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Read this paper (Score:1)
One of the papers that the Traits guys wrote called Applying Traits to the Smalltalk Collection Hierarchy [unibe.ch] is very relevant to this. It shows what is, in my opinion, a perfect example of where roles are best used and how they are superior to inheritance. The key thing to note is that they still retained a lot of inheritance where there was a true is-a relation, but they removed a lot of unnecessary inheritance that was really only there to achieve code reuse.
- Stevan
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