Kotlin interface to lambda Any Trick kotlinlang #announcements

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Title

m

Mahendran

09/06/2019, 10:25 AM

Kotlin interface to lambda? (Any Trick)

c

Can Orhan

09/06/2019, 10:33 AM

Do you mean something like?:

interface MyInterface {
    fun myFunction()
}

fun usesMyInterface(myInterface: MyInterface) { }

usesMyInterface(object : MyInterface {
    override fun myFunction() {
        
    }
})

s

Stephan Schroeder

09/06/2019, 10:52 AM

@Can Orhan not a lambda though

interestingly this compiles

fun main() {
    usesMyInterface({name: String -> println("hello $name")} as MyInterface)
}

interface MyInterface {
    fun myFunction(s: String)
}

fun usesMyInterface(myInterface: MyInterface) {
    myInterface.myFunction("Yoda")
}

but throws an error. https://pl.kotl.in/_stgLor9V

c

Can Orhan

09/06/2019, 10:59 AM

Yeah sorry 😄 I had difficulty understanding exactly what the question wanted in the first place. I should have just said nothing 😄

s

SiebelsTim

09/06/2019, 11:00 AM

You want SAM conversions for kotlin interfaces. There is an open ticket for it.

c

Casey Brooks

09/06/2019, 2:12 PM

Rather than defining it as an interface, maybe try writing it as a typealias.

typealias MyInterface = (s: String)->Unit

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