* ext/tk/lib/tk/variable.rb: add TkVariable#+@ and -@ method.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25513 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Tue Oct 27 21:20:35 2009  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
+
+	* ext/tk/lib/tk/variable.rb: add TkVariable#+@ and -@ method.
+
 Tue Oct 27 16:36:52 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* string.c (chopped_length): get rid of unexpected exception.

ext/tk/lib/tk/variable.rb

@@ -1175,6 +1175,13 @@ end
     end
   end
 
+  def +@
+    self.numeric
+  end
+  def -@
+    -(self.numeric)
+  end
+
   def &(other)
     if other.kind_of?(Array)
       self.to_a & other.to_a