1// Iostreams base classes -*- C++ -*- 2 3// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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/** @file ios_base.h 32 * This is an internal header file, included by other library headers. 33 * You should not attempt to use it directly. 34 */ 35 36// 37// ISO C++ 14882: 27.4 Iostreams base classes 38// 39 40#ifndef _IOS_BASE_H 41#define _IOS_BASE_H 1 42 43#pragma GCC system_header 44 45#include <ext/atomicity.h> 46#include <bits/localefwd.h> 47#include <bits/locale_classes.h> 48 49_GLIBCXX_BEGIN_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 56 { 57 _S_boolalpha = 1L << 0, 58 _S_dec = 1L << 1, 59 _S_fixed = 1L << 2, 60 _S_hex = 1L << 3, 61 _S_internal = 1L << 4, 62 _S_left = 1L << 5, 63 _S_oct = 1L << 6, 64 _S_right = 1L << 7, 65 _S_scientific = 1L << 8, 66 _S_showbase = 1L << 9, 67 _S_showpoint = 1L << 10, 68 _S_showpos = 1L << 11, 69 _S_skipws = 1L << 12, 70 _S_unitbuf = 1L << 13, 71 _S_uppercase = 1L << 14, 72 _S_adjustfield = _S_left | _S_right | _S_internal, 73 _S_basefield = _S_dec | _S_oct | _S_hex, 74 _S_floatfield = _S_scientific | _S_fixed, 75 _S_ios_fmtflags_end = 1L << 16 76 }; 77 78 inline _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 _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 _Ios_Fmtflags 87 operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b) 88 { return _Ios_Fmtflags(static_cast<int>(__a) ^ static_cast<int>(__b)); } 89 90 inline _Ios_Fmtflags& 91 operator|=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 92 { return __a = __a | __b; } 93 94 inline _Ios_Fmtflags& 95 operator&=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 96 { return __a = __a & __b; } 97 98 inline _Ios_Fmtflags& 99 operator^=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 100 { return __a = __a ^ __b; } 101 102 inline _Ios_Fmtflags 103 operator~(_Ios_Fmtflags __a) 104 { return _Ios_Fmtflags(~static_cast<int>(__a)); } 105 106 107 enum _Ios_Openmode 108 { 109 _S_app = 1L << 0, 110 _S_ate = 1L << 1, 111 _S_bin = 1L << 2, 112 _S_in = 1L << 3, 113 _S_out = 1L << 4, 114 _S_trunc = 1L << 5, 115 _S_ios_openmode_end = 1L << 16 116 }; 117 118 inline _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 _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 _Ios_Openmode 127 operator^(_Ios_Openmode __a, _Ios_Openmode __b) 128 { return _Ios_Openmode(static_cast<int>(__a) ^ static_cast<int>(__b)); } 129 130 inline _Ios_Openmode& 131 operator|=(_Ios_Openmode& __a, _Ios_Openmode __b) 132 { return __a = __a | __b; } 133 134 inline _Ios_Openmode& 135 operator&=(_Ios_Openmode& __a, _Ios_Openmode __b) 136 { return __a = __a & __b; } 137 138 inline _Ios_Openmode& 139 operator^=(_Ios_Openmode& __a, _Ios_Openmode __b) 140 { return __a = __a ^ __b; } 141 142 inline _Ios_Openmode 143 operator~(_Ios_Openmode __a) 144 { return _Ios_Openmode(~static_cast<int>(__a)); } 145 146 147 enum _Ios_Iostate 148 { 149 _S_goodbit = 0, 150 _S_badbit = 1L << 0, 151 _S_eofbit = 1L << 1, 152 _S_failbit = 1L << 2, 153 _S_ios_iostate_end = 1L << 16 154 }; 155 156 inline _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 _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 _Ios_Iostate 165 operator^(_Ios_Iostate __a, _Ios_Iostate __b) 166 { return _Ios_Iostate(static_cast<int>(__a) ^ static_cast<int>(__b)); } 167 168 inline _Ios_Iostate& 169 operator|=(_Ios_Iostate& __a, _Ios_Iostate __b) 170 { return __a = __a | __b; } 171 172 inline _Ios_Iostate& 173 operator&=(_Ios_Iostate& __a, _Ios_Iostate __b) 174 { return __a = __a & __b; } 175 176 inline _Ios_Iostate& 177 operator^=(_Ios_Iostate& __a, _Ios_Iostate __b) 178 { return __a = __a ^ __b; } 179 180 inline _Ios_Iostate 181 operator~(_Ios_Iostate __a) 182 { return _Ios_Iostate(~static_cast<int>(__a)); } 183 184 enum _Ios_Seekdir 185 { 186 _S_beg = 0, 187 _S_cur = SEEK_CUR, 188 _S_end = SEEK_END, 189 _S_ios_seekdir_end = 1L << 16 190 }; 191 192 // 27.4.2 Class ios_base 193 /** 194 * @brief The base of the I/O class hierarchy. 