Public Types | |
typedef char_traits< char > | Traits |
typedef basic_streambuf< char, Traits > | Base |
typedef char | char_type |
typedef char_traits< char > | traits_type |
typedef traits_type::int_type | int_type |
typedef traits_type::pos_type | pos_type |
typedef traits_type::off_type | off_type |
typedef ctype< char_type > | ctype_type |
typedef basic_streambuf< char_type, traits_type > | streambuf_type |
typedef traits_type::state_type | state_type |
Public Member Functions | |
strstreambuf (streamsize initial_capacity=0) | |
strstreambuf (void *(*alloc)(size_t), void(*__free)(void *)) | |
strstreambuf (char *__get, streamsize n, char *__put=0) | |
strstreambuf (signed char *__get, streamsize n, signed char *__put=0) | |
strstreambuf (unsigned char *__get, streamsize n, unsigned char *__put=0) | |
strstreambuf (const char *__get, streamsize n) | |
strstreambuf (const signed char *__get, streamsize n) | |
strstreambuf (const unsigned char *__get, streamsize n) | |
virtual | ~strstreambuf () |
void | freeze (bool=true) |
char * | str () |
int | pcount () const |
locale | pubimbue (const locale &__loc) |
Entry point for imbue(). | |
locale | getloc () const |
Locale access. | |
streambuf_type * | 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) |
pos_type | pubseekpos (pos_type sp, ios_base::openmode __mode=ios_base::in|ios_base::out) |
int | pubsync () |
streamsize | in_avail () |
Looking ahead into the stream. | |
int_type | snextc () |
Getting the next character. | |
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 | sputbackc (char_type c) |
Pushing characters back into the input stream. | |
int_type | sungetc () |
Moving backwards in 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. | |
Protected Member Functions | |
virtual int_type | overflow (int_type c=Traits::eof()) |
virtual int_type | pbackfail (int_type c=Traits::eof()) |
virtual int_type | underflow () |
Fetches more data from the controlled sequence. | |
virtual Base * | setbuf (char *__buf, streamsize n) |
Maniuplates the buffer. | |
virtual pos_type | seekoff (off_type __off, ios_base::seekdir __dir, ios_base::openmode __mode=ios_base::in|ios_base::out) |
virtual pos_type | seekpos (pos_type position, ios_base::openmode __mode=ios_base::in|ios_base::out) |
Alters the stream positions. | |
void | M_pback_create () |
void | M_pback_destroy () throw () |
void | M_in_cur_move (off_type n) |
void | M_out_cur_move (off_type n) |
off_type | M_out_buf_size () |
char_type * | eback () const |
Access to the get area. | |
char_type * | gptr () const |
char_type * | egptr () const |
void | gbump (int n) |
Moving the read position. | |
void | setg (char_type *__gbeg, char_type *__gnext, char_type *__gend) |
Setting the three read area pointers. | |
char_type * | pbase () const |
Access to the put area. | |
char_type * | pptr () const |
char_type * | epptr () const |
void | pbump (int n) |
Moving the write position. | |
void | setp (char_type *__pbeg, char_type *__pend) |
Setting the three write area pointers. | |
virtual void | imbue (const locale &) |
Changes translations. | |
virtual pos_type | seekoff (off_type, ios_base::seekdir, ios_base::openmode=ios_base::in|ios_base::out) |
Alters the stream positions. | |
virtual int | sync () |
Synchronizes the buffer arrays with the controlled sequences. | |
virtual streamsize | showmanyc () |
Investigating the data available. | |
virtual streamsize | xsgetn (char_type *s, streamsize n) |
Multiple character extraction. | |
virtual int_type | uflow () |
Fetches more data from the controlled sequence. | |
virtual int_type | pbackfail (int_type=traits_type::eof()) |
Tries to back up the input sequence. | |
virtual streamsize | xsputn (const char_type *s, streamsize n) |
Multiple character insertion. | |
virtual int_type | overflow (int_type=traits_type::eof()) |
Consumes data from the buffer; writes to the controlled sequence. | |
Protected Attributes | |
char_type * | M_buf |
size_t | M_buf_size |
size_t | M_buf_size_opt |
bool | M_buf_unified |
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 |
ios_base::openmode | M_mode |
locale | M_buf_locale |
bool | M_buf_locale_init |
char_type | M_pback [S_pback_size] |
char_type * | M_pback_cur_save |
char_type * | M_pback_end_save |
bool | M_pback_init |
fpos< state_type > | M_pos |
Static Protected Attributes | |
static const size_t | S_pback_size |
Private Member Functions | |
char * | M_alloc (size_t) |
void | M_free (char *) |
void | M_setup (char *__get, char *__put, streamsize n) |
Private Attributes | |
bool | M_dynamic: 1 |
bool | M_frozen: 1 |
bool | M_constant: 1 |
Friends | |
class | basic_ios< char_type, traits_type > |
class | basic_istream< char_type, traits_type > |
class | basic_ostream< char_type, traits_type > |
class | istreambuf_iterator< char_type, traits_type > |
class | ostreambuf_iterator< char_type, traits_type > |
Definition at line 62 of file strstream.
