1 // Iostreams base classes -*- C++ -*- 2 3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 4 // 2006, 2007, 2008, 2009, 2010 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional 19 // permissions described in the GCC Runtime Library Exception, version 20 // 3.1, as published by the Free Software Foundation. 21 22 // You should have received a copy of the GNU General Public License and 23 // a copy of the GCC Runtime Library Exception along with this program; 24 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 25 // <http://www.gnu.org/licenses/>. 26 27 /** @file bits/ios_base.h 28 * This is an internal header file, included by other library headers. 29 * Do not attempt to use it directly. @headername{ios} 30 */ 31 32 // 33 // ISO C++ 14882: 27.4 Iostreams base classes 34 // 35 36 #ifndef _IOS_BASE_H 37 #define _IOS_BASE_H 1 38 39 #pragma GCC system_header 40 41 #include <ext/atomicity.h> 42 #include <bits/localefwd.h> 43 #include <bits/locale_classes.h> 44 45 namespace std _GLIBCXX_VISIBILITY(default) 46 { 47 _GLIBCXX_BEGIN_NAMESPACE_VERSION 48 49 // The following definitions of bitmask types are enums, not ints, 50 // as permitted (but not required) in the standard, in order to provide 51 // better type safety in iostream calls. A side effect is that 52 // expressions involving them are no longer compile-time constants. 53 enum _Ios_Fmtflags 54 { 55 _S_boolalpha = 1L << 0, 56 _S_dec = 1L << 1, 57 _S_fixed = 1L << 2, 58 _S_hex = 1L << 3, 59 _S_internal = 1L << 4, 60 _S_left = 1L << 5, 61 _S_oct = 1L << 6, 62 _S_right = 1L << 7, 63 _S_scientific = 1L << 8, 64 _S_showbase = 1L << 9, 65 _S_showpoint = 1L << 10, 66 _S_showpos = 1L << 11, 67 _S_skipws = 1L << 12, 68 _S_unitbuf = 1L << 13, 69 _S_uppercase = 1L << 14, 70 _S_adjustfield = _S_left | _S_right | _S_internal, 71 _S_basefield = _S_dec | _S_oct | _S_hex, 72 _S_floatfield = _S_scientific | _S_fixed, 73 _S_ios_fmtflags_end = 1L << 16 74 }; 75 76 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags 77 operator&(_Ios_Fmtflags __a, _Ios_Fmtflags __b) 78 { return _Ios_Fmtflags(static_cast<int>(__a) & static_cast<int>(__b)); } 79 80 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags 81 operator|(_Ios_Fmtflags __a, _Ios_Fmtflags __b) 82 { return _Ios_Fmtflags(static_cast<int>(__a) | static_cast<int>(__b)); } 83 84 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags 85 operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b) 86 { return _Ios_Fmtflags(static_cast<int>(__a) ^ static_cast<int>(__b)); } 87 88 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags 89 operator~(_Ios_Fmtflags __a) 90 { return _Ios_Fmtflags(~static_cast<int>(__a)); } 91 92 inline const _Ios_Fmtflags& 93 operator|=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 94 { return __a = __a | __b; } 95 96 inline const _Ios_Fmtflags& 97 operator&=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 98 { return __a = __a & __b; } 99 100 inline const _Ios_Fmtflags& 101 operator^=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 102 { return __a = __a ^ __b; } 103 104 105 enum _Ios_Openmode 106 { 107 _S_app = 1L << 0, 108 _S_ate = 1L << 1, 109 _S_bin = 1L << 2, 110 _S_in = 1L << 3, 111 _S_out = 1L << 4, 112 _S_trunc = 1L << 5, 113 _S_ios_openmode_end = 1L << 16 114 }; 115 116 inline _GLIBCXX_CONSTEXPR _Ios_Openmode 117 operator&(_Ios_Openmode __a, _Ios_Openmode __b) 118 { return _Ios_Openmode(static_cast<int>(__a) & static_cast<int>(__b)); } 119 120 inline _GLIBCXX_CONSTEXPR _Ios_Openmode 121 