This class associates both its input and output sequence with an external disk file, and maintains a joint file position for both sequences. Many of its semantics are described in terms of similar behavior in the Standard C Library's FILE
streams.
Definition at line 68 of file fstream.
typedef basic_streambuf<char_type, traits_type> std::basic_filebuf< _CharT, _Traits >::__streambuf_type |
typedef _CharT std::basic_filebuf< _CharT, _Traits >::char_type |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Reimplemented in __gnu_cxx::stdio_filebuf< _CharT, _Traits >.
typedef traits_type::int_type std::basic_filebuf< _CharT, _Traits >::int_type |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Reimplemented in __gnu_cxx::stdio_filebuf< _CharT, _Traits >.
typedef traits_type::off_type std::basic_filebuf< _CharT, _Traits >::off_type |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Reimplemented in __gnu_cxx::stdio_filebuf< _CharT, _Traits >.
typedef traits_type::pos_type std::basic_filebuf< _CharT, _Traits >::pos_type |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Reimplemented in __gnu_cxx::enc_filebuf< _CharT >, and __gnu_cxx::stdio_filebuf< _CharT, _Traits >.
typedef _Traits std::basic_filebuf< _CharT, _Traits >::traits_type |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Reimplemented in __gnu_cxx::enc_filebuf< _CharT >, and __gnu_cxx::stdio_filebuf< _CharT, _Traits >.
std::basic_filebuf< _CharT, _Traits >::basic_filebuf | ( | ) | [inline] |
Does not open any files.
The default constructor initializes the parent class using its own default ctor.
Definition at line 84 of file fstream.tcc.
References std::basic_streambuf< _CharT, _Traits >::_M_buf_locale.
virtual std::basic_filebuf< _CharT, _Traits >::~basic_filebuf | ( | ) | [inline, virtual] |
void std::basic_filebuf< _CharT, _Traits >::_M_create_pback | ( | ) | [inline, protected] |
Initializes pback buffers, and moves normal buffers to safety. Assumptions: _M_in_cur has already been moved back
Definition at line 173 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::pbackfail().
void std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback | ( | ) | throw () [inline, protected] |
Deactivates pback buffer contents, and restores normal buffer. Assumptions: The pback buffer has only moved forward.
Definition at line 190 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekpos(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
void std::basic_filebuf< _CharT, _Traits >::_M_set_buffer | ( | streamsize | __off | ) | [inline, protected] |
This function sets the pointers of the internal buffer, both get and put areas. Typically:
__off == egptr() - eback() upon underflow/uflow ('read' mode); __off == 0 upon overflow ('write' mode); __off == -1 upon open, setbuf, seekoff/pos ('uncommitted' mode).
NB: epptr() - pbase() == _M_buf_size - 1, since _M_buf_size reflects the actual allocated memory and the last cell is reserved for the overflow char of a full put area.
Definition at line 375 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::open(), std::basic_filebuf< _CharT, _Traits >::overflow(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), std::basic_filebuf< _CharT, _Traits >::underflow(), std::basic_filebuf< _CharT, _Traits >::xsgetn(), and std::basic_filebuf< _CharT, _Traits >::xsputn().
basic_filebuf< _CharT, _Traits >::__filebuf_type * std::basic_filebuf< _CharT, _Traits >::close | ( | ) | [inline] |
Closes the currently associated file.
this
on success, NULL on failure
If a "put buffer area" exists, overflow(eof)
is called to flush all the characters. The file is then closed.
If any operations fail, this function also fails.
Definition at line 133 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::is_open().
Referenced by std::basic_filebuf< _CharT, _Traits >::open().
char_type* std::basic_streambuf< _CharT, _Traits >::eback | ( | ) | const [inline, protected, inherited] |
Access to the get area.
These functions are only available to other protected functions, including derived classes.
Definition at line 463 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
char_type* std::basic_streambuf< _CharT, _Traits >::egptr | ( | ) | const [inline, protected, inherited] |
Access to the get area.
These functions are only available to other protected functions, including derived classes.
Definition at line 469 of file streambuf.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
char_type* std::basic_streambuf< _CharT, _Traits >::epptr | ( | ) | const [inline, protected, inherited] |
Access to the put area.
These functions are only available to other protected functions, including derived classes.
