fstream revision 241900 
1// -*- C++ -*-
2//===------------------------- fstream ------------------------------------===//
3//
4//                     The LLVM Compiler Infrastructure
5//
6// This file is dual licensed under the MIT and the University of Illinois Open
7// Source Licenses. See LICENSE.TXT for details.
8//
9//===----------------------------------------------------------------------===//
10
11#ifndef _LIBCPP_FSTREAM
12#define _LIBCPP_FSTREAM
13
14/*
15    fstream synopsis
16
17template <class charT, class traits = char_traits<charT> >
18class basic_filebuf
19    : public basic_streambuf<charT, traits>
20{
21public:
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    // 27.9.1.2 Constructors/destructor:
29    basic_filebuf();
30    basic_filebuf(basic_filebuf&& rhs);
31    virtual ~basic_filebuf();
32
33    // 27.9.1.3 Assign/swap:
34    basic_filebuf& operator=(basic_filebuf&& rhs);
35    void swap(basic_filebuf& rhs);
36
37    // 27.9.1.4 Members:
38    bool is_open() const;
39    basic_filebuf* open(const char* s, ios_base::openmode mode);
40    basic_filebuf* open(const string& s, ios_base::openmode mode);
41    basic_filebuf* close();
42
43protected:
44    // 27.9.1.5 Overridden virtual functions:
45    virtual streamsize showmanyc();
46    virtual int_type underflow();
47    virtual int_type uflow();
48    virtual int_type pbackfail(int_type c = traits_type::eof());
49    virtual int_type overflow (int_type c = traits_type::eof());
50    virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* s, streamsize n);
51    virtual pos_type seekoff(off_type off, ios_base::seekdir way,
52                             ios_base::openmode which = ios_base::in | ios_base::out);
53    virtual pos_type seekpos(pos_type sp,
54                             ios_base::openmode which = ios_base::in | ios_base::out);
55    virtual int sync();
56    virtual void imbue(const locale& loc);
57};
58
59template <class charT, class traits>
60  void
61  swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y);
62
63typedef basic_filebuf<char>    filebuf;
64typedef basic_filebuf<wchar_t> wfilebuf;
65
66template <class charT, class traits = char_traits<charT> >
67class basic_ifstream
68    : public basic_istream<charT,traits>
69{
70public:
71    typedef charT                          char_type;
72    typedef traits                         traits_type;
73    typedef typename traits_type::int_type int_type;
74    typedef typename traits_type::pos_type pos_type;
75    typedef typename traits_type::off_type off_type;
76
77    basic_ifstream();
78    explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in);
79    explicit basic_ifstream(const string& s, ios_base::openmode mode = ios_base::in);
80    basic_ifstream(basic_ifstream&& rhs);
81
82    basic_ifstream& operator=(basic_ifstream&& rhs);
83    void swap(basic_ifstream& rhs);
84
85    basic_filebuf<char_type, traits_type>* rdbuf() const;
86    bool is_open() const;
87    void open(const char* s, ios_base::openmode mode = ios_base::in);
88    void open(const string& s, ios_base::openmode mode = ios_base::in);
89    void close();
90};
91
92template <class charT, class traits>
93  void
94  swap(basic_ifstream<charT, traits>& x, basic_ifstream<charT, traits>& y);
95
96typedef basic_ifstream<char>    ifstream;
97typedef basic_ifstream<wchar_t> wifstream;
98
99template <class charT, class traits = char_traits<charT> >
100class basic_ofstream
101    : public basic_ostream<charT,traits>
102{
103public:
104    typedef charT                          char_type;
105    typedef traits                         traits_type;
106    typedef typename traits_type::int_type int_type;
107    typedef typename traits_type::pos_type pos_type;
108    typedef typename traits_type::off_type off_type;
109
110    basic_ofstream();
111    explicit basic_ofstream(const char* s, ios_base::openmode mode = ios_base::out);
112    explicit basic_ofstream(const string& s, ios_base::openmode mode = ios_base::out);
113    basic_ofstream(basic_ofstream&& rhs);
114
115    basic_ofstream& operator=(basic_ofstream&& rhs);
116    void swap(basic_ofstream& rhs);
117
118    basic_filebuf<char_type, traits_type>* rdbuf() const;
119    bool is_open() const;
120    void open(const char* s, ios_base::openmode mode = ios_base::out);
121    void open(const string& s, ios_base::openmode mode = ios_base::out);
122    void close();
123};
124
125template <class charT, class traits>
126  void
127  swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);
128
129typedef basic_ofstream<char>    ofstream;
130typedef basic_ofstream<wchar_t> wofstream;
131
132template <class charT, class traits=char_traits<charT> >
133class basic_fstream
134    : public basic_iostream<charT,traits>
135{
136public:
137    typedef charT                          char_type;
138    typedef traits                         traits_type;
139    typedef typename traits_type::int_type int_type;
140    typedef typename traits_type::pos_type pos_type;
141    typedef typename traits_type::off_type off_type;
142
143    basic_fstream();
144    explicit basic_fstream(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
145    explicit basic_fstream(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
146    basic_fstream(basic_fstream&& rhs);
147
148    basic_fstream& operator=(basic_fstream&& rhs);
149    void swap(basic_fstream& rhs);
150
151    basic_filebuf<char_type, traits_type>* rdbuf() const;
152    bool is_open() const;
153    void open(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
154    void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
155    void close();
156};
157
158template <class charT, class traits>
159  void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y);
160
161typedef basic_fstream<char>    fstream;
162typedef basic_fstream<wchar_t> wfstream;
163
164}  // std
165
166*/
167
168#include <__config>
169#include <ostream>
170#include <istream>
171#include <__locale>
172#include <cstdio>
173
174#include <__undef_min_max>
175
176#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
177#pragma GCC system_header
