Inherits std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >.
typedef codecvt< char_type, char, __state_type > __codecvt_type
typedef __basic_file< char > __file_type
typedef basic_filebuf< char_type, traits_type > __filebuf_type
typedef traits_type::state_type __state_type
typedef basic_streambuf< char_type, traits_type > __streambuf_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_type::state_type state_type
typedef encoding_char_traits< _CharT > traits_type
enc_filebuf (state_type &__state)
__filebuf_type * close ()
Closes the currently associated file.
locale getloc () const
Locale access.
streamsize in_avail ()
Looking ahead into the stream.
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 * open (const std::string &__s, ios_base::openmode __mode)
Opens an external file.
locale pubimbue (const locale &__loc)
Entry point for imbue().
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 snextc ()
Getting the next character.
int_type sputbackc (char_type __c)
Pushing characters back into 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.
int_type sungetc ()
Moving backwards in the input stream.
void swap (basic_filebuf &)
basic_streambuf * 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)
Alters the stream position.
pos_type pubseekpos (pos_type __sp, ios_base::openmode __mode=ios_base::in|ios_base::out)
Alters the stream position.
int pubsync ()
Calls virtual sync function.
void __safe_gbump (streamsize __n)
void __safe_pbump (streamsize __n)
void _M_allocate_internal_buffer ()
bool _M_convert_to_external (char_type *, streamsize)
void _M_create_pback ()
void _M_destroy_internal_buffer () throw ()
void _M_destroy_pback () throw ()
int _M_get_ext_pos (__state_type &__state)
pos_type _M_seek (off_type __off, ios_base::seekdir __way, __state_type __state)
void _M_set_buffer (streamsize __off)
bool _M_terminate_output ()
void gbump (int __n)
Moving the read position.
virtual void imbue (const locale &__loc)
virtual void imbue (const locale &__loc __attribute__((__unused__)))
Changes translations.
virtual int_type overflow (int_type __c=encoding_char_traits< _CharT > ::eof())
virtual int_type overflow (int_type __c __attribute__((__unused__))=traits_type::eof())
Consumes data from the buffer; writes to the controlled sequence.
virtual int_type pbackfail (int_type __c=encoding_char_traits< _CharT > ::eof())
virtual int_type pbackfail (int_type __c __attribute__((__unused__))=traits_type::eof())
Tries to back up the input sequence.
void pbump (int __n)
Moving the write position.
virtual pos_type seekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in|ios_base::out)
Alters the stream positions.
virtual pos_type seekpos (pos_type __pos, ios_base::openmode __mode=ios_base::in|ios_base::out)
Alters the stream positions.
virtual __streambuf_type * setbuf (char_type *__s, streamsize __n)
Manipulates the buffer.
void setg (char_type *__gbeg, char_type *__gnext, char_type *__gend)
Setting the three read area pointers.
void setp (char_type *__pbeg, char_type *__pend)
Setting the three write area pointers.
virtual streamsize showmanyc ()
Investigating the data available.
void swap (basic_streambuf &__sb)
virtual int sync ()
Synchronizes the buffer arrays with the controlled sequences.
virtual int_type uflow ()
Fetches more data from the controlled sequence.
virtual int_type underflow ()
Fetches more data from the controlled sequence.
virtual streamsize xsgetn (char_type *__s, streamsize __n)
Multiple character extraction.
virtual streamsize xsputn (const char_type *__s, streamsize __n)
Multiple character insertion.
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.
char_type * _M_buf
Pointer to the beginning of internal buffer.
bool _M_buf_allocated
locale _M_buf_locale
Current locale setting.
size_t _M_buf_size
const __codecvt_type * _M_codecvt
char * _M_ext_buf
streamsize _M_ext_buf_size
char * _M_ext_end
const char * _M_ext_next
__file_type _M_file
char_type * _M_in_beg
Start of get area.
char_type * _M_in_cur
Current read area.
char_type * _M_in_end
End of get area.
__c_lock _M_lock
ios_base::openmode _M_mode
Place to stash in || out || in | out settings for current filebuf.
char_type * _M_out_beg
Start of put area.
char_type * _M_out_cur
Current put area.
char_type * _M_out_end
End of put area.
bool _M_reading
__state_type _M_state_beg
__state_type _M_state_cur
__state_type _M_state_last
bool _M_writing
char_type _M_pback
char_type * _M_pback_cur_save
char_type * _M_pback_end_save
bool _M_pback_init
Definition at line 42 of file enc_filebuf.h.