typedef char std::basic_streambuf< char , char_traits< char > >::char_type [inherited] |
strstreambuf::int_type std::strstreambuf::underflow | ( | ) | [protected, virtual] |
Fetches more data from the controlled sequence.
traits::eof()
to indicate a null pending sequence.For a formal definiton 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++/27_io/howto.html#6
Reimplemented from std::basic_streambuf< char, char_traits< char > >.
Definition at line 213 of file strstream.cc.
References std::basic_streambuf< char, char_traits< char > >::eback(), std::basic_streambuf< char, char_traits< char > >::egptr(), std::basic_streambuf< char, char_traits< char > >::gptr(), std::basic_streambuf< char, char_traits< char > >::pptr(), and std::basic_streambuf< char, char_traits< char > >::setg().
basic_streambuf< char, char_traits< char > > * std::strstreambuf::setbuf | ( | char * | , | |
streamsize | ||||
) | [protected, virtual] |
Maniuplates the buffer.
Each derived class provides its own appropriate behavior. See the next-to-last paragraph of http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2 for more on this function.
this
. Reimplemented from std::basic_streambuf< char, char_traits< char > >.
Definition at line 225 of file strstream.cc.
strstreambuf::pos_type std::strstreambuf::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.
pos_type
that represents an invalid stream position. Reimplemented from std::basic_streambuf< char, char_traits< char > >.
Definition at line 298 of file strstream.cc.
References std::ios_base::beg, and seekoff().
locale std::basic_streambuf< char , char_traits< char > >::pubimbue | ( | const locale & | __loc | ) | [inline, inherited] |
locale std::basic_streambuf< char , char_traits< char > >::getloc | ( | ) | const [inline, inherited] |
streambuf_type* std::basic_streambuf< char , char_traits< char > >::pubsetbuf | ( | char_type * | s, | |
streamsize | n | |||
) | [inline, inherited] |
streamsize std::basic_streambuf< char , char_traits< char > >::in_avail | ( | ) | [inline, inherited] |
Looking ahead into the stream.
showmanyc()
.
int_type std::basic_streambuf< char , char_traits< char > >::snextc | ( | ) | [inline, inherited] |
int_type std::basic_streambuf< char , char_traits< char > >::sbumpc | ( | ) | [inherited] |
Getting the next character.
uflow()
.
int_type std::basic_streambuf< char , char_traits< char > >::sgetc | ( | ) | [inline, inherited] |
Getting the next character.
underflow()
. Does not move the read position after fetching the character.
streamsize std::basic_streambuf< char , char_traits< char > >::sgetn | ( | char_type * | s, | |
streamsize | n | |||
) | [inline, inherited] |
int_type std::basic_streambuf< char , char_traits< char > >::sputbackc | ( | char_type | c | ) | [inherited] |
Pushing characters back into the input stream.
c | The character to push back. |
int_type std::basic_streambuf< char , char_traits< char > >::sungetc | ( | ) | [inherited] |
Moving backwards in the input stream.
int_type std::basic_streambuf< char , char_traits< char > >::sputc | ( | char_type | c | ) | [inherited] |
Entry point for all single-character output functions.
c | A character to output. |
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)
.
streamsize std::basic_streambuf< char , char_traits< char > >::sputn | ( | const char_type * | s, | |
streamsize | n | |||
) | [inline, inherited] |
char_type* std::basic_streambuf< char , char_traits< char > >::eback | ( | ) | const [inline, protected, inherited] |
Access to the get area.
