//    ~sentry() = default;
299
300    _LIBCPP_INLINE_VISIBILITY
301    explicit operator bool() const {return __ok_;}
302
303    sentry(const sentry&) = delete;
304    sentry& operator=(const sentry&) = delete;
305};
306
307template <class _CharT, class _Traits>
308basic_istream<_CharT, _Traits>::sentry::sentry(basic_istream<_CharT, _Traits>& __is,
309                                               bool __noskipws)
310    : __ok_(false)
311{
312    if (__is.good())
313    {
314        if (__is.tie())
315            __is.tie()->flush();
316        if (!__noskipws && (__is.flags() & ios_base::skipws))
317        {
318            typedef istreambuf_iterator<_CharT, _Traits> _Ip;
319            const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
320            _Ip __i(__is);
321            _Ip __eof;
322            for (; __i != __eof; ++__i)
323                if (!__ct.is(__ct.space, *__i))
324                    break;
325            if (__i == __eof)
326                __is.setstate(ios_base::failbit | ios_base::eofbit);
327        }
328        __ok_ = __is.good();
329    }
330    else
331        __is.setstate(ios_base::failbit);
332}
333
334template <class _CharT, class _Traits>
335basic_istream<_CharT, _Traits>::basic_istream(basic_istream&& __rhs)
336    : __gc_(__rhs.__gc_)
337{
338    __rhs.__gc_ = 0;
339    this->move(__rhs);
340}
341
342template <class _CharT, class _Traits>
343basic_istream<_CharT, _Traits>&
344basic_istream<_CharT, _Traits>::operator=(basic_istream&& __rhs)
345{
346    swap(__rhs);
347    return *this;
348}
349
350template <class _CharT, class _Traits>
351basic_istream<_CharT, _Traits>::~basic_istream()
352{
353}
354
355template <class _Tp, class _CharT, class _Traits>
356_LIBCPP_INLINE_VISIBILITY
357basic_istream<_CharT, _Traits>&
358__input_arithmetic(basic_istream<_CharT, _Traits>& __is, _Tp& __n) {
359    ios_base::iostate __state = ios_base::goodbit;
360    typename basic_istream<_CharT, _Traits>::sentry __s(__is);
361    if (__s)
362    {
363#ifndef _LIBCPP_NO_EXCEPTIONS
364        try
365        {
366#endif // _LIBCPP_NO_EXCEPTIONS
367            typedef istreambuf_iterator<_CharT, _Traits> _Ip;
368            typedef num_get<_CharT, _Ip> _Fp;
369            std::use_facet<_Fp>(__is.getloc()).get(_Ip(__is), _Ip(), __is, __state, __n);
370#ifndef _LIBCPP_NO_EXCEPTIONS
371        }
372        catch (...)
373        {
374            __state |= ios_base::badbit;
375            __is.__setstate_nothrow(__state);
376            if (__is.exceptions() & ios_base::badbit)
377            {
378                throw;
379            }
380        }
381#endif
382        __is.setstate(__state);
383    }
384    return __is;
385}
386
387template <class _CharT, class _Traits>
388basic_istream<_CharT, _Traits>&
389basic_istream<_CharT, _Traits>::operator>>(unsigned short& __n)
390{
391    return _VSTD::__input_arithmetic<unsigned short>(*this, __n);
392}
393
394template <class _CharT, class _Traits>
395basic_istream<_CharT, _Traits>&
396basic_istream<_CharT, _Traits>::operator>>(unsigned int& __n)
397{
398    return _VSTD::__input_arithmetic<unsigned int>(*this, __n);
399}
400
401template <class _CharT, class _Traits>
402basic_istream<_CharT, _Traits>&
403basic_istream<_CharT, _Traits>::operator>>(long& __n)
404{
405    return _VSTD::__input_arithmetic<long>(*this, __n);
406}
407
408template <class _CharT, class _Traits>
409basic_istream<_CharT, _Traits>&
410basic_istream<_CharT, _Traits>::operator>>(unsigned long& __n)
411{
412    return _VSTD::__input_arithmetic<unsigned long>(*this, __n);
413}
414
415template <class _CharT, class _Traits>
416basic_istream<_CharT, _Traits>&
417basic_istream<_CharT, _Traits>::operator>>(long long& __n)
418{
419    return _VSTD::__input_arithmetic<long long>(*this, __n);
420}
421
422template <class _CharT, class _Traits>
423basic_istream<_CharT, _Traits>&
424basic_istream<_CharT, _Traits>::operator>>(unsigned long long& __n)
425{
426    return _VSTD::__input_arithmetic<unsigned long long>(*this, __n);
427}
428
429template <class _CharT, class _Traits>
430basic_istream<_CharT, _Traits>&
431basic_istream<_CharT, _Traits>::operator>>(float& __n)
432{
433    return _VSTD::__input_arithmetic<float>(*this, __n);
434}
435
436template <class _CharT, class _Traits>
437basic_istream<_CharT, _Traits>&
438basic_istream<_CharT, _Traits>::operator>>(double& __n)
439{
440    return _VSTD::__input_arithmetic<double>(*this, __n);
441}
442
443template <class _CharT, class _Traits>
444basic_istream<_CharT, _Traits>&
445basic_istream<_CharT, _Traits>::operator>>(long double& __n)
446{
447    return _VSTD::__input_arithmetic<long double>(*this, __n);
448}
449
450template <class _CharT, class _Traits>
451basic_istream<_CharT, _Traits>&
452basic_istream<_CharT, _Traits>::operator>>(bool& __n)
453{
454    return _VSTD::__input_arithmetic<bool>(*this, __n);
455}
456
457template <class _CharT, class _Traits>
458basic_istream<_CharT, _Traits>&
459basic_istream<_CharT, _Traits>::operator>>(void*& __n)
460{
461    return _VSTD::__input_arithmetic<void*>(*this, __n);
462}
463
464template <class _Tp, class _CharT, class _Traits>
465_LIBCPP_INLINE_VISIBILITY
466basic_istream<_CharT, _Traits>&
467__input_arithmetic_with_numeric_limits(basic_istream<_CharT, _Traits>& __is, _Tp& __n) {
468    ios_base::iostate __state = ios_base::goodbit;
469    typename basic_istream<_CharT, _Traits>::sentry __s(__is);
470    if (__s)
471    {
472#ifndef _LIBCPP_NO_EXCEPTIONS
473        try
474        {
475#endif // _LIBCPP_NO_EXCEPTIONS
476            typedef istreambuf_iterator<_CharT, _Traits> _Ip;
477            typedef num_get<_CharT, _Ip> _Fp;
478            long __temp;
479            std::use_facet<_Fp>(__is.getloc()).get(_Ip(__is), _Ip(), __is, __state, __temp);
480            if (__temp < numeric_limits<_Tp>::min())
481            {
482                __state |= ios_base::failbit;
483                __n = numeric_limits<_Tp>::min();
484            }
485            else if (__temp > numeric_limits<_Tp>::max())
486            {
487                __state |= ios_base::failbit;
488                __n = numeric_limits<_Tp>::max();
489            }
490            else
491            {
492                __n = static_cast<_Tp>(__temp);
493            }
494#ifndef _LIBCPP_NO_EXCEPTIONS
495        }
496        catch (...)
