Simple question: I need a set of classes that extend (in java) from a base class so that I can itera...

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[halirutan]

Simple question: I need a set of classes that extend (in java) from a base class so that I can iterate over the set and test an object if it is Base. Something along val clazzes : MutableSet< ???> = ... and then e.g. clazzes.forEach { c -> if(obj is c){..}}. How can I do that?

[bbaldino]

do you have instances? or the just the class types?

[bbaldino]

if it's instances, you could just have val instances = MutableSet<Any> and then instances.forEach { c -> if (c is Base) { .. } }

[bbaldino]

if it's types, maybe this would work? not sure how idiomatic/foolproof it is:

[bbaldino]

open class Base

class Sub : Base()

val clazzes = listOf(Int::class, Double::class, Sub::class)

clazzes.forEach { clazz -> if (clazz.supertypes.contains(Base::class.starProjectedType)) println("found subtype") }

[halirutan]

@bbaldino I have something like this (which is wrong)

[halirutan]

kotlin
private val myClasses : MutableSet<Class<in FoldingDescriptor>> = mutableSetOf()

  constructor(expand: Boolean, vararg classes: Class<in FoldingDescriptor>){
    myExpand = expand
    myClasses.addAll(classes)
  }

[halirutan]

So I want to add classes and not instances to the set.

[halirutan]

And I want to say that it is a set of classes that extend FoldingDescriptor.

[bbaldino]

and supertypes won't help?

[halirutan]

Hmm, I think the problem is the is operator. Let me read some more.

[Dico]

clazz.isInstance