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Ingy döt Net 2013-04-10 23:57:08 -07:00
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commit b83f433714
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Task/Parametric-polymorphism/Standard-ML/parametric-polymorphism.ml Normal file
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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)