Yes. You need to put it in an extension.
extension Foo where T1 == T2 {
convenience init(values: [T1]){
….
}
}
> On 15 May 2016, at 14:45, Neil Faiman via swift-users <swift-users@swift.org>
> wrote:
>
> Is it possible for a generic class to have methods (specifically,
> initializers) which are only defined if the generic parameters meet certain
> constratins?
>
> Here’s a concrete example:
>
> class Foo <T1, T2> {
> init(pairs: [(T1, T2)]) {}
> // What I’d like to be able to doL
> convenience init "where T1 == T2" (values: [T1]) { self.init(pairs:
> values.map{ ($0, $0) }) }
> }
>
> That is, I’d like to provide a convenience initializer that takes an array of
> values instead of pairs, and turns the values into pairs, IF THE TWO GENERIC
> TYPE PARAMETERS ARE THE SAME.
>
> I can’t find a way to accomplish this. Is there one?
>
> Thanks,
>
> Neil Faiman
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