497        {
498            __state |= ios_base::badbit;
499            __is.__setstate_nothrow(__state);
500            if (__is.exceptions() & ios_base::badbit)
501            {
502                throw;
503            }
504        }
505#endif // _LIBCPP_NO_EXCEPTIONS
506        __is.setstate(__state);
507    }
508    return __is;
509}
510
511template <class _CharT, class _Traits>
512basic_istream<_CharT, _Traits>&
513basic_istream<_CharT, _Traits>::operator>>(short& __n)
514{
515    return _VSTD::__input_arithmetic_with_numeric_limits<short>(*this, __n);
516}
517
518template <class _CharT, class _Traits>
519basic_istream<_CharT, _Traits>&
520basic_istream<_CharT, _Traits>::operator>>(int& __n)
521{
522    return _VSTD::__input_arithmetic_with_numeric_limits<int>(*this, __n);
523}
524
525template<class _CharT, class _Traits>
526_LIBCPP_INLINE_VISIBILITY
527basic_istream<_CharT, _Traits>&
528__input_c_string(basic_istream<_CharT, _Traits>& __is, _CharT* __p, size_t __n)
529{
530    ios_base::iostate __state = ios_base::goodbit;
531    typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
532    if (__sen)
533    {
534#ifndef _LIBCPP_NO_EXCEPTIONS
535        try
536        {
537#endif
538            _CharT* __s = __p;
539            const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
540            while (__s != __p + (__n-1))
541            {
542                typename _Traits::int_type __i = __is.rdbuf()->sgetc();
543                if (_Traits::eq_int_type(__i, _Traits::eof()))
544                {
545                   __state |= ios_base::eofbit;
546                   break;
547                }
548                _CharT __ch = _Traits::to_char_type(__i);
549                if (__ct.is(__ct.space, __ch))
550                    break;
551                *__s++ = __ch;
552                 __is.rdbuf()->sbumpc();
553            }
554            *__s = _CharT();
555            __is.width(0);
556            if (__s == __p)
557               __state |= ios_base::failbit;
558#ifndef _LIBCPP_NO_EXCEPTIONS
559        }
560        catch (...)
561        {
562            __state |= ios_base::badbit;
563            __is.__setstate_nothrow(__state);
564            if (__is.exceptions() & ios_base::badbit)
565            {
566                throw;
567            }
568        }
569#endif
570        __is.setstate(__state);
571    }
572    return __is;
573}
574
575#if _LIBCPP_STD_VER > 17
576
577template<class _CharT, class _Traits, size_t _Np>
578inline _LIBCPP_INLINE_VISIBILITY
579basic_istream<_CharT, _Traits>&
580operator>>(basic_istream<_CharT, _Traits>& __is, _CharT (&__buf)[_Np])
581{
582    size_t __n = _Np;
583    if (__is.width() > 0)
584        __n = _VSTD::min(size_t(__is.width()), _Np);
585    return _VSTD::__input_c_string(__is, __buf, __n);
586}
587
588template<class _Traits, size_t _Np>
589inline _LIBCPP_INLINE_VISIBILITY
590basic_istream<char, _Traits>&
591operator>>(basic_istream<char, _Traits>& __is, unsigned char (&__buf)[_Np])
592{
593    return __is >> (char(&)[_Np])__buf;
594}
595
596template<class _Traits, size_t _Np>
597inline _LIBCPP_INLINE_VISIBILITY
598basic_istream<char, _Traits>&
599operator>>(basic_istream<char, _Traits>& __is, signed char (&__buf)[_Np])
600{
601    return __is >> (char(&)[_Np])__buf;
602}
603
604#else
605
606template<class _CharT, class _Traits>
607inline _LIBCPP_INLINE_VISIBILITY
608basic_istream<_CharT, _Traits>&
609operator>>(basic_istream<_CharT, _Traits>& __is, _CharT* __s)
610{
611    streamsize __n = __is.width();
612    if (__n <= 0)
613        __n = numeric_limits<streamsize>::max() / sizeof(_CharT) - 1;
614    return _VSTD::__input_c_string(__is, __s, size_t(__n));
615}
616
617template<class _Traits>
618inline _LIBCPP_INLINE_VISIBILITY
619basic_istream<char, _Traits>&
620operator>>(basic_istream<char, _Traits>& __is, unsigned char* __s)
621{
622    return __is >> (char*)__s;
623}
624
625template<class _Traits>
626inline _LIBCPP_INLINE_VISIBILITY
627basic_istream<char, _Traits>&
628operator>>(basic_istream<char, _Traits>& __is, signed char* __s)
629{
630    return __is >> (char*)__s;
631}
632
633#endif // _LIBCPP_STD_VER > 17
634
635template<class _CharT, class _Traits>
636_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
637operator>>(basic_istream<_CharT, _Traits>& __is, _CharT& __c)
638{
639    ios_base::iostate __state = ios_base::goodbit;
640    typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
641    if (__sen)
642    {
643#ifndef _LIBCPP_NO_EXCEPTIONS
644        try
645        {
646#endif
647            typename _Traits::int_type __i = __is.rdbuf()->sbumpc();
648            if (_Traits::eq_int_type(__i, _Traits::eof()))
649                __state |= ios_base::eofbit | ios_base::failbit;
650            else
651                __c = _Traits::to_char_type(__i);
652#ifndef _LIBCPP_NO_EXCEPTIONS
653        }
654        catch (...)
