Question: In Example 6.70 we described a programming idiom in which an iterator takes a loop body function as argument, and applies it to every element

In Example 6.70 we described a programming idiom in which an iterator takes a “loop body” function as argument, and applies it to every element of a given ontainer or set. Show how to use this idiom in ML to apply a function to every element of the tree in Example 11.39. Write versions of your iterator for preorder, inorder, and postorder traversals.

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ANSWER Preorder Iterator fun preorderTreeIter f a b c d unit t a b c d Tree let fun preorderHelper t ... View full answer

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