Mercurial > urweb

diff lib/ur/list.ur @ 916:b873feb3eb52

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
dragList almost kinda works
author Adam Chlipala <adamc@hcoop.net>
date Tue, 08 Sep 2009 10:18:19 -0400
parents ed06e25c70ef
children 166ea3944b91
line wrap: on
line diff
--- a/lib/ur/list.ur	Tue Sep 08 07:48:57 2009 -0400
+++ b/lib/ur/list.ur	Tue Sep 08 10:18:19 2009 -0400
@@ -44,6 +44,16 @@
         foldlAbort'
     end
 
+val length = fn [a] =>
+                let
+                    fun length' acc (ls : list a) =
+                        case ls of
+                            [] => acc
+                          | _ :: ls => length' (acc + 1) ls
+                in
+                    length' 0
+                end
+
 val rev = fn [a] =>
              let
                  fun rev' acc (ls : list a) =