case classChain[U](in: (T) ⇒ U, out: (T) ⇒ U) extends (T) ⇒ U with Product with Serializable
A pair of attributes that thread through a tree in a depth-first
left-to-right fashion. The in (out) attributes provides the value
of the chain as it enters a node from above (leaves a node to the
above).
A pair of attributes that thread through a tree in a depth-first left-to-right fashion. The
in
(out
) attributes provides the value of the chain as it enters a node from above (leaves a node to the above).