lib/ruby_ext/declarative_cache.rb in ruby-ext-0.4.1 vs lib/ruby_ext/declarative_cache.rb in ruby-ext-0.4.2

@@ -61,18 +61,21 @@
             
             alias_method als, method
                     
             define_method method do |*args| 
               unless results = instance_variable_get(iv)
-                results = {}
+                results = Hash.new(NotDefined)
                 instance_variable_set iv, results
               end
+              
+              result = results[args]
                         
-              unless results.include? args
-                results[args] = send als, *args
+              if result.equal? NotDefined 
+                result = send als, *args
+                results[args] = result
               end
             
-              results[args]
+              result
             end
           end
         end
       end
       
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