Is it possible to create a function overload with ...

# announcements

[LeoColman]

Is it possible to create a function overload with the suspend modifier without changing packages? I would like to create something like

fun foo(fn: () -> Unit) {}
suspend fun foo(fn: suspend () -> Unit) {}

but in the same package

[serebit]

No, because as far as the JVM is concerned, those two functions have the same signature. It’s like return types, the callsite can’t easily distinguish between the two

[LeoColman]

And if I change the JVM name it still doesn't work

[LeoColman]

Oh, I see... The caller can't distinguish

[LeoColman]

Dang.

[LeoColman]

And I suppose there isn't a way to say "This function may be suspend if called from a suspend context, and not suspend if not"

[serebit]

Not that I’m aware of. You could call one foo and the other fooBlocking

[LeoColman]

I see. Thanks for the insight

[cbruegg]

The JVM actually sees two different signatures. The suspend function actually has an implicit Continuation parameter. But the caller can't distinguish, exactly.

[LeoColman]

What I tried to do was inline the function, so that it would use the suspension context it is in

[LeoColman]

But I use reflect inside foo with fn, so that doesn't work.

[LeoColman]

Can anything be done about it?