1 // Iostreams base classes -*- C++ -*- 2 3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 4 // 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 2, or (at your option) 10 // any later version. 11 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. 16 17 // You should have received a copy of the GNU General Public License along 18 // with this library; see the file COPYING. If not, write to the Free 19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 20 // USA. 21 22 // As a special exception, you may use this file as part of a free software 23 // library without restriction. Specifically, if other files instantiate 24 // templates or use macros or inline functions from this file, or you compile 25 // this file and link it with other files to produce an executable, this 26 // file does not by itself cause the resulting executable to be covered by 27 // the GNU General Public License. This exception does not however 28 // invalidate any other reasons why the executable file might be covered by 29 // the GNU General Public License. 30 31 // 32 // ISO C++ 14882: 27.4 Iostreams base classes 33 // 34 35 /** @file ios_base.h 36 * This is an internal header file, included by other library headers. 37 * You should not attempt to use it directly. 38 */ 39 40 #ifndef _IOS_BASE_H 41 #define _IOS_BASE_H 1 42 43 #pragma GCC system_header 44 45 #include <bits/atomicity.h> 46 #include <bits/localefwd.h> 47 #include <bits/locale_classes.h> 48 49 namespace std 50 { 51 // The following definitions of bitmask types are enums, not ints, 52 // as permitted (but not required) in the standard, in order to provide 53 // better type safety in iostream calls. A side effect is that 54 // expressions involving them are no longer compile-time constants. 55 enum _Ios_Fmtflags { _S_ios_fmtflags_end = 1L << 16 }; 56 57 inline _Ios_Fmtflags 58 operator&(_Ios_Fmtflags __a, _Ios_Fmtflags __b) 59 { return _Ios_Fmtflags(static_cast<int>(__a) & static_cast<int>(__b)); } 60 61 inline _Ios_Fmtflags 62 operator|(_Ios_Fmtflags __a, _Ios_Fmtflags __b) 63 { return _Ios_Fmtflags(static_cast<int>(__a) | static_cast<int>(__b)); } 64 65 inline _Ios_Fmtflags 66 operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b) 67 { return _Ios_Fmtflags(static_cast<int>(__a) ^ static_cast<int>(__b)); } 68 69 inline _Ios_Fmtflags 70 operator|=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 71 { return __a = __a | __b; } 72 73 inline _Ios_Fmtflags 74 operator&=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 75 { return __a = __a & __b; } 76 77 inline _Ios_Fmtflags 78 operator^=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 79 { return __a = __a ^ __b; } 80 81 inline _Ios_Fmtflags 82 operator~(_Ios_Fmtflags __a) 83 { return _Ios_Fmtflags(~static_cast<int>(__a)); } 84 85 86 enum _Ios_Openmode { _S_ios_openmode_end = 1L << 16 }; 87 88 inline _Ios_Openmode 89 operator&(_Ios_Openmode __a, _Ios_Openmode __b) 90 { return _Ios_Openmode(static_cast<int>(__a) & static_cast<int>(__b)); } 91 92 inline _Ios_Openmode 93 operator|(_Ios_Openmode __a, _Ios_Openmode __b) 94 { return _Ios_Openmode(static_cast<int>(__a) | static_cast<int>(__b)); } 95 96 inline _Ios_Openmode 97 operator^(_Ios_Openmode __a, _Ios_Openmode __b) 98 { return _Ios_Openmode(static_cast<int>(__a) ^ static_cast<int>(__b)); } 99 100 inline _Ios_Openmode 101 operator|=(_Ios_Openmode& __a, _Ios_Openmode __b) 102 { return __a = __a | __b; } 103 104 inline _Ios_Openmode 105 operator&=(_Ios_Openmode& __a, _Ios_Openmode __b) 106 { return __a = __a & __b; } 107 108 inline _Ios_Openmode 109 