655        {
656            __state |= ios_base::badbit;
657            __is.__setstate_nothrow(__state);
658            if (__is.exceptions() & ios_base::badbit)
659            {
660                throw;
661            }
662        }
663#endif
664        __is.setstate(__state);
665    }
666    return __is;
667}
668
669template<class _Traits>
670inline _LIBCPP_INLINE_VISIBILITY
671basic_istream<char, _Traits>&
672operator>>(basic_istream<char, _Traits>& __is, unsigned char& __c)
673{
674    return __is >> (char&)__c;
675}
676
677template<class _Traits>
678inline _LIBCPP_INLINE_VISIBILITY
679basic_istream<char, _Traits>&
680operator>>(basic_istream<char, _Traits>& __is, signed char& __c)
681{
682    return __is >> (char&)__c;
683}
684
685template<class _CharT, class _Traits>
686basic_istream<_CharT, _Traits>&
687basic_istream<_CharT, _Traits>::operator>>(basic_streambuf<char_type, traits_type>* __sb)
688{
689    ios_base::iostate __state = ios_base::goodbit;
690    __gc_ = 0;
691    sentry __s(*this, true);
692    if (__s)
693    {
694        if (__sb)
695        {
696#ifndef _LIBCPP_NO_EXCEPTIONS
697            try
698            {
699#endif // _LIBCPP_NO_EXCEPTIONS
700                while (true)
701                {
702                    typename traits_type::int_type __i = this->rdbuf()->sgetc();
703                    if (traits_type::eq_int_type(__i, _Traits::eof()))
704                    {
705                       __state |= ios_base::eofbit;
706                       break;
707                    }
708                    if (traits_type::eq_int_type(
709                            __sb->sputc(traits_type::to_char_type(__i)),
710                            traits_type::eof()))
711                        break;
712                    ++__gc_;
713                    this->rdbuf()->sbumpc();
714                }
715                if (__gc_ == 0)
716                   __state |= ios_base::failbit;
717#ifndef _LIBCPP_NO_EXCEPTIONS
718            }
719            catch (...)
720            {
721                __state |= ios_base::badbit;
722                if (__gc_ == 0)
723                    __state |= ios_base::failbit;
724
725                this->__setstate_nothrow(__state);
726                if (this->exceptions() & ios_base::failbit || this->exceptions() & ios_base::badbit)
727                {
728                    throw;
729                }
730            }
731#endif // _LIBCPP_NO_EXCEPTIONS
732        }
733        else
734        {
735            __state |= ios_base::failbit;
736        }
737        this->setstate(__state);
738    }
739    return *this;
740}
741
742template<class _CharT, class _Traits>
743typename basic_istream<_CharT, _Traits>::int_type
744basic_istream<_CharT, _Traits>::get()
745{
746    ios_base::iostate __state = ios_base::goodbit;
747    __gc_ = 0;
748    int_type __r = traits_type::eof();
749    sentry __s(*this, true);
750    if (__s)
751    {
752#ifndef _LIBCPP_NO_EXCEPTIONS
753        try
754        {
755#endif
756            __r = this->rdbuf()->sbumpc();
757            if (traits_type::eq_int_type(__r, traits_type::eof()))
758               __state |= ios_base::failbit | ios_base::eofbit;
759            else
760                __gc_ = 1;
761#ifndef _LIBCPP_NO_EXCEPTIONS
762        }
763        catch (...)
764        {
765            this->__setstate_nothrow(this->rdstate() | ios_base::badbit);
766            if (this->exceptions() & ios_base::badbit)
767            {
768                throw;
769            }
770        }
771#endif
772        this->setstate(__state);
773    }
774    return __r;
775}
776
777template<class _CharT, class _Traits>
778basic_istream<_CharT, _Traits>&
779basic_istream<_CharT, _Traits>::get(char_type* __s, streamsize __n, char_type __dlm)
780{
781    ios_base::iostate __state = ios_base::goodbit;
782    __gc_ = 0;
783    sentry __sen(*this, true);
784    if (__sen)
785    {
786        if (__n > 0)
787        {
788#ifndef _LIBCPP_NO_EXCEPTIONS
789            try
790            {
791#endif
792                while (__gc_ < __n-1)
793                {
794                    int_type __i = this->rdbuf()->sgetc();
795                    if (traits_type::eq_int_type(__i, traits_type::eof()))
796                    {
797                       __state |= ios_base::eofbit;
798                       break;
799                    }
800                    char_type __ch = traits_type::to_char_type(__i);
801                    if (traits_type::eq(__ch, __dlm))
802                        break;
803                    *__s++ = __ch;
804                    ++__gc_;
805                     this->rdbuf()->sbumpc();
806                }
807                if (__gc_ == 0)
808                   __state |= ios_base::failbit;
809#ifndef _LIBCPP_NO_EXCEPTIONS
810            }
811            catch (...)
