What's the difference between :

interface BasePresenter<in T : BaseView> {
    fun attachView(view: T)
}

And

interface BasePresenter<T> {
    fun attachView(view: T)

when u specify

in:

for generic it means that you need to pass it as a parameter for any function but you cannot use that to return any value of the type specified to function where as when you just add

T

you can use the type as a parameter as well as return type to any function