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 std::size_t size_t
typedef _Traits traits_type

Public Member Functions¶

__filebuf_type * close ()
int fd ()
std::__c_file * file ()
streamsize in_avail ()
bool is_open () const throw ()
__filebuf_type * open (const std::string &__s, ios_base::openmode __mode)
__filebuf_type * open (const char *__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)
stdio_filebuf (std::__c_file *__f, std::ios_base::openmode __mode, size_t __size=static_cast< size_t >(BUFSIZ))
stdio_filebuf (int __fd, std::ios_base::openmode __mode, size_t __size=static_cast< size_t >(BUFSIZ))
stdio_filebuf ()
void stossc ()
int_type sungetc ()
virtual ~stdio_filebuf ()

Protected Member Functions¶

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 ()
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 ()
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)

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

Friends¶

template<bool _IsMove, typename _CharT2 > __gnu_cxx::__enable_if< __is_char< _CharT2 >::__value, _CharT2 * >::__type __copy_move_a2 (istreambuf_iterator< _CharT2 >, istreambuf_iterator< _CharT2 >, _CharT2 *)
streamsize __copy_streambufs_eof (__streambuf_type *, __streambuf_type *, bool &)
class basic_ios< char_type, traits_type >
class basic_istream< char_type, traits_type >
class basic_ostream< char_type, traits_type >
template<typename _CharT2 > __gnu_cxx::__enable_if< __is_char< _CharT2 >::__value, istreambuf_iterator< _CharT2 > >::__type find (istreambuf_iterator< _CharT2 >, istreambuf_iterator< _CharT2 >, const _CharT2 &)
template<typename _CharT2 , typename _Traits2 , typename _Alloc > basic_istream< _CharT2, _Traits2 > & getline (basic_istream< _CharT2, _Traits2 > &, basic_string< _CharT2, _Traits2, _Alloc > &, _CharT2)
class ios_base
class istreambuf_iterator< char_type, traits_type >
template<typename _CharT2 , typename _Traits2 , typename _Alloc > basic_istream< _CharT2, _Traits2 > & operator>> (basic_istream< _CharT2, _Traits2 > &, basic_string< _CharT2, _Traits2, _Alloc > &)
template<typename _CharT2 , typename _Traits2 > basic_istream< _CharT2, _Traits2 > & operator>> (basic_istream< _CharT2, _Traits2 > &, _CharT2 *)
class ostreambuf_iterator< char_type, traits_type >


locale getloc () const
locale pubimbue (const locale &__loc)
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)
__streambuf_type * pubsetbuf (char_type *__s, streamsize __n)
int pubsync ()
locale _M_buf_locale
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
char_type * eback () const
char_type * egptr () const
char_type * epptr () const
char_type * gptr () const
char_type * pbase () const
char_type * pptr () const

template<typename _CharT, typename _Traits = std::char_traits<_CharT>> class __gnu_cxx::stdio_filebuf< _CharT, _Traits >¶

Provides a layer of compatibility for C/POSIX.

This GNU extension provides extensions for working with standard C FILE*'s and POSIX file descriptors. It must be instantiated by the user with the type of character used in the file stream, e.g., stdio_filebuf<char>.

Definition at line 47 of file stdio_filebuf.h.

template<typename _CharT, typename _Traits> typedef basic_streambuf<char_type, traits_type> std::basic_filebuf< _CharT, _Traits >::__streambuf_type [inherited]¶

This is a non-standard type.

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

Definition at line 77 of file fstream.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> typedef _CharT __gnu_cxx::stdio_filebuf< _CharT, _Traits >::char_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, _Traits >.

Definition at line 51 of file stdio_filebuf.h.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> typedef traits_type::int_type __gnu_cxx::stdio_filebuf< _CharT, _Traits >::int_type¶

This is a non-standard type.

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

Definition at line 53 of file stdio_filebuf.h.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> typedef traits_type::off_type __gnu_cxx::stdio_filebuf< _CharT, _Traits >::off_type¶

This is a non-standard type.

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

Definition at line 55 of file stdio_filebuf.h.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> typedef traits_type::pos_type __gnu_cxx::stdio_filebuf< _CharT, _Traits >::pos_type¶

This is a non-standard type.

