Slava:
I won’t be able to test my actual code, as the Operations and Alamofire
libraries haven’t been updated for Swift 3 (which I wouldn’t expect), but I’ll
try to put together a test cast that is similar and see if it works? When will
this change be part of the package I can download for Xcode 7.3?
Jon
> On Mar 17, 2016, at 1:01 PM, Slava Pestov <spes...@apple.com> wrote:
>
> 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 <mailto: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
>>
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>> swift-users@swift.org <mailto:swift-users@swift.org>
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>
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