Switch statement for imported NS_OPTIONS (RawOptionSetType) in Swift?

Question

The switch statement in Swift is so much more expressive. I\'m wondering if this might be possible:

Lets look at UIViewAutoresizing for example. It\'s defined in Objecti

Answer 1

You definitely can, although it's a little more convoluted now that RawOptionSetType doesn't implement the BooleanType protocol.

switch foo {
case let x where x & .FlexibleHeight != nil:
    println("height")
case let x where x & .FlexibleWidth != nil:
    println("width")
case let x where x & .FlexibleTopMargin != nil:
    println("top margin")
default:
    println("no")
}

Note that this stops on the first condition that matches! So it really is another form of this:

if foo & .FlexibleHeight != nil {
    println("height")
} else if foo & .FlexibleWidth != nil {
    println("width")
} else if foo & .FlexibleTopMargin != nil {
    println("top margin")
}