812            {
813                __state |= ios_base::badbit;
814                this->__setstate_nothrow(__state);
815                if (this->exceptions() & ios_base::badbit)
816                {
817                    if (__n > 0)
818                        *__s = char_type();
819                    throw;
820                }
821            }
822#endif
823        }
824        else
825        {
826            __state |= ios_base::failbit;
827        }
828
829        if (__n > 0)
830            *__s = char_type();
831        this->setstate(__state);
832    }
833    if (__n > 0)
834        *__s = char_type();
835    return *this;
836}
837
838template<class _CharT, class _Traits>
839basic_istream<_CharT, _Traits>&
840basic_istream<_CharT, _Traits>::get(basic_streambuf<char_type, traits_type>& __sb,
841                                    char_type __dlm)
842{
843    ios_base::iostate __state = ios_base::goodbit;
844    __gc_ = 0;
845    sentry __sen(*this, true);
846    if (__sen)
847    {
848#ifndef _LIBCPP_NO_EXCEPTIONS
849        try
850        {
851#endif // _LIBCPP_NO_EXCEPTIONS
852            while (true)
853            {
854                typename traits_type::int_type __i = this->rdbuf()->sgetc();
855                if (traits_type::eq_int_type(__i, traits_type::eof()))
856                {
857                   __state |= ios_base::eofbit;
858                   break;
859                }
860                char_type __ch = traits_type::to_char_type(__i);
861                if (traits_type::eq(__ch, __dlm))
862                    break;
863                if (traits_type::eq_int_type(__sb.sputc(__ch), traits_type::eof()))
864                    break;
865                ++__gc_;
866                this->rdbuf()->sbumpc();
867            }
868#ifndef _LIBCPP_NO_EXCEPTIONS
869        }
870        catch (...)
871        {
872            __state |= ios_base::badbit;
873            // according to the spec, exceptions here are caught but not rethrown
874        }
875#endif // _LIBCPP_NO_EXCEPTIONS
876        if (__gc_ == 0)
877           __state |= ios_base::failbit;
878        this->setstate(__state);
879    }
880    return *this;
881}
882
883template<class _CharT, class _Traits>
884basic_istream<_CharT, _Traits>&
885basic_istream<_CharT, _Traits>::getline(char_type* __s, streamsize __n, char_type __dlm)
886{
887    ios_base::iostate __state = ios_base::goodbit;
888    __gc_ = 0;
889    sentry __sen(*this, true);
890    if (__sen)
891    {
892#ifndef _LIBCPP_NO_EXCEPTIONS
893        try
894        {
895#endif // _LIBCPP_NO_EXCEPTIONS
896            while (true)
897            {
898                typename traits_type::int_type __i = this->rdbuf()->sgetc();
899                if (traits_type::eq_int_type(__i, traits_type::eof()))
900                {
901                   __state |= ios_base::eofbit;
902                   break;
903                }
904                char_type __ch = traits_type::to_char_type(__i);
905                if (traits_type::eq(__ch, __dlm))
906                {
907                    this->rdbuf()->sbumpc();
908                    ++__gc_;
909                    break;
910                }
911                if (__gc_ >= __n-1)
912                {
913                    __state |= ios_base::failbit;
914                    break;
915                }
916                *__s++ = __ch;
917                this->rdbuf()->sbumpc();
918                ++__gc_;
919            }
920#ifndef _LIBCPP_NO_EXCEPTIONS
921        }
922        catch (...)
923        {
924            __state |= ios_base::badbit;
925            this->__setstate_nothrow(__state);
926            if (this->exceptions() & ios_base::badbit)
927            {
928                if (__n > 0)
929                    *__s = char_type();
930                if (__gc_ == 0)
931                    __state |= ios_base::failbit;
932                throw;
933            }
934        }
935#endif // _LIBCPP_NO_EXCEPTIONS
936    }
937    if (__n > 0)
938        *__s = char_type();
939    if (__gc_ == 0)
940        __state |= ios_base::failbit;
941    this->setstate(__state);
942    return *this;
943}
944
945template<class _CharT, class _Traits>
946basic_istream<_CharT, _Traits>&
947basic_istream<_CharT, _Traits>::ignore(streamsize __n, int_type __dlm)
948{
949    ios_base::iostate __state = ios_base::goodbit;
950    __gc_ = 0;
951    sentry __sen(*this, true);
952    if (__sen)
953    {
954#ifndef _LIBCPP_NO_EXCEPTIONS
955        try
956        {
957#endif // _LIBCPP_NO_EXCEPTIONS
958            if (__n == numeric_limits<streamsize>::max())
959            {
960                while (true)
961                {
962                    typename traits_type::int_type __i = this->rdbuf()->sbumpc();
963                    if (traits_type::eq_int_type(__i, traits_type::eof()))
964                    {
965                       __state |= ios_base::eofbit;
966                       break;
967                    }
968                    ++__gc_;
969                    if (traits_type::eq_int_type(__i, __dlm))
970                        break;
971                }
972            }
973            else
974            {
975                while (__gc_ < __n)
976                {
977                    typename traits_type::int_type __i = this->rdbuf()->sbumpc();
978                    if (traits_type::eq_int_type(__i, traits_type::eof()))
979                    {
980                       __state |= ios_base::eofbit;
981                       break;
982                    }
983                    ++__gc_;
984                    if (traits_type::eq_int_type(__i, __dlm))
985                        break;
986                }
987            }
988#ifndef _LIBCPP_NO_EXCEPTIONS
989        }
990        catch (...)
