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BRIAN_____'s profile
Brian Smith
Brian Smith
Brian Smith
@BRIAN_____

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Brian Smith

@BRIAN_____

Code farmer. Security, crypto, performance, networking, usability. Rust, C++, C, Haskell, DSLs, etc. *ring*, webpki, crypto-bench, mozilla::pkix.

Honolulu & San Francisco
briansmith.org
Joined April 2008

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    1. nrc‏ @nick_r_cameron 14 Jan 2016

      Contrary to my rfc, I think I have been persuaded that unions should be structs, not enums. The primary distinction between an enum and a...

      1 reply 0 retweets 0 likes
    2. nrc‏ @nick_r_cameron 14 Jan 2016
      Replying to @nick_r_cameron

      Struct is how the data is accessed, not how the data is stored. And field access is highly desirable for unions.

      1 reply 0 retweets 1 like
    3. Brian Smith‏ @BRIAN_____ 14 Jan 2016
      Replying to @nick_r_cameron

      @nick_r_cameron One could just add "union" as a separate thing and be done with it. A union is not a struct or an enum. Abstraction leakage.

      2 replies 0 retweets 0 likes
    4. nrc‏ @nick_r_cameron 14 Jan 2016
      Replying to @BRIAN_____

      @BRIAN_____ I think a union is just a struct where the fields are stored on top of each other, rather than sequentially.

      1 reply 0 retweets 0 likes
    5. Brian Smith‏ @BRIAN_____ 14 Jan 2016
      Replying to @nick_r_cameron

      @nick_r_cameron So, not a struct, then.

      3 replies 0 retweets 0 likes
    6. Brian Smith‏ @BRIAN_____ 14 Jan 2016
      Replying to @BRIAN_____

      @nick_r_cameron The question is, does it help end-users to have unions be a special kind of struct/enum rather than its own thing. IMO, no.

      1 reply 0 retweets 0 likes
    7. nrc‏ @nick_r_cameron 14 Jan 2016
      Replying to @BRIAN_____

      @BRIAN_____ I don't think it harms them either, and helps discourage use. Unions are intended only to make C interop easier

      1 reply 0 retweets 0 likes
    8. Brian Smith‏ @BRIAN_____ 14 Jan 2016
      Replying to @nick_r_cameron

      @nick_r_cameron #include <header.h> is the ultimate solution to C interop, IMO. C++ is probably too complex for that.

      1 reply 0 retweets 0 likes
      Brian Smith‏ @BRIAN_____ 14 Jan 2016

      @nick_r_cameron That I have to manually keep the Rust #[repr(C)] declaration of a struct in sync with the original definition is madness.

      5:23 PM - 14 Jan 2016
      2 replies 0 retweets 0 likes
        1. nrc‏ @nick_r_cameron 14 Jan 2016
          Replying to @BRIAN_____

          @BRIAN_____ This can (and should) be automated using bindgen. If this is not ergonomic we should fix the tools.

          0 replies 0 retweets 0 likes
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        2. Brian Smith‏ @BRIAN_____ 14 Jan 2016
          Replying to @BRIAN_____

          @nick_r_cameron (And, more on topic, the same with union. Rust doesn't need its own union type if it can parse C unions.)

          1 reply 0 retweets 0 likes
        3. nrc‏ @nick_r_cameron 14 Jan 2016
          Replying to @BRIAN_____

          @BRIAN_____ I would much rather have a tooling step, than expand Rust to understand C (even in a part).

          1 reply 0 retweets 0 likes
        4. Brian Smith‏ @BRIAN_____ 14 Jan 2016
          Replying to @nick_r_cameron

          @nick_r_cameron OTOH, I don't trust bindgen to do the same as GCC and clang, so I don't use it.

          1 reply 0 retweets 0 likes
        5. nrc‏ @nick_r_cameron 14 Jan 2016
          Replying to @BRIAN_____

          @BRIAN_____ would you trust the Rust compiler to do the same? We should improve bindgen until you do trust it. Do you have specific issues?

          1 reply 0 retweets 0 likes
        6. Brian Smith‏ @BRIAN_____ 14 Jan 2016
          Replying to @nick_r_cameron

          @nick_r_cameron I guess bindgen! is just different syntax for #include. I guess. I'd trust it when rustc team trusts it enough to bundle it.

          2 replies 0 retweets 1 like
        7. nrc‏ @nick_r_cameron 14 Jan 2016
          Replying to @BRIAN_____

          @BRIAN_____ I would very much like to move in that direction. Better ergonomics around FFI is something I want to improve this year

          1 reply 1 retweet 1 like
        8. Brian Smith‏ @BRIAN_____ 14 Jan 2016
          Replying to @nick_r_cameron

          @nick_r_cameron Why not just make union support part of bindgen, then?

          0 replies 0 retweets 0 likes
        9. End of conversation

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