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Parametric polymorphism: Difference between revisions
added standard ml
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(added standard ml) |
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Line 132:
| Empty -> Empty
| Node (x,l,r) -> Node (f x, map_tree f l, map_tree f r)
=={{header|Standard ML}}==
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)
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