Generic inheritance with where clause

[Nikita_Leonov]

Hello everyone,

I am looking a way to express something similar to the following code in
Swift terms:
protocol AnyViewModelInput {}
protocol AnyViewModel<ViewModelInput>: ViewModelInput where ViewModelInput:
AnyViewModelInput {
    var input: ViewModelInput { get }
}

Is it possible in current Swift? Will it be possible if generic
manifesto will be implemented in full? Also if you know how to express a
similar idea in any other language, I would love to see examples. How does
such construct is named in other languages?

Thank in advance,
Nikita

[somu]

Hi Nikita,

See if the below implementation fits your needs:

protocol P1 {}

protocol P2 : P1 where T : P1 {
    
    associatedtype T
    
    var input : T { get }
}

struct S1 : P1 {}

struct S2 : P2 {
    
    typealias T = S1
    
    var input: T
}

Regards,
Muthu

···

On 30 Aug 2017, at 1:25 AM, Nikita Leonov via swift-users <swift-users@swift.org> wrote:

Hello everyone,

I am looking a way to express something similar to the following code in Swift terms:
protocol AnyViewModelInput {}
protocol AnyViewModel<ViewModelInput>: ViewModelInput where ViewModelInput: AnyViewModelInput {
    var input: ViewModelInput { get }
}

Is it possible in current Swift? Will it be possible if generic manifesto will be implemented in full? Also if you know how to express a similar idea in any other language, I would love to see examples. How does such construct is named in other languages?

Thank in advance,
Nikita
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