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isSubclassOf

fun KClass<*>.isSubclassOf(base: KClass<*>): Boolean

Platform and version requirements: Kotlin 1.1, JVM

Returns true if this class is the same or is a (possibly indirect) subclass of base, false otherwise.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect.full/is-subclass-of.html