When to write an iterator?

Posted by Jon on Stack Overflow See other posts from Stack Overflow or by Jon
Published on 2010-03-24T17:37:00Z Indexed on 2010/03/24 17:43 UTC
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I know this is probably a silly question.. When would I need to write my own iterator? Is it just when designing my own container class? Are there any other times when I would want to create my own iterator?

Examples would be appropriated.

-Jon

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