libstdc++
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00001 // Iostreams base classes -*- C++ -*- 00002 00003 // Copyright (C) 1997-2015 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file bits/ios_base.h 00026 * This is an internal header file, included by other library headers. 00027 * Do not attempt to use it directly. @headername{ios} 00028 */ 00029 00030 // 00031 // ISO C++ 14882: 27.4 Iostreams base classes 00032 // 00033 00034 #ifndef _IOS_BASE_H 00035 #define _IOS_BASE_H 1 00036 00037 #pragma GCC system_header 00038 00039 #include <ext/atomicity.h> 00040 #include <bits/localefwd.h> 00041 #include <bits/locale_classes.h> 00042 00043 #if __cplusplus < 201103L 00044 # include <stdexcept> 00045 #else 00046 # include <system_error> 00047 #endif 00048 00049 namespace std _GLIBCXX_VISIBILITY(default) 00050 { 00051 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00052 00053 // The following definitions of bitmask types are enums, not ints, 00054 // as permitted (but not required) in the standard, in order to provide 00055 // better type safety in iostream calls. A side effect is that 00056 // expressions involving them are no longer compile-time constants. 00057 enum _Ios_Fmtflags 00058 { 00059 _S_boolalpha = 1L << 0, 00060 _S_dec = 1L << 1, 00061 _S_fixed = 1L << 2, 00062 _S_hex = 1L << 3, 00063 _S_internal = 1L << 4, 00064 _S_left = 1L << 5, 00065 _S_oct = 1L << 6, 00066 _S_right = 1L << 7, 00067 _S_scientific = 1L << 8, 00068 _S_showbase = 1L << 9, 00069 _S_showpoint = 1L << 10, 00070 _S_showpos = 1L << 11, 00071 _S_skipws = 1L << 12, 00072 _S_unitbuf = 1L << 13, 00073 _S_uppercase = 1L << 14, 00074 _S_adjustfield = _S_left | _S_right | _S_internal, 00075 _S_basefield = _S_dec | _S_oct | _S_hex, 00076 _S_floatfield = _S_scientific | _S_fixed, 00077 _S_ios_fmtflags_end = 1L << 16, 00078 _S_ios_fmtflags_max = __INT_MAX__, 00079 _S_ios_fmtflags_min = ~__INT_MAX__ 00080 }; 00081 00082 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags 00083 operator&(_Ios_Fmtflags __a, _Ios_Fmtflags __b) 00084 { return _Ios_Fmtflags(static_cast<int>(__a) & static_cast<int>(__b)); } 00085 00086 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags 00087 operator|(_Ios_Fmtflags __a, _Ios_Fmtflags __b) 00088 { return _Ios_Fmtflags(static_cast<int>(__a) | static_cast<int>(__b)); } 00089 00090 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags 00091 operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b) 00092 { return _Ios_Fmtflags(static_cast<int>(__a) ^ static_cast<int>(__b)); } 00093 00094 inline _GLIBCXX_CONSTEXPR _Ios_Fmtflags 00095 operator~(_Ios_Fmtflags __a) 00096 { return _Ios_Fmtflags(~static_cast<int>(__a)); } 00097 00098 inline const _Ios_Fmtflags& 00099 operator|=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 00100 { return __a = __a | __b; } 00101 00102 inline const _Ios_Fmtflags& 00103 operator&=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 00104 { return __a = __a & __b; } 00105 00106 inline const _Ios_Fmtflags& 00107 operator^=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b) 00108 { return __a = __a ^ __b; } 00109 00110 00111 enum _Ios_Openmode 00112 { 00113 _S_app = 1L << 0, 00114 _S_ate = 1L << 1, 00115 _S_bin = 1L << 2, 00116 _S_in = 1L << 3, 00117 _S_out = 1L << 4, 00118 _S_trunc = 1L << 5, 00119 _S_ios_openmode_end = 1L << 16, 00120 _S_ios_openmode_max = __INT_MAX__, 00121 _S_ios_openmode_min = ~__INT_MAX__ 00122 }; 00123 00124 inline _GLIBCXX_CONSTEXPR _Ios_Openmode 00125 operator&(_Ios_Openmode __a, _Ios_Openmode __b) 00126 { return _Ios_Openmode(static_cast<int>(__a) & static_cast<int>(__b)); } 00127 00128 inline _GLIBCXX_CONSTEXPR _Ios_Openmode 00129 operator|(_Ios_Openmode __a, _Ios_Openmode __b) 00130 { return _Ios_Openmode(static_cast<int>(__a) | static_cast<int>(__b)); } 00131 00132 inline _GLIBCXX_CONSTEXPR _Ios_Openmode 00133 operator^(_Ios_Openmode __a, _Ios_Openmode __b) 00134 { return _Ios_Openmode(static_cast<int>(__a) ^ static_cast<int>(__b)); } 00135 00136 inline _GLIBCXX_CONSTEXPR _Ios_Openmode 00137 