1// File based streams -*- C++ -*- 2 3// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 4// 2006, 2007 5// Free Software Foundation, Inc. 6// 7// This file is part of the GNU ISO C++ Library. This library is free 8// software; you can redistribute it and/or modify it under the 9// terms of the GNU General Public License as published by the 10// Free Software Foundation; either version 2, or (at your option) 11// any later version. 12 13// This library is distributed in the hope that it will be useful, 14// but WITHOUT ANY WARRANTY; without even the implied warranty of 15// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16// GNU General Public License for more details. 17 18// You should have received a copy of the GNU General Public License along 19// with this library; see the file COPYING. If not, write to the Free 20// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 21// USA. 22 23// As a special exception, you may use this file as part of a free software 24// library without restriction. Specifically, if other files instantiate 25// templates or use macros or inline functions from this file, or you compile 26// this file and link it with other files to produce an executable, this 27// file does not by itself cause the resulting executable to be covered by 28// the GNU General Public License. This exception does not however 29// invalidate any other reasons why the executable file might be covered by 30// the GNU General Public License. 31 32/** @file fstream 33 * This is a Standard C++ Library header. 34 */ 35 36// 37// ISO C++ 14882: 27.8 File-based streams 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_GLIBCXX_BEGIN_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 typedef basic_streambuf<char_type, traits_type> __streambuf_type; 80 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 81 typedef __basic_file<char> __file_type; 82 typedef typename traits_type::state_type __state_type; 83 typedef codecvt<char_type, char, __state_type> __codecvt_type; 84 85 friend class ios_base; // For sync_with_stdio. 86 87 protected: 88 // Data Members: 89 // MT lock inherited from libio or other low-level io library. 90 __c_lock _M_lock; 91 92 // External buffer. 93 __file_type _M_file; 94 95 /** 96 * @if maint 97 * Place to stash in || out || in | out settings for current filebuf. 98 * @endif 99 */ 100 ios_base::openmode _M_mode; 101 102 // Beginning state type for codecvt. 103 __state_type _M_state_beg; 104 105 // During output, the state that corresponds to pptr(), 106 // during input, the state that corresponds to egptr() and 107 // _M_ext_next. 108 __state_type _M_state_cur; 109 110 // Not used for output. During input, the state that corresponds 111 // to eback() and _M_ext_buf. 112 __state_type _M_state_last; 113 114 /** 115 * @if maint 116 * Pointer to the beginning of internal buffer. 117 * @endif 118 */ 119 char_type* _M_buf; 120 121 /** 122 * @if maint 123 * Actual size of internal buffer. This number is equal to the size 124 * of the put area + 1 position, reserved for the overflow char of 125 * a full area. 126 * @endif 127 */ 128 size_t _M_buf_size; 129 130 // Set iff _M_buf is allocated memory from _M_allocate_internal_buffer. 131 bool _M_buf_allocated; 132 133 /** 134 * @if maint 135 * _M_reading == false && _M_writing == false for 'uncommitted' mode; 136 * _M_reading == true for 'read' mode; 137 * _M_writing == true for 'write' mode; 138 * 139 * NB: _M_reading == true && _M_writing == true is unused. 140 * @endif 141 */ 142 bool _M_reading; 143 bool _M_writing; 144 145 //@{ 146 /** 147 * @if maint 148 * Necessary bits for putback buffer management. 149 * 150 * @note pbacks of over one character are not currently supported. 