Is it even possible to create a method reference t...

# announcements

[Iaroslav Postovalov]

Is it even possible to create a method reference to such a function?

public operator fun T.minus(b: T): T = add(this, -b)

[diesieben07]

Yes, but you have to decide on what T should be beforehand:

public operator fun <T> T.minus(b: T): T = add(this, -b)

val ref = String?::minus
val ref2 = Any?::minus
val ref3 = SomeClass::minus

These all work and all point to the same function, with T being String?, Any? and SomeClass respectively.

[Rob Elliot]

I assume T in the original was a concrete type, not a generic one - otherwise unaryMinus wouldn’t resolve.