178#endif
179
180_LIBCPP_BEGIN_NAMESPACE_STD
181
182template <class _CharT, class _Traits>
183class _LIBCPP_VISIBLE basic_filebuf
184    : public basic_streambuf<_CharT, _Traits>
185{
186public:
187    typedef _CharT                           char_type;
188    typedef _Traits                          traits_type;
189    typedef typename traits_type::int_type   int_type;
190    typedef typename traits_type::pos_type   pos_type;
191    typedef typename traits_type::off_type   off_type;
192    typedef typename traits_type::state_type state_type;
193
194    // 27.9.1.2 Constructors/destructor:
195    basic_filebuf();
196#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
197    basic_filebuf(basic_filebuf&& __rhs);
198#endif
199    virtual ~basic_filebuf();
200
201    // 27.9.1.3 Assign/swap:
202#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
203    basic_filebuf& operator=(basic_filebuf&& __rhs);
204#endif
205    void swap(basic_filebuf& __rhs);
206
207    // 27.9.1.4 Members:
208    bool is_open() const;
209    basic_filebuf* open(const char* __s, ios_base::openmode __mode);
210    basic_filebuf* open(const string& __s, ios_base::openmode __mode);
211    basic_filebuf* close();
212
213protected:
214    // 27.9.1.5 Overridden virtual functions:
215    virtual int_type underflow();
216    virtual int_type pbackfail(int_type __c = traits_type::eof());
217    virtual int_type overflow (int_type __c = traits_type::eof());
218    virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n);
219    virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
220                             ios_base::openmode __wch = ios_base::in | ios_base::out);
221    virtual pos_type seekpos(pos_type __sp,
222                             ios_base::openmode __wch = ios_base::in | ios_base::out);
223    virtual int sync();
224    virtual void imbue(const locale& __loc);
225
226private:
227    char*       __extbuf_;
228    const char* __extbufnext_;
229    const char* __extbufend_;
230    char __extbuf_min_[8];
231    size_t __ebs_;
232    char_type* __intbuf_;
233    size_t __ibs_;
234    FILE* __file_;
235    const codecvt<char_type, char, state_type>* __cv_;
236    state_type __st_;
237    state_type __st_last_;
238    ios_base::openmode __om_;
239    ios_base::openmode __cm_;
240    bool __owns_eb_;
241    bool __owns_ib_;
242    bool __always_noconv_;
243
244    bool __read_mode();
245    void __write_mode();
246};
247
248template <class _CharT, class _Traits>
249basic_filebuf<_CharT, _Traits>::basic_filebuf()
250    : __extbuf_(0),
251      __extbufnext_(0),
252      __extbufend_(0),
253      __ebs_(0),
254      __intbuf_(0),
255      __ibs_(0),
256      __file_(0),
257      __cv_(nullptr),
258      __st_(),
259      __st_last_(),
260      __om_(0),
261      __cm_(0),
262      __owns_eb_(false),
263      __owns_ib_(false),
264      __always_noconv_(false)
265{
266    if (has_facet<codecvt<char_type, char, state_type> >(this->getloc()))
267    {
268        __cv_ = &use_facet<codecvt<char_type, char, state_type> >(this->getloc());
269        __always_noconv_ = __cv_->always_noconv();
270    }
271    setbuf(0, 4096);
272}
273
274#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
275
276template <class _CharT, class _Traits>
277basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs)
278    : basic_streambuf<_CharT, _Traits>(__rhs)
279{
280    if (__rhs.__extbuf_ == __rhs.__extbuf_min_)
281    {
282        __extbuf_ = __extbuf_min_;
283        __extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_);
284        __extbufend_ = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_);
285    }
286    else
287    {
288        __extbuf_ = __rhs.__extbuf_;
289        __extbufnext_ = __rhs.__extbufnext_;
290        __extbufend_ = __rhs.__extbufend_;
291    }
292    __ebs_ = __rhs.__ebs_;
293    __intbuf_ = __rhs.__intbuf_;
294    __ibs_ = __rhs.__ibs_;
295    __file_ = __rhs.__file_;
296    __cv_ = __rhs.__cv_;
297    __st_ = __rhs.__st_;
298    __st_last_ = __rhs.__st_last_;
299    __om_ = __rhs.__om_;
300    __cm_ = __rhs.__cm_;
301    __owns_eb_ = __rhs.__owns_eb_;
302    __owns_ib_ = __rhs.__owns_ib_;
303    __always_noconv_ = __rhs.__always_noconv_;
304    if (__rhs.pbase())
305    {
306        if (__rhs.pbase() == __rhs.__intbuf_)
307            this->setp(__intbuf_, __intbuf_ + (__rhs. epptr() - __rhs.pbase()));
308        else
309            this->setp((char_type*)__extbuf_,
310                       (char_type*)__extbuf_ + (__rhs. epptr() - __rhs.pbase()));
311        this->pbump(__rhs. pptr() - __rhs.pbase());
312    }
313    else if (__rhs.eback())
314    {
315        if (__rhs.eback() == __rhs.__intbuf_)
316            this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()),
317                                  __intbuf_ + (__rhs.egptr() - __rhs.eback()));
318        else
319            this->setg((char_type*)__extbuf_,
320                       (char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()),
321                       (char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback()));
322    }
323    __rhs.__extbuf_ = 0;
324    __rhs.__extbufnext_ = 0;
325    __rhs.__extbufend_ = 0;
326    __rhs.__ebs_ = 0;
327    __rhs.__intbuf_ = 0;
328    __rhs.__ibs_ = 0;
329    __rhs.__file_ = 0;
330    __rhs.__st_ = state_type();
331    __rhs.__st_last_ = state_type();
332    __rhs.__om_ = 0;
333    __rhs.__cm_ = 0;
334    __rhs.__owns_eb_ = false;
335    __rhs.__owns_ib_ = false;
336    __rhs.setg(0, 0, 0);
337    __rhs.setp(0, 0);
338}
339
340template <class _CharT, class _Traits>
341inline _LIBCPP_INLINE_VISIBILITY
342basic_filebuf<_CharT, _Traits>&
343basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs)
344{
345    close();
346    swap(__rhs);
347    return *this;
348}
349
350#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
351
352template <class _CharT, class _Traits>
353basic_filebuf<_CharT, _Traits>::~basic_filebuf()
354{
355#ifndef _LIBCPP_NO_EXCEPTIONS
356    try
357    {
358#endif  // _LIBCPP_NO_EXCEPTIONS
359        close();
360#ifndef _LIBCPP_NO_EXCEPTIONS
361    }
362    catch (...)