operator^=(_Ios_Openmode& __a, _Ios_Openmode __b) 110 { return __a = __a ^ __b; } 111 112 inline _Ios_Openmode 113 operator~(_Ios_Openmode __a) 114 { return _Ios_Openmode(~static_cast<int>(__a)); } 115 116 117 enum _Ios_Iostate { _S_ios_iostate_end = 1L << 16 }; 118 119 inline _Ios_Iostate 120 operator&(_Ios_Iostate __a, _Ios_Iostate __b) 121 { return _Ios_Iostate(static_cast<int>(__a) & static_cast<int>(__b)); } 122 123 inline _Ios_Iostate 124 operator|(_Ios_Iostate __a, _Ios_Iostate __b) 125 { return _Ios_Iostate(static_cast<int>(__a) | static_cast<int>(__b)); } 126 127 inline _Ios_Iostate 128 operator^(_Ios_Iostate __a, _Ios_Iostate __b) 129 { return _Ios_Iostate(static_cast<int>(__a) ^ static_cast<int>(__b)); } 130 131 inline _Ios_Iostate 132 operator|=(_Ios_Iostate& __a, _Ios_Iostate __b) 133 { return __a = __a | __b; } 134 135 inline _Ios_Iostate 136 operator&=(_Ios_Iostate& __a, _Ios_Iostate __b) 137 { return __a = __a & __b; } 138 139 inline _Ios_Iostate 140 operator^=(_Ios_Iostate& __a, _Ios_Iostate __b) 141 { return __a = __a ^ __b; } 142 143 inline _Ios_Iostate 144 operator~(_Ios_Iostate __a) 145 { return _Ios_Iostate(~static_cast<int>(__a)); } 146 147 enum _Ios_Seekdir { _S_ios_seekdir_end = 1L << 16 }; 148 149 // 27.4.2 Class ios_base 150 /** 151 * @brief The very top of the I/O class hierarchy. 152 * 153 * This class defines everything that can be defined about I/O that does 154 * not depend on the type of characters being input or output. Most 155 * people will only see @c ios_base when they need to specify the full 156 * name of the various I/O flags (e.g., the openmodes). 157 */ 158 class ios_base 159 { 160 public: 161 162 // 27.4.2.1.1 Class ios_base::failure 163 /// These are thrown to indicate problems. Doc me. 164 class failure : public exception 165 { 166 public: 167 // _GLIBCXX_RESOLVE_LIB_DEFECTS 168 // 48. Use of non-existent exception constructor 169 explicit 170 failure(const string& __str) throw(); 171 172 // This declaration is not useless: 173 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 174 virtual 175 ~failure() throw(); 176 177 virtual const char* 178 what() const throw(); 179 180 private: 181 string _M_msg; 182 }; 183 184 // 27.4.2.1.2 Type ios_base::fmtflags 185 /** 186 * @brief This is a bitmask type. 187 * 188 * @c "_Ios_Fmtflags" is implementation-defined, but it is valid to 189 * perform bitwise operations on these values and expect the Right 190 * Thing to happen. Defined objects of type fmtflags are: 191 * - boolalpha 192 * - dec 193 * - fixed 194 * - hex 195 * - internal 196 * - left 197 * - oct 198 * - right 199 * - scientific 200 * - showbase 201 * - showpoint 202 * - showpos 203 * - skipws 204 * - unitbuf 205 * - uppercase 206 * - adjustfield 207 * - basefield 208 * - floatfield 209 */ 210 typedef _Ios_Fmtflags fmtflags; 211 212 /// Insert/extract @c bool in alphabetic rather than numeric format. 213 static const fmtflags boolalpha = fmtflags(__ios_flags::_S_boolalpha); 214 215 /// Converts integer input or generates integer output in decimal base. 216 static const fmtflags dec = fmtflags(__ios_flags::_S_dec); 217 218 /// Generate floating-point output in fixed-point notation. 219 static const fmtflags fixed = fmtflags(__ios_flags::_S_fixed); 220 221 /// Converts integer input or generates integer output in hexadecimal base. 222 static const fmtflags hex = fmtflags(__ios_flags::_S_hex); 223 224 /// Adds fill characters at a designated internal point in certain 225 /// generated output, or identical to @c right if no such point is 226 /// designated. 