Definition at line 199 of file fstream.
Definition at line 216 of file fstream.
__off == egptr() - eback() upon underflow/uflow (read mode); __off == 0 upon overflow (write mode); __off == -1 upon open, setbuf, seekoff/pos (uncommitted mode).
NB: epptr() - pbase() == _M_buf_size - 1, since _M_buf_size reflects the actual allocated memory and the last cell is reserved for the overflow char of a full put area.
Definition at line 443 of file fstream.
Closes the currently associated file.
Returns:
If no file is currently open, this function immediately fails.
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 213 of file fstream.tcc.
Access to the get area. These functions are only available to other protected functions, including derived classes.
Definition at line 489 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::sputbackc(), and std::basic_streambuf< _Elem, _Tr >::sungetc().
Access to the get area. These functions are only available to other protected functions, including derived classes.
Definition at line 495 of file streambuf.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_create_pback(), std::basic_streambuf< _Elem, _Tr >::in_avail(), std::basic_streambuf< _Elem, _Tr >::sbumpc(), std::basic_streambuf< _Elem, _Tr >::sgetc(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::showmanyc(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::str().
Access to the put area. These functions are only available to other protected functions, including derived classes.
Definition at line 542 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::sputc().
Moving the read position.
Parameters:
This just advances the read position without returning any data.
Definition at line 505 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::sbumpc(), std::basic_streambuf< _Elem, _Tr >::sputbackc(), std::basic_streambuf< _Elem, _Tr >::sungetc(), and std::basic_streambuf< _Elem, _Tr >::uflow().
Locale access.
Returns:
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 233 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::pubimbue().
Access to the get area. These functions are only available to other protected functions, including derived classes.
Definition at line 492 of file streambuf.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_create_pback(), std::basic_streambuf< _Elem, _Tr >::in_avail(), std::basic_streambuf< _Elem, _Tr >::sbumpc(), std::basic_streambuf< _Elem, _Tr >::sgetc(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::showmanyc(), std::basic_streambuf< _Elem, _Tr >::sputbackc(), std::basic_streambuf< _Elem, _Tr >::sungetc(), and std::basic_streambuf< _Elem, _Tr >::uflow().
Changes translations.
Parameters:
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:
Definition at line 583 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::pubimbue().
Looking ahead into the stream.
Returns:
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 291 of file streambuf.
Returns true if the external file is open.
Definition at line 260 of file fstream.
Opens an external file.
Parameters:
Returns:
If a file is already open, this function immediately fails. Otherwise it tries to open the file named __s using the flags given in __mode.
Table 92, adapted here, gives the relation between openmode combinations and the equivalent fopen() flags. (NB: lines app, in|out|app, in|app, binary|app, binary|in|out|app, and binary|in|app per DR 596)
+---------------------------------------------------------+ | ios_base Flag combination stdio equivalent | |binary in out trunc app | +---------------------------------------------------------+ | + w | | + + a | | + a | | + + w | | + r | | + + r+ | | + + + w+ | | + + + a+ | | + + a+ | +---------------------------------------------------------+ | + + wb | | + + + ab | | + + ab | | + + + wb | | + + rb | | + + + r+b | | + + + + w+b | | + + + + a+b | | + + + a+b | +---------------------------------------------------------+
Definition at line 179 of file fstream.tcc.
Opens an external file.
Parameters:
Returns:
Definition at line 315 of file fstream.
Consumes data from the buffer; writes to the controlled sequence.
Parameters:
Returns:
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:
Definition at line 775 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::sputc().
Tries to back up the input sequence.
Parameters:
Returns:
Postcondition:
Note:
Definition at line 731 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::sputbackc(), and std::basic_streambuf< _Elem, _Tr >::sungetc().
Access to the put area. These functions are only available to other protected functions, including derived classes.
Definition at line 536 of file streambuf.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::str().
Moving the write position.
Parameters:
This just advances the write position without returning any data.
Definition at line 552 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::sputc().
Access to the put area. These functions are only available to other protected functions, including derived classes.
Definition at line 539 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::sputc(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::str().
Entry point for imbue().
Parameters:
Returns:
Calls the derived imbue(__loc).
Definition at line 216 of file streambuf.
Alters the stream position.
Parameters:
Calls virtual seekoff function.
Definition at line 258 of file streambuf.
Alters the stream position.