363    {
364    }
365#endif  // _LIBCPP_NO_EXCEPTIONS
366    if (__owns_eb_)
367        delete [] __extbuf_;
368    if (__owns_ib_)
369        delete [] __intbuf_;
370}
371
372template <class _CharT, class _Traits>
373void
374basic_filebuf<_CharT, _Traits>::swap(basic_filebuf& __rhs)
375{
376    basic_streambuf<char_type, traits_type>::swap(__rhs);
377    if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
378    {
379        _VSTD::swap(__extbuf_, __rhs.__extbuf_);
380        _VSTD::swap(__extbufnext_, __rhs.__extbufnext_);
381        _VSTD::swap(__extbufend_, __rhs.__extbufend_);
382    }
383    else
384    {
385        ptrdiff_t __ln = __extbufnext_ - __extbuf_;
386        ptrdiff_t __le = __extbufend_ - __extbuf_;
387        ptrdiff_t __rn = __rhs.__extbufnext_ - __rhs.__extbuf_;
388        ptrdiff_t __re = __rhs.__extbufend_ - __rhs.__extbuf_;
389        if (__extbuf_ == __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
390        {
391            __extbuf_ = __rhs.__extbuf_;
392            __rhs.__extbuf_ = __rhs.__extbuf_min_;
393        }
394        else if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ == __rhs.__extbuf_min_)
395        {
396            __rhs.__extbuf_ = __extbuf_;
397            __extbuf_ = __extbuf_min_;
398        }
399        __extbufnext_ = __extbuf_ + __rn;
400        __extbufend_ = __extbuf_ + __re;
401        __rhs.__extbufnext_ = __rhs.__extbuf_ + __ln;
402        __rhs.__extbufend_ = __rhs.__extbuf_ + __le;
403    }
404    _VSTD::swap(__ebs_, __rhs.__ebs_);
405    _VSTD::swap(__intbuf_, __rhs.__intbuf_);
406    _VSTD::swap(__ibs_, __rhs.__ibs_);
407    _VSTD::swap(__file_, __rhs.__file_);
408    _VSTD::swap(__cv_, __rhs.__cv_);
409    _VSTD::swap(__st_, __rhs.__st_);
410    _VSTD::swap(__st_last_, __rhs.__st_last_);
411    _VSTD::swap(__om_, __rhs.__om_);
412    _VSTD::swap(__cm_, __rhs.__cm_);
413    _VSTD::swap(__owns_eb_, __rhs.__owns_eb_);
414    _VSTD::swap(__owns_ib_, __rhs.__owns_ib_);
415    _VSTD::swap(__always_noconv_, __rhs.__always_noconv_);
416    if (this->eback() == (char_type*)__rhs.__extbuf_min_)
417    {
418        ptrdiff_t __n = this->gptr() - this->eback();
419        ptrdiff_t __e = this->egptr() - this->eback();
420        this->setg((char_type*)__extbuf_min_,
421                   (char_type*)__extbuf_min_ + __n,
422                   (char_type*)__extbuf_min_ + __e);
423    }
424    else if (this->pbase() == (char_type*)__rhs.__extbuf_min_)
425    {
426        ptrdiff_t __n = this->pptr() - this->pbase();
427        ptrdiff_t __e = this->epptr() - this->pbase();
428        this->setp((char_type*)__extbuf_min_,
429                   (char_type*)__extbuf_min_ + __e);
430        this->pbump(__n);
431    }
432    if (__rhs.eback() == (char_type*)__extbuf_min_)
433    {
434        ptrdiff_t __n = __rhs.gptr() - __rhs.eback();
435        ptrdiff_t __e = __rhs.egptr() - __rhs.eback();
436        __rhs.setg((char_type*)__rhs.__extbuf_min_,
437                   (char_type*)__rhs.__extbuf_min_ + __n,
438                   (char_type*)__rhs.__extbuf_min_ + __e);
439    }
440    else if (__rhs.pbase() == (char_type*)__extbuf_min_)
441    {
442        ptrdiff_t __n = __rhs.pptr() - __rhs.pbase();
443        ptrdiff_t __e = __rhs.epptr() - __rhs.pbase();
444        __rhs.setp((char_type*)__rhs.__extbuf_min_,
445                   (char_type*)__rhs.__extbuf_min_ + __e);
446        __rhs.pbump(__n);
447    }
448}
449
450template <class _CharT, class _Traits>
451inline _LIBCPP_INLINE_VISIBILITY
452void
453swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y)
454{
455    __x.swap(__y);
456}
457
458template <class _CharT, class _Traits>
459inline _LIBCPP_INLINE_VISIBILITY
460bool
461basic_filebuf<_CharT, _Traits>::is_open() const
462{
463    return __file_ != 0;
464}
465
466template <class _CharT, class _Traits>
467basic_filebuf<_CharT, _Traits>*
468basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
469{
470    basic_filebuf<_CharT, _Traits>* __rt = 0;
471    if (__file_ == 0)
472    {
473        __rt = this;
474        const char* __mdstr;
475        switch (__mode & ~ios_base::ate)
476        {
477        case ios_base::out:
478        case ios_base::out | ios_base::trunc:
479            __mdstr = "w";
480            break;
481        case ios_base::out | ios_base::app:
482        case ios_base::app:
483            __mdstr = "a";
484            break;
485        case ios_base::in:
486            __mdstr = "r";
487            break;
488        case ios_base::in | ios_base::out:
489            __mdstr = "r+";
490            break;
491        case ios_base::in | ios_base::out | ios_base::trunc:
492            __mdstr = "w+";
493            break;
494        case ios_base::in | ios_base::out | ios_base::app:
495        case ios_base::in | ios_base::app:
496            __mdstr = "a+";
497            break;
498        case ios_base::out | ios_base::binary:
499        case ios_base::out | ios_base::trunc | ios_base::binary:
500            __mdstr = "wb";
501            break;
502        case ios_base::out | ios_base::app | ios_base::binary:
503        case ios_base::app | ios_base::binary:
504            __mdstr = "ab";
505            break;
506        case ios_base::in | ios_base::binary:
507            __mdstr = "rb";
508            break;
509        case ios_base::in | ios_base::out | ios_base::binary:
510            __mdstr = "r+b";
511            break;
512        case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
513            __mdstr = "w+b";
514            break;
515        case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
516        case ios_base::in | ios_base::app | ios_base::binary:
517            __mdstr = "a+b";
518            break;
519        default:
520            __rt = 0;
521            break;
522        }
523        if (__rt)
524        {
525            __file_ = fopen(__s, __mdstr);
526            if (__file_)
527            {
528                __om_ = __mode;
529                if (__mode & ios_base::ate)
530                {
531                    if (fseek(__file_, 0, SEEK_END))
532                    {
533                        fclose(__file_);
534                        __file_ = 0;
535                        __rt = 0;
536                    }
537                }
538            }
539            else
540                __rt = 0;
541        }
542    }
543    return __rt;
544}
545
546template <class _CharT, class _Traits>
547inline _LIBCPP_INLINE_VISIBILITY
548basic_filebuf<_CharT, _Traits>*
549basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
550{
551    return open(__s.c_str(), __mode);
552}
553
554template <class _CharT, class _Traits>
555basic_filebuf<_CharT, _Traits>*
556basic_filebuf<_CharT, _Traits>::close()
557{
558    basic_filebuf<_CharT, _Traits>* __rt = 0;
559    if (__file_)
560    {
561        __rt = this;
562        unique_ptr<FILE, int(*)(FILE*)> __h(__file_, fclose);
563        if (sync())
564            __rt = 0;
565        if (fclose(__h.release()) == 0)
566            __file_ = 0;
567        else
568            __rt = 0;
569    }
570    return __rt;
571}
572
573template <class _CharT, class _Traits>
574typename basic_filebuf<_CharT, _Traits>::int_type
575basic_filebuf<_CharT, _Traits>::underflow()
576{
577    if (__file_ == 0)
578        return traits_type::eof();
579    bool __initial = __read_mode();
580    char_type __1buf;
581    if (this->gptr() == 0)
582        this->setg(&__1buf, &__1buf+1, &__1buf+1);
583    const size_t __unget_sz = __initial ? 0 : min<size_t>((this->egptr() - this->eback()) / 2, 4);
584    int_type __c = traits_type::eof();
585    if (this->gptr() == this->egptr())
586    {
587        memmove(this->eback(), this->egptr() - __unget_sz, __unget_sz * sizeof(char_type));
588        if (__always_noconv_)
589        {
590            size_t __nmemb = static_cast<size_t>(this->egptr() - this->eback() - __unget_sz);
591            __nmemb = fread(this->eback() + __unget_sz, 1, __nmemb, __file_);
592            if (__nmemb != 0)
593            {
594                this->setg(this->eback(),
595                           this->eback() + __unget_sz,
596                           this->eback() + __unget_sz + __nmemb);
597                __c = traits_type::to_int_type(*this->gptr());
598            }
599        }
600        else
601        {
602            memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
603            __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
604            __extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
605            size_t __nmemb = _VSTD::min(static_cast<size_t>(__ibs_ - __unget_sz),
606                                 static_cast<size_t>(__extbufend_ - __extbufnext_));
607            codecvt_base::result __r;
608            __st_last_ = __st_;
609            size_t __nr = fread((void*)__extbufnext_, 1, __nmemb, __file_);
610            if (__nr != 0)
611            {
612#ifndef _LIBCPP_NO_EXCEPTIONS
613                if (!__cv_)
614                    throw bad_cast();
615#endif
616                __extbufend_ = __extbufnext_ + __nr;
617                char_type*  __inext;
618                __r = __cv_->in(__st_, __extbuf_, __extbufend_, __extbufnext_,
619                                       this->eback() + __unget_sz,
620                                       this->eback() + __ibs_, __inext);
621                if (__r == codecvt_base::noconv)
622                {
623                    this->setg((char_type*)__extbuf_, (char_type*)__extbuf_, (char_type*)__extbufend_);
624                    __c = traits_type::to_int_type(*this->gptr());
625                }
626                else if (__inext != this->eback() + __unget_sz)
627                {
628                    this->setg(this->eback(), this->eback() + __unget_sz, __inext);
629                    __c = traits_type::to_int_type(*this->gptr());
630                }
631            }
632        }
633    }
634    else
635        __c = traits_type::to_int_type(*this->gptr());
636    if (this->eback() == &__1buf)
637        this->setg(0, 0, 0);
638    return __c;
639}
640
641template <class _CharT, class _Traits>
642typename basic_filebuf<_CharT, _Traits>::int_type
643basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c)
644{
645    if (__file_ && this->eback() < this->gptr())
646    {
647        if (traits_type::eq_int_type(__c, traits_type::eof()))
648        {
649            this->gbump(-1);
650            return traits_type::not_eof(__c);
651        }
652        if ((__om_ & ios_base::out) ||
653            traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
654        {
655            this->gbump(-1);
656            *this->gptr() = traits_type::to_char_type(__c);
657            return __c;
658        }
659    }
660    return traits_type::eof();
661}
662
663template <class _CharT, class _Traits>
664typename basic_filebuf<_CharT, _Traits>::int_type
665basic_filebuf<_CharT, _Traits>::overflow(int_type __c)
666{
667    if (__file_ == 0)
668        return traits_type::eof();
669    __write_mode();
670    char_type __1buf;
671    char_type* __pb_save = this->pbase();
672    char_type* __epb_save = this->epptr();
673    if (!traits_type::eq_int_type(__c, traits_type::eof()))
674    {
675        if (this->pptr() == 0)
676            this->setp(&__1buf, &__1buf+1);
677        *this->pptr() = traits_type::to_char_type(__c);
678        this->pbump(1);
679    }
680    if (this->pptr() != this->pbase())
681    {
682        if (__always_noconv_)
683        {
