abstract class Any

Class Any is the root of the Scala class hierarchy. Every class in a Scala execution environment inherits directly or indirectly from this class.

Starting with Scala 2.10 it is possible to directly extend Any using _ universal traits_ . A universal trait is a trait that extends Any , only has def s as members, and does no initialization.

The main use case for universal traits is to allow basic inheritance of methods for value classes. For example,

trait Printable extends Any {
  def print(): Unit = println(this)
class Wrapper(val underlying: Int) extends AnyVal with Printable

val w = new Wrapper(3)

See the Value Classes and Universal Traits for more details on the interplay of universal traits and value classes.

Full Source: