1 // File based streams -*- C++ -*- 2 3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 2, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // You should have received a copy of the GNU General Public License along 18 // with this library; see the file COPYING. If not, write to the Free 19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 20 // USA. 21 22 // As a special exception, you may use this file as part of a free software 23 // library without restriction. Specifically, if other files instantiate 24 // templates or use macros or inline functions from this file, or you compile 25 // this file and link it with other files to produce an executable, this 26 // file does not by itself cause the resulting executable to be covered by 27 // the GNU General Public License. This exception does not however 28 // invalidate any other reasons why the executable file might be covered by 29 // the GNU General Public License. 30 31 // 32 // ISO C++ 14882: 27.8 File-based streams 33 // 34 35 /** @file fstream 36 * This is a Standard C++ Library header. You should @c #include this header 37 * in your programs, rather than any of the "st[dl]_*.h" implementation files. 38 */ 39 40 #ifndef _GLIBCXX_FSTREAM 41 #define _GLIBCXX_FSTREAM 1 42 43 #pragma GCC system_header 44 45 #include <istream> 46 #include <ostream> 47 #include <locale> // For codecvt 48 #include <cstdio> // For SEEK_SET, SEEK_CUR, SEEK_END, BUFSIZ 49 #include <bits/basic_file.h> 50 #include <bits/gthr.h> 51 52 namespace std 53 { 54 // [27.8.1.1] template class basic_filebuf 55 /** 56 * @brief The actual work of input and output (for files). 57 * 58 * This class associates both its input and output sequence with an 59 * external disk file, and maintains a joint file position for both 60 * sequences. Many of its sematics are described in terms of similar 61 * behavior in the Standard C Library's @c FILE streams. 62 */ 63 // Requirements on traits_type, specific to this class: 64 // traits_type::pos_type must be fpos<traits_type::state_type> 65 // traits_type::off_type must be streamoff 66 // traits_type::state_type must be Assignable and DefaultConstructable, 67 // and traits_type::state_type() must be the initial state for codecvt. 68 template<typename _CharT, typename _Traits> 69 class basic_filebuf : public basic_streambuf<_CharT, _Traits> 70 { 71 public: 72 // Types: 73 typedef _CharT char_type; 74 typedef _Traits traits_type; 75 typedef typename traits_type::int_type int_type; 76 typedef typename traits_type::pos_type pos_type; 77 typedef typename traits_type::off_type off_type; 78 79 //@{ 80 /** 81 * @if maint 82 * @doctodo 83 * @endif 84 */ 85 typedef basic_streambuf<char_type, traits_type> __streambuf_type; 86 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 87 typedef __basic_file<char> __file_type; 88 typedef typename traits_type::state_type __state_type; 89 typedef codecvt<char_type, char, __state_type> __codecvt_type; 90 //@} 91 92 friend class ios_base; // For sync_with_stdio. 93 94 protected: 95 // Data Members: 96 // MT lock inherited from libio or other low-level io library. 97 /** 98 * @if maint 99 * @doctodo 100 * @endif 101 */ 102 __c_lock _M_lock; 103 104 // External buffer. 105 /** 106 * @if maint 107 * @doctodo 108 * @endif 109 */ 110 __file_type _M_file; 111 112 /** 113 * @if maint 114 * Place to stash in || out || in | out settings for current filebuf. 115 * @endif 116 */ 117 ios_base::openmode _M_mode; 118 119 // Beginning state type for codecvt. 120 /** 121 * @if maint 122 * @doctodo 123 * @endif 124 */ 125 __state_type _M_state_beg; 126 127 // During output, the state that corresponds to pptr(), 128 // during input, the state that corresponds to egptr() and 129 // _M_ext_next. 130 /** 131 * @if maint 132 * @doctodo 133 * @endif 134 */ 135 __state_type _M_state_cur; 136 137 // Not used for output. During input, the state that corresponds 138 // to eback() and _M_ext_buf. 139 /** 140 * @if maint 141 * @doctodo 142 * @endif 143 */ 144 __state_type _M_state_last; 145 146 /** 147 * @if maint 148 * Pointer to the beginning of internal buffer. 