operator~(_Ios_Openmode __a) 00138 { return _Ios_Openmode(~static_cast<int>(__a)); } 00139 00140 inline const _Ios_Openmode& 00141 operator|=(_Ios_Openmode& __a, _Ios_Openmode __b) 00142 { return __a = __a | __b; } 00143 00144 inline const _Ios_Openmode& 00145 operator&=(_Ios_Openmode& __a, _Ios_Openmode __b) 00146 { return __a = __a & __b; } 00147 00148 inline const _Ios_Openmode& 00149 operator^=(_Ios_Openmode& __a, _Ios_Openmode __b) 00150 { return __a = __a ^ __b; } 00151 00152 00153 enum _Ios_Iostate 00154 { 00155 _S_goodbit = 0, 00156 _S_badbit = 1L << 0, 00157 _S_eofbit = 1L << 1, 00158 _S_failbit = 1L << 2, 00159 _S_ios_iostate_end = 1L << 16, 00160 _S_ios_iostate_max = __INT_MAX__, 00161 _S_ios_iostate_min = ~__INT_MAX__ 00162 }; 00163 00164 inline _GLIBCXX_CONSTEXPR _Ios_Iostate 00165 operator&(_Ios_Iostate __a, _Ios_Iostate __b) 00166 { return _Ios_Iostate(static_cast<int>(__a) & static_cast<int>(__b)); } 00167 00168 inline _GLIBCXX_CONSTEXPR _Ios_Iostate 00169 operator|(_Ios_Iostate __a, _Ios_Iostate __b) 00170 { return _Ios_Iostate(static_cast<int>(__a) | static_cast<int>(__b)); } 00171 00172 inline _GLIBCXX_CONSTEXPR _Ios_Iostate 00173 operator^(_Ios_Iostate __a, _Ios_Iostate __b) 00174 { return _Ios_Iostate(static_cast<int>(__a) ^ static_cast<int>(__b)); } 00175 00176 inline _GLIBCXX_CONSTEXPR _Ios_Iostate 00177 operator~(_Ios_Iostate __a) 00178 { return _Ios_Iostate(~static_cast<int>(__a)); } 00179 00180 inline const _Ios_Iostate& 00181 operator|=(_Ios_Iostate& __a, _Ios_Iostate __b) 00182 { return __a = __a | __b; } 00183 00184 inline const _Ios_Iostate& 00185 operator&=(_Ios_Iostate& __a, _Ios_Iostate __b) 00186 { return __a = __a & __b; } 00187 00188 inline const _Ios_Iostate& 00189 operator^=(_Ios_Iostate& __a, _Ios_Iostate __b) 00190 { return __a = __a ^ __b; } 00191 00192 00193 enum _Ios_Seekdir 00194 { 00195 _S_beg = 0, 00196 _S_cur = _GLIBCXX_STDIO_SEEK_CUR, 00197 _S_end = _GLIBCXX_STDIO_SEEK_END, 00198 _S_ios_seekdir_end = 1L << 16 00199 }; 00200 00201 #if __cplusplus >= 201103L 00202 /// I/O error code 00203 enum class io_errc { stream = 1 }; 00204 00205 template <> struct is_error_code_enum<io_errc> : public true_type { }; 00206 00207 const error_category& iostream_category() noexcept; 00208 00209 inline error_code 00210 make_error_code(io_errc e) noexcept 00211 { return error_code(static_cast<int>(e), iostream_category()); } 00212 00213 inline error_condition 00214 make_error_condition(io_errc e) noexcept 00215 { return error_condition(static_cast<int>(e), iostream_category()); } 00216 #endif 00217 00218 // 27.4.2 Class ios_base 00219 /** 00220 * @brief The base of the I/O class hierarchy. 00221 * @ingroup io 00222 * 00223 * This class defines everything that can be defined about I/O that does 00224 * not depend on the type of characters being input or output. Most 00225 * people will only see @c ios_base when they need to specify the full 00226 * name of the various I/O flags (e.g., the openmodes). 00227 */ 00228 class ios_base 00229 { 00230 #if _GLIBCXX_USE_CXX11_ABI 00231 #if __cplusplus < 201103L 00232 // Type that is layout-compatible with std::system_error 00233 struct system_error : std::runtime_error 00234 { 00235 // Type that is layout-compatible with std::error_code 00236 struct error_code 00237 { 00238 error_code() { } 00239 private: 00240 int _M_value; 00241 const void* _M_cat; 00242 } _M_code; 00243 }; 00244 #endif 00245 #endif 00246 public: 00247 00248 /** 00249 * @brief These are thrown to indicate problems with io. 00250 * @ingroup exceptions 00251 * 00252 * 27.4.2.1.1 Class ios_base::failure 00253 */ 00254 #if _GLIBCXX_USE_CXX11_ABI 00255 class _GLIBCXX_ABI_TAG_CXX11 failure : public system_error 00256 { 00257 public: 00258 explicit 00259 failure(const string& __str); 00260 00261 #if __cplusplus >= 201103L 00262 explicit 00263 failure(const string&, const error_code&); 00264 00265 explicit 00266 failure(const char*, const error_code& = io_errc::stream); 00267 #endif 00268 00269 virtual 00270 ~failure() throw(); 00271 00272 virtual const char* 00273 