this post was submitted on 17 Jan 2022
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Rust Programming

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"Rust needs evert(), which turns an iterator over Result of T into a Result of a collection of T or a collection of errors" Thoughts on this? (cybre.space)
submitted 2 years ago by AgreeableLandscape@lemmy.ml to c/rust@lemmy.ml
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[–] Yujiri@lemmy.ml 6 points 2 years ago (2 children)

Uh... what?

So I understand the type signature she's asking for is Iter<Result<T, E>> -> Result<Iter<T>, Iter<E>>

This suggestion could really use some use case examples. It sounds sufficiently obscure to me that I wouldn't complain about having to write my own a function for this

Also, where does the name evert come from?

[–] Ephera@lemmy.ml 1 points 2 years ago* (last edited 2 years ago) (1 children)

I can see this being useful for parsing. You often want to report all of the parsing errors to the user in one go, so collecting them into a list or iterator is useful.

But yeah, still relatively obscure.

And I'm guessing, "evert" is simply the respective English word: https://en.wiktionary.org/wiki/evert
As a non-native speaker, I didn't know that word either...

[–] Yujiri@lemmy.ml 2 points 2 years ago

I'm a native english speaker and I didn't know that word :o