Definition at line 516 of file streambuf.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_streambuf< _CharT, _Traits >::xsputn(), and std::basic_filebuf< _CharT, _Traits >::xsputn().
void std::basic_streambuf< _CharT, _Traits >::gbump | ( | int | __n | ) | [inline, protected, inherited] |
Moving the read position.
n | The delta by which to move. |
Definition at line 479 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
locale std::basic_streambuf< _CharT, _Traits >::getloc | ( | ) | const [inline, inherited] |
char_type* std::basic_streambuf< _CharT, _Traits >::gptr | ( | ) | const [inline, protected, inherited] |
Access to the get area.
These functions are only available to other protected functions, including derived classes.
Definition at line 466 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
void std::basic_filebuf< _CharT, _Traits >::imbue | ( | const locale & | ) | [inline, protected, virtual] |
Changes translations.
loc | A new locale. |
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 858 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_ext_buf, std::basic_filebuf< _CharT, _Traits >::_M_ext_next, std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), std::ios_base::cur, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::basic_filebuf< _CharT, _Traits >::is_open(), std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::length(), and std::basic_filebuf< _CharT, _Traits >::seekoff().
streamsize std::basic_streambuf< _CharT, _Traits >::in_avail | ( | ) | [inline, inherited] |
Looking ahead into the stream.
showmanyc()
.
bool std::basic_filebuf< _CharT, _Traits >::is_open | ( | ) | const throw () [inline] |
Returns true if the external file is open.
Definition at line 223 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::close(), std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::open(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekpos(), std::basic_filebuf< _CharT, _Traits >::setbuf(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), and __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf().
basic_filebuf< _CharT, _Traits >::__filebuf_type * std::basic_filebuf< _CharT, _Traits >::open | ( | const char * | __s, | |
ios_base::openmode | __mode | |||
) | [inline] |
Opens an external file.
s | The name of the file. | |
mode | The open mode flags. |
this
on success, NULL on failureTable 92, adapted here, gives the relation between openmode combinations and the equivalent fopen() flags. (NB: lines app, in|out|app, in|app, binary|app, binary|in|out|app, and binary|in|app per DR 596) +---------------------------------------------------------+ | ios_base Flag combination stdio equivalent | |binary in out trunc app | +---------------------------------------------------------+ | + "w" | | + + "a" | | + "a" | | + + "w" | | + "r" | | + + "r+" | | + + + "w+" | | + + + "a+" | | + + "a+" | +---------------------------------------------------------+ | + + "wb" | | + + + "ab" | | + + "ab" | | + + + "wb" | | + + "rb" | | + + + "r+b" | | + + + + "w+b" | | + + + + "a+b" | | + + + "a+b" | +---------------------------------------------------------+
Definition at line 99 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), std::ios_base::ate, std::basic_filebuf< _CharT, _Traits >::close(), std::ios_base::end, std::basic_filebuf< _CharT, _Traits >::is_open(), and std::basic_filebuf< _CharT, _Traits >::seekoff().
basic_filebuf< _CharT, _Traits >::int_type std::basic_filebuf< _CharT, _Traits >::overflow | ( | int_type | = _Traits::eof() |
) | [inline, protected, virtual] |
Consumes data from the buffer; writes to the controlled sequence.
c | An additional character to consume. |
eof()
.For a formal definition of this function, see a good text such as Langer & Kreft, or [27.5.2.4.5]/3-7.
A functioning output streambuf can be created by overriding only this function (no buffer area will be used).
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 413 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), std::ios_base::out, std::basic_streambuf< _CharT, _Traits >::pbase(), std::basic_streambuf< _CharT, _Traits >::pbump(), and std::basic_streambuf< _CharT, _Traits >::pptr().
Referenced by std::basic_filebuf< _CharT, _Traits >::sync().
basic_filebuf< _CharT, _Traits >::int_type std::basic_filebuf< _CharT, _Traits >::pbackfail | ( | int_type | = _Traits::eof() |
) | [inline, protected, virtual] |
Tries to back up the input sequence.
c | The character to be inserted back into the sequence. |
gptr()
, eback()
, and pptr()
are the same as for underflow()
.Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 361 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_create_pback(), std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_pback_init, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::ios_base::cur, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::gbump(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::ios_base::in, std::basic_filebuf< _CharT, _Traits >::seekoff(), and std::basic_filebuf< _CharT, _Traits >::underflow().
char_type* std::basic_streambuf< _CharT, _Traits >::pbase | ( | ) | const [inline, protected, inherited] |
Access to the put area.
