void delbuf( int nDelFlag );
int delbuf() const;
nDelFlag
A nonzero value indicates that ~ios should delete the stream's attached streambuf object. A 0 value prevents deletion.
The first overloaded delbuf function assigns a value to the stream's buffer-deletion flag.
The second function returns the current value of the flag.
This function is public only because it is accessed by the Iostream_init class. Treat it as protected.
ios::rdbuf, ios::~ios