char_type | M_pback [S_pback_size] |
char_type * | M_pback_cur_save |
char_type * | M_pback_end_save |
bool | M_pback_init |
static const size_t | S_pback_size |
Public Types | |
typedef enc_char_traits< CharT >::state_type | state_type |
typedef CharT | char_type |
typedef Traits | traits_type |
typedef traits_type::int_type | int_type |
typedef traits_type::pos_type | pos_type |
typedef traits_type::off_type | off_type |
typedef basic_streambuf< char_type, traits_type > | streambuf_type |
typedef basic_filebuf< char_type, traits_type > | __filebuf_type |
typedef __basic_file< char > | __file_type |
typedef codecvt< char_type, char, state_type > | codecvt_type |
typedef ctype< char_type > | ctype_type |
Public Member Functions | |
enc_filebuf (state_type &state) | |
bool | is_open () const throw () |
Returns true if the external file is open. | |
__filebuf_type * | open (const char *s, ios_base::openmode __mode) |
Opens an external file. | |
__filebuf_type * | close () throw () |
Closes the currently associated file. | |
template<> | |
basic_filebuf< char >::int_type | M_underflow_common (bool __bump) |
locale | pubimbue (const locale &__loc) |
Entry point for imbue(). | |
locale | getloc () const |
Locale access. | |
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. | |
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) |
Entry points for derived buffer functions. | |
pos_type | pubseekpos (pos_type sp, ios_base::openmode __mode=ios_base::in|ios_base::out) |
Entry points for derived buffer functions. | |
int | pubsync () |
Entry points for derived buffer functions. | |
Protected Member Functions | |
void | M_allocate_internal_buffer () |
void | M_destroy_internal_buffer () throw () |
virtual streamsize | showmanyc () |
Investigating the data available. | |
virtual int_type | underflow () |
Fetches more data from the controlled sequence. | |
virtual int_type | uflow () |
Fetches more data from the controlled sequence. | |
virtual int_type | pbackfail (int_type c=Traits::eof()) |
Tries to back up the input sequence. | |
virtual int_type | overflow (int_type c=Traits::eof()) |
Consumes data from the buffer; writes to the controlled sequence. | |
int_type | M_really_overflow (int_type c=Traits::eof()) |
void | M_convert_to_external (char_type *, streamsize, streamsize &, streamsize &) |
virtual streambuf_type * | setbuf (char_type *s, streamsize n) |
Manipulates the buffer. | |
virtual pos_type | seekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in|ios_base::out) |
virtual pos_type | seekoff (off_type, ios_base::seekdir, ios_base::openmode=ios_base::in|ios_base::out) |
Alters the stream positions. | |
virtual pos_type | seekpos (pos_type position, ios_base::openmode __mode=ios_base::in|ios_base::out) |
virtual pos_type | seekpos (pos_type, 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 void | imbue (const locale &__loc) |
Changes translations. | |
virtual streamsize | xsgetn (char_type *s, streamsize n) |
Multiple character extraction. | |
virtual streamsize | xsputn (const char_type *s, streamsize n) |
Multiple character insertion. | |
void | M_output_unshift () |
void | M_set_indeterminate (void) |
void | M_set_determinate (off_type __off) |
bool | M_is_indeterminate (void) |
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 () |
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. | |
void | pbump (int n) |
Moving the write position. | |
void | setp (char_type *__pbeg, char_type *__pend) |
Setting the three write area pointers. | |
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 | |
c_lock | M_lock |
__file_type | M_file |
state_type | M_state_cur |
state_type | M_state_beg |
bool | M_buf_allocated |
bool | M_last_overflowed |
char_type * | M_filepos |
char_type * | M_buf |
size_t | M_buf_size |
size_t | M_buf_size_opt |
bool | M_buf_unified |
ios_base::openmode | M_mode |
locale | M_buf_locale |
bool | M_buf_locale_init |
fpos< state_type > | M_pos |
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 |
Friends | |
class | ios_base |
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 44 of file enc_filebuf.h.
typedef CharT std::basic_filebuf< CharT, Traits >::char_type [inherited] |
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 >.
Reimplemented in __gnu_cxx::stdio_filebuf< CharT, Traits >.
typedef traits_type::int_type std::basic_filebuf< CharT, Traits >::int_type [inherited] |
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 >.