151 * @endif 152 */ 153 char_type _M_pback; 154 char_type* _M_pback_cur_save; 155 char_type* _M_pback_end_save; 156 bool _M_pback_init; 157 //@} 158 159 // Cached codecvt facet. 160 const __codecvt_type* _M_codecvt; 161 162 /** 163 * @if maint 164 * Buffer for external characters. Used for input when 165 * codecvt::always_noconv() == false. When valid, this corresponds 166 * to eback(). 167 * @endif 168 */ 169 char* _M_ext_buf; 170 171 /** 172 * @if maint 173 * Size of buffer held by _M_ext_buf. 174 * @endif 175 */ 176 streamsize _M_ext_buf_size; 177 178 /** 179 * @if maint 180 * Pointers into the buffer held by _M_ext_buf that delimit a 181 * subsequence of bytes that have been read but not yet converted. 182 * When valid, _M_ext_next corresponds to egptr(). 183 * @endif 184 */ 185 const char* _M_ext_next; 186 char* _M_ext_end; 187 188 /** 189 * @if maint 190 * Initializes pback buffers, and moves normal buffers to safety. 191 * Assumptions: 192 * _M_in_cur has already been moved back 193 * @endif 194 */ 195 void 196 _M_create_pback() 197 { 198 if (!_M_pback_init) 199 { 200 _M_pback_cur_save = this->gptr(); 201 _M_pback_end_save = this->egptr(); 202 this->setg(&_M_pback, &_M_pback, &_M_pback + 1); 203 _M_pback_init = true; 204 } 205 } 206 207 /** 208 * @if maint 209 * Deactivates pback buffer contents, and restores normal buffer. 210 * Assumptions: 211 * The pback buffer has only moved forward. 212 * @endif 213 */ 214 void 215 _M_destroy_pback() throw() 216 { 217 if (_M_pback_init) 218 { 219 // Length _M_in_cur moved in the pback buffer. 220 _M_pback_cur_save += this->gptr() != this->eback(); 221 this->setg(_M_buf, _M_pback_cur_save, _M_pback_end_save); 222 _M_pback_init = false; 223 } 224 } 225 226 public: 227 // Constructors/destructor: 228 /** 229 * @brief Does not open any files. 230 * 231 * The default constructor initializes the parent class using its 232 * own default ctor. 233 */ 234 basic_filebuf(); 235 236 /** 237 * @brief The destructor closes the file first. 238 */ 239 virtual 240 ~basic_filebuf() 241 { this->close(); } 242 243 // Members: 244 /** 245 * @brief Returns true if the external file is open. 246 */ 247 bool 248 is_open() const throw() 249 { return _M_file.is_open(); } 250 251 /** 252 * @brief Opens an external file. 253 * @param s The name of the file. 254 * @param mode The open mode flags. 255 * @return @c this on success, NULL on failure 256 * 257 * If a file is already open, this function immediately fails. 258 * Otherwise it tries to open the file named @a s using the flags 259 * given in @a mode. 260 * 261 * Table 92, adapted here, gives the relation between openmode 262 * combinations and the equivalent fopen() flags. 263 * (NB: lines in|out|app and binary|in|out|app per DR 596) 264 * +---------------------------------------------------------+ 265 * | ios_base Flag combination stdio equivalent | 266 * |binary in out trunc app | 267 * +---------------------------------------------------------+ 268 * | + "w" | 269 * | + + "a" | 270 * | + + "w" | 271 * | + "r" | 272 * | + + "r+" | 273 * | + + + "w+" | 274 * | + + + "a+" | 275 * +---------------------------------------------------------+ 276 * | + + "wb" | 277 * | + + + "ab" | 278 * | + + + "wb" | 279 * | + + "rb" | 280 * | + + + "r+b" | 281 * | + + + + "w+b" | 282 * | + + + + "a+b" | 283 * +---------------------------------------------------------+ 284 */ 285 __filebuf_type* 286 open(const char* __s, ios_base::openmode __mode); 287 288 /** 289 * @brief Closes the currently associated file. 290 * @return @c this on success, NULL on failure 291 * 292 * If no file is currently open, this function immediately fails. 