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wycats's profile
Yehuda Katz 🥨
Yehuda Katz 🥨
Yehuda Katz  🥨
Verified account
@wycats

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Yehuda Katz  🥨Verified account

@wycats

Tilde Co-Founder, OSS enthusiast and world traveler.

Portland, OR
yehudakatz.com
Joined August 2007

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    1. Nathan Froyd‏ @froydnj Jan 7

      Why does idiomatic Rust code pervasively parameterize over trait bounds, rather than simply taking trait objects? The speed argument smacks of premature optimization; what are the other reasons?

      9 replies 0 retweets 4 likes
    2. Yehuda Katz  🥨‏Verified account @wycats Jan 7
      Replying to @froydnj

      I used to feel this way, then joined Team impl Trait, which is ergonomically very similar to Trait objects without the object safety or performance issue of trait objects.

      1 reply 0 retweets 3 likes
    3. spooky twink divorcée (abolish ICE)‏ @withoutboats Jan 8
      Replying to @wycats @froydnj

      until you find out how much worse the compile time is when you monomorphize all the things

      1 reply 0 retweets 2 likes
      Yehuda Katz  🥨‏Verified account @wycats Jan 8
      Replying to @withoutboats @froydnj

      We should be able to do better. Many monomorphizations aren't creating very different functions.

      6:17 AM - 8 Jan 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Ted Mielczarek‏ @TedMielczarek Jan 8
          Replying to @wycats @withoutboats @froydnj

          I thought someone also proposed that the compiler should be able to handle simple cases like `fn foo<T: AsRef<str>>(t: T) {}` where it could generate simple generic functions that call a concrete function `fn foo(t: &str) {}` with the actual code.

          2 replies 0 retweets 3 likes
        3. Who ordered *that*?‏ @ManishEarth Jan 8
          Replying to @TedMielczarek @wycats and

          It's called "outlining" and yeah the compiler should be able to help here.

          1 reply 0 retweets 3 likes
        4. Yehuda Katz  🥨‏Verified account @wycats Jan 8
          Replying to @ManishEarth @TedMielczarek and

          fwiw I don't necessarily think impl Trait will make this much worse. Generics are already greatly preferred to trait objects culturally in rust.

          1 reply 0 retweets 0 likes
        5. Who ordered *that*?‏ @ManishEarth Jan 8
          Replying to @wycats @TedMielczarek and

          Impl trait in input position is just sugar, so it changes nothing. In an output position it avoids boxing is all.

          1 reply 0 retweets 0 likes
        6. Yehuda Katz  🥨‏Verified account @wycats Jan 8
          Replying to @ManishEarth @TedMielczarek and

          It could possibly cause people to "use generics more" but I doubt it will move the needle that much. People use the hell out of generics.

          1 reply 0 retweets 1 like
        7. Andy Gocke‏ @andygocke Jan 8
          Replying to @wycats @ManishEarth and

          The main problem with the "premature optimization" argument is that this kind of stuff is hellishly hard to find out from traces. Inefficient dispatch and similar problems make "peanut butter profiles"; they smear a little bit all over the profile.

          1 reply 0 retweets 2 likes
        8. Yehuda Katz  🥨‏Verified account @wycats Jan 8
          Replying to @andygocke @ManishEarth and

          It helps that this is compile time performance and not runtime perf.

          0 replies 0 retweets 0 likes
        9. End of conversation

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