diff -r 90cbf68b9227 -r bf8300fa4238 TFL/utils.sml
--- a/TFL/utils.sml	Tue Sep 05 18:53:21 2000 +0200
+++ b/TFL/utils.sml	Tue Sep 05 18:53:42 2000 +0200
@@ -1,11 +1,31 @@
-(*  Title:      TFL/utils
+(*  Title:      TFL/utils.sml
     ID:         $Id$
     Author:     Konrad Slind, Cambridge University Computer Laboratory
     Copyright   1997  University of Cambridge
 
-Basic utilities
+Basic utilities.
 *)
 
+signature Utils_sig =
+sig
+  exception ERR of {module:string,func:string, mesg:string}
+
+  val can   : ('a -> 'b) -> 'a -> bool
+  val holds : ('a -> bool) -> 'a -> bool
+  val C : ('a -> 'b -> 'c) -> 'b -> 'a -> 'c
+
+  val itlist : ('a -> 'b -> 'b) -> 'a list -> 'b -> 'b
+  val rev_itlist : ('a -> 'b -> 'b) -> 'a list -> 'b -> 'b
+  val end_itlist : ('a -> 'a -> 'a) -> 'a list -> 'a
+  val itlist2 :('a -> 'b -> 'c -> 'c) -> 'a list -> 'b list -> 'c -> 'c
+  val pluck : ('a -> bool) -> 'a list -> 'a * 'a list
+  val zip3 : 'a list -> 'b list -> 'c list -> ('a*'b*'c) list
+  val take  : ('a -> 'b) -> int * 'a list -> 'b list
+  val sort  : ('a -> 'a -> bool) -> 'a list -> 'a list
+
+end;
+
+
 structure Utils = 
 struct