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1 // Stream buffer classes -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
4 // 2006, 2007, 2008, 2009 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 3, or (at your option)
10 // any later version.
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.
17 // Under Section 7 of GPL version 3, you are granted additional
18 // permissions described in the GCC Runtime Library Exception, version
19 // 3.1, as published by the Free Software Foundation.
21 // You should have received a copy of the GNU General Public License and
22 // a copy of the GCC Runtime Library Exception along with this program;
23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 // <http://www.gnu.org/licenses/>.
26 /** @file streambuf
27 * This is a Standard C++ Library header.
28 */
30 //
31 // ISO C++ 14882: 27.5 Stream buffers
32 //
34 #ifndef _GLIBXX_STREAMBUF
35 #define _GLIBXX_STREAMBUF 1
37 #pragma GCC system_header
39 #include <bits/c++config.h>
40 #include <iosfwd>
41 #include <bits/localefwd.h>
42 #include <bits/ios_base.h>
43 #include <bits/cpp_type_traits.h>
44 #include <ext/type_traits.h>
46 _GLIBCXX_BEGIN_NAMESPACE(std)
48 template<typename _CharT, typename _Traits>
49 streamsize
50 __copy_streambufs_eof(basic_streambuf<_CharT, _Traits>*,
51 basic_streambuf<_CharT, _Traits>*, bool&);
53 /**
54 * @brief The actual work of input and output (interface).
55 *
56 * This is a base class. Derived stream buffers each control a
57 * pair of character sequences: one for input, and one for output.
58 *
59 * Section [27.5.1] of the standard describes the requirements and
60 * behavior of stream buffer classes. That section (three paragraphs)
61 * is reproduced here, for simplicity and accuracy.
62 *
63 * -# Stream buffers can impose various constraints on the sequences
64 * they control. Some constraints are:
65 * - The controlled input sequence can be not readable.
66 * - The controlled output sequence can be not writable.
67 * - The controlled sequences can be associated with the contents of
68 * other representations for character sequences, such as external
69 * files.
70 * - The controlled sequences can support operations @e directly to or
71 * from associated sequences.
72 * - The controlled sequences can impose limitations on how the
73 * program can read characters from a sequence, write characters to
74 * a sequence, put characters back into an input sequence, or alter
75 * the stream position.
76 * .
77 * -# Each sequence is characterized by three pointers which, if non-null,
78 * all point into the same @c charT array object. The array object
79 * represents, at any moment, a (sub)sequence of characters from the
80 * sequence. Operations performed on a sequence alter the values
81 * stored in these pointers, perform reads and writes directly to or
82 * from associated sequences, and alter "the stream position" and
83 * conversion state as needed to maintain this subsequence relationship.
84 * The three pointers are:
85 * - the <em>beginning pointer</em>, or lowest element address in the
86 * array (called @e xbeg here);
87 * - the <em>next pointer</em>, or next element address that is a
88 * current candidate for reading or writing (called @e xnext here);
89 * - the <em>end pointer</em>, or first element address beyond the
90 * end of the array (called @e xend here).
91 * .
92 * -# The following semantic constraints shall always apply for any set
93 * of three pointers for a sequence, using the pointer names given
94 * immediately above:
95 * - If @e xnext is not a null pointer, then @e xbeg and @e xend shall
96 * also be non-null pointers into the same @c charT array, as
97 * described above; otherwise, @e xbeg and @e xend shall also be null.
98 * - If @e xnext is not a null pointer and @e xnext < @e xend for an
99 * output sequence, then a <em>write position</em> is available.
100 * In this case, @e *xnext shall be assignable as the next element
101 * to write (to put, or to store a character value, into the sequence).
102 * - If @e xnext is not a null pointer and @e xbeg < @e xnext for an
103 * input sequence, then a <em>putback position</em> is available.
104 * In this case, @e xnext[-1] shall have a defined value and is the
105 * next (preceding) element to store a character that is put back
106 * into the input sequence.
107 * - If @e xnext is not a null pointer and @e xnext< @e xend for an
108 * input sequence, then a <em>read position</em> is available.
109 * In this case, @e *xnext shall have a defined value and is the
110 * next element to read (to get, or to obtain a character value,
111 * from the sequence).
112 */
113 template<typename _CharT, typename _Traits>
114 class basic_streambuf
115 {
116 public:
117 //@{
118 /**
119 * These are standard types. They permit a standardized way of
120 * referring to names of (or names dependant on) the template
121 * parameters, which are specific to the implementation.