991        {
992            __state |= ios_base::badbit;
993            this->__setstate_nothrow(__state);
994            if (this->exceptions() & ios_base::badbit)
995            {
996                throw;
997            }
998        }
999#endif // _LIBCPP_NO_EXCEPTIONS
1000        this->setstate(__state);
1001    }
1002    return *this;
1003}
1004
1005template<class _CharT, class _Traits>
1006typename basic_istream<_CharT, _Traits>::int_type
1007basic_istream<_CharT, _Traits>::peek()
1008{
1009    ios_base::iostate __state = ios_base::goodbit;
1010    __gc_ = 0;
1011    int_type __r = traits_type::eof();
1012    sentry __sen(*this, true);
1013    if (__sen)
1014    {
1015#ifndef _LIBCPP_NO_EXCEPTIONS
1016        try
1017        {
1018#endif // _LIBCPP_NO_EXCEPTIONS
1019            __r = this->rdbuf()->sgetc();
1020            if (traits_type::eq_int_type(__r, traits_type::eof()))
1021                __state |= ios_base::eofbit;
1022#ifndef _LIBCPP_NO_EXCEPTIONS
1023        }
1024        catch (...)
1025        {
1026            __state |= ios_base::badbit;
1027            this->__setstate_nothrow(__state);
1028            if (this->exceptions() & ios_base::badbit)
1029            {
1030                throw;
1031            }
1032        }
1033#endif // _LIBCPP_NO_EXCEPTIONS
1034        this->setstate(__state);
1035    }
1036    return __r;
1037}
1038
1039template<class _CharT, class _Traits>
1040basic_istream<_CharT, _Traits>&
1041basic_istream<_CharT, _Traits>::read(char_type* __s, streamsize __n)
1042{
1043    ios_base::iostate __state = ios_base::goodbit;
1044    __gc_ = 0;
1045    sentry __sen(*this, true);
1046    if (__sen)
1047    {
1048#ifndef _LIBCPP_NO_EXCEPTIONS
1049        try
1050        {
1051#endif // _LIBCPP_NO_EXCEPTIONS
1052            __gc_ = this->rdbuf()->sgetn(__s, __n);
1053            if (__gc_ != __n)
1054                __state |= ios_base::failbit | ios_base::eofbit;
1055#ifndef _LIBCPP_NO_EXCEPTIONS
1056        }
1057        catch (...)
1058        {
1059            __state |= ios_base::badbit;
1060            this->__setstate_nothrow(__state);
1061            if (this->exceptions() & ios_base::badbit)
1062            {
1063                throw;
1064            }
1065        }
1066#endif // _LIBCPP_NO_EXCEPTIONS
1067    }
1068    else
1069    {
1070        __state |= ios_base::failbit;
1071    }
1072    this->setstate(__state);
1073    return *this;
1074}
1075
1076template<class _CharT, class _Traits>
1077streamsize
1078basic_istream<_CharT, _Traits>::readsome(char_type* __s, streamsize __n)
1079{
1080    ios_base::iostate __state = ios_base::goodbit;
1081    __gc_ = 0;
1082    sentry __sen(*this, true);
1083    if (__sen)
1084    {
1085#ifndef _LIBCPP_NO_EXCEPTIONS
1086        try
1087        {
1088#endif // _LIBCPP_NO_EXCEPTIONS
1089            streamsize __c = this->rdbuf()->in_avail();
1090            switch (__c)
1091            {
1092            case -1:
1093                __state |= ios_base::eofbit;
1094                break;
1095            case 0:
1096                break;
1097            default:
1098                __n = _VSTD::min(__c, __n);
1099                __gc_ = this->rdbuf()->sgetn(__s, __n);
1100                if (__gc_ != __n)
1101                    __state |= ios_base::failbit | ios_base::eofbit;
1102                break;
1103            }
1104#ifndef _LIBCPP_NO_EXCEPTIONS
1105        }
1106        catch (...)
1107        {
1108            __state |= ios_base::badbit;
1109            this->__setstate_nothrow(__state);
1110            if (this->exceptions() & ios_base::badbit)
1111            {
1112                throw;
1113            }
1114        }
1115#endif // _LIBCPP_NO_EXCEPTIONS
1116    }
1117    else
1118    {
1119        __state |= ios_base::failbit;
1120    }
1121    this->setstate(__state);
1122    return __gc_;
1123}
1124
1125template<class _CharT, class _Traits>
1126basic_istream<_CharT, _Traits>&
1127basic_istream<_CharT, _Traits>::putback(char_type __c)
1128{
1129    ios_base::iostate __state = this->rdstate() & ~ios_base::eofbit;
1130    __gc_ = 0;
1131    this->clear(__state);
1132    sentry __sen(*this, true);
1133    if (__sen)
1134    {
1135#ifndef _LIBCPP_NO_EXCEPTIONS
1136        try
1137        {
1138#endif // _LIBCPP_NO_EXCEPTIONS
1139            if (this->rdbuf() == nullptr || this->rdbuf()->sputbackc(__c) == traits_type::eof())
1140                __state |= ios_base::badbit;
1141#ifndef _LIBCPP_NO_EXCEPTIONS
1142        }
1143        catch (...)
