contrib/libc++/include/fstream

   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
  17 template <class charT, class traits = char_traits<charT> >
  18 class basic_filebuf
  19     : public basic_streambuf<charT, traits>
  20 {
  21 public:
  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
  43 protected:
  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
  59 template <class charT, class traits>
  60   void
  61   swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y);
  62
  63 typedef basic_filebuf<char>    filebuf;
  64 typedef basic_filebuf<wchar_t> wfilebuf;
  65
  66 template <class charT, class traits = char_traits<charT> >
  67 class basic_ifstream
  68     : public basic_istream<charT,traits>
  69 {
  70 public:
  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
  92 template <class charT, class traits>
  93   void
  94   swap(basic_ifstream<charT, traits>& x, basic_ifstream<charT, traits>& y);
  95
  96 typedef basic_ifstream<char>    ifstream;
  97 typedef basic_ifstream<wchar_t> wifstream;
  98
  99 template <class charT, class traits = char_traits<charT> >
 100 class basic_ofstream
 101     : public basic_ostream<charT,traits>
 102 {
 103 public:
 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
 125 template <class charT, class traits>
 126   void
 127   swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);
 128
 129 typedef basic_ofstream<char>    ofstream;
 130 typedef basic_ofstream<wchar_t> wofstream;
 131
 132 template <class charT, class traits=char_traits<charT> >
 133 class basic_fstream
 134     : public basic_iostream<charT,traits>
 135 {
 136 public:
 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
 158 template <class charT, class traits>
 159   void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y);
 160
 161 typedef basic_fstream<char>    fstream;
 162 typedef 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
 182 template <class _CharT, class _Traits>
 183 class _LIBCPP_TYPE_VIS basic_filebuf
 184     : public basic_streambuf<_CharT, _Traits>
 185 {
 186 public:
 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
 213 protected:
 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
 226 private:
 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
 248 template <class _CharT, class _Traits>
 249 basic_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
 276 template <class _CharT, class _Traits>
 277 basic_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
 340 template <class _CharT, class _Traits>
 341 inline _LIBCPP_INLINE_VISIBILITY
 342 basic_filebuf<_CharT, _Traits>&
 343 basic_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
 352 template <class _CharT, class _Traits>
 353 basic_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
 372 template <class _CharT, class _Traits>
 373 void
 374 basic_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
 450 template <class _CharT, class _Traits>
 451 inline _LIBCPP_INLINE_VISIBILITY
 452 void
 453 swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y)
 454 {
 455     __x.swap(__y);
 456 }
 457
 458 template <class _CharT, class _Traits>
 459 inline _LIBCPP_INLINE_VISIBILITY
 460 bool
 461 basic_filebuf<_CharT, _Traits>::is_open() const
 462 {
 463     return __file_ != 0;
 464 }
 465
 466 template <class _CharT, class _Traits>
 467 basic_filebuf<_CharT, _Traits>*
 468 basic_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
 546 template <class _CharT, class _Traits>
 547 inline _LIBCPP_INLINE_VISIBILITY
 548 basic_filebuf<_CharT, _Traits>*
 549 basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
 550 {
 551     return open(__s.c_str(), __mode);
 552 }
 553
 554 template <class _CharT, class _Traits>
 555 basic_filebuf<_CharT, _Traits>*
 556 basic_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
 573 template <class _CharT, class _Traits>
 574 typename basic_filebuf<_CharT, _Traits>::int_type
 575 basic_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
 641 template <class _CharT, class _Traits>
 642 typename basic_filebuf<_CharT, _Traits>::int_type
 643 basic_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
 663 template <class _CharT, class _Traits>
 664 typename basic_filebuf<_CharT, _Traits>::int_type
 665 basic_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
 729 template <class _CharT, class _Traits>
 730 basic_streambuf<_CharT, _Traits>*
 731 basic_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