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 // 27.4.2.1.1 Class ios_base::failure 206 /// These are thrown to indicate problems. Doc me. 207 class failure : public exception 208 { 209 public: 210 // _GLIBCXX_RESOLVE_LIB_DEFECTS 211 // 48. Use of non-existent exception constructor 212 explicit 213 failure(const string& __str) throw(); 214 215 // This declaration is not useless: 216 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 217 virtual 218 ~failure() throw(); 219 220 virtual const char* 221 what() const throw(); 222 223 private: 224 string _M_msg; 225 }; 226 227 // 27.4.2.1.2 Type ios_base::fmtflags 228 /** 229 * @brief This is a bitmask type. 230 * 231 * @c "_Ios_Fmtflags" is implementation-defined, but it is valid to 232 * perform bitwise operations on these values and expect the Right 233 * Thing to happen. Defined objects of type fmtflags are: 234 * - boolalpha 235 * - dec 236 * - fixed 237 * - hex 238 * - internal 239 * - left 240 * - oct 241 * - right 242 * - scientific 243 * - showbase 244 * - showpoint 245 * - showpos 246 * - skipws 247 * - unitbuf 248 * - uppercase 249 * - adjustfield 250 * - basefield 251 * - floatfield 252 */ 253 typedef _Ios_Fmtflags fmtflags; 254 255 /// Insert/extract @c bool in alphabetic rather than numeric format. 256 static const fmtflags boolalpha = _S_boolalpha; 257 258 /// Converts integer input or generates integer output in decimal base. 259 static const fmtflags dec = _S_dec; 260 261 /// Generate floating-point output in fixed-point notation. 262 static const fmtflags fixed = _S_fixed; 263 264 /// Converts integer input or generates integer output in hexadecimal base. 265 static const fmtflags hex = _S_hex; 266 267 /// Adds fill characters at a designated internal point in certain 268 /// generated output, or identical to @c right if no such point is 269 /// designated. 270 static const fmtflags internal = _S_internal; 271 272 /// Adds fill characters on the right (final positions) of certain 273 /// generated output. (I.e., the thing you print is flush left.) 274 static const fmtflags left = _S_left; 275 276 /// Converts integer input or generates integer output in octal base. 277 static const fmtflags oct = _S_oct; 278 279 /// Adds fill characters on the left (initial positions) of certain 280 /// generated output. (I.e., the thing you print is flush right.) 281 static const fmtflags right = _S_right; 282 283 /// Generates floating-point output in scientific notation. 284 static const fmtflags scientific = _S_scientific; 285 286 /// Generates a prefix indicating the numeric base of generated integer 287 /// output. 288 static const fmtflags showbase = _S_showbase; 289 290 /// Generates a decimal-point character unconditionally in generated 291 /// floating-point output. 292 static const fmtflags showpoint = _S_showpoint; 293 294 /// Generates a + sign in non-negative generated numeric output. 295 static const fmtflags showpos = _S_showpos; 296 297 /// Skips leading white space before certain input operations. 298 static const fmtflags skipws = _S_skipws; 299 300 /// Flushes output after each output operation. 301 static const fmtflags unitbuf = _S_unitbuf; 302 303 /// Replaces certain lowercase letters with their uppercase equivalents 304 /// in generated output. 