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 believe that, as of Swift 1.2, you can use an ObjectIdentifier struct for this. It implements Hashable (and hence Equatable) as well as Comparable. You can use it to wrap any class instance. I'm guessing the implementation uses the wrapped object's underlying address for the hashValue, as well as within the == operator.