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burntsushi5's profile
Andrew Gallant
Andrew Gallant
Andrew Gallant
@burntsushi5

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Andrew Gallant

@burntsushi5

I love to code.

Marlborough, MA
blog.burntsushi.net
Joined October 2016

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    1. William D. Jones‏ @cr1901 Jan 6
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      @burntsushi5 https://www.reddit.com/r/rust/comments/b5bpbb/drew_devault_rust_is_not_a_good_c_replacement/ejchrx1/ … Hi, I found your comment after looking up the author of a recent certain blog post. What is zero-overhead polymorphism and why is it a major source of complexity in Rust (and why does it make unsafe harder)?

      2 replies 0 retweets 0 likes
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    2. Andrew Gallant‏ @burntsushi5 Jan 7
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      Replying to @cr1901

      Hmm... That question is really quite impossible to answer on twitter. Short answer is this: zero-overhead polymorphism is polymorphism that doesn't require runtime dispatch. i.e., Generic code is monomorphized so that you don't pay for any runtime dispatch.

      1 reply 0 retweets 1 like
    3. Andrew Gallant‏ @burntsushi5 Jan 7
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      Replying to @burntsushi5 @cr1901

      It's a major source of complexity because it enables one to write highly generic code. In many cases, the programmer writes code that is more generic than it needs to be. For me personally, generic abstract code is much harder to understand than concrete non-generic code.

      1 reply 0 retweets 1 like
    4. Andrew Gallant‏ @burntsushi5 Jan 7
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      Replying to @burntsushi5 @cr1901

      Rust's core value proposition is that it provides stronger guarantees of memory safety because you can write most code in its safe subset. i.e., without using "unsafe." This is only possible because many safe generic abstractions have been built that use "unsafe" internally.

      1 reply 0 retweets 1 like
    5. Andrew Gallant‏ @burntsushi5 Jan 7
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      Replying to @burntsushi5 @cr1901

      If you remove the ability to write generic code, then you also remove the ability to create easily reusable safe abstractions. This would in turn very likely increase the use of "unsafe" in Rust code, which would, to an extent, diminish its value proposition.

      1 reply 0 retweets 1 like
      Andrew Gallant‏ @burntsushi5 Jan 7
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      Replying to @burntsushi5 @cr1901

      Therefore, generics aren't just a programmer convenience in Rust. They truly are central to the thing that Rust is trying to provide: zero cost abstractions + memory safety.

      8:04 AM - 7 Jan 2020
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        2. William D. Jones‏ @cr1901 Jan 7
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          Replying to @burntsushi5

          Wow, that is an excellent answer and exactly what I was looking for, thanks! I have a lot to mull over...

          1 reply 0 retweets 1 like
        3. William D. Jones‏ @cr1901 Jan 7
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          Replying to @cr1901 @burntsushi5

          Short context: In the context of that deliberately abrasive blog post, Rust not having multiple implementations (besides mrustc, which is amazing) _does_ in fact bother me. And I took your post re: zero-overhead generics to be a main source of _implementation_ complexity.

          1 reply 0 retweets 0 likes
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