I think you're after "associated types". developer.apple.com/library/ios/do Gist: gist.github.com/kongtomorrow/7
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That requires making a 1-to-1 relationship between each `Smashable`-adopter and each `Value`-adopter
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Right. Value can't be directly Equatable and used as a dynamic type currently.
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You could put an "isEqual(Value)" method on Value to model heterogeneous equality.
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Implementing that so as to allow later additions to the set of Value-conformers would be challenging.