Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!uw-june!ka
From: ka@june.cs.washington.edu (Kenneth Almquist)
Newsgroups: comp.lang.c
Subject: Re: Recursive #includes
Keywords: recursive includes, modularity
Message-ID: <7488@june.cs.washington.edu>
Date: 6 Mar 89 11:12:10 GMT
References: <570@marob.MASA.COM> <9727@smoke.BRL.MIL> <964@philmds.UUCP> <3804@xyzzy.UUCP>
Organization: U of Washington, Computer Science, Seattle
Lines: 23

In article <3804@xyzzy.UUCP>, throopw@agarn.dg.com (Wayne A. Throop) writes:
> But note that each module only needs to be able to declare a pointer
> to the other's type.  In C, this can be done using incompleted types.
> (See section 3.5.2.3 of pANS, and especially footnote 48 of that
> section.)

I've been told that incomplete types cannot be used in function
prototypes.  For example,

	void f(struct s *);

	struct s {
		int i;
	};

	void f(struct s *p) {
		...
	}

is illegal because s is not defined when the function prototype for
f is processed.  If so, this makes Wayne's suggestion pretty useless.
Have I been misinformed?
				Kenneth Almquist