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std::basic_filebuf< _CharT, _Traits > Class Template Reference
I/O

#include <fstream>

Inheritance diagram for std::basic_filebuf< _CharT, _Traits >:
[legend]

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 traits_type
 

Public Member Functions

 basic_filebuf ()
 
 basic_filebuf (basic_filebuf &&)
 
 basic_filebuf (const basic_filebuf &)=delete
 
virtual ~basic_filebuf ()
 
__filebuf_type * close ()
 
locale getloc () const
 
streamsize in_avail ()
 
bool is_open () const throw ()
 
template<typename _Path>
_If_fs_path< _Path, __filebuf_type * > open (const _Path &__s, ios_base::openmode __mode)
 
__filebuf_type * open (const char *__s, ios_base::openmode __mode)
 
__filebuf_type * open (const std::string &__s, ios_base::openmode __mode)
 
basic_filebuf & operator= (basic_filebuf &&)
 
basic_filebuf & operator= (const basic_filebuf &)=delete
 
locale pubimbue (const locale &__loc)
 
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 ()
 
void swap (basic_filebuf &)
 
basic_streambuf * pubsetbuf (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 ()
 

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=_Traits::eof())
 
virtual int_type pbackfail (int_type __c=_Traits::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_type * setbuf (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 ()
 
void swap (basic_streambuf &__sb)
 
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_type * eback () const
 
char_type * gptr () const
 
char_type * egptr () const
 
char_type * pbase () const
 
char_type * pptr () const
 
char_type * epptr () const
 

Protected Attributes

char_type * _M_buf
 
bool _M_buf_allocated
 
locale _M_buf_locale
 
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
 
char_type * _M_in_cur
 
char_type * _M_in_end
 
__c_lock _M_lock
 
ios_base::openmode _M_mode
 
char_type * _M_out_beg
 
char_type * _M_out_cur
 
char_type * _M_out_end
 
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
 

Friends

class ios_base
 

Detailed Description

template<typename _CharT, typename _Traits>
class std::basic_filebuf< _CharT, _Traits >

The actual work of input and output (for files).

Template Parameters
_CharTType of character stream.
_TraitsTraits for character type, defaults to char_traits<_CharT>.

This class associates both its input and output sequence with an external disk file, and maintains a joint file position for both sequences. Many of its semantics are described in terms of similar behavior in the Standard C Library's FILE streams.

Requirements on traits_type, specific to this class:

  • traits_type::pos_type must be fpos<traits_type::state_type>
  • traits_type::off_type must be streamoff
  • traits_type::state_type must be Assignable and DefaultConstructible,
  • traits_type::state_type() must be the initial state for codecvt.

Definition at line 92 of file fstream.

Member Typedef Documentation

◆ __codecvt_type

template<typename _CharT, typename _Traits>
typedef codecvt<char_type, char, __state_type> std::basic_filebuf< _CharT, _Traits >::__codecvt_type

Definition at line 120 of file fstream.

◆ __file_type

template<typename _CharT, typename _Traits>
typedef __basic_file<char> std::basic_filebuf< _CharT, _Traits >::__file_type

Definition at line 118 of file fstream.

◆ __filebuf_type

template<typename _CharT, typename _Traits>
typedef basic_filebuf<char_type, traits_type> std::basic_filebuf< _CharT, _Traits >::__filebuf_type

Definition at line 117 of file fstream.

◆ __state_type

template<typename _CharT, typename _Traits>
typedef traits_type::state_type std::basic_filebuf< _CharT, _Traits >::__state_type

Definition at line 119 of file fstream.

◆ __streambuf_type

template<typename _CharT, typename _Traits>
typedef basic_streambuf<char_type, traits_type> std::basic_filebuf< _CharT, _Traits >::__streambuf_type

Definition at line 116 of file fstream.

◆ char_type

template<typename _CharT, typename _Traits>
typedef _CharT std::basic_filebuf< _CharT, _Traits >::char_type

Definition at line 110 of file fstream.

◆ int_type

template<typename _CharT, typename _Traits>
typedef traits_type::int_type std::basic_filebuf< _CharT, _Traits >::int_type

Definition at line 112 of file fstream.

◆ off_type

template<typename _CharT, typename _Traits>
typedef traits_type::off_type std::basic_filebuf< _CharT, _Traits >::off_type

Definition at line 114 of file fstream.

◆ pos_type

template<typename _CharT, typename _Traits>
typedef traits_type::pos_type std::basic_filebuf< _CharT, _Traits >::pos_type

Definition at line 113 of file fstream.

◆ traits_type

template<typename _CharT, typename _Traits>
typedef _Traits std::basic_filebuf< _CharT, _Traits >::traits_type

Definition at line 111 of file fstream.

Constructor & Destructor Documentation

◆ basic_filebuf() [1/2]

template<typename _CharT, typename _Traits>
std::basic_filebuf< _CharT, _Traits >::basic_filebuf ( )

Does not open any files.

The default constructor initializes the parent class using its own default ctor.

Definition at line 85 of file fstream.tcc.

References _M_buf, std::basic_streambuf< _CharT, _Traits >::_M_buf_locale, _M_buf_size, _M_ext_buf, _M_ext_buf_size, _M_ext_next, _M_mode, _M_pback, _M_pback_cur_save, _M_pback_end_save, _M_pback_init, and _M_reading.

Referenced by __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), and close().

◆ basic_filebuf() [2/2]

template<typename _CharT, typename _Traits>
std::basic_filebuf< _CharT, _Traits >::basic_filebuf ( basic_filebuf< _CharT, _Traits > && __rhs)

Definition at line 99 of file fstream.tcc.

◆ ~basic_filebuf()

template<typename _CharT, typename _Traits>
virtual std::basic_filebuf< _CharT, _Traits >::~basic_filebuf ( )
inlinevirtual

The destructor closes the file first.

Definition at line 258 of file fstream.

Member Function Documentation

◆ __safe_gbump()

template<typename _CharT, typename _Traits>
void std::basic_streambuf< _CharT, _Traits >::__safe_gbump ( streamsize __n)
inlineprotectedinherited

Definition at line 804 of file streambuf.

◆ __safe_pbump()

template<typename _CharT, typename _Traits>
void std::basic_streambuf< _CharT, _Traits >::__safe_pbump ( streamsize __n)
inlineprotectedinherited

Definition at line 807 of file streambuf.

◆ _M_allocate_internal_buffer()

template<typename _CharT, typename _Traits>
void std::basic_filebuf< _CharT, _Traits >::_M_allocate_internal_buffer ( )
protected

Definition at line 54 of file fstream.tcc.

◆ _M_convert_to_external()

template<typename _CharT, typename _Traits>
bool std::basic_filebuf< _CharT, _Traits >::_M_convert_to_external ( char_type * __ibuf,
streamsize __ilen )
protected

Definition at line 610 of file fstream.tcc.

◆ _M_create_pback()

template<typename _CharT, typename _Traits>
void std::basic_filebuf< _CharT, _Traits >::_M_create_pback ( )
inlineprotected

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

Definition at line 211 of file fstream.

Referenced by pbackfail().

◆ _M_destroy_internal_buffer()

template<typename _CharT, typename _Traits>
void std::basic_filebuf< _CharT, _Traits >::_M_destroy_internal_buffer ( )
throw ( )
protected

Definition at line 68 of file fstream.tcc.

◆ _M_destroy_pback()

template<typename _CharT, typename _Traits>
void std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback ( )
throw ( )
inlineprotected

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

Definition at line 228 of file fstream.

Referenced by overflow(), seekoff(), seekpos(), underflow(), and xsgetn().

◆ _M_get_ext_pos()

template<typename _CharT, typename _Traits>
int std::basic_filebuf< _CharT, _Traits >::_M_get_ext_pos ( __state_type & __state)
protected

Definition at line 933 of file fstream.tcc.

◆ _M_seek()

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::pos_type std::basic_filebuf< _CharT, _Traits >::_M_seek ( off_type __off,
ios_base::seekdir __way,
__state_type __state )
protected

Definition at line 908 of file fstream.tcc.