These functions are only available to other protected functions, including derived classes.
Definition at line 510 of file streambuf.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::sync(), and std::basic_filebuf< _CharT, _Traits >::xsputn().
void std::basic_streambuf< _CharT, _Traits >::pbump | ( | int | __n | ) | [inline, protected, inherited] |
Moving the write position.
n | The delta by which to move. |
Definition at line 526 of file streambuf.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), and std::basic_streambuf< _CharT, _Traits >::xsputn().
char_type* std::basic_streambuf< _CharT, _Traits >::pptr | ( | ) | const [inline, protected, inherited] |
Access to the put area.
These functions are only available to other protected functions, including derived classes.
Definition at line 513 of file streambuf.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::sync(), std::basic_streambuf< _CharT, _Traits >::xsputn(), and std::basic_filebuf< _CharT, _Traits >::xsputn().
locale std::basic_streambuf< _CharT, _Traits >::pubimbue | ( | const locale & | __loc | ) | [inline, inherited] |
pos_type std::basic_streambuf< _CharT, _Traits >::pubseekoff | ( | off_type | __off, | |
ios_base::seekdir | __way, | |||
ios_base::openmode | __mode = ios_base::in | ios_base::out | |||
) | [inline, inherited] |
pos_type std::basic_streambuf< _CharT, _Traits >::pubseekpos | ( | pos_type | __sp, | |
ios_base::openmode | __mode = ios_base::in | ios_base::out | |||
) | [inline, inherited] |
__streambuf_type* std::basic_streambuf< _CharT, _Traits >::pubsetbuf | ( | char_type * | __s, | |
streamsize | __n | |||
) | [inline, inherited] |
int std::basic_streambuf< _CharT, _Traits >::pubsync | ( | ) | [inline, inherited] |
Locale access.
loc
is returned. Otherwise the global locale in effect at the time of construction is returned.
Definition at line 253 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::sync().
int_type std::basic_streambuf< _CharT, _Traits >::sbumpc | ( | ) | [inline, inherited] |
Getting the next character.
uflow()
.
Definition at line 298 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), and std::istreambuf_iterator< _CharT, _Traits >::operator++().
basic_filebuf< _CharT, _Traits >::pos_type std::basic_filebuf< _CharT, _Traits >::seekoff | ( | off_type | , | |
ios_base::seekdir | , | |||
ios_base::openmode | = ios_base::in | ios_base::out | |||
) | [inline, protected, virtual] |
Alters the stream positions.
Each derived class provides its own appropriate behavior.
pos_type
that represents an invalid stream position. Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 689 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback(), std::basic_filebuf< _CharT, _Traits >::_M_ext_buf, std::basic_filebuf< _CharT, _Traits >::_M_ext_next, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::always_noconv(), std::ios_base::cur, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::encoding(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::basic_filebuf< _CharT, _Traits >::is_open(), and std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::length().
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::open(), and std::basic_filebuf< _CharT, _Traits >::pbackfail().
basic_filebuf< _CharT, _Traits >::pos_type std::basic_filebuf< _CharT, _Traits >::seekpos | ( | pos_type | , | |
ios_base::openmode | = ios_base::in | ios_base::out | |||
) | [inline, protected, virtual] |
Alters the stream positions.
Each derived class provides its own appropriate behavior.
pos_type
that represents an invalid stream position. Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 742 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback(), std::ios_base::beg, and std::basic_filebuf< _CharT, _Traits >::is_open().
basic_filebuf< _CharT, _Traits >::__streambuf_type * std::basic_filebuf< _CharT, _Traits >::setbuf | ( | char_type * | __s, | |
streamsize | __n | |||
) | [inline, protected, virtual] |
Manipulates the buffer.
s | Pointer to a buffer area. | |
n | Size of s. |
this
s
is used as a buffer; see http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25s02.html for more.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 662 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_buf, std::basic_filebuf< _CharT, _Traits >::_M_buf_size, and std::basic_filebuf< _CharT, _Traits >::is_open().
void std::basic_streambuf< _CharT, _Traits >::setg | ( | char_type * | __gbeg, | |
char_type * | __gnext, | |||
char_type * | __gend | |||
) | [inline, protected, inherited] |
void std::basic_streambuf< _CharT, _Traits >::setp | ( | char_type * | __pbeg, | |
char_type * | __pend | |||
) | [inline, protected, inherited] |
int_type std::basic_streambuf< _CharT, _Traits >::sgetc | ( | ) | [inline, inherited] |
Getting the next character.
underflow()
. Does not move the read position after fetching the character.
