std::basic_filebuf< _CharT, _Traits > Class Template Reference

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

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List of all members.

Public Types

typedef _CharT char_type
typedef _Traits traits_type
typedef traits_type::int_type int_type
typedef traits_type::pos_type pos_type
typedef traits_type::off_type off_type

Public Methods

 basic_filebuf ()
 Does not open any files.

virtual ~basic_filebuf ()
 The destructor closes the file first.

bool is_open () const
 Returns true if the external file is open.

__filebuf_type * open (const char *__s, ios_base::openmode __mode)
 Opens an external file.

__filebuf_type * close ()
 Closes the currently associated file.


Protected Methods

virtual streamsize showmanyc ()
 Investigating the data available.

virtual int_type underflow ()
 Fetches more data from the controlled sequence.

virtual int_type uflow ()
 Fetches more data from the controlled sequence.

virtual int_type pbackfail (int_type __c=_Traits::eof())
 Tries to back up the input sequence.

virtual int_type overflow (int_type __c=_Traits::eof())
 Consumes data from the buffer; writes to the controlled sequence.

virtual __streambuf_type * setbuf (char_type *__s, streamsize __n)
 Manipulates the buffer.

virtual pos_type seekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in|ios_base::out)
 Alters the stream positions.

virtual pos_type seekpos (pos_type __pos, ios_base::openmode __mode=ios_base::in|ios_base::out)
 Alters the stream positions.

virtual int sync ()
 Synchronizes the buffer arrays with the controlled sequences.

virtual void imbue (const locale &__loc)
 Changes translations.

virtual streamsize xsgetn (char_type *__s, streamsize __n)
 Multiple character extraction.

virtual streamsize xsputn (const char_type *__s, streamsize __n)
 Multiple character insertion.


Detailed Description

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

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

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 sematics are described in terms of similar behavior in the Standard C Library's FILE streams.

Definition at line 63 of file fstream.


Member Typedef Documentation

template<typename _CharT, typename _Traits>
typedef _CharT std::basic_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_streambuf< _CharT, _Traits > .

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

Definition at line 67 of file fstream.

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

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

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

Definition at line 69 of file fstream.

Referenced by std::basic_filebuf< _CharT, _Traits >::close() , std::basic_filebuf< _CharT, _Traits >::overflow() , std::basic_filebuf< _CharT, _Traits >::pbackfail() , and std::basic_filebuf< _CharT, enc_char_traits< _CharT > >::uflow() .

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

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

Definition at line 71 of file fstream.

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

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

These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.

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

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

Definition at line 70 of file fstream.

Referenced by std::basic_filebuf< _CharT, _Traits >::seekoff() , and std::basic_filebuf< _CharT, enc_char_traits< _CharT > >::uflow() .

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

These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.

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

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

Definition at line 68 of file fstream.


Constructor & Destructor Documentation

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 75 of file fstream.tcc.

template<typename _CharT, typename _Traits>
virtual std::basic_filebuf< _CharT, _Traits >::~basic_filebuf   [inline, virtual]
 

The destructor closes the file first.

Definition at line 157 of file fstream.


Member Function Documentation

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 117 of file fstream.tcc.

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

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

template<typename _CharT, typename _Traits>
void std::basic_filebuf< _CharT, _Traits >::imbue const locale &    __loc [protected, virtual]
 

Changes translations.

Parameters:
loc A 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." This function simply stores the new locale for use by derived classes.

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

Definition at line 469 of file fstream.tcc.

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

template<typename _CharT, typename _Traits>
bool std::basic_filebuf< _CharT, _Traits >::is_open   const [inline]
 

Returns true if the external file is open.

Definition at line 168 of file fstream.

Referenced by std::basic_filebuf< _CharT, _Traits >::close() , std::basic_filebuf< _CharT, _Traits >::open() , std::basic_filebuf< _CharT, _Traits >::seekoff() , 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>
basic_filebuf< _CharT, _Traits >::__filebuf_type * std::basic_filebuf< _CharT, _Traits >::open const char *    __s,
ios_base::openmode    __mode
 

Opens an external file.

Parameters:
s The name of the file.
mode The 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 gives the relation between openmode combinations and the equivalent fopen() flags, but the table has not been copied yet.]

Definition at line 83 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::close() , std::basic_filebuf< _CharT, _Traits >::is_open() , std::basic_filebuf< _CharT, _Traits >::seekoff() , and std::basic_filebuf< _CharT, _Traits >::underflow() .

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

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

Parameters:
c An 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 definiton of this function, see a good text such as Langer & Kreft, or [27.5.2.4.5]/3-7.

A functioning output streambuf can be created by overriding only this function (no buffer area will be used).

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

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

Definition at line 235 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::int_type .

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

Tries to back up the input sequence.

Parameters:
c The 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 167 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::char_type , std::basic_filebuf< _CharT, _Traits >::int_type , std::basic_filebuf< _CharT, _Traits >::seekoff() , and std::basic_filebuf< _CharT, _Traits >::underflow() .

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::pos_type std::basic_filebuf< _CharT, _Traits >::seekoff off_type    __off,
ios_base::seekdir    __way,
ios_base::openmode    __mode = ios_base::in | ios_base::out
[protected, virtual]
 

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 398 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::is_open() , std::max() , std::basic_filebuf< _CharT, _Traits >::off_type , std::basic_filebuf< _CharT, _Traits >::pos_type , and std::basic_filebuf< _CharT, _Traits >::sync() .

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

template<typename _CharT, typename _Traits>
basic_filebuf< _CharT, _Traits >::pos_type std::basic_filebuf< _CharT, _Traits >::seekpos pos_type    __pos,
ios_base::openmode    __mode = ios_base::in | ios_base::out
[protected, virtual]
 

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 452 of file fstream.tcc.

References std::basic_filebuf< _CharT, _Traits >::off_type , and std::basic_filebuf< _CharT, _Traits >::seekoff() .

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

Manipulates the buffer.

Parameters:
s Pointer to a buffer area.
n Size of s.
Returns:
this
If no file has been opened, and both s and n are zero, then the stream becomes unbuffered. Otherwise, s is used as a buffer; see http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2 for more.

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

Definition at line 373 of file fstream.tcc.

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

template<typename _CharT, typename _Traits>
streamsize std::basic_filebuf< _CharT, _Traits >::showmanyc   [protected, virtual]
 

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 153 of file fstream.tcc.

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

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

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 323 of file fstream.

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

template<typename _CharT, typename _Traits>
virtual int_type std::basic_filebuf< _CharT, _Traits >::uflow   [inline, protected, virtual]
 

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 from std::basic_streambuf< _CharT, _Traits > .

Definition at line 250 of file fstream.

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

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 definiton of the pending sequence, see a good text such as Langer & Kreft, or [27.5.2.4.3]/7-14.

A functioning input streambuf can be created by overriding only this function (no buffer area will be used). For an example, see http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#6

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

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

Definition at line 246 of file fstream.

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

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

Multiple character extraction.

Parameters:
s A buffer area.
n Maximum 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 349 of file fstream.

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

Multiple character insertion.

Parameters:
s A buffer area.
n Maximum 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 371 of file fstream.


The documentation for this class was generated from the following files:
Generated on Thu Nov 21 03:13:22 2002 for libstdc++-v3 Source by doxygen1.2.18-20021030