libstdc++
__gnu_cxx::enc_filebuf< _CharT > Class Template Reference
Inheritance diagram for __gnu_cxx::enc_filebuf< _CharT >:

List of all members.

Public Types

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

Public Member Functions

 enc_filebuf (state_type &__state)
__filebuf_typeclose ()
streamsize in_avail ()
bool is_open () const throw ()
__filebuf_typeopen (const char *__s, ios_base::openmode __mode)
__filebuf_typeopen (const std::string &__s, ios_base::openmode __mode)
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)
int_type sungetc ()

Protected Member Functions

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)
virtual void imbue (const locale &__loc)
virtual int_type overflow (int_type __c=encoding_char_traits< _CharT >::eof())
virtual int_type pbackfail (int_type __c=encoding_char_traits< _CharT >::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 __pos, ios_base::openmode __mode=ios_base::in|ios_base::out)
virtual __streambuf_typesetbuf (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_typeeback () const
char_typegptr () const
char_typeegptr () const
char_typepbase () const
char_typepptr () const
char_typeepptr () const

Protected Attributes

char_type_M_buf
bool _M_buf_allocated
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
__c_lock _M_lock
ios_base::openmode _M_mode
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
locale pubimbue (const locale &__loc)
locale getloc () const
__streambuf_typepubsetbuf (char_type *__s, streamsize __n)
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 ()
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

Detailed Description

template<typename _CharT>
class __gnu_cxx::enc_filebuf< _CharT >

class enc_filebuf.

Definition at line 42 of file enc_filebuf.h.


Member Typedef Documentation

This is a non-standard type.

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

Definition at line 79 of file fstream.

typedef _CharT std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::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, encoding_char_traits< _CharT > >.

Definition at line 73 of file fstream.

typedef traits_type::int_type std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::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, encoding_char_traits< _CharT > >.

Definition at line 75 of file fstream.

typedef traits_type::off_type std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::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, encoding_char_traits< _CharT > >.

Definition at line 77 of file fstream.

template<typename _CharT >
typedef traits_type::pos_type __gnu_cxx::enc_filebuf< _CharT >::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_filebuf< _CharT, encoding_char_traits< _CharT > >.

Definition at line 48 of file enc_filebuf.h.

template<typename _CharT >
typedef encoding_char_traits<_CharT> __gnu_cxx::enc_filebuf< _CharT >::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_filebuf< _CharT, encoding_char_traits< _CharT > >.

Definition at line 46 of file enc_filebuf.h.


Member Function Documentation

void std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_create_pback ( )
inlineprotectedinherited

Initializes pback buffers, and moves normal buffers to safety. Assumptions: _M_in_cur has already been moved back

Definition at line 174 of file fstream.

void std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_destroy_pback ( ) throw ()
inlineprotectedinherited

Deactivates pback buffer contents, and restores normal buffer. Assumptions: The pback buffer has only moved forward.

Definition at line 191 of file fstream.

void std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_set_buffer ( streamsize  __off)
inlineprotectedinherited

This function sets the pointers of the internal buffer, both get and put areas. Typically:

__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 392 of file fstream.

__filebuf_type* std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::close ( )
inherited

Closes the currently associated file.

Returns:
this on success, NULL on failure

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.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::eback ( ) const
inlineprotectedinherited

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 480 of file streambuf.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::egptr ( ) const
inlineprotectedinherited

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 486 of file streambuf.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::epptr ( ) const
inlineprotectedinherited

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 533 of file streambuf.

void std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::gbump ( int  __n)
inlineprotectedinherited

Moving the read position.

Parameters:
__nThe delta by which to move.

This just advances the read position without returning any data.

Definition at line 496 of file streambuf.

locale std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::getloc ( ) const
inlineinherited

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 224 of file streambuf.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::gptr ( ) const
inlineprotectedinherited

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 483 of file streambuf.

virtual void std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::imbue ( const locale __loc)
protectedvirtualinherited

Changes translations.

Parameters:
__locA 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 from std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >.

streamsize std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::in_avail ( )
inlineinherited

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 282 of file streambuf.

bool std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::is_open ( ) const throw ()
inlineinherited

Returns true if the external file is open.

Definition at line 224 of file fstream.

__filebuf_type* std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::open ( const char *  __s,
ios_base::openmode  __mode 
)
inherited

Opens an external file.

Parameters:
__sThe name of the file.
__modeThe open mode flags.
Returns:
this on success, NULL on failure

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 | +———————————————————+

__filebuf_type* std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::open ( const std::string __s,
ios_base::openmode  __mode 
)
inlineinherited

Opens an external file.

