Replacement for ?: operator in Clang

gistfile1.txt

// Replacement for Clang's (a ?: b) in Swift.
// Note: does not yet handle case when 'false' is supplied as Any? or AnyObject? type.

operator infix ||| { associativity left precedence 140 }

// Version for arbitrary optionals.
@infix func |||<A>(a:A?, b: @auto_closure ()->A?) -> A? {
    if let x = a {
        return a
    }
    return b()
}

// Version for booleans:
@infix func |||(a:LogicValue?, b: @auto_closure ()->LogicValue?) -> LogicValue? {
    if let x = a {
        if x.getLogicValue() {
            return a
        }
    }
    return b()
}


// Examples:

var a:Int? // if a has value, neither b() not c() will be called.

func b() -> Int? {
    println("side effect from b()");
    return 2
}

func c() -> Int? {
    println("side effect from c()");
    return 3
}

var x = a ||| b() ||| c()


var f1:Bool? = false // if f1 is true, f2() won't be called

func f2() -> Bool {
    println("side effect from f2()");
    return true
}


var y = f1 ||| f2()