684            size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
685            if (fwrite(this->pbase(), sizeof(char_type), __nmemb, __file_) != __nmemb)
686                return traits_type::eof();
687        }
688        else
689        {
690            char* __extbe = __extbuf_;
691            codecvt_base::result __r;
692            do
693            {
694#ifndef _LIBCPP_NO_EXCEPTIONS
695                if (!__cv_)
696                    throw bad_cast();
697#endif
698                const char_type* __e;
699                __r = __cv_->out(__st_, this->pbase(), this->pptr(), __e,
700                                        __extbuf_, __extbuf_ + __ebs_, __extbe);
701                if (__e == this->pbase())
702                    return traits_type::eof();
703                if (__r == codecvt_base::noconv)
704                {
705                    size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
706                    if (fwrite(this->pbase(), 1, __nmemb, __file_) != __nmemb)
707                        return traits_type::eof();
708                }
709                else if (__r == codecvt_base::ok || __r == codecvt_base::partial)
710                {
711                    size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
712                    if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
713                        return traits_type::eof();
714                    if (__r == codecvt_base::partial)
715                    {
716                        this->setp((char_type*)__e, this->pptr());
717                        this->pbump(this->epptr() - this->pbase());
718                    }
719                }
720                else
721                    return traits_type::eof();
722            } while (__r == codecvt_base::partial);
723        }
724        this->setp(__pb_save, __epb_save);
725    }
726    return traits_type::not_eof(__c);
727}
728
729template <class _CharT, class _Traits>
730basic_streambuf<_CharT, _Traits>*
731basic_filebuf<_CharT, _Traits>::setbuf(char_type* __s, streamsize __n)
732{
733    this->setg(0, 0, 0);
734    this->setp(0, 0);
735    if (__owns_eb_)
736        delete [] __extbuf_;
737    if (__owns_ib_)
738        delete [] __intbuf_;
739    __ebs_ = __n;
740    if (__ebs_ > sizeof(__extbuf_min_))
741    {
742        if (__always_noconv_ && __s)
743        {
744            __extbuf_ = (char*)__s;
745            __owns_eb_ = false;
746        }
747        else
748        {
749            __extbuf_ = new char[__ebs_];
750            __owns_eb_ = true;
751        }
752    }
753    else
754    {
755        __extbuf_ = __extbuf_min_;
756        __ebs_ = sizeof(__extbuf_min_);
757        __owns_eb_ = false;
758    }
759    if (!__always_noconv_)
760    {
761        __ibs_ = max<streamsize>(__n, sizeof(__extbuf_min_));
762        if (__s && __ibs_ >= sizeof(__extbuf_min_))
763        {
764            __intbuf_ = __s;
765            __owns_ib_ = false;
766        }
767        else
768        {
769            __intbuf_ = new char_type[__ibs_];
770            __owns_ib_ = true;
771        }
772    }
773    else
774    {
775        __ibs_ = 0;
776        __intbuf_ = 0;
777        __owns_ib_ = false;
778    }
779    return this;
780}
781
782template <class _CharT, class _Traits>
783typename basic_filebuf<_CharT, _Traits>::pos_type
784basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way,
785                                        ios_base::openmode)
786{
787#ifndef _LIBCPP_NO_EXCEPTIONS
788    if (!__cv_)
789        throw bad_cast();
790#endif
791    int __width = __cv_->encoding();
792    if (__file_ == 0 || (__width <= 0 && __off != 0) || sync())
793        return pos_type(off_type(-1));
794    // __width > 0 || __off == 0
795    int __whence;
796    switch (__way)
797    {
798    case ios_base::beg:
799        __whence = SEEK_SET;
800        break;
801    case ios_base::cur:
802        __whence = SEEK_CUR;
803        break;
804    case ios_base::end:
805        __whence = SEEK_END;
806        break;
807    default:
808        return pos_type(off_type(-1));
809    }
810    if (fseeko(__file_, __width > 0 ? __width * __off : 0, __whence))
811        return pos_type(off_type(-1));
812    pos_type __r = ftello(__file_);
813    __r.state(__st_);
814    return __r;
815}
816
817template <class _CharT, class _Traits>
818typename basic_filebuf<_CharT, _Traits>::pos_type
819basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode)
820{
821    if (__file_ == 0 || sync())
822        return pos_type(off_type(-1));
823    if (fseeko(__file_, __sp, SEEK_SET))
824        return pos_type(off_type(-1));
825    __st_ = __sp.state();
826    return __sp;
827}
828
829template <class _CharT, class _Traits>
830int
831basic_filebuf<_CharT, _Traits>::sync()
832{
833    if (__file_ == 0)
834        return 0;
835#ifndef _LIBCPP_NO_EXCEPTIONS
836    if (!__cv_)
837        throw bad_cast();
838#endif
839    if (__cm_ & ios_base::out)
840    {
841        if (this->pptr() != this->pbase())
842            if (overflow() == traits_type::eof())
843                return -1;
844        codecvt_base::result __r;
845        do
846        {
847            char* __extbe;
848            __r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
849            size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
850            if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
851                return -1;
852        } while (__r == codecvt_base::partial);
853        if (__r == codecvt_base::error)
854            return -1;
855        if (fflush(__file_))
856            return -1;
857    }
858    else if (__cm_ & ios_base::in)
859    {
860        off_type __c;
861        state_type __state = __st_last_;
862        bool __update_st = false;
863        if (__always_noconv_)
