this post was submitted on 11 Oct 2023
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Programming

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[–] [email protected] 0 points 1 year ago* (last edited 1 year ago)

Well, that's to be expected - the implementation of map expects a function that takes ownership of its inputs, so you get a type mismatch.

If you really want to golf things, you can tack your own map_ref (and friends) onto the Iterator trait. It's not very useful - the output can't reference the input - but it's possible!

I imagine you could possibly extend this to a combinator that returns a tuple of (Input, ref_map'd output) to get around that limitation, although I can't think of any cases where that would actually be useful.