Talk:Polymorphism: Difference between revisions
→Circle is a Point?
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==Circle is a Point?==
Hi, I think there's a big conceptual error in the code examples: Almost all of them derive a Circle class from a Point class. This is IMHO conceptually wrong; derivation would mean that a circle ''is-a'' point, which is clearly not the case. You wouldn't normally pass circles to functions expecting points (say, a function returning the straight line through two points).
:''It's probably worth noting that the center of a circle is a point. (This issue was treated in some of the sample code in this section, but was not even touched on in the surrounding discussion. That said, a relevant underlying issue might be that polymorphism has little to do with abstraction.) --[[User:Rdm|Rdm]] 13:59, 26 October 2011 (UTC)''
The task, as described, doesn't demand to make that error (although I suspect that whoever wrote that task had this wrong derivation in mind).
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