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

Definition at line 54 of file stdio_filebuf.h.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> typedef _Traits __gnu_cxx::stdio_filebuf< _CharT, _Traits >::traits_type¶

This is a non-standard type.

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

Definition at line 52 of file stdio_filebuf.h.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf () [inline] deferred initialization¶

Definition at line 62 of file stdio_filebuf.h.

template<typename _CharT , typename _Traits > __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf (int __fd, std::ios_base::openmode __mode, size_t __size = static_cast<size_t>(BUFSIZ)) [inline] Parameters:¶

This constructor associates a file stream buffer with an open POSIX file descriptor. The file descriptor will be automatically closed when the stdio_filebuf is closed/destroyed.

Definition at line 124 of file stdio_filebuf.h.

References std::basic_filebuf< _CharT, _Traits >::_M_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), and std::basic_filebuf< _CharT, _Traits >::is_open().

template<typename _CharT , typename _Traits > __gnu_cxx::stdio_filebuf< _CharT, _Traits >::stdio_filebuf (std::__c_file * __f, std::ios_base::openmode __mode, size_t __size = static_cast<size_t>(BUFSIZ)) [inline] Parameters:¶

This constructor associates a file stream buffer with an open C FILE*. The FILE* will not be automatically closed when the stdio_filebuf is closed/destroyed.

Definition at line 140 of file stdio_filebuf.h.

References std::basic_filebuf< _CharT, _Traits >::_M_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), and std::basic_filebuf< _CharT, _Traits >::is_open().

template<typename _CharT , typename _Traits > __gnu_cxx::stdio_filebuf< _CharT, _Traits >::~stdio_filebuf () [inline, virtual] Closes the external data stream if the file descriptor constructor was used.¶

Definition at line 119 of file stdio_filebuf.h.

template<typename _CharT, typename _Traits> void std::basic_filebuf< _CharT, _Traits >::_M_create_pback () [inline, protected, inherited] Initializes pback buffers, and moves normal buffers to safety. Assumptions: _M_in_cur has already been moved back¶

Definition at line 172 of file fstream.

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

template<typename _CharT, typename _Traits> void std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback () throw () [inline, protected, inherited] Deactivates pback buffer contents, and restores normal buffer. Assumptions: The pback buffer has only moved forward.¶

Definition at line 189 of file fstream.

Referenced by std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekpos(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

template<typename _CharT, typename _Traits> void std::basic_filebuf< _CharT, _Traits >::_M_set_buffer (streamsize __off) [inline, protected, inherited] 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 386 of file fstream.

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

template<typename _CharT , typename _Traits > basic_filebuf< _CharT, _Traits >::__filebuf_type * std::basic_filebuf< _CharT, _Traits >::close () [inline, inherited]¶

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 128 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::is_open().

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

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::eback () const [inline, protected, inherited]¶

Access to the get area. These functions are only available to other protected functions, including derived classes.

• 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 458 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 >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::egptr () const [inline, protected, inherited]¶

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 464 of file streambuf.

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

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::epptr () const [inline, protected, inherited]¶

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 511 of file streambuf.

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

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> int __gnu_cxx::stdio_filebuf< _CharT, _Traits >::fd () [inline] Returns:¶

Once associated with an external data stream, this function can be used to access the underlying POSIX file descriptor. Note that there is no way for the library to track what you do with the descriptor, so be careful.

Definition at line 105 of file stdio_filebuf.h.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> std::__c_file* __gnu_cxx::stdio_filebuf< _CharT, _Traits >::file () [inline] Returns:¶

This function can be used to access the underlying 'C' file pointer. Note that there is no way for the library to track what you do with the file, so be careful.

Definition at line 115 of file stdio_filebuf.h.

template<typename _CharT, typename _Traits> void std::basic_streambuf< _CharT, _Traits >::gbump (int __n) [inline, protected, inherited]¶

Moving the read position. Parameters:

This just advances the read position without returning any data.

Definition at line 474 of file streambuf.

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

template<typename _CharT, typename _Traits> locale std::basic_streambuf< _CharT, _Traits >::getloc () const [inline, inherited]¶

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 221 of file streambuf.

