New example for Ruby that shows how to implement a mark function. Also makes use of the tracking objects funcitonality.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@7519 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/ruby/mark_function/runme.rb

@@ -0,0 +1,23 @@
+require 'example'
+
+# create a zoo
+zoo = Example::Zoo.new
+
+begin
+  # Add in an couple of animals
+  tiger1 = Example::Animal.new("tiger1")
+  zoo.add_animal(tiger1)
+  
+  # unset variables to force gc
+  tiger = nil
+end
+
+GC.start
+
+#  Now get the tiger again
+tiger2 = zoo.get_animal(0)
+
+# Call a method to verify the animal is still valid and not gc'ed
+if tiger2.get_name != "tiger1"
+    raise RuntimeError, "Wrong animal name"
+end