operator|(_Ios_Openmode __a, _Ios_Openmode __b) 122 { return _Ios_Openmode(static_cast<int>(__a) | static_cast<int>(__b)); } 123 124 inline _GLIBCXX_CONSTEXPR _Ios_Openmode 125 operator^(_Ios_Openmode __a, _Ios_Openmode __b) 126 { return _Ios_Openmode(static_cast<int>(__a) ^ static_cast<int>(__b)); } 127 128 inline _GLIBCXX_CONSTEXPR _Ios_Openmode 129 operator~(_Ios_Openmode __a) 130 { return _Ios_Openmode(~static_cast<int>(__a)); } 131 132 inline const _Ios_Openmode& 133 operator|=(_Ios_Openmode& __a, _Ios_Openmode __b) 134 { return __a = __a | __b; } 135 136 inline const _Ios_Openmode& 137 operator&=(_Ios_Openmode& __a, _Ios_Openmode __b) 138 { return __a = __a & __b; } 139 140 inline const _Ios_Openmode& 141 operator^=(_Ios_Openmode& __a, _Ios_Openmode __b) 142 { return __a = __a ^ __b; } 143 144 145 enum _Ios_Iostate 146 { 147 _S_goodbit = 0, 148 _S_badbit = 1L << 0, 149 _S_eofbit = 1L << 1, 150 _S_failbit = 1L << 2, 151 _S_ios_iostate_end = 1L << 16 152 }; 153 154 inline _GLIBCXX_CONSTEXPR _Ios_Iostate 155 operator&(_Ios_Iostate __a, _Ios_Iostate __b) 156 { return _Ios_Iostate(static_cast<int>(__a) & static_cast<int>(__b)); } 157 158 inline _GLIBCXX_CONSTEXPR _Ios_Iostate 159 operator|(_Ios_Iostate __a, _Ios_Iostate __b) 160 { return _Ios_Iostate(static_cast<int>(__a) | static_cast<int>(__b)); } 161 162 inline _GLIBCXX_CONSTEXPR _Ios_Iostate 163 operator^(_Ios_Iostate __a, _Ios_Iostate __b) 164 { return _Ios_Iostate(static_cast<int>(__a) ^ static_cast<int>(__b)); } 165 166 inline _GLIBCXX_CONSTEXPR _Ios_Iostate 167 operator~(_Ios_Iostate __a) 168 { return _Ios_Iostate(~static_cast<int>(__a)); } 169 170 inline const _Ios_Iostate& 171 operator|=(_Ios_Iostate& __a, _Ios_Iostate __b) 172 { return __a = __a | __b; } 173 174 inline const _Ios_Iostate& 175 operator&=(_Ios_Iostate& __a, _Ios_Iostate __b) 176 { return __a = __a & __b; } 177 178 inline const _Ios_Iostate& 179 operator^=(_Ios_Iostate& __a, _Ios_Iostate __b) 180 { return __a = __a ^ __b; } 181 182 183 enum _Ios_Seekdir 184 { 185 _S_beg = 0, 186 _S_cur = _GLIBCXX_STDIO_SEEK_CUR, 187 _S_end = _GLIBCXX_STDIO_SEEK_END, 188 _S_ios_seekdir_end = 1L << 16 189 }; 190 191 // 27.4.2 Class ios_base 192 /** 193 * @brief The base of the I/O class hierarchy. 194 * @ingroup io 195 * 196 * This class defines everything that can be defined about I/O that does 197 * not depend on the type of characters being input or output. Most 198 * people will only see @c ios_base when they need to specify the full 199 * name of the various I/O flags (e.g., the openmodes). 200 */ 201 class ios_base 202 { 203 public: 204 205 /** 206 * @brief These are thrown to indicate problems with io. 207 * @ingroup exceptions 208 * 209 * 27.4.2.1.1 Class ios_base::failure 210 */ 211 class failure : public exception 212 { 213 public: 214 // _GLIBCXX_RESOLVE_LIB_DEFECTS 215 // 48. Use of non-existent exception constructor 216 explicit 217 failure(const string& __str) throw(); 218 219 // This declaration is not useless: 220 // http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/Vague-Linkage.html 221 virtual 222 ~failure() throw(); 223 224 virtual const char* 225 what() const throw(); 226 227 private: 228 string _M_msg; 229 }; 230 231 // 27.4.2.1.2 Type ios_base::fmtflags 232 /** 233 * @brief This is a bitmask type. 234 * 235 * @c @a _Ios_Fmtflags is implementation-defined, but it is valid to 236 * perform bitwise operations on these values and expect the Right 237 * Thing to happen. Defined objects of type fmtflags are: 238 * - boolalpha 239 * - dec 240 * - fixed 241 * - hex 242 * - internal 243 * - left 244 * - oct 245 * - right 246 * - scientific 247 * - showbase 248 * - showpoint 249 * - showpos 250 * - skipws 251 * - unitbuf 252 * - uppercase 253 * - adjustfield 254 * - basefield 255 * - floatfield 256 */ 257 typedef _Ios_Fmtflags fmtflags; 258 259 /// Insert/extract @c bool in alphabetic rather than numeric format. 