I've modified OOPer's code to work for any pair of hashables:
private var foo: [PairStruct<Int, Int>: String] = [:]
func bar() {
		foo[(1,2)] = "asdf"
}
protocol PairConvertible {
		associatedtype X
		associatedtype Y
		init(_ pair: (X, Y))
}
struct PairStruct<X, Y>: Hashable, PairConvertible where X: Hashable, Y: Hashable {
		let x: X
		let y: Y
		
		init(_ pair: (X, Y)) {
				self.x = pair.0
				self.y = pair.1
		}
}
extension Dictionary where Key: PairConvertible {
		subscript (key: (Key.X, Key.Y)) -> Value? {
				get {
						return self[Key(key)]
				}
				set {
						self[Key(key)] = newValue
				}
		}
		subscript (key0: Key.X, key1: Key.Y) -> Value? {
				get {
						return self[Key((key0, key1))]
				}
				set {
						self[Key((key0, key1))] = newValue
				}
		}
}
MEwer
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