# HG changeset patch
# User Matthew Wild <mwild1@gmail.com>
# Date 1240419822 -3600
# Node ID a82268d507fcf5cdd555ccbd7c97815091004c5f
# Parent  4ead039747590e53fee4e13c3ba166c3cf078718
util.set: Add set.xor() to get a set consisting of items not in both sets

diff -r 4ead03974759 -r a82268d507fc util/set.lua
--- a/util/set.lua	Wed Apr 22 18:03:02 2009 +0100
+++ b/util/set.lua	Wed Apr 22 18:03:42 2009 +0100
@@ -141,4 +141,8 @@
 	return set;
 end
 
+function xor(set1, set2)
+	return union(set1, set2) - intersection(set1, set2);
+end
+
 return _M;