what() const throw(); 00274 }; 00275 #else 00276 class failure : public exception 00277 { 00278 public: 00279 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00280 // 48. Use of non-existent exception constructor 00281 explicit 00282 failure(const string& __str) throw(); 00283 00284 // This declaration is not useless: 00285 // http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/Vague-Linkage.html 00286 virtual 00287 ~failure() throw(); 00288 00289 virtual const char* 00290 what() const throw(); 00291 00292 private: 00293 string _M_msg; 00294 }; 00295 #endif 00296 00297 // 27.4.2.1.2 Type ios_base::fmtflags 00298 /** 00299 * @brief This is a bitmask type. 00300 * 00301 * @c @a _Ios_Fmtflags is implementation-defined, but it is valid to 00302 * perform bitwise operations on these values and expect the Right 00303 * Thing to happen. Defined objects of type fmtflags are: 00304 * - boolalpha 00305 * - dec 00306 * - fixed 00307 * - hex 00308 * - internal 00309 * - left 00310 * - oct 00311 * - right 00312 * - scientific 00313 * - showbase 00314 * - showpoint 00315 * - showpos 00316 * - skipws 00317 * - unitbuf 00318 * - uppercase 00319 * - adjustfield 00320 * - basefield 00321 * - floatfield 00322 */ 00323 typedef _Ios_Fmtflags fmtflags; 00324 00325 /// Insert/extract @c bool in alphabetic rather than numeric format. 00326 static const fmtflags boolalpha = _S_boolalpha; 00327 00328 /// Converts integer input or generates integer output in decimal base. 00329 static const fmtflags dec = _S_dec; 00330 00331 /// Generate floating-point output in fixed-point notation. 00332 static const fmtflags fixed = _S_fixed; 00333 00334 /// Converts integer input or generates integer output in hexadecimal base. 00335 static const fmtflags hex = _S_hex; 00336 00337 /// Adds fill characters at a designated internal point in certain 00338 /// generated output, or identical to @c right if no such point is 00339 /// designated. 00340 static const fmtflags internal = _S_internal; 00341 00342 /// Adds fill characters on the right (final positions) of certain 00343 /// generated output. (I.e., the thing you print is flush left.) 00344 static const fmtflags left = _S_left; 00345 00346 /// Converts integer input or generates integer output in octal base. 00347 static const fmtflags oct = _S_oct; 00348 00349 /// Adds fill characters on the left (initial positions) of certain 00350 /// generated output. (I.e., the thing you print is flush right.) 00351 static const fmtflags right = _S_right; 00352 00353 /// Generates floating-point output in scientific notation. 00354 static const fmtflags scientific = _S_scientific; 00355 00356 /// Generates a prefix indicating the numeric base of generated integer 00357 /// output. 00358 static const fmtflags showbase = _S_showbase; 00359 00360 /// Generates a decimal-point character unconditionally in generated 00361 /// floating-point output. 00362 static const fmtflags showpoint = _S_showpoint; 00363 00364 /// Generates a + sign in non-negative generated numeric output. 00365 static const fmtflags showpos = _S_showpos; 00366 00367 /// Skips leading white space before certain input operations. 00368 static const fmtflags skipws = _S_skipws; 00369 00370 /// Flushes output after each output operation. 00371 static const fmtflags unitbuf = _S_unitbuf; 00372 00373 /// Replaces certain lowercase letters with their uppercase equivalents 00374 /// in generated output. 00375 static const fmtflags uppercase = _S_uppercase; 00376 00377 /// A mask of left|right|internal. Useful for the 2-arg form of @c setf. 00378 static const fmtflags adjustfield = _S_adjustfield; 00379 00380 /// A mask of dec|oct|hex. Useful for the 2-arg form of @c setf. 00381 static const fmtflags basefield = _S_basefield; 00382 00383 /// A mask of scientific|fixed. Useful for the 2-arg form of @c setf. 00384 static const fmtflags floatfield = _S_floatfield; 00385 00386 // 27.4.2.1.3 Type ios_base::iostate 00387 /** 00388 * @brief This is a bitmask type. 00389 * 00390 * @c @a _Ios_Iostate is implementation-defined, but it is valid to 00391 * perform bitwise operations on these values and expect the Right 00392 * Thing to happen. Defined objects of type iostate are: 00393 * - badbit 00394 * - eofbit 00395 * - failbit 00396 * - goodbit 00397 */ 00398 typedef _Ios_Iostate iostate; 00399 00400 /// Indicates a loss of integrity in an input or output sequence (such 00401 /// as an irrecoverable read error from a file). 