From 0d98ee54b5a332e5d6a42aebf85026da2d432d2f Mon Sep 17 00:00:00 2001
From: Matthew Wild <mwild1@gmail.com>
Date: Wed, 22 Apr 2009 18:03:42 +0100
Subject: util.set: Add set.xor() to get a set consisting of items not in both
 sets

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

(limited to 'util')

diff --git a/util/set.lua b/util/set.lua
index bb318adf..84bfe8c4 100644
--- a/util/set.lua
+++ b/util/set.lua
@@ -141,4 +141,8 @@ function intersection(set1, set2)
 	return set;
 end
 
+function xor(set1, set2)
+	return union(set1, set2) - intersection(set1, set2);
+end
+
 return _M;
-- 
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