Mercurial > urweb
diff src/pair_key_fn.sml @ 2277:6bce459ca581
Add new files missing from previous commit.
author | Ziv Scully <ziv@mit.edu> |
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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