00402 static const iostate badbit = _S_badbit; 00403 00404 /// Indicates that an input operation reached the end of an input sequence. 00405 static const iostate eofbit = _S_eofbit; 00406 00407 /// Indicates that an input operation failed to read the expected 00408 /// characters, or that an output operation failed to generate the 00409 /// desired characters. 00410 static const iostate failbit = _S_failbit; 00411 00412 /// Indicates all is well. 00413 static const iostate goodbit = _S_goodbit; 00414 00415 // 27.4.2.1.4 Type ios_base::openmode 00416 /** 00417 * @brief This is a bitmask type. 00418 * 00419 * @c @a _Ios_Openmode is implementation-defined, but it is valid to 00420 * perform bitwise operations on these values and expect the Right 00421 * Thing to happen. Defined objects of type openmode are: 00422 * - app 00423 * - ate 00424 * - binary 00425 * - in 00426 * - out 00427 * - trunc 00428 */ 00429 typedef _Ios_Openmode openmode; 00430 00431 /// Seek to end before each write. 00432 static const openmode app = _S_app; 00433 00434 /// Open and seek to end immediately after opening. 00435 static const openmode ate = _S_ate; 00436 00437 /// Perform input and output in binary mode (as opposed to text mode). 00438 /// This is probably not what you think it is; see 00439 /// https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary 00440 static const openmode binary = _S_bin; 00441 00442 /// Open for input. Default for @c ifstream and fstream. 00443 static const openmode in = _S_in; 00444 00445 /// Open for output. Default for @c ofstream and fstream. 00446 static const openmode out = _S_out; 00447 00448 /// Open for input. Default for @c ofstream. 00449 static const openmode trunc = _S_trunc; 00450 00451 // 27.4.2.1.5 Type ios_base::seekdir 00452 /** 00453 * @brief This is an enumerated type. 00454 * 00455 * @c @a _Ios_Seekdir is implementation-defined. Defined values 00456 * of type seekdir are: 00457 * - beg 00458 * - cur, equivalent to @c SEEK_CUR in the C standard library. 00459 * - end, equivalent to @c SEEK_END in the C standard library. 00460 */ 00461 typedef _Ios_Seekdir seekdir; 00462 00463 /// Request a seek relative to the beginning of the stream. 00464 static const seekdir beg = _S_beg; 00465 00466 /// Request a seek relative to the current position within the sequence. 00467 static const seekdir cur = _S_cur; 00468 00469 /// Request a seek relative to the current end of the sequence. 00470 static const seekdir end = _S_end; 00471 00472 // Annex D.6 00473 typedef int io_state; 00474 typedef int open_mode; 00475 typedef int seek_dir; 00476 00477 typedef std::streampos streampos; 00478 typedef std::streamoff streamoff; 00479 00480 // Callbacks; 00481 /** 00482 * @brief The set of events that may be passed to an event callback. 00483 * 00484 * erase_event is used during ~ios() and copyfmt(). imbue_event is used 00485 * during imbue(). copyfmt_event is used during copyfmt(). 00486 */ 00487 enum event 00488 { 00489 erase_event, 00490 imbue_event, 00491 copyfmt_event 00492 }; 00493 00494 /** 00495 * @brief The type of an event callback function. 00496 * @param __e One of the members of the event enum. 00497 * @param __b Reference to the ios_base object. 00498 * @param __i The integer provided when the callback was registered. 00499 * 00500 * Event callbacks are user defined functions that get called during 00501 * several ios_base and basic_ios functions, specifically imbue(), 00502 * copyfmt(), and ~ios(). 00503 */ 00504 typedef void (*event_callback) (event __e, ios_base& __b, int __i); 00505 00506 /** 00507 * @brief Add the callback __fn with parameter __index. 