149 * @endif 150 */ 151 char_type* _M_buf; 152 153 /** 154 * @if maint 155 * Actual size of internal buffer. This number is equal to the size 156 * of the put area + 1 position, reserved for the overflow char of 157 * a full area. 158 * @endif 159 */ 160 size_t _M_buf_size; 161 162 // Set iff _M_buf is allocated memory from _M_allocate_internal_buffer. 163 /** 164 * @if maint 165 * @doctodo 166 * @endif 167 */ 168 bool _M_buf_allocated; 169 170 /** 171 * @if maint 172 * _M_reading == false && _M_writing == false for 'uncommitted' mode; 173 * _M_reading == true for 'read' mode; 174 * _M_writing == true for 'write' mode; 175 * 176 * NB: _M_reading == true && _M_writing == true is unused. 177 * @endif 178 */ 179 bool _M_reading; 180 bool _M_writing; 181 182 //@{ 183 /** 184 * @if maint 185 * Necessary bits for putback buffer management. 186 * 187 * @note pbacks of over one character are not currently supported. 188 * @endif 189 */ 190 char_type _M_pback; 191 char_type* _M_pback_cur_save; 192 char_type* _M_pback_end_save; 193 bool _M_pback_init; 194 //@} 195 196 // Cached codecvt facet. 197 const __codecvt_type* _M_codecvt; 198 199 /** 200 * @if maint 201 * Buffer for external characters. Used for input when 202 * codecvt::always_noconv() == false. When valid, this corresponds 203 * to eback(). 204 * @endif 205 */ 206 char* _M_ext_buf; 207 208 /** 209 * @if maint 210 * Size of buffer held by _M_ext_buf. 211 * @endif 212 */ 213 streamsize _M_ext_buf_size; 214 215 /** 216 * @if maint 217 * Pointers into the buffer held by _M_ext_buf that delimit a 218 * subsequence of bytes that have been read but not yet converted. 219 * When valid, _M_ext_next corresponds to egptr(). 220 * @endif 221 */ 222 const char* _M_ext_next; 223 char* _M_ext_end; 224 225 /** 226 * @if maint 227 * Initializes pback buffers, and moves normal buffers to safety. 228 * Assumptions: 229 * _M_in_cur has already been moved back 230 * @endif 231 */ 232 void 233 _M_create_pback() 234 { 235 if (!_M_pback_init) 236 { 237 _M_pback_cur_save = this->gptr(); 238 _M_pback_end_save = this->egptr(); 239 this->setg(&_M_pback, &_M_pback, &_M_pback + 1); 240 _M_pback_init = true; 241 } 242 } 243 244 /** 245 * @if maint 246 * Deactivates pback buffer contents, and restores normal buffer. 247 * Assumptions: 248 * The pback buffer has only moved forward. 249 * @endif 250 */ 251 void 252 _M_destroy_pback() throw() 253 { 254 if (_M_pback_init) 255 { 256 // Length _M_in_cur moved in the pback buffer. 257 _M_pback_cur_save += this->gptr() != this->eback(); 258 this->setg(this->_M_buf, _M_pback_cur_save, _M_pback_end_save); 259 _M_pback_init = false; 260 } 261 } 262 263 public: 264 // Constructors/destructor: 265 /** 266 * @brief Does not open any files. 267 * 268 * The default constructor initializes the parent class using its 269 * own default ctor. 270 */ 271 basic_filebuf(); 272 273 /** 274 * @brief The destructor closes the file first. 275 */ 276 virtual 277 ~basic_filebuf() 278 { this->close(); } 279 280 // Members: 281 /** 282 * @brief Returns true if the external file is open. 283 */ 284 bool 285 is_open() const throw() { return _M_file.is_open(); } 286 287 /** 288 * @brief Opens an external file. 289 * @param s The name of the file. 290 * @param mode The open mode flags. 291 * @return @c this on success, NULL on failure 292 * 293 * If a file is already open, this function immediately fails. 