293 * 294 * If a "put buffer area" exists, @c overflow(eof) is called to flush 295 * all the characters. The file is then closed. 296 * 297 * If any operations fail, this function also fails. 298 */ 299 __filebuf_type* 300 close() throw(); 301 302 protected: 303 void 304 _M_allocate_internal_buffer(); 305 306 void 307 _M_destroy_internal_buffer() throw(); 308 309 // [27.8.1.4] overridden virtual functions 310 virtual streamsize 311 showmanyc(); 312 313 // Stroustrup, 1998, p. 628 314 // underflow() and uflow() functions are called to get the next 315 // charater from the real input source when the buffer is empty. 316 // Buffered input uses underflow() 317 318 virtual int_type 319 underflow(); 320 321 virtual int_type 322 pbackfail(int_type __c = _Traits::eof()); 323 324 // Stroustrup, 1998, p 648 325 // The overflow() function is called to transfer characters to the 326 // real output destination when the buffer is full. A call to 327 // overflow(c) outputs the contents of the buffer plus the 328 // character c. 329 // 27.5.2.4.5 330 // Consume some sequence of the characters in the pending sequence. 331 virtual int_type 332 overflow(int_type __c = _Traits::eof()); 333 334 // Convert internal byte sequence to external, char-based 335 // sequence via codecvt. 336 bool 337 _M_convert_to_external(char_type*, streamsize); 338 339 /** 340 * @brief Manipulates the buffer. 341 * @param s Pointer to a buffer area. 342 * @param n Size of @a s. 343 * @return @c this 344 * 345 * If no file has been opened, and both @a s and @a n are zero, then 346 * the stream becomes unbuffered. Otherwise, @c s is used as a 347 * buffer; see 348 * http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2 349 * for more. 350 */ 351 virtual __streambuf_type* 352 setbuf(char_type* __s, streamsize __n); 353 354 virtual pos_type 355 seekoff(off_type __off, ios_base::seekdir __way, 356 ios_base::openmode __mode = ios_base::in | ios_base::out); 357 358 virtual pos_type 359 seekpos(pos_type __pos, 360 ios_base::openmode __mode = ios_base::in | ios_base::out); 361 362 // Common code for seekoff and seekpos 363 pos_type 364 _M_seek(off_type __off, ios_base::seekdir __way, __state_type __state); 365 366 virtual int 367 sync(); 368 369 virtual void 370 imbue(const locale& __loc); 371 372 virtual streamsize 373 xsgetn(char_type* __s, streamsize __n); 374 375 virtual streamsize 376 xsputn(const char_type* __s, streamsize __n); 377 378 // Flushes output buffer, then writes unshift sequence. 379 bool 380 _M_terminate_output(); 381 382 /** 383 * @if maint 384 * This function sets the pointers of the internal buffer, both get 385 * and put areas. Typically: 386 * 387 * __off == egptr() - eback() upon underflow/uflow ('read' mode); 388 * __off == 0 upon overflow ('write' mode); 389 * __off == -1 upon open, setbuf, seekoff/pos ('uncommitted' mode). 390 * 391 * NB: epptr() - pbase() == _M_buf_size - 1, since _M_buf_size 392 * reflects the actual allocated memory and the last cell is reserved 393 * for the overflow char of a full put area. 394 * @endif 395 */ 396 void 397 _M_set_buffer(streamsize __off) 398 { 399 const bool __testin = _M_mode & ios_base::in; 400 const bool __testout = _M_mode & ios_base::out; 401 402 if (__testin && __off > 0) 403 this->setg(_M_buf, _M_buf, _M_buf + __off); 404 else 405 this->setg(_M_buf, _M_buf, _M_buf); 406 407 if (__testout && __off == 0 && _M_buf_size > 1 ) 408 this->setp(_M_buf, _M_buf + _M_buf_size - 1); 409 else 410 this->setp(NULL, NULL); 411 } 412 }; 413 414 // [27.8.1.5] Template class basic_ifstream 415 /** 416 * @brief Controlling input for files. 