Provided by: libstdc++-9-doc_9.5.0-3ubuntu1_all 
NAME
std::basic_stringbuf< _CharT, _Traits, _Alloc > - The actual work of input and output (for
std::string).
SYNOPSIS
Inherits std::basic_streambuf< _CharT, _Traits >.
Public Types
typedef __string_type::size_type __size_type
typedef basic_streambuf< char_type, traits_type > __streambuf_type
typedef basic_string< char_type, _Traits, _Alloc > __string_type
typedef _Alloc allocator_type
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
basic_stringbuf ()
Starts with an empty string buffer.
basic_stringbuf (basic_stringbuf &&__rhs)
basic_stringbuf (const __string_type &__str, ios_base::openmode
__mode=ios_base::in|ios_base::out)
Starts with an existing string buffer.
basic_stringbuf (const basic_stringbuf &)=delete
basic_stringbuf (ios_base::openmode __mode)
Starts with an empty string buffer.
locale getloc () const
Locale access.
streamsize in_avail ()
Looking ahead into the stream.
basic_stringbuf & operator= (basic_stringbuf &&__rhs)
basic_stringbuf & operator= (const basic_stringbuf &)=delete
locale pubimbue (const locale &__loc)
Entry point for imbue().
int_type sbumpc ()
Getting the next character.
int_type sgetc ()
Getting the next character.
streamsize sgetn (char_type *__s, streamsize __n)
Entry point for xsgetn.
int_type snextc ()
Getting the next character.
int_type sputbackc (char_type __c)
Pushing characters back into the input stream.
int_type sputc (char_type __c)
Entry point for all single-character output functions.
streamsize sputn (const char_type *__s, streamsize __n)
Entry point for all single-character output functions.
__string_type str () const
Copying out the string buffer.
void str (const __string_type &__s)
Setting a new buffer.
int_type sungetc ()
Moving backwards in the input stream.
void swap (basic_stringbuf &__rhs)
basic_streambuf * pubsetbuf (char_type *__s, streamsize __n)
Entry points for derived buffer functions.
pos_type pubseekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode
__mode=ios_base::in|ios_base::out)
Alters the stream position.
pos_type pubseekpos (pos_type __sp, ios_base::openmode
__mode=ios_base::in|ios_base::out)
Alters the stream position.
int pubsync ()
Calls virtual sync function.
Protected Member Functions
void __safe_gbump (streamsize __n)
void __safe_pbump (streamsize __n)
void _M_pbump (char_type *__pbeg, char_type *__pend, off_type __off)
void _M_stringbuf_init (ios_base::openmode __mode)
void _M_sync (char_type *__base, __size_type __i, __size_type __o)
void _M_update_egptr ()
void gbump (int __n)
Moving the read position.
virtual void imbue (const locale &__loc __attribute__((__unused__)))
Changes translations.
virtual int_type overflow (int_type __c __attribute__((__unused__))=traits_type::eof())
Consumes data from the buffer; writes to the controlled sequence.
virtual int_type overflow (int_type __c=traits_type::eof())
virtual int_type pbackfail (int_type __c __attribute__((__unused__))=traits_type::eof())
Tries to back up the input sequence.
virtual int_type pbackfail (int_type __c=traits_type::eof())
void pbump (int __n)
Moving the write position.
virtual pos_type seekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode
__mode=ios_base::in|ios_base::out)
Alters the stream positions.
virtual pos_type seekpos (pos_type __sp, ios_base::openmode
__mode=ios_base::in|ios_base::out)
Alters the stream positions.
virtual __streambuf_type * setbuf (char_type *__s, streamsize __n)
Manipulates the buffer.
void setg (char_type *__gbeg, char_type *__gnext, char_type *__gend)
Setting the three read area pointers.
void setp (char_type *__pbeg, char_type *__pend)
Setting the three write area pointers.
virtual streamsize showmanyc ()
Investigating the data available.
void swap (basic_streambuf &__sb)
virtual int sync ()
Synchronizes the buffer arrays with the controlled sequences.
virtual int_type uflow ()
Fetches more data from the controlled sequence.
virtual int_type underflow ()
Fetches more data from the controlled sequence.
virtual streamsize xsgetn (char_type *__s, streamsize __n)
Multiple character extraction.
virtual streamsize xsputn (const char_type *__s, streamsize __n)
Multiple character insertion.
char_type * eback () const
Access to the get area.
char_type * gptr () const
Access to the get area.
char_type * egptr () const
Access to the get area.
char_type * pbase () const
Access to the put area.
char_type * pptr () const
Access to the put area.
char_type * epptr () const
Access to the put area.
