external/bsd/libc++/dist/libcxx/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_ONLY 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 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
 210     basic_filebuf* open(const char* __s, ios_base::openmode __mode);
 211     basic_filebuf* open(const string& __s, ios_base::openmode __mode);
 212 #endif
 213     basic_filebuf* close();
 214
 215 protected:
 216     // 27.9.1.5 Overridden virtual functions:
 217     virtual int_type underflow();
 218     virtual int_type pbackfail(int_type __c = traits_type::eof());
 219     virtual int_type overflow (int_type __c = traits_type::eof());
 220     virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n);
 221     virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
 222                              ios_base::openmode __wch = ios_base::in | ios_base::out);
 223     virtual pos_type seekpos(pos_type __sp,
 224                              ios_base::openmode __wch = ios_base::in | ios_base::out);
 225     virtual int sync();
 226     virtual void imbue(const locale& __loc);
 227
 228 private:
 229     char*       __extbuf_;
 230     const char* __extbufnext_;
 231     const char* __extbufend_;
 232     char __extbuf_min_[8];
 233     size_t __ebs_;
 234     char_type* __intbuf_;
 235     size_t __ibs_;
 236     FILE* __file_;
 237     const codecvt<char_type, char, state_type>* __cv_;
 238     state_type __st_;
 239     state_type __st_last_;
 240     ios_base::openmode __om_;
 241     ios_base::openmode __cm_;
 242     bool __owns_eb_;
 243     bool __owns_ib_;
 244     bool __always_noconv_;
 245
 246     bool __read_mode();
 247     void __write_mode();
 248 };
 249
 250 template <class _CharT, class _Traits>
 251 basic_filebuf<_CharT, _Traits>::basic_filebuf()
 252     : __extbuf_(0),
 253       __extbufnext_(0),
 254       __extbufend_(0),
 255       __ebs_(0),
 256       __intbuf_(0),
 257       __ibs_(0),
 258       __file_(0),
 259       __cv_(nullptr),
 260       __st_(),
 261       __st_last_(),
 262       __om_(0),
 263       __cm_(0),
 264       __owns_eb_(false),
 265       __owns_ib_(false),
 266       __always_noconv_(false)
 267 {
 268     if (has_facet<codecvt<char_type, char, state_type> >(this->getloc()))
 269     {
 270         __cv_ = &use_facet<codecvt<char_type, char, state_type> >(this->getloc());
 271         __always_noconv_ = __cv_->always_noconv();
 272     }
 273     setbuf(0, 4096);
 274 }
 275
 276 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 277
 278 template <class _CharT, class _Traits>
 279 basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs)
 280     : basic_streambuf<_CharT, _Traits>(__rhs)
 281 {
 282     if (__rhs.__extbuf_ == __rhs.__extbuf_min_)
 283     {
 284         __extbuf_ = __extbuf_min_;
 285         __extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_);
 286         __extbufend_ = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_);
 287     }
 288     else
 289     {
 290         __extbuf_ = __rhs.__extbuf_;
 291         __extbufnext_ = __rhs.__extbufnext_;
 292         __extbufend_ = __rhs.__extbufend_;
 293     }
 294     __ebs_ = __rhs.__ebs_;
 295     __intbuf_ = __rhs.__intbuf_;
 296     __ibs_ = __rhs.__ibs_;
 297     __file_ = __rhs.__file_;
 298     __cv_ = __rhs.__cv_;
 299     __st_ = __rhs.__st_;
 300     __st_last_ = __rhs.__st_last_;
 301     __om_ = __rhs.__om_;
 302     __cm_ = __rhs.__cm_;
 303     __owns_eb_ = __rhs.__owns_eb_;
 304     __owns_ib_ = __rhs.__owns_ib_;
 305     __always_noconv_ = __rhs.__always_noconv_;
 306     if (__rhs.pbase())
 307     {
 308         if (__rhs.pbase() == __rhs.__intbuf_)
 309             this->setp(__intbuf_, __intbuf_ + (__rhs. epptr() - __rhs.pbase()));
 310         else
 311             this->setp((char_type*)__extbuf_,
 312                        (char_type*)__extbuf_ + (__rhs. epptr() - __rhs.pbase()));
 313         this->pbump(__rhs. pptr() - __rhs.pbase());
 314     }
 315     else if (__rhs.eback())
 316     {
 317         if (__rhs.eback() == __rhs.__intbuf_)
 318             this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()),
 319                                   __intbuf_ + (__rhs.egptr() - __rhs.eback()));
 320         else
 321             this->setg((char_type*)__extbuf_,
 322                        (char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()),
 323                        (char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback()));
 324     }
 325     __rhs.__extbuf_ = 0;
 326     __rhs.__extbufnext_ = 0;
 327     __rhs.__extbufend_ = 0;
 328     __rhs.__ebs_ = 0;
 329     __rhs.__intbuf_ = 0;
 330     __rhs.__ibs_ = 0;
 331     __rhs.__file_ = 0;
 332     __rhs.__st_ = state_type();
 333     __rhs.__st_last_ = state_type();
 334     __rhs.__om_ = 0;
 335     __rhs.__cm_ = 0;
 336     __rhs.__owns_eb_ = false;
 337     __rhs.__owns_ib_ = false;
 338     __rhs.setg(0, 0, 0);
 339     __rhs.setp(0, 0);
 340 }
 341
 342 template <class _CharT, class _Traits>
 343 inline _LIBCPP_INLINE_VISIBILITY
 344 basic_filebuf<_CharT, _Traits>&
 345 basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs)
 346 {
 347     close();
 348     swap(__rhs);
 349     return *this;
 350 }
 351
 352 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 353
 354 template <class _CharT, class _Traits>
 355 basic_filebuf<_CharT, _Traits>::~basic_filebuf()
 356 {
 357 #ifndef _LIBCPP_NO_EXCEPTIONS
 358     try
 359     {
 360 #endif  // _LIBCPP_NO_EXCEPTIONS
 361         close();
 362 #ifndef _LIBCPP_NO_EXCEPTIONS
 363     }
 364     catch (...)