122 */
123 typedef _CharT char_type;
124 typedef _Traits traits_type;
125 typedef typename traits_type::int_type int_type;
126 typedef typename traits_type::pos_type pos_type;
127 typedef typename traits_type::off_type off_type;
128 //@}
130 //@{
131 /// This is a non-standard type.
132 typedef basic_streambuf<char_type, traits_type> __streambuf_type;
133 //@}
135 friend class basic_ios<char_type, traits_type>;
136 friend class basic_istream<char_type, traits_type>;
137 friend class basic_ostream<char_type, traits_type>;
138 friend class istreambuf_iterator<char_type, traits_type>;
139 friend class ostreambuf_iterator<char_type, traits_type>;
141 friend streamsize
142 __copy_streambufs_eof<>(__streambuf_type*, __streambuf_type*, bool&);
144 template<bool _IsMove, typename _CharT2>
145 friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
146 _CharT2*>::__type
147 __copy_move_a2(istreambuf_iterator<_CharT2>,
148 istreambuf_iterator<_CharT2>, _CharT2*);
150 template<typename _CharT2>
151 friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
152 istreambuf_iterator<_CharT2> >::__type
153 find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
154 const _CharT2&);
156 template<typename _CharT2, typename _Traits2>
157 friend basic_istream<_CharT2, _Traits2>&
158 operator>>(basic_istream<_CharT2, _Traits2>&, _CharT2*);
160 template<typename _CharT2, typename _Traits2, typename _Alloc>
161 friend basic_istream<_CharT2, _Traits2>&
162 operator>>(basic_istream<_CharT2, _Traits2>&,
163 basic_string<_CharT2, _Traits2, _Alloc>&);
165 template<typename _CharT2, typename _Traits2, typename _Alloc>
166 friend basic_istream<_CharT2, _Traits2>&
167 getline(basic_istream<_CharT2, _Traits2>&,
168 basic_string<_CharT2, _Traits2, _Alloc>&, _CharT2);
170 protected:
171 //@{
172 /**
173 * This is based on _IO_FILE, just reordered to be more consistent,
174 * and is intended to be the most minimal abstraction for an
175 * internal buffer.
176 * - get == input == read
177 * - put == output == write
178 */
179 char_type* _M_in_beg; // Start of get area.
180 char_type* _M_in_cur; // Current read area.
181 char_type* _M_in_end; // End of get area.
182 char_type* _M_out_beg; // Start of put area.
183 char_type* _M_out_cur; // Current put area.
184 char_type* _M_out_end; // End of put area.
186 /// Current locale setting.
187 locale _M_buf_locale;
189 public:
190 /// Destructor deallocates no buffer space.
191 virtual
192 ~basic_streambuf()
193 { }
195 // [27.5.2.2.1] locales
196 /**
197 * @brief Entry point for imbue().
198 * @param loc The new locale.
199 * @return The previous locale.
200 *
201 * Calls the derived imbue(loc).
202 */
203 locale
204 pubimbue(const locale &__loc)
205 {
206 locale __tmp(this->getloc());
207 this->imbue(__loc);
208 _M_buf_locale = __loc;
209 return __tmp;
210 }
212 /**
213 * @brief Locale access.
214 * @return The current locale in effect.
215 *
216 * If pubimbue(loc) has been called, then the most recent @c loc
217 * is returned. Otherwise the global locale in effect at the time
218 * of construction is returned.
219 */
220 locale
221 getloc() const
222 { return _M_buf_locale; }
224 // [27.5.2.2.2] buffer management and positioning
225 //@{
226 /**
227 * @brief Entry points for derived buffer functions.
228 *
229 * The public versions of @c pubfoo dispatch to the protected
230 * derived @c foo member functions, passing the arguments (if any)
231 * and returning the result unchanged.
232 */
233 __streambuf_type*
234 pubsetbuf(char_type* __s, streamsize __n)
235 { return this->setbuf(__s, __n); }
237 pos_type
238 pubseekoff(off_type __off, ios_base::seekdir __way,
239 ios_base::openmode __mode = ios_base::in | ios_base::out)
240 { return this->seekoff(__off, __way, __mode); }
242 pos_type
243 pubseekpos(pos_type __sp,
244 ios_base::openmode __mode = ios_base::in | ios_base::out)
245 { return this->seekpos(__sp, __mode); }
247 int
248 pubsync() { return this->sync(); }
249 //@}
251 // [27.5.2.2.3] get area
252 /**
253 * @brief Looking ahead into the stream.
