how to make a function with one input parameter which returns the same type but retains nullability ...

# getting-started

[poohbar]

how to make a function with one input parameter which returns the same type but retains nullability in a generic way?

e.g. T -> T and T? -> T?

[edrd]

The default upper bound of generics is T? so if your function is fun <T> foo(bar: T): T and you call it as foo<Int?>(3) the return type will be of type Int?.

[poohbar]

what if the function shuold onlly accept Int and Int??

[edrd]

Declare it as fun <T : Int?> ...

[poohbar]

thanks!