Cf_index_node.BinaryTree structures use Binary(K) to make an index node where K.t is the index value associated to its codomain value by the node.
module K : Cf_relations.Ordertype index = K.tThe type of an index value.
type +'a t = K.t * 'aThe type of an index node.
val obj : 'a t -> 'aTree structure use obj n to get the codomain value of n.
Tree structures use icompare i n to compare i with the index value of n.