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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 :
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 0 : { 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 0 : { 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 0 : { return __a = __a | __b; }
93 :
94 : inline const _Ios_Fmtflags&
95 : operator&=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
96 0 : { 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 0 : operator&(_Ios_Openmode __a, _Ios_Openmode __b)
116 0 : { return _Ios_Openmode(static_cast<int>(__a) & static_cast<int>(__b)); }
117 :
118 : inline _GLIBCXX_CONSTEXPR _Ios_Openmode
119 1180 : operator|(_Ios_Openmode __a, _Ios_Openmode __b)
120 1180 : { 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 0 : operator&(_Ios_Iostate __a, _Ios_Iostate __b)
154 0 : { return _Ios_Iostate(static_cast<int>(__a) & static_cast<int>(__b)); }
155 :
156 : inline _GLIBCXX_CONSTEXPR _Ios_Iostate
157 0 : operator|(_Ios_Iostate __a, _Ios_Iostate __b)
158 0 : { 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 0 : fmtflags __old = _M_flags;
598 0 : _M_flags &= ~__mask;
599 0 : _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 0 : { _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 0 : streamsize __old = _M_width;
656 0 : _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 0 : noshowbase(ios_base& __base)
820 : {
821 : __base.unsetf(ios_base::showbase);
822 0 : 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 */
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