How to create Dictionary that can hold anything in Key? or all the possible type it capable to hold

Question

I want to create a Dictionary that does not limit the key type (like NSDictionary)

So I tried

var dict = Dictionary

        

Answer 1

I took the liberty of cross-posting / linking to this question on a separate post on the Apple Dev forums and this question is answered here.

Edit

This answer from the above link works in 6.1 and greater:

struct AnyKey: Hashable {
    private let underlying: Any
    private let hashValueFunc: () -> Int
    private let equalityFunc: (Any) -> Bool

    init(_ key: T) {
        underlying = key
        // Capture the key's hashability and equatability using closures.
        // The Key shares the hash of the underlying value.
        hashValueFunc = { key.hashValue }

        // The Key is equal to a Key of the same underlying type,
        // whose underlying value is "==" to ours.
        equalityFunc = {
            if let other = $0 as? T {
                return key == other
            }
            return false
        }
    }

    var hashValue: Int { return hashValueFunc() }
}

func ==(x: AnyKey, y: AnyKey) -> Bool {
    return x.equalityFunc(y.underlying)
}