Feature Request: Number Reference

Language Design
1

Hello,

Is it possible to return a reference to a number (Int, Long…) in Kotlin? For example, I have a variable a: Int = 5 and a function identity(a: Int) = return a, I want to do something like identity(a) += 5 which will add 5 to a.

If it is not possible, I think it would be very nice if Kotlin can support it one day.

Thank you for creating Kotlin

2

JVM has atomic numbers like AtomicInteger. Which are mutable and used by reference. You can overload ariphmetics for them.