1 // Iostreams base classes -*- C++ -*-
2
3 // Copyright (C) 1997-2013 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24
25 /** @file bits/ios_base.h
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{ios}
28 */
29
30 //
31 // ISO C++ 14882: 27.4 Iostreams base classes
32 //
33
34 #ifndef _IOS_BASE_H
35 #define _IOS_BASE_H 1
36
37 #pragma GCC system_header
38
39 #include <ext/atomicity.h>
40 #include <bits/localefwd.h>
41 #include <bits/locale_classes.h>
42
_GLIBCXX_VISIBILITY(default)43 namespace std _GLIBCXX_VISIBILITY(default)
44 {
45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
46
47 // The following definitions of bitmask types are enums, not ints,
48 // as permitted (but not required) in the standard, in order to provide
49 // better type safety in iostream calls. A side effect is that
50 // expressions involving them are no longer compile-time constants.
51 enum _Ios_Fmtflags
52 {
53 _S_boolalpha = 1L << 0,
54 _S_dec = 1L << 1,
55 _S_fixed = 1L << 2,
56 _S_hex = 1L << 3,
57 _S_internal = 1L << 4,
58 _S_left = 1L << 5,
59 _S_oct = 1L << 6,
60 _S_right = 1L << 7,
61 _S_scientific = 1L << 8,
62 _S_showbase = 1L << 9,
63 _S_showpoint = 1L << 10,
64 _S_showpos = 1L << 11,
65 _S_skipws = 1L << 12,
66 _S_unitbuf = 1L << 13,
67 _S_uppercase = 1L << 14,
68 _S_adjustfield = _S_left | _S_right | _S_internal,
69 _S_basefield = _S_dec | _S_oct | _S_hex,
70 _S_floatfield = _S_scientific | _S_fixed,
71 _S_ios_fmtflags_end = 1L << 16
72 };
73
74 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags
75 operator&(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
76 { return _Ios_Fmtflags(static_cast<int>(__a) & static_cast<int>(__b)); }
77
78 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags
79 operator|(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
80 { return _Ios_Fmtflags(static_cast<int>(__a) | static_cast<int>(__b)); }
81
82 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags
83 operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
84 { return _Ios_Fmtflags(static_cast<int>(__a) ^ static_cast<int>(__b)); }
85
86 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags
87 operator~(_Ios_Fmtflags __a)
88 { return _Ios_Fmtflags(~static_cast<int>(__a)); }
89
90 inline const _Ios_Fmtflags&
91 operator|=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
92 { return __a = __a | __b; }
93
94 inline const _Ios_Fmtflags&
95 operator&=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
96 { return __a = __a & __b; }
97
98 inline const _Ios_Fmtflags&
99 operator^=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
100 { return __a = __a ^ __b; }
101
102
103 enum _Ios_Openmode
104 {
105 _S_app = 1L << 0,
106 _S_ate = 1L << 1,
107 _S_bin = 1L << 2,
108 _S_in = 1L << 3,
109 _S_out = 1L << 4,
110 _S_trunc = 1L << 5,
111 _S_ios_openmode_end = 1L << 16
112 };
113
114 inline _GLIBCXX_CONSTEXPR _Ios_Openmode
115 operator&(_Ios_Openmode __a, _Ios_Openmode __b)
116 { return _Ios_Openmode(static_cast<int>(__a) & static_cast<int>(__b)); }
117
118 inline _GLIBCXX_CONSTEXPR _Ios_Openmode
119 operator|(_Ios_Openmode __a, _Ios_Openmode __b)
120 { return _Ios_Openmode(static_cast<int>(__a) | static_cast<int>(__b)); }
121
122 inline _GLIBCXX_CONSTEXPR _Ios_Openmode
123 operator^(_Ios_Openmode __a, _Ios_Openmode __b)
124 { return _Ios_Openmode(static_cast<int>(__a) ^ static_cast<int>(__b)); }
125
126 inline _GLIBCXX_CONSTEXPR _Ios_Openmode
127 operator~(_Ios_Openmode __a)
128 { return _Ios_Openmode(~static_cast<int>(__a)); }
129
130 inline const _Ios_Openmode&