Parameters:
Calls virtual seekpos function.
Definition at line 270 of file streambuf.
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 246 of file streambuf.
Calls virtual sync function.
Definition at line 278 of file streambuf.
Referenced by std::wbuffer_convert< _Codecvt, _Elem, _Tr >::sync().
Getting the next character.
Returns:
If the input read position is available, returns that character and increments the read pointer, otherwise calls and returns uflow().
Definition at line 323 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::snextc().
Alters the stream positions. Each derived class provides its own appropriate behavior.
Note:
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 798 of file fstream.tcc.
Alters the stream positions. Each derived class provides its own appropriate behavior.
Note:
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 858 of file fstream.tcc.
Manipulates the buffer.
Parameters:
Returns:
If no file has been opened, and both __s and __n are zero, then the stream becomes unbuffered. Otherwise, __s is used as a buffer; see https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering for more.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 769 of file fstream.tcc.
Setting the three read area pointers.
Parameters:
Postcondition:
Definition at line 516 of file streambuf.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_create_pback(), and std::basic_filebuf< char_type, traits_type >::_M_set_buffer().
Setting the three write area pointers.
Parameters:
Postcondition:
Definition at line 562 of file streambuf.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_set_buffer().
Getting the next character.
Returns:
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 345 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::snextc().
Entry point for xsgetn.
Parameters:
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 364 of file streambuf.
Investigating the data available.
Returns:
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:
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 263 of file fstream.tcc.
Getting the next character.
Returns:
Calls sbumpc(), and if that function returns traits::eof(), so does this function. Otherwise, sgetc().
Definition at line 305 of file streambuf.
Pushing characters back into the input stream.
Parameters:
Returns:
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 379 of file streambuf.
Entry point for all single-character output functions.
Parameters:
Returns:
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 431 of file streambuf.
Referenced by std::ostreambuf_iterator< _CharT, _Traits >::operator=().
Entry point for all single-character output functions.
Parameters:
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 457 of file streambuf.
Moving backwards in the input stream.
Returns:
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 404 of file streambuf.
Synchronizes the buffer arrays with the controlled sequences.
Returns:
Each derived class provides its own appropriate behavior, including the definition of failure.
Note:
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 978 of file fstream.tcc.
Fetches more data from the controlled sequence.
Returns:
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 707 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::sbumpc().
Fetches more data from the controlled sequence.
Returns:
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 https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html
Note:
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 289 of file fstream.tcc.
Multiple character extraction.
Parameters:
Returns:
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 from std::basic_streambuf< _CharT, _Traits >.
Definition at line 635 of file fstream.tcc.
Multiple character insertion.
Parameters:
Returns:
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 from std::basic_streambuf< _CharT, _Traits >.
Definition at line 721 of file fstream.tcc.
Pointer to the beginning of internal buffer.
Definition at line 136 of file fstream.
Current locale setting.
Definition at line 199 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::getloc(), and std::basic_streambuf< _Elem, _Tr >::pubimbue().
Definition at line 143 of file fstream.
Definition at line 178 of file fstream.
Definition at line 183 of file fstream.
Definition at line 190 of file fstream.
Start of get area.
Definition at line 191 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::eback(), and std::basic_streambuf< _Elem, _Tr >::setg().
Current read area.
Definition at line 192 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::gbump(), std::basic_streambuf< _Elem, _Tr >::gptr(), and std::basic_streambuf< _Elem, _Tr >::setg().
End of get area.
Definition at line 193 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::egptr(), and std::basic_streambuf< _Elem, _Tr >::setg().
Place to stash in || out || in | out settings for current filebuf.
Definition at line 121 of file fstream.
Start of put area.
Definition at line 194 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::pbase(), and std::basic_streambuf< _Elem, _Tr >::setp().
Current put area.
Definition at line 195 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::pbump(), std::basic_streambuf< _Elem, _Tr >::pptr(), and std::basic_streambuf< _Elem, _Tr >::setp().
End of put area.
Definition at line 196 of file streambuf.
Referenced by std::basic_streambuf< _Elem, _Tr >::epptr(), and std::basic_streambuf< _Elem, _Tr >::setp().
Note:
Definition at line 164 of file fstream.
Note:
Definition at line 165 of file fstream.
Note:
Definition at line 166 of file fstream.
Note:
Definition at line 167 of file fstream.
NB: _M_reading == true && _M_writing == true is unused.
Definition at line 155 of file fstream.
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