Definition at line 320 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().
streamsize std::basic_streambuf< _CharT, _Traits >::sgetn | ( | char_type * | __s, | |
streamsize | __n | |||
) | [inline, inherited] |
streamsize std::basic_filebuf< _CharT, _Traits >::showmanyc | ( | ) | [inline, protected, virtual] |
Investigating the data available.
underflow()
will not return traits::eof()
until at least that number of characters have been supplied. If showmanyc()
returns -1, then calls to underflow()
or uflow()
will fail." [27.5.2.4.3]/1
The standard adds that "the intention is not only that the calls [to underflow or uflow] will not return eof()
but that they will return "immediately".
The standard adds that "the morphemes of showmanyc
are "es-how-many-see", not "show-manic".
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 183 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_mode, std::ios_base::binary, std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::ios_base::in, std::basic_filebuf< _CharT, _Traits >::is_open(), and std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::max_length().
int_type std::basic_streambuf< _CharT, _Traits >::snextc | ( | ) | [inline, inherited] |
Getting the next character.
sbumpc()
, and if that function returns traits::eof()
, so does this function. Otherwise, sgetc()
.
Definition at line 280 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().
int_type std::basic_streambuf< _CharT, _Traits >::sputbackc | ( | char_type | __c | ) | [inline, inherited] |
Pushing characters back into the input stream.
c | The character to push back. |
Definition at line 353 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::putback().
int_type std::basic_streambuf< _CharT, _Traits >::sputc | ( | char_type | __c | ) | [inline, inherited] |
Entry point for all single-character output functions.
c | A character to output. |
If a write position is available for the output sequence (i.e., the buffer is not full), stores c in that position, increments the position, and returns traits::to_int_type(c)
. If a write position is not available, returns overflow(c)
.
Definition at line 405 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::get(), and std::ostreambuf_iterator< _CharT, _Traits >::operator=().
streamsize std::basic_streambuf< _CharT, _Traits >::sputn | ( | const char_type * | __s, | |
streamsize | __n | |||
) | [inline, inherited] |
void std::basic_streambuf< _CharT, _Traits >::stossc | ( | ) | [inline, inherited] |
Tosses a character.
Advances the read pointer, ignoring the character that would have been read.
int_type std::basic_streambuf< _CharT, _Traits >::sungetc | ( | ) | [inline, inherited] |
Moving backwards in the input stream.
Definition at line 378 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::unget().
int std::basic_filebuf< _CharT, _Traits >::sync | ( | ) | [inline, protected, virtual] |
Synchronizes the buffer arrays with the controlled sequences.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 841 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_streambuf< _CharT, _Traits >::pbase(), and std::basic_streambuf< _CharT, _Traits >::pptr().
virtual int_type std::basic_streambuf< _CharT, _Traits >::uflow | ( | ) | [inline, protected, virtual, inherited] |
Fetches more data from the controlled sequence.
underflow()
, and in fact is required to call that function. It also returns the new character, like underflow()
does. However, this function also moves the read position forward by one.
Reimplemented in __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >.
basic_filebuf< _CharT, _Traits >::int_type std::basic_filebuf< _CharT, _Traits >::underflow | ( | ) | [inline, protected, virtual] |
Fetches more data from the controlled sequence.
traits::eof()
to indicate a null pending sequence.For a formal definition of the pending sequence, see a good text such as Langer & Kreft, or [27.5.2.4.3]/7-14.
A functioning input streambuf can be created by overriding only this function (no buffer area will be used). For an example, see http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25.html
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 209 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback(), std::basic_filebuf< _CharT, _Traits >::_M_ext_buf, std::basic_filebuf< _CharT, _Traits >::_M_ext_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_ext_next, std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::encoding(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::in(), std::ios_base::in, std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::max_length(), and std::min().
