Provided by: libstdc++6-4.6-doc_4.6.4-6ubuntu2_all 
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >(3cxx) __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >(3cxx)
NAME
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits > -
SYNOPSIS
Inherits std::basic_streambuf< _CharT, _Traits >.
Public Types
typedef _CharT char_type
typedef traits_type::int_type int_type
typedef traits_type::off_type off_type
typedef traits_type::pos_type pos_type
typedef _Traits traits_type
typedef basic_streambuf
< char_type, traits_type > __streambuf_type"
Public Member Functions
stdio_sync_filebuf (std::__c_file *__f)
std::__c_file *const file ()
locale getloc () const
streamsize in_avail ()
locale pubimbue (const locale &__loc)
int_type sbumpc ()
int_type sgetc ()
streamsize sgetn (char_type *__s, streamsize __n)
int_type snextc ()
int_type sputbackc (char_type __c)
int_type sputc (char_type __c)
streamsize sputn (const char_type *__s, streamsize __n)
int_type sungetc ()
__streambuf_type * pubsetbuf (char_type *__s, streamsize __n)
pos_type pubseekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode
__mode=ios_base::in|ios_base::out)
pos_type pubseekpos (pos_type __sp, ios_base::openmode __mode=ios_base::in|ios_base::out)
int pubsync ()
Protected Member Functions
void __safe_gbump (streamsize __n)
void __safe_pbump (streamsize __n)
void gbump (int __n)
virtual void imbue (const locale &)
virtual int_type overflow (int_type __c=traits_type::eof())
virtual int_type pbackfail (int_type __c=traits_type::eof())
void pbump (int __n)
virtual std::streampos seekoff (std::streamoff __off, std::ios_base::seekdir __dir,
std::ios_base::openmode=std::ios_base::in|std::ios_base::out)
virtual pos_type seekoff (off_type, ios_base::seekdir, ios_base::openmode=ios_base::in|ios_base::out)
virtual std::streampos seekpos (std::streampos __pos, std::ios_base::openmode
__mode=std::ios_base::in|std::ios_base::out)
virtual pos_type seekpos (pos_type, ios_base::openmode=ios_base::in|ios_base::out)
virtual basic_streambuf
< char_type, _Traits > * setbuf (char_type *, streamsize)"
void setg (char_type *__gbeg, char_type *__gnext, char_type *__gend)
void setp (char_type *__pbeg, char_type *__pend)
virtual streamsize showmanyc ()
virtual int sync ()
int_type syncgetc ()
template<> stdio_sync_filebuf< char >
::int_type syncgetc ()"
template<> stdio_sync_filebuf< wchar_t >
::int_type syncgetc ()"
int_type syncputc (int_type __c)
template<> stdio_sync_filebuf< char >
::int_type syncputc (int_type __c)"
template<> stdio_sync_filebuf< wchar_t >
::int_type syncputc (int_type __c)"
int_type syncungetc (int_type __c)
template<> stdio_sync_filebuf< char >
::int_type syncungetc (int_type __c)"
template<> stdio_sync_filebuf< wchar_t >
::int_type syncungetc (int_type __c)"
virtual int_type uflow ()
virtual int_type underflow ()
virtual std::streamsize xsgetn (char_type *__s, std::streamsize __n)
template<> std::streamsize xsgetn (char *__s, std::streamsize __n)
template<> std::streamsize xsgetn (wchar_t *__s, std::streamsize __n)
virtual streamsize xsgetn (char_type *__s, streamsize __n)
virtual std::streamsize xsputn (const char_type *__s, std::streamsize __n)
template<> std::streamsize xsputn (const char *__s, std::streamsize __n)
template<> std::streamsize xsputn (const wchar_t *__s, std::streamsize __n)
virtual streamsize xsputn (const char_type *__s, streamsize __n)
char_type * eback () const
char_type * gptr () const
char_type * egptr () const
char_type * pbase () const
char_type * pptr () const
char_type * epptr () const
Protected Attributes
locale _M_buf_locale
char_type * _M_in_beg
char_type * _M_in_cur
char_type * _M_in_end
char_type * _M_out_beg
char_type * _M_out_cur
char_type * _M_out_end
Detailed Description
template<typename _CharT, typename _Traits = std::char_traits<_CharT>>class __gnu_cxx::stdio_sync_filebuf<
_CharT, _Traits >
Provides a layer of compatibility for C.