 782 template <class _CharT, class _Traits>
 783 typename basic_filebuf<_CharT, _Traits>::pos_type
 784 basic_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 _WIN32
 811     if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
 812         return pos_type(off_type(-1));
 813     pos_type __r = ftell(__file_);
 814 #else
 815     if (fseeko(__file_, __width > 0 ? __width * __off : 0, __whence))
 816         return pos_type(off_type(-1));
 817     pos_type __r = ftello(__file_);
 818 #endif
 819     __r.state(__st_);
 820     return __r;
 821 }
 822
 823 template <class _CharT, class _Traits>
 824 typename basic_filebuf<_CharT, _Traits>::pos_type
 825 basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode)
 826 {
 827     if (__file_ == 0 || sync())
 828         return pos_type(off_type(-1));
 829 #if _WIN32
 830     if (fseek(__file_, __sp, SEEK_SET))
 831         return pos_type(off_type(-1));
 832 #else
 833     if (fseeko(__file_, __sp, SEEK_SET))
 834         return pos_type(off_type(-1));
 835 #endif
 836     __st_ = __sp.state();
 837     return __sp;
 838 }
 839
 840 template <class _CharT, class _Traits>
 841 int
 842 basic_filebuf<_CharT, _Traits>::sync()
 843 {
 844     if (__file_ == 0)
 845         return 0;
 846 #ifndef _LIBCPP_NO_EXCEPTIONS
 847     if (!__cv_)
 848         throw bad_cast();
 849 #endif
 850     if (__cm_ & ios_base::out)
 851     {
 852         if (this->pptr() != this->pbase())
 853             if (overflow() == traits_type::eof())
 854                 return -1;
 855         codecvt_base::result __r;
 856         do
 857         {
 858             char* __extbe;
 859             __r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
 860             size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
 861             if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
 862                 return -1;
 863         } while (__r == codecvt_base::partial);
 864         if (__r == codecvt_base::error)
 865             return -1;
 866         if (fflush(__file_))
 867             return -1;
 868     }
 869     else if (__cm_ & ios_base::in)
 870     {
 871         off_type __c;
 872         state_type __state = __st_last_;
 873         bool __update_st = false;
 874         if (__always_noconv_)
 875             __c = this->egptr() - this->gptr();
 876         else
 877         {
 878             int __width = __cv_->encoding();
 879             __c = __extbufend_ - __extbufnext_;
 880             if (__width > 0)
 881                 __c += __width * (this->egptr() - this->gptr());
 882             else
 883             {
 884                 if (this->gptr() != this->egptr())
 885                 {
 886                     const int __off =  __cv_->length(__state, __extbuf_,
 887                                                      __extbufnext_,
 888                                                      this->gptr() - this->eback());
 889                     __c += __extbufnext_ - __extbuf_ - __off;
 890                     __update_st = true;
 891                 }
 892             }
 893         }
 894 #if _WIN32
 895         if (fseek(__file_, -__c, SEEK_CUR))
 896             return -1;
 897 #else
 898         if (fseeko(__file_, -__c, SEEK_CUR))
 899             return -1;
 900 #endif
 901         if (__update_st)
 902             __st_ = __state;
 903         __extbufnext_ = __extbufend_ = __extbuf_;
 904         this->setg(0, 0, 0);
 905         __cm_ = 0;
 906     }
 907     return 0;
 908 }
 909
 910 template <class _CharT, class _Traits>
 911 void
 912 basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc)
 913 {
 914     sync();
 915     __cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
 916     bool __old_anc = __always_noconv_;
 917     __always_noconv_ = __cv_->always_noconv();
 918     if (__old_anc != __always_noconv_)
 919     {
 920         this->setg(0, 0, 0);
 921         this->setp(0, 0);
 922         // invariant, char_type is char, else we couldn't get here
 923         if (__always_noconv_)  // need to dump __intbuf_
 924         {
 925             if (__owns_eb_)
 926                 delete [] __extbuf_;
 927             __owns_eb_ = __owns_ib_;
 928             __ebs_ = __ibs_;
 929             __extbuf_ = (char*)__intbuf_;
 930             __ibs_ = 0;
 931             __intbuf_ = 0;
 932             __owns_ib_ = false;
 933         }
 934         else  // need to obtain an __intbuf_.