227 static const fmtflags internal = fmtflags(__ios_flags::_S_internal); 228 229 /// Adds fill characters on the right (final positions) of certain 230 /// generated output. (I.e., the thing you print is flush left.) 231 static const fmtflags left = fmtflags(__ios_flags::_S_left); 232 233 /// Converts integer input or generates integer output in octal base. 234 static const fmtflags oct = fmtflags(__ios_flags::_S_oct); 235 236 /// Adds fill characters on the left (initial positions) of certain 237 /// generated output. (I.e., the thing you print is flush right.) 238 static const fmtflags right = fmtflags(__ios_flags::_S_right); 239 240 /// Generates floating-point output in scientific notation. 241 static const fmtflags scientific = fmtflags(__ios_flags::_S_scientific); 242 243 /// Generates a prefix indicating the numeric base of generated integer 244 /// output. 245 static const fmtflags showbase = fmtflags(__ios_flags::_S_showbase); 246 247 /// Generates a decimal-point character unconditionally in generated 248 /// floating-point output. 249 static const fmtflags showpoint = fmtflags(__ios_flags::_S_showpoint); 250 251 /// Generates a + sign in non-negative generated numeric output. 252 static const fmtflags showpos = fmtflags(__ios_flags::_S_showpos); 253 254 /// Skips leading white space before certain input operations. 255 static const fmtflags skipws = fmtflags(__ios_flags::_S_skipws); 256 257 /// Flushes output after each output operation. 258 static const fmtflags unitbuf = fmtflags(__ios_flags::_S_unitbuf); 259 260 /// Replaces certain lowercase letters with their uppercase equivalents 261 /// in generated output. 262 static const fmtflags uppercase = fmtflags(__ios_flags::_S_uppercase); 263 264 /// A mask of left|right|internal. Useful for the 2-arg form of @c setf. 265 static const fmtflags adjustfield = fmtflags(__ios_flags::_S_adjustfield); 266 267 /// A mask of dec|oct|hex. Useful for the 2-arg form of @c setf. 268 static const fmtflags basefield = fmtflags(__ios_flags::_S_basefield); 269 270 /// A mask of scientific|fixed. Useful for the 2-arg form of @c setf. 271 static const fmtflags floatfield = fmtflags(__ios_flags::_S_floatfield); 272 273 // 27.4.2.1.3 Type ios_base::iostate 274 /** 275 * @brief This is a bitmask type. 276 * 277 * @c "_Ios_Iostate" is implementation-defined, but it is valid to 278 * perform bitwise operations on these values and expect the Right 279 * Thing to happen. Defined objects of type iostate are: 280 * - badbit 281 * - eofbit 282 * - failbit 283 * - goodbit 284 */ 285 typedef _Ios_Iostate iostate; 286 287 /// Indicates a loss of integrity in an input or output sequence (such 288 /// as an irrecoverable read error from a file). 289 static const iostate badbit = iostate(__ios_flags::_S_badbit); 290 291 /// Indicates that an input operation reached the end of an input sequence. 292 static const iostate eofbit = iostate(__ios_flags::_S_eofbit); 293 294 /// Indicates that an input operation failed to read the expected 295 /// characters, or that an output operation failed to generate the 296 /// desired characters. 297 static const iostate failbit = iostate(__ios_flags::_S_failbit); 298 299 /// Indicates all is well. 300 static const iostate goodbit = iostate(0); 301 302 // 27.4.2.1.4 Type ios_base::openmode 303 /** 304 * @brief This is a bitmask type. 305 * 306 * @c "_Ios_Openmode" is implementation-defined, but it is valid to 307 * perform bitwise operations on these values and expect the Right 308 * Thing to happen. Defined objects of type openmode are: 309 * - app 310 * - ate 311 * - binary 312 * - in 313 * - out 314 * - trunc 315 */ 316 typedef _Ios_Openmode openmode; 317 318 /// Seek to end before each write. 