131 operator|=(_Ios_Openmode& __a, _Ios_Openmode __b)
132 { return __a = __a | __b; }
133
134 inline const _Ios_Openmode&
135 operator&=(_Ios_Openmode& __a, _Ios_Openmode __b)
136 { return __a = __a & __b; }
137
138 inline const _Ios_Openmode&
139 operator^=(_Ios_Openmode& __a, _Ios_Openmode __b)
140 { return __a = __a ^ __b; }
141
142
143 enum _Ios_Iostate
144 {
145 _S_goodbit = 0,
146 _S_badbit = 1L << 0,
147 _S_eofbit = 1L << 1,
148 _S_failbit = 1L << 2,
149 _S_ios_iostate_end = 1L << 16
150 };
151
152 inline _GLIBCXX_CONSTEXPR _Ios_Iostate
153 operator&(_Ios_Iostate __a, _Ios_Iostate __b)
154 { return _Ios_Iostate(static_cast<int>(__a) & static_cast<int>(__b)); }
155
156 inline _GLIBCXX_CONSTEXPR _Ios_Iostate
157 operator|(_Ios_Iostate __a, _Ios_Iostate __b)
158 { return _Ios_Iostate(static_cast<int>(__a) | static_cast<int>(__b)); }
159
160 inline _GLIBCXX_CONSTEXPR _Ios_Iostate
161 operator^(_Ios_Iostate __a, _Ios_Iostate __b)
162 { return _Ios_Iostate(static_cast<int>(__a) ^ static_cast<int>(__b)); }
163
164 inline _GLIBCXX_CONSTEXPR _Ios_Iostate
165 operator~(_Ios_Iostate __a)
166 { return _Ios_Iostate(~static_cast<int>(__a)); }
167
168 inline const _Ios_Iostate&
169 operator|=(_Ios_Iostate& __a, _Ios_Iostate __b)
170 { return __a = __a | __b; }
171
172 inline const _Ios_Iostate&
173 operator&=(_Ios_Iostate& __a, _Ios_Iostate __b)
174 { return __a = __a & __b; }
175
176 inline const _Ios_Iostate&
177 operator^=(_Ios_Iostate& __a, _Ios_Iostate __b)
178 { return __a = __a ^ __b; }
179
180
181 enum _Ios_Seekdir
182 {
183 _S_beg = 0,
184 _S_cur = _GLIBCXX_STDIO_SEEK_CUR,
185 _S_end = _GLIBCXX_STDIO_SEEK_END,
186 _S_ios_seekdir_end = 1L << 16
187 };
188
189 // 27.4.2 Class ios_base
190 /**
191 * @brief The base of the I/O class hierarchy.
192 * @ingroup io
193 *
194 * This class defines everything that can be defined about I/O that does
195 * not depend on the type of characters being input or output. Most
196 * people will only see @c ios_base when they need to specify the full
197 * name of the various I/O flags (e.g., the openmodes).
198 */
199 class ios_base
200 {
201 public:
202
203 /**
204 * @brief These are thrown to indicate problems with io.
205 * @ingroup exceptions
206 *
207 * 27.4.2.1.1 Class ios_base::failure
208 */
209 class failure : public exception
210 {
211 public:
212 // _GLIBCXX_RESOLVE_LIB_DEFECTS
213 // 48. Use of non-existent exception constructor
214 explicit
215 failure(const string& __str) throw();
216
217 // This declaration is not useless:
218 // http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/Vague-Linkage.html
219 virtual
220 ~failure() throw();
221
222 virtual const char*
223 what() const throw();
224
225 private:
226 string _M_msg;
227 };
228
229 // 27.4.2.1.2 Type ios_base::fmtflags
230 /**
231 * @brief This is a bitmask type.
232 *
233 * @c @a _Ios_Fmtflags is implementation-defined, but it is valid to
234 * perform bitwise operations on these values and expect the Right
235 * Thing to happen. Defined objects of type fmtflags are:
236 * - boolalpha
237 * - dec
238 * - fixed
239 * - hex
240 * - internal
241 * - left
242 * - oct
243 * - right
244 * - scientific
245 * - showbase
246 * - showpoint
247 * - showpos
248 * - skipws
249 * - unitbuf
250 * - uppercase
251 * - adjustfield
252 * - basefield
253 * - floatfield
254 */
255 typedef _Ios_Fmtflags fmtflags;
256
257 /// Insert/extract @c bool in alphabetic rather than numeric format.
258 static const fmtflags boolalpha = _S_boolalpha;
259
260 /// Converts integer input or generates integer output in decimal base.