 365     {
 366     }
 367 #endif  // _LIBCPP_NO_EXCEPTIONS
 368     if (__owns_eb_)
 369         delete [] __extbuf_;
 370     if (__owns_ib_)
 371         delete [] __intbuf_;
 372 }
 373
 374 template <class _CharT, class _Traits>
 375 void
 376 basic_filebuf<_CharT, _Traits>::swap(basic_filebuf& __rhs)
 377 {
 378     basic_streambuf<char_type, traits_type>::swap(__rhs);
 379     if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
 380     {
 381         _VSTD::swap(__extbuf_, __rhs.__extbuf_);
 382         _VSTD::swap(__extbufnext_, __rhs.__extbufnext_);
 383         _VSTD::swap(__extbufend_, __rhs.__extbufend_);
 384     }
 385     else
 386     {
 387         ptrdiff_t __ln = __extbufnext_ - __extbuf_;
 388         ptrdiff_t __le = __extbufend_ - __extbuf_;
 389         ptrdiff_t __rn = __rhs.__extbufnext_ - __rhs.__extbuf_;
 390         ptrdiff_t __re = __rhs.__extbufend_ - __rhs.__extbuf_;
 391         if (__extbuf_ == __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
 392         {
 393             __extbuf_ = __rhs.__extbuf_;
 394             __rhs.__extbuf_ = __rhs.__extbuf_min_;
 395         }
 396         else if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ == __rhs.__extbuf_min_)
 397         {
 398             __rhs.__extbuf_ = __extbuf_;
 399             __extbuf_ = __extbuf_min_;
 400         }
 401         __extbufnext_ = __extbuf_ + __rn;
 402         __extbufend_ = __extbuf_ + __re;
 403         __rhs.__extbufnext_ = __rhs.__extbuf_ + __ln;
 404         __rhs.__extbufend_ = __rhs.__extbuf_ + __le;
 405     }
 406     _VSTD::swap(__ebs_, __rhs.__ebs_);
 407     _VSTD::swap(__intbuf_, __rhs.__intbuf_);
 408     _VSTD::swap(__ibs_, __rhs.__ibs_);
 409     _VSTD::swap(__file_, __rhs.__file_);
 410     _VSTD::swap(__cv_, __rhs.__cv_);
 411     _VSTD::swap(__st_, __rhs.__st_);
 412     _VSTD::swap(__st_last_, __rhs.__st_last_);
 413     _VSTD::swap(__om_, __rhs.__om_);
 414     _VSTD::swap(__cm_, __rhs.__cm_);
 415     _VSTD::swap(__owns_eb_, __rhs.__owns_eb_);
 416     _VSTD::swap(__owns_ib_, __rhs.__owns_ib_);
 417     _VSTD::swap(__always_noconv_, __rhs.__always_noconv_);
 418     if (this->eback() == (char_type*)__rhs.__extbuf_min_)
 419     {
 420         ptrdiff_t __n = this->gptr() - this->eback();
 421         ptrdiff_t __e = this->egptr() - this->eback();
 422         this->setg((char_type*)__extbuf_min_,
 423                    (char_type*)__extbuf_min_ + __n,
 424                    (char_type*)__extbuf_min_ + __e);
 425     }
 426     else if (this->pbase() == (char_type*)__rhs.__extbuf_min_)
 427     {
 428         ptrdiff_t __n = this->pptr() - this->pbase();
 429         ptrdiff_t __e = this->epptr() - this->pbase();
 430         this->setp((char_type*)__extbuf_min_,
 431                    (char_type*)__extbuf_min_ + __e);
 432         this->pbump(__n);
 433     }
 434     if (__rhs.eback() == (char_type*)__extbuf_min_)
 435     {
 436         ptrdiff_t __n = __rhs.gptr() - __rhs.eback();
 437         ptrdiff_t __e = __rhs.egptr() - __rhs.eback();
 438         __rhs.setg((char_type*)__rhs.__extbuf_min_,
 439                    (char_type*)__rhs.__extbuf_min_ + __n,
 440                    (char_type*)__rhs.__extbuf_min_ + __e);
 441     }
 442     else if (__rhs.pbase() == (char_type*)__extbuf_min_)
 443     {
 444         ptrdiff_t __n = __rhs.pptr() - __rhs.pbase();
 445         ptrdiff_t __e = __rhs.epptr() - __rhs.pbase();
 446         __rhs.setp((char_type*)__rhs.__extbuf_min_,
 447                    (char_type*)__rhs.__extbuf_min_ + __e);
 448         __rhs.pbump(__n);
 449     }
 450 }
 451
 452 template <class _CharT, class _Traits>
 453 inline _LIBCPP_INLINE_VISIBILITY
 454 void
 455 swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y)
 456 {
 457     __x.swap(__y);
 458 }
 459
 460 template <class _CharT, class _Traits>
 461 inline _LIBCPP_INLINE_VISIBILITY
 462 bool
 463 basic_filebuf<_CharT, _Traits>::is_open() const
 464 {
 465     return __file_ != 0;
 466 }
 467
 468 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
 469 template <class _CharT, class _Traits>
 470 basic_filebuf<_CharT, _Traits>*
 471 basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
 472 {
 473     basic_filebuf<_CharT, _Traits>* __rt = 0;
 474     if (__file_ == 0)
 475     {
 476         __rt = this;
 477         const char* __mdstr;
 478         switch (__mode & ~ios_base::ate)
 479         {
 480         case ios_base::out:
 481         case ios_base::out | ios_base::trunc:
 482             __mdstr = "w";
 483             break;
 484         case ios_base::out | ios_base::app:
 485         case ios_base::app:
 486             __mdstr = "a";
 487             break;
 488         case ios_base::in:
 489             __mdstr = "r";
 490             break;
 491         case ios_base::in | ios_base::out:
 492             __mdstr = "r+";
 493             break;
 494         case ios_base::in | ios_base::out | ios_base::trunc:
 495             __mdstr = "w+";
 496             break;
 497         case ios_base::in | ios_base::out | ios_base::app:
 498         case ios_base::in | ios_base::app:
 499             __mdstr = "a+";
 500             break;
 501         case ios_base::out | ios_base::binary:
 502         case ios_base::out | ios_base::trunc | ios_base::binary:
 503             __mdstr = "wb";
 504             break;
 505         case ios_base::out | ios_base::app | ios_base::binary:
 506         case ios_base::app | ios_base::binary:
 507             __mdstr = "ab";
 508             break;
 509         case ios_base::in | ios_base::binary:
 510             __mdstr = "rb";
 511             break;
 512         case ios_base::in | ios_base::out | ios_base::binary:
 513             __mdstr = "r+b";
 514             break;
 515         case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
 516             __mdstr = "w+b";
 517             break;
 518         case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
 519         case ios_base::in | ios_base::app | ios_base::binary:
 520             __mdstr = "a+b";
 521             break;
 522         default:
 523             __rt = 0;
 524             break;
 525         }
 526         if (__rt)
 527         {
 528             __file_ = fopen(__s, __mdstr);
 529             if (__file_)
 530             {
 531                 __om_ = __mode;
 532                 if (__mode & ios_base::ate)
 533                 {
 534                     if (fseek(__file_, 0, SEEK_END))
 535                     {
 536                         fclose(__file_);
 537                         __file_ = 0;
 538                         __rt = 0;
 539                     }
 540                 }
 541             }
 542             else
 543                 __rt = 0;
 544         }
 545     }
 546     return __rt;
 547 }
 548
 549 template <class _CharT, class _Traits>
 550 inline _LIBCPP_INLINE_VISIBILITY
 551 basic_filebuf<_CharT, _Traits>*
 552 basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
 553 {
 554     return open(__s.c_str(), __mode);
 555 }
 556 #endif
 557
 558 template <class _CharT, class _Traits>
 559 basic_filebuf<_CharT, _Traits>*
 560 basic_filebuf<_CharT, _Traits>::close()
 561 {
 562     basic_filebuf<_CharT, _Traits>* __rt = 0;
 563     if (__file_)
 564     {
 565         __rt = this;
 566         unique_ptr<FILE, int(*)(FILE*)> __h(__file_, fclose);
 567         if (sync())
 568             __rt = 0;
 569         if (fclose(__h.release()) == 0)
 570             __file_ = 0;
 571         else
 572             __rt = 0;
 573     }
 574     return __rt;
 575 }
 576
 577 template <class _CharT, class _Traits>
 578 typename basic_filebuf<_CharT, _Traits>::int_type
 579 basic_filebuf<_CharT, _Traits>::underflow()
 580 {
 581     if (__file_ == 0)
 582         return traits_type::eof();
 583     bool __initial = __read_mode();
 584     char_type __1buf;
 585     if (this->gptr() == 0)
 586         this->setg(&__1buf, &__1buf+1, &__1buf+1);
 587     const size_t __unget_sz = __initial ? 0 : min<size_t>((this->egptr() - this->eback()) / 2, 4);
 588     int_type __c = traits_type::eof();
 589     if (this->gptr() == this->egptr())
 590     {
 591         memmove(this->eback(), this->egptr() - __unget_sz, __unget_sz * sizeof(char_type));
 592         if (__always_noconv_)
 593         {
 594             size_t __nmemb = static_cast<size_t>(this->egptr() - this->eback() - __unget_sz);
 595             __nmemb = fread(this->eback() + __unget_sz, 1, __nmemb, __file_);
 596             if (__nmemb != 0)
 597             {
 598                 this->setg(this->eback(),
 599                            this->eback() + __unget_sz,
 600                            this->eback() + __unget_sz + __nmemb);
 601                 __c = traits_type::to_int_type(*this->gptr());
 602             }
 603         }
 604         else
 605         {
 606             memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
 607             __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
 608             __extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
 609             size_t __nmemb = _VSTD::min(static_cast<size_t>(__ibs_ - __unget_sz),
 610                                  static_cast<size_t>(__extbufend_ - __extbufnext_));
 611             codecvt_base::result __r;
 612             __st_last_ = __st_;
 613             size_t __nr = fread((void*)__extbufnext_, 1, __nmemb, __file_);
 614             if (__nr != 0)
 615             {
 616 #ifndef _LIBCPP_NO_EXCEPTIONS
 617                 if (!__cv_)
 618                     throw bad_cast();
 619 #endif
 620                 __extbufend_ = __extbufnext_ + __nr;
 621                 char_type*  __inext;
 622                 __r = __cv_->in(__st_, __extbuf_, __extbufend_, __extbufnext_,
 623                                        this->eback() + __unget_sz,
 624                                        this->eback() + __ibs_, __inext);
 625                 if (__r == codecvt_base::noconv)
 626                 {
 627                     this->setg((char_type*)__extbuf_, (char_type*)__extbuf_, (char_type*)__extbufend_);
 628                     __c = traits_type::to_int_type(*this->gptr());
 629                 }
 630                 else if (__inext != this->eback() + __unget_sz)
 631                 {
 632                     this->setg(this->eback(), this->eback() + __unget_sz, __inext);
 633                     __c = traits_type::to_int_type(*this->gptr());
 634                 }
