KotlinGenerics
My description of various things to do with Kotlin generics and examples, feel free to add your usage examples.
Most of examples are made with use of reified classes but may also be done with use of standard KClass instances, for example instead of T::class (where T were provided as Something while calling function) you can use Something::class
Calling companion object function
Firstly we need to take KClass instance of companion object which happens by T::class.companionObject, it may be null if class doesn't have companion object.
Later companionClass can be handled as typical KClass, so when we find function (KFunction) that we need we can simply call it func.call() but be aware, calling companion object's function requires passing companion object's instance as argument, even when the function doesn't have any arguments declared. You can access companion object's instace from Something's KClass (not companion object's KClass).
In case companion object's function has arguments, they are passed after companion object's instance.
Example class:
class Something {
companion object {
fun staticTest(): String {
return "Works"
}
}
}Example usage calling:
inline fun <reified T> callStatic(): String {
val companionClass = T::class.companionObject!!
val func = companionClass.functions.find {
it.name == "staticTest"
}!!
return func.call(T::class.companionObjectInstance) as String
}