Compare 2 optionnel arrays in Swift, thanks to Sysy !

Optionnel<Array<T>>.swift

// At present, Optional<Array<T>> is not possible to make equatable even though T might be.
// This fakes that that behaviour to make comparisons between optional arrays simpler.

func !=<C: Equatable>(lhs: [C]?, rhs: [C]?) -> Bool {
    return !(lhs == rhs)
}

func ==<C: Equatable>(lhs: [C]?, rhs: [C]?) -> Bool {
    switch (lhs, rhs) {
    case (.Some(let lhs), .Some(let rhs)):
        return lhs == rhs
    case (.None, .None):
        return true
    default:
        return false
    }
}

let arr: [Int]? = nil
let arr2: [Int] = [1]
let equal = arr == arr2