864            __c = this->egptr() - this->gptr();
865        else
866        {
867            int __width = __cv_->encoding();
868            __c = __extbufend_ - __extbufnext_;
869            if (__width > 0)
870                __c += __width * (this->egptr() - this->gptr());
871            else
872            {
873                if (this->gptr() != this->egptr())
874                {
875                    const int __off =  __cv_->length(__state, __extbuf_,
876                                                     __extbufnext_,
877                                                     this->gptr() - this->eback());
878                    __c += __extbufnext_ - __extbuf_ - __off;
879                    __update_st = true;
880                }
881            }
882        }
883        if (fseeko(__file_, -__c, SEEK_CUR))
884            return -1;
885        if (__update_st)
886            __st_ = __state;
887        __extbufnext_ = __extbufend_ = __extbuf_;
888        this->setg(0, 0, 0);
889        __cm_ = 0;
890    }
891    return 0;
892}
893
894template <class _CharT, class _Traits>
895void
896basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc)
897{
898    sync();
899    __cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
900    bool __old_anc = __always_noconv_;
901    __always_noconv_ = __cv_->always_noconv();
902    if (__old_anc != __always_noconv_)
903    {
904        this->setg(0, 0, 0);
905        this->setp(0, 0);
906        // invariant, char_type is char, else we couldn't get here
907        if (__always_noconv_)  // need to dump __intbuf_
908        {
909            if (__owns_eb_)
910                delete [] __extbuf_;
911            __owns_eb_ = __owns_ib_;
912            __ebs_ = __ibs_;
913            __extbuf_ = (char*)__intbuf_;
914            __ibs_ = 0;
915            __intbuf_ = 0;
916            __owns_ib_ = false;
917        }
918        else  // need to obtain an __intbuf_.
919        {     // If __extbuf_ is user-supplied, use it, else new __intbuf_
920            if (!__owns_eb_ && __extbuf_ != __extbuf_min_)
921            {
922                __ibs_ = __ebs_;
923                __intbuf_ = (char_type*)__extbuf_;
924                __owns_ib_ = false;
925                __extbuf_ = new char[__ebs_];
926                __owns_eb_ = true;
927            }
928            else
929            {
930                __ibs_ = __ebs_;
931                __intbuf_ = new char_type[__ibs_];
932                __owns_ib_ = true;
933            }
934        }
935    }
936}
937
938template <class _CharT, class _Traits>
939bool
940basic_filebuf<_CharT, _Traits>::__read_mode()
941{
942    if (!(__cm_ & ios_base::in))
943    {
944        this->setp(0, 0);
945        if (__always_noconv_)
946            this->setg((char_type*)__extbuf_,
947                       (char_type*)__extbuf_ + __ebs_,
948                       (char_type*)__extbuf_ + __ebs_);
949        else
950            this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_);
951        __cm_ = ios_base::in;
952        return true;
953    }
954    return false;
955}
956
957template <class _CharT, class _Traits>
958void
959basic_filebuf<_CharT, _Traits>::__write_mode()
960{
961    if (!(__cm_ & ios_base::out))
962    {
963        this->setg(0, 0, 0);
964        if (__ebs_ > sizeof(__extbuf_min_))
965        {
966            if (__always_noconv_)
967                this->setp((char_type*)__extbuf_,
968                           (char_type*)__extbuf_ + (__ebs_ - 1));
969            else
970                this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1));
971        }
972        else
973            this->setp(0, 0);
974        __cm_ = ios_base::out;
975    }
976}
977
978// basic_ifstream
979
980template <class _CharT, class _Traits>
981class _LIBCPP_VISIBLE basic_ifstream
982    : public basic_istream<_CharT, _Traits>
983{
984public:
985    typedef _CharT                         char_type;
986    typedef _Traits                        traits_type;
987    typedef typename traits_type::int_type int_type;
988    typedef typename traits_type::pos_type pos_type;
989    typedef typename traits_type::off_type off_type;
990
991    basic_ifstream();
992    explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
993    explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
994#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
995    basic_ifstream(basic_ifstream&& __rhs);
996#endif
997
998#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
999    basic_ifstream& operator=(basic_ifstream&& __rhs);
1000#endif
1001    void swap(basic_ifstream& __rhs);
1002
1003    basic_filebuf<char_type, traits_type>* rdbuf() const;
1004    bool is_open() const;
1005    void open(const char* __s, ios_base::openmode __mode = ios_base::in);
1006    void open(const string& __s, ios_base::openmode __mode = ios_base::in);
1007    void close();
1008
1009private:
1010    basic_filebuf<char_type, traits_type> __sb_;
1011};
1012
1013template <class _CharT, class _Traits>
1014inline _LIBCPP_INLINE_VISIBILITY
1015basic_ifstream<_CharT, _Traits>::basic_ifstream()
1016    : basic_istream<char_type, traits_type>(&__sb_)
1017{
1018}
1019
1020template <class _CharT, class _Traits>
1021inline _LIBCPP_INLINE_VISIBILITY
1022basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode)
1023    : basic_istream<char_type, traits_type>(&__sb_)
1024{
1025    if (__sb_.open(__s, __mode | ios_base::in) == 0)
1026        this->setstate(ios_base::failbit);
1027}
1028
1029template <class _CharT, class _Traits>
1030inline _LIBCPP_INLINE_VISIBILITY
1031basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
1032    : basic_istream<char_type, traits_type>(&__sb_)
1033{
1034    if (__sb_.open(__s, __mode | ios_base::in) == 0)
