//Document2.scala
object Title // This object is used an an argument for a fluent interface

class Document {
  private var title = ""
  private var useNextArgAs: Any = null
  def set(obj: Title.type): this.type = { useNextArgAs = obj; this }
  def to(arg: String) = if (useNextArgAs == Title) title = arg;
  override def toString = getClass.getName + "[title=" + title + "]"
}

object Main extends App {
  val book = new Document
  book set Title to "Scala for the Impatient"
  println(book)
}