this post was submitted on 10 Apr 2024
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You're right, I wouldn't say iterators aren't a zero-cost abstraction. But most abstractions are also leaky -- it's just the extent in which the leakiness is exposed that makes them more or less effective. As such, saying to just use
retain_mut
instead of the iterator approach highlights the shortcoming of the abstraction. But if the same results could be achieved while still using the same iterator, that would make that abstraction more useful and consistent. And that's great, because that means we need to worry less when using iterators :)