Referenced by std::basic_filebuf< _CharT, _Traits >::pbackfail().
streamsize std::basic_filebuf< _CharT, _Traits >::xsgetn | ( | char_type * | __s, | |
streamsize | __n | |||
) | [inline, protected, virtual] |
Multiple character extraction.
s | A buffer area. | |
n | Maximum number of characters to assign. |
sbumpc()
. Stops when either n characters have been copied, or when traits::eof()
would be copied.It is expected that derived classes provide a more efficient implementation by overriding this definition.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 532 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback(), std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_pback_init, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gbump(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::ios_base::in, and std::basic_streambuf< _CharT, _Traits >::xsgetn().
streamsize std::basic_filebuf< _CharT, _Traits >::xsputn | ( | const char_type * | __s, | |
streamsize | __n | |||
) | [inline, protected, virtual] |
Multiple character insertion.
s | A buffer area. | |
n | Maximum number of characters to write. |
sputc()
. Stops when either n characters have been copied, or when sputc()
would return traits::eof()
.It is expected that derived classes provide a more efficient implementation by overriding this definition.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 615 of file fstream.tcc.
References std::basic_filebuf< _CharT, _Traits >::_M_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), std::basic_streambuf< _CharT, _Traits >::epptr(), std::min(), std::ios_base::out, std::basic_streambuf< _CharT, _Traits >::pbase(), std::basic_streambuf< _CharT, _Traits >::pptr(), and std::basic_streambuf< _CharT, _Traits >::xsputn().
char_type* std::basic_filebuf< _CharT, _Traits >::_M_buf [protected] |
Pointer to the beginning of internal buffer.
Definition at line 110 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::setbuf().
locale std::basic_streambuf< _CharT, _Traits >::_M_buf_locale [protected, inherited] |
Current locale setting.
Definition at line 192 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::basic_filebuf().
size_t std::basic_filebuf< _CharT, _Traits >::_M_buf_size [protected] |
Actual size of internal buffer. This number is equal to the size of the put area + 1 position, reserved for the overflow char of a full area.
Definition at line 117 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_filebuf< _CharT, _Traits >::setbuf(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), std::basic_filebuf< _CharT, _Traits >::underflow(), std::basic_filebuf< _CharT, _Traits >::xsgetn(), and std::basic_filebuf< _CharT, _Traits >::xsputn().
char* std::basic_filebuf< _CharT, _Traits >::_M_ext_buf [protected] |
Buffer for external characters. Used for input when codecvt::always_noconv() == false. When valid, this corresponds to eback().
Definition at line 152 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::seekoff(), and std::basic_filebuf< _CharT, _Traits >::underflow().
streamsize std::basic_filebuf< _CharT, _Traits >::_M_ext_buf_size [protected] |
Size of buffer held by _M_ext_buf.
Definition at line 157 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::underflow().
const char* std::basic_filebuf< _CharT, _Traits >::_M_ext_next [protected] |
Pointers into the buffer held by _M_ext_buf that delimit a subsequence of bytes that have been read but not yet converted. When valid, _M_ext_next corresponds to egptr().
Definition at line 164 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::seekoff(), and std::basic_filebuf< _CharT, _Traits >::underflow().
char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_beg [protected, inherited] |
char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_cur [protected, inherited] |
char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_end [protected, inherited] |
ios_base::openmode std::basic_filebuf< _CharT, _Traits >::_M_mode [protected] |
Place to stash in || out || in | out settings for current filebuf.
Definition at line 95 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::open(), std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), std::basic_filebuf< _CharT, _Traits >::underflow(), std::basic_filebuf< _CharT, _Traits >::xsgetn(), and std::basic_filebuf< _CharT, _Traits >::xsputn().
char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_beg [protected, inherited] |
char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_cur [protected, inherited] |
char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_end [protected, inherited] |
char_type std::basic_filebuf< _CharT, _Traits >::_M_pback [protected] |
char_type* std::basic_filebuf< _CharT, _Traits >::_M_pback_cur_save [protected] |
char_type* std::basic_filebuf< _CharT, _Traits >::_M_pback_end_save [protected] |
bool std::basic_filebuf< _CharT, _Traits >::_M_pback_init [protected] |
Necessary bits for putback buffer management.
Definition at line 141 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::pbackfail(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
bool std::basic_filebuf< _CharT, _Traits >::_M_reading [protected] |
_M_reading == false && _M_writing == false for 'uncommitted' mode; _M_reading == true for 'read' mode; _M_writing == true for 'write' mode;
NB: _M_reading == true && _M_writing == true is unused.
Definition at line 129 of file fstream.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::open(), std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_filebuf< _CharT, _Traits >::seekoff(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), std::basic_filebuf< _CharT, _Traits >::underflow(), std::basic_filebuf< _CharT, _Traits >::xsgetn(), and std::basic_filebuf< _CharT, _Traits >::xsputn().