__gnu_cxx::stdio_sync_filebuf(3)__gnu_cxx::stdio_sync_filebuf(3)NAME__gnu_cxx::stdio_sync_filebuf-
class stdio_sync_filebuf.
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
Public Member Functions
std::__c_file *const file ()
streamsize in_avail ()
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)
stdio_sync_filebuf (std::__c_file *__f)
void stossc ()
int_type sungetc ()
template<> stdio_sync_filebuf< wchar_t >::int_type syncgetc ()
template<> stdio_sync_filebuf< char >::int_type syncgetc ()
template<> stdio_sync_filebuf< wchar_t >::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 syncungetc (int_type
__c)
template<> stdio_sync_filebuf< char >::int_type syncungetc (int_type
__c)
template<> std::streamsize xsgetn (wchar_t *__s, std::streamsize __n)
template<> std::streamsize xsgetn (char *__s, std::streamsize __n)
template<> std::streamsize xsputn (const wchar_t *__s, std::streamsize
__n)
template<> std::streamsize xsputn (const char *__s, std::streamsize
__n)
Protected Member Functions
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 pos_type seekoff (off_type, ios_base::seekdir,
ios_base::openmode=ios_base::in|ios_base::out)
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 seekpos (pos_type,
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 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 ()
int_type syncputc (int_type __c)
int_type syncungetc (int_type __c)
virtual int_type uflow ()
virtual int_type underflow ()
virtual std::streamsize xsgetn (char_type *__s, std::streamsize __n)
virtual std::streamsize xsputn (const char_type *__s, std::streamsize
__n)
Friends
template<bool _IsMove, typename _CharT2 > __gnu_cxx::__enable_if<
__is_char< _CharT2 >::__value, _CharT2 * >::__type __copy_move_a2
(istreambuf_iterator< _CharT2 >, istreambuf_iterator< _CharT2 >,
_CharT2 *)
streamsize __copy_streambufs_eof (__streambuf_type *, __streambuf_type
*, bool &)
class basic_ios< char_type, traits_type >
class basic_istream< char_type, traits_type >
class basic_ostream< char_type, traits_type >
template<typename _CharT2 > __gnu_cxx::__enable_if< __is_char< _CharT2
>::__value, istreambuf_iterator< _CharT2 > >::__type find
(istreambuf_iterator< _CharT2 >, istreambuf_iterator< _CharT2 >,
const _CharT2 &)
template<typename _CharT2 , typename _Traits2 , typename _Alloc >
basic_istream< _CharT2, _Traits2 > & getline (basic_istream<
_CharT2, _Traits2 > &, basic_string< _CharT2, _Traits2, _Alloc > &,
_CharT2)
class istreambuf_iterator< char_type, traits_type >
template<typename _CharT2 , typename _Traits2 , typename _Alloc >
basic_istream< _CharT2, _Traits2 > & operator>> (basic_istream<
_CharT2, _Traits2 > &, basic_string< _CharT2, _Traits2, _Alloc > &)
template<typename _CharT2 , typename _Traits2 > basic_istream< _CharT2,
_Traits2 > & operator>> (basic_istream< _CharT2, _Traits2 > &,
_CharT2 *)
class ostreambuf_iterator< char_type, traits_type >
typedef basic_streambuf< char_type, traits_type > __streambuf_type
locale getloc () const
locale pubimbue (const locale &__loc)
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)
__streambuf_type * pubsetbuf (char_type *__s, streamsize __n)
int pubsync ()
char_type * eback () const
char_type * egptr () const
char_type * epptr () const
char_type * gptr () const
char_type * pbase () const
char_type * pptr () const
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 >
class stdio_sync_filebuf.
Definition at line 47 of file stdio_sync_filebuf.h.
Member Typedef Documentation
template<typename _CharT, typename _Traits> typedef
basic_streambuf<char_type, traits_type> std::basic_streambuf< _CharT,
_Traits >::__streambuf_type [inherited]
This is a non-standard type.
Reimplemented in std::basic_filebuf< _CharT, _Traits >,
std::basic_stringbuf< _CharT, _Traits, _Alloc >, std::basic_filebuf<
_CharT, encoding_char_traits< _CharT > >, and std::basic_filebuf<
char_type, traits_type >.
Definition at line 132 of file streambuf.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>>
typedef _CharT __gnu_cxx::stdio_sync_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 >.
Definition at line 51 of file stdio_sync_filebuf.h.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>>
typedef traits_type::int_type __gnu_cxx::stdio_sync_filebuf< _CharT,
_Traits >::int_type
This is a non-standard type.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 53 of file stdio_sync_filebuf.h.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>>
typedef traits_type::off_type __gnu_cxx::stdio_sync_filebuf< _CharT,
_Traits >::off_type
This is a non-standard type.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 55 of file stdio_sync_filebuf.h.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>>
typedef traits_type::pos_type __gnu_cxx::stdio_sync_filebuf< _CharT,
_Traits >::pos_type
This is a non-standard type.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 54 of file stdio_sync_filebuf.h.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>>
typedef _Traits __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits
>::traits_type
This is a non-standard type.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 52 of file stdio_sync_filebuf.h.
Member Function Documentation
template<typename _CharT, typename _Traits> 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 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().
template<typename _CharT, typename _Traits> char_type*
std::basic_streambuf< _CharT, _Traits >::egptr () const [inline,
protected, 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 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().
template<typename _CharT, typename _Traits> char_type*
std::basic_streambuf< _CharT, _Traits >::epptr () const [inline,
protected, 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 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().