Protected Attributes
locale _M_buf_locale
Current locale setting.
char_type * _M_in_beg
Start of get area.
char_type * _M_in_cur
Current read area.
char_type * _M_in_end
End of get area.
ios_base::openmode _M_mode
Place to stash in || out || in | out settings for current stringbuf.
char_type * _M_out_beg
Start of put area.
char_type * _M_out_cur
Current put area.
char_type * _M_out_end
End of put area.
__string_type _M_string
Detailed Description
template<typename _CharT, typename _Traits, typename _Alloc>
class std::basic_stringbuf< _CharT, _Traits, _Alloc >"The actual work of input and output
(for std::string).
Template Parameters
_CharT Type of character stream.
_Traits Traits for character type, defaults to char_traits<_CharT>.
_Alloc Allocator type, defaults to allocator<_CharT>.
This class associates either or both of its input and output sequences with a sequence of
characters, which can be initialized from, or made available as, a std::basic_string.
(Paraphrased from [27.7.1]/1.)
For this class, open modes (of type ios_base::openmode) have in set if the input sequence
can be read, and out set if the output sequence can be written.
Definition at line 65 of file sstream.
Member Typedef Documentation
template<typename _CharT , typename _Traits , typename _Alloc > typedef
__string_type::size_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::__size_type
Definition at line 81 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > typedef
basic_streambuf<char_type, traits_type> std::basic_stringbuf< _CharT, _Traits, _Alloc
>::__streambuf_type
Definition at line 79 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > typedef
basic_string<char_type, _Traits, _Alloc> std::basic_stringbuf< _CharT, _Traits, _Alloc
>::__string_type
Definition at line 80 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > typedef _Alloc
std::basic_stringbuf< _CharT, _Traits, _Alloc >::allocator_type
Definition at line 74 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > typedef _CharT
std::basic_stringbuf< _CharT, _Traits, _Alloc >::char_type
Definition at line 70 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > typedef traits_type::int_type
std::basic_stringbuf< _CharT, _Traits, _Alloc >::int_type
Definition at line 75 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > typedef traits_type::off_type
std::basic_stringbuf< _CharT, _Traits, _Alloc >::off_type
Definition at line 77 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > typedef traits_type::pos_type
std::basic_stringbuf< _CharT, _Traits, _Alloc >::pos_type
Definition at line 76 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > typedef _Traits
std::basic_stringbuf< _CharT, _Traits, _Alloc >::traits_type
Definition at line 71 of file sstream.
Constructor & Destructor Documentation
template<typename _CharT , typename _Traits , typename _Alloc > std::basic_stringbuf< _CharT,
_Traits, _Alloc >::basic_stringbuf () [inline]
Starts with an empty string buffer. The default constructor initializes the parent class
using its own default ctor.
Definition at line 99 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > std::basic_stringbuf< _CharT,
_Traits, _Alloc >::basic_stringbuf (ios_base::openmode __mode) [inline], [explicit]
Starts with an empty string buffer.
Parameters
__mode Whether the buffer can read, or write, or both.
The default constructor initializes the parent class using its own default ctor.
Definition at line 111 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > std::basic_stringbuf< _CharT,
_Traits, _Alloc >::basic_stringbuf (const __string_type & __str, ios_base::openmode __mode
= ios_base::in | ios_base::out) [inline], [explicit]
Starts with an existing string buffer.
Parameters
__str A string to copy as a starting buffer.
__mode Whether the buffer can read, or write, or both.
This constructor initializes the parent class using its own default ctor.
Definition at line 124 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > std::basic_stringbuf< _CharT,
_Traits, _Alloc >::basic_stringbuf (basic_stringbuf< _CharT, _Traits, _Alloc > && __rhs)
[inline]
Definition at line 133 of file sstream.
Member Function Documentation
template<typename _CharT , typename _Traits > void std::basic_streambuf< _CharT, _Traits
>::__safe_gbump (streamsize __n) [inline], [protected], [inherited]
Definition at line 802 of file streambuf.
template<typename _CharT , typename _Traits > void std::basic_streambuf< _CharT, _Traits
>::__safe_pbump (streamsize __n) [inline], [protected], [inherited]
Definition at line 805 of file streambuf.
template<class _CharT , class _Traits , class _Alloc > void std::basic_stringbuf< _CharT,
_Traits, _Alloc >::_M_pbump (char_type * __pbeg, char_type * __pend, off_type __off)
[protected]
Definition at line 276 of file sstream.tcc.
template<typename _CharT , typename _Traits , typename _Alloc > void std::basic_stringbuf<
_CharT, _Traits, _Alloc >::_M_stringbuf_init (ios_base::openmode __mode) [inline],
[protected]
Definition at line 213 of file sstream.
template<class _CharT , class _Traits , class _Alloc > void std::basic_stringbuf< _CharT,
_Traits, _Alloc >::_M_sync (char_type * __base, __size_type __i, __size_type __o)
[protected]
Definition at line 245 of file sstream.tcc.
template<typename _CharT , typename _Traits , typename _Alloc > void std::basic_stringbuf<
_CharT, _Traits, _Alloc >::_M_update_egptr () [inline], [protected]
Definition at line 290 of file sstream.