 635             }
 636         }
 637     }
 638     else
 639         __c = traits_type::to_int_type(*this->gptr());
 640     if (this->eback() == &__1buf)
 641         this->setg(0, 0, 0);
 642     return __c;
 643 }
 644
 645 template <class _CharT, class _Traits>
 646 typename basic_filebuf<_CharT, _Traits>::int_type
 647 basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c)
 648 {
 649     if (__file_ && this->eback() < this->gptr())
 650     {
 651         if (traits_type::eq_int_type(__c, traits_type::eof()))
 652         {
 653             this->gbump(-1);
 654             return traits_type::not_eof(__c);
 655         }
 656         if ((__om_ & ios_base::out) ||
 657             traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
 658         {
 659             this->gbump(-1);
 660             *this->gptr() = traits_type::to_char_type(__c);
 661             return __c;
 662         }
 663     }
 664     return traits_type::eof();
 665 }
 666
 667 template <class _CharT, class _Traits>
 668 typename basic_filebuf<_CharT, _Traits>::int_type
 669 basic_filebuf<_CharT, _Traits>::overflow(int_type __c)
 670 {
 671     if (__file_ == 0)
 672         return traits_type::eof();
 673     __write_mode();
 674     char_type __1buf;
 675     char_type* __pb_save = this->pbase();
 676     char_type* __epb_save = this->epptr();
 677     if (!traits_type::eq_int_type(__c, traits_type::eof()))
 678     {
 679         if (this->pptr() == 0)
 680             this->setp(&__1buf, &__1buf+1);
 681         *this->pptr() = traits_type::to_char_type(__c);
 682         this->pbump(1);
 683     }
 684     if (this->pptr() != this->pbase())
 685     {
 686         if (__always_noconv_)
 687         {
 688             size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
 689             if (fwrite(this->pbase(), sizeof(char_type), __nmemb, __file_) != __nmemb)
 690                 return traits_type::eof();
 691         }
 692         else
 693         {
 694             char* __extbe = __extbuf_;
 695             codecvt_base::result __r;
 696             do
 697             {
 698 #ifndef _LIBCPP_NO_EXCEPTIONS
 699                 if (!__cv_)
 700                     throw bad_cast();
 701 #endif
 702                 const char_type* __e;
 703                 __r = __cv_->out(__st_, this->pbase(), this->pptr(), __e,
 704                                         __extbuf_, __extbuf_ + __ebs_, __extbe);
 705                 if (__e == this->pbase())
 706                     return traits_type::eof();
 707                 if (__r == codecvt_base::noconv)
 708                 {
 709                     size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
 710                     if (fwrite(this->pbase(), 1, __nmemb, __file_) != __nmemb)
 711                         return traits_type::eof();
 712                 }
 713                 else if (__r == codecvt_base::ok || __r == codecvt_base::partial)
 714                 {
 715                     size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
 716                     if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
 717                         return traits_type::eof();
 718                     if (__r == codecvt_base::partial)
 719                     {
 720                         this->setp((char_type*)__e, this->pptr());
 721                         this->pbump(this->epptr() - this->pbase());
 722                     }
 723                 }
 724                 else
 725                     return traits_type::eof();
 726             } while (__r == codecvt_base::partial);
 727         }
 728         this->setp(__pb_save, __epb_save);
 729     }
 730     return traits_type::not_eof(__c);
 731 }
 732
 733 template <class _CharT, class _Traits>
 734 basic_streambuf<_CharT, _Traits>*
 735 basic_filebuf<_CharT, _Traits>::setbuf(char_type* __s, streamsize __n)
 736 {
 737     this->setg(0, 0, 0);
 738     this->setp(0, 0);
 739     if (__owns_eb_)
 740         delete [] __extbuf_;
 741     if (__owns_ib_)
 742         delete [] __intbuf_;
 743     __ebs_ = __n;
 744     if (__ebs_ > sizeof(__extbuf_min_))
 745     {
 746         if (__always_noconv_ && __s)
 747         {
 748             __extbuf_ = (char*)__s;
 749             __owns_eb_ = false;
 750         }
 751         else
 752         {
 753             __extbuf_ = new char[__ebs_];
 754             __owns_eb_ = true;
 755         }
 756     }
 757     else
 758     {
 759         __extbuf_ = __extbuf_min_;
 760         __ebs_ = sizeof(__extbuf_min_);
 761         __owns_eb_ = false;
 762     }
 763     if (!__always_noconv_)
 764     {
 765         __ibs_ = max<streamsize>(__n, sizeof(__extbuf_min_));
 766         if (__s && __ibs_ >= sizeof(__extbuf_min_))
 767         {
 768             __intbuf_ = __s;
 769             __owns_ib_ = false;
 770         }
 771         else
 772         {
 773             __intbuf_ = new char_type[__ibs_];
 774             __owns_ib_ = true;
 775         }
 776     }
 777     else
 778     {
 779         __ibs_ = 0;
 780         __intbuf_ = 0;
 781         __owns_ib_ = false;
 782     }
 783     return this;
 784 }
 785
 786 template <class _CharT, class _Traits>