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 79 of file stdio_sync_filebuf.h.
template<typename _CharT, typename _Traits> 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 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().
template<typename _CharT, typename _Traits> 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 221 of file streambuf.
template<typename _CharT, typename _Traits> char_type*
std::basic_streambuf< _CharT, _Traits >::gptr () const [inline,
protected, 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 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().
template<typename _CharT, typename _Traits> 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 552 of file streambuf.
template<typename _CharT, typename _Traits> 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 261 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 132 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 107 of file stdio_sync_filebuf.h.
template<typename _CharT, typename _Traits> 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 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().
template<typename _CharT, typename _Traits> 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 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().
template<typename _CharT, typename _Traits> char_type*
std::basic_streambuf< _CharT, _Traits >::pptr () const [inline,
protected, 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 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().
template<typename _CharT, typename _Traits> 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 204 of file streambuf.
template<typename _CharT, typename _Traits> 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]
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 238 of file streambuf.
template<typename _CharT, typename _Traits> pos_type std::basic_streambuf<
_CharT, _Traits >::pubseekpos (pos_type __sp, ios_base::openmode __mode
= ios_base::in | ios_base::out) [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 243 of file streambuf.
template<typename _CharT, typename _Traits> __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 234 of file streambuf.
template<typename _CharT, typename _Traits> int std::basic_streambuf<
_CharT, _Traits >::pubsync () [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 248 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::sync().
template<typename _CharT, typename _Traits> 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 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++().
template<typename _CharT, typename _Traits> 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_stringbuf< _CharT, _Traits, _Alloc >, std::basic_filebuf<
_CharT, encoding_char_traits< _CharT > >, and std::basic_filebuf<
char_type, traits_type >.
Definition at line 578 of file streambuf.
template<typename _CharT, typename _Traits> 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_stringbuf< _CharT, _Traits, _Alloc >, std::basic_filebuf<
_CharT, encoding_char_traits< _CharT > >, and std::basic_filebuf<
char_type, traits_type >.
Definition at line 590 of file streambuf.
template<typename _CharT, typename _Traits> 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_stringbuf< _CharT, _Traits, _Alloc >, std::basic_filebuf<
_CharT, encoding_char_traits< _CharT > >, and std::basic_filebuf<
char_type, traits_type >.
Definition at line 567 of file streambuf.
template<typename _CharT, typename _Traits> 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 485 of file streambuf.
template<typename _CharT, typename _Traits> 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 531 of file streambuf.
template<typename _CharT, typename _Traits> 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 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().
template<typename _CharT, typename _Traits> 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 334 of file streambuf.
template<typename _CharT, typename _Traits> 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 @c showmanyc are
'es-how-many-see', not 'show-manic.
Reimplemented in std::basic_filebuf< _CharT, _Traits >,
std::basic_stringbuf< _CharT, _Traits, _Alloc >, std::basic_filebuf<
_CharT, encoding_char_traits< _CharT > >, and std::basic_filebuf<
char_type, traits_type >.
Definition at line 625 of file streambuf.
template<typename _CharT, typename _Traits> 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 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().
template<typename _CharT, typename _Traits> 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 348 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::putback().
template<typename _CharT, typename _Traits> 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 400 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::get(), and
std::ostreambuf_iterator< _CharT, _Traits >::operator=().
template<typename _CharT, typename _Traits> 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 426 of file streambuf.
template<typename _CharT, typename _Traits> void std::basic_streambuf<
_CharT, _Traits >::stossc () [inline, inherited]
Tosses a character. Advances the read pointer, ignoring the character
that would have been read.
See http://gcc.gnu.org/ml/libstdc++/2002-05/msg00168.html
Definition at line 758 of file streambuf.
template<typename _CharT, typename _Traits> 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 373 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 151 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 99 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 92 of file stdio_sync_filebuf.h.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>>
virtual std::streamsize __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits
>::xsgetn (char_type * __s, std::streamsize __n) [protected, virtual]
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 from std::basic_streambuf< _CharT, _Traits >.
template<typename _CharT , typename _Traits = std::char_traits<_CharT>>
virtual std::streamsize __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits
>::xsputn (const char_type * __s, std::streamsize __n) [protected,
virtual]
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 from std::basic_streambuf< _CharT, _Traits >.
Member Data Documentation
template<typename _CharT, typename _Traits> 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().
template<typename _CharT, typename _Traits> char_type*
std::basic_streambuf< _CharT, _Traits >::_M_in_beg [protected,
inherited] This is based on _IO_FILE, just reordered to be more
consistent, and is intended to be the most minimal abstraction for an
internal buffer.
· get == input == read
· put == output == write
Definition at line 179 of file streambuf.
template<typename _CharT, typename _Traits> char_type*
std::basic_streambuf< _CharT, _Traits >::_M_in_cur [protected,
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 180 of file streambuf.
template<typename _CharT, typename _Traits> char_type*
std::basic_streambuf< _CharT, _Traits >::_M_in_end [protected,
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 181 of file streambuf.
template<typename _CharT, typename _Traits> char_type*
std::basic_streambuf< _CharT, _Traits >::_M_out_beg [protected,
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 182 of file streambuf.
template<typename _CharT, typename _Traits> char_type*
std::basic_streambuf< _CharT, _Traits >::_M_out_cur [protected,
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 183 of file streambuf.
template<typename _CharT, typename _Traits> char_type*
std::basic_streambuf< _CharT, _Traits >::_M_out_end [protected,
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 184 of file streambuf.
Author
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libstdc++ 22 Nov 2013 __gnu_cxx::stdio_sync_filebuf(3)