305 static const fmtflags uppercase = _S_uppercase; 306 307 /// A mask of left|right|internal. Useful for the 2-arg form of @c setf. 308 static const fmtflags adjustfield = _S_adjustfield; 309 310 /// A mask of dec|oct|hex. Useful for the 2-arg form of @c setf. 311 static const fmtflags basefield = _S_basefield; 312 313 /// A mask of scientific|fixed. Useful for the 2-arg form of @c setf. 314 static const fmtflags floatfield = _S_floatfield; 315 316 // 27.4.2.1.3 Type ios_base::iostate 317 /** 318 * @brief This is a bitmask type. 319 * 320 * @c "_Ios_Iostate" is implementation-defined, but it is valid to 321 * perform bitwise operations on these values and expect the Right 322 * Thing to happen. Defined objects of type iostate are: 323 * - badbit 324 * - eofbit 325 * - failbit 326 * - goodbit 327 */ 328 typedef _Ios_Iostate iostate; 329 330 /// Indicates a loss of integrity in an input or output sequence (such 331 /// as an irrecoverable read error from a file). 332 static const iostate badbit = _S_badbit; 333 334 /// Indicates that an input operation reached the end of an input sequence. 335 static const iostate eofbit = _S_eofbit; 336 337 /// Indicates that an input operation failed to read the expected 338 /// characters, or that an output operation failed to generate the 339 /// desired characters. 340 static const iostate failbit = _S_failbit; 341 342 /// Indicates all is well. 343 static const iostate goodbit = _S_goodbit; 344 345 // 27.4.2.1.4 Type ios_base::openmode 346 /** 347 * @brief This is a bitmask type. 348 * 349 * @c "_Ios_Openmode" is implementation-defined, but it is valid to 350 * perform bitwise operations on these values and expect the Right 351 * Thing to happen. Defined objects of type openmode are: 352 * - app 353 * - ate 354 * - binary 355 * - in 356 * - out 357 * - trunc 358 */ 359 typedef _Ios_Openmode openmode; 360 361 /// Seek to end before each write. 362 static const openmode app = _S_app; 363 364 /// Open and seek to end immediately after opening. 365 static const openmode ate = _S_ate; 366 367 /// Perform input and output in binary mode (as opposed to text mode). 368 /// This is probably not what you think it is; see 369 /// http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#3 and 370 /// http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#7 for more. 371 static const openmode binary = _S_bin; 372 373 /// Open for input. Default for @c ifstream and fstream. 374 static const openmode in = _S_in; 375 376 /// Open for output. Default for @c ofstream and fstream. 377 static const openmode out = _S_out; 378 379 /// Open for input. Default for @c ofstream. 380 static const openmode trunc = _S_trunc; 381 382 // 27.4.2.1.5 Type ios_base::seekdir 383 /** 384 * @brief This is an enumerated type. 385 * 386 * @c "_Ios_Seekdir" is implementation-defined. Defined values 387 * of type seekdir are: 388 * - beg 389 * - cur, equivalent to @c SEEK_CUR in the C standard library. 390 * - end, equivalent to @c SEEK_END in the C standard library. 391 */ 392 typedef _Ios_Seekdir seekdir; 393 394 /// Request a seek relative to the beginning of the stream. 395 static const seekdir beg = _S_beg; 396 397 /// Request a seek relative to the current position within the sequence. 398 static const seekdir cur = _S_cur; 399 400 /// Request a seek relative to the current end of the sequence. 401 static const seekdir end = _S_end; 402 403 // Annex D.6 404 typedef int io_state; 405 typedef int open_mode; 406 typedef int seek_dir; 407 408 typedef std::streampos streampos; 409 typedef std::streamoff streamoff; 410 411 // Callbacks; 412 /** 413 * @brief The set of events that may be passed to an event callback. 414 * 415 * erase_event is used during ~ios() and copyfmt(). imbue_event is used 416 * during imbue(). copyfmt_event is used during copyfmt(). 