 787 typename basic_filebuf<_CharT, _Traits>::pos_type
 788 basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way,
 789                                         ios_base::openmode)
 790 {
 791 #ifndef _LIBCPP_NO_EXCEPTIONS
 792     if (!__cv_)
 793         throw bad_cast();
 794 #endif
 795     int __width = __cv_->encoding();
 796     if (__file_ == 0 || (__width <= 0 && __off != 0) || sync())
 797         return pos_type(off_type(-1));
 798     // __width > 0 || __off == 0
 799     int __whence;
 800     switch (__way)
 801     {
 802     case ios_base::beg:
 803         __whence = SEEK_SET;
 804         break;
 805     case ios_base::cur:
 806         __whence = SEEK_CUR;
 807         break;
 808     case ios_base::end:
 809         __whence = SEEK_END;
 810         break;
 811     default:
 812         return pos_type(off_type(-1));
 813     }
 814 #if defined(_WIN32) || defined(_NEWLIB_VERSION)
 815     if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
 816         return pos_type(off_type(-1));
 817     pos_type __r = ftell(__file_);
 818 #else
 819     if (fseeko(__file_, __width > 0 ? __width * __off : 0, __whence))
 820         return pos_type(off_type(-1));
 821     pos_type __r = ftello(__file_);
 822 #endif
 823     __r.state(__st_);
 824     return __r;
 825 }
 826
 827 template <class _CharT, class _Traits>
 828 typename basic_filebuf<_CharT, _Traits>::pos_type
 829 basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode)
 830 {
 831     if (__file_ == 0 || sync())
 832         return pos_type(off_type(-1));
 833 #if defined(_WIN32) || defined(_NEWLIB_VERSION)
 834     if (fseek(__file_, __sp, SEEK_SET))
 835         return pos_type(off_type(-1));
 836 #else
 837     if (fseeko(__file_, __sp, SEEK_SET))
 838         return pos_type(off_type(-1));
 839 #endif
 840     __st_ = __sp.state();
 841     return __sp;
 842 }
 843
 844 template <class _CharT, class _Traits>
 845 int
 846 basic_filebuf<_CharT, _Traits>::sync()
 847 {
 848     if (__file_ == 0)
 849         return 0;
 850 #ifndef _LIBCPP_NO_EXCEPTIONS
 851     if (!__cv_)
 852         throw bad_cast();
 853 #endif
 854     if (__cm_ & ios_base::out)
 855     {
 856         if (this->pptr() != this->pbase())
 857             if (overflow() == traits_type::eof())
 858                 return -1;
 859         codecvt_base::result __r;
 860         do
 861         {
 862             char* __extbe;
 863             __r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
 864             size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
 865             if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
 866                 return -1;
 867         } while (__r == codecvt_base::partial);
 868         if (__r == codecvt_base::error)
 869             return -1;
 870         if (fflush(__file_))
 871             return -1;
 872     }
 873     else if (__cm_ & ios_base::in)
 874     {
 875         off_type __c;
 876         state_type __state = __st_last_;
 877         bool __update_st = false;
 878         if (__always_noconv_)
 879             __c = this->egptr() - this->gptr();
 880         else
 881         {
 882             int __width = __cv_->encoding();
 883             __c = __extbufend_ - __extbufnext_;
 884             if (__width > 0)
 885                 __c += __width * (this->egptr() - this->gptr());
 886             else
 887             {
 888                 if (this->gptr() != this->egptr())
 889                 {
 890                     const int __off =  __cv_->length(__state, __extbuf_,
 891                                                      __extbufnext_,
 892                                                      this->gptr() - this->eback());
 893                     __c += __extbufnext_ - __extbuf_ - __off;
 894                     __update_st = true;
 895                 }
 896             }
 897         }
 898 #if defined(_WIN32) || defined(_NEWLIB_VERSION)
 899         if (fseek(__file_, -__c, SEEK_CUR))
 900             return -1;
 901 #else
 902         if (fseeko(__file_, -__c, SEEK_CUR))
 903             return -1;
 904 #endif
 905         if (__update_st)
 906             __st_ = __state;
 907         __extbufnext_ = __extbufend_ = __extbuf_;
 908         this->setg(0, 0, 0);
 909         __cm_ = 0;
 910     }
 911     return 0;
 912 }
 913
 914 template <class _CharT, class _Traits>
 915 void
 916 basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc)
 917 {
 918     sync();
 919     __cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
 920     bool __old_anc = __always_noconv_;
 921     __always_noconv_ = __cv_->always_noconv();
 922     if (__old_anc != __always_noconv_)
 923     {
 924         this->setg(0, 0, 0);
 925         this->setp(0, 0);
 926         // invariant, char_type is char, else we couldn't get here
 927         if (__always_noconv_)  // need to dump __intbuf_
 928         {
 929             if (__owns_eb_)
 930                 delete [] __extbuf_;
 931             __owns_eb_ = __owns_ib_;
 932             __ebs_ = __ibs_;
 933             __extbuf_ = (char*)__intbuf_;
 934             __ibs_ = 0;
 935             __intbuf_ = 0;
 936             __owns_ib_ = false;
 937         }
 938         else  // need to obtain an __intbuf_.