319 static const openmode app = openmode(__ios_flags::_S_app); 320 321 /// Open and seek to end immediately after opening. 322 static const openmode ate = openmode(__ios_flags::_S_ate); 323 324 /// Perform input and output in binary mode (as opposed to text mode). 325 /// This is probably not what you think it is; see 326 /// http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#3 and 327 /// http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#7 for more. 328 static const openmode binary = openmode(__ios_flags::_S_bin); 329 330 /// Open for input. Default for @c ifstream and fstream. 331 static const openmode in = openmode(__ios_flags::_S_in); 332 333 /// Open for output. Default for @c ofstream and fstream. 334 static const openmode out = openmode(__ios_flags::_S_out); 335 336 /// Open for input. Default for @c ofstream. 337 static const openmode trunc = openmode(__ios_flags::_S_trunc); 338 339 // 27.4.2.1.5 Type ios_base::seekdir 340 /** 341 * @brief This is an enumerated type. 342 * 343 * @c "_Ios_Seekdir" is implementation-defined. Defined values 344 * of type seekdir are: 345 * - beg 346 * - cur, equivalent to @c SEEK_CUR in the C standard library. 347 * - end, equivalent to @c SEEK_END in the C standard library. 348 */ 349 typedef _Ios_Seekdir seekdir; 350 351 /// Request a seek relative to the beginning of the stream. 352 static const seekdir beg = seekdir(0); 353 354 /// Request a seek relative to the current position within the sequence. 355 static const seekdir cur = seekdir(SEEK_CUR); 356 357 /// Request a seek relative to the current end of the sequence. 358 static const seekdir end = seekdir(SEEK_END); 359 360 #ifdef _GLIBCXX_DEPRECATED 361 // Annex D.6 362 typedef int io_state; 363 typedef int open_mode; 364 typedef int seek_dir; 365 366 typedef std::streampos streampos; 367 typedef std::streamoff streamoff; 368 #endif 369 370 // Callbacks; 371 /** 372 * @brief The set of events that may be passed to an event callback. 373 * 374 * erase_event is used during ~ios() and copyfmt(). imbue_event is used 375 * during imbue(). copyfmt_event is used during copyfmt(). 376 */ 377 enum event 378 { 379 erase_event, 380 imbue_event, 381 copyfmt_event 382 }; 383 384 /** 385 * @brief The type of an event callback function. 386 * @param event One of the members of the event enum. 387 * @param ios_base Reference to the ios_base object. 388 * @param int The integer provided when the callback was registered. 389 * 390 * Event callbacks are user defined functions that get called during 391 * several ios_base and basic_ios functions, specifically imbue(), 392 * copyfmt(), and ~ios(). 393 */ 394 typedef void (*event_callback) (event, ios_base&, int); 395 396 /** 397 * @brief Add the callback __fn with parameter __index. 398 * @param __fn The function to add. 399 * @param __index The integer to pass to the function when invoked. 400 * 401 * Registers a function as an event callback with an integer parameter to 402 * be passed to the function when invoked. Multiple copies of the 403 * function are allowed. If there are multiple callbacks, they are 404 * invoked in the order they were registered. 405 */ 406 void 407 register_callback(event_callback __fn, int __index); 408 409 protected: 410 //@{ 411 /** 412 * @if maint 413 * ios_base data members (doc me) 414 * @endif 415 */ 416 streamsize _M_precision; 417 streamsize _M_width; 418 fmtflags _M_flags; 419 iostate _M_exception; 420 iostate _M_streambuf_state; 421 //@} 422 423 // 27.4.2.6 Members for callbacks 424 // 27.4.2.6 ios_base callbacks 425 struct _Callback_list 426 { 427 // Data Members 428 _Callback_list* _M_next; 429 ios_base::event_callback _M_fn; 430 int _M_index; 431 _Atomic_word _M_refcount; // 0 means one reference. 