Overloading Operators in Swift

Question

I'm trying to implement the Comparable protocol in Swift, but the compiler doesn't like any of my attempts to overload the < operator. I've checked the Apple documents and all the SO posts, but none of them even compile. Xcode gives me this warning:

Consecutive declarations on a line must be separated by ';'

and it keeps recommending me to insert a semicolon after the less than symbol. Any insight on what I'm doing wrong is appreciated.

class SomeClass: NSObject, Equatable, Comparable{

    var number: UInt32!

    override init()
    {
        super.init()
        self.number = arc4random()
    }

    func == (lhs: SomeClass, rhs: SomeClass) -> Bool
    {
        return true
    }

    func < (lhs: SomeClass, rhs: SomeClass) -> Bool
    {
        return true
    }

}

Sebastian · Accepted Answer · 2015-01-23 15:43:46Z

13

You see this error, because operators have to be overloaded outside the class definition, e.g. move

func == (lhs: SomeClass, rhs: SomeClass) -> Bool
{
    return true
}

func < (lhs: SomeClass, rhs: SomeClass) -> Bool
{
    return true
}

outside your class definition and it will work (except for that they do not return the proper result with this implementation).

edited Jan 23, 2015 at 15:43

answered Jan 23, 2015 at 15:38

Sebastian

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