417 * 418 * This class supports reading from named files, using the inherited 419 * functions from std::basic_istream. To control the associated 420 * sequence, an instance of std::basic_filebuf is used, which this page 421 * refers to as @c sb. 422 */ 423 template<typename _CharT, typename _Traits> 424 class basic_ifstream : public basic_istream<_CharT, _Traits> 425 { 426 public: 427 // Types: 428 typedef _CharT char_type; 429 typedef _Traits traits_type; 430 typedef typename traits_type::int_type int_type; 431 typedef typename traits_type::pos_type pos_type; 432 typedef typename traits_type::off_type off_type; 433 434 // Non-standard types: 435 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 436 typedef basic_istream<char_type, traits_type> __istream_type; 437 438 private: 439 __filebuf_type _M_filebuf; 440 441 public: 442 // Constructors/Destructors: 443 /** 444 * @brief Default constructor. 445 * 446 * Initializes @c sb using its default constructor, and passes 447 * @c &sb to the base class initializer. Does not open any files 448 * (you haven't given it a filename to open). 449 */ 450 basic_ifstream() : __istream_type(), _M_filebuf() 451 { this->init(&_M_filebuf); } 452 453 /** 454 * @brief Create an input file stream. 455 * @param s Null terminated string specifying the filename. 456 * @param mode Open file in specified mode (see std::ios_base). 457 * 458 * @c ios_base::in is automatically included in @a mode. 459 * 460 * Tip: When using std::string to hold the filename, you must use 461 * .c_str() before passing it to this constructor. 462 */ 463 explicit 464 basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in) 465 : __istream_type(), _M_filebuf() 466 { 467 this->init(&_M_filebuf); 468 this->open(__s, __mode); 469 } 470 471 /** 472 * @brief The destructor does nothing. 473 * 474 * The file is closed by the filebuf object, not the formatting 475 * stream. 476 */ 477 ~basic_ifstream() 478 { } 479 480 // Members: 481 /** 482 * @brief Accessing the underlying buffer. 483 * @return The current basic_filebuf buffer. 484 * 485 * This hides both signatures of std::basic_ios::rdbuf(). 486 */ 487 __filebuf_type* 488 rdbuf() const 489 { return const_cast<__filebuf_type*>(&_M_filebuf); } 490 491 /** 492 * @brief Wrapper to test for an open file. 493 * @return @c rdbuf()->is_open() 494 */ 495 bool 496 is_open() 497 { return _M_filebuf.is_open(); } 498 499 // _GLIBCXX_RESOLVE_LIB_DEFECTS 500 // 365. Lack of const-qualification in clause 27 501 bool 502 is_open() const 503 { return _M_filebuf.is_open(); } 504 505 /** 506 * @brief Opens an external file. 507 * @param s The name of the file. 508 * @param mode The open mode flags. 509 * 510 * Calls @c std::basic_filebuf::open(s,mode|in). If that function 511 * fails, @c failbit is set in the stream's error state. 512 * 513 * Tip: When using std::string to hold the filename, you must use 514 * .c_str() before passing it to this constructor. 515 */ 516 void 517 open(const char* __s, ios_base::openmode __mode = ios_base::in) 518 { 519 if (!_M_filebuf.open(__s, __mode | ios_base::in)) 520 this->setstate(ios_base::failbit); 521 else 522 // _GLIBCXX_RESOLVE_LIB_DEFECTS 523 // 409. Closing an fstream should clear error state 524 this->clear(); 525 } 526 527 /** 528 * @brief Close the file. 529 * 530 * Calls @c std::basic_filebuf::close(). If that function 531 * fails, @c failbit is set in the stream's error state. 532 */ 533 void 534 close() 535 { 536 if (!_M_filebuf.close()) 537 this->setstate(ios_base::failbit); 538 } 539 }; 540 541 542 // [27.8.1.8] Template class basic_ofstream 543 /** 544 * @brief Controlling output for files. 