Class type required but T found

Question

I can\'t create an actor for some reason (here is a simple version of my class hierarchy):

abstract class Class1[T <: Class2[_]: ClassTag] extends Actor {         


        

Answer 1

One approach I have used involves creating an 'instantiator' trait which can be used to create instances of types for which an implicit instantiator exists:

trait Instantiator[+A] {
  def apply(): A
}

object Instantiator {
  def apply[A](create: => A): Instantiator[A] = new Instantiator[A] {
    def apply(): A = create
  }
}

class Foo() { ... }

object Foo {
  implicit val instantiator: Instantiator[Foo] = Instantiator { new Foo() }
}

// def someMethod[A]()(implicit instantiator: Instantiator[A]): A = {
def someMethod[A : Instantiator](): A = {
  val a = implicitly[Instantiator[A]].apply()
  ...
}

someMethod[Foo]()