Invoking a arbitrary function/method

Lets say that I have a need to hold an arbitrary function f within a Node

case class Node[A](f: Any -> Any)

(I couldn't find any type around Function or Callable. Scala core just defines FunctionNs)

This node will then randomly sample arguments from a Terminal Set which it is going to use to call f.

So it needs to know two things:

• the arity of f
• how to invoke f

---

Additional:

I can retrieve the arity of a method object using

def arity(f: AnyRef): Option[Int] = {
  val apply = f.getClass.getMethods.find(_.getName == "apply")
  apply.map(_.getParameterCount)
}


def add(x: Int, y: Int) = {
  x + y
}

arity(add _)

However calling arity(f _) (within a Node instance) no longer works.

Besides this, I still have the problem of how to invoke f

If you have suggestions for an alternative design approach please let me know.