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diff src/list_key_fn.sml @ 2277:6bce459ca581

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Add new files missing from previous commit.
author Ziv Scully <ziv@mit.edu>
date Mon, 09 Nov 2015 13:38:04 -0500
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/list_key_fn.sml	Mon Nov 09 13:38:04 2015 -0500
@@ -0,0 +1,14 @@
+functor ListKeyFn(K : ORD_KEY)
+        : ORD_KEY where type ord_key = K.ord_key list = struct
+
+type ord_key = K.ord_key list
+
+val rec compare =
+ fn ([], []) => EQUAL
+  | ([], _) => LESS
+  | (_, []) => GREATER
+  | (x::xs, y::ys) => case K.compare (x, y) of
+                              EQUAL => compare (xs, ys)
+                            | ord => ord
+
+end