From owner-freebsd-arch  Tue Aug 20 17:21:28 2002
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Date: Tue, 20 Aug 2002 17:21:16 -0700
From: "David O'Brien" <obrien@freebsd.org>
To: Archie Cobbs <archie@dellroad.org>
Cc: freebsd-arch@freebsd.org
Subject: Re: NULL
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On Tue, Aug 20, 2002 at 04:44:50PM -0700, Archie Cobbs wrote:
> Simple question...
> Why isn't NULL defined to be "((void *)0)" instead of "0" ?

In C++ this is not legal:

    void blah(void) {
        int *foo;
        void *bar;
        bar = foo;
        foo = bar;
    }

it is in C, but we share the definition.
A benefit of "(void *)0" is that this would be caught:

    char c = NULL;

rather than the correct:
    char c = '\0';

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