Scala: reconciling type classes with dependency injection

Question

There seems to be a lot of enthusiasm among Scala bloggers lately for the type classes pattern, in which a simple class has functionality added to it by an addi

Answer 1

A fair amount of the tediousness of passing down those implicit dependencies can be alleviated by using the new context bound syntax. Your example becomes

def writeAll[T:Foo] (items: List[T]) =
  items.foreach(w => implicitly[Foo[T]].write(w))

which compiles identically but makes for nice and clear signatures and has fewer "noise" variables floating around.

Not a great answer, but the alternatives probably involve reflection, and I don't know of any library that will just make this automatically work.