 939         {     // If __extbuf_ is user-supplied, use it, else new __intbuf_
 940             if (!__owns_eb_ && __extbuf_ != __extbuf_min_)
 941             {
 942                 __ibs_ = __ebs_;
 943                 __intbuf_ = (char_type*)__extbuf_;
 944                 __owns_ib_ = false;
 945                 __extbuf_ = new char[__ebs_];
 946                 __owns_eb_ = true;
 947             }
 948             else
 949             {
 950                 __ibs_ = __ebs_;
 951                 __intbuf_ = new char_type[__ibs_];
 952                 __owns_ib_ = true;
 953             }
 954         }
 955     }
 956 }
 957
 958 template <class _CharT, class _Traits>
 959 bool
 960 basic_filebuf<_CharT, _Traits>::__read_mode()
 961 {
 962     if (!(__cm_ & ios_base::in))
 963     {
 964         this->setp(0, 0);
 965         if (__always_noconv_)
 966             this->setg((char_type*)__extbuf_,
 967                        (char_type*)__extbuf_ + __ebs_,
 968                        (char_type*)__extbuf_ + __ebs_);
 969         else
 970             this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_);
 971         __cm_ = ios_base::in;
 972         return true;
 973     }
 974     return false;
 975 }
 976
 977 template <class _CharT, class _Traits>
 978 void
 979 basic_filebuf<_CharT, _Traits>::__write_mode()
 980 {
 981     if (!(__cm_ & ios_base::out))
 982     {
 983         this->setg(0, 0, 0);
 984         if (__ebs_ > sizeof(__extbuf_min_))
 985         {
 986             if (__always_noconv_)
 987                 this->setp((char_type*)__extbuf_,
 988                            (char_type*)__extbuf_ + (__ebs_ - 1));
 989             else
 990                 this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1));
 991         }
 992         else
 993             this->setp(0, 0);
 994         __cm_ = ios_base::out;
 995     }
 996 }
 997
 998 // basic_ifstream
 999
1000 template <class _CharT, class _Traits>
1001 class _LIBCPP_TYPE_VIS_ONLY basic_ifstream
1002     : public basic_istream<_CharT, _Traits>
1003 {
1004 public:
1005     typedef _CharT                         char_type;
1006     typedef _Traits                        traits_type;
1007     typedef typename traits_type::int_type int_type;
1008     typedef typename traits_type::pos_type pos_type;
1009     typedef typename traits_type::off_type off_type;
1010
1011     basic_ifstream();
1012 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1013     explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
1014     explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
1015 #endif
1016 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1017     basic_ifstream(basic_ifstream&& __rhs);
1018 #endif
1019
1020 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1021     basic_ifstream& operator=(basic_ifstream&& __rhs);
1022 #endif
1023     void swap(basic_ifstream& __rhs);
1024
1025     basic_filebuf<char_type, traits_type>* rdbuf() const;
1026     bool is_open() const;
1027 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1028     void open(const char* __s, ios_base::openmode __mode = ios_base::in);
1029     void open(const string& __s, ios_base::openmode __mode = ios_base::in);
1030 #endif
1031     void close();
1032
1033 private:
1034     basic_filebuf<char_type, traits_type> __sb_;
1035 };
1036
1037 template <class _CharT, class _Traits>
1038 inline _LIBCPP_INLINE_VISIBILITY
1039 basic_ifstream<_CharT, _Traits>::basic_ifstream()
1040     : basic_istream<char_type, traits_type>(&__sb_)
1041 {
1042 }
1043
1044 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1045 template <class _CharT, class _Traits>
1046 inline _LIBCPP_INLINE_VISIBILITY
1047 basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __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 template <class _CharT, class _Traits>
1055 inline _LIBCPP_INLINE_VISIBILITY
1056 basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
1057     : basic_istream<char_type, traits_type>(&__sb_)
1058 {
1059     if (__sb_.open(__s, __mode | ios_base::in) == 0)
1060         this->setstate(ios_base::failbit);
1061 }
1062 #endif
1063
1064 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1065
1066 template <class _CharT, class _Traits>
1067 inline _LIBCPP_INLINE_VISIBILITY
1068 basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
1069     : basic_istream<char_type, traits_type>(_VSTD::move(__rhs)),
1070       __sb_(_VSTD::move(__rhs.__sb_))
1071 {
1072     this->set_rdbuf(&__sb_);
1073 }
1074
1075 template <class _CharT, class _Traits>
1076 inline _LIBCPP_INLINE_VISIBILITY
1077 basic_ifstream<_CharT, _Traits>&
1078 basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs)
1079 {
1080     basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1081     __sb_ = _VSTD::move(__rhs.__sb_);
1082     return *this;
1083 }
1084
1085 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1086
1087 template <class _CharT, class _Traits>
1088 inline _LIBCPP_INLINE_VISIBILITY
1089 void
1090 basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs)
1091 {
1092     basic_istream<char_type, traits_type>::swap(__rhs);
1093     __sb_.swap(__rhs.__sb_);
1094 }
1095
1096 template <class _CharT, class _Traits>
1097 inline _LIBCPP_INLINE_VISIBILITY
1098 void
1099 swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y)
1100 {
1101     __x.swap(__y);
1102 }
1103
1104 template <class _CharT, class _Traits>
1105 inline _LIBCPP_INLINE_VISIBILITY
1106 basic_filebuf<_CharT, _Traits>*