417 */ 418 enum event 419 { 420 erase_event, 421 imbue_event, 422 copyfmt_event 423 }; 424 425 /** 426 * @brief The type of an event callback function. 427 * @param event One of the members of the event enum. 428 * @param ios_base Reference to the ios_base object. 429 * @param int The integer provided when the callback was registered. 430 * 431 * Event callbacks are user defined functions that get called during 432 * several ios_base and basic_ios functions, specifically imbue(), 433 * copyfmt(), and ~ios(). 434 */ 435 typedef void (*event_callback) (event, ios_base&, int); 436 437 /** 438 * @brief Add the callback __fn with parameter __index. 439 * @param __fn The function to add. 440 * @param __index The integer to pass to the function when invoked. 441 * 442 * Registers a function as an event callback with an integer parameter to 443 * be passed to the function when invoked. Multiple copies of the 444 * function are allowed. If there are multiple callbacks, they are 445 * invoked in the order they were registered. 446 */ 447 void 448 register_callback(event_callback __fn, int __index); 449 450 protected: 451 //@{ 452 /** 453 * @if maint 454 * ios_base data members (doc me) 455 * @endif 456 */ 457 streamsize _M_precision; 458 streamsize _M_width; 459 fmtflags _M_flags; 460 iostate _M_exception; 461 iostate _M_streambuf_state; 462 //@} 463 464 // 27.4.2.6 Members for callbacks 465 // 27.4.2.6 ios_base callbacks 466 struct _Callback_list 467 { 468 // Data Members 469 _Callback_list* _M_next; 470 ios_base::event_callback _M_fn; 471 int _M_index; 472 _Atomic_word _M_refcount; // 0 means one reference. 473 474 _Callback_list(ios_base::event_callback __fn, int __index, 475 _Callback_list* __cb) 476 : _M_next(__cb), _M_fn(__fn), _M_index(__index), _M_refcount(0) { } 477 478 void 479 _M_add_reference() { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 480 481 // 0 => OK to delete. 482 int 483 _M_remove_reference() 484 { return __gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1); } 485 }; 486 487 _Callback_list* _M_callbacks; 488 489 void 490 _M_call_callbacks(event __ev) throw(); 491 492 void 493 _M_dispose_callbacks(void); 494 495 // 27.4.2.5 Members for iword/pword storage 496 struct _Words 497 { 498 void* _M_pword; 499 long _M_iword; 500 _Words() : _M_pword(0), _M_iword(0) { } 501 }; 502 503 // Only for failed iword/pword calls. 504 _Words _M_word_zero; 505 506 // Guaranteed storage. 507 // The first 5 iword and pword slots are reserved for internal use. 508 enum { _S_local_word_size = 8 }; 509 _Words _M_local_word[_S_local_word_size]; 510 511 // Allocated storage. 512 int _M_word_size; 513 _Words* _M_word; 514 515 _Words& 516 _M_grow_words(int __index, bool __iword); 517 518 // Members for locale and locale caching. 519 locale _M_ios_locale; 520 521 void 522 _M_init(); 523 524 public: 525 526 // 27.4.2.1.6 Class ios_base::Init 527 // Used to initialize standard streams. In theory, g++ could use 528 // -finit-priority to order this stuff correctly without going 529 // through these machinations. 530 class Init 531 { 532 friend class ios_base; 533 public: 534 Init(); 535 ~Init(); 536 537 private: 538 static _Atomic_word _S_refcount; 539 static bool _S_synced_with_stdio; 540 }; 541 542 // [27.4.2.2] fmtflags state functions 543 /** 544 * @brief Access to format flags. 545 * @return The format control flags for both input and output. 546 */ 547 inline fmtflags 548 flags() const { return _M_flags; } 549 550 /** 551 * @brief Setting new format flags all at once. 552 * @param fmtfl The new flags to set. 553 * @return The previous format control flags. 554 * 555 * This function overwrites all the format flags with @a fmtfl. 