294 * Otherwise it tries to open the file named @a s using the flags 295 * given in @a mode. 296 * 297 * [Table 92 gives the relation between openmode combinations and the 298 * equivalent fopen() flags, but the table has not been copied yet.] 299 */ 300 __filebuf_type* 301 open(const char* __s, ios_base::openmode __mode); 302 303 /** 304 * @brief Closes the currently associated file. 305 * @return @c this on success, NULL on failure 306 * 307 * If no file is currently open, this function immediately fails. 308 * 309 * If a "put buffer area" exists, @c overflow(eof) is called to flush 310 * all the characters. The file is then closed. 311 * 312 * If any operations fail, this function also fails. 313 */ 314 __filebuf_type* 315 close() throw(); 316 317 protected: 318 /** 319 * @if maint 320 * @doctodo 321 * @endif 322 */ 323 void 324 _M_allocate_internal_buffer(); 325 326 /** 327 * @if maint 328 * @doctodo 329 * @endif 330 */ 331 void 332 _M_destroy_internal_buffer() throw(); 333 334 // [27.8.1.4] overridden virtual functions 335 // [documentation is inherited] 336 virtual streamsize 337 showmanyc(); 338 339 // Stroustrup, 1998, p. 628 340 // underflow() and uflow() functions are called to get the next 341 // charater from the real input source when the buffer is empty. 342 // Buffered input uses underflow() 343 344 // [documentation is inherited] 345 virtual int_type 346 underflow(); 347 348 // [documentation is inherited] 349 virtual int_type 350 pbackfail(int_type __c = _Traits::eof()); 351 352 // Stroustrup, 1998, p 648 353 // The overflow() function is called to transfer characters to the 354 // real output destination when the buffer is full. A call to 355 // overflow(c) outputs the contents of the buffer plus the 356 // character c. 357 // 27.5.2.4.5 358 // Consume some sequence of the characters in the pending sequence. 359 /** 360 * @if maint 361 * @doctodo 362 * @endif 363 */ 364 virtual int_type 365 overflow(int_type __c = _Traits::eof()); 366 367 // Convert internal byte sequence to external, char-based 368 // sequence via codecvt. 369 /** 370 * @if maint 371 * @doctodo 372 * @endif 373 */ 374 bool 375 _M_convert_to_external(char_type*, streamsize); 376 377 /** 378 * @brief Manipulates the buffer. 379 * @param s Pointer to a buffer area. 380 * @param n Size of @a s. 381 * @return @c this 382 * 383 * If no file has been opened, and both @a s and @a n are zero, then 384 * the stream becomes unbuffered. Otherwise, @c s is used as a 385 * buffer; see 386 * http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2 387 * for more. 388 */ 389 virtual __streambuf_type* 390 setbuf(char_type* __s, streamsize __n); 391 392 // [documentation is inherited] 393 virtual pos_type 394 seekoff(off_type __off, ios_base::seekdir __way, 395 ios_base::openmode __mode = ios_base::in | ios_base::out); 396 397 // [documentation is inherited] 398 virtual pos_type 399 seekpos(pos_type __pos, 400 ios_base::openmode __mode = ios_base::in | ios_base::out); 401 402 // Common code for seekoff and seekpos 403 /** 404 * @if maint 405 * @doctodo 406 * @endif 407 */ 408 pos_type 409 _M_seek(off_type __off, ios_base::seekdir __way, __state_type __state); 410 411 // [documentation is inherited] 412 virtual int 413 sync(); 414 415 // [documentation is inherited] 416 virtual void 417 imbue(const locale& __loc); 418 419 // [documentation is inherited] 420 virtual streamsize 421 xsgetn(char_type* __s, streamsize __n) 422 { 423 // Clear out pback buffer before going on to the real deal... 424 streamsize __ret = 0; 425 if (this->_M_pback_init) 426 { 427 if (__n && this->gptr() == this->eback()) 428 { 429 *__s++ = *this->gptr(); 430 this->gbump(1); 431 __ret = 1; 432 } 433 _M_destroy_pback(); 434 } 435 if (__ret < __n) 436 __ret += __streambuf_type::xsgetn(__s, __n - __ret); 437 return __ret; 438 } 439 440 // [documentation is inherited] 441 virtual streamsize 442 xsputn(const char_type* __s, streamsize __n); 443 444 // Flushes output buffer, then writes unshift sequence. 