260 static const fmtflags boolalpha = _S_boolalpha; 261 262 /// Converts integer input or generates integer output in decimal base. 263 static const fmtflags dec = _S_dec; 264 265 /// Generate floating-point output in fixed-point notation. 266 static const fmtflags fixed = _S_fixed; 267 268 /// Converts integer input or generates integer output in hexadecimal base. 269 static const fmtflags hex = _S_hex; 270 271 /// Adds fill characters at a designated internal point in certain 272 /// generated output, or identical to @c right if no such point is 273 /// designated. 274 static const fmtflags internal = _S_internal; 275 276 /// Adds fill characters on the right (final positions) of certain 277 /// generated output. (I.e., the thing you print is flush left.) 278 static const fmtflags left = _S_left; 279 280 /// Converts integer input or generates integer output in octal base. 281 static const fmtflags oct = _S_oct; 282 283 /// Adds fill characters on the left (initial positions) of certain 284 /// generated output. (I.e., the thing you print is flush right.) 285 static const fmtflags right = _S_right; 286 287 /// Generates floating-point output in scientific notation. 288 static const fmtflags scientific = _S_scientific; 289 290 /// Generates a prefix indicating the numeric base of generated integer 291 /// output. 292 static const fmtflags showbase = _S_showbase; 293 294 /// Generates a decimal-point character unconditionally in generated 295 /// floating-point output. 296 static const fmtflags showpoint = _S_showpoint; 297 298 /// Generates a + sign in non-negative generated numeric output. 299 static const fmtflags showpos = _S_showpos; 300 301 /// Skips leading white space before certain input operations. 302 static const fmtflags skipws = _S_skipws; 303 304 /// Flushes output after each output operation. 305 static const fmtflags unitbuf = _S_unitbuf; 306 307 /// Replaces certain lowercase letters with their uppercase equivalents 308 /// in generated output. 309 static const fmtflags uppercase = _S_uppercase; 310 311 /// A mask of left|right|internal. Useful for the 2-arg form of @c setf. 312 static const fmtflags adjustfield = _S_adjustfield; 313 314 /// A mask of dec|oct|hex. Useful for the 2-arg form of @c setf. 315 static const fmtflags basefield = _S_basefield; 316 317 /// A mask of scientific|fixed. Useful for the 2-arg form of @c setf. 318 static const fmtflags floatfield = _S_floatfield; 319 320 // 27.4.2.1.3 Type ios_base::iostate 321 /** 322 * @brief This is a bitmask type. 323 * 324 * @c @a _Ios_Iostate is implementation-defined, but it is valid to 325 * perform bitwise operations on these values and expect the Right 326 * Thing to happen. Defined objects of type iostate are: 327 * - badbit 328 * - eofbit 329 * - failbit 330 * - goodbit 331 */ 332 typedef _Ios_Iostate iostate; 333 334 /// Indicates a loss of integrity in an input or output sequence (such 335 /// as an irrecoverable read error from a file). 336 static const iostate badbit = _S_badbit; 337 338 /// Indicates that an input operation reached the end of an input sequence. 