This GNU extension provides extensions for working with standard C FILE*'s. It must be instantiated by
the user with the type of character used in the file stream, e.g., stdio_filebuf<char>.
Definition at line 57 of file stdio_sync_filebuf.h.
Member Typedef Documentation
template<typename _CharT, typename _Traits = char_traits<_CharT>> typedef basic_streambuf<char_type,
traits_type> std::basic_streambuf< _CharT, _Traits >::__streambuf_type [inherited]
This is a non-standard type.
Definition at line 135 of file streambuf.
Member Function Documentation
template<typename _CharT, typename _Traits = char_traits<_CharT>> 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.
• eback() returns the beginning pointer for the input sequence
• gptr() returns the next pointer for the input sequence
• egptr() returns the end pointer for the input sequence
Definition at line 461 of file streambuf.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_destroy_pback(), std::basic_streambuf<
char, char_traits< char > >::sputbackc(), and std::basic_streambuf< char, char_traits< char >
>::sungetc().
template<typename _CharT, typename _Traits = char_traits<_CharT>> 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.
• eback() returns the beginning pointer for the input sequence
• gptr() returns the next pointer for the input sequence
• egptr() returns the end pointer for the input sequence
Definition at line 467 of file streambuf.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_create_pback(), std::basic_streambuf<
char, char_traits< char > >::in_avail(), std::basic_streambuf< char, char_traits< char > >::sbumpc(),
std::basic_streambuf< char, char_traits< char > >::sgetc(), std::basic_stringbuf< _CharT, _Traits, _Alloc
>::showmanyc(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::str().
template<typename _CharT, typename _Traits = char_traits<_CharT>> 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.
• pbase() returns the beginning pointer for the output sequence
• pptr() returns the next pointer for the output sequence
• epptr() returns the end pointer for the output sequence
Definition at line 514 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::sputc().
template<typename _CharT , typename _Traits = std::char_traits<_CharT>> std::__c_file* const
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::file () [inline]
Returns:
The underlying FILE*.
This function can be used to access the underlying C file pointer. Note that there is no way for the
library to track what you do with the file, so be careful.
Definition at line 89 of file stdio_sync_filebuf.h.
template<typename _CharT, typename _Traits = char_traits<_CharT>> void std::basic_streambuf< _CharT, _Traits
>::gbump (int__n) [inline], [protected], [inherited]
Moving the read position.
Parameters:
n The delta by which to move.
This just advances the read position without returning any data.
Definition at line 477 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::sbumpc(), std::basic_streambuf< char,
char_traits< char > >::sputbackc(), std::basic_streambuf< char, char_traits< char > >::sungetc(), and
std::basic_streambuf< char, char_traits< char > >::uflow().
template<typename _CharT, typename _Traits = char_traits<_CharT>> locale std::basic_streambuf< _CharT,
_Traits >::getloc () const [inline], [inherited]
Locale access.
Returns:
The current locale in effect.
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 223 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::pubimbue().
template<typename _CharT, typename _Traits = char_traits<_CharT>> 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.
• eback() returns the beginning pointer for the input sequence
• gptr() returns the next pointer for the input sequence
• egptr() returns the end pointer for the input sequence
Definition at line 464 of file streambuf.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_create_pback(), std::basic_filebuf<
char_type, traits_type >::_M_destroy_pback(), std::basic_streambuf< char, char_traits< char >
>::in_avail(), std::basic_streambuf< char, char_traits< char > >::sbumpc(), std::basic_streambuf< char,
char_traits< char > >::sgetc(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::showmanyc(),
std::basic_streambuf< char, char_traits< char > >::sputbackc(), std::basic_streambuf< char, char_traits<
char > >::sungetc(), and std::basic_streambuf< char, char_traits< char > >::uflow().
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual void std::basic_streambuf< _CharT,
_Traits >::imbue (const locale &) [inline], [protected], [virtual], [inherited]
Changes translations.
Parameters:
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.