Parameters:
__sThe name of the file.
__modeThe open mode flags.
Returns:
this on success, NULL on failure

Definition at line 277 of file fstream.

virtual int_type std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::overflow ( int_type  __c = _Traits::eof())
protectedvirtualinherited

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

Parameters:
__cAn 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, encoding_char_traits< _CharT > >.

virtual int_type std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::pbackfail ( int_type  __c = _Traits::eof())
protectedvirtualinherited

Tries to back up the input sequence.

Parameters:
__cThe 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, encoding_char_traits< _CharT > >.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::pbase ( ) const
inlineprotectedinherited

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 527 of file streambuf.

void std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::pbump ( int  __n)
inlineprotectedinherited

Moving the write position.

Parameters:
__nThe delta by which to move.

This just advances the write position without returning any data.

Definition at line 543 of file streambuf.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::pptr ( ) const
inlineprotectedinherited

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 530 of file streambuf.

locale std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::pubimbue ( const locale __loc)
inlineinherited

Entry point for imbue().

Parameters:
__locThe new locale.
Returns:
The previous locale.

Calls the derived imbue(__loc).

Definition at line 207 of file streambuf.

pos_type std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::pubseekoff ( off_type  __off,
ios_base::seekdir  __way,
ios_base::openmode  __mode = ios_base::in | ios_base::out 
)
inlineinherited

Alters the stream position.

Parameters:
__offOffset.
__wayValue for ios_base::seekdir.
__modeValue for ios_base::openmode.

Calls virtual seekoff function.

Definition at line 249 of file streambuf.

pos_type std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::pubseekpos ( pos_type  __sp,
ios_base::openmode  __mode = ios_base::in | ios_base::out 
)
inlineinherited

Alters the stream position.

Parameters:
__spPosition
__modeValue for ios_base::openmode.

Calls virtual seekpos function.

Definition at line 261 of file streambuf.

__streambuf_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::pubsetbuf ( char_type __s,
streamsize  __n 
)
inlineinherited

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 237 of file streambuf.

int std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::pubsync ( )
inlineinherited

Calls virtual sync function.

Definition at line 269 of file streambuf.

int_type std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::sbumpc ( )
inlineinherited

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 314 of file streambuf.

virtual pos_type std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::seekoff ( off_type  ,
ios_base::seekdir  ,
ios_base::openmode  = ios_base::in | ios_base::out 
)
protectedvirtualinherited

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, encoding_char_traits< _CharT > >.

virtual pos_type std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::seekpos ( pos_type  ,
ios_base::openmode  = ios_base::in | ios_base::out 
)
protectedvirtualinherited

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, encoding_char_traits< _CharT > >.

virtual __streambuf_type* std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::setbuf ( char_type *  __s,
streamsize  __n 
)
protectedvirtualinherited

Manipulates the buffer.

Parameters:
__sPointer to a buffer area.
__nSize of __s.
Returns:
this

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

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

void std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::setg ( char_type __gbeg,
char_type __gnext,
char_type __gend 
)
inlineprotectedinherited

Setting the three read area pointers.

Parameters:
__gbegA pointer.
__gnextA pointer.
__gendA pointer.
Postcondition:
__gbeg == eback(), __gnext == gptr(), and __gend == egptr()

Definition at line 507 of file streambuf.

void std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::setp ( char_type __pbeg,
char_type __pend 
)
inlineprotectedinherited

Setting the three write area pointers.

Parameters:
__pbegA pointer.
__pendA pointer.
Postcondition:
__pbeg == pbase(), __pbeg == pptr(), and __pend == epptr()

Definition at line 553 of file streambuf.

int_type std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::sgetc ( )
inlineinherited

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 336 of file streambuf.

streamsize std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::sgetn ( char_type __s,
streamsize  __n 
)
inlineinherited

Entry point for xsgetn.

Parameters:
__sA buffer area.
__nA 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 355 of file streambuf.

virtual streamsize std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::showmanyc ( )
protectedvirtualinherited

Investigating the data available.

Returns:
An estimate of the number of characters available in the input sequence, or -1.

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:
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, encoding_char_traits< _CharT > >.

int_type std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::snextc ( )
inlineinherited

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 296 of file streambuf.

int_type std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::sputbackc ( char_type  __c)
inlineinherited

Pushing characters back into the input stream.

Parameters:
__cThe 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 370 of file streambuf.

int_type std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::sputc ( char_type  __c)
inlineinherited

Entry point for all single-character output functions.