339 static const iostate eofbit = _S_eofbit; 340 341 /// Indicates that an input operation failed to read the expected 342 /// characters, or that an output operation failed to generate the 343 /// desired characters. 344 static const iostate failbit = _S_failbit; 345 346 /// Indicates all is well. 347 static const iostate goodbit = _S_goodbit; 348 349 // 27.4.2.1.4 Type ios_base::openmode 350 /** 351 * @brief This is a bitmask type. 352 * 353 * @c @a _Ios_Openmode is implementation-defined, but it is valid to 354 * perform bitwise operations on these values and expect the Right 355 * Thing to happen. Defined objects of type openmode are: 356 * - app 357 * - ate 358 * - binary 359 * - in 360 * - out 361 * - trunc 362 */ 363 typedef _Ios_Openmode openmode; 364 365 /// Seek to end before each write. 366 static const openmode app = _S_app; 367 368 /// Open and seek to end immediately after opening. 369 static const openmode ate = _S_ate; 370 371 /// Perform input and output in binary mode (as opposed to text mode). 372 /// This is probably not what you think it is; see 373 /// http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch27s02.html 374 static const openmode binary = _S_bin; 375 376 /// Open for input. Default for @c ifstream and fstream. 377 static const openmode in = _S_in; 378 379 /// Open for output. Default for @c ofstream and fstream. 380 static const openmode out = _S_out; 381 382 /// Open for input. Default for @c ofstream. 383 static const openmode trunc = _S_trunc; 384 385 // 27.4.2.1.5 Type ios_base::seekdir 386 /** 387 * @brief This is an enumerated type. 388 * 389 * @c @a _Ios_Seekdir is implementation-defined. Defined values 390 * of type seekdir are: 391 * - beg 392 * - cur, equivalent to @c SEEK_CUR in the C standard library. 393 * - end, equivalent to @c SEEK_END in the C standard library. 394 */ 395 typedef _Ios_Seekdir seekdir; 396 397 /// Request a seek relative to the beginning of the stream. 398 static const seekdir beg = _S_beg; 399 400 /// Request a seek relative to the current position within the sequence. 401 static const seekdir cur = _S_cur; 402 403 /// Request a seek relative to the current end of the sequence. 404 static const seekdir end = _S_end; 405 406 // Annex D.6 407 typedef int io_state; 408 typedef int open_mode; 409 typedef int seek_dir; 410 411 typedef std::streampos streampos; 412 typedef std::streamoff streamoff; 413 414 // Callbacks; 415 /** 416 * @brief The set of events that may be passed to an event callback. 417 * 418 * erase_event is used during ~ios() and copyfmt(). imbue_event is used 419 * during imbue(). copyfmt_event is used during copyfmt(). 420 */ 421 enum event 422 { 423 erase_event, 424 imbue_event, 425 copyfmt_event 426 }; 427 428 /** 429 * @brief The type of an event callback function. 430 * @param event One of the members of the event enum. 431 * @param ios_base Reference to the ios_base object. 432 * @param int The integer provided when the callback was registered. 433 * 434 * Event callbacks are user defined functions that get called during 435 * several ios_base and basic_ios functions, specifically imbue(), 436 * copyfmt(), and ~ios(). 437 */ 438 typedef void (*event_callback) (event, ios_base&, int); 439 440 /** 441 * @brief Add the callback __fn with parameter __index. 442 * @param __fn The function to add. 443 * @param __index The integer to pass to the function when invoked. 