Swift default value for generic enum

Asked Feb 17 '21 at 09:07

Active Feb 17 '21 at 10:10

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I've an Enum with generic type like this:

public enum ServiceError<FailureResponse: Decodable>: Swift.Error {
    case other(Error)
    case underlying(statusCode: Int, response: URLResponse)
    case decodeError(error: FailureResponse?)
}

Can i set a default type to FailureResponse? if I could do that, whoever uses my library would not be forced to pass the generic type

edited Feb 17 '21 at 09:12

Claudio

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asked Feb 17 '21 at 09:07

nunzio giulio caggegi

1

I think the only way is using a `typealias`, but you would not be able to use the `ServiceError` enum name. – Claudio Feb 17 '21 at 09:13
mmm...can i show me it? – nunzio giulio caggegi Feb 17 '21 at 09:36
For example: `typealias DefaultServiceError = ServiceError` where `MyCustomDecodable` is your default FailureResponse decodable – Claudio Feb 17 '21 at 09:43
2

What default type do you want `FailureResponse` to be? Note that `Decodable` is not an option (see [here](https://stackoverflow.com/questions/33112559/protocol-doesnt-conform-to-itself)). – Sweeper Feb 17 '21 at 09:52
Does this answer your question? https://stackoverflow.com/a/42015159/9188735 – Tomas Jablonskis Feb 17 '21 at 10:35
mmm...typealias isn't the answer. My is an external library. The typealias remains at external. Correct? – nunzio giulio caggegi Feb 18 '21 at 08:27
@nunziogiuliocaggegi typealias is probably not the best solution. About being external, I believe you're talking about the visibility, right? The visibility works like any other structure – Claudio Feb 18 '21 at 12:29

Swift default value for generic enum

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