◆ _M_set_buffer()

template<typename _CharT, typename _Traits>
void std::basic_filebuf< _CharT, _Traits >::_M_set_buffer ( streamsize __off)
inlineprotected

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 502 of file fstream.

Referenced by __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), close(), imbue(), open(), overflow(), pbackfail(), underflow(), xsgetn(), and xsputn().

◆ _M_terminate_output()

template<typename _CharT, typename _Traits>
bool std::basic_filebuf< _CharT, _Traits >::_M_terminate_output ( )
protected

Definition at line 952 of file fstream.tcc.

◆ close()

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::__filebuf_type * std::basic_filebuf< _CharT, _Traits >::close ( )

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.

Definition at line 253 of file fstream.tcc.

References basic_filebuf(), _M_mode, _M_pback_init, _M_reading, _M_set_buffer(), and is_open().

Referenced by open().

◆ eback()

template<typename _CharT, typename _Traits>
char_type * std::basic_streambuf< _CharT, _Traits >::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 491 of file streambuf.

Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

◆ egptr()

template<typename _CharT, typename _Traits>
char_type * std::basic_streambuf< _CharT, _Traits >::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 497 of file streambuf.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_filebuf< _CharT, _Traits >::underflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), std::wbuffer_convert< _Codecvt, _Elem, _Tr >::underflow(), std::basic_filebuf< _CharT, _Traits >::xsgetn(), and xsgetn().

◆ epptr()

template<typename _CharT, typename _Traits>
char_type * std::basic_streambuf< _CharT, _Traits >::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 544 of file streambuf.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::xsputn(), and xsputn().

◆ gbump()

template<typename _CharT, typename _Traits>
void std::basic_streambuf< _CharT, _Traits >::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 507 of file streambuf.

Referenced by std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::pbackfail(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

◆ getloc()

template<typename _CharT, typename _Traits>
locale std::basic_streambuf< _CharT, _Traits >::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 235 of file streambuf.

◆ gptr()

template<typename _CharT, typename _Traits>
char_type * std::basic_streambuf< _CharT, _Traits >::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 494 of file streambuf.

Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_filebuf< _CharT, _Traits >::underflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), std::wbuffer_convert< _Codecvt, _Elem, _Tr >::underflow(), std::basic_filebuf< _CharT, _Traits >::xsgetn(), and xsgetn().

◆ imbue()

template<typename _CharT, typename _Traits>
void std::basic_filebuf< _CharT, _Traits >::imbue ( const locale & __loc)
protectedvirtual

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, _Traits >.

Definition at line 1030 of file fstream.tcc.

References _M_ext_buf, _M_ext_next, _M_mode, _M_reading, _M_set_buffer(), std::ios_base::cur, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::gptr(), is_open(), and seekoff().

◆ in_avail()

template<typename _CharT, typename _Traits>
streamsize std::basic_streambuf< _CharT, _Traits >::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 293 of file streambuf.

◆ is_open()

template<typename _CharT, typename _Traits>
bool std::basic_filebuf< _CharT, _Traits >::is_open ( ) const
throw ( )
inlinenodiscard

Returns true if the external file is open.

Definition at line 278 of file fstream.

Referenced by __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), close(), imbue(), open(), seekoff(), seekpos(), setbuf(), and showmanyc().

◆ open() [1/3]

template<typename _CharT, typename _Traits>
template<typename _Path>
_If_fs_path< _Path, __filebuf_type * > std::basic_filebuf< _CharT, _Traits >::open ( const _Path & __s,
ios_base::openmode __mode )
inline

Opens an external file.

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

Definition at line 356 of file fstream.

◆ open() [2/3]

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::__filebuf_type * std::basic_filebuf< _CharT, _Traits >::open ( const char * __s,
ios_base::openmode __mode )

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                |
+---------------------------------------------------------+

Definition at line 183 of file fstream.tcc.

References _M_mode, _M_reading, _M_set_buffer(), std::ios_base::ate, close(), std::ios_base::end, is_open(), and seekoff().

◆ open() [3/3]

template<typename _CharT, typename _Traits>
__filebuf_type * std::basic_filebuf< _CharT, _Traits >::open ( const std::string & __s,
ios_base::openmode __mode )
inline

Opens an external file.

