Ruby-style trailing conditionals in Scala

Conditional.scala

class Conditional[T](left: => T) {
  def iff(right: => Boolean): Option[T] = if (right) Some(left) else None
  def unless(right: => Boolean): Option[T] = if (!right) Some(left) else None
}

implicit def any2Unless[T](left: => T) = new Conditional(left)

Usage.scala

scala> val k = 1001
k: Int = 1001

scala> k iff k % 2 == 0
res9: Option[Int] = None

scala> k unless k % 2 == 0
res10: Option[Int] = Some(1001)