1144        {
1145            __state |= ios_base::badbit;
1146            this->__setstate_nothrow(__state);
1147            if (this->exceptions() & ios_base::badbit)
1148            {
1149                throw;
1150            }
1151        }
1152#endif // _LIBCPP_NO_EXCEPTIONS
1153    }
1154    else
1155    {
1156        __state |= ios_base::failbit;
1157    }
1158    this->setstate(__state);
1159    return *this;
1160}
1161
1162template<class _CharT, class _Traits>
1163basic_istream<_CharT, _Traits>&
1164basic_istream<_CharT, _Traits>::unget()
1165{
1166    ios_base::iostate __state = this->rdstate() & ~ios_base::eofbit;
1167    __gc_ = 0;
1168    this->clear(__state);
1169    sentry __sen(*this, true);
1170    if (__sen)
1171    {
1172#ifndef _LIBCPP_NO_EXCEPTIONS
1173        try
1174        {
1175#endif // _LIBCPP_NO_EXCEPTIONS
1176            if (this->rdbuf() == nullptr || this->rdbuf()->sungetc() == traits_type::eof())
1177                __state |= ios_base::badbit;
1178#ifndef _LIBCPP_NO_EXCEPTIONS
1179        }
1180        catch (...)
1181        {
1182            __state |= ios_base::badbit;
1183            this->__setstate_nothrow(__state);
1184            if (this->exceptions() & ios_base::badbit)
1185            {
1186                throw;
1187            }
1188        }
1189#endif // _LIBCPP_NO_EXCEPTIONS
1190    }
1191    else
1192    {
1193        __state |= ios_base::failbit;
1194    }
1195    this->setstate(__state);
1196    return *this;
1197}
1198
1199template<class _CharT, class _Traits>
1200int
1201basic_istream<_CharT, _Traits>::sync()
1202{
1203    ios_base::iostate __state = ios_base::goodbit;
1204    int __r = 0;
1205    sentry __sen(*this, true);
1206    if (__sen)
1207    {
1208#ifndef _LIBCPP_NO_EXCEPTIONS
1209        try
1210        {
1211#endif // _LIBCPP_NO_EXCEPTIONS
1212            if (this->rdbuf() == nullptr)
1213                return -1;
1214            if (this->rdbuf()->pubsync() == -1)
1215            {
1216                __state |= ios_base::badbit;
1217                return -1;
1218            }
1219#ifndef _LIBCPP_NO_EXCEPTIONS
1220        }
1221        catch (...)
1222        {
1223            __state |= ios_base::badbit;
1224            this->__setstate_nothrow(__state);
1225            if (this->exceptions() & ios_base::badbit)
1226            {
1227                throw;
1228            }
1229        }
1230#endif // _LIBCPP_NO_EXCEPTIONS
1231        this->setstate(__state);
1232    }
1233    return __r;
1234}
1235
1236template<class _CharT, class _Traits>
1237typename basic_istream<_CharT, _Traits>::pos_type
1238basic_istream<_CharT, _Traits>::tellg()
1239{
1240    ios_base::iostate __state = ios_base::goodbit;
1241    pos_type __r(-1);
1242    sentry __sen(*this, true);
1243    if (__sen)
1244    {
1245#ifndef _LIBCPP_NO_EXCEPTIONS
1246        try
1247        {
1248#endif // _LIBCPP_NO_EXCEPTIONS
1249        __r = this->rdbuf()->pubseekoff(0, ios_base::cur, ios_base::in);
1250#ifndef _LIBCPP_NO_EXCEPTIONS
1251        }
1252        catch (...)
1253        {
1254            __state |= ios_base::badbit;
1255            this->__setstate_nothrow(__state);
1256            if (this->exceptions() & ios_base::badbit)
1257            {
1258                throw;
1259            }
1260        }
1261#endif // _LIBCPP_NO_EXCEPTIONS
1262        this->setstate(__state);
1263    }
1264    return __r;
1265}
1266
1267template<class _CharT, class _Traits>
1268basic_istream<_CharT, _Traits>&
1269basic_istream<_CharT, _Traits>::seekg(pos_type __pos)
1270{
1271    ios_base::iostate __state = this->rdstate() & ~ios_base::eofbit;
1272    this->clear(__state);
1273    sentry __sen(*this, true);
1274    if (__sen)
1275    {
1276#ifndef _LIBCPP_NO_EXCEPTIONS
1277        try
1278        {
1279#endif // _LIBCPP_NO_EXCEPTIONS
1280            if (this->rdbuf()->pubseekpos(__pos, ios_base::in) == pos_type(-1))
1281                __state |= ios_base::failbit;
1282#ifndef _LIBCPP_NO_EXCEPTIONS
1283        }
1284        catch (...)
1285        {
1286            __state |= ios_base::badbit;
1287            this->__setstate_nothrow(__state);
1288            if (this->exceptions() & ios_base::badbit)
1289            {
1290                throw;
1291            }
1292        }
1293#endif // _LIBCPP_NO_EXCEPTIONS
1294        this->setstate(__state);
1295    }
1296    return *this;
1297}
1298
1299template<class _CharT, class _Traits>
1300basic_istream<_CharT, _Traits>&
1301basic_istream<_CharT, _Traits>::seekg(off_type __off, ios_base::seekdir __dir)
1302{
1303    ios_base::iostate __state = this->rdstate() & ~ios_base::eofbit;
1304    this->clear(__state);
1305    sentry __sen(*this, true);
1306    if (__sen)
1307    {
1308#ifndef _LIBCPP_NO_EXCEPTIONS
1309        try
1310        {
1311#endif // _LIBCPP_NO_EXCEPTIONS
1312            if (this->rdbuf()->pubseekoff(__off, __dir, ios_base::in) == pos_type(-1))
1313                __state |= ios_base::failbit;
1314#ifndef _LIBCPP_NO_EXCEPTIONS
1315        }
1316        catch (...)
