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# coroutines

[Slackbot]

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[octylFractal]

shouldn't this be in #general ? not sure what's coroutine-related about this

[Kristoffer Andersen]

You can put bounds on the parameters on the extension function:

class A<T>(val contents: T)

fun <T : Number> A<T>.foo(): Int = contents.toInt() + 4

val x = A(4).foo()
val y = A("Test").foo()

[Kroppeb]

Oof, I though I posted this in general, Is there a way to move a msg?

[Kroppeb]

https://kotlinlang.slack.com/archives/C0922A726/p1580899157179400

[Kroppeb]

@Kristoffer Andersen That does only allow you to specify a type parameter for the receiver function, not for the context.