The actual work of input and output (for files).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.
More...
The actual work of input and output (for files).
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 67 of file fstream.
typedef basic_streambuf<char_type, traits_type> std::basic_filebuf< _CharT, _Traits >::__streambuf_type |
This is a non-standard type.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
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 |
This is a non-standard type.
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 |
This is a non-standard type.
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 |
This is a non-standard type.
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 |
This is a non-standard type.
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 79 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 172 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 189 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 386 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 failureIf no file is currently open, this function immediately fails.
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 128 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 458 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] |
Locale access.
If pubimbue(loc) has been called, then the most recent loc
is returned. Otherwise the global locale in effect at the time of construction is returned.
Definition at line 464 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] |
Locale access.
If pubimbue(loc) has been called, then the most recent loc
is returned. Otherwise the global locale in effect at the time of construction is returned.
Definition at line 511 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. |
This just advances the read position without returning any data.
Definition at line 474 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] |
Locale access.
If pubimbue(loc) has been called, then the most recent loc
is returned. Otherwise the global locale in effect at the time of construction is returned.
Definition at line 461 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. |
Translations done during I/O which depend on the current locale are changed by this call. The standard adds, Between invocations of this function a class derived from streambuf can safely cache results of calls to locale functions and to members of facets so obtained.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 855 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(), and std::basic_filebuf< _CharT, _Traits >::seekoff().
streamsize std::basic_streambuf< _CharT, _Traits >::in_avail | ( | ) | [inline, inherited] |
Looking ahead into the stream.
If a read position is available, returns the number of characters available for reading before the buffer must be refilled. Otherwise returns the derived showmanyc()
.
bool std::basic_filebuf< _CharT, _Traits >::is_open | ( | ) | const throw () [inline] |
Returns true if the external file is open.
Definition at line 222 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().
__filebuf_type* std::basic_filebuf< _CharT, _Traits >::open | ( | const std::string & | __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 failure Definition at line 275 of file fstream.
Referenced by std::basic_filebuf< char_type, traits_type >::open().
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 failureIf a file is already open, this function immediately fails. Otherwise it tries to open the file named s using the flags given in mode.
Table 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 94 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. |
Informally, this function is called when the output buffer is full (or does not exist, as buffering need not actually be done). If a buffer exists, it is "consumed", with "some effect" on the controlled sequence. (Typically, the buffer is written out to the sequence verbatim.) In either case, the character c is also written out, if c is not 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 408 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 356 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 505 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. |
This just advances the write position without returning any data.
Definition at line 521 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] |
Locale access.
If pubimbue(loc) has been called, then the most recent loc
is returned. Otherwise the global locale in effect at the time of construction is returned.
Definition at line 508 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.
If pubimbue(loc) has been called, then the most recent loc
is returned. Otherwise the global locale in effect at the time of construction is returned.
Definition at line 248 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.
If the input read position is available, returns that character and increments the read pointer, otherwise calls and returns uflow()
.
Definition at line 293 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 686 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::ios_base::cur, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gptr(), and std::basic_filebuf< _CharT, _Traits >::is_open().
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 739 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
If no file has been opened, and both s and n are zero, then the stream becomes unbuffered. Otherwise, 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 657 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.
If the input read position is available, returns that character, otherwise calls and returns underflow()
. Does not move the read position after fetching the character.
Definition at line 315 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.
If it returns a positive value, then successive calls to 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
eof()
but that they will return "immediately". Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 178 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, and std::basic_filebuf< _CharT, _Traits >::is_open().
int_type std::basic_streambuf< _CharT, _Traits >::snextc | ( | ) | [inline, inherited] |
Getting the next character.
Calls sbumpc()
, and if that function returns traits::eof()
, so does this function. Otherwise, sgetc()
.
Definition at line 275 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. |
Similar to sungetc(), but c is pushed onto the stream instead of "the previous character". If successful, the next character fetched from the input stream will be c.
Definition at line 348 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. |
One of two public output functions.
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 400 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.
If a putback position is available, this function decrements the input pointer and returns that character. Otherwise, calls and returns pbackfail(). The effect is to "unget" the last character "gotten".
Definition at line 373 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.
Each derived class provides its own appropriate behavior, including the definition of "failure".
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 838 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.
Informally, this function does the same thing as 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.
Informally, this function is called when the input buffer is exhausted (or does not exist, as buffering need not actually be done). If a buffer exists, it is "refilled". In either case, the next available character is returned, or 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 204 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::basic_streambuf< _CharT, _Traits >::gptr(), std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::in(), std::ios_base::in, 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. |
Fills s[0] through s[n-1] with characters from the input sequence, as if by 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 527 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< char_type, traits_type >::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. |
Writes s[0] through s[n-1] to the output sequence, as if by 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 610 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< char_type, traits_type >::xsputn().
char_type* std::basic_filebuf< _CharT, _Traits >::_M_buf [protected] |
Pointer to the beginning of internal buffer.
Definition at line 109 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 187 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 116 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 151 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 156 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 163 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 94 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 140 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 128 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().