432 _Callback_list_Callback_list433 _Callback_list(ios_base::event_callback __fn, int __index, 434 _Callback_list* __cb) 435 : _M_next(__cb), _M_fn(__fn), _M_index(__index), _M_refcount(0) { } 436 437 void _M_add_reference_Callback_list438 _M_add_reference() { __gnu_cxx::__atomic_add(&_M_refcount, 1); } 439 440 // 0 => OK to delete. 441 int _M_remove_reference_Callback_list442 _M_remove_reference() 443 { return __gnu_cxx::__exchange_and_add(&_M_refcount, -1); } 444 }; 445 446 _Callback_list* _M_callbacks; 447 448 void 449 _M_call_callbacks(event __ev) throw(); 450 451 void 452 _M_dispose_callbacks(void); 453 454 // 27.4.2.5 Members for iword/pword storage 455 struct _Words 456 { 457 void* _M_pword; 458 long _M_iword; _Words_Words459 _Words() : _M_pword(0), _M_iword(0) { } 460 }; 461 462 // Only for failed iword/pword calls. 463 _Words _M_word_zero; 464 465 // Guaranteed storage. 466 // The first 5 iword and pword slots are reserved for internal use. 467 static const int _S_local_word_size = 8; 468 _Words _M_local_word[_S_local_word_size]; 469 470 // Allocated storage. 471 int _M_word_size; 472 _Words* _M_word; 473 474 _Words& 475 _M_grow_words(int __index, bool __iword); 476 477 // Members for locale and locale caching. 478 locale _M_ios_locale; 479 480 void 481 _M_init(); 482 483 public: 484 485 // 27.4.2.1.6 Class ios_base::Init 486 // Used to initialize standard streams. In theory, g++ could use 487 // -finit-priority to order this stuff correctly without going 488 // through these machinations. 489 class Init 490 { 491 friend class ios_base; 492 public: 493 Init(); 494 ~Init(); 495 496 private: 497 static _Atomic_word _S_refcount; 498 static bool _S_synced_with_stdio; 499 }; 500 501 // [27.4.2.2] fmtflags state functions 502 /** 503 * @brief Access to format flags. 504 * @return The format control flags for both input and output. 505 */ 506 inline fmtflags flags()507 flags() const { return _M_flags; } 508 509 /** 510 * @brief Setting new format flags all at once. 511 * @param fmtfl The new flags to set. 512 * @return The previous format control flags. 513 * 514 * This function overwrites all the format flags with @a fmtfl. 515 */ 516 inline fmtflags flags(fmtflags __fmtfl)517 flags(fmtflags __fmtfl) 518 { 519 fmtflags __old = _M_flags; 520 _M_flags = __fmtfl; 521 return __old; 522 } 523 524 /** 525 * @brief Setting new format flags. 526 * @param fmtfl Additional flags to set. 527 * @return The previous format control flags. 528 * 529 * This function sets additional flags in format control. Flags that 530 * were previously set remain set. 531 */ 532 inline fmtflags setf(fmtflags __fmtfl)533 setf(fmtflags __fmtfl) 534 { 535 fmtflags __old = _M_flags; 536 _M_flags |= __fmtfl; 537 return __old; 538 } 539 540 /** 541 * @brief Setting new format flags. 542 * @param fmtfl Additional flags to set. 543 * @param mask The flags mask for @a fmtfl. 544 * @return The previous format control flags. 545 * 546 * This function clears @a mask in the format flags, then sets 547 * @a fmtfl @c & @a mask. An example mask is @c ios_base::adjustfield. 548 */ 549 inline fmtflags setf(fmtflags __fmtfl,fmtflags __mask)550 setf(fmtflags __fmtfl, fmtflags __mask) 551 { 552 fmtflags __old = _M_flags; 553 _M_flags &= ~__mask; 554 _M_flags |= (__fmtfl & __mask); 555 return __old; 556 } 557 558 /** 559 * @brief Clearing format flags. 