From 901af1535f708d391d10e7c116d4a9538b89dac2 Mon Sep 17 00:00:00 2001
From: Matthew Wild <mwild1@gmail.com>
Date: Wed, 22 Apr 2009 18:03:02 +0100
Subject: util.set: Add set:empty() to discover if the set is the empty set

---
 util/set.lua | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'util/set.lua')

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
-- 
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