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October 1998, Week 4

HP3000-L@RAVEN.UTC.EDU

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Wed, 28 Oct 1998 16:19:57 -0700
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Walter Murray writes:

>[Bruce Toback wrote:]
>: The LHS, not the RHS of [a C] expression
>: can be a pointer to void. You can't assign a pointer to void to any other
>: kind of pointer without an explicit cast, but you can assign any pointer
>: type to a pointer to void. (Think about void * parameters, for example.)

>Well, actually, you CAN assign a pointer-to-void to another
>pointer without using a cast.  For example, given (void *vp)
>and (int *ip), it is perfectly legal to assign (ip=vp).

Walter is correct -- any pointer type can be converted from void except a
function pointer. C++ has the tighter rule (ARM 4.6) that I mistakenly
thought applied to C as well.

Sorry about that.

-- Bruce


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