Note:
Base class version does nothing.
Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits<
_CharT > >, and std::basic_filebuf< char_type, traits_type >.
Definition at line 555 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::pubimbue().
template<typename _CharT, typename _Traits = char_traits<_CharT>> streamsize std::basic_streambuf< _CharT,
_Traits >::in_avail () [inline], [inherited]
Looking ahead into the stream.
Returns:
The number of characters available.
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().
Definition at line 263 of file streambuf.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>> virtual int_type
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::overflow (int_type = traits_type::eof()) [inline],
[protected], [virtual]
Consumes data from the buffer; writes to the controlled sequence.
Parameters:
c An additional character to consume.
Returns:
eof() to indicate failure, something else (usually c, or not_eof())
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).
Note:
Base class version does nothing, returns eof().
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 142 of file stdio_sync_filebuf.h.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>> virtual int_type
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::pbackfail (int_type = traits_type::eof()) [inline],
[protected], [virtual]
Tries to back up the input sequence.
Parameters:
c The character to be inserted back into the sequence.
Returns:
eof() on failure, some other value on success
Postcondition:
The constraints of gptr(), eback(), and pptr() are the same as for underflow().
Note:
Base class version does nothing, returns eof().
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 117 of file stdio_sync_filebuf.h.
template<typename _CharT, typename _Traits = char_traits<_CharT>> 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.
• pbase() returns the beginning pointer for the output sequence
• pptr() returns the next pointer for the output sequence
• epptr() returns the end pointer for the output sequence
Definition at line 508 of file streambuf.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::str().
template<typename _CharT, typename _Traits = char_traits<_CharT>> void std::basic_streambuf< _CharT, _Traits
>::pbump (int__n) [inline], [protected], [inherited]
Moving the write position.
Parameters:
n The delta by which to move.
This just advances the write position without returning any data.
Definition at line 524 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::sputc().
template<typename _CharT, typename _Traits = char_traits<_CharT>> 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.
• pbase() returns the beginning pointer for the output sequence
• pptr() returns the next pointer for the output sequence
• epptr() returns the end pointer for the output sequence
Definition at line 511 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::sputc(), and std::basic_stringbuf<
_CharT, _Traits, _Alloc >::str().
template<typename _CharT, typename _Traits = char_traits<_CharT>> locale std::basic_streambuf< _CharT,
_Traits >::pubimbue (const locale &__loc) [inline], [inherited]
Entry point for imbue().
Parameters:
loc The new locale.
Returns:
The previous locale.
Calls the derived imbue(loc).
Definition at line 206 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> 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]
Entry points for derived buffer functions. The public versions of pubfoo dispatch to the protected
derived foo member functions, passing the arguments (if any) and returning the result unchanged.
Definition at line 240 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> pos_type std::basic_streambuf< _CharT,
_Traits >::pubseekpos (pos_type__sp, ios_base::openmode__mode = ios_base::in | ios_base::out) [inline],
[inherited]
Entry points for derived buffer functions. The public versions of pubfoo dispatch to the protected
derived foo member functions, passing the arguments (if any) and returning the result unchanged.
Definition at line 245 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> __streambuf_type* std::basic_streambuf<
_CharT, _Traits >::pubsetbuf (char_type *__s, streamsize__n) [inline], [inherited]
Entry points for derived buffer functions. The public versions of pubfoo dispatch to the protected
derived foo member functions, passing the arguments (if any) and returning the result unchanged.
Definition at line 236 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> int std::basic_streambuf< _CharT, _Traits
>::pubsync () [inline], [inherited]
Entry points for derived buffer functions. The public versions of pubfoo dispatch to the protected
derived foo member functions, passing the arguments (if any) and returning the result unchanged.
Definition at line 250 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::sync().
template<typename _CharT, typename _Traits = char_traits<_CharT>> int_type std::basic_streambuf< _CharT,
_Traits >::sbumpc () [inline], [inherited]
Getting the next character.
Returns:
The next character, or eof.
If the input read position is available, returns that character and increments the read pointer,
otherwise calls and returns uflow().
Definition at line 295 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits
>::ignore(), std::istreambuf_iterator< _CharT, _Traits >::operator++(), and std::basic_streambuf< char,
char_traits< char > >::snextc().