 935         {     // If __extbuf_ is user-supplied, use it, else new __intbuf_
 936             if (!__owns_eb_ && __extbuf_ != __extbuf_min_)
 937             {
 938                 __ibs_ = __ebs_;
 939                 __intbuf_ = (char_type*)__extbuf_;
 940                 __owns_ib_ = false;
 941                 __extbuf_ = new char[__ebs_];
 942                 __owns_eb_ = true;
 943             }
 944             else
 945             {
 946                 __ibs_ = __ebs_;
 947                 __intbuf_ = new char_type[__ibs_];
 948                 __owns_ib_ = true;
 949             }
 950         }
 951     }
 952 }
 953
 954 template <class _CharT, class _Traits>
 955 bool
 956 basic_filebuf<_CharT, _Traits>::__read_mode()
 957 {
 958     if (!(__cm_ & ios_base::in))
 959     {
 960         this->setp(0, 0);
 961         if (__always_noconv_)
 962             this->setg((char_type*)__extbuf_,
 963                        (char_type*)__extbuf_ + __ebs_,
 964                        (char_type*)__extbuf_ + __ebs_);
 965         else
 966             this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_);
 967         __cm_ = ios_base::in;
 968         return true;
 969     }
 970     return false;
 971 }
 972
 973 template <class _CharT, class _Traits>
 974 void
 975 basic_filebuf<_CharT, _Traits>::__write_mode()
 976 {
 977     if (!(__cm_ & ios_base::out))
 978     {
 979         this->setg(0, 0, 0);
 980         if (__ebs_ > sizeof(__extbuf_min_))
 981         {
 982             if (__always_noconv_)
 983                 this->setp((char_type*)__extbuf_,
 984                            (char_type*)__extbuf_ + (__ebs_ - 1));
 985             else
 986                 this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1));
 987         }
 988         else
 989             this->setp(0, 0);
 990         __cm_ = ios_base::out;
 991     }
 992 }
 993
 994 // basic_ifstream
 995
 996 template <class _CharT, class _Traits>
 997 class _LIBCPP_TYPE_VIS basic_ifstream
 998     : public basic_istream<_CharT, _Traits>
 999 {
1000 public:
1001     typedef _CharT                         char_type;
1002     typedef _Traits                        traits_type;
1003     typedef typename traits_type::int_type int_type;
1004     typedef typename traits_type::pos_type pos_type;
1005     typedef typename traits_type::off_type off_type;
1006
1007     basic_ifstream();
1008     explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
1009     explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
1010 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1011     basic_ifstream(basic_ifstream&& __rhs);
1012 #endif
1013
1014 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1015     basic_ifstream& operator=(basic_ifstream&& __rhs);
1016 #endif
1017     void swap(basic_ifstream& __rhs);
1018
1019     basic_filebuf<char_type, traits_type>* rdbuf() const;
1020     bool is_open() const;
1021     void open(const char* __s, ios_base::openmode __mode = ios_base::in);
1022     void open(const string& __s, ios_base::openmode __mode = ios_base::in);
1023     void close();
1024
1025 private:
1026     basic_filebuf<char_type, traits_type> __sb_;
1027 };
1028
1029 template <class _CharT, class _Traits>
1030 inline _LIBCPP_INLINE_VISIBILITY
1031 basic_ifstream<_CharT, _Traits>::basic_ifstream()
1032     : basic_istream<char_type, traits_type>(&__sb_)
1033 {
1034 }
1035
1036 template <class _CharT, class _Traits>
1037 inline _LIBCPP_INLINE_VISIBILITY
1038 basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode)
1039     : basic_istream<char_type, traits_type>(&__sb_)
1040 {
1041     if (__sb_.open(__s, __mode | ios_base::in) == 0)
1042         this->setstate(ios_base::failbit);
1043 }
1044
1045 template <class _CharT, class _Traits>
1046 inline _LIBCPP_INLINE_VISIBILITY
1047 basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
1048     : basic_istream<char_type, traits_type>(&__sb_)
1049 {