254 * @return The number of characters available.
255 *
256 * If a read position is available, returns the number of characters
257 * available for reading before the buffer must be refilled.
258 * Otherwise returns the derived @c showmanyc().
259 */
260 streamsize
261 in_avail()
262 {
263 const streamsize __ret = this->egptr() - this->gptr();
264 return __ret ? __ret : this->showmanyc();
265 }
267 /**
268 * @brief Getting the next character.
269 * @return The next character, or eof.
270 *
271 * Calls @c sbumpc(), and if that function returns
272 * @c traits::eof(), so does this function. Otherwise, @c sgetc().
273 */
274 int_type
275 snextc()
276 {
277 int_type __ret = traits_type::eof();
278 if (__builtin_expect(!traits_type::eq_int_type(this->sbumpc(),
279 __ret), true))
280 __ret = this->sgetc();
281 return __ret;
282 }
284 /**
285 * @brief Getting the next character.
286 * @return The next character, or eof.
287 *
288 * If the input read position is available, returns that character
289 * and increments the read pointer, otherwise calls and returns
290 * @c uflow().
291 */
292 int_type
293 sbumpc()
294 {
295 int_type __ret;
296 if (__builtin_expect(this->gptr() < this->egptr(), true))
297 {
298 __ret = traits_type::to_int_type(*this->gptr());
299 this->gbump(1);
300 }
301 else
302 __ret = this->uflow();
303 return __ret;
304 }
306 /**
307 * @brief Getting the next character.
308 * @return The next character, or eof.
309 *
310 * If the input read position is available, returns that character,
311 * otherwise calls and returns @c underflow(). Does not move the
312 * read position after fetching the character.
313 */
314 int_type
315 sgetc()
316 {
317 int_type __ret;
318 if (__builtin_expect(this->gptr() < this->egptr(), true))
319 __ret = traits_type::to_int_type(*this->gptr());
320 else
321 __ret = this->underflow();
322 return __ret;
323 }
325 /**
326 * @brief Entry point for xsgetn.
327 * @param s A buffer area.
328 * @param n A count.
329 *
330 * Returns xsgetn(s,n). The effect is to fill @a s[0] through
331 * @a s[n-1] with characters from the input sequence, if possible.
332 */
333 streamsize
334 sgetn(char_type* __s, streamsize __n)
335 { return this->xsgetn(__s, __n); }
337 // [27.5.2.2.4] putback
338 /**
339 * @brief Pushing characters back into the input stream.
340 * @param c The character to push back.
341 * @return The previous character, if possible.
342 *
343 * Similar to sungetc(), but @a c is pushed onto the stream instead
344 * of "the previous character". If successful, the next character
345 * fetched from the input stream will be @a c.
346 */
347 int_type
348 sputbackc(char_type __c)
349 {
350 int_type __ret;
351 const bool __testpos = this->eback() < this->gptr();
352 if (__builtin_expect(!__testpos ||
353 !traits_type::eq(__c, this->gptr()[-1]), false))
354 __ret = this->pbackfail(traits_type::to_int_type(__c));
355 else
356 {
357 this->gbump(-1);
358 __ret = traits_type::to_int_type(*this->gptr());
359 }
360 return __ret;
361 }
363 /**
364 * @brief Moving backwards in the input stream.
365 * @return The previous character, if possible.
366 *
367 * If a putback position is available, this function decrements the
368 * input pointer and returns that character. Otherwise, calls and
369 * returns pbackfail(). The effect is to "unget" the last character
370 * "gotten".
371 */
372 int_type
373 sungetc()
374 {
375 int_type __ret;
376 if (__builtin_expect(this->eback() < this->gptr(), true))
377 {
378 this->gbump(-1);
379 __ret = traits_type::to_int_type(*this->gptr());
380 }
381 else
382 __ret = this->pbackfail();
383 return __ret;
384 }
386 // [27.5.2.2.5] put area
387 /**
388 * @brief Entry point for all single-character output functions.
389 * @param c A character to output.
390 * @return @a c, if possible.
391 *
392 * One of two public output functions.
393 *
394 * If a write position is available for the output sequence (i.e.,
395 * the buffer is not full), stores @a c in that position, increments
396 * the position, and returns @c traits::to_int_type(c). If a write
397 * position is not available, returns @c overflow(c).