556 */ 557 inline fmtflags 558 flags(fmtflags __fmtfl) 559 { 560 fmtflags __old = _M_flags; 561 _M_flags = __fmtfl; 562 return __old; 563 } 564 565 /** 566 * @brief Setting new format flags. 567 * @param fmtfl Additional flags to set. 568 * @return The previous format control flags. 569 * 570 * This function sets additional flags in format control. Flags that 571 * were previously set remain set. 572 */ 573 inline fmtflags 574 setf(fmtflags __fmtfl) 575 { 576 fmtflags __old = _M_flags; 577 _M_flags |= __fmtfl; 578 return __old; 579 } 580 581 /** 582 * @brief Setting new format flags. 583 * @param fmtfl Additional flags to set. 584 * @param mask The flags mask for @a fmtfl. 585 * @return The previous format control flags. 586 * 587 * This function clears @a mask in the format flags, then sets 588 * @a fmtfl @c & @a mask. An example mask is @c ios_base::adjustfield. 589 */ 590 inline fmtflags 591 setf(fmtflags __fmtfl, fmtflags __mask) 592 { 593 fmtflags __old = _M_flags; 594 _M_flags &= ~__mask; 595 _M_flags |= (__fmtfl & __mask); 596 return __old; 597 } 598 599 /** 600 * @brief Clearing format flags. 601 * @param mask The flags to unset. 602 * 603 * This function clears @a mask in the format flags. 604 */ 605 inline void 606 unsetf(fmtflags __mask) { _M_flags &= ~__mask; } 607 608 /** 609 * @brief Flags access. 610 * @return The precision to generate on certain output operations. 611 * 612 * @if maint 613 * Be careful if you try to give a definition of "precision" here; see 614 * DR 189. 615 * @endif 616 */ 617 inline streamsize 618 precision() const { return _M_precision; } 619 620 /** 621 * @brief Changing flags. 622 * @param prec The new precision value. 623 * @return The previous value of precision(). 624 */ 625 inline streamsize 626 precision(streamsize __prec) 627 { 628 streamsize __old = _M_precision; 629 _M_precision = __prec; 630 return __old; 631 } 632 633 /** 634 * @brief Flags access. 635 * @return The minimum field width to generate on output operations. 636 * 637 * "Minimum field width" refers to the number of characters. 638 */ 639 inline streamsize 640 width() const { return _M_width; } 641 642 /** 643 * @brief Changing flags. 644 * @param wide The new width value. 645 * @return The previous value of width(). 646 */ 647 inline streamsize 648 width(streamsize __wide) 649 { 650 streamsize __old = _M_width; 651 _M_width = __wide; 652 return __old; 653 } 654 655 // [27.4.2.4] ios_base static members 656 /** 657 * @brief Interaction with the standard C I/O objects. 658 * @param sync Whether to synchronize or not. 659 * @return True if the standard streams were previously synchronized. 660 * 661 * The synchronization referred to is @e only that between the standard 662 * C facilities (e.g., stdout) and the standard C++ objects (e.g., 663 * cout). User-declared streams are unaffected. See 664 * http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#8 for more. 665 */ 666 static bool 667 sync_with_stdio(bool __sync = true); 668 669 // [27.4.2.3] ios_base locale functions 670 /** 671 * @brief Setting a new locale. 672 * @param loc The new locale. 673 * @return The previous locale. 674 * 675 * Sets the new locale for this stream, and then invokes each callback 676 * with imbue_event. 677 */ 678 locale 679 imbue(const locale& __loc); 680 681 /** 682 * @brief Locale access 683 * @return A copy of the current locale. 684 * 685 * If @c imbue(loc) has previously been called, then this function 686 * returns @c loc. Otherwise, it returns a copy of @c std::locale(), 687 * the global C++ locale. 688 */ 689 inline locale 690 getloc() const { return _M_ios_locale; } 691 692 /** 693 * @brief Locale access 694 * @return A reference to the current locale. 