std::basic_stringbuf(3)

NAME
std::basic_stringbuf - The actual work of input and output (for std::string).

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.).

SYNOPSIS

Inherits 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 (const __string_type &__str, ios_base::openmode __mode=ios_base::in|ios_base::out)
basic_stringbuf (ios_base::openmode __mode=ios_base::in|ios_base::out)
streamsize in_avail ()
int_type sbumpc ()
int_type sgetc ()
streamsize sgetn (char_type *__s, streamsize __n)
int_type snextc ()
int_type sputbackc (char_type __c)
int_type sputc (char_type __c)
streamsize sputn (const char_type *__s, streamsize __n)
void stossc ()
void str (const __string_type &__s)
__string_type str () const
int_type sungetc ()

  Protected Member Functions
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 &)
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 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 * egptr () const
char_type * gptr () const

char_type * epptr () const
char_type * pbase () const
char_type * pptr () const

  Protected Attributes
ios_base::openmode _M_mode
__string_type _M_string

  Friends
__gnu_cxx::__enable_if< __is_char< _CharT2 >::__value, _CharT2 * >::__type __copy_move_a2 (istreambuf_iterator< _CharT2 >, istreambuf_iterator< _CharT2 >, _CharT2 *)
streamsize __copy_streambufs_eof (__streambuf_type *, __streambuf_type *, bool &)
class basic_ios< char_type, traits_type >
class basic_istream< char_type, traits_type >
class basic_ostream< char_type, traits_type >
__gnu_cxx::__enable_if< __is_char< _CharT2 >::__value, istreambuf_iterator< _CharT2 > >::__type find (istreambuf_iterator< _CharT2 >, istreambuf_iterator< _CharT2 >, const _CharT2 &)
basic_istream< _CharT2, _Traits2 > & getline (basic_istream< _CharT2, _Traits2 > &, basic_string< _CharT2, _Traits2, _Alloc > &, _CharT2)
class istreambuf_iterator< char_type, traits_type >
basic_istream< _CharT2, _Traits2 > & operator>> (basic_istream< _CharT2, _Traits2 > &, basic_string< _CharT2, _Traits2, _Alloc > &)
basic_istream< _CharT2, _Traits2 > & operator>> (basic_istream< _CharT2, _Traits2 > &, _CharT2 *)
class ostreambuf_iterator< char_type, traits_type >
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
locale getloc () const
locale pubimbue (const locale &__loc)
pos_type pubseekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in|ios_base::out)
pos_type pubseekpos (pos_type __sp, ios_base::openmode __mode=ios_base::in|ios_base::out)
__streambuf_type * pubsetbuf (char_type *__s, streamsize __n)
int pubsync ()

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).

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 63 of file sstream.

Member Typedef Documentation

  template<typename _CharT, typename _Traits, typename _Alloc> typedef basic_streambuf<char_type, traits_type> std::basic_stringbuf< _CharT, _Traits, _Alloc >::__streambuf_type

This is a non-standard type.

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

Definition at line 76 of file sstream.

  template<typename _CharT, typename _Traits, typename _Alloc> typedef _CharT std::basic_stringbuf< _CharT, _Traits, _Alloc >::char_type

These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.

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

Definition at line 67 of file sstream.

  template<typename _CharT, typename _Traits, typename _Alloc> typedef traits_type::int_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::int_type

These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.

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

Definition at line 72 of file sstream.

  template<typename _CharT, typename _Traits, typename _Alloc> typedef traits_type::off_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::off_type

These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.

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

Definition at line 74 of file sstream.

  template<typename _CharT, typename _Traits, typename _Alloc> typedef traits_type::pos_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::pos_type

These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.

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

Definition at line 73 of file sstream.

  template<typename _CharT, typename _Traits, typename _Alloc> typedef _Traits std::basic_stringbuf< _CharT, _Traits, _Alloc >::traits_type

These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.

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

Definition at line 68 of file sstream.

Constructor & Destructor Documentation

  template<typename _CharT, typename _Traits, typename _Alloc> std::basic_stringbuf< _CharT, _Traits, _Alloc >::basic_stringbuf (ios_base::openmode __mode = ios_base::in | ios_base::out) [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 97 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 110 of file sstream.