1050     if (__sb_.open(__s, __mode | ios_base::in) == 0)
1051         this->setstate(ios_base::failbit);
1052 }
1053
1054 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1055
1056 template <class _CharT, class _Traits>
1057 inline _LIBCPP_INLINE_VISIBILITY
1058 basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
1059     : basic_istream<char_type, traits_type>(_VSTD::move(__rhs)),
1060       __sb_(_VSTD::move(__rhs.__sb_))
1061 {
1062     this->set_rdbuf(&__sb_);
1063 }
1064
1065 template <class _CharT, class _Traits>
1066 inline _LIBCPP_INLINE_VISIBILITY
1067 basic_ifstream<_CharT, _Traits>&
1068 basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs)
1069 {
1070     basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1071     __sb_ = _VSTD::move(__rhs.__sb_);
1072     return *this;
1073 }
1074
1075 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1076
1077 template <class _CharT, class _Traits>
1078 inline _LIBCPP_INLINE_VISIBILITY
1079 void
1080 basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs)
1081 {
1082     basic_istream<char_type, traits_type>::swap(__rhs);
1083     __sb_.swap(__rhs.__sb_);
1084 }
1085
1086 template <class _CharT, class _Traits>
1087 inline _LIBCPP_INLINE_VISIBILITY
1088 void
1089 swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y)
1090 {
1091     __x.swap(__y);
1092 }
1093
1094 template <class _CharT, class _Traits>
1095 inline _LIBCPP_INLINE_VISIBILITY
1096 basic_filebuf<_CharT, _Traits>*
1097 basic_ifstream<_CharT, _Traits>::rdbuf() const
1098 {
1099     return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1100 }
1101
1102 template <class _CharT, class _Traits>
1103 inline _LIBCPP_INLINE_VISIBILITY
1104 bool
1105 basic_ifstream<_CharT, _Traits>::is_open() const
1106 {
1107     return __sb_.is_open();
1108 }
1109
1110 template <class _CharT, class _Traits>
1111 void
1112 basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1113 {
1114     if (__sb_.open(__s, __mode | ios_base::in))
1115         this->clear();
1116     else
1117         this->setstate(ios_base::failbit);
1118 }
1119
1120 template <class _CharT, class _Traits>
1121 void
1122 basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1123 {
1124     if (__sb_.open(__s, __mode | ios_base::in))
1125         this->clear();
1126     else
1127         this->setstate(ios_base::failbit);
1128 }
1129
1130 template <class _CharT, class _Traits>
1131 inline _LIBCPP_INLINE_VISIBILITY
1132 void
1133 basic_ifstream<_CharT, _Traits>::close()
1134 {
1135     if (__sb_.close() == 0)
1136         this->setstate(ios_base::failbit);
1137 }
1138
1139 // basic_ofstream
1140
1141 template <class _CharT, class _Traits>
1142 class _LIBCPP_TYPE_VIS basic_ofstream
1143     : public basic_ostream<_CharT, _Traits>
1144 {
1145 public:
1146     typedef _CharT                         char_type;
1147     typedef _Traits                        traits_type;
1148     typedef typename traits_type::int_type int_type;
1149     typedef typename traits_type::pos_type pos_type;
1150     typedef typename traits_type::off_type off_type;
1151
1152     basic_ofstream();
1153     explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
1154     explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
1155 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1156     basic_ofstream(basic_ofstream&& __rhs);
1157 #endif
1158
1159 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1160     basic_ofstream& operator=(basic_ofstream&& __rhs);
1161 #endif
1162     void swap(basic_ofstream& __rhs);
1163
1164     basic_filebuf<char_type, traits_type>* rdbuf() const;
1165     bool is_open() const;
1166     void open(const char* __s, ios_base::openmode __mode = ios_base::out);
1167     void open(const string& __s, ios_base::openmode __mode = ios_base::out);
1168     void close();
1169
1170 private:
1171     basic_filebuf<char_type, traits_type> __sb_;
1172 };
1173
1174 template <class _CharT, class _Traits>
1175 inline _LIBCPP_INLINE_VISIBILITY
