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Date: 12 Mar 88 20:30:21 GMT
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Subject:  Re: Header problems

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From:         Mark Brader <msb@sq.uucp>
Subject:      Re: Header problems
Comments: To: info-c@brl-smoke.arpa
To:           Vic Kapella <SXJVK@ALASKA>

> By the way, if you call f(0) where f expects a char *, the requirement
> for it to work is not simply that sizeof(int) == sizeof(char *), but
> also that (int)0 and (char *)0 have the same bit representation.

*And* that the implementation passes integer and pointer type values to
functions in the same manner.  Remember, arguments can be passed in registers
and machines can have several types of registers.

*Never* say f(0) or f(NULL).

Mark Brader, SoftQuad Inc., Toronto, utzoo!sq!msb, msb@sq.com
#define    MSB(type)    (~(((unsigned type)-1)>>1))