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual pos_type std::basic_streambuf<
_CharT, _Traits >::seekoff (off_type, ios_base::seekdir, ios_base::openmode = ios_base::in |
ios_base::out) [inline], [protected], [virtual], [inherited]
Alters the stream positions. Each derived class provides its own appropriate behavior.
Note:
Base class version does nothing, returns a pos_type that represents an invalid stream position.
Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits<
_CharT > >, std::basic_filebuf< char_type, traits_type >, and std::basic_stringbuf< _CharT, _Traits,
_Alloc >.
Definition at line 581 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::pubseekoff().
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual pos_type std::basic_streambuf<
_CharT, _Traits >::seekpos (pos_type, ios_base::openmode = ios_base::in | ios_base::out) [inline],
[protected], [virtual], [inherited]
Alters the stream positions. Each derived class provides its own appropriate behavior.
Note:
Base class version does nothing, returns a pos_type that represents an invalid stream position.
Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits<
_CharT > >, std::basic_filebuf< char_type, traits_type >, and std::basic_stringbuf< _CharT, _Traits,
_Alloc >.
Definition at line 593 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::pubseekpos().
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual basic_streambuf<char_type,_Traits>*
std::basic_streambuf< _CharT, _Traits >::setbuf (char_type *, streamsize) [inline], [protected],
[virtual], [inherited]
Manipulates the buffer. Each derived class provides its own appropriate behavior. See the next-to-last
paragraph of http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25s02.html for more on this
function.
Note:
Base class version does nothing, returns this.
Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits<
_CharT > >, std::basic_filebuf< char_type, traits_type >, and std::basic_stringbuf< _CharT, _Traits,
_Alloc >.
Definition at line 570 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::pubsetbuf().
template<typename _CharT, typename _Traits = char_traits<_CharT>> void std::basic_streambuf< _CharT, _Traits
>::setg (char_type *__gbeg, char_type *__gnext, char_type *__gend) [inline], [protected], [inherited]
Setting the three read area pointers.
Parameters:
gbeg A pointer.
gnext A pointer.
gend A pointer.
Postcondition:
gbeg == eback(), gnext == gptr(), and gend == egptr()
Definition at line 488 of file streambuf.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_create_pback(), std::basic_filebuf<
char_type, traits_type >::_M_destroy_pback(), and std::basic_filebuf< char_type, traits_type
>::_M_set_buffer().
template<typename _CharT, typename _Traits = char_traits<_CharT>> void std::basic_streambuf< _CharT, _Traits
>::setp (char_type *__pbeg, char_type *__pend) [inline], [protected], [inherited]
Setting the three write area pointers.
Parameters:
pbeg A pointer.
pend A pointer.
Postcondition:
pbeg == pbase(), pbeg == pptr(), and pend == epptr()
Definition at line 534 of file streambuf.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_set_buffer().
template<typename _CharT, typename _Traits = char_traits<_CharT>> int_type std::basic_streambuf< _CharT,
_Traits >::sgetc () [inline], [inherited]
Getting the next character.
Returns:
The next character, or eof.
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 317 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits
>::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_istream< _CharT, _Traits
>::sentry::sentry(), and std::basic_streambuf< char, char_traits< char > >::snextc().
template<typename _CharT, typename _Traits = char_traits<_CharT>> streamsize std::basic_streambuf< _CharT,
_Traits >::sgetn (char_type *__s, streamsize__n) [inline], [inherited]
Entry point for xsgetn.
Parameters:
s A buffer area.
n A count.
Returns xsgetn(s,n). The effect is to fill s[0] through s[n-1] with characters from the input sequence,
if possible.
Definition at line 336 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual streamsize std::basic_streambuf<
_CharT, _Traits >::showmanyc () [inline], [protected], [virtual], [inherited]
Investigating the data available.
Returns:
An estimate of the number of characters available in the input sequence, or -1.
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
Note:
Base class version does nothing, returns zero.
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 in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits<
_CharT > >, std::basic_filebuf< char_type, traits_type >, and std::basic_stringbuf< _CharT, _Traits,
_Alloc >.