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

Definition at line 344 of file fstream.

◆ operator=()

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits > & std::basic_filebuf< _CharT, _Traits >::operator= ( basic_filebuf< _CharT, _Traits > && __rhs)

Definition at line 128 of file fstream.tcc.

◆ overflow()

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::int_type std::basic_filebuf< _CharT, _Traits >::overflow ( int_type __c = _Traits::eof())
protectedvirtual

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, _Traits >.

Definition at line 545 of file fstream.tcc.

References _M_buf_size, _M_destroy_pback(), _M_mode, _M_reading, _M_set_buffer(), std::ios_base::app, std::ios_base::cur, std::ios_base::out, std::basic_streambuf< _CharT, _Traits >::pbase(), std::basic_streambuf< _CharT, _Traits >::pbump(), and std::basic_streambuf< _CharT, _Traits >::pptr().

Referenced by pbackfail(), sync(), underflow(), and xsgetn().

◆ pbackfail()

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::int_type std::basic_filebuf< _CharT, _Traits >::pbackfail ( int_type __c = _Traits::eof())
protectedvirtual

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, _Traits >.

Definition at line 486 of file fstream.tcc.

References _M_create_pback(), _M_mode, _M_pback_init, _M_reading, _M_set_buffer(), std::ios_base::cur, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::gbump(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::ios_base::in, overflow(), seekoff(), and underflow().

◆ pbase()

template<typename _CharT, typename _Traits>
char_type * std::basic_streambuf< _CharT, _Traits >::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 538 of file streambuf.

Referenced by std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::sync(), and std::basic_filebuf< _CharT, _Traits >::xsputn().

◆ pbump()

template<typename _CharT, typename _Traits>
void std::basic_streambuf< _CharT, _Traits >::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 554 of file streambuf.

Referenced by std::basic_filebuf< _CharT, _Traits >::overflow(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow().

◆ pptr()

template<typename _CharT, typename _Traits>
char_type * std::basic_streambuf< _CharT, _Traits >::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 541 of file streambuf.

Referenced by std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_filebuf< _CharT, _Traits >::sync(), std::basic_filebuf< _CharT, _Traits >::xsputn(), and xsputn().

◆ pubimbue()

template<typename _CharT, typename _Traits>
locale std::basic_streambuf< _CharT, _Traits >::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 218 of file streambuf.

◆ pubseekoff()

template<typename _CharT, typename _Traits>
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 )
inlineinherited

Alters the stream position.

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

Calls virtual seekoff function.

Definition at line 260 of file streambuf.

◆ pubseekpos()

template<typename _CharT, typename _Traits>
pos_type std::basic_streambuf< _CharT, _Traits >::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 272 of file streambuf.

◆ pubsetbuf()

template<typename _CharT, typename _Traits>
basic_streambuf * std::basic_streambuf< _CharT, _Traits >::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 248 of file streambuf.

◆ pubsync()

template<typename _CharT, typename _Traits>
int std::basic_streambuf< _CharT, _Traits >::pubsync ( )
inlineinherited

Calls virtual sync function.

Definition at line 280 of file streambuf.

Referenced by std::basic_istream< _CharT, _Traits >::sync().

◆ sbumpc()

template<typename _CharT, typename _Traits>
int_type std::basic_streambuf< _CharT, _Traits >::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 325 of file streambuf.

Referenced by std::basic_istream< _CharT, _Traits >::getline().

◆ seekoff()

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::pos_type std::basic_filebuf< _CharT, _Traits >::seekoff ( off_type ,
ios_base::seekdir ,
ios_base::openmode = ios_base::in | ios_base::out )
protectedvirtual

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, _Traits >.

Definition at line 833 of file fstream.tcc.

References _M_destroy_pback(), _M_reading, std::ios_base::cur, is_open(), std::basic_streambuf< _CharT, _Traits >::pbase(), and std::basic_streambuf< _CharT, _Traits >::pptr().

Referenced by imbue(), open(), and pbackfail().

