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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    1. Arseny Kapoulkine‏ @zeuxcg Feb 10
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      • Report NetzDG Violation

      Individually, many proposals make sense. Together they are insanity to the point of endangering the future of C++. - Bjarne Stroustrup, 2018.pic.twitter.com/53jehdZfQi

      40 replies 102 retweets 509 likes
    2. Tim Sweeney‏ @TimSweeneyEpic Feb 10
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      Replying to @zeuxcg

      Agreed. The grandiose std abstractions-for-their-own-sake are insanity.

      6 replies 3 retweets 60 likes
    3. Matthäus G. Chajdas‏ @NIV_Anteru Feb 10
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      Replying to @TimSweeneyEpic @zeuxcg

      What exactly is the complaint here? You need to spell out somewhere what it means to behave like a bool, and that's how it looks like. It's not as much an abstraction as it's turning something which would be spec language otherwise into code.

      4 replies 1 retweet 10 likes
    4. Tim Sweeney‏ @TimSweeneyEpic Feb 10
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      Replying to @NIV_Anteru @zeuxcg

      Two things. First, bool works fine and doesn’t need an abstraction. Second, this is a fake abstraction because it breaks fundamental properties of bools, such as short-circuit evaluation.

      3 replies 3 retweets 56 likes
    5. dtoadq‏ @dtoadq Feb 11
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      Replying to @TimSweeneyEpic @NIV_Anteru @zeuxcg

      It doesn't break anything. A boolean<B> must have short-circuit evaluation on && and ||. Also it's not abstracting bool, it's implicitly abstracting types that behave like a boolean w/o need for a conversion. Very useful for libraries, not for applications.

      1 reply 0 retweets 0 likes
      Tim Sweeney‏ @TimSweeneyEpic Feb 11
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      Replying to @dtoadq @NIV_Anteru @zeuxcg

      How can it short circuit evaluation on a&&b when both are values?

      2:58 PM - 11 Feb 2020
      • 1 Like
      • 𝓙𝓸𝓷𝓪𝓼 𝓑𝓮𝓷𝓳𝓪𝓶𝓲𝓷
      2 replies 0 retweets 1 like
        1. New conversation
        2. Alessa 'Codekitten' Baker‏ @codekittah Feb 11
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          Replying to @TimSweeneyEpic @dtoadq and

          This is really a silly question. I'm hella new to C++ in general. But if the first argument in an AND or OR fails and implies a short-circut eval, then why doesn't C++ assume XAND or XOR to be required? Please be nice to me. xD

          1 reply 0 retweets 1 like
        3. dtoadq‏ @dtoadq Feb 11
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          Replying to @codekittah @TimSweeneyEpic and

          there is no XAND. XOR '^' is a bitwise operation, not a logical one. It operates on bits. Thus even if 5 && 3 == true, 5 ^ 3 would be 6, not false. Btw you can't even short-circuit them as the final value depends on both parameters, even for a logical XOR implementation.

          1 reply 0 retweets 0 likes
        4. 3 more replies
        1. dtoadq‏ @dtoadq Feb 11
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          Replying to @TimSweeneyEpic @NIV_Anteru @zeuxcg

          bools are values too so I'm not sure what you mean. The code gauruntees that [b1 && b2, b1 && bool(b2), bool(b1) && b2] are equal to and have the same short-circuit evaluation as [bool(b1) && bool(b2)]. It's a bit silly but it's also the precise language definition of a bool.

          0 replies 0 retweets 0 likes
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