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From: walter@hpclwjm.HP.COM (Walter Murray)
Newsgroups: comp.lang.c
Subject: Re: forward references in typedefs
Message-ID: <660045@hpclwjm.HP.COM>
Date: 20 Jul 89 19:03:16 GMT
References: <55480@tut.cis.ohio-state.edu>
Organization: Hewlett-Packard Calif. Language Lab
Lines: 32

George M. Jones writes:

>   typedef struct one
>     {
>       two_t *foo;
>     } one_t;
>   typedef struct two
>     {
>       one_t *bar;
>     } two_t;

This code is incorrect by the syntax rules of ANSI C.  The identifier
'two_t' by itself is not a valid type-specifier in the declaration
of 'foo', unless it has previously been defined as a typedef name.

This is probably what you want:

  typedef struct one one_t;
  typedef struct two two_t;
  struct one
    {
      two_t *foo;
    } ;
  struct two
    {
      one_t *bar;
    } ;

Walter Murray
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Not speaking for Hewlett-Packard or X3J11
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