695 * 696 * Like getloc above, but returns a reference instead of 697 * generating a copy. 698 */ 699 inline const locale& 700 _M_getloc() const { return _M_ios_locale; } 701 702 // [27.4.2.5] ios_base storage functions 703 /** 704 * @brief Access to unique indices. 705 * @return An integer different from all previous calls. 706 * 707 * This function returns a unique integer every time it is called. It 708 * can be used for any purpose, but is primarily intended to be a unique 709 * index for the iword and pword functions. The expectation is that an 710 * application calls xalloc in order to obtain an index in the iword and 711 * pword arrays that can be used without fear of conflict. 712 * 713 * The implementation maintains a static variable that is incremented and 714 * returned on each invocation. xalloc is guaranteed to return an index 715 * that is safe to use in the iword and pword arrays. 716 */ 717 static int 718 xalloc() throw(); 719 720 /** 721 * @brief Access to integer array. 722 * @param __ix Index into the array. 723 * @return A reference to an integer associated with the index. 724 * 725 * The iword function provides access to an array of integers that can be 726 * used for any purpose. The array grows as required to hold the 727 * supplied index. All integers in the array are initialized to 0. 728 * 729 * The implementation reserves several indices. You should use xalloc to 730 * obtain an index that is safe to use. Also note that since the array 731 * can grow dynamically, it is not safe to hold onto the reference. 732 */ 733 inline long& 734 iword(int __ix) 735 { 736 _Words& __word = (__ix < _M_word_size) 737 ? _M_word[__ix] : _M_grow_words(__ix, true); 738 return __word._M_iword; 739 } 740 741 /** 742 * @brief Access to void pointer array. 743 * @param __ix Index into the array. 744 * @return A reference to a void* associated with the index. 745 * 746 * The pword function provides access to an array of pointers that can be 747 * used for any purpose. The array grows as required to hold the 748 * supplied index. All pointers in the array are initialized to 0. 749 * 750 * The implementation reserves several indices. You should use xalloc to 751 * obtain an index that is safe to use. Also note that since the array 752 * can grow dynamically, it is not safe to hold onto the reference. 753 */ 754 inline void*& 755 pword(int __ix) 756 { 757 _Words& __word = (__ix < _M_word_size) 758 ? _M_word[__ix] : _M_grow_words(__ix, false); 759 return __word._M_pword; 760 } 761 762 // Destructor 763 /** 764 * Invokes each callback with erase_event. Destroys local storage. 765 * 766 * Note that the ios_base object for the standard streams never gets 767 * destroyed. As a result, any callbacks registered with the standard 768 * streams will not get invoked with erase_event (unless copyfmt is 769 * used). 770 */ 771 virtual ~ios_base(); 772 773 protected: 774 ios_base(); 775 776 // _GLIBCXX_RESOLVE_LIB_DEFECTS 777 // 50. Copy constructor and assignment operator of ios_base 778 private: 779 ios_base(const ios_base&); 780 781 ios_base& 782 operator=(const ios_base&); 783 }; 784 785 // [27.4.5.1] fmtflags manipulators 786 /// Calls base.setf(ios_base::boolalpha). 787 inline ios_base& 788 boolalpha(ios_base& __base) 789 { 790 __base.setf(ios_base::boolalpha); 791 return __base; 792 } 793 794 /// Calls base.unsetf(ios_base::boolalpha). 795 inline ios_base& 796 noboolalpha(ios_base& __base) 797 { 798 __base.unsetf(ios_base::boolalpha); 799 return __base; 800 } 801 802 /// Calls base.setf(ios_base::showbase). 803 inline ios_base& 804 showbase(ios_base& __base) 805 { 806 __base.setf(ios_base::showbase); 807 return __base; 808 } 809 810 /// Calls base.unsetf(ios_base::showbase). 