The Iterator Design Pattern

Iterator Issues

nWho controls iteration?

nDoes collection know about iterator?

nHow robust is the iterator? (DP)

nWho cleans up heap-based iterators?

nHow are recursive collections handled?

nWhat about boundaries? (NullIterator)


	Here are a few issues that you can think about as we look at some concrete examples. For the most part, these issues all have relatively good solutions.