444 * 445 * Registers a function as an event callback with an integer parameter to 446 * be passed to the function when invoked. Multiple copies of the 447 * function are allowed. If there are multiple callbacks, they are 448 * invoked in the order they were registered. 449 */ 450 void 451 register_callback(event_callback __fn, int __index); 452 453 protected: 454 streamsize _M_precision; 455 streamsize _M_width; 456 fmtflags _M_flags; 457 iostate _M_exception; 458 iostate _M_streambuf_state; 459 460 // 27.4.2.6 Members for callbacks 461 // 27.4.2.6 ios_base callbacks 462 struct _Callback_list 463 { 464 // Data Members 465 _Callback_list* _M_next; 466 ios_base::event_callback _M_fn; 467 int _M_index; 468 _Atomic_word _M_refcount; // 0 means one reference. 469 470 _Callback_list(ios_base::event_callback __fn, int __index, 471 _Callback_list* __cb) 472 : _M_next(__cb), _M_fn(__fn), _M_index(__index), _M_refcount(0) { } 473 474 void 475 _M_add_reference() { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 476 477 // 0 => OK to delete. 478 int 479 _M_remove_reference() 480 { 481 // Be race-detector-friendly. For more info see bits/c++config. 482 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); 483 int __res = __gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1); 484 if (__res == 0) 485 { 486 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); 487 } 488 return __res; 489 } 490 }; 491 492 _Callback_list* _M_callbacks; 493 494 void 495 _M_call_callbacks(event __ev) throw(); 496 497 void 498 _M_dispose_callbacks(void) throw(); 499 500 // 27.4.2.5 Members for iword/pword storage 501 struct _Words 502 { 503 void* _M_pword; 504 long _M_iword; 505 _Words() : _M_pword(0), _M_iword(0) { } 506 }; 507 508 // Only for failed iword/pword calls. 509 _Words _M_word_zero; 510 511 // Guaranteed storage. 512 // The first 5 iword and pword slots are reserved for internal use. 513 enum { _S_local_word_size = 8 }; 514 _Words _M_local_word[_S_local_word_size]; 515 516 // Allocated storage. 517 int _M_word_size; 518 _Words* _M_word; 519 520 _Words& 521 _M_grow_words(int __index, bool __iword); 522 523 // Members for locale and locale caching. 524 locale _M_ios_locale; 525 526 void 527 _M_init() throw(); 528 529 public: 530 531 // 27.4.2.1.6 Class ios_base::Init 532 // Used to initialize standard streams. In theory, g++ could use 533 // -finit-priority to order this stuff correctly without going 534 // through these machinations. 535 class Init 536 { 537 friend class ios_base; 538 public: 539 Init(); 540 ~Init(); 541 542 private: 543 static _Atomic_word _S_refcount; 544 static bool _S_synced_with_stdio; 545 }; 546 547 // [27.4.2.2] fmtflags state functions 548 /** 549 * @brief Access to format flags. 550 * @return The format control flags for both input and output. 551 */ 552 fmtflags 553 flags() const 554 { return _M_flags; } 555 556 /** 557 * @brief Setting new format flags all at once. 558 * @param fmtfl The new flags to set. 559 * @return The previous format control flags. 560 * 561 * This function overwrites all the format flags with @a fmtfl. 562 */ 563 fmtflags 564 flags(fmtflags __fmtfl) 565 { 566 fmtflags __old = _M_flags; 567 _M_flags = __fmtfl; 568 return __old; 569 } 570 571 /** 572 * @brief Setting new format flags. 573 * @param fmtfl Additional flags to set. 574 * @return The previous format control flags. 575 * 576 * This function sets additional flags in format control. Flags that 577 * were previously set remain set. 578 */ 579 fmtflags 580 setf(fmtflags __fmtfl) 581 { 582 fmtflags __old = _M_flags; 583 _M_flags |= __fmtfl; 584 return __old; 585 } 586 587 /** 588 * @brief Setting new format flags. 