std::basic_streambuf<; _CharT, _Traitstd::basic_streambuf< _CharT, _Traits >(3)
NAME
std::basic_streambuf< _CharT, _Traits > -
SYNOPSIS
Inherited by __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >,
std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >,
std::basic_filebuf< char_type, traits_type >, std::basic_filebuf<
_CharT, _Traits >, and std::basic_stringbuf< _CharT, _Traits, _Alloc >.
Public Types
typedef _CharT char_type
typedef _Traits traits_type
typedef traits_type::int_type int_type
typedef traits_type::pos_type pos_type
typedef traits_type::off_type off_type
typedef basic_streambuf
< char_type, traits_type > __streambuf_type"
Public Member Functions
virtual ~basic_streambuf ()
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 ()
basic_streambuf * 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
basic_streambuf ()
void __safe_gbump (streamsize __n)
void __safe_pbump (streamsize __n)
void gbump (int __n)
virtual void imbue (const locale &__loc)
void pbump (int __n)
virtual pos_type seekoff (off_type, ios_base::seekdir,
ios_base::openmode=ios_base::in|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 ()
virtual int_type return traits_type::eof ()
virtual int_type uflow ()
virtual int_type underflow ()
virtual streamsize xsgetn (char_type *__s, 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
virtual int_type
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 (basic_streambuf *, basic_streambuf *,
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 > basic_istream< _CharT2,
_Traits2 > & operator>> (basic_istream< _CharT2, _Traits2 > &,
_CharT2 *)"
template<typename _CharT2 , typename _Traits2 , typename _Alloc >
basic_istream< _CharT2,
_Traits2 > & operator>> (basic_istream< _CharT2, _Traits2 > &,
basic_string< _CharT2, _Traits2, _Alloc > &)"
class ostreambuf_iterator< char_type, traits_type >
Detailed Description
template<typename _CharT, typename _Traits = char_traits<_CharT>>class
std::basic_streambuf< _CharT, _Traits >
The actual work of input and output (interface).
Template Parameters:
_CharT Type of character stream.
_Traits Traits for character type, defaults to char_traits<_CharT>.
This is a base class. Derived stream buffers each control a pair of
character sequences: one for input, and one for output.
Section [27.5.1] of the standard describes the requirements and
behavior of stream buffer classes. That section (three paragraphs) is
reproduced here, for simplicity and accuracy.
1. Stream buffers can impose various constraints on the sequences they
control. Some constraints are:
· The controlled input sequence can be not readable.
· The controlled output sequence can be not writable.
· The controlled sequences can be associated with the contents of
other representations for character sequences, such as external
files.
· The controlled sequences can support operations directly to or from
associated sequences.
· The controlled sequences can impose limitations on how the program
can read characters from a sequence, write characters to a
sequence, put characters back into an input sequence, or alter the
stream position.
2. Each sequence is characterized by three pointers which, if non-
null, all point into the same charT array object. The array object
represents, at any moment, a (sub)sequence of characters from the
sequence. Operations performed on a sequence alter the values
stored in these pointers, perform reads and writes directly to or
from associated sequences, and alter the stream position and
conversion state as needed to maintain this subsequence
relationship. The three pointers are:
· the beginning pointer, or lowest element address in the array
(called xbeg here);
· the next pointer, or next element address that is a current
candidate for reading or writing (called xnext here);
· the end pointer, or first element address beyond the end of the
array (called xend here).
3. The following semantic constraints shall always apply for any set
of three pointers for a sequence, using the pointer names given
immediately above:
· If xnext is not a null pointer, then xbeg and xend shall also be
non-null pointers into the same charT array, as described above;
otherwise, xbeg and xend shall also be null.
· If xnext is not a null pointer and xnext < xend for an output
sequence, then a write position is available. In this case, *xnext
shall be assignable as the next element to write (to put, or to
store a character value, into the sequence).
· If xnext is not a null pointer and xbeg < xnext for an input
sequence, then a putback position is available. In this case,
xnext[-1] shall have a defined value and is the next (preceding)
element to store a character that is put back into the input
sequence.
· If xnext is not a null pointer and xnext< xend for an input
sequence, then a read position is available. In this case, *xnext
shall have a defined value and is the next element to read (to get,
or to obtain a character value, from the sequence).
Definition at line 80 of file iosfwd.
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
This is a non-standard type.
Definition at line 138 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> typedef
_CharT std::basic_streambuf< _CharT, _Traits >::char_type
These are standard types. They permit a standardized way of referring
to names of (or names dependent on) the template parameters, which are
specific to the implementation.
Definition at line 129 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> typedef
traits_type::int_type std::basic_streambuf< _CharT, _Traits >::int_type
These are standard types. They permit a standardized way of referring
to names of (or names dependent on) the template parameters, which are
specific to the implementation.
Definition at line 131 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> typedef
traits_type::off_type std::basic_streambuf< _CharT, _Traits >::off_type
These are standard types. They permit a standardized way of referring
to names of (or names dependent on) the template parameters, which are
specific to the implementation.
Definition at line 133 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> typedef
traits_type::pos_type std::basic_streambuf< _CharT, _Traits >::pos_type
These are standard types. They permit a standardized way of referring
to names of (or names dependent on) the template parameters, which are
specific to the implementation.
Definition at line 132 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> typedef
_Traits std::basic_streambuf< _CharT, _Traits >::traits_type
These are standard types. They permit a standardized way of referring
to names of (or names dependent on) the template parameters, which are
specific to the implementation.
Definition at line 130 of file streambuf.
