dispatch.swift

struct Test {
    func aMethod() {}
}
class Test1 {
    func aMethod() {}
}
class Test2 {
    func aMethod() {}
}
class Test2Subclass: Test2 {
    override func aMethod() {}
}
extension Test2Subclass {
    func aExtensionMethod() {}
}
final class Test2FinalSubclass: Test2 {
    override func aMethod() {}
}
let test = Test()
test.aMethod()

let test1 = Test1()
test1.aMethod()

let test2Subclass = Test2Subclass()
test2Subclass.aMethod()
test2Subclass.aExtensionMethod()

let test2Final = Test2FinalSubclass()
test2Final.aMethod()