From: Matthew Wild <mwild1@gmail.com>
Date: Wed, 22 Apr 2009 17:03:02 +0000 (+0100)
Subject: util.set: Add set:empty() to discover if the set is the empty set
X-Git-Url: https://git.enpas.org/?a=commitdiff_plain;ds=sidebyside;h=35d012211b0504a3076bf55e3d02988329d63203;p=prosody.git

util.set: Add set:empty() to discover if the set is the empty set
---

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