[swift-users] Workaround for generics not currently supporting conditional conformance to a protocol

[Howard Lovatt]

Hi All,

Does anyone have a good workaround for generics not currently supporting
conditional conformance to a protocol. As stated in the Generics Manifesto
something like this would be nice:

  extension Array: Equatable where Element: Equatable {
        static func ==(lhs: Array, rhs: Array) -> Bool { ... }
    }

But I would currently write a wrapper, something like:

    struct ArrayE<T: Equatable> {
        var elements: [T]
    }
    extension ArrayE: Equatable {
        static func ==(lhs: ArrayE, rhs: ArrayE) -> Bool { ...  }
    }

This can get unwieldy when there are a lot of conditional protocol
extensions required, i.e. wrappers round wrappers.

Is there a better way?

Thanks for any tips,

  -- Howard.
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