Swift type checking

main.swift

import UIKit

protocol Animal {}
class Cat : Animal {}
class Dog : Animal {}
class GreatDane : Dog {}

let c = Cat()
let d = Dog()
let gd = GreatDane()

func hereIsTheQuestion(object: Animal, tType: Animal.Type) -> Bool {
    // question: does object inherit from tType?
}

hereIsTheQuestion(object: c, tType: Dog.self) // should return false
hereIsTheQuestion(object: gd, tType: Dog.self) // should return true

w/o NSObject

protocol Animal {}

class Dog: Animal {}
class Cat: Animal {}
class GermanShepard: Dog {}

var aDog: Animal = Dog()
var gs: Dog = GermanShepard()
var c: Cat = Cat()

print(aDog is Cat) // prints true
print(type(of: aDog)) // prints Dog

func check<T: Animal>(object: Animal, inType: T.Type) -> Bool {
    return object is T
}

check(object: c, inType: Dog.self) // prints false