In these cases, the Scala value class will be “boxed”, right?

Question

If I have this value class:

class ActionId(val value: Int) extends AnyVal

Then, in all the examples below, an object will be allocated for

Answer 1

With some implicit casts it is actually possible to get around the array-issue without the syntactic required by rex-kerr. I used it in conjunction with How to reduce the number of objects created in Scala?

Y.scala:

import scala.language.implicitConversions

class Y(val repr: String) extends AnyVal {}
object Y {
    implicit def stringToY (v:String) = new Y(v)
    implicit def yToString (v:Y) = v.repr
}

Main file:

import Y._

val y1 = new Y("apple")    // unboxed
val y2 = new Y("orange")   // unboxed
val ys: Array[String] = Array(y1, y2)   // Implicit cast
val y3:Y = ys(0)