398 */
399 int_type
400 sputc(char_type __c)
401 {
402 int_type __ret;
403 if (__builtin_expect(this->pptr() < this->epptr(), true))
404 {
405 *this->pptr() = __c;
406 this->pbump(1);
407 __ret = traits_type::to_int_type(__c);
408 }
409 else
410 __ret = this->overflow(traits_type::to_int_type(__c));
411 return __ret;
412 }
414 /**
415 * @brief Entry point for all single-character output functions.
416 * @param s A buffer read area.
417 * @param n A count.
418 *
419 * One of two public output functions.
420 *
421 *
422 * Returns xsputn(s,n). The effect is to write @a s[0] through
423 * @a s[n-1] to the output sequence, if possible.
424 */
425 streamsize
426 sputn(const char_type* __s, streamsize __n)
427 { return this->xsputn(__s, __n); }
429 protected:
430 /**
431 * @brief Base constructor.
432 *
433 * Only called from derived constructors, and sets up all the
434 * buffer data to zero, including the pointers described in the
435 * basic_streambuf class description. Note that, as a result,
436 * - the class starts with no read nor write positions available,
437 * - this is not an error
438 */
439 basic_streambuf()
440 : _M_in_beg(0), _M_in_cur(0), _M_in_end(0),
441 _M_out_beg(0), _M_out_cur(0), _M_out_end(0),
442 _M_buf_locale(locale())
443 { }
445 // [27.5.2.3.1] get area access
446 //@{
447 /**
448 * @brief Access to the get area.
449 *
450 * These functions are only available to other protected functions,
451 * including derived classes.
452 *
453 * - eback() returns the beginning pointer for the input sequence
454 * - gptr() returns the next pointer for the input sequence
455 * - egptr() returns the end pointer for the input sequence
456 */
457 char_type*
458 eback() const { return _M_in_beg; }
460 char_type*
461 gptr() const { return _M_in_cur; }
463 char_type*
464 egptr() const { return _M_in_end; }
465 //@}
467 /**
468 * @brief Moving the read position.
469 * @param n The delta by which to move.
470 *
471 * This just advances the read position without returning any data.
472 */
473 void
474 gbump(int __n) { _M_in_cur += __n; }
476 /**
477 * @brief Setting the three read area pointers.
478 * @param gbeg A pointer.
479 * @param gnext A pointer.
480 * @param gend A pointer.
481 * @post @a gbeg == @c eback(), @a gnext == @c gptr(), and
482 * @a gend == @c egptr()
483 */
484 void
485 setg(char_type* __gbeg, char_type* __gnext, char_type* __gend)
486 {
487 _M_in_beg = __gbeg;
488 _M_in_cur = __gnext;
489 _M_in_end = __gend;
490 }
492 // [27.5.2.3.2] put area access
493 //@{
494 /**
495 * @brief Access to the put area.
496 *
497 * These functions are only available to other protected functions,
498 * including derived classes.
499 *
500 * - pbase() returns the beginning pointer for the output sequence
501 * - pptr() returns the next pointer for the output sequence
502 * - epptr() returns the end pointer for the output sequence
503 */
504 char_type*
505 pbase() const { return _M_out_beg; }
507 char_type*
508 pptr() const { return _M_out_cur; }
510 char_type*
511 epptr() const { return _M_out_end; }
512 //@}
514 /**
515 * @brief Moving the write position.
516 * @param n The delta by which to move.
517 *
518 * This just advances the write position without returning any data.
519 */
520 void
521 pbump(int __n) { _M_out_cur += __n; }
523 /**
524 * @brief Setting the three write area pointers.
525 * @param pbeg A pointer.
526 * @param pend A pointer.
527 * @post @a pbeg == @c pbase(), @a pbeg == @c pptr(), and
528 * @a pend == @c epptr()
529 */
530 void
531 setp(char_type* __pbeg, char_type* __pend)
532 {
533 _M_out_beg = _M_out_cur = __pbeg;
534 _M_out_end = __pend;
535 }
537 // [27.5.2.4] virtual functions
538 // [27.5.2.4.1] locales
539 /**
540 * @brief Changes translations.
541 * @param loc A new locale.
542 *
543 * Translations done during I/O which depend on the current locale
544 * are changed by this call. The standard adds, "Between invocations
545 * of this function a class derived from streambuf can safely cache
546 * results of calls to locale functions and to members of facets
547 * so obtained."
