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diff util/set.lua @ 1029:4ead03974759

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util.set: Add set:empty() to discover if the set is the empty set
author Matthew Wild <mwild1@gmail.com>
date Wed, 22 Apr 2009 18:03:02 +0100
parents 594a07e753a0
children a82268d507fc
line wrap: on
line diff
--- a/util/set.lua	Wed Apr 22 18:00:45 2009 +0100
+++ b/util/set.lua	Wed Apr 22 18:03:02 2009 +0100
@@ -91,6 +91,10 @@
 		end
 	end
 	
+	function set:empty()
+		return not next(items);
+	end
+	
 	if list then
 		set:add_list(list);
 	end