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 489 of file streambuf.
template<typename _CharT , typename _Traits > 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 495 of file streambuf.
template<typename _CharT , typename _Traits > 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 542 of file streambuf.
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 505 of file streambuf.
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 233 of file streambuf.
template<typename _CharT , typename _Traits > 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 492 of file streambuf.
template<typename _CharT , typename _Traits > virtual void std::basic_streambuf< _CharT,
_Traits >::imbue (const locale &__loc __attribute__(__unused__)) [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.
Definition at line 583 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 291 of file streambuf.
template<typename _CharT , typename _Traits , typename _Alloc > basic_stringbuf &
std::basic_stringbuf< _CharT, _Traits, _Alloc >::operator= (basic_stringbuf< _CharT,
_Traits, _Alloc > && __rhs) [inline]
Definition at line 143 of file sstream.
template<typename _CharT , typename _Traits > virtual int_type std::basic_streambuf< _CharT,
_Traits >::overflow (int_type __c __attribute__(__unused__) = traits_type::eof())
[inline], [protected], [virtual], [inherited]
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 775 of file streambuf.
template<class _CharT , class _Traits , class _Alloc > basic_stringbuf< _CharT, _Traits,
_Alloc >::int_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow (int_type __c
= traits_type::eof()) [protected], [virtual]
Definition at line 79 of file sstream.tcc.
template<typename _CharT , typename _Traits > virtual int_type std::basic_streambuf< _CharT,
_Traits >::pbackfail (int_type __c __attribute__(__unused__) = traits_type::eof())
[inline], [protected], [virtual], [inherited]
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().
Definition at line 731 of file streambuf.
template<class _CharT , class _Traits , class _Alloc > basic_stringbuf< _CharT, _Traits,
_Alloc >::int_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::pbackfail (int_type
__c = traits_type::eof()) [protected], [virtual]
Definition at line 45 of file sstream.tcc.
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 536 of file streambuf.
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 552 of file streambuf.
template<typename _CharT , typename _Traits > 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 539 of file streambuf.
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 216 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]
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 258 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]
Alters the stream position.
Parameters
__sp Position
__mode Value for ios_base::openmode.
Calls virtual seekpos function.
Definition at line 270 of file streambuf.
template<typename _CharT , typename _Traits > basic_streambuf * 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 246 of file streambuf.
template<typename _CharT , typename _Traits > int std::basic_streambuf< _CharT, _Traits
>::pubsync () [inline], [inherited]
Calls virtual sync function.
Definition at line 278 of file streambuf.
Referenced by std::wbuffer_convert< _Codecvt, _Elem, _Tr >::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 323 of file streambuf.
Referenced by std::basic_istream< char >::getline(), and std::basic_istream< char
>::seekg().
template<class _CharT , class _Traits , class _Alloc > basic_stringbuf< _CharT, _Traits,
_Alloc >::pos_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff (off_type,
ios_base::seekdir, ios_base::openmode = ios_base::in | ios_base::out) [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 from std::basic_streambuf< _CharT, _Traits >.
Definition at line 167 of file sstream.tcc.
References std::ios_base::cur, std::ios_base::end, std::ios_base::in, and
std::ios_base::out.
template<class _CharT , class _Traits , class _Alloc > basic_stringbuf< _CharT, _Traits,
_Alloc >::pos_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos (pos_type,
ios_base::openmode = ios_base::in | ios_base::out) [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 from std::basic_streambuf< _CharT, _Traits >.
Definition at line 215 of file sstream.tcc.
References std::ios_base::in, and std::ios_base::out.
template<typename _CharT , typename _Traits , typename _Alloc > virtual __streambuf_type *
std::basic_stringbuf< _CharT, _Traits, _Alloc >::setbuf (char_type * __s, streamsize __n)
[inline], [protected], [virtual]
Manipulates the buffer.
Parameters
__s Pointer to a buffer area.
__n Size of __s.
Returns
this
If no buffer has already been created, and both __s and __n are non-zero, then __s is used
as a buffer; see
https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering for
more.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 255 of file sstream.
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 516 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 562 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 345 of file streambuf.
Referenced by std::basic_istream< char >::getline(), and std::basic_istream< char
>::tellg().
