Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!uakari.primate.wisc.edu!xanth!kremer
From: kremer@cs.odu.edu (Lloyd Kremer)
Newsgroups: comp.lang.c
Subject: Re: Function pointers.. help!
Summary: external declaration may be required
Message-ID: <10183@xanth.cs.odu.edu>
Date: 13 Oct 89 16:28:50 GMT
References: <3005@ndsuvax.UUCP>
Organization: Old Dominion University, Norfolk, Va.
Lines: 34


In article <3005@ndsuvax.UUCP> nebakke@ndsuvax.UUCP (Jeff Bakke) writes:

>say I have a function pointer defined:
>void (*border_proc)();  
>Ok, now I want a function to be called as
>Assign_border(myfunction);
>Where myfunction is a function name.
>Now the assign_border function
>is declared as 
>void Assign_border(void (*user_border)()){
>
>   border_proc = user_border;
>}
>
>Now, to me, this seems alright, but to the  Turbo c 2.0 compiler, it
>says that a Storage class is required.


The code seems basically all right.  Maybe the Assign_border function doesn't
know what border_proc is.  This could be the case if border_proc's definition
were in another file or occurred before the Assign_border function.

Try
	extern void (*border_proc)();
	/* extern could be the missing storage class */
	border_proc = user_border;

as the contents of Assign_border().

-- 
					Lloyd Kremer
					...!uunet!xanth!kremer
					Have terminal...will hack!