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 // [documentation is inherited] 424 virtual streamsize 425 xsputn(const char_type* __s, streamsize __n); 426 427 // Flushes output buffer, then writes unshift sequence. 428 /** 429 * @if maint 430 * @doctodo 431 * @endif 432 */ 433 bool 434 _M_terminate_output(); 435 436 /** 437 * @if maint 438 * This function sets the pointers of the internal buffer, both get 439 * and put areas. Typically: 440 * 441 * __off == egptr() - eback() upon underflow/uflow ('read' mode); 442 * __off == 0 upon overflow ('write' mode); 443 * __off == -1 upon open, setbuf, seekoff/pos ('uncommitted' mode). 444 * 445 * NB: epptr() - pbase() == _M_buf_size - 1, since _M_buf_size 446 * reflects the actual allocated memory and the last cell is reserved 447 * for the overflow char of a full put area. 448 * @endif 449 */ 450 void 451 _M_set_buffer(streamsize __off) 452 { 453 const bool __testin = this->_M_mode & ios_base::in; 454 const bool __testout = this->_M_mode & ios_base::out; 455 456 if (__testin && __off > 0) 457 this->setg(this->_M_buf, this->_M_buf, this->_M_buf + __off); 458 else 459 this->setg(this->_M_buf, this->_M_buf, this->_M_buf); 460 461 if (__testout && __off == 0 && this->_M_buf_size > 1 ) 462 this->setp(this->_M_buf, this->_M_buf + this->_M_buf_size - 1); 463 else 464 this->setp(NULL, NULL); 465 } 466 }; 467 468 // [27.8.1.5] Template class basic_ifstream 469 /** 470 * @brief Controlling input for files. 471 * 472 * This class supports reading from named files, using the inherited 473 * functions from std::basic_istream. To control the associated 474 * sequence, an instance of std::basic_filebuf is used, which this page 475 * refers to as @c sb. 476 */ 477 template<typename _CharT, typename _Traits> 478 class basic_ifstream : public basic_istream<_CharT, _Traits> 479 { 480 public: 481 // Types: 482 typedef _CharT char_type; 483 typedef _Traits traits_type; 484 typedef typename traits_type::int_type int_type; 485 typedef typename traits_type::pos_type pos_type; 486 typedef typename traits_type::off_type off_type; 487 488 // Non-standard types: 489 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 490 typedef basic_istream<char_type, traits_type> __istream_type; 491 492 private: 493 /** 494 * @if maint 495 * @doctodo 496 * @endif 497 */ 498 __filebuf_type _M_filebuf; 499 500 public: 501 // Constructors/Destructors: 502 /** 503 * @brief Default constructor. 504 * 505 * Initializes @c sb using its default constructor, and passes 506 * @c &sb to the base class initializer. Does not open any files 507 * (you haven't given it a filename to open). 508 */ 509 basic_ifstream() : __istream_type(), _M_filebuf() 510 { this->init(&_M_filebuf); } 511 512 /** 513 * @brief Create an input file stream. 514 * @param s Null terminated string specifying the filename. 515 * @param mode Open file in specified mode (see std::ios_base). 516 * 517 * @c ios_base::in is automatically included in @a mode. 518 * 519 * Tip: When using std::string to hold the filename, you must use 520 * .c_str() before passing it to this constructor. 521 */ 522 explicit 523 basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in) 524 : __istream_type(), _M_filebuf() 525 { 526 this->init(&_M_filebuf); 527 this->open(__s, __mode); 528 } 529 530 /** 531 * @brief The destructor does nothing. 532 * 533 * The file is closed by the filebuf object, not the formatting 534 * stream. 535 */ 536 ~basic_ifstream() 537 { } 538 539 // Members: 540 /** 541 * @brief Accessing the underlying buffer. 542 * @return The current basic_filebuf buffer. 543 * 544 * This hides both signatures of std::basic_ios::rdbuf(). 545 */ 546 __filebuf_type* 547 rdbuf() const 548 { return const_cast<__filebuf_type*>(&_M_filebuf); } 549 550 /** 551 * @brief Wrapper to test for an open file. 552 * @return @c rdbuf()->is_open() 553 */ 554 bool 555 is_open() { return _M_filebuf.is_open(); } 556 557 /** 558 * @brief Opens an external file. 559 * @param s The name of the file. 560 * @param mode The open mode flags. 