From 91e5530ace053b1b9ea3a1fe64ce638ae6493314 Mon Sep 17 00:00:00 2001
From: Ziv Scully <ziv@mit.edu>
Date: Mon, 9 Nov 2015 13:38:04 -0500
Subject: Add new files missing from previous commit.

---
 src/pair_key_fn.sml | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 src/pair_key_fn.sml

(limited to 'src/pair_key_fn.sml')

diff --git a/src/pair_key_fn.sml b/src/pair_key_fn.sml
new file mode 100644
index 00000000..cd33950d
--- /dev/null
+++ b/src/pair_key_fn.sml
@@ -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
-- 
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