Ajout option_fold_right

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@4251 85f007b7-540e-0410-9357-904b9bb8a0f7

2 files changed, 5 insertions, 0 deletions

diff --git a/lib/util.ml b/lib/util.ml
index 46ac2e5ceb..d6e160efd7 100644
--- a/lib/util.ml
+++ b/lib/util.ml
@@ -603,6 +603,10 @@ let option_fold_left2 f e a b = match (a,b) with
   | Some x, Some y -> f e x y
   | _ -> e
 
+let option_fold_right f a e = match a with
+  | Some x -> f x e
+  | _ -> e
+
 let option_compare f a b = match (a,b) with
   | None, None -> true
   | Some a', Some b' -> f a' b'
diff --git a/lib/util.mli b/lib/util.mli
index 82e547d3e8..85c828abf5 100644
--- a/lib/util.mli
+++ b/lib/util.mli
@@ -178,6 +178,7 @@ val in_some : 'a -> 'a option
 val out_some : 'a option -> 'a
 val option_app : ('a -> 'b) -> 'a option -> 'b option
 val option_cons : 'a option -> 'a list -> 'a list
+val option_fold_right : ('a -> 'b -> 'b) -> 'a option -> 'b -> 'b
 val option_fold_left2 : ('a -> 'b -> 'c -> 'a) -> 'a -> 'b option ->
   'c option -> 'a
 val option_iter : ('a -> unit) -> 'a option -> unit