560 * @param mask The flags to unset. 561 * 562 * This function clears @a mask in the format flags. 563 */ 564 inline void unsetf(fmtflags __mask)565 unsetf(fmtflags __mask) { _M_flags &= ~__mask; } 566 567 /** 568 * @brief Flags access. 569 * @return The precision to generate on certain output operations. 570 * 571 * @if maint 572 * Be careful if you try to give a definition of "precision" here; see 573 * DR 189. 574 * @endif 575 */ 576 inline streamsize precision()577 precision() const { return _M_precision; } 578 579 /** 580 * @brief Changing flags. 581 * @param prec The new precision value. 582 * @return The previous value of precision(). 583 */ 584 inline streamsize precision(streamsize __prec)585 precision(streamsize __prec) 586 { 587 streamsize __old = _M_precision; 588 _M_precision = __prec; 589 return __old; 590 } 591 592 /** 593 * @brief Flags access. 594 * @return The minimum field width to generate on output operations. 595 * 596 * "Minimum field width" refers to the number of characters. 597 */ 598 inline streamsize width()599 width() const { return _M_width; } 600 601 /** 602 * @brief Changing flags. 603 * @param wide The new width value. 604 * @return The previous value of width(). 605 */ 606 inline streamsize width(streamsize __wide)607 width(streamsize __wide) 608 { 609 streamsize __old = _M_width; 610 _M_width = __wide; 611 return __old; 612 } 613 614 // [27.4.2.4] ios_base static members 615 /** 616 * @brief Interaction with the standard C I/O objects. 617 * @param sync Whether to synchronize or not. 618 * @return True if the standard streams were previously synchronized. 619 * 620 * The synchronization referred to is @e only that between the standard 621 * C facilities (e.g., stdout) and the standard C++ objects (e.g., 622 * cout). User-declared streams are unaffected. See 623 * http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#8 for more. 624 */ 625 static bool 626 sync_with_stdio(bool __sync = true); 627 628 // [27.4.2.3] ios_base locale functions 629 /** 630 * @brief Setting a new locale. 631 * @param loc The new locale. 632 * @return The previous locale. 633 * 634 * Sets the new locale for this stream, and then invokes each callback 635 * with imbue_event. 636 */ 637 locale 638 imbue(const locale& __loc); 639 640 /** 641 * @brief Locale access 642 * @return A copy of the current locale. 643 * 644 * If @c imbue(loc) has previously been called, then this function 645 * returns @c loc. Otherwise, it returns a copy of @c std::locale(), 646 * the global C++ locale. 647 */ 648 inline locale getloc()649 getloc() const { return _M_ios_locale; } 650 651 /** 652 * @brief Locale access 653 * @return A reference to the current locale. 654 * 655 * Like getloc above, but returns a reference instead of 656 * generating a copy. 657 */ 658 inline const locale& _M_getloc()659 _M_getloc() const { return _M_ios_locale; } 660 661 // [27.4.2.5] ios_base storage functions 662 /** 663 * @brief Access to unique indices. 664 * @return An integer different from all previous calls. 665 * 666 * This function returns a unique integer every time it is called. It 667 * can be used for any purpose, but is primarily intended to be a unique 668 * index for the iword and pword functions. The expectation is that an 669 * application calls xalloc in order to obtain an index in the iword and 670 * pword arrays that can be used without fear of conflict. 671 * 672 * The implementation maintains a static variable that is incremented and 673 * returned on each invocation. xalloc is guaranteed to return an index 674 * that is safe to use in the iword and pword arrays. 