Parameters:
__cA 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 422 of file streambuf.

streamsize std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::sputn ( const char_type __s,
streamsize  __n 
)
inlineinherited

Entry point for all single-character output functions.

Parameters:
__sA buffer read area.
__nA 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 448 of file streambuf.

int_type std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::sungetc ( )
inlineinherited

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 395 of file streambuf.

virtual int std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::sync ( void  )
protectedvirtualinherited

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 from std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >.

virtual int_type std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::uflow ( )
inlineprotectedvirtualinherited

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.

Definition at line 698 of file streambuf.

virtual int_type std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::underflow ( )
protectedvirtualinherited

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, encoding_char_traits< _CharT > >.

virtual streamsize std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::xsgetn ( char_type *  __s,
streamsize  __n 
)
protectedvirtualinherited

Multiple character extraction.

Parameters:
__sA buffer area.
__nMaximum 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 from std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >.

virtual streamsize std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::xsputn ( const char_type *  __s,
streamsize  __n 
)
protectedvirtualinherited

Multiple character insertion.

Parameters:
__sA buffer area.
__nMaximum 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 from std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >.


Member Data Documentation

char_type* std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_buf
protectedinherited

Pointer to the beginning of internal buffer.

Definition at line 111 of file fstream.

locale std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::_M_buf_locale
protectedinherited

Current locale setting.

Definition at line 190 of file streambuf.

size_t std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_buf_size
protectedinherited

Actual size of internal buffer. This number is equal to the size of the put area + 1 position, reserved for the overflow char of a full area.

Definition at line 118 of file fstream.

char* std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_ext_buf
protectedinherited

Buffer for external characters. Used for input when codecvt::always_noconv() == false. When valid, this corresponds to eback().

Definition at line 153 of file fstream.

streamsize std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_ext_buf_size
protectedinherited

Size of buffer held by _M_ext_buf.

Definition at line 158 of file fstream.

const char* std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_ext_next
protectedinherited

Pointers into the buffer held by _M_ext_buf that delimit a subsequence of bytes that have been read but not yet converted. When valid, _M_ext_next corresponds to egptr().

Definition at line 165 of file fstream.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::_M_in_beg
protectedinherited

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 182 of file streambuf.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::_M_in_cur
protectedinherited

Entry point for imbue().

Parameters:
__locThe new locale.
Returns:
The previous locale.

Calls the derived imbue(__loc).

Definition at line 183 of file streambuf.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::_M_in_end
protectedinherited

Entry point for imbue().

Parameters:
__locThe new locale.
Returns:
The previous locale.

Calls the derived imbue(__loc).

Definition at line 184 of file streambuf.

ios_base::openmode std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_mode
protectedinherited

Place to stash in || out || in | out settings for current filebuf.

Definition at line 96 of file fstream.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::_M_out_beg
protectedinherited

Entry point for imbue().

Parameters:
__locThe new locale.
Returns:
The previous locale.

Calls the derived imbue(__loc).

Definition at line 185 of file streambuf.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::_M_out_cur
protectedinherited

Entry point for imbue().

Parameters:
__locThe new locale.
Returns:
The previous locale.

Calls the derived imbue(__loc).

Definition at line 186 of file streambuf.

char_type* std::basic_streambuf< _CharT, encoding_char_traits< _CharT > >::_M_out_end
protectedinherited

Entry point for imbue().

Parameters:
__locThe new locale.
Returns:
The previous locale.

Calls the derived imbue(__loc).

Definition at line 187 of file streambuf.

char_type std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_pback
protectedinherited

Necessary bits for putback buffer management.

Note:
pbacks of over one character are not currently supported.

Definition at line 139 of file fstream.

char_type* std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_pback_cur_save
protectedinherited

Necessary bits for putback buffer management.

Note:
pbacks of over one character are not currently supported.

Definition at line 140 of file fstream.

char_type* std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_pback_end_save
protectedinherited

Necessary bits for putback buffer management.

Note:
pbacks of over one character are not currently supported.

Definition at line 141 of file fstream.

bool std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_pback_init
protectedinherited

Necessary bits for putback buffer management.

Note:
pbacks of over one character are not currently supported.

Definition at line 142 of file fstream.

bool std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >::_M_reading
protectedinherited

_M_reading == false && _M_writing == false for uncommitted mode; _M_reading == true for read mode; _M_writing == true for write mode;

NB: _M_reading == true && _M_writing == true is unused.

Definition at line 130 of file fstream.


The documentation for this class was generated from the following file: