Tuple as key in a dictionary hack.swift

extension Dictionary where Key == Int64, Value == SKNode {
    func int64key(_ key: (Int32, Int32)) -> Int64 {
        return (Int64(key.0) << 32) | Int64(key.1)
    }
    
    subscript(_ key: (Int32, Int32)) -> SKNode? {
        get {
            return self[int64key(key)]
        }
        set(newValue) {
            self[int64key(key)] = newValue
        }
    }
}

// Usage example
var dictionary: [Int64 : SKNode] = [:]
dictionary[(0,1)] = SKNode()
dictionary[(1,0)] = SKNode()
print(dictionary)