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::gptr () const [inline, protected, inherited]¶

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 461 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 >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

template<typename _CharT , typename _Traits > void std::basic_filebuf< _CharT, _Traits >::imbue (const locale &) [inline, protected, virtual, inherited]¶

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:

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

Definition at line 855 of file fstream.tcc.

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

template<typename _CharT, typename _Traits> streamsize std::basic_streambuf< _CharT, _Traits >::in_avail () [inline, inherited]¶

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 261 of file streambuf.

template<typename _CharT, typename _Traits> bool std::basic_filebuf< _CharT, _Traits >::is_open () const throw () [inline, inherited]¶

Returns true if the external file is open.

Definition at line 222 of file fstream.

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

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

Opens an external file. Parameters:

Returns:

Definition at line 275 of file fstream.

Referenced by std::basic_filebuf< char_type, traits_type >::open().

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

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 94 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), std::ios_base::ate, std::basic_filebuf< _CharT, _Traits >::close(), std::ios_base::end, std::basic_filebuf< _CharT, _Traits >::is_open(), and std::basic_filebuf< _CharT, _Traits >::seekoff().

template<typename _CharT , typename _Traits > basic_filebuf< _CharT, _Traits >::int_type std::basic_filebuf< _CharT, _Traits >::overflow (int_type = _Traits::eof()) [inline, protected, virtual, inherited]¶

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:

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

Definition at line 408 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::_M_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), 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 std::basic_filebuf< _CharT, _Traits >::sync().

template<typename _CharT , typename _Traits > basic_filebuf< _CharT, _Traits >::int_type std::basic_filebuf< _CharT, _Traits >::pbackfail (int_type = _Traits::eof()) [inline, protected, virtual, inherited]¶

Tries to back up the input sequence. Parameters:

Returns:

Postcondition:

Note:

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

Definition at line 356 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::_M_create_pback(), std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_pback_init, std::basic_filebuf< _CharT, _Traits >::_M_reading, 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, std::basic_filebuf< _CharT, _Traits >::seekoff(), and std::basic_filebuf< _CharT, _Traits >::underflow().

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::pbase () const [inline, protected, inherited]¶

Access to the put area. These functions are only available to other protected functions, including derived classes.

• 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 505 of file streambuf.

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

template<typename _CharT, typename _Traits> void std::basic_streambuf< _CharT, _Traits >::pbump (int __n) [inline, protected, inherited]¶

Moving the write position. Parameters:

This just advances the write position without returning any data.

Definition at line 521 of file streambuf.

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

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::pptr () const [inline, protected, inherited]¶

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 508 of file streambuf.

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

template<typename _CharT, typename _Traits> locale std::basic_streambuf< _CharT, _Traits >::pubimbue (const locale & __loc) [inline, inherited]¶

Entry point for imbue(). Parameters:

Returns:

Calls the derived imbue(loc).

Definition at line 204 of file streambuf.

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) [inline, inherited]¶

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 238 of file streambuf.

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) [inline, inherited]¶

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 243 of file streambuf.

template<typename _CharT, typename _Traits> __streambuf_type* std::basic_streambuf< _CharT, _Traits >::pubsetbuf (char_type * __s, streamsize __n) [inline, inherited]¶

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 234 of file streambuf.

template<typename _CharT, typename _Traits> int std::basic_streambuf< _CharT, _Traits >::pubsync () [inline, inherited]¶

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 248 of file streambuf.

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

template<typename _CharT, typename _Traits> int_type std::basic_streambuf< _CharT, _Traits >::sbumpc () [inline, inherited]¶

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 293 of file streambuf.

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

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) [inline, protected, virtual, inherited]¶

Alters the stream positions. Each derived class provides its own appropriate behavior.

Note:

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

Definition at line 686 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback(), std::basic_filebuf< _CharT, _Traits >::_M_ext_buf, std::basic_filebuf< _CharT, _Traits >::_M_ext_next, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::ios_base::cur, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gptr(), and std::basic_filebuf< _CharT, _Traits >::is_open().

Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::open(), and std::basic_filebuf< _CharT, _Traits >::pbackfail().

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) [inline, protected, virtual, inherited]¶

Alters the stream positions. Each derived class provides its own appropriate behavior.