445 /** 446 * @if maint 447 * @doctodo 448 * @endif 449 */ 450 bool 451 _M_terminate_output(); 452 453 /** 454 * @if maint 455 * This function sets the pointers of the internal buffer, both get 456 * and put areas. Typically: 457 * 458 * __off == egptr() - eback() upon underflow/uflow ('read' mode); 459 * __off == 0 upon overflow ('write' mode); 460 * __off == -1 upon open, setbuf, seekoff/pos ('uncommitted' mode). 461 * 462 * NB: epptr() - pbase() == _M_buf_size - 1, since _M_buf_size 463 * reflects the actual allocated memory and the last cell is reserved 464 * for the overflow char of a full put area. 465 * @endif 466 */ 467 void 468 _M_set_buffer(streamsize __off) 469 { 470 const bool __testin = this->_M_mode & ios_base::in; 471 const bool __testout = this->_M_mode & ios_base::out; 472 473 if (__testin && __off > 0) 474 this->setg(this->_M_buf, this->_M_buf, this->_M_buf + __off); 475 else 476 this->setg(this->_M_buf, this->_M_buf, this->_M_buf); 477 478 if (__testout && __off == 0 && this->_M_buf_size > 1 ) 479 this->setp(this->_M_buf, this->_M_buf + this->_M_buf_size - 1); 480 else 481 this->setp(NULL, NULL); 482 } 483 }; 484 485 // [27.8.1.5] Template class basic_ifstream 486 /** 487 * @brief Controlling input for files. 488 * 489 * This class supports reading from named files, using the inherited 490 * functions from std::basic_istream. To control the associated 491 * sequence, an instance of std::basic_filebuf is used, which this page 492 * refers to as @c sb. 493 */ 494 template<typename _CharT, typename _Traits> 495 class basic_ifstream : public basic_istream<_CharT, _Traits> 496 { 497 public: 498 // Types: 499 typedef _CharT char_type; 500 typedef _Traits traits_type; 501 typedef typename traits_type::int_type int_type; 502 typedef typename traits_type::pos_type pos_type; 503 typedef typename traits_type::off_type off_type; 504 505 // Non-standard types: 506 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 507 typedef basic_istream<char_type, traits_type> __istream_type; 508 509 private: 510 /** 511 * @if maint 512 * @doctodo 513 * @endif 514 */ 515 __filebuf_type _M_filebuf; 516 517 public: 518 // Constructors/Destructors: 519 /** 520 * @brief Default constructor. 521 * 522 * Initializes @c sb using its default constructor, and passes 523 * @c &sb to the base class initializer. Does not open any files 524 * (you haven't given it a filename to open). 525 */ 526 basic_ifstream() : __istream_type(), _M_filebuf() 527 { this->init(&_M_filebuf); } 528 529 /** 530 * @brief Create an input file stream. 531 * @param s Null terminated string specifying the filename. 532 * @param mode Open file in specified mode (see std::ios_base). 533 * 534 * @c ios_base::in is automatically included in @a mode. 535 * 536 * Tip: When using std::string to hold the filename, you must use 537 * .c_str() before passing it to this constructor. 538 */ 539 explicit 540 basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in) 541 : __istream_type(), _M_filebuf() 542 { 543 this->init(&_M_filebuf); 544 this->open(__s, __mode); 545 } 546 547 /** 548 * @brief The destructor does nothing. 549 * 550 * The file is closed by the filebuf object, not the formatting 551 * stream. 552 */ 553 ~basic_ifstream() 554 { } 555 556 // Members: 557 /** 558 * @brief Accessing the underlying buffer. 559 * @return The current basic_filebuf buffer. 560 * 561 * This hides both signatures of std::basic_ios::rdbuf(). 562 */ 563 __filebuf_type* 564 rdbuf() const 565 { return const_cast<__filebuf_type*>(&_M_filebuf); } 566 567 /** 568 * @brief Wrapper to test for an open file. 569 * @return @c rdbuf()->is_open() 570 */ 571 bool 572 is_open() { return _M_filebuf.is_open(); } 573 574 /** 575 * @brief Opens an external file. 576 * @param s The name of the file. 577 * @param mode The open mode flags. 578 * 579 * Calls @c std::basic_filebuf::open(s,mode|in). If that function 580 * fails, @c failbit is set in the stream's error state. 