help : _IO_IN_BACKUP flag or g++ lib api reference

[Douglas Forman <dforman at my-deja dot com>]

Please help me answer this question, or possibly point me to
a good resource for g++ api documentation.

 I'm trying to find out how the _IO_IN_BACKUP flag,
which is part of the IO_FILE structure defined in libio.h
is used.

I would like to use it as an "archive bit".

I saw it used in ./g++-2/streambuf.h in the function:gptr

char* gptr() const
      { return _IO_file_flags & _IO_IN_BACKUP ? _IO_save_base :
_IO_read_ptr; }


Anybody know how this is used?

Thanks in advance,
--
Requards,
Douglas Forman


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