1176 basic_ofstream<_CharT, _Traits>::basic_ofstream()
1177     : basic_ostream<char_type, traits_type>(&__sb_)
1178 {
1179 }
1180
1181 template <class _CharT, class _Traits>
1182 inline _LIBCPP_INLINE_VISIBILITY
1183 basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
1184     : basic_ostream<char_type, traits_type>(&__sb_)
1185 {
1186     if (__sb_.open(__s, __mode | ios_base::out) == 0)
1187         this->setstate(ios_base::failbit);
1188 }
1189
1190 template <class _CharT, class _Traits>
1191 inline _LIBCPP_INLINE_VISIBILITY
1192 basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
1193     : basic_ostream<char_type, traits_type>(&__sb_)
1194 {
1195     if (__sb_.open(__s, __mode | ios_base::out) == 0)
1196         this->setstate(ios_base::failbit);
1197 }
1198
1199 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1200
1201 template <class _CharT, class _Traits>
1202 inline _LIBCPP_INLINE_VISIBILITY
1203 basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
1204     : basic_ostream<char_type, traits_type>(_VSTD::move(__rhs)),
1205       __sb_(_VSTD::move(__rhs.__sb_))
1206 {
1207     this->set_rdbuf(&__sb_);
1208 }
1209
1210 template <class _CharT, class _Traits>
1211 inline _LIBCPP_INLINE_VISIBILITY
1212 basic_ofstream<_CharT, _Traits>&
1213 basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs)
1214 {
1215     basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1216     __sb_ = _VSTD::move(__rhs.__sb_);
1217     return *this;
1218 }
1219
1220 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1221
1222 template <class _CharT, class _Traits>
1223 inline _LIBCPP_INLINE_VISIBILITY
1224 void
1225 basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs)
1226 {
1227     basic_ostream<char_type, traits_type>::swap(__rhs);
1228     __sb_.swap(__rhs.__sb_);
1229 }
1230
1231 template <class _CharT, class _Traits>
1232 inline _LIBCPP_INLINE_VISIBILITY
1233 void
1234 swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y)
1235 {
1236     __x.swap(__y);
1237 }
1238
1239 template <class _CharT, class _Traits>
1240 inline _LIBCPP_INLINE_VISIBILITY
1241 basic_filebuf<_CharT, _Traits>*
1242 basic_ofstream<_CharT, _Traits>::rdbuf() const
1243 {
1244     return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1245 }
1246
1247 template <class _CharT, class _Traits>
1248 inline _LIBCPP_INLINE_VISIBILITY
1249 bool
1250 basic_ofstream<_CharT, _Traits>::is_open() const
1251 {
1252     return __sb_.is_open();
1253 }
1254
1255 template <class _CharT, class _Traits>
1256 void
1257 basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1258 {
1259     if (__sb_.open(__s, __mode | ios_base::out))
1260         this->clear();
1261     else
1262         this->setstate(ios_base::failbit);
1263 }
1264
1265 template <class _CharT, class _Traits>
1266 void
1267 basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1268 {
1269     if (__sb_.open(__s, __mode | ios_base::out))
1270         this->clear();
1271     else
1272         this->setstate(ios_base::failbit);
1273 }
1274
1275 template <class _CharT, class _Traits>
1276 inline _LIBCPP_INLINE_VISIBILITY
1277 void
1278 basic_ofstream<_CharT, _Traits>::close()
1279 {
1280     if (__sb_.close() == 0)
1281         this->setstate(ios_base::failbit);
1282 }
1283
1284 // basic_fstream
1285
1286 template <class _CharT, class _Traits>
1287 class _LIBCPP_TYPE_VIS basic_fstream
1288     : public basic_iostream<_CharT, _Traits>
1289 {
1290 public:
1291     typedef _CharT                         char_type;
1292     typedef _Traits                        traits_type;
1293     typedef typename traits_type::int_type int_type;
1294     typedef typename traits_type::pos_type pos_type;
1295     typedef typename traits_type::off_type off_type;
1296
1297     basic_fstream();
1298     explicit basic_fstream(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1299     explicit basic_fstream(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1300 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1301     basic_fstream(basic_fstream&& __rhs);
