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From: karl@haddock.ima.isc.com (Karl Heuer)
Newsgroups: comp.lang.c
Subject: Re: void * compatibility
Keywords: C void types
Message-ID: <18080@haddock.ima.isc.com>
Date: 20 Sep 90 03:44:38 GMT
References: <8770@b11.ingr.com>
Reply-To: karl@haddock.ima.isc.com (Karl Heuer)
Distribution: usa
Organization: Interactive Systems, Cambridge, MA 02138-5302
Lines: 14

In article <8770@b11.ingr.com> polfer@b11.ingr.com (? Polfer) writes:
>    int (**command)();
>    *command = NULL;
>    "Type `void *' is not assignment compatible with type `int (*)()'."
>isn't a "void *" supposed to be assignment compatible with ALL pointers?

No, it's compatible with all *data* pointers.  Function pointers need not fit
in a `void *'.

But (as Chris Torek already pointed out), a null pointer constant is a special
case.  Your compiler has a bug in that it apparently fails to recognize the
`(void *)0' form as a null pointer constant.

Karl W. Z. Heuer (karl@kelp.ima.isc.com or ima!kelp!karl), The Walking Lint