Inheritance diagram for std::basic_stringbuf< _CharT, _Traits, _Alloc >:

[legend]

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 (ios_base::openmode __mode=ios_base::in\|ios_base::out)

	basic_stringbuf (const __string_type &__str, ios_base::openmode __mode=ios_base::in\|ios_base::out)

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)

__string_type	str () const

void	str (const __string_type &__s)

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
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)

virtual void	imbue (const locale &__loc)

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 __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in\|ios_base::out)

virtual pos_type	seekpos (pos_type __sp, ios_base::openmode __mode=ios_base::in\|ios_base::out)

virtual __streambuf_type *	setbuf (char_type *__s, streamsize __n)

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

ios_base::openmode	_M_mode

char_type *	_M_out_beg

char_type *	_M_out_cur

char_type *	_M_out_end

__string_type	_M_string

Detailed Description

template<typename _CharT, typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT>>
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 93 of file iosfwd.

Constructor & Destructor Documentation

template<typename _CharT, typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT>>

std::basic_stringbuf< _CharT, _Traits, _Alloc >::basic_stringbuf ( ios_base::openmode __mode = ios_base::in | ios_base::out )

inlineexplicit

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 98 of file sstream.

template<typename _CharT, typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT>>

std::basic_stringbuf< _CharT, _Traits, _Alloc >::basic_stringbuf	(	const __string_type &	__str,
		ios_base::openmode	__mode = `ios_base::in \| ios_base::out`
	)

inlineexplicit

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 111 of file sstream.

Member Function Documentation

template<typename _CharT, typename _Traits = char_traits<_CharT>>

char_type* std::basic_streambuf< _CharT, _Traits >::eback ( ) const

inlineprotectedinherited

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

inlineprotectedinherited

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

inlineprotectedinherited

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 )

inlineprotectedinherited

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

inlineinherited

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

inlineprotectedinherited

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 )

inlineprotectedvirtualinherited

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 ( )

inlineinherited

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

inlineprotectedinherited

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 )

inlineprotectedinherited

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

inlineprotectedinherited

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 )

inlineinherited

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`
	)

inlineinherited

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`
	)

inlineinherited

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
	)

inlineinherited

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 ( )

inlineinherited

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 ( )

inlineinherited

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<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`
	)

protectedvirtual

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 149 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`
	)

protectedvirtual

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 197 of file sstream.tcc.

References std::ios_base::in.

template<typename _CharT, typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT>>

virtual __streambuf_type* std::basic_stringbuf< _CharT, _Traits, _Alloc >::setbuf	(	char_type *	__s,
		streamsize	__n
	)

inlineprotectedvirtual

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 http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25s02.html for more.

Reimplemented from std::basic_streambuf< _CharT, _Traits >.

Definition at line 202 of file sstream.

References std::basic_string< _CharT, _Traits, _Alloc >::clear().

template<typename _CharT, typename _Traits = char_traits<_CharT>>

void std::basic_streambuf< _CharT, _Traits >::setg	(	char_type *	__gbeg,
		char_type *	__gnext,
		char_type *	__gend
	)

inlineprotectedinherited

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
	)

inlineprotectedinherited

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 ( )

inlineinherited

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
	)

inlineinherited

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>, typename _Alloc = allocator<_CharT>>

virtual streamsize std::basic_stringbuf< _CharT, _Traits, _Alloc >::showmanyc ( )

inlineprotectedvirtual

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 170 of file sstream.

References std::basic_stringbuf< _CharT, _Traits, _Alloc >::_M_mode, std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gptr(), and std::ios_base::in.

template<typename _CharT, typename _Traits = char_traits<_CharT>>

int_type std::basic_streambuf< _CharT, _Traits >::snextc ( )

inlineinherited

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 )

inlineinherited

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 )

inlineinherited

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
	)

inlineinherited

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>, typename _Alloc = allocator<_CharT>>

__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 126 of file sstream.

References std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::pbase(), and std::basic_streambuf< _CharT, _Traits >::pptr().

template<typename _CharT, typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT>>

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 150 of file sstream.

References std::basic_stringbuf< _CharT, _Traits, _Alloc >::_M_mode, std::basic_string< _CharT, _Traits, _Alloc >::assign(), std::basic_string< _CharT, _Traits, _Alloc >::data(), and std::basic_string< _CharT, _Traits, _Alloc >::size().

template<typename _CharT, typename _Traits = char_traits<_CharT>>

int_type std::basic_streambuf< _CharT, _Traits >::sungetc ( )

inlineinherited

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 )

inlineprotectedvirtualinherited

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 ( )

protectedvirtualinherited

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 ( )

inlineprotectedvirtualinherited

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<class _CharT , class _Traits , class _Alloc >

basic_stringbuf< _CharT, _Traits, _Alloc >::int_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow ( )

protectedvirtual

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 131 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
	)

protectedvirtualinherited

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
	)

protectedvirtualinherited

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().