00508 * @param __fn The function to add. 00509 * @param __index The integer to pass to the function when invoked. 00510 * 00511 * Registers a function as an event callback with an integer parameter to 00512 * be passed to the function when invoked. Multiple copies of the 00513 * function are allowed. If there are multiple callbacks, they are 00514 * invoked in the order they were registered. 00515 */ 00516 void 00517 register_callback(event_callback __fn, int __index); 00518 00519 protected: 00520 streamsize _M_precision; 00521 streamsize _M_width; 00522 fmtflags _M_flags; 00523 iostate _M_exception; 00524 iostate _M_streambuf_state; 00525 00526 // 27.4.2.6 Members for callbacks 00527 // 27.4.2.6 ios_base callbacks 00528 struct _Callback_list 00529 { 00530 // Data Members 00531 _Callback_list* _M_next; 00532 ios_base::event_callback _M_fn; 00533 int _M_index; 00534 _Atomic_word _M_refcount; // 0 means one reference. 00535 00536 _Callback_list(ios_base::event_callback __fn, int __index, 00537 _Callback_list* __cb) 00538 : _M_next(__cb), _M_fn(__fn), _M_index(__index), _M_refcount(0) { } 00539 00540 void 00541 _M_add_reference() { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 00542 00543 // 0 => OK to delete. 00544 int 00545 _M_remove_reference() 00546 { 00547 // Be race-detector-friendly. For more info see bits/c++config. 00548 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); 00549 int __res = __gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1); 00550 if (__res == 0) 00551 { 00552 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); 00553 } 00554 return __res; 00555 } 00556 }; 00557 00558 _Callback_list* _M_callbacks; 00559 00560 void 00561 _M_call_callbacks(event __ev) throw(); 00562 00563 void 00564 _M_dispose_callbacks(void) throw(); 00565 00566 // 27.4.2.5 Members for iword/pword storage 00567 struct _Words 00568 { 00569 void* _M_pword; 00570 long _M_iword; 00571 _Words() : _M_pword(0), _M_iword(0) { } 00572 }; 00573 00574 // Only for failed iword/pword calls. 00575 _Words _M_word_zero; 00576 00577 // Guaranteed storage. 00578 // The first 5 iword and pword slots are reserved for internal use. 00579 enum { _S_local_word_size = 8 }; 00580 _Words _M_local_word[_S_local_word_size]; 00581 00582 // Allocated storage. 00583 int _M_word_size; 00584 _Words* _M_word; 00585 00586 _Words& 00587 _M_grow_words(int __index, bool __iword); 00588 00589 // Members for locale and locale caching. 00590 locale _M_ios_locale; 00591 00592 void 00593 _M_init() throw(); 00594 00595 public: 00596 00597 // 27.4.2.1.6 Class ios_base::Init 00598 // Used to initialize standard streams. In theory, g++ could use 00599 // -finit-priority to order this stuff correctly without going 00600 // through these machinations. 00601 class Init 00602 { 00603 friend class ios_base; 00604 public: 00605 Init(); 00606 ~Init(); 00607 00608 private: 00609 static _Atomic_word _S_refcount; 00610 static bool _S_synced_with_stdio; 00611 }; 00612 00613 // [27.4.2.2] fmtflags state functions 00614 /** 00615 * @brief Access to format flags. 00616 * @return The format control flags for both input and output. 00617 */ 00618 fmtflags 00619 flags() const 00620 { return _M_flags; } 00621 00622 /** 00623 * @brief Setting new format flags all at once. 00624 * @param __fmtfl The new flags to set. 00625 * @return The previous format control flags. 00626 * 00627 * This function overwrites all the format flags with @a __fmtfl. 00628 */ 00629 fmtflags 00630 flags(fmtflags __fmtfl) 00631 { 00632 fmtflags __old = _M_flags; 00633 _M_flags = __fmtfl; 00634 return __old; 00635 } 00636 00637 /** 00638 * @brief Setting new format flags. 00639 * @param __fmtfl Additional flags to set. 00640 * @return The previous format control flags. 00641 * 00642 * This function sets additional flags in format control. Flags that 00643 * were previously set remain set. 00644 */ 00645 fmtflags 00646 setf(fmtflags __fmtfl) 00647 { 00648 fmtflags __old = _M_flags; 00649 _M_flags |= __fmtfl; 00650 return __old; 00651 } 00652 00653 /** 00654 * @brief Setting new format flags. 