589 * @param fmtfl Additional flags to set. 590 * @param mask The flags mask for @a fmtfl. 591 * @return The previous format control flags. 592 * 593 * This function clears @a mask in the format flags, then sets 594 * @a fmtfl @c & @a mask. An example mask is @c ios_base::adjustfield. 595 */ 596 fmtflags 597 setf(fmtflags __fmtfl, fmtflags __mask) 598 { 599 fmtflags __old = _M_flags; 600 _M_flags &= ~__mask; 601 _M_flags |= (__fmtfl & __mask); 602 return __old; 603 } 604 605 /** 606 * @brief Clearing format flags. 607 * @param mask The flags to unset. 608 * 609 * This function clears @a mask in the format flags. 610 */ 611 void 612 unsetf(fmtflags __mask) 613 { _M_flags &= ~__mask; } 614 615 /** 616 * @brief Flags access. 617 * @return The precision to generate on certain output operations. 618 * 619 * Be careful if you try to give a definition of @a precision here; see 620 * DR 189. 621 */ 622 streamsize 623 precision() const 624 { return _M_precision; } 625 626 /** 627 * @brief Changing flags. 628 * @param prec The new precision value. 629 * @return The previous value of precision(). 630 */ 631 streamsize 632 precision(streamsize __prec) 633 { 634 streamsize __old = _M_precision; 635 _M_precision = __prec; 636 return __old; 637 } 638 639 /** 640 * @brief Flags access. 641 * @return The minimum field width to generate on output operations. 642 * 643 * <em>Minimum field width</em> refers to the number of characters. 644 */ 645 streamsize 646 width() const 647 { return _M_width; } 648 649 /** 650 * @brief Changing flags. 651 * @param wide The new width value. 652 * @return The previous value of width(). 653 */ 654 streamsize 655 width(streamsize __wide) 656 { 657 streamsize __old = _M_width; 658 _M_width = __wide; 659 return __old; 660 } 661 662 // [27.4.2.4] ios_base static members 663 /** 664 * @brief Interaction with the standard C I/O objects. 665 * @param sync Whether to synchronize or not. 666 * @return True if the standard streams were previously synchronized. 667 * 668 * The synchronization referred to is @e only that between the standard 669 * C facilities (e.g., stdout) and the standard C++ objects (e.g., 670 * cout). User-declared streams are unaffected. See 671 * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch28s02.html 672 */ 673 static bool 674 sync_with_stdio(bool __sync = true); 675 676 // [27.4.2.3] ios_base locale functions 677 /** 678 * @brief Setting a new locale. 679 * @param loc The new locale. 680 * @return The previous locale. 681 * 682 * Sets the new locale for this stream, and then invokes each callback 683 * with imbue_event. 684 */ 685 locale 686 imbue(const locale& __loc) throw(); 687 688 /** 689 * @brief Locale access 690 * @return A copy of the current locale. 691 * 692 * If @c imbue(loc) has previously been called, then this function 693 * returns @c loc. Otherwise, it returns a copy of @c std::locale(), 694 * the global C++ locale. 695 */ 696 locale 697 getloc() const 698 { return _M_ios_locale; } 699 700 /** 701 * @brief Locale access 702 * @return A reference to the current locale. 703 * 704 * Like getloc above, but returns a reference instead of 705 * generating a copy. 706 */ 707 const locale& 708 _M_getloc() const 709 { return _M_ios_locale; } 710 711 // [27.4.2.5] ios_base storage functions 712 /** 713 * @brief Access to unique indices. 714 * @return An integer different from all previous calls. 