null-iterator-always-done

Status: IN

A NullIterator whose IsDone always returns true enables uniform traversal of Composite structures by eliminating the need to special-case leaf nodes that have no children to iterate.

Source: entries/2026/06/17/gof-oo-chunk-17.md

Depended on by

• null-iterator-enables-composite-transparency
• null-iterator-propagates-transparency-cost-across-pattern-boundaries
• null-object-meta-pattern-in-strategy-and-iterator

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