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From: johnson@p.cs.uiuc.edu
Newsgroups: comp.sw.components
Subject: Re: Inheritance vs. component effic
Message-ID: <130200009@p.cs.uiuc.edu>
Date: 23 Aug 89 13:55:00 GMT
References: <1233@ttds.UUCP>
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Nf-ID: #R:ttds.UUCP:1233:p.cs.uiuc.edu:130200009:000:683
Nf-From: p.cs.uiuc.edu!johnson    Aug 23 08:55:00 1989


Jonas Nygren shows that structures with pointers to functions
handle my windowing example very well, and says that this proves
that object-oriented programming can be simulated without case
statements and that run-time binding is not needed.

However, he proves my point.  Calling a function stored in a structure
IS run-time binding.  He is just showing how to do object-oriented
programming in C.  It is fine to do object-oriented programming in
C, and some people prefer that to using C++.  

Many, if not most, languages do not allow pointers to functions to
be stored in structures.  In particular, Ada does not.  In those
cases, you have to use case statements.

Ralph Johnson