How to infer generic type from function parameter in Kotlin?

Question

I have a base enum like this

enum MyEnum<T> {
    val initialValue: T
    val minValue: T
    val maxValue: T 
}

And I have a couple of methods like:

protected fun setEngineValue(myEnum: MyEnum<Float>, value: Float): Boolean {}

protected fun setEngineValue(myEnum: MyEnum<Int>, value: Int): Boolean {}

I want to merge it into one function where the type of value is inferred from myEnum. I have done this in other languages like Typescript but I can not find a way to do it in Kotlin.

Something like:

protected fun setEngineValue(myEnum: MyEnum<*>, value: typeOf *): Boolean {

}

Animesh Sahu · Accepted Answer · 2020-12-09 14:28:33Z

2

This can be done by binding them to a generic:

protected fun <T> setEngineValue(myEnum: MyEnum<T>, value: T): Boolean {}

Though note that, use of generic type in place of primitives will box them.

answered Dec 9, 2020 at 14:28

Animesh Sahu

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