These functions are only available to other protected functions, including derived classes.
Definition at line 599 of file streambuf.
Referenced by overflow(), pbackfail(), seekoff(), str(), underflow(), and ~strstreambuf().
void std::basic_streambuf< char , char_traits< char > >::gbump | ( | int | n | ) | [inline, protected, inherited] |
Moving the read position.
n | The delta by which to move. |
Definition at line 615 of file streambuf.
Referenced by pbackfail().
void std::basic_streambuf< char , char_traits< char > >::setg | ( | char_type * | __gbeg, | |
char_type * | __gnext, | |||
char_type * | __gend | |||
) | [inline, protected, inherited] |
Setting the three read area pointers.
gbeg | A pointer. | |
gnext | A pointer. | |
gend | A pointer. |
Definition at line 626 of file streambuf.
Referenced by M_setup(), overflow(), seekoff(), strstreambuf(), and underflow().
char_type* std::basic_streambuf< char , char_traits< char > >::pbase | ( | ) | const [inline, protected, inherited] |
Access to the put area.
These functions are only available to other protected functions, including derived classes.
Definition at line 648 of file streambuf.
Referenced by overflow(), pcount(), and seekoff().
void std::basic_streambuf< char , char_traits< char > >::pbump | ( | int | n | ) | [inline, protected, inherited] |
Moving the write position.
n | The delta by which to move. |
Definition at line 664 of file streambuf.
Referenced by overflow(), and seekoff().
void std::basic_streambuf< char , char_traits< char > >::setp | ( | char_type * | __pbeg, | |
char_type * | __pend | |||
) | [inline, protected, inherited] |
Setting the three write area pointers.
pbeg | A pointer. | |
pend | A pointer. |
Definition at line 674 of file streambuf.
Referenced by M_setup(), overflow(), seekoff(), and strstreambuf().
virtual void std::basic_streambuf< char , char_traits< char > >::imbue | ( | const locale & | ) | [inline, protected, virtual, inherited] |
Changes translations.
loc | A new locale. |
virtual pos_type std::basic_streambuf< char , char_traits< char > >::seekoff | ( | off_type | , | |
ios_base::seekdir | , | |||
ios_base::openmode | = ios_base::in | ios_base::out | |||
) | [inline, protected, virtual, inherited] |
virtual int std::basic_streambuf< char , char_traits< char > >::sync | ( | void | ) | [inline, protected, virtual, inherited] |
virtual streamsize std::basic_streambuf< char , char_traits< char > >::showmanyc | ( | ) | [inline, protected, virtual, inherited] |
Investigating the data available.
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
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".
virtual streamsize std::basic_streambuf< char , char_traits< char > >::xsgetn | ( | char_type * | s, | |
streamsize | n | |||
) | [protected, virtual, inherited] |
Multiple character extraction.
s | A buffer area. | |
n | Maximum number of characters to assign. |
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.
virtual int_type std::basic_streambuf< char , char_traits< char > >::uflow | ( | ) | [inline, protected, virtual, inherited] |
Fetches more data from the controlled sequence.
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.
virtual int_type std::basic_streambuf< char , char_traits< char > >::pbackfail | ( | int_type | = traits_type::eof() |
) | [inline, protected, virtual, inherited] |
Tries to back up the input sequence.
c | The character to be inserted back into the sequence. |
gptr()
, eback()
, and pptr()
are the same as for underflow()
.virtual streamsize std::basic_streambuf< char , char_traits< char > >::xsputn | ( | const char_type * | s, | |
streamsize | n | |||
) | [protected, virtual, inherited] |
Multiple character insertion.
s | A buffer area. | |
n | Maximum number of characters to write. |
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.
virtual int_type std::basic_streambuf< char , char_traits< char > >::overflow | ( | int_type | = traits_type::eof() |
) | [inline, protected, virtual, inherited] |
Consumes data from the buffer; writes to the controlled sequence.
c | An additional character to consume. |
eof()
.For a formal definiton 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).