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From: guy@sun.uucp (Guy Harris)
Newsgroups: comp.lang.c
Subject: Re: how do I initialize a function pointer to be NULL ?
Message-ID: <27825@sun.uucp>
Date: Sat, 12-Sep-87 21:09:54 EDT
Article-I.D.: sun.27825
Posted: Sat Sep 12 21:09:54 1987
Date-Received: Sun, 13-Sep-87 10:47:50 EDT
References: <197@tiger.Princeton.EDU> <27742@sun.uucp> <2236@emory.uucp>
Organization: Sun Microsystems, Inc. - Mtn View, CA
Lines: 14
Keywords: NULLFUNC

> Actually, depending on the model (the IBM machines have a segmented
> addressing scheme), NULL is defined as 0 if the memory is in small or
> medium models, and is defined as 0L in compact and large models.  
> Since a module may need to be compiled several ways,

The model in which the module is compiled is *completely irrelevant* in this
case, unless the compiler is broken.  The compiler is required to coerce 0
(yes, a 16-bit 0) into a large-model function pointer in a context where this
is called for by the language specification; an initialization counts as such
a context.
-- 
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy@sun.com (or guy@sun.arpa)