1 files changed, 4 insertions, 0 deletions
diff --git a/util/set.lua b/util/set.lua
index 892f1c9d..bb318adf 100644
--- a/util/set.lua
+++ b/util/set.lua
@@ -91,6 +91,10 @@ function new(list)
 		end
 	end
 	
+	function set:empty()
+		return not next(items);
+	end
+	
 	if list then
 		set:add_list(list);
 	end