1107 basic_ifstream<_CharT, _Traits>::rdbuf() const
1108 {
1109     return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1110 }
1111
1112 template <class _CharT, class _Traits>
1113 inline _LIBCPP_INLINE_VISIBILITY
1114 bool
1115 basic_ifstream<_CharT, _Traits>::is_open() const
1116 {
1117     return __sb_.is_open();
1118 }
1119
1120 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1121 template <class _CharT, class _Traits>
1122 void
1123 basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1124 {
1125     if (__sb_.open(__s, __mode | ios_base::in))
1126         this->clear();
1127     else
1128         this->setstate(ios_base::failbit);
1129 }
1130
1131 template <class _CharT, class _Traits>
1132 void
1133 basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1134 {
1135     if (__sb_.open(__s, __mode | ios_base::in))
1136         this->clear();
1137     else
1138         this->setstate(ios_base::failbit);
1139 }
1140 #endif
1141
1142 template <class _CharT, class _Traits>
1143 inline _LIBCPP_INLINE_VISIBILITY
1144 void
1145 basic_ifstream<_CharT, _Traits>::close()
1146 {
1147     if (__sb_.close() == 0)
1148         this->setstate(ios_base::failbit);
1149 }
1150
1151 // basic_ofstream
1152
1153 template <class _CharT, class _Traits>
1154 class _LIBCPP_TYPE_VIS_ONLY basic_ofstream
1155     : public basic_ostream<_CharT, _Traits>
1156 {
1157 public:
1158     typedef _CharT                         char_type;
1159     typedef _Traits                        traits_type;
1160     typedef typename traits_type::int_type int_type;
1161     typedef typename traits_type::pos_type pos_type;
1162     typedef typename traits_type::off_type off_type;
1163
1164     basic_ofstream();
1165     explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
1166     explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
1167 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1168     basic_ofstream(basic_ofstream&& __rhs);
1169 #endif
1170
1171 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1172     basic_ofstream& operator=(basic_ofstream&& __rhs);
1173 #endif
1174     void swap(basic_ofstream& __rhs);
1175
1176     basic_filebuf<char_type, traits_type>* rdbuf() const;
1177     bool is_open() const;
1178 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1179     void open(const char* __s, ios_base::openmode __mode = ios_base::out);
1180     void open(const string& __s, ios_base::openmode __mode = ios_base::out);
1181 #endif
1182     void close();
1183
1184 private:
1185     basic_filebuf<char_type, traits_type> __sb_;
1186 };
1187
1188 template <class _CharT, class _Traits>
1189 inline _LIBCPP_INLINE_VISIBILITY
1190 basic_ofstream<_CharT, _Traits>::basic_ofstream()
1191     : basic_ostream<char_type, traits_type>(&__sb_)
1192 {
1193 }
1194
1195 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1196 template <class _CharT, class _Traits>
1197 inline _LIBCPP_INLINE_VISIBILITY
1198 basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
1199     : basic_ostream<char_type, traits_type>(&__sb_)
1200 {
1201     if (__sb_.open(__s, __mode | ios_base::out) == 0)
1202         this->setstate(ios_base::failbit);
1203 }
1204
1205 template <class _CharT, class _Traits>
1206 inline _LIBCPP_INLINE_VISIBILITY
1207 basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
1208     : basic_ostream<char_type, traits_type>(&__sb_)
1209 {
1210     if (__sb_.open(__s, __mode | ios_base::out) == 0)
1211         this->setstate(ios_base::failbit);
1212 }
1213 #endif
1214
1215 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1216
1217 template <class _CharT, class _Traits>
1218 inline _LIBCPP_INLINE_VISIBILITY
1219 basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
1220     : basic_ostream<char_type, traits_type>(_VSTD::move(__rhs)),
1221       __sb_(_VSTD::move(__rhs.__sb_))
1222 {
1223     this->set_rdbuf(&__sb_);
1224 }
1225
1226 template <class _CharT, class _Traits>
1227 inline _LIBCPP_INLINE_VISIBILITY
1228 basic_ofstream<_CharT, _Traits>&
1229 basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs)
1230 {
1231     basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1232     __sb_ = _VSTD::move(__rhs.__sb_);
1233     return *this;
1234 }
1235
1236 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1237
1238 template <class _CharT, class _Traits>
1239 inline _LIBCPP_INLINE_VISIBILITY
1240 void
1241 basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs)
1242 {
1243     basic_ostream<char_type, traits_type>::swap(__rhs);
1244     __sb_.swap(__rhs.__sb_);
1245 }
1246
1247 template <class _CharT, class _Traits>
1248 inline _LIBCPP_INLINE_VISIBILITY
1249 void
1250 swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y)
1251 {
1252     __x.swap(__y);
1253 }
1254
1255 template <class _CharT, class _Traits>
1256 inline _LIBCPP_INLINE_VISIBILITY
1257 basic_filebuf<_CharT, _Traits>*
1258 basic_ofstream<_CharT, _Traits>::rdbuf() const
1259 {
1260     return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1261 }
1262
1263 template <class _CharT, class _Traits>
1264 inline _LIBCPP_INLINE_VISIBILITY
1265 bool
1266 basic_ofstream<_CharT, _Traits>::is_open() const
1267 {
1268     return __sb_.is_open();
1269 }
1270
1271 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1272 template <class _CharT, class _Traits>
1273 void
1274 basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1275 {
1276     if (__sb_.open(__s, __mode | ios_base::out))
1277         this->clear();
1278     else
1279         this->setstate(ios_base::failbit);
