Demonstrating Dynamic Swift using forwardingTarget

//: Playground - noun: a place where people can play
//To try out this code, copy and paste into a new Xcode playground.

import UIKit

class Operation: NSObject
{
  let nextOperation: Operation?
  init(next: Operation? = nil)
  {
    self.nextOperation = next
  }
  
  override func forwardingTarget(for aSelector: Selector!) -> Any?
  {
    print(String(describing: self))
    return nextOperation
  }
}

class FirstHandlerType: Operation
{
  func doSomething()
  {
    print("Did: ".appending(String(describing: self)))
  }
}

class SecondHandlerType: Operation
{
}

class ThirdHandlerType: Operation
{
}


let first = FirstHandlerType()
let second = SecondHandlerType(next: first)
let third: AnyObject = ThirdHandlerType(next: second) //add and remove AnyObject to see how Xcode handles the change.

third.doSomething()

Hi Casedemora,

The function doSomething() needs @obj dynamic keywords prefixed to be working correctly. Please correct me if wrong. Thank you