545 * 546 * This class supports reading from named files, using the inherited 547 * functions from std::basic_ostream. To control the associated 548 * sequence, an instance of std::basic_filebuf is used, which this page 549 * refers to as @c sb. 550 */ 551 template<typename _CharT, typename _Traits> 552 class basic_ofstream : public basic_ostream<_CharT,_Traits> 553 { 554 public: 555 // Types: 556 typedef _CharT char_type; 557 typedef _Traits traits_type; 558 typedef typename traits_type::int_type int_type; 559 typedef typename traits_type::pos_type pos_type; 560 typedef typename traits_type::off_type off_type; 561 562 // Non-standard types: 563 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 564 typedef basic_ostream<char_type, traits_type> __ostream_type; 565 566 private: 567 __filebuf_type _M_filebuf; 568 569 public: 570 // Constructors: 571 /** 572 * @brief Default constructor. 573 * 574 * Initializes @c sb using its default constructor, and passes 575 * @c &sb to the base class initializer. Does not open any files 576 * (you haven't given it a filename to open). 577 */ 578 basic_ofstream(): __ostream_type(), _M_filebuf() 579 { this->init(&_M_filebuf); } 580 581 /** 582 * @brief Create an output file stream. 583 * @param s Null terminated string specifying the filename. 584 * @param mode Open file in specified mode (see std::ios_base). 585 * 586 * @c ios_base::out|ios_base::trunc is automatically included in 587 * @a mode. 588 * 589 * Tip: When using std::string to hold the filename, you must use 590 * .c_str() before passing it to this constructor. 591 */ 592 explicit 593 basic_ofstream(const char* __s, 594 ios_base::openmode __mode = ios_base::out|ios_base::trunc) 595 : __ostream_type(), _M_filebuf() 596 { 597 this->init(&_M_filebuf); 598 this->open(__s, __mode); 599 } 600 601 /** 602 * @brief The destructor does nothing. 603 * 604 * The file is closed by the filebuf object, not the formatting 605 * stream. 606 */ 607 ~basic_ofstream() 608 { } 609 610 // Members: 611 /** 612 * @brief Accessing the underlying buffer. 613 * @return The current basic_filebuf buffer. 614 * 615 * This hides both signatures of std::basic_ios::rdbuf(). 616 */ 617 __filebuf_type* 618 rdbuf() const 619 { return const_cast<__filebuf_type*>(&_M_filebuf); } 620 621 /** 622 * @brief Wrapper to test for an open file. 623 * @return @c rdbuf()->is_open() 624 */ 625 bool 626 is_open() 627 { return _M_filebuf.is_open(); } 628 629 // _GLIBCXX_RESOLVE_LIB_DEFECTS 630 // 365. Lack of const-qualification in clause 27 631 bool 632 is_open() const 633 { return _M_filebuf.is_open(); } 634 635 /** 636 * @brief Opens an external file. 637 * @param s The name of the file. 638 * @param mode The open mode flags. 639 * 640 * Calls @c std::basic_filebuf::open(s,mode|out|trunc). If that 641 * function fails, @c failbit is set in the stream's error state. 642 * 643 * Tip: When using std::string to hold the filename, you must use 644 * .c_str() before passing it to this constructor. 645 */ 646 void 647 open(const char* __s, 648 ios_base::openmode __mode = ios_base::out | ios_base::trunc) 649 { 650 if (!_M_filebuf.open(__s, __mode | ios_base::out)) 651 this->setstate(ios_base::failbit); 652 else 653 // _GLIBCXX_RESOLVE_LIB_DEFECTS 654 // 409. Closing an fstream should clear error state 655 this->clear(); 656 } 657 658 /** 659 * @brief Close the file. 660 * 661 * Calls @c std::basic_filebuf::close(). If that function 662 * fails, @c failbit is set in the stream's error state. 663 */ 664 void 665 close() 666 { 667 if (!_M_filebuf.close()) 668 this->setstate(ios_base::failbit); 669 } 670 }; 671 672 673 // [27.8.1.11] Template class basic_fstream 674 /** 675 * @brief Controlling intput and output for files. 