261 static const fmtflags dec = _S_dec;
262
263 /// Generate floating-point output in fixed-point notation.
264 static const fmtflags fixed = _S_fixed;
265
266 /// Converts integer input or generates integer output in hexadecimal base.
267 static const fmtflags hex = _S_hex;
268
269 /// Adds fill characters at a designated internal point in certain
270 /// generated output, or identical to @c right if no such point is
271 /// designated.
272 static const fmtflags internal = _S_internal;
273
274 /// Adds fill characters on the right (final positions) of certain
275 /// generated output. (I.e., the thing you print is flush left.)
276 static const fmtflags left = _S_left;
277
278 /// Converts integer input or generates integer output in octal base.
279 static const fmtflags oct = _S_oct;
280
281 /// Adds fill characters on the left (initial positions) of certain
282 /// generated output. (I.e., the thing you print is flush right.)
283 static const fmtflags right = _S_right;
284
285 /// Generates floating-point output in scientific notation.
286 static const fmtflags scientific = _S_scientific;
287
288 /// Generates a prefix indicating the numeric base of generated integer
289 /// output.
290 static const fmtflags showbase = _S_showbase;
291
292 /// Generates a decimal-point character unconditionally in generated
293 /// floating-point output.
294 static const fmtflags showpoint = _S_showpoint;
295
296 /// Generates a + sign in non-negative generated numeric output.
297 static const fmtflags showpos = _S_showpos;
298
299 /// Skips leading white space before certain input operations.
300 static const fmtflags skipws = _S_skipws;
301
302 /// Flushes output after each output operation.
303 static const fmtflags unitbuf = _S_unitbuf;
304
305 /// Replaces certain lowercase letters with their uppercase equivalents
306 /// in generated output.
307 static const fmtflags uppercase = _S_uppercase;
308
309 /// A mask of left|right|internal. Useful for the 2-arg form of @c setf.
310 static const fmtflags adjustfield = _S_adjustfield;
311
312 /// A mask of dec|oct|hex. Useful for the 2-arg form of @c setf.
313 static const fmtflags basefield = _S_basefield;
314
315 /// A mask of scientific|fixed. Useful for the 2-arg form of @c setf.
316 static const fmtflags floatfield = _S_floatfield;
317
318 // 27.4.2.1.3 Type ios_base::iostate
319 /**
320 * @brief This is a bitmask type.
321 *
322 * @c @a _Ios_Iostate is implementation-defined, but it is valid to
323 * perform bitwise operations on these values and expect the Right
324 * Thing to happen. Defined objects of type iostate are:
325 * - badbit
326 * - eofbit
327 * - failbit
328 * - goodbit
329 */
330 typedef _Ios_Iostate iostate;
331
332 /// Indicates a loss of integrity in an input or output sequence (such
333 /// as an irrecoverable read error from a file).
334 static const iostate badbit = _S_badbit;
335
336 /// Indicates that an input operation reached the end of an input sequence.
337 static const iostate eofbit = _S_eofbit;
338
339 /// Indicates that an input operation failed to read the expected
340 /// characters, or that an output operation failed to generate the
341 /// desired characters.
342 static const iostate failbit = _S_failbit;
343
344 /// Indicates all is well.
345 static const iostate goodbit = _S_goodbit;
346
347 // 27.4.2.1.4 Type ios_base::openmode
348 /**
349 * @brief This is a bitmask type.
350 *
351 * @c @a _Ios_Openmode is implementation-defined, but it is valid to
352 * perform bitwise operations on these values and expect the Right
353 * Thing to happen. Defined objects of type openmode are:
354 * - app
355 * - ate
356 * - binary
357 * - in
358 * - out
359 * - trunc
360 */
361 typedef _Ios_Openmode openmode;
362
363 /// Seek to end before each write.
364 static const openmode app = _S_app;
365
366 /// Open and seek to end immediately after opening.
367 static const openmode ate = _S_ate;
368
369 /// Perform input and output in binary mode (as opposed to text mode).
370 /// This is probably not what you think it is; see
371 /// http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch27s02.html
372 static const openmode binary = _S_bin;
373
374 /// Open for input. Default for @c ifstream and fstream.
375 static const openmode in = _S_in;
376
377 /// Open for output. Default for @c ofstream and fstream.
378 static const openmode out = _S_out;
379
380 /// Open for input. Default for @c ofstream.