◆ seekpos()

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::pos_type std::basic_filebuf< _CharT, _Traits >::seekpos ( pos_type ,
ios_base::openmode = ios_base::in | ios_base::out )
protectedvirtual

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, _Traits >.

Definition at line 893 of file fstream.tcc.

References _M_destroy_pback(), std::ios_base::beg, and is_open().

◆ setbuf()

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::__streambuf_type * std::basic_filebuf< _CharT, _Traits >::setbuf ( char_type * __s,
streamsize __n )
protectedvirtual

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 https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering for more.

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

Definition at line 804 of file fstream.tcc.

References _M_buf, _M_buf_size, and is_open().

◆ setg()

template<typename _CharT, typename _Traits>
void std::basic_streambuf< _CharT, _Traits >::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 518 of file streambuf.

Referenced by std::wbuffer_convert< _Codecvt, _Elem, _Tr >::wbuffer_convert(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

◆ setp()

template<typename _CharT, typename _Traits>
void std::basic_streambuf< _CharT, _Traits >::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 564 of file streambuf.

Referenced by std::wbuffer_convert< _Codecvt, _Elem, _Tr >::wbuffer_convert().

◆ sgetc()

template<typename _CharT, typename _Traits>
int_type std::basic_streambuf< _CharT, _Traits >::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 347 of file streambuf.

Referenced by std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), and std::basic_istream< _CharT, _Traits >::ignore().

◆ sgetn()

template<typename _CharT, typename _Traits>
streamsize std::basic_streambuf< _CharT, _Traits >::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 366 of file streambuf.

◆ showmanyc()

template<typename _CharT, typename _Traits>
streamsize std::basic_filebuf< _CharT, _Traits >::showmanyc ( )
protectedvirtual

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, _Traits >.

Definition at line 301 of file fstream.tcc.

References _M_mode, std::ios_base::binary, std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::ios_base::in, and is_open().

◆ snextc()

template<typename _CharT, typename _Traits>
int_type std::basic_streambuf< _CharT, _Traits >::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 307 of file streambuf.

Referenced by std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< char_type, traits_type >::ignore(), std::basic_istream< char_type, traits_type >::operator>>(), and std::basic_istream< char_type, traits_type >::putback().

◆ sputbackc()

template<typename _CharT, typename _Traits>
int_type std::basic_streambuf< _CharT, _Traits >::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 381 of file streambuf.

Referenced by std::basic_istream< _CharT, _Traits >::putback().

◆ sputc()

template<typename _CharT, typename _Traits>
int_type std::basic_streambuf< _CharT, _Traits >::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 433 of file streambuf.

Referenced by std::wbuffer_convert< _Codecvt, _Elem, _Tr >::overflow().

◆ sputn()

template<typename _CharT, typename _Traits>
streamsize std::basic_streambuf< _CharT, _Traits >::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 459 of file streambuf.

◆ sungetc()

template<typename _CharT, typename _Traits>
int_type std::basic_streambuf< _CharT, _Traits >::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 406 of file streambuf.

Referenced by std::basic_istream< char_type, traits_type >::sentry::sentry().

◆ swap() [1/2]

template<typename _CharT, typename _Traits>
void std::basic_filebuf< _CharT, _Traits >::swap ( basic_filebuf< _CharT, _Traits > & __rhs)

Definition at line 157 of file fstream.tcc.

◆ swap() [2/2]

template<typename _CharT, typename _Traits>
void std::basic_streambuf< _CharT, _Traits >::swap ( basic_streambuf< _CharT, _Traits > & __sb)
inlineprotectedinherited

Definition at line 821 of file streambuf.

◆ sync()

template<typename _CharT, typename _Traits>
int std::basic_filebuf< _CharT, _Traits >::sync ( )
protectedvirtual

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, _Traits >.

Definition at line 1013 of file fstream.tcc.

References overflow(), std::basic_streambuf< _CharT, _Traits >::pbase(), and std::basic_streambuf< _CharT, _Traits >::pptr().

◆ uflow()

template<typename _CharT, typename _Traits>
virtual int_type std::basic_streambuf< _CharT, _Traits >::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.

Reimplemented in __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >.

Definition at line 709 of file streambuf.

Referenced by xsgetn().

