CODEWITHSUNDEEP
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Cyupa
Cyupa

Reputation: 1135

Swift 4 protocol extension - convenience initializer default implementation

I'm trying to figure out how to create a default protocol initializer implementation in a protocol extension that implementing types can inherit.

It looks something like this:

protocol Initializable {
    associatedtype EntityType: ConcreteClass
    var container: Container<EntityType> { get set }
    init()
}

class Container<T: ConcreteClass> {
    typealias EntityType = T
    let configuration : Configuration

    init(config: Configuration) {
        configuration = config
    }

    func getAll() -> [EntityType] {
        return [EntityType()]
    }
}

extension Initializable {
    init(config: Configuration) {
        self.init()
        self.container = Container<EntityType>(config: config)
    }
}

final class Repo: Initializable {
    typealias EntityType = String
    var container: Container<String>
}

I end up with the following compiler error:

Type 'Repo' does not conform to protocol 'Initializable'. Candidate has non-matching type 'init(type: EntityType.Type)'

Upvotes: 2

Views: 988

Answers (1)

maxkoriakin
maxkoriakin

Reputation: 337

You use different init in protocol and extension. 

init(type: EntityType)

You must implement realization of method init() in extension or in class

Upvotes: 1

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