Member Function Documentation

  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 463 of file streambuf.

Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

  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 469 of file streambuf.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

  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 516 of file streambuf.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow().

  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 479 of file streambuf.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

  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 226 of file streambuf.

  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 466 of file streambuf.

Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

  virtual void std::basic_streambuf< _CharT , _Traits >::imbue (const locale &) [inline, protected, virtual, inherited]

Changes translations.

Parameters:
    loc A new locale.

Translations done during I/O which depend on the current locale are changed by this call. The standard adds, 'Between invocations of this function a class derived from streambuf can safely cache results of calls to locale functions and to members of facets so obtained.'

Note:
    Base class version does nothing.

Reimplemented in std::basic_filebuf< _CharT, _Traits >, and std::basic_filebuf< _CharT, _Traits >.

Definition at line 557 of file streambuf.

  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 266 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 = traits_type::eof()) [inline, protected, virtual]

Consumes data from the buffer; writes to the controlled sequence.

Parameters:
    c An additional character to consume.

Returns:
    eof() to indicate failure, something else (usually c, or not_eof())

Informally, this function is called when the output buffer is full (or does not exist, as buffering need not actually be done). If a buffer exists, it is 'consumed', with 'some effect' on the controlled sequence. (Typically, the buffer is written out to the sequence verbatim.) In either case, the character c is also written out, if c is not eof().

For a formal definition of this function, see a good text such as Langer & Kreft, or [27.5.2.4.5]/3-7.

A functioning output streambuf can be created by overriding only this function (no buffer area will be used).

Note:
    Base class version does nothing, returns eof().

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

Definition at line 85 of file sstream.tcc.

References std::basic_stringbuf< _CharT, _Traits, _Alloc >::_M_mode, std::basic_string< _CharT, _Traits, _Alloc >::assign(), std::basic_string< _CharT, _Traits, _Alloc >::capacity(), std::basic_string< _CharT, _Traits, _Alloc >::data(), std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::epptr(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::max(), std::basic_string< _CharT, _Traits, _Alloc >::max_size(), std::min(), std::ios_base::out, std::basic_streambuf< _CharT, _Traits >::pbase(), std::basic_streambuf< _CharT, _Traits >::pbump(), std::basic_streambuf< _CharT, _Traits >::pptr(), std::basic_string< _CharT, _Traits, _Alloc >::push_back(), std::basic_string< _CharT, _Traits, _Alloc >::reserve(), and std::basic_string< _CharT, _Traits, _Alloc >::swap().

  template<class _CharT , class _Traits , class _Alloc > basic_stringbuf< _CharT, _Traits, _Alloc >::int_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::pbackfail (int_type = traits_type::eof()) [inline, protected, virtual]

Tries to back up the input sequence.

Parameters:
    c The character to be inserted back into the sequence.

Returns:
    eof() on failure, 'some other value' on success

Postcondition:
    The constraints of gptr(), eback(), and pptr() are the same as for underflow().

Note:
    Base class version does nothing, returns eof().

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

Definition at line 51 of file sstream.tcc.

  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 510 of file streambuf.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos().

  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 526 of file streambuf.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos().

  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 513 of file streambuf.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos().

  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 209 of file streambuf.

  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]

Current locale setting.

Definition at line 243 of file streambuf.

  pos_type std::basic_streambuf< _CharT , _Traits >::pubseekpos (pos_type __sp, ios_base::openmode __mode = ios_base::in | ios_base::out) [inline, inherited]

Current locale setting.

Definition at line 248 of file streambuf.

  __streambuf_type* std::basic_streambuf< _CharT , _Traits >::pubsetbuf (char_type * __s, streamsize __n) [inline, inherited]

Entry points for derived buffer functions.

The public versions of pubfoo dispatch to the protected derived foo member functions, passing the arguments (if any) and returning the result unchanged.

Definition at line 239 of file streambuf.

  int std::basic_streambuf< _CharT , _Traits >::pubsync () [inline, inherited]

Current locale setting.

Definition at line 253 of file streambuf.

  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 298 of file streambuf.

  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) [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 from std::basic_streambuf< _CharT, _Traits >.

Definition at line 154 of file sstream.tcc.

