Implicit conversion for Traversable instances where the elements are convertible. Scala implicit conversions are handy (if controversial). But when methods return pre-constructed collections of a type, the implicit conversion won't work - see http://stackoverflow.com/questions/8935811/scala-implicit-conversion-of-a-generic-argument?rq=1 This so…

ConvertTrav.scala

  /** Implicit conversion for Traversable instances where the elements are convertible - possibly controversial */
implicit def convTrav[S, T, I[S] <: Traversable[S]](input: I[S])(implicit c: S => T): I[T] =
    (input map c).asInstanceOf[I[T]]
    

/** Less controversial version of the above using the pimp-my-library pattern
- to use this, you must explicitly call .as[TypeName] on the source Traversable */
trait Convertible[M[A], A] {
  def as[B](implicit f: A => B): M[B]
}
  
implicit def travToConvertible[A, M[A] <: Traversable[A]](xs: M[A]) = new Convertible[M, A] {
  def as[B](implicit f: A => B) = (xs map f).asInstanceOf[M[B]]
}