In Swift can I use a tuple as the key in a dictionary?

Question

I\'m wondering if I can somehow use an x, y pair as the key to my dictionary

let activeSquares = Dictionary <(x: Int, y: Int), SKShapeNode>()
         


        

Answer 1

As mentioned in the answer above, it is not possible. But you can wrap tuple into generic structure with Hashable protocol as a workaround:

struct Two : Hashable {
  let values : (T, U)

  var hashValue : Int {
      get {
          let (a,b) = values
          return a.hashValue &* 31 &+ b.hashValue
      }
  }
}

// comparison function for conforming to Equatable protocol
func ==(lhs: Two, rhs: Two) -> Bool {
  return lhs.values == rhs.values
}

// usage:
let pair = Two(values:("C","D"))
var pairMap = Dictionary,String>()
pairMap[pair] = "A"