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A swift protocol with associated type used as type parameter in generic function
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| protocol Thing { | |
| typealias argType | |
| func doit(val:argType) -> argType | |
| } | |
| class IntThing : Thing { | |
| func doit(val: Int) -> Int { | |
| return val + 1 | |
| } | |
| } | |
| func doThing<A:Thing>(thing:A, val:A.argType) -> A.argType { | |
| return thing.doit(val) | |
| } | |
| doThing(IntThing(), 2) |
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How would you declare a delegate property of type
Thing?weak var delegate: Thing?would produce Xcode error:Protocol 'Thing' can only be used as a generic constraint because it has Self or associated type requirements