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whitequark's profile
whitequark
whitequark
whitequark
@whitequark

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whitequark

@whitequark

http://whitequark.org  · http://llvm.moe  · http://powerlinesinanime.tumblr.com  · working on quantum computers for a living · DMs open · she

Joined July 2010

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    1. Who ordered *that*?‏ @ManishEarth Sep 19

      I kinda feel like complaints that using indexing over refs is "bypassing the borrow checker" miss the point. That's like complaining allocation "bypasses the stack".

      2 replies 2 retweets 11 likes
      Show this thread
      whitequark‏ @whitequark Sep 19
      Replying to @ManishEarth

      (replying to the first tweet but I've read the entire thread) no, I think there's actually significant insight here. Rust doesn't JUST try to ensure memory safety. you could do that with a C compiler with sanitizers built-in. Rust also makes strong claims about ensuring…

      1:23 PM - 19 Sep 2018
      • 5 Likes
      • Vivitsu Maharaja Steve Canon Brybo Who ordered *that*? Theodoros Chatzigiannakis
      1 reply 0 retweets 5 likes
        1. New conversation
        2. whitequark‏ @whitequark Sep 19
          Replying to @whitequark @ManishEarth

          semantic correctness. For example, compare Rust enums with something Go or Java would have. That Rust requires you to use indexes to implement something like ECS is absolutely a problem with the language.

          2 replies 0 retweets 4 likes
        3. whitequark‏ @whitequark Sep 19
          Replying to @whitequark @ManishEarth

          Imagine you had a system where you absolutely, positively would not want to use heap. Something embedded. (I have such a system at work!) Then heap allocation would be a problem with the language, too, in this problem domain.

          1 reply 0 retweets 3 likes
        4. whitequark‏ @whitequark Sep 19
          Replying to @whitequark @ManishEarth

          The difference is that absolutely-no-heap systems are an obscure corner of all software and ECS systems are everywhere.

          3 replies 0 retweets 2 likes
        5. Who ordered *that*?‏ @ManishEarth Sep 19
          Replying to @whitequark

          My argument is precisely that stepping out of Rust's *default* guarantees is a deliberate feature of the language and not exiting the problem domain. You're right that it's suboptimal that ECS requires this, but I don't think that's the original point.

          2 replies 0 retweets 1 like
        6. Who ordered *that*?‏ @ManishEarth Sep 19
          Replying to @ManishEarth @whitequark

          Er, suboptimal that cyclic graph structures require this. ECS systems are array based *anyway*

          1 reply 0 retweets 1 like
        7. dangle wrangler  🏴‏ @kazimuth Sep 19
          Replying to @ManishEarth @whitequark

          then again, there's a name for "system that automatically manages memory arranged in a cyclic graph structure", and not having one of those is one of rust's big selling points

          1 reply 0 retweets 3 likes
        8. whitequark‏ @whitequark Sep 19
          Replying to @kazimuth @ManishEarth

          I'm sad we killed Gc<T>, actually.

          2 replies 0 retweets 5 likes
        9. Who ordered *that*?‏ @ManishEarth Sep 19
          Replying to @whitequark @kazimuth

          There's scope for both a pure library version (rust-gc exists, it's kinda naïve but safe) and one the compiler helps with via stack maps (I worked on this earlier, but ultimately it was low priority so we never implemented it)

          0 replies 0 retweets 2 likes
        10. End of conversation

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