Constructor & Destructor Documentation
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual
std::basic_streambuf< _CharT, _Traits >::~basic_streambuf () [inline],
[virtual]
Destructor deallocates no buffer space.
Definition at line 197 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>>
std::basic_streambuf< _CharT, _Traits >::basic_streambuf () [inline],
[protected]
Base constructor. Only called from derived constructors, and sets up
all the buffer data to zero, including the pointers described in the
basic_streambuf class description. Note that, as a result,
· the class starts with no read nor write positions available,
· this is not an error
Definition at line 463 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]
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 482 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]
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 488 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]
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 535 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char >
>::sputc().
template<typename _CharT, typename _Traits = char_traits<_CharT>> void
std::basic_streambuf< _CharT, _Traits >::gbump (int__n) [inline],
[protected]
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 498 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]
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 226 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]
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 485 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
&__loc) [inline], [protected], [virtual]
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 576 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]
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 284 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>>
char_type* std::basic_streambuf< _CharT, _Traits >::pbase () const
[inline], [protected]
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 529 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]
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 545 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]
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 532 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]
Entry point for imbue().
Parameters:
__loc The new locale.
Returns:
The previous locale.
Calls the derived imbue(__loc).
Definition at line 209 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]
Alters the stream position.
Parameters:
__off Offset.
__way Value for ios_base::seekdir.
__mode Value for ios_base::openmode.
Calls virtual seekoff function.
Definition at line 251 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]
Alters the stream position.
Parameters:
__sp Position
__mode Value for ios_base::openmode.
Calls virtual seekpos function.
Definition at line 263 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>>
basic_streambuf* std::basic_streambuf< _CharT, _Traits >::pubsetbuf
(char_type *__s, streamsize__n) [inline]
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 239 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> int
std::basic_streambuf< _CharT, _Traits >::pubsync () [inline]
Calls virtual sync function.
Definition at line 271 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]
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 316 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]
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 602 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]
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 614 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]
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 591 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]
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 509 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]
Setting the three write area pointers.
Parameters:
__pbeg A pointer.
__pend A pointer.
Postcondition:
__pbeg == pbase(), __pbeg == pptr(), and __pend == epptr()
Definition at line 555 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]
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 338 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]
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 357 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual
streamsize std::basic_streambuf< _CharT, _Traits >::showmanyc ()
[inline], [protected], [virtual]
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 649 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]
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 298 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]
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 372 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]
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 424 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]
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 450 of file streambuf.
template<typename _CharT, typename _Traits = char_traits<_CharT>> int_type
std::basic_streambuf< _CharT, _Traits >::sungetc () [inline]
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 397 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::unget().
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual
int std::basic_streambuf< _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 in std::basic_filebuf< _CharT, _Traits >,
std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >,
std::basic_filebuf< char_type, traits_type >, and
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >.
Definition at line 627 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char >
>::pubsync().
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual
int_type return std::basic_streambuf< _CharT, _Traits
>::traits_type::eof () [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().
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual
int_type std::basic_streambuf< _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 in __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >.
Definition at line 700 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char >
>::sbumpc().
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual
int_type std::basic_streambuf< _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 in std::basic_filebuf< _CharT, _Traits >,
std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >,
std::basic_filebuf< char_type, traits_type >, std::basic_stringbuf<
_CharT, _Traits, _Alloc >, and __gnu_cxx::stdio_sync_filebuf< _CharT,
_Traits >.
Definition at line 687 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char >
>::sgetc(), and std::basic_streambuf< char, char_traits< char >
>::uflow().
template<typename _CharT , typename _Traits > streamsize
std::basic_streambuf< _CharT, _Traits >::xsgetn (char_type *__s,
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 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 46 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]
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 80 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]
Current locale setting.
Definition at line 192 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().
template<typename _CharT, typename _Traits = char_traits<_CharT>>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_beg
[protected]
Start of get area.
Definition at line 184 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char >
>::eback(), and std::basic_streambuf< char, char_traits< char >
>::setg().
template<typename _CharT, typename _Traits = char_traits<_CharT>>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_cur
[protected]
Current read area.
Definition at line 185 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char >
>::gbump(), std::basic_streambuf< char, char_traits< char > >::gptr(),
and std::basic_streambuf< char, char_traits< char > >::setg().
template<typename _CharT, typename _Traits = char_traits<_CharT>>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_end
[protected]
End of get area.
Definition at line 186 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char >
>::egptr(), and std::basic_streambuf< char, char_traits< char >
>::setg().
template<typename _CharT, typename _Traits = char_traits<_CharT>>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_beg
[protected]
Start of put area.
Definition at line 187 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char >
>::pbase(), and std::basic_streambuf< char, char_traits< char >
>::setp().
template<typename _CharT, typename _Traits = char_traits<_CharT>>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_cur
[protected]
Current put area.
Definition at line 188 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char >
>::pbump(), std::basic_streambuf< char, char_traits< char > >::pptr(),
and std::basic_streambuf< char, char_traits< char > >::setp().
template<typename _CharT, typename _Traits = char_traits<_CharT>>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_end
[protected]
End of put area.
Definition at line 189 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char >
>::epptr(), and std::basic_streambuf< char, char_traits< char >
>::setp().
template<typename _CharT, typename _Traits = char_traits<_CharT>> virtual
std::basic_streambuf< _CharT, _Traits >::int_type [protected]
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().
Definition at line 769 of file streambuf.
Author
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libstdc++ Wed std::basic_streambuf< _CharT, _Traits >(3)