◆ underflow()

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::int_type std::basic_filebuf< _CharT, _Traits >::underflow ( )
protectedvirtual

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 https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html

Note
Base class version does nothing, returns eof().

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

Definition at line 327 of file fstream.tcc.

References _M_buf_size, _M_destroy_pback(), _M_mode, _M_set_buffer(), std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::ios_base::in, and overflow().

Referenced by pbackfail().

◆ xsgetn()

template<typename _CharT, typename _Traits>
streamsize std::basic_filebuf< _CharT, _Traits >::xsgetn ( char_type * __s,
streamsize __n )
protectedvirtual

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, _Traits >.

Definition at line 673 of file fstream.tcc.

References _M_buf_size, _M_destroy_pback(), _M_mode, _M_pback_init, _M_reading, _M_set_buffer(), std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gbump(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::ios_base::in, overflow(), std::basic_streambuf< _CharT, _Traits >::setg(), and std::basic_streambuf< char_type, traits_type >::xsgetn().

◆ xsputn()

template<typename _CharT, typename _Traits>
streamsize std::basic_filebuf< _CharT, _Traits >::xsputn ( const char_type * __s,
streamsize __n )
protectedvirtual

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, _Traits >.

Definition at line 759 of file fstream.tcc.

References _M_buf_size, _M_mode, _M_reading, _M_set_buffer(), std::ios_base::app, std::basic_streambuf< _CharT, _Traits >::epptr(), std::ios_base::out, std::basic_streambuf< _CharT, _Traits >::pbase(), std::basic_streambuf< _CharT, _Traits >::pptr(), and std::basic_streambuf< char_type, traits_type >::xsputn().

Friends And Related Symbol Documentation

◆ ios_base

template<typename _CharT, typename _Traits>
friend class ios_base
friend

Definition at line 122 of file fstream.

Member Data Documentation

◆ _M_buf

template<typename _CharT, typename _Traits>
char_type* std::basic_filebuf< _CharT, _Traits >::_M_buf
protected

Pointer to the beginning of internal buffer.

Definition at line 148 of file fstream.

Referenced by basic_filebuf(), and setbuf().

◆ _M_buf_allocated

template<typename _CharT, typename _Traits>
bool std::basic_filebuf< _CharT, _Traits >::_M_buf_allocated
protected

Definition at line 158 of file fstream.

◆ _M_buf_locale

template<typename _CharT, typename _Traits>
locale std::basic_streambuf< _CharT, _Traits >::_M_buf_locale
protectedinherited

Current locale setting.

Definition at line 201 of file streambuf.

Referenced by std::basic_filebuf< _CharT, _Traits >::basic_filebuf().

◆ _M_buf_size

template<typename _CharT, typename _Traits>
size_t std::basic_filebuf< _CharT, _Traits >::_M_buf_size
protected

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 155 of file fstream.

Referenced by basic_filebuf(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), overflow(), setbuf(), underflow(), xsgetn(), and xsputn().

◆ _M_codecvt

template<typename _CharT, typename _Traits>
const __codecvt_type* std::basic_filebuf< _CharT, _Traits >::_M_codecvt
protected

Definition at line 183 of file fstream.

◆ _M_ext_buf

template<typename _CharT, typename _Traits>
char* std::basic_filebuf< _CharT, _Traits >::_M_ext_buf
protected

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

Definition at line 190 of file fstream.

Referenced by basic_filebuf(), and imbue().

◆ _M_ext_buf_size

template<typename _CharT, typename _Traits>
streamsize std::basic_filebuf< _CharT, _Traits >::_M_ext_buf_size
protected

Size of buffer held by _M_ext_buf.

Definition at line 195 of file fstream.

Referenced by basic_filebuf().

◆ _M_ext_end

template<typename _CharT, typename _Traits>
char* std::basic_filebuf< _CharT, _Traits >::_M_ext_end
protected

Definition at line 203 of file fstream.

◆ _M_ext_next

template<typename _CharT, typename _Traits>
const char* std::basic_filebuf< _CharT, _Traits >::_M_ext_next
protected

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 202 of file fstream.

Referenced by basic_filebuf(), and imbue().