381 static const openmode trunc = _S_trunc;
382
383 // 27.4.2.1.5 Type ios_base::seekdir
384 /**
385 * @brief This is an enumerated type.
386 *
387 * @c @a _Ios_Seekdir is implementation-defined. Defined values
388 * of type seekdir are:
389 * - beg
390 * - cur, equivalent to @c SEEK_CUR in the C standard library.
391 * - end, equivalent to @c SEEK_END in the C standard library.
392 */
393 typedef _Ios_Seekdir seekdir;
394
395 /// Request a seek relative to the beginning of the stream.
396 static const seekdir beg = _S_beg;
397
398 /// Request a seek relative to the current position within the sequence.
399 static const seekdir cur = _S_cur;
400
401 /// Request a seek relative to the current end of the sequence.
402 static const seekdir end = _S_end;
403
404 // Annex D.6
405 typedef int io_state;
406 typedef int open_mode;
407 typedef int seek_dir;
408
409 typedef std::streampos streampos;
410 typedef std::streamoff streamoff;
411
412 // Callbacks;
413 /**
414 * @brief The set of events that may be passed to an event callback.
415 *
416 * erase_event is used during ~ios() and copyfmt(). imbue_event is used
417 * during imbue(). copyfmt_event is used during copyfmt().
418 */
419 enum event
420 {
421 erase_event,
422 imbue_event,
423 copyfmt_event
424 };
425
426 /**
427 * @brief The type of an event callback function.
428 * @param __e One of the members of the event enum.
429 * @param __b Reference to the ios_base object.
430 * @param __i The integer provided when the callback was registered.
431 *
432 * Event callbacks are user defined functions that get called during
433 * several ios_base and basic_ios functions, specifically imbue(),
434 * copyfmt(), and ~ios().
435 */
436 typedef void (*event_callback) (event __e, ios_base& __b, int __i);
437
438 /**
439 * @brief Add the callback __fn with parameter __index.
440 * @param __fn The function to add.
441 * @param __index The integer to pass to the function when invoked.
442 *
443 * Registers a function as an event callback with an integer parameter to
444 * be passed to the function when invoked. Multiple copies of the
445 * function are allowed. If there are multiple callbacks, they are
446 * invoked in the order they were registered.
447 */
448 void
449 register_callback(event_callback __fn, int __index);
450
451 protected:
452 streamsize _M_precision;
453 streamsize _M_width;
454 fmtflags _M_flags;
455 iostate _M_exception;
456 iostate _M_streambuf_state;
457
458 // 27.4.2.6 Members for callbacks
459 // 27.4.2.6 ios_base callbacks
460 struct _Callback_list
461 {
462 // Data Members
463 _Callback_list* _M_next;
464 ios_base::event_callback _M_fn;
465 int _M_index;
466 _Atomic_word _M_refcount; // 0 means one reference.
467
468 _Callback_list(ios_base::event_callback __fn, int __index,
469 _Callback_list* __cb)
470 : _M_next(__cb), _M_fn(__fn), _M_index(__index), _M_refcount(0) { }
471
472 void
473 _M_add_reference() { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); }
474
475 // 0 => OK to delete.
476 int
477 _M_remove_reference()
478 {
479 // Be race-detector-friendly. For more info see bits/c++config.
480 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount);
481 int __res = __gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1);
482 if (__res == 0)
483 {
484 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount);
485 }
486 return __res;
487 }
488 };
489
490 _Callback_list* _M_callbacks;
491
492 void
493 _M_call_callbacks(event __ev) throw();
494
495 void
496 _M_dispose_callbacks(void) throw();
497
498 // 27.4.2.5 Members for iword/pword storage
499 struct _Words
500 {
501 void* _M_pword;
502 long _M_iword;
503 _Words() : _M_pword(0), _M_iword(0) { }
504 };
505
506 // Only for failed iword/pword calls.
507 _Words _M_word_zero;
508
509 // Guaranteed storage.
510 // The first 5 iword and pword slots are reserved for internal use.
511 enum { _S_local_word_size = 8 };
512 _Words _M_local_word[_S_local_word_size];
513
514 // Allocated storage.
515 int _M_word_size;
516 _Words* _M_word;
517
518 _Words&
519 _M_grow_words(int __index, bool __iword);
520
521 // Members for locale and locale caching.
