6 lines
219 B
OCaml
6 lines
219 B
OCaml
|
datatype 'a tree = Empty | Node of 'a * 'a tree * 'a tree
|
||
|
|
|
||
|
|
(** val map_tree = fn : ('a -> 'b) -> 'a tree -> 'b tree *)
|
||
|
|
fun map_tree f Empty = Empty
|
||
|
|
| map_tree f (Node (x,l,r)) = Node (f x, map_tree f l, map_tree f r)
|