◆ _M_file

template<typename _CharT, typename _Traits>
__file_type std::basic_filebuf< _CharT, _Traits >::_M_file
protected

Definition at line 130 of file fstream.

◆ _M_in_beg

template<typename _CharT, typename _Traits>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_beg
protectedinherited

Start of get area.

Definition at line 193 of file streambuf.

◆ _M_in_cur

template<typename _CharT, typename _Traits>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_cur
protectedinherited

Current read area.

Definition at line 194 of file streambuf.

◆ _M_in_end

template<typename _CharT, typename _Traits>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_end
protectedinherited

End of get area.

Definition at line 195 of file streambuf.

◆ _M_lock

template<typename _CharT, typename _Traits>
__c_lock std::basic_filebuf< _CharT, _Traits >::_M_lock
protected

Definition at line 127 of file fstream.

◆ _M_mode

template<typename _CharT, typename _Traits>
ios_base::openmode std::basic_filebuf< _CharT, _Traits >::_M_mode
protected

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

Definition at line 133 of file fstream.

Referenced by basic_filebuf(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), close(), imbue(), open(), overflow(), pbackfail(), showmanyc(), underflow(), xsgetn(), and xsputn().

◆ _M_out_beg

template<typename _CharT, typename _Traits>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_beg
protectedinherited

Start of put area.

Definition at line 196 of file streambuf.

◆ _M_out_cur

template<typename _CharT, typename _Traits>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_cur
protectedinherited

Current put area.

Definition at line 197 of file streambuf.

◆ _M_out_end

template<typename _CharT, typename _Traits>
char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_end
protectedinherited

End of put area.

Definition at line 198 of file streambuf.

◆ _M_pback

template<typename _CharT, typename _Traits>
char_type std::basic_filebuf< _CharT, _Traits >::_M_pback
protected

Necessary bits for putback buffer management.

Note
pbacks of over one character are not currently supported.

Definition at line 176 of file fstream.

Referenced by basic_filebuf().

◆ _M_pback_cur_save

template<typename _CharT, typename _Traits>
char_type* std::basic_filebuf< _CharT, _Traits >::_M_pback_cur_save
protected

Necessary bits for putback buffer management.

Note
pbacks of over one character are not currently supported.

Definition at line 177 of file fstream.

Referenced by basic_filebuf().

◆ _M_pback_end_save

template<typename _CharT, typename _Traits>
char_type* std::basic_filebuf< _CharT, _Traits >::_M_pback_end_save
protected

Necessary bits for putback buffer management.

Note
pbacks of over one character are not currently supported.

Definition at line 178 of file fstream.

Referenced by basic_filebuf().

◆ _M_pback_init

template<typename _CharT, typename _Traits>
bool std::basic_filebuf< _CharT, _Traits >::_M_pback_init
protected

Necessary bits for putback buffer management.

Note
pbacks of over one character are not currently supported.

Definition at line 179 of file fstream.

Referenced by basic_filebuf(), close(), pbackfail(), and xsgetn().

◆ _M_reading

template<typename _CharT, typename _Traits>
bool std::basic_filebuf< _CharT, _Traits >::_M_reading
protected

_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 167 of file fstream.

Referenced by basic_filebuf(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf(), close(), imbue(), open(), overflow(), pbackfail(), seekoff(), xsgetn(), and xsputn().

◆ _M_state_beg

template<typename _CharT, typename _Traits>
__state_type std::basic_filebuf< _CharT, _Traits >::_M_state_beg
protected

Definition at line 136 of file fstream.

◆ _M_state_cur

template<typename _CharT, typename _Traits>
__state_type std::basic_filebuf< _CharT, _Traits >::_M_state_cur
protected

Definition at line 141 of file fstream.

◆ _M_state_last

template<typename _CharT, typename _Traits>
__state_type std::basic_filebuf< _CharT, _Traits >::_M_state_last
protected

Definition at line 145 of file fstream.

◆ _M_writing

template<typename _CharT, typename _Traits>
bool std::basic_filebuf< _CharT, _Traits >::_M_writing
protected

Definition at line 168 of file fstream.

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