548 *
549 * @note Base class version does nothing.
550 */
551 virtual void
552 imbue(const locale&)
553 { }
555 // [27.5.2.4.2] buffer management and positioning
556 /**
557 * @brief Manipulates the buffer.
558 *
559 * Each derived class provides its own appropriate behavior. See
560 * the next-to-last paragraph of
561 * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25s02.html
562 * for more on this function.
563 *
564 * @note Base class version does nothing, returns @c this.
565 */
566 virtual basic_streambuf<char_type,_Traits>*
567 setbuf(char_type*, streamsize)
568 { return this; }
570 /**
571 * @brief Alters the stream positions.
572 *
573 * Each derived class provides its own appropriate behavior.
574 * @note Base class version does nothing, returns a @c pos_type
575 * that represents an invalid stream position.
576 */
577 virtual pos_type
578 seekoff(off_type, ios_base::seekdir,
579 ios_base::openmode /*__mode*/ = ios_base::in | ios_base::out)
580 { return pos_type(off_type(-1)); }
582 /**
583 * @brief Alters the stream positions.
584 *
585 * Each derived class provides its own appropriate behavior.
586 * @note Base class version does nothing, returns a @c pos_type
587 * that represents an invalid stream position.
588 */
589 virtual pos_type
590 seekpos(pos_type,
591 ios_base::openmode /*__mode*/ = ios_base::in | ios_base::out)
592 { return pos_type(off_type(-1)); }
594 /**
595 * @brief Synchronizes the buffer arrays with the controlled sequences.
596 * @return -1 on failure.
597 *
598 * Each derived class provides its own appropriate behavior,
599 * including the definition of "failure".
600 * @note Base class version does nothing, returns zero.
601 */
602 virtual int
603 sync() { return 0; }
605 // [27.5.2.4.3] get area
606 /**
607 * @brief Investigating the data available.
608 * @return An estimate of the number of characters available in the
609 * input sequence, or -1.
610 *
611 * "If it returns a positive value, then successive calls to
612 * @c underflow() will not return @c traits::eof() until at least that
613 * number of characters have been supplied. If @c showmanyc()
614 * returns -1, then calls to @c underflow() or @c uflow() will fail."
615 * [27.5.2.4.3]/1
616 *
617 * @note Base class version does nothing, returns zero.
618 * @note The standard adds that "the intention is not only that the
619 * calls [to underflow or uflow] will not return @c eof() but
620 * that they will return "immediately".
621 * @note The standard adds that "the morphemes of @c showmanyc are
622 * "es-how-many-see", not "show-manic".
623 */
624 virtual streamsize
625 showmanyc() { return 0; }
627 /**
628 * @brief Multiple character extraction.
629 * @param s A buffer area.
630 * @param n Maximum number of characters to assign.
631 * @return The number of characters assigned.
632 *
633 * Fills @a s[0] through @a s[n-1] with characters from the input
634 * sequence, as if by @c sbumpc(). Stops when either @a n characters
635 * have been copied, or when @c traits::eof() would be copied.
636 *
637 * It is expected that derived classes provide a more efficient
638 * implementation by overriding this definition.
639 */
640 virtual streamsize
641 xsgetn(char_type* __s, streamsize __n);
643 /**
644 * @brief Fetches more data from the controlled sequence.
645 * @return The first character from the <em>pending sequence</em>.
646 *
647 * Informally, this function is called when the input buffer is
648 * exhausted (or does not exist, as buffering need not actually be
649 * done). If a buffer exists, it is "refilled". In either case, the
650 * next available character is returned, or @c traits::eof() to
651 * indicate a null pending sequence.
652 *
653 * For a formal definition of the pending sequence, see a good text
654 * such as Langer & Kreft, or [27.5.2.4.3]/7-14.
655 *
656 * A functioning input streambuf can be created by overriding only
657 * this function (no buffer area will be used). For an example, see
658 * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25.html
659 *
660 * @note Base class version does nothing, returns eof().
661 */
662 virtual int_type
663 underflow()
664 { return traits_type::eof(); }
666 /**
667 * @brief Fetches more data from the controlled sequence.
668 * @return The first character from the <em>pending sequence</em>.
669 *
670 * Informally, this function does the same thing as @c underflow(),
671 * and in fact is required to call that function. It also returns
672 * the new character, like @c underflow() does. However, this
673 * function also moves the read position forward by one.
