added skip function

[helm.git] / helm / software / components / extlib / hExtlib.ml

diff --git a/helm/software/components/extlib/hExtlib.ml b/helm/software/components/extlib/hExtlib.ml
index cdf26c5c7d2af6bf082a3a7b4e22b6b166ed45b4..6af86f9cd4d4ac0b620d004976ea6a83fc951a6e 100644 (file)
--- a/helm/software/components/extlib/hExtlib.ml
+++ b/helm/software/components/extlib/hExtlib.ml
@@ -148,6 +148,22 @@ let list_mapi f l =
      aux 0 l
 ;;
 
+let rec list_iter_default2 f l1 def l2 = 
+  match l1,l2 with
+    | [], _ -> ()
+    | a::ta, b::tb -> f a b; list_iter_default2 f ta def tb 
+    | a::ta, [] -> f a def; list_iter_default2 f ta def [] 
+;;
+
+let rec list_forall_default3 f l1 l2 def l3 = 
+  match l1,l2,l3 with
+    | [], [], _ -> true
+    | [], _, _
+    | _, [], _ -> raise (Invalid_argument "list_forall_default3")
+    | a::ta, b::tb, c::tc -> f a b c && list_forall_default3 f ta tb def tc
+    | a::ta, b::tb, [] -> f a b def && list_forall_default3 f ta tb def [] 
+;;
+
 let sharing_map f l =
   let unchanged = ref true in
   let rec aux b = function
@@ -499,3 +515,24 @@ let chop_prefix prefix s =
 let touch s =
   try close_out(open_out s) with Sys_error _ -> ()
 ;;
+
+let rec mk_list x = function
+  | 0 -> []
+  | n -> x :: mk_list x (n-1)
+;;
+
+let list_seq start stop =
+  let rec aux pos =
+    if pos = stop then []
+    else pos :: (aux (pos+1))
+  in
+    aux start
+;;
+
+let rec list_skip n l =
+  match n,l with
+  | 0,_ -> l
+  | n,_::l -> list_skip (n-1) l
+  | _, [] -> assert false
+;;
+