Status: IN
Two independently characterized meta-patterns address the object proliferation costs inherent in composition-based design: deferred duplication (Memento incremental deltas, copy-on-write Proxy) delays creation of independent copies until modification forces differentiation, while null objects (NullIterator, null Strategy) avoid absence-handling overhead by providing degenerate interface-conforming instances — together constituting the GoF's implicit cost-management infrastructure that makes the composition paradigm practically sustainable.
Deferred duplication and null objects independently address composition's object proliferation costs from temporal and structural directions
Depends on (SL): deferred-duplication-principle-spans-temporal-and-spatial-domains, null-object-meta-pattern-in-strategy-and-iterator