X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=components%2Fextlib%2FhExtlib.ml;h=073c5695959480e657070af45a68ec3029132ef6;hb=2f857bf7f4d1bb73d08d270af9d7ad36a365a3c4;hp=d4572789ad55f39795d000fd09192e839cfee02f;hpb=ad17757edcc6cf75be576268fab8cf52751d679a;p=helm.git

diff --git a/components/extlib/hExtlib.ml b/components/extlib/hExtlib.ml
index d4572789a..073c56959 100644
--- a/components/extlib/hExtlib.ml
+++ b/components/extlib/hExtlib.ml
@@ -164,6 +164,17 @@ let list_rev_map_filter f l =
    in 
    aux [] l
 
+let list_rev_map_filter_fold f v l =
+   let rec aux v a = function
+      | []       -> v, a
+      | hd :: tl -> 
+         begin match f v hd with
+	    | v, None   -> aux v a tl
+	    | v, Some b -> aux v (b :: a) tl 
+         end
+   in 
+   aux v [] l
+
 let list_concat ?(sep = []) =
   let rec aux acc =
     function