581 * 582 * Tip: When using std::string to hold the filename, you must use 583 * .c_str() before passing it to this constructor. 584 */ 585 void 586 open(const char* __s, ios_base::openmode __mode = ios_base::in) 587 { 588 if (!_M_filebuf.open(__s, __mode | ios_base::in)) 589 this->setstate(ios_base::failbit); 590 } 591 592 /** 593 * @brief Close the file. 594 * 595 * Calls @c std::basic_filebuf::close(). If that function 596 * fails, @c failbit is set in the stream's error state. 597 */ 598 void 599 close() 600 { 601 if (!_M_filebuf.close()) 602 this->setstate(ios_base::failbit); 603 } 604 }; 605 606 607 // [27.8.1.8] Template class basic_ofstream 608 /** 609 * @brief Controlling output for files. 610 * 611 * This class supports reading from named files, using the inherited 612 * functions from std::basic_ostream. To control the associated 613 * sequence, an instance of std::basic_filebuf is used, which this page 614 * refers to as @c sb. 615 */ 616 template<typename _CharT, typename _Traits> 617 class basic_ofstream : public basic_ostream<_CharT,_Traits> 618 { 619 public: 620 // Types: 621 typedef _CharT char_type; 622 typedef _Traits traits_type; 623 typedef typename traits_type::int_type int_type; 624 typedef typename traits_type::pos_type pos_type; 625 typedef typename traits_type::off_type off_type; 626 627 // Non-standard types: 628 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 629 typedef basic_ostream<char_type, traits_type> __ostream_type; 630 631 private: 632 /** 633 * @if maint 634 * @doctodo 635 * @endif 636 */ 637 __filebuf_type _M_filebuf; 638 639 public: 640 // Constructors: 641 /** 642 * @brief Default constructor. 643 * 644 * Initializes @c sb using its default constructor, and passes 645 * @c &sb to the base class initializer. Does not open any files 646 * (you haven't given it a filename to open). 647 */ 648 basic_ofstream(): __ostream_type(), _M_filebuf() 649 { this->init(&_M_filebuf); } 650 651 /** 652 * @brief Create an output file stream. 653 * @param s Null terminated string specifying the filename. 654 * @param mode Open file in specified mode (see std::ios_base). 655 * 656 * @c ios_base::out|ios_base::trunc is automatically included in 657 * @a mode. 658 * 659 * Tip: When using std::string to hold the filename, you must use 660 * .c_str() before passing it to this constructor. 661 */ 662 explicit 663 basic_ofstream(const char* __s, 664 ios_base::openmode __mode = ios_base::out|ios_base::trunc) 665 : __ostream_type(), _M_filebuf() 666 { 667 this->init(&_M_filebuf); 668 this->open(__s, __mode); 669 } 670 671 /** 672 * @brief The destructor does nothing. 673 * 674 * The file is closed by the filebuf object, not the formatting 675 * stream. 676 */ 677 ~basic_ofstream() 678 { } 679 680 // Members: 681 /** 682 * @brief Accessing the underlying buffer. 683 * @return The current basic_filebuf buffer. 684 * 685 * This hides both signatures of std::basic_ios::rdbuf(). 686 */ 687 __filebuf_type* 688 rdbuf() const 689 { return const_cast<__filebuf_type*>(&_M_filebuf); } 690 691 /** 692 * @brief Wrapper to test for an open file. 693 * @return @c rdbuf()->is_open() 694 */ 695 bool 696 is_open() { return _M_filebuf.is_open(); } 697 698 /** 699 * @brief Opens an external file. 700 * @param s The name of the file. 701 * @param mode The open mode flags. 702 * 703 * Calls @c std::basic_filebuf::open(s,mode|out|trunc). If that 704 * function fails, @c failbit is set in the stream's error state. 705 * 706 * Tip: When using std::string to hold the filename, you must use 707 * .c_str() before passing it to this constructor. 708 */ 709 void 710 open(const char* __s, 711 ios_base::openmode __mode = ios_base::out | ios_base::trunc) 712 { 713 if (!_M_filebuf.open(__s, __mode | ios_base::out)) 714 this->setstate(ios_base::failbit); 715 } 716 717 /** 718 * @brief Close the file. 719 * 720 * Calls @c std::basic_filebuf::close(). If that function 721 * fails, @c failbit is set in the stream's error state. 