675 */ 676 static int 677 xalloc() throw(); 678 679 /** 680 * @brief Access to integer array. 681 * @param __ix Index into the array. 682 * @return A reference to an integer associated with the index. 683 * 684 * The iword function provides access to an array of integers that can be 685 * used for any purpose. The array grows as required to hold the 686 * supplied index. All integers in the array are initialized to 0. 687 * 688 * The implementation reserves several indices. You should use xalloc to 689 * obtain an index that is safe to use. Also note that since the array 690 * can grow dynamically, it is not safe to hold onto the reference. 691 */ 692 inline long& iword(int __ix)693 iword(int __ix) 694 { 695 _Words& __word = (__ix < _M_word_size) 696 ? _M_word[__ix] : _M_grow_words(__ix, true); 697 return __word._M_iword; 698 } 699 700 /** 701 * @brief Access to void pointer array. 702 * @param __ix Index into the array. 703 * @return A reference to a void* associated with the index. 704 * 705 * The pword function provides access to an array of pointers that can be 706 * used for any purpose. The array grows as required to hold the 707 * supplied index. All pointers in the array are initialized to 0. 708 * 709 * The implementation reserves several indices. You should use xalloc to 710 * obtain an index that is safe to use. Also note that since the array 711 * can grow dynamically, it is not safe to hold onto the reference. 712 */ 713 inline void*& pword(int __ix)714 pword(int __ix) 715 { 716 _Words& __word = (__ix < _M_word_size) 717 ? _M_word[__ix] : _M_grow_words(__ix, false); 718 return __word._M_pword; 719 } 720 721 // Destructor 722 /** 723 * Invokes each callback with erase_event. Destroys local storage. 724 * 725 * Note that the ios_base object for the standard streams never gets 726 * destroyed. As a result, any callbacks registered with the standard 727 * streams will not get invoked with erase_event (unless copyfmt is 728 * used). 729 */ 730 virtual ~ios_base(); 731 732 protected: 733 ios_base(); 734 735 // _GLIBCXX_RESOLVE_LIB_DEFECTS 736 // 50. Copy constructor and assignment operator of ios_base 737 private: 738 ios_base(const ios_base&); 739 740 ios_base& 741 operator=(const ios_base&); 742 }; 743 744 // [27.4.5.1] fmtflags manipulators 745 /// Calls base.setf(ios_base::boolalpha). 746 inline ios_base& boolalpha(ios_base & __base)747 boolalpha(ios_base& __base) 748 { 749 __base.setf(ios_base::boolalpha); 750 return __base; 751 } 752 753 /// Calls base.unsetf(ios_base::boolalpha). 754 inline ios_base& noboolalpha(ios_base & __base)755 noboolalpha(ios_base& __base) 756 { 757 __base.unsetf(ios_base::boolalpha); 758 return __base; 759 } 760 761 /// Calls base.setf(ios_base::showbase). 762 inline ios_base& showbase(ios_base & __base)763 showbase(ios_base& __base) 764 { 765 __base.setf(ios_base::showbase); 766 return __base; 767 } 768 769 /// Calls base.unsetf(ios_base::showbase). 770 inline ios_base& noshowbase(ios_base & __base)771 noshowbase(ios_base& __base) 772 { 773 __base.unsetf(ios_base::showbase); 774 return __base; 775 } 776 777 /// Calls base.setf(ios_base::showpoint). 778 inline ios_base& showpoint(ios_base & __base)779 showpoint(ios_base& __base) 780 { 781 __base.setf(ios_base::showpoint); 782 return __base; 783 } 784 785 /// Calls base.unsetf(ios_base::showpoint). 786 inline ios_base& noshowpoint(ios_base & __base)787 noshowpoint(ios_base& __base) 788 { 789 __base.unsetf(ios_base::showpoint); 790 return __base; 791 } 792 793 /// Calls base.setf(ios_base::showpos). 