Hi Jon, You are right that this is a limitation of the current implementation in Swift 2.2. I may have fixed this recently in master:
https://github.com/apple/swift/commit/3aacf5d805768527b59d24e6da2a03911b3dd5b0 <https://github.com/apple/swift/commit/3aacf5d805768527b59d24e6da2a03911b3dd5b0> It would be great if you could try the latest compiler with your code. Slava > On Mar 9, 2016, at 12:48 PM, Jon Shier via swift-users > <swift-users@swift.org> wrote: > > Swifters: > I just encountered the error “Superclass constraint > ‘RepeatableNetworkOperation<U>’ cannot depend on a type parameter” on this > definition: > > class RepeatedNetworkOperation<T, U where U: Decodable, U == U.DecodedType, > U: Repeatable, T: RepeatableNetworkOperation<U>>: RepeatedOperation<T> { … } > > where the relevant other classes are defined as: > > class InterruptibleNetworkOperation<T: Decodable where T == T.DecodedType>: > GroupOperation { … } > class RepeatedOperation<T where T: NSOperation>: GroupOperation { … } > class RepeatableNetworkOperation<T where T: Decodable, T == T.DecodedType, T: > Repeatable>: InterruptibleNetworkOperation<T>, Repeatable { … } > > I understand the error, but am I correct in thinking this is just a > limitation of Swift’s current type and/or generics systems? I’m not a > language theorist, but it seems perfectly reasonable that something like this > should work. If it is just a limitation and not something I’m doing wrong, > are there any suggestions for a workaround? The class I’m trying to write > would really clean up my code. > > > Jon > > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users
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