Definition at line 628 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::in_avail().
template<typename _CharT, typename _Traits = char_traits<_CharT>> int_type std::basic_streambuf< _CharT,
_Traits >::snextc () [inline], [inherited]
Getting the next character.
Returns:
The next character, or eof.
Calls sbumpc(), and if that function returns traits::eof(), so does this function. Otherwise, sgetc().
Definition at line 277 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().
template<typename _CharT, typename _Traits = char_traits<_CharT>> int_type std::basic_streambuf< _CharT,
_Traits >::sputbackc (char_type__c) [inline], [inherited]
Pushing characters back into the input stream.
Parameters:
c The character to push back.
Returns:
The previous character, if possible.
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 351 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::putback().
template<typename _CharT, typename _Traits = char_traits<_CharT>> int_type std::basic_streambuf< _CharT,
_Traits >::sputc (char_type__c) [inline], [inherited]
Entry point for all single-character output functions.
Parameters:
c A character to output.
Returns:
c, if possible.
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 403 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::get(), and std::ostreambuf_iterator< _CharT, _Traits
>::operator=().
template<typename _CharT, typename _Traits = char_traits<_CharT>> streamsize std::basic_streambuf< _CharT,
_Traits >::sputn (const char_type *__s, streamsize__n) [inline], [inherited]
Entry point for all single-character output functions.
Parameters:
s A buffer read area.
n A count.
One of two public output functions.
Returns xsputn(s,n). The effect is to write s[0] through s[n-1] to the output sequence, if possible.
Definition at line 429 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> int_type std::basic_streambuf< _CharT,
_Traits >::sungetc () [inline], [inherited]
Moving backwards in the input stream.
Returns:
The previous character, if possible.
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 376 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::unget().
template<typename _CharT , typename _Traits = std::char_traits<_CharT>> virtual int
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::sync (void) [inline], [protected], [virtual]
Synchronizes the buffer arrays with the controlled sequences.
Returns:
-1 on failure.
Each derived class provides its own appropriate behavior, including the definition of failure.
Note:
Base class version does nothing, returns zero.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 161 of file stdio_sync_filebuf.h.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>> virtual int_type
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::uflow () [inline], [protected], [virtual]
Fetches more data from the controlled sequence.
Returns:
The first character from the pending 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 from std::basic_streambuf< _CharT, _Traits >.
Definition at line 109 of file stdio_sync_filebuf.h.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>> virtual int_type
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::underflow () [inline], [protected], [virtual]
Fetches more data from the controlled sequence.
Returns:
The first character from the pending 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
Note:
Base class version does nothing, returns eof().
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 102 of file stdio_sync_filebuf.h.
template<typename _CharT , typename _Traits > streamsize std::basic_streambuf< _CharT, _Traits >::xsgetn
(char_type *__s, streamsize__n) [protected], [virtual], [inherited]
Multiple character extraction.
Parameters:
s A buffer area.
n Maximum number of characters to assign.
Returns:
The number of characters assigned.
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 in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits<
_CharT > >, and std::basic_filebuf< char_type, traits_type >.
Definition at line 47 of file streambuf.tcc.
References std::min().
Referenced by std::basic_streambuf< char, char_traits< char > >::sgetn().
template<typename _CharT , typename _Traits > streamsize std::basic_streambuf< _CharT, _Traits >::xsputn
(const char_type *__s, streamsize__n) [protected], [virtual], [inherited]
Multiple character insertion.
Parameters:
s A buffer area.
n Maximum number of characters to write.
Returns:
The number of characters written.
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 in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits<
_CharT > >, and std::basic_filebuf< char_type, traits_type >.
Definition at line 81 of file streambuf.tcc.
References std::min().
Referenced by std::basic_streambuf< char, char_traits< char > >::sputn().
Member Data Documentation
template<typename _CharT, typename _Traits = char_traits<_CharT>> locale std::basic_streambuf< _CharT,
_Traits >::_M_buf_locale [protected], [inherited]
Current locale setting.
Definition at line 189 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::basic_filebuf(), std::basic_streambuf< char,
char_traits< char > >::getloc(), and std::basic_streambuf< char, char_traits< char > >::pubimbue().
Author
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