AnyRefOption.scala

final class AnyRefOption[T >: Null <: AnyRef] private(private val value: T) extends AnyVal {
  def isEmpty = value == null
  def isDefined: Boolean = !isEmpty
  def get: T = value

  def foreach[U](fn: T => U): Unit = {
    if (isDefined) fn(value)
  }

  def let[U](fn: T => U) = if (isDefined) fn(value) else AnyRefOption(null)
  def also[U](fn: T => U): T = if (isDefined) {
    fn(value)
    value
  } else value
}

object AnyRefOption {
  def apply[T >: Null <: AnyRef](value: T): AnyRefOption[T] = new AnyRefOption[T](value)

  object NonNull {
    def unapply[T >: Null <: AnyRef](opt: AnyRefOption[T]) = opt
  }

  object Null {
    def unapply[T >: Null <: AnyRef](opt: AnyRefOption[T]) = opt.isEmpty
  }

  implicit class ext[T >: Null <: AnyRef](val self: T) extends AnyVal {
    def toOption: AnyRefOption[T] = AnyRefOption(self)
    def ? = toOption
  }
}