Public Types | |
typedef enc_char_traits< CharT > | traits_type |
typedef traits_type::state_type | state_type |
typedef traits_type::pos_type | pos_type |
typedef CharT | char_type |
typedef traits_type::int_type | int_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 |
Public Member Functions | |
enc_filebuf (state_type &state) | |
basic_filebuf () | |
Does not open any files. | |
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. | |
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 | |
void | M_create_pback () |
void | M_destroy_pback () throw () |
virtual streamsize | showmanyc () |
Investigating the data available. | |
virtual int_type | underflow () |
Fetches more data from the controlled sequence. | |
virtual int_type | pbackfail (int_type c=enc_char_traits< CharT >::eof()) |
Tries to back up the input sequence. | |
virtual int_type | overflow (int_type c=enc_char_traits< CharT >::eof()) |
Consumes data from the buffer; writes to the controlled sequence. | |
virtual streambuf_type * | setbuf (char_type *s, streamsize n) |
Manipulates the buffer. | |
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, 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_set_buffer (streamsize __off) |
basic_streambuf () | |
Base constructor. | |
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 int_type | uflow () |
Fetches more data from the controlled sequence. | |
Protected Attributes | |
c_lock | M_lock |
__file_type | M_file |
ios_base::openmode | M_mode |
state_type | M_state_beg |
state_type | M_state_cur |
state_type | M_state_last |
char_type * | M_buf |
size_t | M_buf_size |
bool | M_buf_allocated |
bool | M_reading |
bool | M_writing |
char_type | M_pback |
char_type * | M_pback_cur_save |
char_type * | M_pback_end_save |
bool | M_pback_init |
const codecvt_type * | M_codecvt |
char * | M_ext_buf |
streamsize | M_ext_buf_size |
const char * | M_ext_next |
char * | M_ext_end |
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 | M_buf_locale |
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 46 of file enc_filebuf.h.
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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, enc_char_traits< CharT > >. |
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Does not open any files. The default constructor initializes the parent class using its own default ctor. |
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Base constructor. Only called from derived constructors, and sets up all the buffer data to zero, including the pointers described in the basic_streambuf class description. Note that, as a result,
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Closes the currently associated file.
If a "put buffer area" exists, If any operations fail, this function also fails. |
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Access to the get area. These functions are only available to other protected functions, including derived classes.
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Moving the read position.
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Locale access.
loc is returned. Otherwise the global locale in effect at the time of construction is returned.
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Changes translations.
Reimplemented from std::basic_streambuf< CharT, enc_char_traits< CharT > >. |
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Looking ahead into the stream.
showmanyc() .
Definition at line 255 of file streambuf. References std::basic_streambuf< CharT, Traits >::egptr(), std::basic_streambuf< CharT, Traits >::gptr(), and std::basic_streambuf< CharT, Traits >::showmanyc(). |
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Returns true if the external file is open.
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Opens an external file.
[Table 92 gives the relation between openmode combinations and the equivalent fopen() flags, but the table has not been copied yet.] |
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Consumes data from the buffer; writes to the controlled sequence.
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, enc_char_traits< CharT > >. |
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Tries to back up the input sequence.
Reimplemented from std::basic_streambuf< CharT, enc_char_traits< CharT > >. |
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Access to the put area. These functions are only available to other protected functions, including derived classes.
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Moving the write position.
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Entry point for imbue().
Definition at line 198 of file streambuf. References std::basic_streambuf< CharT, Traits >::imbue(). |
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Entry points for derived buffer functions.
The public versions of Definition at line 228 of file streambuf. References std::basic_streambuf< CharT, Traits >::setbuf(). |
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Getting the next character.
uflow() .
Definition at line 287 of file streambuf. References std::basic_streambuf< CharT, Traits >::egptr(), std::basic_streambuf< CharT, Traits >::gbump(), and std::basic_streambuf< CharT, Traits >::uflow(). |
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Alters the stream positions. Each derived class provides its own appropriate behavior.
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Alters the stream positions. Each derived class provides its own appropriate behavior.
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Manipulates the buffer.
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, enc_char_traits< CharT > >. |
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Setting the three read area pointers.
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Setting the three write area pointers.
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Getting the next character.
underflow() . Does not move the read position after fetching the character.
Definition at line 309 of file streambuf. References std::basic_streambuf< CharT, Traits >::egptr(), and std::basic_streambuf< CharT, Traits >::underflow(). |
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Entry point for xsgetn.
Definition at line 328 of file streambuf. References std::basic_streambuf< CharT, Traits >::xsgetn(). |
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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
Reimplemented from std::basic_streambuf< CharT, enc_char_traits< CharT > >. |
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Getting the next character.
sbumpc() , and if that function returns traits::eof() , so does this function. Otherwise, sgetc() .
Definition at line 269 of file streambuf. References std::basic_streambuf< CharT, Traits >::sgetc(). |
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Pushing characters back into the input stream.
Definition at line 342 of file streambuf. References std::basic_streambuf< CharT, Traits >::eback(), std::basic_streambuf< CharT, Traits >::gbump(), std::basic_streambuf< CharT, Traits >::gptr(), and std::basic_streambuf< CharT, Traits >::pbackfail(). |
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Entry point for all single-character 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 Definition at line 394 of file streambuf. References std::basic_streambuf< CharT, Traits >::epptr(), std::basic_streambuf< CharT, Traits >::overflow(), std::basic_streambuf< CharT, Traits >::pbump(), and std::basic_streambuf< CharT, Traits >::pptr(). |
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Entry point for all single-character 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 420 of file streambuf. References std::basic_streambuf< CharT, Traits >::xsputn(). |
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Moving backwards in the input stream.
Definition at line 367 of file streambuf. References std::basic_streambuf< CharT, Traits >::gbump(), std::basic_streambuf< CharT, Traits >::gptr(), and std::basic_streambuf< CharT, Traits >::pbackfail(). |
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Synchronizes the buffer arrays with the controlled sequences.
Reimplemented from std::basic_streambuf< CharT, enc_char_traits< CharT > >. |
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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.
Definition at line 670 of file streambuf. References std::basic_streambuf< CharT, Traits >::gbump(). |
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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, enc_char_traits< CharT > >. |
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Multiple character extraction.
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, enc_char_traits< CharT > >. |
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Multiple character insertion.
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, enc_char_traits< CharT > >. |