From 8d478b8bacbb08d9edb6d8d1fbdea241f013b1cb Mon Sep 17 00:00:00 2001
From: herbelin
Date: Wed, 20 Nov 2002 20:33:24 +0000
Subject: Ajout option_fold_left2

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@3258 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 lib/util.ml  | 4 ++++
 lib/util.mli | 2 ++
 2 files changed, 6 insertions(+)

(limited to 'lib')

diff --git a/lib/util.ml b/lib/util.ml
index a8dd17e8f2..885278da7a 100644
--- a/lib/util.ml
+++ b/lib/util.ml
@@ -559,6 +559,10 @@ let option_app f = function
   | None -> None
   | Some x -> Some (f x)
 
+let option_fold_left2 f e a b = match (a,b) with
+  | Some x, Some y -> f e x y
+  | _ -> 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 d7194e389d..85ae3f2eb0 100644
--- a/lib/util.mli
+++ b/lib/util.mli
@@ -174,6 +174,8 @@ val interval : int -> int -> int list
 val in_some : 'a -> 'a option
 val out_some : 'a option -> 'a
 val option_app : ('a -> 'b) -> 'a option -> 'b option
+val option_fold_left2 : 
+  ('a -> 'b -> 'c -> 'a) -> 'a -> 'b option -> 'c option -> 'a
 val option_iter : ('a -> unit) -> 'a option -> unit
 val option_compare : ('a -> 'b -> bool) -> 'a option -> 'b option -> bool 
 val option_smartmap : ('a -> 'a) -> 'a option -> 'a option
-- 
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