811 inline ios_base& 812 noshowbase(ios_base& __base) 813 { 814 __base.unsetf(ios_base::showbase); 815 return __base; 816 } 817 818 /// Calls base.setf(ios_base::showpoint). 819 inline ios_base& 820 showpoint(ios_base& __base) 821 { 822 __base.setf(ios_base::showpoint); 823 return __base; 824 } 825 826 /// Calls base.unsetf(ios_base::showpoint). 827 inline ios_base& 828 noshowpoint(ios_base& __base) 829 { 830 __base.unsetf(ios_base::showpoint); 831 return __base; 832 } 833 834 /// Calls base.setf(ios_base::showpos). 835 inline ios_base& 836 showpos(ios_base& __base) 837 { 838 __base.setf(ios_base::showpos); 839 return __base; 840 } 841 842 /// Calls base.unsetf(ios_base::showpos). 843 inline ios_base& 844 noshowpos(ios_base& __base) 845 { 846 __base.unsetf(ios_base::showpos); 847 return __base; 848 } 849 850 /// Calls base.setf(ios_base::skipws). 851 inline ios_base& 852 skipws(ios_base& __base) 853 { 854 __base.setf(ios_base::skipws); 855 return __base; 856 } 857 858 /// Calls base.unsetf(ios_base::skipws). 859 inline ios_base& 860 noskipws(ios_base& __base) 861 { 862 __base.unsetf(ios_base::skipws); 863 return __base; 864 } 865 866 /// Calls base.setf(ios_base::uppercase). 867 inline ios_base& 868 uppercase(ios_base& __base) 869 { 870 __base.setf(ios_base::uppercase); 871 return __base; 872 } 873 874 /// Calls base.unsetf(ios_base::uppercase). 875 inline ios_base& 876 nouppercase(ios_base& __base) 877 { 878 __base.unsetf(ios_base::uppercase); 879 return __base; 880 } 881 882 /// Calls base.setf(ios_base::unitbuf). 883 inline ios_base& 884 unitbuf(ios_base& __base) 885 { 886 __base.setf(ios_base::unitbuf); 887 return __base; 888 } 889 890 /// Calls base.unsetf(ios_base::unitbuf). 891 inline ios_base& 892 nounitbuf(ios_base& __base) 893 { 894 __base.unsetf(ios_base::unitbuf); 895 return __base; 896 } 897 898 // [27.4.5.2] adjustfield anipulators 899 /// Calls base.setf(ios_base::internal, ios_base::adjustfield). 900 inline ios_base& 901 internal(ios_base& __base) 902 { 903 __base.setf(ios_base::internal, ios_base::adjustfield); 904 return __base; 905 } 906 907 /// Calls base.setf(ios_base::left, ios_base::adjustfield). 908 inline ios_base& 909 left(ios_base& __base) 910 { 911 __base.setf(ios_base::left, ios_base::adjustfield); 912 return __base; 913 } 914 915 /// Calls base.setf(ios_base::right, ios_base::adjustfield). 916 inline ios_base& 917 right(ios_base& __base) 918 { 919 __base.setf(ios_base::right, ios_base::adjustfield); 920 return __base; 921 } 922 923 // [27.4.5.3] basefield anipulators 924 /// Calls base.setf(ios_base::dec, ios_base::basefield). 925 inline ios_base& 926 dec(ios_base& __base) 927 { 928 __base.setf(ios_base::dec, ios_base::basefield); 929 return __base; 930 } 931 932 /// Calls base.setf(ios_base::hex, ios_base::basefield). 933 inline ios_base& 934 hex(ios_base& __base) 935 { 936 __base.setf(ios_base::hex, ios_base::basefield); 937 return __base; 938 } 939 940 /// Calls base.setf(ios_base::oct, ios_base::basefield). 941 inline ios_base& 942 oct(ios_base& __base) 943 { 944 __base.setf(ios_base::oct, ios_base::basefield); 945 return __base; 946 } 947 948 // [27.4.5.4] floatfield anipulators 949 /// Calls base.setf(ios_base::fixed, ios_base::floatfield). 950 inline ios_base& 951 fixed(ios_base& __base) 952 { 953 __base.setf(ios_base::fixed, ios_base::floatfield); 954 return __base; 955 } 956 957 /// Calls base.setf(ios_base::scientific, ios_base::floatfield). 958 inline ios_base& 959 scientific(ios_base& __base) 960 { 961 __base.setf(ios_base::scientific, ios_base::floatfield); 962 return __base; 963 } 964 965_GLIBCXX_END_NAMESPACE 966 967#endif /* _IOS_BASE_H */ 968 969