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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