522 locale _M_ios_locale;
523
524 void
525 _M_init() throw();
526
527 public:
528
529 // 27.4.2.1.6 Class ios_base::Init
530 // Used to initialize standard streams. In theory, g++ could use
531 // -finit-priority to order this stuff correctly without going
532 // through these machinations.
533 class Init
534 {
535 friend class ios_base;
536 public:
537 Init();
538 ~Init();
539
540 private:
541 static _Atomic_word _S_refcount;
542 static bool _S_synced_with_stdio;
543 };
544
545 // [27.4.2.2] fmtflags state functions
546 /**
547 * @brief Access to format flags.
548 * @return The format control flags for both input and output.
549 */
550 fmtflags
551 flags() const
552 { return _M_flags; }
553
554 /**
555 * @brief Setting new format flags all at once.
556 * @param __fmtfl The new flags to set.
557 * @return The previous format control flags.
558 *
559 * This function overwrites all the format flags with @a __fmtfl.
560 */
561 fmtflags
562 flags(fmtflags __fmtfl)
563 {
564 fmtflags __old = _M_flags;
565 _M_flags = __fmtfl;
566 return __old;
567 }
568
569 /**
570 * @brief Setting new format flags.
571 * @param __fmtfl Additional flags to set.
572 * @return The previous format control flags.
573 *
574 * This function sets additional flags in format control. Flags that
575 * were previously set remain set.
576 */
577 fmtflags
578 setf(fmtflags __fmtfl)
579 {
580 fmtflags __old = _M_flags;
581 _M_flags |= __fmtfl;
582 return __old;
583 }
584
585 /**
586 * @brief Setting new format flags.
587 * @param __fmtfl Additional flags to set.
588 * @param __mask The flags mask for @a fmtfl.
589 * @return The previous format control flags.
590 *
591 * This function clears @a mask in the format flags, then sets
592 * @a fmtfl @c & @a mask. An example mask is @c ios_base::adjustfield.
593 */
594 fmtflags
595 setf(fmtflags __fmtfl, fmtflags __mask)
596 {
597 fmtflags __old = _M_flags;
598 _M_flags &= ~__mask;
599 _M_flags |= (__fmtfl & __mask);
600 return __old;
601 }
602
603 /**
604 * @brief Clearing format flags.
605 * @param __mask The flags to unset.
606 *
607 * This function clears @a __mask in the format flags.
608 */
609 void
610 unsetf(fmtflags __mask)
611 { _M_flags &= ~__mask; }
612
613 /**
614 * @brief Flags access.
615 * @return The precision to generate on certain output operations.
616 *
617 * Be careful if you try to give a definition of @a precision here; see
618 * DR 189.
619 */
620 streamsize
621 precision() const
622 { return _M_precision; }
623
624 /**
625 * @brief Changing flags.
626 * @param __prec The new precision value.
627 * @return The previous value of precision().
628 */
629 streamsize
630 precision(streamsize __prec)
631 {
632 streamsize __old = _M_precision;
633 _M_precision = __prec;
634 return __old;
635 }
636
637 /**
638 * @brief Flags access.
639 * @return The minimum field width to generate on output operations.
640 *
641 * <em>Minimum field width</em> refers to the number of characters.
642 */
643 streamsize
644 width() const
645 { return _M_width; }
646
647 /**
648 * @brief Changing flags.
649 * @param __wide The new width value.
650 * @return The previous value of width().
651 */
652 streamsize
653 width(streamsize __wide)
654 {
655 streamsize __old = _M_width;
656 _M_width = __wide;
657 return __old;
658 }
659
660 // [27.4.2.4] ios_base static members
661 /**
662 * @brief Interaction with the standard C I/O objects.
663 * @param __sync Whether to synchronize or not.
664 * @return True if the standard streams were previously synchronized.
665 *
666 * The synchronization referred to is @e only that between the standard
667 * C facilities (e.g., stdout) and the standard C++ objects (e.g.,
668 * cout). User-declared streams are unaffected. See
669 * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch28s02.html
670 */
671 static bool
672 sync_with_stdio(bool __sync = true);
673
674 // [27.4.2.3] ios_base locale functions
675 /**
676 * @brief Setting a new locale.
677 * @param __loc The new locale.
678 * @return The previous locale.
679 *
680 * Sets the new locale for this stream, and then invokes each callback
681 * with imbue_event.
682 */
683 locale
684 imbue(const locale& __loc) throw();
685
686 /**
687 * @brief Locale access
688 * @return A copy of the current locale.
689 *
690 * If @c imbue(loc) has previously been called, then this function
691 * returns @c loc. Otherwise, it returns a copy of @c std::locale(),
692 * the global C++ locale.
693 */
694 locale
695 getloc() const
696 { return _M_ios_locale; }
697
698 /**
699 * @brief Locale access
700 * @return A reference to the current locale.
701 *
702 * Like getloc above, but returns a reference instead of
703 * generating a copy.
704 */
705 const locale&
706 _M_getloc() const
707 { return _M_ios_locale; }
708
709 // [27.4.2.5] ios_base storage functions
710 /**
711 * @brief Access to unique indices.
712 * @return An integer different from all previous calls.
713 *
714 * This function returns a unique integer every time it is called. It
715 * can be used for any purpose, but is primarily intended to be a unique
716 * index for the iword and pword functions. The expectation is that an
717 * application calls xalloc in order to obtain an index in the iword and
718 * pword arrays that can be used without fear of conflict.
719 *
720 * The implementation maintains a static variable that is incremented and
721 * returned on each invocation. xalloc is guaranteed to return an index
722 * that is safe to use in the iword and pword arrays.
723 */
724 static int
725 xalloc() throw();
726
727 /**
728 * @brief Access to integer array.
729 * @param __ix Index into the array.
730 * @return A reference to an integer associated with the index.
731 *
732 * The iword function provides access to an array of integers that can be
733 * used for any purpose. The array grows as required to hold the
734 * supplied index. All integers in the array are initialized to 0.
735 *
736 * The implementation reserves several indices. You should use xalloc to
737 * obtain an index that is safe to use. Also note that since the array
738 * can grow dynamically, it is not safe to hold onto the reference.
739 */
740 long&
741 iword(int __ix)
742 {
743 _Words& __word = (__ix < _M_word_size)
744 ? _M_word[__ix] : _M_grow_words(__ix, true);
745 return __word._M_iword;
746 }
747
748 /**
749 * @brief Access to void pointer array.
750 * @param __ix Index into the array.
751 * @return A reference to a void* associated with the index.
752 *
753 * The pword function provides access to an array of pointers that can be
754 * used for any purpose. The array grows as required to hold the
755 * supplied index. All pointers in the array are initialized to 0.
756 *
757 * The implementation reserves several indices. You should use xalloc to
758 * obtain an index that is safe to use. Also note that since the array
759 * can grow dynamically, it is not safe to hold onto the reference.
760 */
761 void*&
762 pword(int __ix)
763 {
764 _Words& __word = (__ix < _M_word_size)
765 ? _M_word[__ix] : _M_grow_words(__ix, false);
766 return __word._M_pword;
767 }
768
769 // Destructor
770 /**
771 * Invokes each callback with erase_event. Destroys local storage.
772 *
773 * Note that the ios_base object for the standard streams never gets
774 * destroyed. As a result, any callbacks registered with the standard
775 * streams will not get invoked with erase_event (unless copyfmt is
776 * used).
777 */
778 virtual ~ios_base();
779
780 protected:
781 ios_base() throw ();
782
783 // _GLIBCXX_RESOLVE_LIB_DEFECTS
784 // 50. Copy constructor and assignment operator of ios_base
785 private:
786 ios_base(const ios_base&);
787
788 ios_base&
789 operator=(const ios_base&);
790 };
791
792 // [27.4.5.1] fmtflags manipulators
793 /// Calls base.setf(ios_base::boolalpha).
794 inline ios_base&
795 boolalpha(ios_base& __base)
796 {
797 __base.setf(ios_base::boolalpha);
798 return __base;
799 }
800
801 /// Calls base.unsetf(ios_base::boolalpha).
802 inline ios_base&
803 noboolalpha(ios_base& __base)
804 {
805 __base.unsetf(ios_base::boolalpha);
806 return __base;
807 }
808
809 /// Calls base.setf(ios_base::showbase).
810 inline ios_base&
811 showbase(ios_base& __base)
812 {
813 __base.setf(ios_base::showbase);
814 return __base;
815 }
816
817 /// Calls base.unsetf(ios_base::showbase).
818 inline ios_base&
819 noshowbase(ios_base& __base)
820 {
821 __base.unsetf(ios_base::showbase);
822 return __base;
823 }
824
825 /// Calls base.setf(ios_base::showpoint).
