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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. Saoirse Shipwreckt‏ @withoutboats Apr 14
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      Thinking about it a bit, it seems possible that a thorough investigation would show preferring external iterators as the biggest mistake Rust made

      1 reply 0 retweets 13 likes
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    2. Saoirse Shipwreckt‏ @withoutboats Apr 14
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      Internal iterators seem better for streaming iterators, self-referential iterators, nonlocal control flow in adapters

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    3. Saoirse Shipwreckt‏ @withoutboats Apr 14
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      At minimum I would say our for loop syntax should not be based on external iterators, since it gets none of the benefits

      3 replies 0 retweets 1 like
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    4. Saoirse Shipwreckt‏ @withoutboats Apr 14
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      Anyway this is all hypothetical: notes for the next language

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    5. yosh‏ @yoshuawuyts Apr 14
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      Replying to @withoutboats

      I hadn't heard of "internal vs external iteration" before I think yesterday? If I understand it correctly it's: // internal stream.for_each(|x| dbg!(x)); // external for x in stream { dbg!(x); } But feel like there might be more to it? Is it abt return types too?

      1 reply 0 retweets 4 likes
    6. ashley williams‏ @ag_dubs Apr 14
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      Replying to @yoshuawuyts @withoutboats

      i have the same q!

      1 reply 0 retweets 4 likes
    7. Saoirse Shipwreckt‏ @withoutboats Apr 14
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      Replying to @ag_dubs @yoshuawuyts

      Yea you’re right, it’s where for loop de sugars into the for_each example, rather than repeated calls to next

      1 reply 0 retweets 5 likes
    8. Saoirse Shipwreckt‏ @withoutboats Apr 14
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      Replying to @withoutboats @ag_dubs @yoshuawuyts

      This lets the iterator have more control over the control flow of iteration

      1 reply 0 retweets 4 likes
    9. Saoirse Shipwreckt‏ @withoutboats Apr 14
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      Replying to @withoutboats @ag_dubs @yoshuawuyts

      For example, one design could be for all the iterator-like things (streams, parallel iterators, “attached/streaming” iterators) to work with for loops, putting different bounds on the closure it desugars to (eg parallel requires that the loop body is Send, etc)

      1 reply 0 retweets 5 likes
      yosh‏ @yoshuawuyts Apr 14
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      Replying to @withoutboats @ag_dubs

      Oh wow, those all sound like things that'd be neat to have. Does that mean we can't have those in Rust, or mostly that it'll be more difficult (e.g. special casing)?

      7:28 AM - 14 Apr 2020
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        2. Saoirse Shipwreckt‏ @withoutboats Apr 14
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          Replying to @yoshuawuyts @ag_dubs

          It’s an open question. All external iterators can be made into internal iterators (which is why Iterator::for_each exists), so in theory we could probably add internal iterators in a backward compat way

          1 reply 0 retweets 4 likes
        3. Saoirse Shipwreckt‏ @withoutboats Apr 14
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          Replying to @withoutboats @yoshuawuyts @ag_dubs

          It’s relevant to consider this when working on for await loops, generators, attached streams, etc

          1 reply 0 retweets 2 likes
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