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Classes can now have static methods and properties

Available from Swift 1.2

Paul Hudson      @twostraws

Swift 1.2 gives us an alias for class final properties: static. While class variables may be overridden in subclasses, static variables may not. For example:

class Student: Person {
    // THIS ISN'T ALLOWED
    override static var count: Int {
        return 150
    }

    // THIS IS ALLOWED
    override class var averageAge: Double {
        return 19.5
    }
}

In this usage, static var is merely an alias for final class var.

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