561 * 562 * Calls @c std::basic_filebuf::open(s,mode|in). If that function 563 * fails, @c failbit is set in the stream's error state. 564 * 565 * Tip: When using std::string to hold the filename, you must use 566 * .c_str() before passing it to this constructor. 567 */ 568 void 569 open(const char* __s, ios_base::openmode __mode = ios_base::in) 570 { 571 if (!_M_filebuf.open(__s, __mode | ios_base::in)) 572 this->setstate(ios_base::failbit); 573 } 574 575 /** 576 * @brief Close the file. 577 * 578 * Calls @c std::basic_filebuf::close(). If that function 579 * fails, @c failbit is set in the stream's error state. 580 */ 581 void 582 close() 583 { 584 if (!_M_filebuf.close()) 585 this->setstate(ios_base::failbit); 586 } 587 }; 588 589 590 // [27.8.1.8] Template class basic_ofstream 591 /** 592 * @brief Controlling output for files. 593 * 594 * This class supports reading from named files, using the inherited 595 * functions from std::basic_ostream. To control the associated 596 * sequence, an instance of std::basic_filebuf is used, which this page 597 * refers to as @c sb. 598 */ 599 template<typename _CharT, typename _Traits> 600 class basic_ofstream : public basic_ostream<_CharT,_Traits> 601 { 602 public: 603 // Types: 604 typedef _CharT char_type; 605 typedef _Traits traits_type; 606 typedef typename traits_type::int_type int_type; 607 typedef typename traits_type::pos_type pos_type; 608 typedef typename traits_type::off_type off_type; 609 610 // Non-standard types: 611 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 612 typedef basic_ostream<char_type, traits_type> __ostream_type; 613 614 private: 615 /** 616 * @if maint 617 * @doctodo 618 * @endif 619 */ 620 __filebuf_type _M_filebuf; 621 622 public: 623 // Constructors: 624 /** 625 * @brief Default constructor. 626 * 627 * Initializes @c sb using its default constructor, and passes 628 * @c &sb to the base class initializer. Does not open any files 629 * (you haven't given it a filename to open). 630 */ 631 basic_ofstream(): __ostream_type(), _M_filebuf() 632 { this->init(&_M_filebuf); } 633 634 /** 635 * @brief Create an output file stream. 636 * @param s Null terminated string specifying the filename. 637 * @param mode Open file in specified mode (see std::ios_base). 638 * 639 * @c ios_base::out|ios_base::trunc is automatically included in 640 * @a mode. 641 * 642 * Tip: When using std::string to hold the filename, you must use 643 * .c_str() before passing it to this constructor. 644 */ 645 explicit 646 basic_ofstream(const char* __s, 647 ios_base::openmode __mode = ios_base::out|ios_base::trunc) 648 : __ostream_type(), _M_filebuf() 649 { 650 this->init(&_M_filebuf); 651 this->open(__s, __mode); 652 } 653 654 /** 655 * @brief The destructor does nothing. 656 * 657 * The file is closed by the filebuf object, not the formatting 658 * stream. 659 */ 660 ~basic_ofstream() 661 { } 662 663 // Members: 664 /** 665 * @brief Accessing the underlying buffer. 666 * @return The current basic_filebuf buffer. 667 * 668 * This hides both signatures of std::basic_ios::rdbuf(). 669 */ 670 __filebuf_type* 671 rdbuf() const 672 { return const_cast<__filebuf_type*>(&_M_filebuf); } 673 674 /** 675 * @brief Wrapper to test for an open file. 676 * @return @c rdbuf()->is_open() 677 */ 678 bool 679 is_open() { return _M_filebuf.is_open(); } 680 681 /** 682 * @brief Opens an external file. 683 * @param s The name of the file. 684 * @param mode The open mode flags. 685 * 686 * Calls @c std::basic_filebuf::open(s,mode|out|trunc). If that 687 * function fails, @c failbit is set in the stream's error state. 688 * 689 * Tip: When using std::string to hold the filename, you must use 690 * .c_str() before passing it to this constructor. 691 */ 692 void 693 open(const char* __s, 694 ios_base::openmode __mode = ios_base::out | ios_base::trunc) 695 { 696 if (!