Typed Dictionary in Swift

TypedDictionary.swift

public struct Key<T> {
  let id: String
  private let type: T.Type = T.self
}

extension Key: Hashable {
  public var hashValue: Int {
    get {
      return self.id.hashValue ^ "\(self.type)".hashValue
    }
  }
}

public func ==<T>(key1: Key<T>, key2: Key<T>) -> Bool {
  return key1.id == key2.id && key1.type == key2.type
}

public struct TypedDictionary {
  private var dictionary: [Int: Any] = [:]
  
  public mutating func put<T>(key: Key<T>, value: T) {
    dictionary[key.hashValue] = value
  }
  
  public func get<T>(key: Key<T>) -> T? {
    return dictionary[key.hashValue] as? T
  }
}