1317        {
1318            __state |= ios_base::badbit;
1319            this->__setstate_nothrow(__state);
1320            if (this->exceptions() & ios_base::badbit)
1321            {
1322                throw;
1323            }
1324        }
1325#endif // _LIBCPP_NO_EXCEPTIONS
1326        this->setstate(__state);
1327    }
1328    return *this;
1329}
1330
1331template <class _CharT, class _Traits>
1332_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
1333ws(basic_istream<_CharT, _Traits>& __is)
1334{
1335    ios_base::iostate __state = ios_base::goodbit;
1336    typename basic_istream<_CharT, _Traits>::sentry __sen(__is, true);
1337    if (__sen)
1338    {
1339#ifndef _LIBCPP_NO_EXCEPTIONS
1340        try
1341        {
1342#endif // _LIBCPP_NO_EXCEPTIONS
1343            const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
1344            while (true)
1345            {
1346                typename _Traits::int_type __i = __is.rdbuf()->sgetc();
1347                if (_Traits::eq_int_type(__i, _Traits::eof()))
1348                {
1349                   __state |= ios_base::eofbit;
1350                   break;
1351                }
1352                if (!__ct.is(__ct.space, _Traits::to_char_type(__i)))
1353                    break;
1354                __is.rdbuf()->sbumpc();
1355            }
1356#ifndef _LIBCPP_NO_EXCEPTIONS
1357        }
1358        catch (...)
1359        {
1360            __state |= ios_base::badbit;
1361            __is.__setstate_nothrow(__state);
1362            if (__is.exceptions() & ios_base::badbit)
1363            {
1364                throw;
1365            }
1366        }
1367#endif // _LIBCPP_NO_EXCEPTIONS
1368        __is.setstate(__state);
1369    }
1370    return __is;
1371}
1372
1373template <class _Stream, class _Tp, class = void>
1374struct __is_istreamable : false_type { };
1375
1376template <class _Stream, class _Tp>
1377struct __is_istreamable<_Stream, _Tp, decltype(
1378    std::declval<_Stream>() >> std::declval<_Tp>(), void()
1379)> : true_type { };
1380
1381template <class _Stream, class _Tp, class = typename enable_if<
1382    _And<is_base_of<ios_base, _Stream>,
1383         __is_istreamable<_Stream&, _Tp&&> >::value
1384>::type>
1385_LIBCPP_INLINE_VISIBILITY
1386_Stream&& operator>>(_Stream&& __is, _Tp&& __x)
1387{
1388    __is >> _VSTD::forward<_Tp>(__x);
1389    return _VSTD::move(__is);
1390}
1391
1392template <class _CharT, class _Traits>
1393class _LIBCPP_TEMPLATE_VIS basic_iostream
1394    : public basic_istream<_CharT, _Traits>,
1395      public basic_ostream<_CharT, _Traits>
1396{
1397public:
1398    // types:
1399    typedef _CharT                         char_type;
1400    typedef _Traits                        traits_type;
1401    typedef typename traits_type::int_type int_type;
1402    typedef typename traits_type::pos_type pos_type;
1403    typedef typename traits_type::off_type off_type;
1404
1405    // constructor/destructor
1406    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
1407    explicit basic_iostream(basic_streambuf<char_type, traits_type>* __sb)
1408      : basic_istream<_CharT, _Traits>(__sb)
1409    {}
1410
1411    ~basic_iostream() override;
1412protected:
1413    inline _LIBCPP_INLINE_VISIBILITY
1414    basic_iostream(basic_iostream&& __rhs);
1415
1416    // assign/swap
1417    inline _LIBCPP_INLINE_VISIBILITY
1418    basic_iostream& operator=(basic_iostream&& __rhs);
1419
1420    inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1
1421    void swap(basic_iostream& __rhs)
1422    { basic_istream<char_type, traits_type>::swap(__rhs); }
1423};
1424
1425template <class _CharT, class _Traits>
1426basic_iostream<_CharT, _Traits>::basic_iostream(basic_iostream&& __rhs)
1427    : basic_istream<_CharT, _Traits>(_VSTD::move(__rhs))
1428{
1429}
1430
1431template <class _CharT, class _Traits>
1432basic_iostream<_CharT, _Traits>&
1433basic_iostream<_CharT, _Traits>::operator=(basic_iostream&& __rhs)
1434{
1435    swap(__rhs);
1436    return *this;
1437}
1438
1439template <class _CharT, class _Traits>
1440basic_iostream<_CharT, _Traits>::~basic_iostream()
1441{
1442}
1443
1444template<class _CharT, class _Traits, class _Allocator>
1445_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
1446operator>>(basic_istream<_CharT, _Traits>& __is,
1447           basic_string<_CharT, _Traits, _Allocator>& __str)
1448{
1449    ios_base::iostate __state = ios_base::goodbit;
1450    typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
1451    if (__sen)
1452    {
1453#ifndef _LIBCPP_NO_EXCEPTIONS
1454        try
1455        {
1456#endif
1457            __str.clear();
1458            streamsize __n = __is.width();
1459            if (__n <= 0)
1460                __n = __str.max_size();
1461            if (__n <= 0)
1462                __n = numeric_limits<streamsize>::max();
1463            streamsize __c = 0;
1464            const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
1465            while (__c < __n)
1466            {
1467                typename _Traits::int_type __i = __is.rdbuf()->sgetc();
1468                if (_Traits::eq_int_type(__i, _Traits::eof()))
1469                {
1470                   __state |= ios_base::eofbit;
1471                   break;
1472                }
1473                _CharT __ch = _Traits::to_char_type(__i);
1474                if (__ct.is(__ct.space, __ch))
1475                    break;
1476                __str.push_back(__ch);
1477                ++__c;
1478                 __is.rdbuf()->sbumpc();
1479            }
1480            __is.width(0);
1481            if (__c == 0)
1482               __state |= ios_base::failbit;
1483#ifndef _LIBCPP_NO_EXCEPTIONS
1484        }
1485        catch (...)
