ExtensionProtocol.swift

//New Feature on Swift2

//: # Swift2 Features - Extension Protocol

import Darwin


protocol PrintDescription {
    func printDescription() -> String
}

class Person : PrintDescription{
    var name = "Joan"
    var age = 21
    
    func printDescription() -> String {
        return "\(name) - \(age)"
    }
}

class Thing : PrintDescription {
    var name = "Ball"
    var size = 10
    
    func printDescription() -> String {
        return "\(name) - \(size)"
    }
}

extension PrintDescription {
    var awesomenessIndex: String {
        get {
            return printDescription() + " other description"
        }
    }
}

var t = Thing()
t.awesomenessIndex
t.printDescription()