00655 * @param __fmtfl Additional flags to set. 00656 * @param __mask The flags mask for @a fmtfl. 00657 * @return The previous format control flags. 00658 * 00659 * This function clears @a mask in the format flags, then sets 00660 * @a fmtfl @c & @a mask. An example mask is @c ios_base::adjustfield. 00661 */ 00662 fmtflags 00663 setf(fmtflags __fmtfl, fmtflags __mask) 00664 { 00665 fmtflags __old = _M_flags; 00666 _M_flags &= ~__mask; 00667 _M_flags |= (__fmtfl & __mask); 00668 return __old; 00669 } 00670 00671 /** 00672 * @brief Clearing format flags. 00673 * @param __mask The flags to unset. 00674 * 00675 * This function clears @a __mask in the format flags. 00676 */ 00677 void 00678 unsetf(fmtflags __mask) 00679 { _M_flags &= ~__mask; } 00680 00681 /** 00682 * @brief Flags access. 00683 * @return The precision to generate on certain output operations. 00684 * 00685 * Be careful if you try to give a definition of @a precision here; see 00686 * DR 189. 00687 */ 00688 streamsize 00689 precision() const 00690 { return _M_precision; } 00691 00692 /** 00693 * @brief Changing flags. 00694 * @param __prec The new precision value. 00695 * @return The previous value of precision(). 00696 */ 00697 streamsize 00698 precision(streamsize __prec) 00699 { 00700 streamsize __old = _M_precision; 00701 _M_precision = __prec; 00702 return __old; 00703 } 00704 00705 /** 00706 * @brief Flags access. 00707 * @return The minimum field width to generate on output operations. 00708 * 00709 * <em>Minimum field width</em> refers to the number of characters. 00710 */ 00711 streamsize 00712 width() const 00713 { return _M_width; } 00714 00715 /** 00716 * @brief Changing flags. 00717 * @param __wide The new width value. 00718 * @return The previous value of width(). 00719 */ 00720 streamsize 00721 width(streamsize __wide) 00722 { 00723 streamsize __old = _M_width; 00724 _M_width = __wide; 00725 return __old; 00726 } 00727 00728 // [27.4.2.4] ios_base static members 00729 /** 00730 * @brief Interaction with the standard C I/O objects. 00731 * @param __sync Whether to synchronize or not. 00732 * @return True if the standard streams were previously synchronized. 00733 * 00734 * The synchronization referred to is @e only that between the standard 00735 * C facilities (e.g., stdout) and the standard C++ objects (e.g., 00736 * cout). User-declared streams are unaffected. See 00737 * https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary 00738 */ 00739 static bool 00740 sync_with_stdio(bool __sync = true); 00741 00742 // [27.4.2.3] ios_base locale functions 00743 /** 00744 * @brief Setting a new locale. 00745 * @param __loc The new locale. 00746 * @return The previous locale. 00747 * 00748 * Sets the new locale for this stream, and then invokes each callback 00749 * with imbue_event. 00750 */ 00751 locale 00752 imbue(const locale& __loc) throw(); 00753 00754 /** 00755 * @brief Locale access 00756 * @return A copy of the current locale. 00757 * 00758 * If @c imbue(loc) has previously been called, then this function 00759 * returns @c loc. Otherwise, it returns a copy of @c std::locale(), 00760 * the global C++ locale. 00761 */ 00762 locale 00763 getloc() const 00764 { return _M_ios_locale; } 00765 00766 /** 00767 * @brief Locale access 00768 * @return A reference to the current locale. 00769 * 00770 * Like getloc above, but returns a reference instead of 00771 * generating a copy. 00772 */ 00773 const locale& 00774 _M_getloc() const 00775 { return _M_ios_locale; } 00776 00777 // [27.4.2.5] ios_base storage functions 00778 /** 00779 * @brief Access to unique indices. 00780 * @return An integer different from all previous calls. 00781 * 00782 * This function returns a unique integer every time it is called. It 00783 * can be used for any purpose, but is primarily intended to be a unique 00784 * index for the iword and pword functions. The expectation is that an 00785 * application calls xalloc in order to obtain an index in the iword and 00786 * pword arrays that can be used without fear of conflict. 