diff -r 293b166c45c5 -r 05d202350b8d doc-src/IsarAdvanced/Codegen/Thy/examples/example.ML --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/doc-src/IsarAdvanced/Codegen/Thy/examples/example.ML Tue Sep 30 12:49:16 2008 +0200 @@ -0,0 +1,27 @@ +structure Example = +struct + +fun foldl f a [] = a + | foldl f a (x :: xs) = foldl f (f a x) xs; + +fun rev xs = foldl (fn xsa => fn x => x :: xsa) [] xs; + +fun list_case f1 f2 (a :: lista) = f2 a lista + | list_case f1 f2 [] = f1; + +datatype 'a queue = Queue of 'a list * 'a list; + +val empty : 'a queue = Queue ([], []); + +fun dequeue (Queue ([], [])) = (NONE, Queue ([], [])) + | dequeue (Queue (xs, y :: ys)) = (SOME y, Queue (xs, ys)) + | dequeue (Queue (v :: va, [])) = + let + val y :: ys = rev (v :: va); + in + (SOME y, Queue ([], ys)) + end; + +fun enqueue x (Queue (xs, ys)) = Queue (x :: xs, ys); + +end; (*struct Example*)