676 * 677 * This class supports reading from and writing to named files, using 678 * the inherited functions from std::basic_iostream. To control the 679 * associated sequence, an instance of std::basic_filebuf is used, which 680 * this page refers to as @c sb. 681 */ 682 template<typename _CharT, typename _Traits> 683 class basic_fstream : public basic_iostream<_CharT, _Traits> 684 { 685 public: 686 // Types: 687 typedef _CharT char_type; 688 typedef _Traits traits_type; 689 typedef typename traits_type::int_type int_type; 690 typedef typename traits_type::pos_type pos_type; 691 typedef typename traits_type::off_type off_type; 692 693 // Non-standard types: 694 typedef basic_filebuf<char_type, traits_type> __filebuf_type; 695 typedef basic_ios<char_type, traits_type> __ios_type; 696 typedef basic_iostream<char_type, traits_type> __iostream_type; 697 698 private: 699 __filebuf_type _M_filebuf; 700 701 public: 702 // Constructors/destructor: 703 /** 704 * @brief Default constructor. 705 * 706 * Initializes @c sb using its default constructor, and passes 707 * @c &sb to the base class initializer. Does not open any files 708 * (you haven't given it a filename to open). 709 */ 710 basic_fstream() 711 : __iostream_type(), _M_filebuf() 712 { this->init(&_M_filebuf); } 713 714 /** 715 * @brief Create an input/output file stream. 716 * @param s Null terminated string specifying the filename. 717 * @param mode Open file in specified mode (see std::ios_base). 718 * 719 * Tip: When using std::string to hold the filename, you must use 720 * .c_str() before passing it to this constructor. 721 */ 722 explicit 723 basic_fstream(const char* __s, 724 ios_base::openmode __mode = ios_base::in | ios_base::out) 725 : __iostream_type(NULL), _M_filebuf() 726 { 727 this->init(&_M_filebuf); 728 this->open(__s, __mode); 729 } 730 731 /** 732 * @brief The destructor does nothing. 733 * 734 * The file is closed by the filebuf object, not the formatting 735 * stream. 736 */ 737 ~basic_fstream() 738 { } 739 740 // Members: 741 /** 742 * @brief Accessing the underlying buffer. 743 * @return The current basic_filebuf buffer. 744 * 745 * This hides both signatures of std::basic_ios::rdbuf(). 746 */ 747 __filebuf_type* 748 rdbuf() const 749 { return const_cast<__filebuf_type*>(&_M_filebuf); } 750 751 /** 752 * @brief Wrapper to test for an open file. 753 * @return @c rdbuf()->is_open() 754 */ 755 bool 756 is_open() 757 { return _M_filebuf.is_open(); } 758 759 // _GLIBCXX_RESOLVE_LIB_DEFECTS 760 // 365. Lack of const-qualification in clause 27 761 bool 762 is_open() const 763 { return _M_filebuf.is_open(); } 764 765 /** 766 * @brief Opens an external file. 767 * @param s The name of the file. 768 * @param mode The open mode flags. 769 * 770 * Calls @c std::basic_filebuf::open(s,mode). If that 771 * function fails, @c failbit is set in the stream's error state. 772 * 773 * Tip: When using std::string to hold the filename, you must use 774 * .c_str() before passing it to this constructor. 775 */ 776 void 777 open(const char* __s, 778 ios_base::openmode __mode = ios_base::in | ios_base::out) 779 { 780 if (!_M_filebuf.open(__s, __mode)) 781 this->setstate(ios_base::failbit); 782 else 783 // _GLIBCXX_RESOLVE_LIB_DEFECTS 784 // 409. Closing an fstream should clear error state 785 this->clear(); 786 } 787 788 /** 789 * @brief Close the file. 790 * 791 * Calls @c std::basic_filebuf::close(). If that function 792 * fails, @c failbit is set in the stream's error state. 793 */ 794 void 795 close() 796 { 797 if (!_M_filebuf.close()) 798 this->setstate(ios_base::failbit); 799 } 800 }; 801 802_GLIBCXX_END_NAMESPACE 803 804#ifndef _GLIBCXX_EXPORT_TEMPLATE 805# include <bits/fstream.tcc> 806#endif 807 808#endif /* _GLIBCXX_FSTREAM */ 809