826 inline ios_base&
827 showpoint(ios_base& __base)
828 {
829 __base.setf(ios_base::showpoint);
830 return __base;
831 }
832
833 /// Calls base.unsetf(ios_base::showpoint).
834 inline ios_base&
835 noshowpoint(ios_base& __base)
836 {
837 __base.unsetf(ios_base::showpoint);
838 return __base;
839 }
840
841 /// Calls base.setf(ios_base::showpos).
842 inline ios_base&
843 showpos(ios_base& __base)
844 {
845 __base.setf(ios_base::showpos);
846 return __base;
847 }
848
849 /// Calls base.unsetf(ios_base::showpos).
850 inline ios_base&
851 noshowpos(ios_base& __base)
852 {
853 __base.unsetf(ios_base::showpos);
854 return __base;
855 }
856
857 /// Calls base.setf(ios_base::skipws).
858 inline ios_base&
859 skipws(ios_base& __base)
860 {
861 __base.setf(ios_base::skipws);
862 return __base;
863 }
864
865 /// Calls base.unsetf(ios_base::skipws).
866 inline ios_base&
867 noskipws(ios_base& __base)
868 {
869 __base.unsetf(ios_base::skipws);
870 return __base;
871 }
872
873 /// Calls base.setf(ios_base::uppercase).
874 inline ios_base&
875 uppercase(ios_base& __base)
876 {
877 __base.setf(ios_base::uppercase);
878 return __base;
879 }
880
881 /// Calls base.unsetf(ios_base::uppercase).
882 inline ios_base&
883 nouppercase(ios_base& __base)
884 {
885 __base.unsetf(ios_base::uppercase);
886 return __base;
887 }
888
889 /// Calls base.setf(ios_base::unitbuf).
890 inline ios_base&
891 unitbuf(ios_base& __base)
892 {
893 __base.setf(ios_base::unitbuf);
894 return __base;
895 }
896
897 /// Calls base.unsetf(ios_base::unitbuf).
898 inline ios_base&
899 nounitbuf(ios_base& __base)
900 {
901 __base.unsetf(ios_base::unitbuf);
902 return __base;
903 }
904
905 // [27.4.5.2] adjustfield manipulators
906 /// Calls base.setf(ios_base::internal, ios_base::adjustfield).
907 inline ios_base&
908 internal(ios_base& __base)
909 {
910 __base.setf(ios_base::internal, ios_base::adjustfield);
911 return __base;
912 }
913
914 /// Calls base.setf(ios_base::left, ios_base::adjustfield).
915 inline ios_base&
916 left(ios_base& __base)
917 {
918 __base.setf(ios_base::left, ios_base::adjustfield);
919 return __base;
920 }
921
922 /// Calls base.setf(ios_base::right, ios_base::adjustfield).
923 inline ios_base&
924 right(ios_base& __base)
925 {
926 __base.setf(ios_base::right, ios_base::adjustfield);
927 return __base;
928 }
929
930 // [27.4.5.3] basefield manipulators
931 /// Calls base.setf(ios_base::dec, ios_base::basefield).
932 inline ios_base&
933 dec(ios_base& __base)
934 {
935 __base.setf(ios_base::dec, ios_base::basefield);
936 return __base;
937 }
938
939 /// Calls base.setf(ios_base::hex, ios_base::basefield).
940 inline ios_base&
941 hex(ios_base& __base)
942 {
943 __base.setf(ios_base::hex, ios_base::basefield);
944 return __base;
945 }
946
947 /// Calls base.setf(ios_base::oct, ios_base::basefield).
948 inline ios_base&
949 oct(ios_base& __base)
950 {
951 __base.setf(ios_base::oct, ios_base::basefield);
952 return __base;
953 }
954
955 // [27.4.5.4] floatfield manipulators
956 /// Calls base.setf(ios_base::fixed, ios_base::floatfield).
957 inline ios_base&
958 fixed(ios_base& __base)
959 {
960 __base.setf(ios_base::fixed, ios_base::floatfield);
961 return __base;
962 }
963
964 /// Calls base.setf(ios_base::scientific, ios_base::floatfield).
965 inline ios_base&
966 scientific(ios_base& __base)
967 {
968 __base.setf(ios_base::scientific, ios_base::floatfield);
969 return __base;
970 }
971
972 _GLIBCXX_END_NAMESPACE_VERSION
973 } // namespace
974
975 #endif /* _IOS_BASE_H */
976