Reimplemented in __gnu_cxx::stdio_filebuf< CharT, Traits >.
typedef traits_type::off_type std::basic_filebuf< CharT, Traits >::off_type [inherited] |
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 >.
Reimplemented in __gnu_cxx::stdio_filebuf< CharT, Traits >.
typedef traits_type::pos_type std::basic_filebuf< CharT, Traits >::pos_type [inherited] |
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 >.
Reimplemented in __gnu_cxx::stdio_filebuf< CharT, Traits >.
typedef Traits std::basic_filebuf< CharT, Traits >::traits_type [inherited] |
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 >.
Reimplemented in __gnu_cxx::stdio_filebuf< CharT, Traits >.
basic_filebuf< CharT, Traits >::__filebuf_type * std::basic_filebuf< CharT, Traits >::close | ( | ) | throw () [inherited] |
Closes the currently associated file.
this
on success, NULL on failure
If a "put buffer area" exists, overflow(eof)
is called to flush all the characters. The file is then closed.
If any operations fail, this function also fails.
Definition at line 114 of file fstream.tcc.
Referenced by std::basic_filebuf< CharT, __gnu_cxx::enc_char_traits< CharT > >::~basic_filebuf().
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.
Definition at line 599 of file streambuf.
Referenced by std::strstreambuf::overflow(), std::strstreambuf::pbackfail(), std::strstreambuf::seekoff(), std::basic_stringbuf< CharT, Traits, Alloc >::seekpos(), std::strstreambuf::str(), std::strstreambuf::underflow(), and std::strstreambuf::~strstreambuf().
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.
Definition at line 605 of file streambuf.
Referenced by std::basic_streambuf< char, Traits >::in_avail(), std::strstreambuf::seekoff(), std::basic_stringbuf< CharT, Traits, Alloc >::seekoff(), std::basic_stringbuf< CharT, Traits, Alloc >::seekpos(), and std::strstreambuf::underflow().
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.
Definition at line 654 of file streambuf.
Referenced by std::strstreambuf::overflow(), std::strstreambuf::seekoff(), and std::basic_stringbuf< CharT, Traits, Alloc >::seekoff().
void std::basic_streambuf< CharT, Traits >::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 std::strstreambuf::pbackfail().
locale std::basic_streambuf< CharT, Traits >::getloc | ( | ) | const [inline, inherited] |
Locale access.
loc
is returned. Otherwise the global locale in effect at the time of construction is returned.
Definition at line 395 of file streambuf.
Referenced by std::basic_filebuf< CharT, Traits >::M_convert_to_external(), and std::basic_filebuf< CharT, Traits >::showmanyc().
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.
Definition at line 602 of file streambuf.
Referenced by std::basic_streambuf< char, Traits >::in_avail(), std::strstreambuf::overflow(), std::strstreambuf::pbackfail(), std::basic_streambuf< CharT, Traits >::sbumpc(), std::strstreambuf::seekoff(), std::basic_stringbuf< CharT, Traits, Alloc >::seekoff(), std::strstreambuf::underflow(), and std::basic_stringbuf< CharT, Traits, Alloc >::underflow().
void std::basic_filebuf< CharT, Traits >::imbue | ( | const locale & | __loc | ) | [protected, virtual, inherited] |
Changes translations.
loc | A new locale. |
Reimplemented from std::basic_streambuf< CharT, Traits >.
Definition at line 509 of file fstream.tcc.
streamsize std::basic_streambuf< CharT, Traits >::in_avail | ( | ) | [inline, inherited] |
Looking ahead into the stream.
showmanyc()
.
bool std::basic_filebuf< CharT, Traits >::is_open | ( | ) | const throw () [inline, inherited] |
basic_filebuf< CharT, Traits >::__filebuf_type * std::basic_filebuf< CharT, Traits >::open | ( | const char * | s, | |
ios_base::openmode | __mode | |||
) | [inherited] |
Opens an external file.
s | The name of the file. | |
mode | The open mode flags. |
this
on success, NULL on failure[Table 92 gives the relation between openmode combinations and the equivalent fopen() flags, but the table has not been copied yet.]
Definition at line 83 of file fstream.tcc.
References std::ios_base::ate, and std::ios_base::end.
basic_filebuf< CharT, Traits >::int_type std::basic_filebuf< CharT, Traits >::overflow | ( | int_type | c = Traits::eof() |
) | [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).
