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diff src/pair_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/pair_key_fn.sml	Mon Nov 09 13:38:04 2015 -0500
@@ -0,0 +1,12 @@
+functor PairKeyFn (structure I : ORD_KEY
+                     structure J : ORD_KEY)
+        : ORD_KEY where type ord_key = I.ord_key * J.ord_key = struct
+
+type ord_key = I.ord_key * J.ord_key
+
+fun compare ((i1, j1), (i2, j2)) =
+    case I.compare (i1, i2) of
+        EQUAL => J.compare (j1, j2)
+      | ord => ord
+
+end