1280 }
1281
1282 template <class _CharT, class _Traits>
1283 void
1284 basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1285 {
1286     if (__sb_.open(__s, __mode | ios_base::out))
1287         this->clear();
1288     else
1289         this->setstate(ios_base::failbit);
1290 }
1291 #endif
1292
1293 template <class _CharT, class _Traits>
1294 inline _LIBCPP_INLINE_VISIBILITY
1295 void
1296 basic_ofstream<_CharT, _Traits>::close()
1297 {
1298     if (__sb_.close() == 0)
1299         this->setstate(ios_base::failbit);
1300 }
1301
1302 // basic_fstream
1303
1304 template <class _CharT, class _Traits>
1305 class _LIBCPP_TYPE_VIS_ONLY basic_fstream
1306     : public basic_iostream<_CharT, _Traits>
1307 {
1308 public:
1309     typedef _CharT                         char_type;
1310     typedef _Traits                        traits_type;
1311     typedef typename traits_type::int_type int_type;
1312     typedef typename traits_type::pos_type pos_type;
1313     typedef typename traits_type::off_type off_type;
1314
1315     basic_fstream();
1316 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1317     explicit basic_fstream(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1318     explicit basic_fstream(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1319 #endif
1320 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1321     basic_fstream(basic_fstream&& __rhs);
1322 #endif
1323
1324 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1325     basic_fstream& operator=(basic_fstream&& __rhs);
1326 #endif
1327     void swap(basic_fstream& __rhs);
1328
1329     basic_filebuf<char_type, traits_type>* rdbuf() const;
1330     bool is_open() const;
1331 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1332     void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1333     void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
1334 #endif
1335     void close();
1336
1337 private:
1338     basic_filebuf<char_type, traits_type> __sb_;
1339 };
1340
1341 template <class _CharT, class _Traits>
1342 inline _LIBCPP_INLINE_VISIBILITY
1343 basic_fstream<_CharT, _Traits>::basic_fstream()
1344     : basic_iostream<char_type, traits_type>(&__sb_)
1345 {
1346 }
1347
1348 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1349 template <class _CharT, class _Traits>
1350 inline _LIBCPP_INLINE_VISIBILITY
1351 basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
1352     : basic_iostream<char_type, traits_type>(&__sb_)
1353 {
1354     if (__sb_.open(__s, __mode) == 0)
1355         this->setstate(ios_base::failbit);
1356 }
1357
1358 template <class _CharT, class _Traits>
1359 inline _LIBCPP_INLINE_VISIBILITY
1360 basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
1361     : basic_iostream<char_type, traits_type>(&__sb_)
1362 {
1363     if (__sb_.open(__s, __mode) == 0)
1364         this->setstate(ios_base::failbit);
1365 }
1366 #endif
1367
1368 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1369
1370 template <class _CharT, class _Traits>
1371 inline _LIBCPP_INLINE_VISIBILITY
1372 basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
1373     : basic_iostream<char_type, traits_type>(_VSTD::move(__rhs)),
1374       __sb_(_VSTD::move(__rhs.__sb_))
1375 {
1376     this->set_rdbuf(&__sb_);
1377 }
1378
1379 template <class _CharT, class _Traits>
1380 inline _LIBCPP_INLINE_VISIBILITY
1381 basic_fstream<_CharT, _Traits>&
1382 basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs)
1383 {
1384     basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1385     __sb_ = _VSTD::move(__rhs.__sb_);
1386     return *this;
1387 }
1388
1389 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1390
1391 template <class _CharT, class _Traits>
1392 inline _LIBCPP_INLINE_VISIBILITY
1393 void
1394 basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs)
1395 {
1396     basic_iostream<char_type, traits_type>::swap(__rhs);
1397     __sb_.swap(__rhs.__sb_);
1398 }
1399
1400 template <class _CharT, class _Traits>
1401 inline _LIBCPP_INLINE_VISIBILITY
1402 void
1403 swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y)
1404 {
1405     __x.swap(__y);
1406 }
1407
1408 template <class _CharT, class _Traits>
1409 inline _LIBCPP_INLINE_VISIBILITY
1410 basic_filebuf<_CharT, _Traits>*
1411 basic_fstream<_CharT, _Traits>::rdbuf() const
1412 {
1413     return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
1414 }
1415
1416 template <class _CharT, class _Traits>
1417 inline _LIBCPP_INLINE_VISIBILITY
1418 bool
1419 basic_fstream<_CharT, _Traits>::is_open() const
1420 {
1421     return __sb_.is_open();
1422 }
1423
1424 #ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
1425 template <class _CharT, class _Traits>
1426 void
1427 basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
1428 {
1429     if (__sb_.open(__s, __mode))
1430         this->clear();
1431     else
1432         this->setstate(ios_base::failbit);
1433 }
1434
1435 template <class _CharT, class _Traits>
1436 void
1437 basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
1438 {
1439     if (__sb_.open(__s, __mode))
1440         this->clear();
1441     else
1442         this->setstate(ios_base::failbit);
1443 }
1444 #endif
1445
1446 template <class _CharT, class _Traits>
1447 inline _LIBCPP_INLINE_VISIBILITY
1448 void
1449 basic_fstream<_CharT, _Traits>::close()
1450 {
1451     if (__sb_.close() == 0)
1452         this->setstate(ios_base::failbit);
1453 }
1454
1455 _LIBCPP_END_NAMESPACE_STD
1456
1457 #endif  // _LIBCPP_FSTREAM