715 * 716 * This function returns a unique integer every time it is called. It 717 * can be used for any purpose, but is primarily intended to be a unique 718 * index for the iword and pword functions. The expectation is that an 719 * application calls xalloc in order to obtain an index in the iword and 720 * pword arrays that can be used without fear of conflict. 721 * 722 * The implementation maintains a static variable that is incremented and 723 * returned on each invocation. xalloc is guaranteed to return an index 724 * that is safe to use in the iword and pword arrays. 725 */ 726 static int 727 xalloc() throw(); 728 729 /** 730 * @brief Access to integer array. 731 * @param __ix Index into the array. 732 * @return A reference to an integer associated with the index. 733 * 734 * The iword function provides access to an array of integers that can be 735 * used for any purpose. The array grows as required to hold the 736 * supplied index. All integers in the array are initialized to 0. 737 * 738 * The implementation reserves several indices. You should use xalloc to 739 * obtain an index that is safe to use. Also note that since the array 740 * can grow dynamically, it is not safe to hold onto the reference. 741 */ 742 long& 743 iword(int __ix) 744 { 745 _Words& __word = (__ix < _M_word_size) 746 ? _M_word[__ix] : _M_grow_words(__ix, true); 747 return __word._M_iword; 748 } 749 750 /** 751 * @brief Access to void pointer array. 752 * @param __ix Index into the array. 753 * @return A reference to a void* associated with the index. 754 * 755 * The pword function provides access to an array of pointers that can be 756 * used for any purpose. The array grows as required to hold the 757 * supplied index. All pointers in the array are initialized to 0. 758 * 759 * The implementation reserves several indices. You should use xalloc to 760 * obtain an index that is safe to use. Also note that since the array 761 * can grow dynamically, it is not safe to hold onto the reference. 762 */ 763 void*& 764 pword(int __ix) 765 { 766 _Words& __word = (__ix < _M_word_size) 767 ? _M_word[__ix] : _M_grow_words(__ix, false); 768 return __word._M_pword; 769 } 770 771 // Destructor 772 /** 773 * Invokes each callback with erase_event. Destroys local storage. 774 * 775 * Note that the ios_base object for the standard streams never gets 776 * destroyed. As a result, any callbacks registered with the standard 777 * streams will not get invoked with erase_event (unless copyfmt is 778 * used). 779 */ 780 virtual ~ios_base(); 781 782 protected: 783 ios_base() throw (); 784 785 // _GLIBCXX_RESOLVE_LIB_DEFECTS 786 // 50. Copy constructor and assignment operator of ios_base 787 private: 788 ios_base(const ios_base&); 789 790 ios_base& 791 operator=(const ios_base&); 792 }; 793 794 // [27.4.5.1] fmtflags manipulators 795 /// Calls base.setf(ios_base::boolalpha). 796 inline ios_base& 797 boolalpha(ios_base& __base) 798 { 799 __base.setf(ios_base::boolalpha); 800 return __base; 801 } 802 803 /// Calls base.unsetf(ios_base::boolalpha). 804 inline ios_base& 805 noboolalpha(ios_base& __base) 806 { 807 __base.unsetf(ios_base::boolalpha); 808 return __base; 809 } 810 811 /// Calls base.setf(ios_base::showbase). 812 inline ios_base& 813 showbase(ios_base& __base) 814 { 815 __base.setf(ios_base::showbase); 816 return __base; 817 } 818 819 /// Calls base.unsetf(ios_base::showbase). 820 inline ios_base& 821 noshowbase(ios_base& __base) 822 { 823 __base.unsetf(ios_base::showbase); 824 return __base; 825 } 826 827 /// Calls base.setf(ios_base::showpoint). 