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The arguments of this chapter, when it first appeared, really seemed to get people going ... I received an unusually large number of responses, responses that were almost universally unclear, badly expressed, and confused (though it was at least clear that they were mostly quite critical of my position and arguments). I ve quoted several passages from those letters and messages at length in what follows (verbatim I haven t attempted to correct the originals in any way), and I think the passages in question will give you some idea of what I mean.
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The first response, by LH, was forwarded to me by JM, who described LH s message as a cogent response to my complaints that the object world mostly seems to think a circle isn t an ellipse. Well, my dictionary defines cogent as powerful, convincing, and I don t think LH s argument is even close to being either. And I think a large part of the problem is precisely that LH is talking object talk ; he or she never addresses my complaint that the object concept is both redundant and unnecessarily confusing, not least when we re trying to resolve the particular issue at hand. In fact, LH never really addresses any of the arguments I was making in my original article. He or she does seem to say it s unwise to treat a circle as an ellipse in
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CHAPTER 23 IS A CIRCLE AN ELLIPSE
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C++ specifically (actually LH talks in terms of squares and rectangles, not circles and ellipses, but the examples are isomorphic, of course). Well, maybe it is unwise; but if so, then that s a problem with C++ specifically, it s not an argument for saying that circles should never (or almost never ) be treated as ellipses. That a square is a rectangle is true enough in carefully written code : I don t think code, carefully written or otherwise, has anything to do with the matter. In fact, the argument that code should dictate whether or not a circle is an ellipse seems to me to be 100 percent backward. A circle is an ellipse, and if your code doesn t support that fact, then there s something wrong with your code. By the way, treating circles as ellipses is not only logically correct, it s positively desirable in the context of (at least) spatial or temporal data. Furthermore (as noted in the body of the chapter), Hugh Darwen and I not only think we know how to do it, we think we know how to do it efficiently.
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Here are some quotes from a series of responses, all from the same person: I m not surprised that Dr. S had problems with [the circles and ellipses article] ... Chris Date ... makes two fundamental errors with this article, these stopped me reading less than half the way through. I ll reserve judgment on this extract until we find out what the alleged errors are (see later). As a quick point a class is a programming level realization of a type. If in ooa you specify the classification type and some of its properties this could be modelled in any number of ways in any number of languages (of course also non oop s). A class in most oop s refers to the code itself that is a template for instantiation of behaviour ... (As a follow on an object is most often an instantiation of a class, oop language terms vary of course.) As I pointed out in my original article as clearly as I could! there s no consensus on what a class is and what a type is. For the purposes of that article, I said I was going to take the terms as synonymous. I don t want to quibble over terminology; the concepts are what I m interested in, and playing games with the terms doesn t invalidate any of the points I tried to make. [The first error:] In basing your criticism on the C++ paragraph you miss the context. This is talking about implementation issues NOT about pure theory. Yes people recognise that circles are special kinds of ellipses, the point is within a programming context HOW do you model this, NOT wether outside of this context it is correct. I couldn t disagree more. The context was a chapter called Development and Design, and the section I was quoting was headed Step 1: Find Classes. We re trying to find classes (= types!) that are useful for the database and/or application at hand. And I would strongly suggest that if we think we want some classes called ELLIPSE and CIRCLE, then those classes had jolly well better correspond pretty closely to ellipses and circles, not to something that just happens to be a little bit like ellipses and circles. Frankly, it doesn t seem to me that my position here should even need defending; I find it amazing that some people would want to attack it. By the way, I can t resist pointing out that the passage quoted includes a use of the verb to model that is clearly intended to be understood as to implement. See my paper Models, Models, Everywhere, Nor Any Time to Think ( 25 in the present book).
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