1302 #endif
1303
1304 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1305     basic_fstream& operator=(basic_fstream&& __rhs);
1306 #endif
1307     void swap(basic_fstream& __rhs);
1308
1309     basic_filebuf<char_type, traits_type>* rdbuf() const;
1310     bool is_open() const;
1311     void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1312     void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1313     void close();
1314
1315 private:
1316     basic_filebuf<char_type, traits_type> __sb_;
1317 };
1318
1319 template <class _CharT, class _Traits>
1320 inline _LIBCPP_INLINE_VISIBILITY
1321 basic_fstream<_CharT, _Traits>::basic_fstream()
1322     : basic_iostream<char_type, traits_type>(&__sb_)
1323 {
1324 }
1325
1326 template <class _CharT, class _Traits>
1327 inline _LIBCPP_INLINE_VISIBILITY
1328 basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
1329     : basic_iostream<char_type, traits_type>(&__sb_)
1330 {
1331     if (__sb_.open(__s, __mode) == 0)
1332         this->setstate(ios_base::failbit);
1333 }
1334
1335 template <class _CharT, class _Traits>
1336 inline _LIBCPP_INLINE_VISIBILITY
1337 basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
1338     : basic_iostream<char_type, traits_type>(&__sb_)
1339 {
1340     if (__sb_.open(__s, __mode) == 0)
1341         this->setstate(ios_base::failbit);
1342 }
1343
1344 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1345
1346 template <class _CharT, class _Traits>
1347 inline _LIBCPP_INLINE_VISIBILITY
1348 basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
1349     : basic_iostream<char_type, traits_type>(_VSTD::move(__rhs)),
1350       __sb_(_VSTD::move(__rhs.__sb_))
1351 {
1352     this->set_rdbuf(&__sb_);
1353 }
1354
1355 template <class _CharT, class _Traits>
1356 inline _LIBCPP_INLINE_VISIBILITY
1357 basic_fstream<_CharT, _Traits>&
1358 basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs)
1359 {
1360     basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1361     __sb_ = _VSTD::move(__rhs.__sb_);
1362     return *this;
1363 }
1364
1365 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1366
1367 template <class _CharT, class _Traits>
1368 inline _LIBCPP_INLINE_VISIBILITY
1369 void
1370 basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs)
1371 {
1372     basic_iostream<char_type, traits_type>::swap(__rhs);
1373     __sb_.swap(__rhs.__sb_);
1374 }
1375
1376 template <class _CharT, class _Traits>
1377 inline _LIBCPP_INLINE_VISIBILITY
1378 void
1379 swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y)
1380 {
1381     __x.swap(__y);
1382 }
1383
1384 template <class _CharT, class _Traits>
1385 inline _LIBCPP_INLINE_VISIBILITY
1386 basic_filebuf<_CharT, _Traits>*
1387 basic_fstream<_CharT, _Traits>::rdbuf() const
1388 {
1389     return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1390 }
1391
1392 template <class _CharT, class _Traits>
1393 inline _LIBCPP_INLINE_VISIBILITY
1394 bool
1395 basic_fstream<_CharT, _Traits>::is_open() const
1396 {
1397     return __sb_.is_open();
1398 }
1399
1400 template <class _CharT, class _Traits>
1401 void
1402 basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1403 {
1404     if (__sb_.open(__s, __mode))
1405         this->clear();
1406     else
1407         this->setstate(ios_base::failbit);
1408 }
1409
1410 template <class _CharT, class _Traits>
1411 void
1412 basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1413 {
1414     if (__sb_.open(__s, __mode))
1415         this->clear();
1416     else
1417         this->setstate(ios_base::failbit);
1418 }
1419
1420 template <class _CharT, class _Traits>
1421 inline _LIBCPP_INLINE_VISIBILITY
1422 void
1423 basic_fstream<_CharT, _Traits>::close()
1424 {
1425     if (__sb_.close() == 0)
1426         this->setstate(ios_base::failbit);
1427 }
1428
1429 _LIBCPP_END_NAMESPACE_STD
1430
1431 #endif  // _LIBCPP_FSTREAM