_M_filebuf.open(__s, __mode | ios_base::out)) 697 this->setstate(ios_base::failbit); 698 } 699 700 /** 701 * @brief Close the file. 702 * 703 * Calls @c std::basic_filebuf::close(). If that function 704 * fails, @c failbit is set in the stream's error state. 705 */ 706 void 707 close() 708 { 709 if (!_M_filebuf.close()) 710 this->setstate(ios_base::failbit); 711 } 712 }; 713 714 715 // [27.8.1.11] Template class basic_fstream 716 /** 717 * @brief Controlling intput and output for files. 718 * 719 * This class supports reading from and writing to named files, using 720 * the inherited functions from std::basic_iostream. To control the 721 * associated sequence, an instance of std::basic_filebuf is used, which 722 * this page refers to as @c sb. 723 */ 724 template<typename _CharT, typename _Traits> 725 class basic_fstream : public basic_iostream<_CharT, _Traits> 726 { 727 public: 728 // Types: 729 typedef _CharT char_type; 730 typedef _Traits traits_type; 731 typedef typename traits_type::int_type int_type; 732 typedef typename traits_type::pos_type pos_type; 733 typedef typename traits_type::off_type off_type; 734 735 // Non-standard types: 736 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 737 typedef basic_ios<char_type, traits_type> __ios_type; 738 typedef basic_iostream<char_type, traits_type> __iostream_type; 739 740 private: 741 /** 742 * @if maint 743 * @doctodo 744 * @endif 745 */ 746 __filebuf_type _M_filebuf; 747 748 public: 749 // Constructors/destructor: 750 /** 751 * @brief Default constructor. 752 * 753 * Initializes @c sb using its default constructor, and passes 754 * @c &sb to the base class initializer. Does not open any files 755 * (you haven't given it a filename to open). 756 */ 757 basic_fstream() 758 : __iostream_type(), _M_filebuf() 759 { this->init(&_M_filebuf); } 760 761 /** 762 * @brief Create an input/output file stream. 763 * @param s Null terminated string specifying the filename. 764 * @param mode Open file in specified mode (see std::ios_base). 765 * 766 * Tip: When using std::string to hold the filename, you must use 767 * .c_str() before passing it to this constructor. 768 */ 769 explicit 770 basic_fstream(const char* __s, 771 ios_base::openmode __mode = ios_base::in | ios_base::out) 772 : __iostream_type(NULL), _M_filebuf() 773 { 774 this->init(&_M_filebuf); 775 this->open(__s, __mode); 776 } 777 778 /** 779 * @brief The destructor does nothing. 780 * 781 * The file is closed by the filebuf object, not the formatting 782 * stream. 783 */ 784 ~basic_fstream() 785 { } 786 787 // Members: 788 /** 789 * @brief Accessing the underlying buffer. 790 * @return The current basic_filebuf buffer. 791 * 792 * This hides both signatures of std::basic_ios::rdbuf(). 793 */ 794 __filebuf_type* 795 rdbuf() const 796 { return const_cast<__filebuf_type*>(&_M_filebuf); } 797 798 /** 799 * @brief Wrapper to test for an open file. 800 * @return @c rdbuf()->is_open() 801 */ 802 bool 803 is_open() { return _M_filebuf.is_open(); } 804 805 /** 806 * @brief Opens an external file. 807 * @param s The name of the file. 808 * @param mode The open mode flags. 809 * 810 * Calls @c std::basic_filebuf::open(s,mode). If that 811 * function fails, @c failbit is set in the stream's error state. 812 * 813 * Tip: When using std::string to hold the filename, you must use 814 * .c_str() before passing it to this constructor. 815 */ 816 void 817 open(const char* __s, 818 ios_base::openmode __mode = ios_base::in | ios_base::out) 819 { 820 if (!_M_filebuf.open(__s, __mode)) 821 this->setstate(ios_base::failbit); 822 } 823 824 /** 825 * @brief Close the file. 826 * 827 * Calls @c std::basic_filebuf::close(). If that function 828 * fails, @c failbit is set in the stream's error state. 829 */ 830 void 831 close() 832 { 833 if (!_M_filebuf.close()) 834 this->setstate(ios_base::failbit); 835 } 836 }; 837 } // namespace std 838 839 #ifndef _GLIBCXX_EXPORT_TEMPLATE 840 # include <bits/fstream.tcc> 841 #endif 842 843 #endif /* _GLIBCXX_FSTREAM */ 844