X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fextlib%2FhExtlib.ml;h=c0364315a62c018923f2c9e76873a35087c15fd2;hb=4b16cd90528e372205d9537b974e3d948ef85802;hp=32f33bd2be735bbb3d5df18d4d63cc0c62e863e9;hpb=4b18357deddbebc2fef6187b8810e7a343b9813b;p=helm.git

diff --git a/helm/software/components/extlib/hExtlib.ml b/helm/software/components/extlib/hExtlib.ml
index 32f33bd2b..c0364315a 100644
--- a/helm/software/components/extlib/hExtlib.ml
+++ b/helm/software/components/extlib/hExtlib.ml
@@ -172,6 +172,19 @@ let rec list_findopt f l =
   in
   aux l
 
+let split_nth n l =
+  let rec aux acc n l =
+    match n, l with
+    | 0, _ -> List.rev acc, l
+    | n, [] -> raise (Failure "HExtlib.split_nth")
+    | n, hd :: tl -> aux (hd :: acc) (n - 1) tl in
+  aux [] n l
+
+let list_last l =
+  let l = List.rev l in 
+  try List.hd l with exn -> raise (Failure "HExtlib.list_last")
+;;
+  
 (** {2 File predicates} *)
 
 let is_dir fname =