Bound value in a conditional binding must be of Optional Type

Question

I have a protocol defined:

protocol Usable {
    func use()
}

and a class that conforms to that protocol

class Thing: Usabl         


        

Answer 1

This works for me in the playground

protocol Usable {
    func use()
}

class Thing: Usable {
    func use () {
        println ("you use the thing")
    }
}

let thing = Thing()
let testThing : AnyObject = thing as AnyObject

if let otherThing = testThing as? Thing {
    otherThing.use()
} else {
    println("can't use that")
}