Question

I have a Java class that takes a generic type parameter and a class object related to that type:

public class Foo<T> {
    public Foo(Class<? extends T> type) {
    ...
    }
}

At first I thought I could make a clever wrapper for this in Scala:

class Bar[T](implicit m: Manifest[T]) {
    ...
    new Foo[T](m.erasure)
    ...
}

But this results in a compiler error similiar to this:

error: type mismatch;
found   : java.lang.Class[_$1(in value <local Bar>)] where type _$1(in value <local Bar>)
required: java.lang.Class[_ <: T] 
class Bar[T](implicit m: Manifest[T]) { new Foo[T](m.erasure) }

I think I understand why this happens, but is there any way I could get the correct type of class and make this code compile?

Answer 1

How about m.erasure.asInstanceOf[Class[T]]?

By the way, see this question for an explanation of why erasure returns Class[_] and not Class[T].