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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. elsie d. soundsystem‏ @mountain_ghosts 3 Jul 2019
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      is there a rust trait for "this type can be written to an i/o stream as a sequence of bytes"

      7 replies 0 retweets 0 likes
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    2. yosh‏ @yoshuawuyts 3 Jul 2019
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      Replying to @mountain_ghosts

      io::Read seems like the prime suspect. In the async world there's futures::io::AsyncRead which implements `write_into` to directly copy data into an AsyncWrite. Not sure if the sync world has a similar combinator, but the idea should be similar.

      1 reply 1 retweet 1 like
    3. elsie d. soundsystem‏ @mountain_ghosts 3 Jul 2019
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      Replying to @yoshuawuyts

      oh, yes, you might be right it's not writing to I/O but at least it avoids allocating lots of separate Vecs for each written object

      1 reply 0 retweets 1 like
    4. elsie d. soundsystem‏ @mountain_ghosts 3 Jul 2019
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      Replying to @mountain_ghosts @yoshuawuyts

      except Read writes into a fixed-size slice, not a growable buffer?

      1 reply 0 retweets 0 likes
    5. yosh‏ @yoshuawuyts 3 Jul 2019
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      Replying to @mountain_ghosts

      The slices could be backed by a growable buffer. It makes very few assumptions in its API.

      1 reply 0 retweets 0 likes
    6. elsie d. soundsystem‏ @mountain_ghosts 3 Jul 2019
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      Replying to @yoshuawuyts

      but you can't push to a &mut [u8], right?

      1 reply 0 retweets 0 likes
    7. elsie d. soundsystem‏ @mountain_ghosts 3 Jul 2019
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      Replying to @mountain_ghosts @yoshuawuyts

      the [u8] might be owned by a Vec but if you're only given a slice reference you can't append to it

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      yosh‏ @yoshuawuyts 3 Jul 2019
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      Replying to @mountain_ghosts

      That is accurate, but you can keep growing the buffer between each call on the caller's side until done

      2:53 PM - 3 Jul 2019 from Berlin, Germany
      2 replies 0 retweets 0 likes
        1. New conversation
        2. elsie d. soundsystem‏ @mountain_ghosts 3 Jul 2019
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          Replying to @yoshuawuyts

          I probably want something different -- the writable values themselves know how big they are, and I only want to write to the end of the buffer, not to random indexes, so I really to a writable stream or buffer, not a &mut [u8]

          1 reply 0 retweets 0 likes
        3. elsie d. soundsystem‏ @mountain_ghosts 3 Jul 2019
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          Replying to @mountain_ghosts @yoshuawuyts

          it's fine I can invent a trait for this, just wondered if there was something in std that was already what I want

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        1. yosh‏ @yoshuawuyts 3 Jul 2019
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          Replying to @yoshuawuyts @mountain_ghosts

          In general there is some interplay between the traits required. And that's where combinators such as `copy_into` become particularly nice to use.

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