Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!usc!ucla-cs!heather
From: heather@maui.cs.ucla.edu (Heather Burris)
Newsgroups: comp.lang.c
Subject: Re: mutual reference in structures
Message-ID: <23608@shemp.CS.UCLA.EDU>
Date: 5 May 89 00:54:26 GMT
References: <6712@medusa.cs.purdue.edu>
Sender: news@CS.UCLA.EDU
Reply-To: heather@cs.ucla.edu (Heather Burris)
Organization: UCLA Computer Science Department
Lines: 30

In article <6712@medusa.cs.purdue.edu> bouma@cs.purdue.EDU (William J. Bouma) writes:
>Please tell me how to get C to accept the following or equivalent code:
>
>typedef union a {
>    b_ *pb;
>} a_;
>
>typedef struct b {
>    a_ va;
>} b_;
>
>
>-- 
>Bill <bouma@cs.purdue.edu>  ||  ...!purdue!bouma 

You cannot do forward references on typedefs.  You can, however,
on structure tags.  Therefore you can say:

typedef union a{
	struct b *pb;
}a_;

typedef struct b{
	a_ va;
}b_;

Note that the order of the above declarations is important because
I have not removed the typedef reference to typedef a_.  Have fun,

Heather Burris, UCLA