Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!husc6!cmcl2!brl-adm!adm!jfjr@mitre-bedford.arpa
From: jfjr@mitre-bedford.arpa
Newsgroups: comp.lang.c
Subject: Can this be done
Message-ID: <8125@brl-adm.ARPA>
Date: Wed, 1-Jul-87 14:40:20 EDT
Article-I.D.: brl-adm.8125
Posted: Wed Jul  1 14:40:20 1987
Date-Received: Fri, 3-Jul-87 01:45:56 EDT
Sender: news@brl-adm.ARPA
Lines: 27


 I posted this sometime back but it appears to have been lost
so I am posting it again. If its redundant I have screwed up and
I apologize.

 Suppose I have defined a structure type with one of the components
a pointer to a function. For simplicity's sake the function takes
no parameters and returns void. Suppose further I declare, in
one module an array of such structures and in that same module
(compilation unit) I define(declare??) a function we'll call
"install" which takes a one of these function pointer structures
as a parameter, searches through the array for an empty spot
and copies the structure into it.

 Now, in another, separate module I have an instance of my
function pointer structure and the function (call it my_function)
it points to is also in this module. I make NO attempt to make 
this function visible outside the module. I make "install"
visible and in fact I call it to install this structure 
into the array described above. Can I loop through my array
and call the functions in it even though none are declared 
external anywhere? is this legal? possible but not legal??
done every day?? - how far can I push this?? Any comments
are welcome

                                         Jerry Freedman,Jr
                                         jfjr@mitre-bedford.arpa