794 inline ios_base& showpos(ios_base & __base)795 showpos(ios_base& __base) 796 { 797 __base.setf(ios_base::showpos); 798 return __base; 799 } 800 801 /// Calls base.unsetf(ios_base::showpos). 802 inline ios_base& noshowpos(ios_base & __base)803 noshowpos(ios_base& __base) 804 { 805 __base.unsetf(ios_base::showpos); 806 return __base; 807 } 808 809 /// Calls base.setf(ios_base::skipws). 810 inline ios_base& skipws(ios_base & __base)811 skipws(ios_base& __base) 812 { 813 __base.setf(ios_base::skipws); 814 return __base; 815 } 816 817 /// Calls base.unsetf(ios_base::skipws). 818 inline ios_base& noskipws(ios_base & __base)819 noskipws(ios_base& __base) 820 { 821 __base.unsetf(ios_base::skipws); 822 return __base; 823 } 824 825 /// Calls base.setf(ios_base::uppercase). 826 inline ios_base& uppercase(ios_base & __base)827 uppercase(ios_base& __base) 828 { 829 __base.setf(ios_base::uppercase); 830 return __base; 831 } 832 833 /// Calls base.unsetf(ios_base::uppercase). 834 inline ios_base& nouppercase(ios_base & __base)835 nouppercase(ios_base& __base) 836 { 837 __base.unsetf(ios_base::uppercase); 838 return __base; 839 } 840 841 /// Calls base.setf(ios_base::unitbuf). 842 inline ios_base& unitbuf(ios_base & __base)843 unitbuf(ios_base& __base) 844 { 845 __base.setf(ios_base::unitbuf); 846 return __base; 847 } 848 849 /// Calls base.unsetf(ios_base::unitbuf). 850 inline ios_base& nounitbuf(ios_base & __base)851 nounitbuf(ios_base& __base) 852 { 853 __base.unsetf(ios_base::unitbuf); 854 return __base; 855 } 856 857 // [27.4.5.2] adjustfield anipulators 858 /// Calls base.setf(ios_base::internal, ios_base::adjustfield). 859 inline ios_base& internal(ios_base & __base)860 internal(ios_base& __base) 861 { 862 __base.setf(ios_base::internal, ios_base::adjustfield); 863 return __base; 864 } 865 866 /// Calls base.setf(ios_base::left, ios_base::adjustfield). 867 inline ios_base& left(ios_base & __base)868 left(ios_base& __base) 869 { 870 __base.setf(ios_base::left, ios_base::adjustfield); 871 return __base; 872 } 873 874 /// Calls base.setf(ios_base::right, ios_base::adjustfield). 875 inline ios_base& right(ios_base & __base)876 right(ios_base& __base) 877 { 878 __base.setf(ios_base::right, ios_base::adjustfield); 879 return __base; 880 } 881 882 // [27.4.5.3] basefield anipulators 883 /// Calls base.setf(ios_base::dec, ios_base::basefield). 884 inline ios_base& dec(ios_base & __base)885 dec(ios_base& __base) 886 { 887 __base.setf(ios_base::dec, ios_base::basefield); 888 return __base; 889 } 890 891 /// Calls base.setf(ios_base::hex, ios_base::basefield). 892 inline ios_base& hex(ios_base & __base)893 hex(ios_base& __base) 894 { 895 __base.setf(ios_base::hex, ios_base::basefield); 896 return __base; 897 } 898 899 /// Calls base.setf(ios_base::oct, ios_base::basefield). 900 inline ios_base& oct(ios_base & __base)901 oct(ios_base& __base) 902 { 903 __base.setf(ios_base::oct, ios_base::basefield); 904 return __base; 905 } 906 907 // [27.4.5.4] floatfield anipulators 908 /// Calls base.setf(ios_base::fixed, ios_base::floatfield). 909 inline ios_base& fixed(ios_base & __base)910 fixed(ios_base& __base) 911 { 912 __base.setf(ios_base::fixed, ios_base::floatfield); 913 return __base; 914 } 915 916 /// Calls base.setf(ios_base::scientific, ios_base::floatfield). 917 inline ios_base& scientific(ios_base & __base)918 scientific(ios_base& __base) 919 { 920 __base.setf(ios_base::scientific, ios_base::floatfield); 921 return __base; 922 } 923 } // namespace std 924 925 #endif /* _IOS_BASE_H */ 926 927