Kotlin, generic operation on Number

Question

I have the following

abstract interface Vec2t {    
    var x: T
    var y: T
}

data class Vec2(override var x: Fl

Answer 1

Unfortunately there's no clean way to have generic abs function. You can work it around with the following abs definition:

object glm {
    fun <T : Number> abs(x: T): T {
        val absoluteValue: Number = when (x) {
            is Double -> Math.abs(x)
            is Int -> Math.abs(x)
            is Float -> Math.abs(x)
            is BigDecimal -> x.abs()
            is BigInteger -> x.abs()
            else -> throw IllegalArgumentException("unsupported type ${x.javaClass}")
        }
        @Suppress("UNCHECKED_CAST")
        return absoluteValue as T
    }
}

Which would make it possible to use in your context:

fun abs(res: Vec2, a: Vec2): Vec2 {
    res.x = glm.abs(a.x)
    ...
}