memcached_adapter.diff

diff --git a/lib/identity_cache/memcached_adapter.rb b/lib/identity_cache/memcached_adapter.rb
index 9aa9e56..c817dd8 100644
--- a/lib/identity_cache/memcached_adapter.rb
+++ b/lib/identity_cache/memcached_adapter.rb
@@ -17,14 +17,11 @@ module IdentityCache
       super(servers, opts.merge(support_cas: true))
     end
 
-    %w{delete incr decr append prepend}.each do |meth|
-      define_method(meth) do |*args|
-        begin
-          super(*args)
-        rescue *NONFATAL_EXCEPTIONS
-        end
-      end
-    end
+    def delete(*args); without_raise { super(*args) }; end
+    def incr(*args); without_raise { super(*args) }; end
+    def decr(*args); without_raise { super(*args) }; end
+    def append(*args); without_raise { super(*args) }; end
+    def prepend(*args); without_raise { super(*args) }; end
 
     def get(key)
       value = super(key)
@@ -65,5 +62,11 @@ module IdentityCache
       false
     end
 
+    private
+    def without_raise
+      yield
+    rescue *NONFATAL_EXCEPTIONS
+    end
+
   end
 end