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 364 of file streambuf.
template<typename _CharT , typename _Traits , typename _Alloc > virtual streamsize
std::basic_stringbuf< _CharT, _Traits, _Alloc >::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 from std::basic_streambuf< _CharT, _Traits >.
Definition at line 223 of file sstream.
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 305 of file streambuf.
Referenced by std::basic_istream< char >::getline(), std::basic_istream< char
>::putback(), and std::basic_istream< char >::tellg().
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 379 of file streambuf.
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 431 of file streambuf.
Referenced by 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 457 of file streambuf.
template<typename _CharT , typename _Traits , typename _Alloc > __string_type
std::basic_stringbuf< _CharT, _Traits, _Alloc >::str () const [inline]
Copying out the string buffer.
Returns
A copy of one of the underlying sequences.
If the buffer is only created in input mode, the underlying character sequence is equal to
the input sequence; otherwise, it is equal to the output sequence. [27.7.1.2]/1
Definition at line 178 of file sstream.
template<typename _CharT , typename _Traits , typename _Alloc > void std::basic_stringbuf<
_CharT, _Traits, _Alloc >::str (const __string_type & __s) [inline]
Setting a new buffer.
Parameters
__s The string to use as a new sequence.
Deallocates any previous stored sequence, then copies s to use as a new one.
Definition at line 202 of file sstream.
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 404 of file streambuf.
template<typename _CharT , typename _Traits > void std::basic_streambuf< _CharT, _Traits
>::swap (basic_streambuf< _CharT, _Traits > & __sb) [inline], [protected], [inherited]
Definition at line 819 of file streambuf.
template<typename _CharT , typename _Traits , typename _Alloc > void std::basic_stringbuf<
_CharT, _Traits, _Alloc >::swap (basic_stringbuf< _CharT, _Traits, _Alloc > & __rhs)
[inline]
Definition at line 156 of file sstream.
template<typename _CharT , typename _Traits > virtual int std::basic_streambuf< _CharT,
_Traits >::sync (void) [inline], [protected], [virtual], [inherited]
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::wbuffer_convert< _Codecvt, _Elem, _Tr >,
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, _Traits >,
std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< _CharT,
std::char_traits< _CharT > >, and std::basic_filebuf< char_type, traits_type >.
Definition at line 634 of file streambuf.
template<typename _CharT , typename _Traits > virtual int_type std::basic_streambuf< _CharT,
_Traits >::uflow () [inline], [protected], [virtual], [inherited]
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 707 of file streambuf.
template<class _CharT , class _Traits , class _Alloc > basic_stringbuf< _CharT, _Traits,
_Alloc >::int_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow [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
https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html
Note
Base class version does nothing, returns eof().
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 149 of file sstream.tcc.
References std::ios_base::in.
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 > >, std::basic_filebuf< _CharT, std::char_traits< _CharT >
>, and std::basic_filebuf< char_type, traits_type >.
Definition at line 45 of file streambuf.tcc.
References std::min().
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 > >, std::basic_filebuf< _CharT, std::char_traits< _CharT >
>, and std::basic_filebuf< char_type, traits_type >.
Definition at line 79 of file streambuf.tcc.
References std::min().
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 199 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]
Start of get area.
Definition at line 191 of file streambuf.
template<typename _CharT , typename _Traits > char_type* std::basic_streambuf< _CharT, _Traits
>::_M_in_cur [protected], [inherited]
Current read area.
Definition at line 192 of file streambuf.
template<typename _CharT , typename _Traits > char_type* std::basic_streambuf< _CharT, _Traits
>::_M_in_end [protected], [inherited]
End of get area.
Definition at line 193 of file streambuf.
template<typename _CharT , typename _Traits , typename _Alloc > ios_base::openmode
std::basic_stringbuf< _CharT, _Traits, _Alloc >::_M_mode [protected]
Place to stash in || out || in | out settings for current stringbuf.
Definition at line 85 of file sstream.
template<typename _CharT , typename _Traits > char_type* std::basic_streambuf< _CharT, _Traits
>::_M_out_beg [protected], [inherited]
Start of put area.
Definition at line 194 of file streambuf.
template<typename _CharT , typename _Traits > char_type* std::basic_streambuf< _CharT, _Traits
>::_M_out_cur [protected], [inherited]
Current put area.
Definition at line 195 of file streambuf.
template<typename _CharT , typename _Traits > char_type* std::basic_streambuf< _CharT, _Traits
>::_M_out_end [protected], [inherited]
End of put area.
Definition at line 196 of file streambuf.
template<typename _CharT , typename _Traits , typename _Alloc > __string_type
std::basic_stringbuf< _CharT, _Traits, _Alloc >::_M_string [protected]
Definition at line 88 of file sstream.
Author
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