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yoshuawuyts's profile
yosh
yosh
yosh
@yoshuawuyts

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yosh

@yoshuawuyts

Software researcher. he/they

Berlin, UTC+2
blog.yoshuawuyts.com
Joined May 2009

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    1. yosh‏ @yoshuawuyts 5 Jul 2019
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      Does anyone have an example of going from an Iterator of type Result<T, SomeError> to Iterator of type T, while handling all errors? I can see how this could be done with `for x in y` syntax, but I'm wondering if this can be done using combinators. Can it?

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    2. yosh‏ @yoshuawuyts 5 Jul 2019
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      Or is this simply a limitation of combinators because closures can't return to the top-level scope, whereas blocks *can*. Ugh, my intuition is telling me it's exactly this, and I really don't like it. Or well, it could be done, but it would likely require buffering. Which is :(

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    3. yosh‏ @yoshuawuyts 5 Jul 2019
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      I'm mostly just hoping I've missed something, and someone here can spot what I've missed.

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      yosh‏ @yoshuawuyts 5 Jul 2019
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      Oops, I should've clarified: I don't mean "all errors". I mean: "keep forwarding input into a new stream, but exit on the first error". Also without buffering.

      5:17 AM - 5 Jul 2019
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        1. yosh‏ @yoshuawuyts 5 Jul 2019
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          Everyone in this thread is incredibly helpful! 😊

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        2. James<'a, N> where N: ArrayLength<u8>,‏ @bitshiftmask 5 Jul 2019
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          Replying to @yoshuawuyts

          Yeah, if you just want to do a thing for each item, try_for_each is what you want. If you want to continue method chaining, It does seem like https://docs.rs/try_map/0.3.1/try_map/trait.FallibleMapExt.html … (or something similar) would be what you want. So: get_some_res_stream() .try_map(...)? .map() .map()

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        3. yosh‏ @yoshuawuyts 5 Jul 2019
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          Replying to @bitshiftmask

          Hmm, at the risk of sounding like a broken record: wouldn't try_map still also have to do internal buffering? e.g. it can't return a Result until all items have been iterated over -- which means in the case of an infinite iterator it either OOMs or runs into an error.

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        1. Pascal‏ @killercup 5 Jul 2019
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          Replying to @yoshuawuyts

          no idea how to best do this without buffering but since i also misunderstood your original question, here's both of the simple approaches: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=7a7270c5998c3772a3bfab893356ca26 …

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        1. 「eater」  🥰‏ @__eater__ 5 Jul 2019
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          Replying to @yoshuawuyts

          `.try_for_each`? https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each …

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