00787 * 00788 * The implementation maintains a static variable that is incremented and 00789 * returned on each invocation. xalloc is guaranteed to return an index 00790 * that is safe to use in the iword and pword arrays. 00791 */ 00792 static int 00793 xalloc() throw(); 00794 00795 /** 00796 * @brief Access to integer array. 00797 * @param __ix Index into the array. 00798 * @return A reference to an integer associated with the index. 00799 * 00800 * The iword function provides access to an array of integers that can be 00801 * used for any purpose. The array grows as required to hold the 00802 * supplied index. All integers in the array are initialized to 0. 00803 * 00804 * The implementation reserves several indices. You should use xalloc to 00805 * obtain an index that is safe to use. Also note that since the array 00806 * can grow dynamically, it is not safe to hold onto the reference. 00807 */ 00808 long& 00809 iword(int __ix) 00810 { 00811 _Words& __word = (__ix < _M_word_size) 00812 ? _M_word[__ix] : _M_grow_words(__ix, true); 00813 return __word._M_iword; 00814 } 00815 00816 /** 00817 * @brief Access to void pointer array. 00818 * @param __ix Index into the array. 00819 * @return A reference to a void* associated with the index. 00820 * 00821 * The pword function provides access to an array of pointers that can be 00822 * used for any purpose. The array grows as required to hold the 00823 * supplied index. All pointers in the array are initialized to 0. 00824 * 00825 * The implementation reserves several indices. You should use xalloc to 00826 * obtain an index that is safe to use. Also note that since the array 00827 * can grow dynamically, it is not safe to hold onto the reference. 00828 */ 00829 void*& 00830 pword(int __ix) 00831 { 00832 _Words& __word = (__ix < _M_word_size) 00833 ? _M_word[__ix] : _M_grow_words(__ix, false); 00834 return __word._M_pword; 00835 } 00836 00837 // Destructor 00838 /** 00839 * Invokes each callback with erase_event. Destroys local storage. 00840 * 00841 * Note that the ios_base object for the standard streams never gets 00842 * destroyed. As a result, any callbacks registered with the standard 00843 * streams will not get invoked with erase_event (unless copyfmt is 00844 * used). 00845 */ 00846 virtual ~ios_base(); 00847 00848 protected: 00849 ios_base() throw (); 00850 00851 #if __cplusplus < 201103L 00852 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00853 // 50. Copy constructor and assignment operator of ios_base 00854 private: 00855 ios_base(const ios_base&); 00856 00857 ios_base& 00858 operator=(const ios_base&); 00859 #else 00860 public: 00861 ios_base(const ios_base&) = delete; 00862 00863 ios_base& 00864 operator=(const ios_base&) = delete; 00865 00866 protected: 00867 void 00868 _M_move(ios_base&) noexcept; 00869 00870 void 00871 _M_swap(ios_base& __rhs) noexcept; 00872 #endif 00873 }; 00874 00875 // [27.4.5.1] fmtflags manipulators 00876 /// Calls base.setf(ios_base::boolalpha). 00877 inline ios_base& 00878 boolalpha(ios_base& __base) 00879 { 00880 __base.setf(ios_base::boolalpha); 00881 return __base; 00882 } 00883 00884 /// Calls base.unsetf(ios_base::boolalpha). 00885 inline ios_base& 00886 noboolalpha(ios_base& __base) 00887 { 00888 __base.unsetf(ios_base::boolalpha); 00889 return __base; 00890 } 00891 00892 /// Calls base.setf(ios_base::showbase). 00893 inline ios_base& 00894 showbase(ios_base& __base) 00895 { 00896 __base.setf(ios_base::showbase); 00897 return __base; 00898 } 00899 00900 /// Calls base.unsetf(ios_base::showbase). 00901 inline ios_base& 00902 noshowbase(ios_base& __base) 00903 { 00904 __base.unsetf(ios_base::showbase); 00905 return __base; 00906 } 00907 00908 /// Calls base.setf(ios_base::showpoint). 00909 inline ios_base& 00910 showpoint(ios_base& __base) 00911 { 00912 __base.setf(ios_base::showpoint); 00913 return __base; 00914 } 00915 00916 /// Calls base.unsetf(ios_base::showpoint). 00917 inline ios_base& 00918 noshowpoint(ios_base& __base) 00919 { 00920 __base.unsetf(ios_base::showpoint); 00921 return __base; 00922 } 00923 00924 /// Calls base.setf(ios_base::showpos). 