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And then of course, I would have to agree that CIRCLE isn t a subtype of (this redefined version of) type ELLIPSE The question then becomes: Is the foregoing revision to the definition of type ELLIPSE useful Well, KU doesn t mention any types apart from CIRCLE and that redefined version of ELLIPSE; so if these are the only types we have, we clearly lose value substitutability I mean, we wouldn t be able to substitute a value of type CIRCLE wherever the system expected a value of type ELLIPSE Thus, for example, we couldn t have a single AREA operator that computes the area of a general ellipse and can thus be applied, thanks to subtyping and inheritance, to a circle in particular (And so we would lose some code reuse, too.

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change the default values, use the External Tools dialog box to modify the MSBuild external tool definition. As you specify these values, keep in mind that this will be the same for every instance of Visual Studio. Because of this, many times it is inappropriate to specify a default target, unless it is a common one such as Build. After you have decided what arguments to specify, click the OK button, and your build will begin. Since you checked the Use Output Window box, all of the output from MSBuild will be redirected to the Output window inside Visual Studio. After executing this task, you will see the Output window shown in Figure 3-11.

) (Still assuming the revised definition of type ELLIPSE:) Of course, we could go on to define a type hierarchy in which ELLIPSE and CIRCLE are distinct immediate subtypes of the same supertype (which might perhaps be called ELLIPSE_OR_CIRCLE) At least such a type hierarchy would mean that we regain some kind of value substitutability, because we would now be able to substitute a value of type CIRCLE (or a value of type ELLIPSE, come to that) for a value of type ELLIPSE_OR_CIRCLE But then again, type ELLIPSE_OR_CIRCLE wouldn t have any values whose most specific type was ELLIPSE_OR_CIRCLE by definition, every such value would simply be either a value of type ELLIPSE or a value of type CIRCLE (and type ELLIPSE_OR_CIRCLE would be what Hugh Darwen and I call a union type).

Thus, it might be argued that this revised type hierarchy gives us back at least some of the advantages that our original design (in which CIRCLE was a subtype of ELLIPSE) gave us but it does so at the cost of having an extra type and a more complicated type hierarchy There might be other costs, too KU then goes on to assert that Every other aspect of the model whether concerning variables or values, operations or properties is perfectly preserved I don t know, here, whether KU is talking about the ellipses-and-circles example in particular or our model of type inheritance in general If it s the former, well, I think I ve discussed the issue sufficiently If it s the latter, well, I certainly don t think KU s alternative design in any way invalidates our original design.

Furthermore, KU doesn t address a crucial aspect of our approach, an aspect in which we clearly differentiate ourselves from just about every other approach I ve ever seen described in the literature I m referring to the aspect we call specialization by constraint (S by C) and generalization by constraint (G by C), according to which to talk extremely loosely! (a) squeezing an ellipse to make a equal to b converts that ellipse into a circle and (b) stretching a circle to make a greater than b converts that circle into a (noncircular) ellipse I find it extremely interesting that nobody has refuted, or even disputed, our claims that (a) S by C and G by C correspond to what actually happens in the real world and (b) we believe we know how to implement them (efficiently, too)..

The last message I want to discuss here came from DN, who wrote a pleasant (and unusually coherent!) commentary on the overall debate; indeed, I found myself in considerable sympathy with much of DN s main argument. To paraphrase somewhat, that argument was that C++ and other OO languages aren t really trying to deal with subtyping in their approach to inheritance;

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