Note:

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

Definition at line 739 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback(), std::ios_base::beg, and std::basic_filebuf< _CharT, _Traits >::is_open().

template<typename _CharT , typename _Traits > basic_filebuf< _CharT, _Traits >::__streambuf_type * std::basic_filebuf< _CharT, _Traits >::setbuf (char_type * __s, streamsize __n) [inline, protected, virtual, inherited]¶

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

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

Definition at line 657 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::_M_buf, std::basic_filebuf< _CharT, _Traits >::_M_buf_size, and std::basic_filebuf< _CharT, _Traits >::is_open().

template<typename _CharT, typename _Traits> void std::basic_streambuf< _CharT, _Traits >::setg (char_type * __gbeg, char_type * __gnext, char_type * __gend) [inline, protected, inherited]¶

Setting the three read area pointers. Parameters:

Postcondition:

Definition at line 485 of file streambuf.

template<typename _CharT, typename _Traits> void std::basic_streambuf< _CharT, _Traits >::setp (char_type * __pbeg, char_type * __pend) [inline, protected, inherited]¶

Setting the three write area pointers. Parameters:

Postcondition:

Definition at line 531 of file streambuf.

template<typename _CharT, typename _Traits> int_type std::basic_streambuf< _CharT, _Traits >::sgetc () [inline, inherited]¶

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 315 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 >::sentry::sentry().

template<typename _CharT, typename _Traits> streamsize std::basic_streambuf< _CharT, _Traits >::sgetn (char_type * __s, streamsize __n) [inline, inherited]¶

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 334 of file streambuf.

template<typename _CharT , typename _Traits > streamsize std::basic_filebuf< _CharT, _Traits >::showmanyc () [inline, protected, virtual, inherited]¶

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:

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

Definition at line 178 of file fstream.tcc.

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

template<typename _CharT, typename _Traits> int_type std::basic_streambuf< _CharT, _Traits >::snextc () [inline, inherited]¶

Getting the next character. Returns:

Calls sbumpc(), and if that function returns traits::eof(), so does this function. Otherwise, sgetc().

Definition at line 275 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 >::sentry::sentry().

template<typename _CharT, typename _Traits> int_type std::basic_streambuf< _CharT, _Traits >::sputbackc (char_type __c) [inline, inherited]¶

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 348 of file streambuf.

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

template<typename _CharT, typename _Traits> int_type std::basic_streambuf< _CharT, _Traits >::sputc (char_type __c) [inline, inherited]¶

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 400 of file streambuf.

Referenced by std::basic_istream< _CharT, _Traits >::get(), and std::ostreambuf_iterator< _CharT, _Traits >::operator=().

template<typename _CharT, typename _Traits> streamsize std::basic_streambuf< _CharT, _Traits >::sputn (const char_type * __s, streamsize __n) [inline, inherited]¶

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 426 of file streambuf.

template<typename _CharT, typename _Traits> void std::basic_streambuf< _CharT, _Traits >::stossc () [inline, inherited]¶

Tosses a character. Advances the read pointer, ignoring the character that would have been read.

See http://gcc.gnu.org/ml/libstdc++/2002-05/msg00168.html

Definition at line 758 of file streambuf.

template<typename _CharT, typename _Traits> int_type std::basic_streambuf< _CharT, _Traits >::sungetc () [inline, inherited]¶

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 373 of file streambuf.

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

template<typename _CharT , typename _Traits > int std::basic_filebuf< _CharT, _Traits >::sync () [inline, protected, virtual, inherited]¶

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 838 of file fstream.tcc.

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

template<typename _CharT, typename _Traits> virtual int_type std::basic_streambuf< _CharT, _Traits >::uflow () [inline, protected, virtual, inherited]¶

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 676 of file streambuf.

template<typename _CharT , typename _Traits > basic_filebuf< _CharT, _Traits >::int_type std::basic_filebuf< _CharT, _Traits >::underflow () [inline, protected, virtual, inherited]¶

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 http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25.html

Note:

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

Definition at line 204 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::_M_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback(), std::basic_filebuf< _CharT, _Traits >::_M_ext_buf, std::basic_filebuf< _CharT, _Traits >::_M_ext_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_ext_next, std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::in(), std::ios_base::in, and std::min().