722 */ 723 void 724 close() 725 { 726 if (!_M_filebuf.close()) 727 this->setstate(ios_base::failbit); 728 } 729 }; 730 731 732 // [27.8.1.11] Template class basic_fstream 733 /** 734 * @brief Controlling intput and output for files. 735 * 736 * This class supports reading from and writing to named files, using 737 * the inherited functions from std::basic_iostream. To control the 738 * associated sequence, an instance of std::basic_filebuf is used, which 739 * this page refers to as @c sb. 740 */ 741 template<typename _CharT, typename _Traits> 742 class basic_fstream : public basic_iostream<_CharT, _Traits> 743 { 744 public: 745 // Types: 746 typedef _CharT char_type; 747 typedef _Traits traits_type; 748 typedef typename traits_type::int_type int_type; 749 typedef typename traits_type::pos_type pos_type; 750 typedef typename traits_type::off_type off_type; 751 752 // Non-standard types: 753 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 754 typedef basic_ios<char_type, traits_type> __ios_type; 755 typedef basic_iostream<char_type, traits_type> __iostream_type; 756 757 private: 758 /** 759 * @if maint 760 * @doctodo 761 * @endif 762 */ 763 __filebuf_type _M_filebuf; 764 765 public: 766 // Constructors/destructor: 767 /** 768 * @brief Default constructor. 769 * 770 * Initializes @c sb using its default constructor, and passes 771 * @c &sb to the base class initializer. Does not open any files 772 * (you haven't given it a filename to open). 773 */ 774 basic_fstream() 775 : __iostream_type(), _M_filebuf() 776 { this->init(&_M_filebuf); } 777 778 /** 779 * @brief Create an input/output file stream. 780 * @param s Null terminated string specifying the filename. 781 * @param mode Open file in specified mode (see std::ios_base). 782 * 783 * Tip: When using std::string to hold the filename, you must use 784 * .c_str() before passing it to this constructor. 785 */ 786 explicit 787 basic_fstream(const char* __s, 788 ios_base::openmode __mode = ios_base::in | ios_base::out) 789 : __iostream_type(NULL), _M_filebuf() 790 { 791 this->init(&_M_filebuf); 792 this->open(__s, __mode); 793 } 794 795 /** 796 * @brief The destructor does nothing. 797 * 798 * The file is closed by the filebuf object, not the formatting 799 * stream. 800 */ 801 ~basic_fstream() 802 { } 803 804 // Members: 805 /** 806 * @brief Accessing the underlying buffer. 807 * @return The current basic_filebuf buffer. 808 * 809 * This hides both signatures of std::basic_ios::rdbuf(). 810 */ 811 __filebuf_type* 812 rdbuf() const 813 { return const_cast<__filebuf_type*>(&_M_filebuf); } 814 815 /** 816 * @brief Wrapper to test for an open file. 817 * @return @c rdbuf()->is_open() 818 */ 819 bool 820 is_open() { return _M_filebuf.is_open(); } 821 822 /** 823 * @brief Opens an external file. 824 * @param s The name of the file. 825 * @param mode The open mode flags. 826 * 827 * Calls @c std::basic_filebuf::open(s,mode). If that 828 * function fails, @c failbit is set in the stream's error state. 829 * 830 * Tip: When using std::string to hold the filename, you must use 831 * .c_str() before passing it to this constructor. 832 */ 833 void 834 open(const char* __s, 835 ios_base::openmode __mode = ios_base::in | ios_base::out) 836 { 837 if (!_M_filebuf.open(__s, __mode)) 838 this->setstate(ios_base::failbit); 839 } 840 841 /** 842 * @brief Close the file. 843 * 844 * Calls @c std::basic_filebuf::close(). If that function 845 * fails, @c failbit is set in the stream's error state. 846 */ 847 void 848 close() 849 { 850 if (!_M_filebuf.close()) 851 this->setstate(ios_base::failbit); 852 } 853 }; 854 } // namespace std 855 856 #ifndef _GLIBCXX_EXPORT_TEMPLATE 857 # include <bits/fstream.tcc> 858 #endif 859 860 #endif /* _GLIBCXX_FSTREAM */ 861