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I want a map between Int and any class. In Java it would be Map<Class<?>, Integer>. What's the Kotlin equivalent of that?
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Kotlin supports overloading for callables and properties, that is, the ability for several callables (functions or function-like properties) or properties with the same name to coexist in the same scope, with the compiler picking the most suitable one when such entity is referenced.
By using ::class , you get an instance of KClass. It is Kotlin Reflection API, that can handle Kotlin features like properties, data classes, etc. By using ::class. java , you get an instance of Class.
The KClass type is Kotlin's counterpart to Java's java. lang. Class type. It's used to hold references to Kotlin classes; you'll see what it lets you do with those classes in the “Reflection” section later in this chapter. The type parameter of KClass specifies which Kotlin classes can be referred to by this reference.
The equivalent declaration would be Map<Class<*>, Int>.
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