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rustlang's profile
Rust Language
Rust Language
Rust Language
@rustlang

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Rust Language

@rustlang

A programming language empowering everyone to build reliable and efficient software.

rust-lang.org
Joined July 2010

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    1. Sunjay‏ @Sunjay03 5 Jan 2018
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      • Report NetzDG Violation

      Integer literals in @rustlang can't be passed to functions that take floating point types. I've known this for a while, but are the reasons why written somewhere? Why was it necessary to make people write f(2.0) instead of just f(2)? Is there a reason against allowing this?

      3 replies 0 retweets 1 like
    2. Dan‏ @dyladan 6 Jan 2018
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      Replying to @Sunjay03 @rustlang

      Automatically casting hides the (small) performance cost of the conversion and allowing a float to be written without the .0 hides the fact that is is a float.

      1 reply 0 retweets 0 likes
    3. Sunjay‏ @Sunjay03 6 Jan 2018
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      Replying to @dyladan @rustlang

      Sorry, I must not be being clear. I'm not suggesting *any* automatic or implicit casting. I totally agree that doing that is BAD. I'm only talking about literals. It should be valid to write f(2) and f(2.0). Integer literals, in this one specific case, should be valid.

      1 reply 0 retweets 0 likes
    4. Dan‏ @dyladan 6 Jan 2018
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      Replying to @Sunjay03 @rustlang

      But the first option there implies that f can take an int. Without looking at the sig there's no way to know it's actually a float. Not a big deal (arguably) for small codebases written by one person, but a large codebase with many devs could have issues

      1 reply 0 retweets 0 likes
    5. Sunjay‏ @Sunjay03 6 Jan 2018
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      Replying to @dyladan @rustlang

      I don't know about how big of an issue it would actually be. First of all, I think it is common to know about the type signature of the function you're calling. Second, I don't think adding this extra thing you have to remember adds much value. Is 2 really different from 2.0?

      1 reply 0 retweets 0 likes
    6. Dan‏ @dyladan 6 Jan 2018
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      Replying to @Sunjay03 @rustlang

      If you're writing it sure, but what if you're reading or modifying someone else's code?

      1 reply 0 retweets 1 like
      Rust Language‏ @rustlang 6 Jan 2018
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      Replying to @dyladan @Sunjay03

      Both of you have laid out the arguments from both sides. We picked the conservative path for now. We can always add this, but once added, can never remove

      2:24 PM - 6 Jan 2018
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      • Sunjay
      1 reply 0 retweets 1 like
        1. Sunjay‏ @Sunjay03 6 Jan 2018
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          Replying to @rustlang @dyladan

          Agreed! Thanks for the discussion!

          0 replies 0 retweets 0 likes
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