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

template<typename _CharT , typename _Traits > streamsize std::basic_filebuf< _CharT, _Traits >::xsgetn (char_type * __s, streamsize __n) [inline, protected, virtual, inherited]¶

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 527 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::_M_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_destroy_pback(), std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_pback_init, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_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, and std::basic_streambuf< char_type, traits_type >::xsgetn().

template<typename _CharT , typename _Traits > streamsize std::basic_filebuf< _CharT, _Traits >::xsputn (const char_type * __s, streamsize __n) [inline, protected, virtual, inherited]¶

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 610 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::_M_buf_size, std::basic_filebuf< _CharT, _Traits >::_M_mode, std::basic_filebuf< _CharT, _Traits >::_M_reading, std::basic_filebuf< _CharT, _Traits >::_M_set_buffer(), std::basic_streambuf< _CharT, _Traits >::epptr(), std::min(), 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().

template<typename _CharT, typename _Traits> char_type* std::basic_filebuf< _CharT, _Traits >::_M_buf [protected, inherited]¶

Pointer to the beginning of internal buffer.

Definition at line 109 of file fstream.

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

template<typename _CharT, typename _Traits> locale std::basic_streambuf< _CharT, _Traits >::_M_buf_locale [protected, inherited]¶

Current locale setting.

Definition at line 187 of file streambuf.

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

template<typename _CharT, typename _Traits> size_t std::basic_filebuf< _CharT, _Traits >::_M_buf_size [protected, inherited] 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 116 of file fstream.

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

template<typename _CharT, typename _Traits> char* std::basic_filebuf< _CharT, _Traits >::_M_ext_buf [protected, inherited] Buffer for external characters. Used for input when codecvt::always_noconv() == false. When valid, this corresponds to eback().¶

Definition at line 151 of file fstream.

Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::seekoff(), and std::basic_filebuf< _CharT, _Traits >::underflow().

template<typename _CharT, typename _Traits> streamsize std::basic_filebuf< _CharT, _Traits >::_M_ext_buf_size [protected, inherited] Size of buffer held by _M_ext_buf.¶

Definition at line 156 of file fstream.

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

template<typename _CharT, typename _Traits> const char* std::basic_filebuf< _CharT, _Traits >::_M_ext_next [protected, inherited] 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 163 of file fstream.

Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::seekoff(), and std::basic_filebuf< _CharT, _Traits >::underflow().

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_beg [protected, inherited] 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 179 of file streambuf.

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_cur [protected, inherited]¶

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 180 of file streambuf.

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::_M_in_end [protected, inherited]¶

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 181 of file streambuf.

template<typename _CharT, typename _Traits> ios_base::openmode std::basic_filebuf< _CharT, _Traits >::_M_mode [protected, inherited]¶

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

Definition at line 94 of file fstream.

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

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_beg [protected, inherited]¶

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 182 of file streambuf.

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_cur [protected, inherited]¶

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 183 of file streambuf.

template<typename _CharT, typename _Traits> char_type* std::basic_streambuf< _CharT, _Traits >::_M_out_end [protected, inherited]¶

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 184 of file streambuf.

template<typename _CharT, typename _Traits> char_type std::basic_filebuf< _CharT, _Traits >::_M_pback [protected, inherited] Necessary bits for putback buffer management.¶

Note:

Definition at line 137 of file fstream.

template<typename _CharT, typename _Traits> char_type* std::basic_filebuf< _CharT, _Traits >::_M_pback_cur_save [protected, inherited] Necessary bits for putback buffer management.¶

Note:

Definition at line 138 of file fstream.

template<typename _CharT, typename _Traits> char_type* std::basic_filebuf< _CharT, _Traits >::_M_pback_end_save [protected, inherited] Necessary bits for putback buffer management.¶

Note:

Definition at line 139 of file fstream.

template<typename _CharT, typename _Traits> bool std::basic_filebuf< _CharT, _Traits >::_M_pback_init [protected, inherited] Necessary bits for putback buffer management.¶

Note:

Definition at line 140 of file fstream.

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

template<typename _CharT, typename _Traits> bool std::basic_filebuf< _CharT, _Traits >::_M_reading [protected, inherited] _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 128 of file fstream.

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