X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fextlib%2FhExtlib.ml;h=c16b11159c38ccde56621da9d3b9c97c611419c9;hb=393187c5f5a6e71d467ab04b65f3a935701724fb;hp=fe587e297c50b5631d992852e12b2ae9bc84486c;hpb=e48ac5af4e17dbac21b7e2767d4bd17f47ab19ea;p=helm.git

diff --git a/helm/software/components/extlib/hExtlib.ml b/helm/software/components/extlib/hExtlib.ml
index fe587e297..c16b11159 100644
--- a/helm/software/components/extlib/hExtlib.ml
+++ b/helm/software/components/extlib/hExtlib.ml
@@ -148,6 +148,34 @@ 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
+    | [] as t -> unchanged := b; t
+    | he::tl ->
+        let he1 = f he in
+        he1 :: aux (b && he1 == he) tl
+  in
+  let l1 = aux true l in
+  if !unchanged then l else l1
+;;
+        
 let rec list_uniq ?(eq=(=)) = function 
   | [] -> []
   | h::[] -> [h]
@@ -487,3 +515,8 @@ 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)
+;;