References std::basic_stringbuf< _CharT, _Traits, _Alloc >::_M_mode, std::ios_base::cur, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::ios_base::end, std::basic_streambuf< _CharT, _Traits >::gbump(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::ios_base::in, std::ios_base::out, std::basic_streambuf< _CharT, _Traits >::pbase(), std::basic_streambuf< _CharT, _Traits >::pbump(), and std::basic_streambuf< _CharT, _Traits >::pptr().

  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) [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 from std::basic_streambuf< _CharT, _Traits >.

Definition at line 201 of file sstream.tcc.

References std::basic_stringbuf< _CharT, _Traits, _Alloc >::_M_mode, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gbump(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::ios_base::in, std::ios_base::out, std::basic_streambuf< _CharT, _Traits >::pbase(), std::basic_streambuf< _CharT, _Traits >::pbump(), and std::basic_streambuf< _CharT, _Traits >::pptr().

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

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

Definition at line 201 of file sstream.

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

  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 490 of file streambuf.

  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 536 of file streambuf.

  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 320 of file streambuf.

  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 339 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.

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 169 of file sstream.

  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 280 of file streambuf.

  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 353 of file streambuf.

  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 405 of file streambuf.

  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 431 of file streambuf.

  void std::basic_streambuf< _CharT , _Traits >::stossc () [inline, inherited]

Tosses a character.

Advances the read pointer, ignoring the character that would have been read.

See http://gcc.gnu.org/ml/libstdc++/2002-05/msg00168.html

Definition at line 763 of file streambuf.

  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 149 of file sstream.

References 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, 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.

Definition at line 125 of file sstream.

  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 378 of file streambuf.

  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::basic_filebuf< _CharT, _Traits >, __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >, and std::basic_filebuf< _CharT, _Traits >.

Definition at line 608 of file streambuf.

  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 681 of file streambuf.

  template<class _CharT , class _Traits , class _Alloc > basic_stringbuf< _CharT, _Traits, _Alloc >::int_type std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow () [inline, protected, virtual]

Fetches more data from the controlled sequence.

Returns:
    The first character from the pending sequence.

Informally, this function is called when the input buffer is exhausted (or does not exist, as buffering need not actually be done). If a buffer exists, it is 'refilled'. In either case, the next available character is returned, or traits::eof() to indicate a null pending sequence.

For a formal definition of the pending sequence, see a good text such as Langer & Kreft, or [27.5.2.4.3]/7-14.

A functioning input streambuf can be created by overriding only this function (no buffer area will be used). For an example, see http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25.html

Note:
    Base class version does nothing, returns eof().

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

Definition at line 136 of file sstream.tcc.

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.

  virtual 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 >, __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >, and std::basic_filebuf< _CharT, _Traits >.

  virtual 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 >, __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >, and std::basic_filebuf< _CharT, _Traits >.

Member Data Documentation

  locale std::basic_streambuf< _CharT , _Traits >::_M_buf_locale [protected, inherited]

Current locale setting.

Definition at line 192 of file streambuf.

Referenced by std::basic_filebuf< _CharT, _Traits >::basic_filebuf().

  char_type* std::basic_streambuf< _CharT , _Traits >::_M_in_beg [protected, inherited]

This is based on _IO_FILE, just reordered to be more consistent, and is intended to be the most minimal abstraction for an internal buffer.

•   get == input == read

•   put == output == write

Definition at line 184 of file streambuf.

  char_type* std::basic_streambuf< _CharT , _Traits >::_M_in_cur [protected, inherited]

Current locale setting.

Definition at line 185 of file streambuf.

  char_type* std::basic_streambuf< _CharT , _Traits >::_M_in_end [protected, inherited]

Current locale setting.

Definition at line 186 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 82 of file sstream.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow().

  char_type* std::basic_streambuf< _CharT , _Traits >::_M_out_beg [protected, inherited]

Current locale setting.

Definition at line 187 of file streambuf.

  char_type* std::basic_streambuf< _CharT , _Traits >::_M_out_cur [protected, inherited]

Current locale setting.

Definition at line 188 of file streambuf.

  char_type* std::basic_streambuf< _CharT , _Traits >::_M_out_end [protected, inherited]

Current locale setting.

Definition at line 189 of file streambuf.

Author

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