00925 inline ios_base& 00926 showpos(ios_base& __base) 00927 { 00928 __base.setf(ios_base::showpos); 00929 return __base; 00930 } 00931 00932 /// Calls base.unsetf(ios_base::showpos). 00933 inline ios_base& 00934 noshowpos(ios_base& __base) 00935 { 00936 __base.unsetf(ios_base::showpos); 00937 return __base; 00938 } 00939 00940 /// Calls base.setf(ios_base::skipws). 00941 inline ios_base& 00942 skipws(ios_base& __base) 00943 { 00944 __base.setf(ios_base::skipws); 00945 return __base; 00946 } 00947 00948 /// Calls base.unsetf(ios_base::skipws). 00949 inline ios_base& 00950 noskipws(ios_base& __base) 00951 { 00952 __base.unsetf(ios_base::skipws); 00953 return __base; 00954 } 00955 00956 /// Calls base.setf(ios_base::uppercase). 00957 inline ios_base& 00958 uppercase(ios_base& __base) 00959 { 00960 __base.setf(ios_base::uppercase); 00961 return __base; 00962 } 00963 00964 /// Calls base.unsetf(ios_base::uppercase). 00965 inline ios_base& 00966 nouppercase(ios_base& __base) 00967 { 00968 __base.unsetf(ios_base::uppercase); 00969 return __base; 00970 } 00971 00972 /// Calls base.setf(ios_base::unitbuf). 00973 inline ios_base& 00974 unitbuf(ios_base& __base) 00975 { 00976 __base.setf(ios_base::unitbuf); 00977 return __base; 00978 } 00979 00980 /// Calls base.unsetf(ios_base::unitbuf). 00981 inline ios_base& 00982 nounitbuf(ios_base& __base) 00983 { 00984 __base.unsetf(ios_base::unitbuf); 00985 return __base; 00986 } 00987 00988 // [27.4.5.2] adjustfield manipulators 00989 /// Calls base.setf(ios_base::internal, ios_base::adjustfield). 00990 inline ios_base& 00991 internal(ios_base& __base) 00992 { 00993 __base.setf(ios_base::internal, ios_base::adjustfield); 00994 return __base; 00995 } 00996 00997 /// Calls base.setf(ios_base::left, ios_base::adjustfield). 00998 inline ios_base& 00999 left(ios_base& __base) 01000 { 01001 __base.setf(ios_base::left, ios_base::adjustfield); 01002 return __base; 01003 } 01004 01005 /// Calls base.setf(ios_base::right, ios_base::adjustfield). 01006 inline ios_base& 01007 right(ios_base& __base) 01008 { 01009 __base.setf(ios_base::right, ios_base::adjustfield); 01010 return __base; 01011 } 01012 01013 // [27.4.5.3] basefield manipulators 01014 /// Calls base.setf(ios_base::dec, ios_base::basefield). 01015 inline ios_base& 01016 dec(ios_base& __base) 01017 { 01018 __base.setf(ios_base::dec, ios_base::basefield); 01019 return __base; 01020 } 01021 01022 /// Calls base.setf(ios_base::hex, ios_base::basefield). 01023 inline ios_base& 01024 hex(ios_base& __base) 01025 { 01026 __base.setf(ios_base::hex, ios_base::basefield); 01027 return __base; 01028 } 01029 01030 /// Calls base.setf(ios_base::oct, ios_base::basefield). 01031 inline ios_base& 01032 oct(ios_base& __base) 01033 { 01034 __base.setf(ios_base::oct, ios_base::basefield); 01035 return __base; 01036 } 01037 01038 // [27.4.5.4] floatfield manipulators 01039 /// Calls base.setf(ios_base::fixed, ios_base::floatfield). 01040 inline ios_base& 01041 fixed(ios_base& __base) 01042 { 01043 __base.setf(ios_base::fixed, ios_base::floatfield); 01044 return __base; 01045 } 01046 01047 /// Calls base.setf(ios_base::scientific, ios_base::floatfield). 01048 inline ios_base& 01049 scientific(ios_base& __base) 01050 { 01051 __base.setf(ios_base::scientific, ios_base::floatfield); 01052 return __base; 01053 } 01054 01055 #if __cplusplus >= 201103L 01056 // New C++11 floatfield manipulators 01057 01058 /// Calls 01059 /// base.setf(ios_base::fixed|ios_base::scientific, ios_base::floatfield) 01060 inline ios_base& 01061 hexfloat(ios_base& __base) 01062 { 01063 __base.setf(ios_base::fixed | ios_base::scientific, ios_base::floatfield); 01064 return __base; 01065 } 01066 01067 /// Calls @c base.unsetf(ios_base::floatfield) 01068 inline ios_base& 01069 defaultfloat(ios_base& __base) 01070 { 01071 __base.unsetf(ios_base::floatfield); 01072 return __base; 01073 } 01074 #endif 01075 01076 _GLIBCXX_END_NAMESPACE_VERSION 01077 } // namespace 01078 01079 #endif /* _IOS_BASE_H */