1486        {
1487            __state |= ios_base::badbit;
1488            __is.__setstate_nothrow(__state);
1489            if (__is.exceptions() & ios_base::badbit)
1490            {
1491                throw;
1492            }
1493        }
1494#endif
1495        __is.setstate(__state);
1496    }
1497    return __is;
1498}
1499
1500template<class _CharT, class _Traits, class _Allocator>
1501_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
1502getline(basic_istream<_CharT, _Traits>& __is,
1503        basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm)
1504{
1505    ios_base::iostate __state = ios_base::goodbit;
1506    typename basic_istream<_CharT, _Traits>::sentry __sen(__is, true);
1507    if (__sen)
1508    {
1509#ifndef _LIBCPP_NO_EXCEPTIONS
1510        try
1511        {
1512#endif
1513            __str.clear();
1514            streamsize __extr = 0;
1515            while (true)
1516            {
1517                typename _Traits::int_type __i = __is.rdbuf()->sbumpc();
1518                if (_Traits::eq_int_type(__i, _Traits::eof()))
1519                {
1520                   __state |= ios_base::eofbit;
1521                   break;
1522                }
1523                ++__extr;
1524                _CharT __ch = _Traits::to_char_type(__i);
1525                if (_Traits::eq(__ch, __dlm))
1526                    break;
1527                __str.push_back(__ch);
1528                if (__str.size() == __str.max_size())
1529                {
1530                    __state |= ios_base::failbit;
1531                    break;
1532                }
1533            }
1534            if (__extr == 0)
1535               __state |= ios_base::failbit;
1536#ifndef _LIBCPP_NO_EXCEPTIONS
1537        }
1538        catch (...)
1539        {
1540            __state |= ios_base::badbit;
1541            __is.__setstate_nothrow(__state);
1542            if (__is.exceptions() & ios_base::badbit)
1543            {
1544                throw;
1545            }
1546        }
1547#endif
1548        __is.setstate(__state);
1549    }
1550    return __is;
1551}
1552
1553template<class _CharT, class _Traits, class _Allocator>
1554inline _LIBCPP_INLINE_VISIBILITY
1555basic_istream<_CharT, _Traits>&
1556getline(basic_istream<_CharT, _Traits>& __is,
1557        basic_string<_CharT, _Traits, _Allocator>& __str)
1558{
1559    return std::getline(__is, __str, __is.widen('\n'));
1560}
1561
1562template<class _CharT, class _Traits, class _Allocator>
1563inline _LIBCPP_INLINE_VISIBILITY
1564basic_istream<_CharT, _Traits>&
1565getline(basic_istream<_CharT, _Traits>&& __is,
1566        basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm)
1567{
1568    return std::getline(__is, __str, __dlm);
1569}
1570
1571template<class _CharT, class _Traits, class _Allocator>
1572inline _LIBCPP_INLINE_VISIBILITY
1573basic_istream<_CharT, _Traits>&
1574getline(basic_istream<_CharT, _Traits>&& __is,
1575        basic_string<_CharT, _Traits, _Allocator>& __str)
1576{
1577    return std::getline(__is, __str, __is.widen('\n'));
1578}
1579
1580template <class _CharT, class _Traits, size_t _Size>
1581_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
1582operator>>(basic_istream<_CharT, _Traits>& __is, bitset<_Size>& __x)
1583{
1584    ios_base::iostate __state = ios_base::goodbit;
1585    typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
1586    if (__sen)
1587    {
1588#ifndef _LIBCPP_NO_EXCEPTIONS
1589        try
1590        {
1591#endif
1592            basic_string<_CharT, _Traits> __str;
1593            const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
1594            size_t __c = 0;
1595            _CharT __zero = __ct.widen('0');
1596            _CharT __one = __ct.widen('1');
1597            while (__c != _Size)
1598            {
1599                typename _Traits::int_type __i = __is.rdbuf()->sgetc();
1600                if (_Traits::eq_int_type(__i, _Traits::eof()))
1601                {
1602                   __state |= ios_base::eofbit;
1603                   break;
1604                }
1605                _CharT __ch = _Traits::to_char_type(__i);
1606                if (!_Traits::eq(__ch, __zero) && !_Traits::eq(__ch, __one))
1607                    break;
1608                __str.push_back(__ch);
1609                ++__c;
1610                 __is.rdbuf()->sbumpc();
1611            }
1612            __x = bitset<_Size>(__str);
1613            if (_Size > 0 && __c == 0)
1614               __state |= ios_base::failbit;
1615#ifndef _LIBCPP_NO_EXCEPTIONS
1616        }
1617        catch (...)
1618        {
1619            __state |= ios_base::badbit;
1620            __is.__setstate_nothrow(__state);
1621            if (__is.exceptions() & ios_base::badbit)
1622            {
1623                throw;
1624            }
1625        }
1626#endif
1627        __is.setstate(__state);
1628    }
1629    return __is;
1630}
1631
1632extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_istream<char>;
1633#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
1634extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_istream<wchar_t>;
1635#endif
1636extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_iostream<char>;
1637
1638_LIBCPP_END_NAMESPACE_STD
1639
1640#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
1641#  include <concepts>
1642#  include <type_traits>
1643#endif
1644
1645_LIBCPP_POP_MACROS
1646
1647#endif // _LIBCPP_ISTREAM
1648