null object pattern

The null object pattern is also supported in multiple value processing.

One solution to this may be the application of the Null Object pattern.

Nullable type implementations usually adhere to the null object pattern.

Using the null object pattern, one can create a special version of the procedure but only for null nodes:

The null object pattern solves this problem by providing a code special class which can be instantiated bound to an pointer or reference.

The null object pattern can also be used to act as a stub for testing, if a certain feature, such as a database, is not available for testing.