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| author |  Ziv Scully <ziv@mit.edu> | 2015-11-09 13:38:04 -0500 |
|---|---|---|
| committer | Ziv Scully <ziv@mit.edu> | 2015-11-09 13:38:04 -0500 |
| commit | 91e5530ace053b1b9ea3a1fe64ce638ae6493314 (patch) | |
| tree | 24b1ce27de7aef19039d006405bca9788c5ab38e /src/pair_key_fn.sml | |
| parent | aa2c8c64542d7930773da26573e186ec3753c268 (diff) | |
Add new files missing from previous commit.
Diffstat (limited to 'src/pair_key_fn.sml')
| -rw-r--r-- | src/pair_key_fn.sml | 12 |
1 files changed, 12 insertions, 0 deletions
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 |