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From: "Daniel C. Wang" <danwan...@hotmail.com>
Newsgroups: comp.lang.lisp,comp.lang.functional
Subject: Re: Sum types (Was: Re: OT: More Antilock brakes)
Date: 05 Dec 2003 00:31:20 -0500
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Christopher Jeris <cje...@fake.address.us> writes:

> cesuraS...@verizon.net (William D Clinger) writes:
> > This is untrue.  As noted in a previous post, I would not use instanceof
> > for pattern matching in Java.  If you do not understand how to avoid the
> > use of instanceof, then let's start a new thread on that topic.
> 
> Okay, I'm a novice everything, but curious:  Manually put a type-tag
> field in the direct superclass of your summands, and dispatch on that?
> (If that's a blazingly stupid way to do it, please don't understand me
> to impute such stupidity to you!)

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