CoVariantExample.kt

open class FLower(){
}

class Rose: FLower(){}

//A garden has flowers.
open class Garden<out T: FLower>(){

    val flowers: List<T> = listOf()
    fun pickFlower(i: Int ):T = flowers[i]

 fun plantFLower(flower: T) {}



}

fun waterGarden( garden: Garden<FLower>) {}

// when we talk about in and out position of covariance , we talk about memmber functions and not top level functions.
fun tendGarden(roseGarden: Garden<Rose>) {
    waterGarden(roseGarden)
}