Creating pointer with all bits 0 (was: Referencing NULL pointers)

[Doug Gwyn]

In article <1989Sep6.052228.17374 at algor2.algorists.com> jeffrey at algor2.UUCP (Jeffrey Kegler) writes:
>If I am correct, this could cause problems.  It is not hard to imagine
>an implementation where every possible pointer bit pattern is a valid
>physical address.  No pattern would remain for the null pointer.

I've already explained how an implementation could provide a null
pointer anyway, by using a datum in the run-time library whose address
would be used for null pointers.