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-rw-r--r--lib/util.mli4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/util.mli b/lib/util.mli
index 1eb60f509a..fa3b622621 100644
--- a/lib/util.mli
+++ b/lib/util.mli
@@ -17,6 +17,10 @@ val on_fst : ('a -> 'b) -> 'a * 'c -> 'b * 'c
val on_snd : ('a -> 'b) -> 'c * 'a -> 'c * 'b
val map_pair : ('a -> 'b) -> 'a * 'a -> 'b * 'b
+(** Comparing pairs *)
+
+val pair_compare : ('a -> 'a -> int) -> ('b -> 'b -> int) -> ('a * 'b -> 'a * 'b -> int)
+
(** Mapping under triple *)
val on_pi1 : ('a -> 'b) -> 'a * 'c * 'd -> 'b * 'c * 'd