1035        this->setstate(ios_base::failbit);
1036}
1037
1038#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1039
1040template <class _CharT, class _Traits>
1041inline _LIBCPP_INLINE_VISIBILITY
1042basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
1043    : basic_istream<char_type, traits_type>(_VSTD::move(__rhs)),
1044      __sb_(_VSTD::move(__rhs.__sb_))
1045{
1046    this->set_rdbuf(&__sb_);
1047}
1048
1049template <class _CharT, class _Traits>
1050inline _LIBCPP_INLINE_VISIBILITY
1051basic_ifstream<_CharT, _Traits>&
1052basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs)
1053{
1054    basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1055    __sb_ = _VSTD::move(__rhs.__sb_);
1056    return *this;
1057}
1058
1059#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1060
1061template <class _CharT, class _Traits>
1062inline _LIBCPP_INLINE_VISIBILITY
1063void
1064basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs)
1065{
1066    basic_istream<char_type, traits_type>::swap(__rhs);
1067    __sb_.swap(__rhs.__sb_);
1068}
1069
1070template <class _CharT, class _Traits>
1071inline _LIBCPP_INLINE_VISIBILITY
1072void
1073swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y)
1074{
1075    __x.swap(__y);
1076}
1077
1078template <class _CharT, class _Traits>
1079inline _LIBCPP_INLINE_VISIBILITY
1080basic_filebuf<_CharT, _Traits>*
1081basic_ifstream<_CharT, _Traits>::rdbuf() const
1082{
1083    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1084}
1085
1086template <class _CharT, class _Traits>
1087inline _LIBCPP_INLINE_VISIBILITY
1088bool
1089basic_ifstream<_CharT, _Traits>::is_open() const
1090{
1091    return __sb_.is_open();
1092}
1093
1094template <class _CharT, class _Traits>
1095void
1096basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1097{
1098    if (__sb_.open(__s, __mode | ios_base::in))
1099        this->clear();
1100    else
1101        this->setstate(ios_base::failbit);
1102}
1103
1104template <class _CharT, class _Traits>
1105void
1106basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1107{
1108    if (__sb_.open(__s, __mode | ios_base::in))
1109        this->clear();
1110    else
1111        this->setstate(ios_base::failbit);
1112}
1113
1114template <class _CharT, class _Traits>
1115inline _LIBCPP_INLINE_VISIBILITY
1116void
1117basic_ifstream<_CharT, _Traits>::close()
1118{
1119    if (__sb_.close() == 0)
1120        this->setstate(ios_base::failbit);
1121}
1122
1123// basic_ofstream
1124
1125template <class _CharT, class _Traits>
1126class _LIBCPP_VISIBLE basic_ofstream
1127    : public basic_ostream<_CharT, _Traits>
1128{
1129public:
1130    typedef _CharT                         char_type;
1131    typedef _Traits                        traits_type;
1132    typedef typename traits_type::int_type int_type;
1133    typedef typename traits_type::pos_type pos_type;
1134    typedef typename traits_type::off_type off_type;
1135
1136    basic_ofstream();
1137    explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
1138    explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
1139#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1140    basic_ofstream(basic_ofstream&& __rhs);
1141#endif
1142
1143#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1144    basic_ofstream& operator=(basic_ofstream&& __rhs);
1145#endif
1146    void swap(basic_ofstream& __rhs);
1147
1148    basic_filebuf<char_type, traits_type>* rdbuf() const;
1149    bool is_open() const;
1150    void open(const char* __s, ios_base::openmode __mode = ios_base::out);
1151    void open(const string& __s, ios_base::openmode __mode = ios_base::out);
1152    void close();
1153
1154private:
1155    basic_filebuf<char_type, traits_type> __sb_;
1156};
1157
1158template <class _CharT, class _Traits>
1159inline _LIBCPP_INLINE_VISIBILITY
1160basic_ofstream<_CharT, _Traits>::basic_ofstream()
1161    : basic_ostream<char_type, traits_type>(&__sb_)
1162{
1163}
1164
1165template <class _CharT, class _Traits>
1166inline _LIBCPP_INLINE_VISIBILITY
1167basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
1168    : basic_ostream<char_type, traits_type>(&__sb_)
1169{
1170    if (__sb_.open(__s, __mode | ios_base::out) == 0)
1171        this->setstate(ios_base::failbit);
1172}
1173
1174template <class _CharT, class _Traits>
1175inline _LIBCPP_INLINE_VISIBILITY
1176basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
1177    : basic_ostream<char_type, traits_type>(&__sb_)
1178{
1179    if (__sb_.open(__s, __mode | ios_base::out) == 0)
1180        this->setstate(ios_base::failbit);
1181}
1182
1183#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1184
1185template <class _CharT, class _Traits>
1186inline _LIBCPP_INLINE_VISIBILITY
1187basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
1188    : basic_ostream<char_type, traits_type>(_VSTD::move(__rhs)),
1189      __sb_(_VSTD::move(__rhs.__sb_))
1190{
1191    this->set_rdbuf(&__sb_);
1192}
1193
1194template <class _CharT, class _Traits>
1195inline _LIBCPP_INLINE_VISIBILITY
1196basic_ofstream<_CharT, _Traits>&
1197basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs)
1198{
1199    basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1200    __sb_ = _VSTD::move(__rhs.__sb_);
1201    return *this;
1202}
1203
1204#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1205
1206template <class _CharT, class _Traits>
1207inline _LIBCPP_INLINE_VISIBILITY
1208void
1209basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs)
1210{
1211    basic_ostream<char_type, traits_type>::swap(__rhs);
1212    __sb_.swap(__rhs.__sb_);
1213}
1214
1215template <class _CharT, class _Traits>
1216inline _LIBCPP_INLINE_VISIBILITY
1217void
1218swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y)
1219{
