fun foo(x : Invokable) { x() }
Above sample from http://blog.jetbrains.com/kotlin/2012/06/kotlin-m2-is-out/ doesn’t work. The IDE cannot find any reference to Invokable.
Invokable is a made-up class. I fixed the example. Thanks
Great, thanks.
For anyone who wants a quick sample, here’s some sample code
``
package Kotlin101.Objects.InvokableObjects
/* You can use any type that has a function named invoke() in a callee position:*/
trait Superhero {
public fun invoke()
}
class Batman : Superhero{
override fun invoke(){
println (“Batman punches”)
}
}
class Superman{
}
// this also works even if it’s just an extension function
fun Superman.invoke(){
println (“Superman flies”)
}
fun invoke (x : Batman){
x()
}
fun invoke2 (x : Superhero){
x()
}
fun invoke3 (x : Superman){
x()
}
fun main(args : Array<String>) {
var darkNight = Batman()
var clark = Superman()
invoke(darkNight)//direct type
invoke2(darkNight)//via trait
invoke3(clark)//via extension function
}