Reimplemented from std::basic_streambuf< CharT, Traits >.
Definition at line 253 of file fstream.tcc.
References std::ios_base::out.
basic_filebuf< CharT, Traits >::int_type std::basic_filebuf< CharT, Traits >::pbackfail | ( | int_type | c = Traits::eof() |
) | [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()
.Reimplemented from std::basic_streambuf< CharT, Traits >.
Definition at line 180 of file fstream.tcc.
References std::ios_base::cur, std::ios_base::in, and std::ios_base::out.
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.
Definition at line 648 of file streambuf.
Referenced by std::strstreambuf::overflow(), std::strstreambuf::pcount(), std::strstreambuf::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.
n | The delta by which to move. |
Definition at line 664 of file streambuf.
Referenced by std::strstreambuf::overflow(), and std::strstreambuf::seekoff().
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.
Definition at line 651 of file streambuf.
Referenced by std::strstreambuf::overflow(), std::strstreambuf::pcount(), std::strstreambuf::seekoff(), std::basic_stringbuf< CharT, Traits, Alloc >::seekoff(), and std::strstreambuf::underflow().
locale std::basic_streambuf< CharT, Traits >::pubimbue | ( | const locale & | __loc | ) | [inline, inherited] |
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] |
pos_type std::basic_streambuf< CharT, Traits >::pubseekpos | ( | pos_type | sp, | |
ios_base::openmode | __mode = ios_base::in | ios_base::out | |||
) | [inline, inherited] |
streambuf_type* std::basic_streambuf< CharT, Traits >::pubsetbuf | ( | char_type * | s, | |
streamsize | n | |||
) | [inline, inherited] |
int std::basic_streambuf< CharT, Traits >::pubsync | ( | ) | [inline, inherited] |
basic_streambuf< CharT, Traits >::int_type std::basic_streambuf< CharT, Traits >::sbumpc | ( | ) | [inherited] |
Getting the next character.
uflow()
.
Definition at line 49 of file streambuf.tcc.
References std::basic_streambuf< CharT, Traits >::gptr(), and std::basic_streambuf< CharT, Traits >::uflow().
Referenced by std::operator>>().
virtual pos_type std::basic_streambuf< CharT, Traits >::seekoff | ( | off_type | , | |
ios_base::seekdir | , | |||
ios_base::openmode | = ios_base::in | ios_base::out | |||
) | [inline, protected, virtual, inherited] |
Alters the stream positions.
Each derived class provides its own appropriate behavior.
pos_type
that represents an invalid stream position. Definition at line 723 of file streambuf.
Referenced by std::basic_streambuf< char, Traits >::pubseekoff().
virtual pos_type std::basic_streambuf< CharT, Traits >::seekpos | ( | pos_type | , | |
ios_base::openmode | = ios_base::in | ios_base::out | |||
) | [inline, protected, virtual, inherited] |
Alters the stream positions.
Each derived class provides its own appropriate behavior.
pos_type
that represents an invalid stream position. Definition at line 735 of file streambuf.
Referenced by std::basic_streambuf< char, Traits >::pubseekpos().
basic_filebuf< CharT, Traits >::streambuf_type * std::basic_filebuf< CharT, Traits >::setbuf | ( | char_type * | s, | |
streamsize | n | |||
) | [protected, virtual, inherited] |
Manipulates the buffer.
s | Pointer to a buffer area. | |
n | Size of s. |
this
s
is used as a buffer; see http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2 for more.
Reimplemented from std::basic_streambuf< CharT, Traits >.
Definition at line 405 of file fstream.tcc.
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.
gbeg | A pointer. | |
gnext | A pointer. | |
gend | A pointer. |
Definition at line 626 of file streambuf.
Referenced by std::basic_filebuf< CharT, Traits >::M_destroy_internal_buffer(), std::basic_streambuf< char, Traits >::M_pback_create(), std::basic_streambuf< char, Traits >::M_pback_destroy(), std::basic_stringbuf< CharT, Traits, Alloc >::M_really_sync(), std::basic_filebuf< CharT, __gnu_cxx::enc_char_traits< CharT > >::M_set_determinate(), std::basic_filebuf< CharT, __gnu_cxx::enc_char_traits< CharT > >::M_set_indeterminate(), std::strstreambuf::M_setup(), std::strstreambuf::overflow(), std::strstreambuf::seekoff(), std::strstreambuf::strstreambuf(), and std::strstreambuf::underflow().