674 */
675 virtual int_type
676 uflow()
677 {
678 int_type __ret = traits_type::eof();
679 const bool __testeof = traits_type::eq_int_type(this->underflow(),
680 __ret);
681 if (!__testeof)
682 {
683 __ret = traits_type::to_int_type(*this->gptr());
684 this->gbump(1);
685 }
686 return __ret;
687 }
689 // [27.5.2.4.4] putback
690 /**
691 * @brief Tries to back up the input sequence.
692 * @param c The character to be inserted back into the sequence.
693 * @return eof() on failure, "some other value" on success
694 * @post The constraints of @c gptr(), @c eback(), and @c pptr()
695 * are the same as for @c underflow().
696 *
697 * @note Base class version does nothing, returns eof().
698 */
699 virtual int_type
700 pbackfail(int_type /* __c */ = traits_type::eof())
701 { return traits_type::eof(); }
703 // Put area:
704 /**
705 * @brief Multiple character insertion.
706 * @param s A buffer area.
707 * @param n Maximum number of characters to write.
708 * @return The number of characters written.
709 *
710 * Writes @a s[0] through @a s[n-1] to the output sequence, as if
711 * by @c sputc(). Stops when either @a n characters have been
712 * copied, or when @c sputc() would return @c traits::eof().
713 *
714 * It is expected that derived classes provide a more efficient
715 * implementation by overriding this definition.
716 */
717 virtual streamsize
718 xsputn(const char_type* __s, streamsize __n);
720 /**
721 * @brief Consumes data from the buffer; writes to the
722 * controlled sequence.
723 * @param c An additional character to consume.
724 * @return eof() to indicate failure, something else (usually
725 * @a c, or not_eof())
726 *
727 * Informally, this function is called when the output buffer is full
728 * (or does not exist, as buffering need not actually be done). If a
729 * buffer exists, it is "consumed", with "some effect" on the
730 * controlled sequence. (Typically, the buffer is written out to the
731 * sequence verbatim.) In either case, the character @a c is also
732 * written out, if @a c is not @c eof().
733 *
734 * For a formal definition of this function, see a good text
735 * such as Langer & Kreft, or [27.5.2.4.5]/3-7.
736 *
737 * A functioning output streambuf can be created by overriding only
738 * this function (no buffer area will be used).
739 *
740 * @note Base class version does nothing, returns eof().
741 */
742 virtual int_type
743 overflow(int_type /* __c */ = traits_type::eof())
744 { return traits_type::eof(); }
746 #if _GLIBCXX_DEPRECATED
747 // Annex D.6
748 public:
749 /**
750 * @brief Tosses a character.
751 *
752 * Advances the read pointer, ignoring the character that would have
753 * been read.
754 *
755 * See http://gcc.gnu.org/ml/libstdc++/2002-05/msg00168.html
756 */
757 void
758 stossc()
759 {
760 if (this->gptr() < this->egptr())
761 this->gbump(1);
762 else
763 this->uflow();
764 }
765 #endif
767 private:
768 // _GLIBCXX_RESOLVE_LIB_DEFECTS
769 // Side effect of DR 50.
770 basic_streambuf(const __streambuf_type& __sb)
771 : _M_in_beg(__sb._M_in_beg), _M_in_cur(__sb._M_in_cur),
772 _M_in_end(__sb._M_in_end), _M_out_beg(__sb._M_out_beg),
773 _M_out_cur(__sb._M_out_cur), _M_out_end(__sb._M_out_cur),
774 _M_buf_locale(__sb._M_buf_locale)
775 { }
777 __streambuf_type&
778 operator=(const __streambuf_type&) { return *this; };
779 };
781 // Explicit specialization declarations, defined in src/streambuf.cc.
782 template<>
783 streamsize
784 __copy_streambufs_eof(basic_streambuf<char>* __sbin,
785 basic_streambuf<char>* __sbout, bool& __ineof);
786 #ifdef _GLIBCXX_USE_WCHAR_T
787 template<>
788 streamsize
789 __copy_streambufs_eof(basic_streambuf<wchar_t>* __sbin,
790 basic_streambuf<wchar_t>* __sbout, bool& __ineof);
791 #endif
793 _GLIBCXX_END_NAMESPACE
795 #ifndef _GLIBCXX_EXPORT_TEMPLATE
796 # include <bits/streambuf.tcc>
797 #endif
799 #endif /* _GLIBCXX_STREAMBUF */