streambuf::setbuf
virtual streambuf* setbuf( char* pr**, int** nLength );
Return Value
A streambuf pointer if the buffer is accepted; otherwise NULL.
Parameters
pr
A pointer to a previously allocated reserve area of length nLength. A NULL value indicates an unbuffered stream.
nLength
The length (in bytes) of the reserve area. A length of 0 indicates an unbuffered stream.
Remarks
Attaches the specified reserve area to the streambuf object. Derived classes may or may not use this area.
Default Implementation
Accepts the request if there is not a reserved area already.