Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!sm.unisys.com!ism780c!haddock!karl
From: karl@haddock.ima.isc.com (Karl Heuer)
Newsgroups: comp.lang.c
Subject: Re: Recursive #includes
Keywords: recursive includes, modularity
Message-ID: <11959@haddock.ima.isc.com>
Date: 6 Mar 89 19:56:40 GMT
References: <570@marob.MASA.COM> <9727@smoke.BRL.MIL> <964@philmds.UUCP> <3804@xyzzy.UUCP> <7488@june.cs.washington.edu>
Reply-To: karl@haddock.ima.isc.com (Karl Heuer)
Organization: Interactive Systems, Boston
Lines: 13

In article <7488@june.cs.washington.edu> ka@june.cs.washington.edu (Kenneth Almquist) writes:
>I've been told that incomplete types cannot be used in function
>prototypes.  For example,
>	void f(struct s *);
>	struct s { ... };
>	void f(struct s *p) { ... }
>is illegal ...

Yes it is illegal, but due to a scoping problem, not a restriction against
incomplete types.  Adding the empty declaration `struct s;' at the top should
cause it to become legal.  (I just tested this with gcc.)

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