void std::basic_streambuf< CharT, Traits >::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 std::basic_filebuf< CharT, Traits >::M_destroy_internal_buffer(), std::basic_stringbuf< CharT, Traits, Alloc >::M_really_sync(), std::basic_filebuf< CharT, __gnu_cxx::enc_char_traits< CharT > >::M_set_determinate(), std::basic_filebuf< CharT, __gnu_cxx::enc_char_traits< CharT > >::M_set_indeterminate(), std::strstreambuf::M_setup(), std::strstreambuf::overflow(), std::strstreambuf::seekoff(), and std::strstreambuf::strstreambuf().
int_type std::basic_streambuf< CharT, Traits >::sgetc | ( | ) | [inline, inherited] |
Getting the next character.
underflow()
. Does not move the read position after fetching the character.
Definition at line 489 of file streambuf.
Referenced by std::copy_streambufs().
streamsize std::basic_streambuf< CharT, Traits >::sgetn | ( | char_type * | s, | |
streamsize | n | |||
) | [inline, inherited] |
streamsize std::basic_filebuf< CharT, Traits >::showmanyc | ( | ) | [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".
Reimplemented from std::basic_streambuf< CharT, Traits >.
Definition at line 159 of file fstream.tcc.
References std::basic_streambuf< CharT, Traits >::getloc(), and std::ios_base::in.
int_type std::basic_streambuf< CharT, Traits >::snextc | ( | ) | [inline, inherited] |
Getting the next character.
sbumpc()
, and if that function returns traits::eof()
, so does this function. Otherwise, sgetc()
.
Definition at line 462 of file streambuf.
Referenced by std::copy_streambufs().
basic_streambuf< CharT, Traits >::int_type std::basic_streambuf< CharT, Traits >::sputbackc | ( | char_type | c | ) | [inherited] |
Pushing characters back into the input stream.
c | The character to push back. |
Definition at line 66 of file streambuf.tcc.
References std::basic_streambuf< CharT, Traits >::pbackfail().
Referenced by std::operator>>().
basic_streambuf< CharT, Traits >::int_type std::basic_streambuf< CharT, Traits >::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)
.
Definition at line 104 of file streambuf.tcc.
References std::basic_streambuf< CharT, Traits >::overflow().
Referenced by std::copy_streambufs(), and std::basic_stringbuf< CharT, Traits, Alloc >::overflow().
streamsize std::basic_streambuf< CharT, Traits >::sputn | ( | const char_type * | s, | |
streamsize | n | |||
) | [inline, inherited] |
Entry point for all single-character output functions.
s | A buffer read area. | |
n | A count. |
Returns xsputn(s,n). The effect is to write s[0] through s[n-1] to the output sequence, if possible.
Definition at line 564 of file streambuf.
Referenced by std::copy_streambufs().
basic_streambuf< CharT, Traits >::int_type std::basic_streambuf< CharT, Traits >::sungetc | ( | ) | [inherited] |
Moving backwards in the input stream.
Definition at line 83 of file streambuf.tcc.
References std::basic_streambuf< CharT, Traits >::pbackfail().
virtual int std::basic_filebuf< CharT, Traits >::sync | ( | ) | [inline, protected, virtual, inherited] |
Synchronizes the buffer arrays with the controlled sequences.
Reimplemented from std::basic_streambuf< CharT, Traits >.
Definition at line 311 of file fstream.
Referenced by std::basic_filebuf< CharT, Traits >::seekoff().
basic_filebuf< CharT, Traits >::int_type std::basic_filebuf< CharT, Traits >::uflow | ( | ) | [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.
Reimplemented from std::basic_streambuf< CharT, Traits >.
basic_filebuf< CharT, Traits >::int_type std::basic_filebuf< CharT, Traits >::underflow | ( | ) | [protected, virtual, inherited] |
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< CharT, Traits >.
virtual streamsize std::basic_filebuf< CharT, Traits >::xsgetn | ( | char_type * | s, | |
streamsize | n | |||
) | [inline, 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.
Reimplemented from std::basic_streambuf< CharT, Traits >.
virtual streamsize std::basic_filebuf< CharT, Traits >::xsputn | ( | const char_type * | s, | |
streamsize | n | |||
) | [inline, 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.
Reimplemented from std::basic_streambuf< CharT, Traits >.