828 inline ios_base& 829 showpoint(ios_base& __base) 830 { 831 __base.setf(ios_base::showpoint); 832 return __base; 833 } 834 835 /// Calls base.unsetf(ios_base::showpoint). 836 inline ios_base& 837 noshowpoint(ios_base& __base) 838 { 839 __base.unsetf(ios_base::showpoint); 840 return __base; 841 } 842 843 /// Calls base.setf(ios_base::showpos). 844 inline ios_base& 845 showpos(ios_base& __base) 846 { 847 __base.setf(ios_base::showpos); 848 return __base; 849 } 850 851 /// Calls base.unsetf(ios_base::showpos). 852 inline ios_base& 853 noshowpos(ios_base& __base) 854 { 855 __base.unsetf(ios_base::showpos); 856 return __base; 857 } 858 859 /// Calls base.setf(ios_base::skipws). 860 inline ios_base& 861 skipws(ios_base& __base) 862 { 863 __base.setf(ios_base::skipws); 864 return __base; 865 } 866 867 /// Calls base.unsetf(ios_base::skipws). 868 inline ios_base& 869 noskipws(ios_base& __base) 870 { 871 __base.unsetf(ios_base::skipws); 872 return __base; 873 } 874 875 /// Calls base.setf(ios_base::uppercase). 876 inline ios_base& 877 uppercase(ios_base& __base) 878 { 879 __base.setf(ios_base::uppercase); 880 return __base; 881 } 882 883 /// Calls base.unsetf(ios_base::uppercase). 884 inline ios_base& 885 nouppercase(ios_base& __base) 886 { 887 __base.unsetf(ios_base::uppercase); 888 return __base; 889 } 890 891 /// Calls base.setf(ios_base::unitbuf). 892 inline ios_base& 893 unitbuf(ios_base& __base) 894 { 895 __base.setf(ios_base::unitbuf); 896 return __base; 897 } 898 899 /// Calls base.unsetf(ios_base::unitbuf). 900 inline ios_base& 901 nounitbuf(ios_base& __base) 902 { 903 __base.unsetf(ios_base::unitbuf); 904 return __base; 905 } 906 907 // [27.4.5.2] adjustfield manipulators 908 /// Calls base.setf(ios_base::internal, ios_base::adjustfield). 909 inline ios_base& 910 internal(ios_base& __base) 911 { 912 __base.setf(ios_base::internal, ios_base::adjustfield); 913 return __base; 914 } 915 916 /// Calls base.setf(ios_base::left, ios_base::adjustfield). 917 inline ios_base& 918 left(ios_base& __base) 919 { 920 __base.setf(ios_base::left, ios_base::adjustfield); 921 return __base; 922 } 923 924 /// Calls base.setf(ios_base::right, ios_base::adjustfield). 925 inline ios_base& 926 right(ios_base& __base) 927 { 928 __base.setf(ios_base::right, ios_base::adjustfield); 929 return __base; 930 } 931 932 // [27.4.5.3] basefield manipulators 933 /// Calls base.setf(ios_base::dec, ios_base::basefield). 934 inline ios_base& 935 dec(ios_base& __base) 936 { 937 __base.setf(ios_base::dec, ios_base::basefield); 938 return __base; 939 } 940 941 /// Calls base.setf(ios_base::hex, ios_base::basefield). 942 inline ios_base& 943 hex(ios_base& __base) 944 { 945 __base.setf(ios_base::hex, ios_base::basefield); 946 return __base; 947 } 948 949 /// Calls base.setf(ios_base::oct, ios_base::basefield). 950 inline ios_base& 951 oct(ios_base& __base) 952 { 953 __base.setf(ios_base::oct, ios_base::basefield); 954 return __base; 955 } 956 957 // [27.4.5.4] floatfield manipulators 958 /// Calls base.setf(ios_base::fixed, ios_base::floatfield). 959 inline ios_base& 960 fixed(ios_base& __base) 961 { 962 __base.setf(ios_base::fixed, ios_base::floatfield); 963 return __base; 964 } 965 966 /// Calls base.setf(ios_base::scientific, ios_base::floatfield). 967 inline ios_base& 968 scientific(ios_base& __base) 969 { 970 __base.setf(ios_base::scientific, ios_base::floatfield); 971 return __base; 972 } 973 974 _GLIBCXX_END_NAMESPACE_VERSION 975 } // namespace 976 977 #endif /* _IOS_BASE_H */ 978