1220    __x.swap(__y);
1221}
1222
1223template <class _CharT, class _Traits>
1224inline _LIBCPP_INLINE_VISIBILITY
1225basic_filebuf<_CharT, _Traits>*
1226basic_ofstream<_CharT, _Traits>::rdbuf() const
1227{
1228    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1229}
1230
1231template <class _CharT, class _Traits>
1232inline _LIBCPP_INLINE_VISIBILITY
1233bool
1234basic_ofstream<_CharT, _Traits>::is_open() const
1235{
1236    return __sb_.is_open();
1237}
1238
1239template <class _CharT, class _Traits>
1240void
1241basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1242{
1243    if (__sb_.open(__s, __mode | ios_base::out))
1244        this->clear();
1245    else
1246        this->setstate(ios_base::failbit);
1247}
1248
1249template <class _CharT, class _Traits>
1250void
1251basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1252{
1253    if (__sb_.open(__s, __mode | ios_base::out))
1254        this->clear();
1255    else
1256        this->setstate(ios_base::failbit);
1257}
1258
1259template <class _CharT, class _Traits>
1260inline _LIBCPP_INLINE_VISIBILITY
1261void
1262basic_ofstream<_CharT, _Traits>::close()
1263{
1264    if (__sb_.close() == 0)
1265        this->setstate(ios_base::failbit);
1266}
1267
1268// basic_fstream
1269
1270template <class _CharT, class _Traits>
1271class _LIBCPP_VISIBLE basic_fstream
1272    : public basic_iostream<_CharT, _Traits>
1273{
1274public:
1275    typedef _CharT                         char_type;
1276    typedef _Traits                        traits_type;
1277    typedef typename traits_type::int_type int_type;
1278    typedef typename traits_type::pos_type pos_type;
1279    typedef typename traits_type::off_type off_type;
1280
1281    basic_fstream();
1282    explicit basic_fstream(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1283    explicit basic_fstream(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1284#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1285    basic_fstream(basic_fstream&& __rhs);
1286#endif
1287
1288#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1289    basic_fstream& operator=(basic_fstream&& __rhs);
1290#endif
1291    void swap(basic_fstream& __rhs);
1292
1293    basic_filebuf<char_type, traits_type>* rdbuf() const;
1294    bool is_open() const;
1295    void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1296    void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1297    void close();
1298
1299private:
1300    basic_filebuf<char_type, traits_type> __sb_;
1301};
1302
1303template <class _CharT, class _Traits>
1304inline _LIBCPP_INLINE_VISIBILITY
1305basic_fstream<_CharT, _Traits>::basic_fstream()
1306    : basic_iostream<char_type, traits_type>(&__sb_)
1307{
1308}
1309
1310template <class _CharT, class _Traits>
1311inline _LIBCPP_INLINE_VISIBILITY
1312basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
1313    : basic_iostream<char_type, traits_type>(&__sb_)
1314{
1315    if (__sb_.open(__s, __mode) == 0)
1316        this->setstate(ios_base::failbit);
1317}
1318
1319template <class _CharT, class _Traits>
1320inline _LIBCPP_INLINE_VISIBILITY
1321basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
1322    : basic_iostream<char_type, traits_type>(&__sb_)
1323{
1324    if (__sb_.open(__s, __mode) == 0)
1325        this->setstate(ios_base::failbit);
1326}
1327
1328#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1329
1330template <class _CharT, class _Traits>
1331inline _LIBCPP_INLINE_VISIBILITY
1332basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
1333    : basic_iostream<char_type, traits_type>(_VSTD::move(__rhs)),
1334      __sb_(_VSTD::move(__rhs.__sb_))
1335{
1336    this->set_rdbuf(&__sb_);
1337}
1338
1339template <class _CharT, class _Traits>
1340inline _LIBCPP_INLINE_VISIBILITY
1341basic_fstream<_CharT, _Traits>&
1342basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs)
1343{
1344    basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1345    __sb_ = _VSTD::move(__rhs.__sb_);
1346    return *this;
1347}
1348
1349#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1350
1351template <class _CharT, class _Traits>
1352inline _LIBCPP_INLINE_VISIBILITY
1353void
1354basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs)
1355{
1356    basic_iostream<char_type, traits_type>::swap(__rhs);
1357    __sb_.swap(__rhs.__sb_);
1358}
1359
1360template <class _CharT, class _Traits>
1361inline _LIBCPP_INLINE_VISIBILITY
1362void
1363swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y)
1364{
1365    __x.swap(__y);
1366}
1367
1368template <class _CharT, class _Traits>
1369inline _LIBCPP_INLINE_VISIBILITY
1370basic_filebuf<_CharT, _Traits>*
1371basic_fstream<_CharT, _Traits>::rdbuf() const
1372{
1373    return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1374}
1375
1376template <class _CharT, class _Traits>
1377inline _LIBCPP_INLINE_VISIBILITY
1378bool
1379basic_fstream<_CharT, _Traits>::is_open() const
1380{
1381    return __sb_.is_open();
1382}
1383
1384template <class _CharT, class _Traits>
1385void
1386basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1387{
1388    if (__sb_.open(__s, __mode))
1389        this->clear();
1390    else
1391        this->setstate(ios_base::failbit);
1392}
1393
1394template <class _CharT, class _Traits>
1395void
1396basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1397{
1398    if (__sb_.open(__s, __mode))
1399        this->clear();
1400    else
1401        this->setstate(ios_base::failbit);
1402}
1403
1404template <class _CharT, class _Traits>
1405inline _LIBCPP_INLINE_VISIBILITY
1406void
1407basic_fstream<_CharT, _Traits>::close()
1408{
1409    if (__sb_.close() == 0)
1410        this->setstate(ios_base::failbit);
1411}
1412
1413_LIBCPP_END_NAMESPACE_STD
1414
1415#endif  // _LIBCPP_FSTREAM
1416