If I have a function with parameter param: () -> Boolean how can I call this function using method reference Foo:myFunction as a parameter?

What's

Foo

here? A class?

Good question, interface actually

Then your

param

either needs an instance parameter or you need to do

someFooInstance::myFunction

The actual use case is that I need to call this function in two places, other just () -> true and other using Foo:myFunction

Well

Foo::myFunction

is of type

Foo.() -> Boolean

, it needs the actual instance of

Foo

to call the method on.

ah, correct, forgot about that.