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

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Tim Sweeney

@TimSweeneyEpic

Epic Games CEO, Founder

epicgames.com
Joined August 2013

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    Tim Sweeney‏ @TimSweeneyEpic 27 May 2019

    Algol (1958) is the spiritual parent language of the C/C++/C#/Java family. It introduced the accursed "int x" syntax which Niklaus Wirth tried to undo with Pascal and other designs. Yet the notation persists and perpetures a 60-year confusion around types and values.

    8:09 AM - 27 May 2019
    • 13 Retweets
    • 137 Likes
    • Panos Petropoulos Arto Bendiken Xiang Nir GrEE3N patrik Jaiden Gerig Jeremie Pelletier TheBorinqueneers
    7 replies 13 retweets 137 likes
      1. New conversation
      2. Tim Sweeney‏ @TimSweeneyEpic 27 May 2019

        The confusion is this: In some places "int" means "the type of all integers", such as in "array<int>". Elsewhere it's an indeterminate placeholder to be filled in with an actual integer, such as "void f(int x) {return x+1;}" or "int f(int,int)".

        4 replies 0 retweets 28 likes
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      3. Tim Sweeney‏ @TimSweeneyEpic 27 May 2019

        This confusion doesn't exist in Pascal or Typescript syntax. "int" refers to the type, and ":int" is always an abstract placeholder for a particular value. The type-value dissonance is stretched to the breaking point when they're mixed as in C++ template partial specialization.

        7 replies 2 retweets 50 likes
        Show this thread
      4. End of conversation
      1. New conversation
      2. heynownow‏ @heynownow 27 May 2019
        Replying to @TimSweeneyEpic

        Who do we blame for this Bjarne Stroustrup?

        1 reply 0 retweets 2 likes
      3. Dr. Cat - Jubilant‏ @DoktorCat 27 May 2019
        Replying to @heynownow @TimSweeneyEpic

        I think he did a pretty decent job, for acting without the benefit of decades of using higher level languages that we have now to give us more insight and hindsight. Moving from 8 bit assembly to using “any higher level language at all” felt like such a blessing in my career!

        0 replies 0 retweets 1 like
      4. End of conversation
      1. 𝓡𝓪𝓷𝓭𝓸𝓶  ⭕️ 𝓗𝓮𝓻𝓸‏ @RandomHeroVeVe 27 May 2019
        Replying to @TimSweeneyEpic

        Your brain is on a much higher level than mine ❤️

        0 replies 0 retweets 0 likes
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      1. New conversation
      2. Younes Ouhbi‏ @younesouhbi 27 May 2019
        Replying to @TimSweeneyEpic

        What's wrong with "int x" ? looks good to me as it mimics math a little.

        1 reply 0 retweets 1 like
      3. Tim Sweeney‏ @TimSweeneyEpic 27 May 2019
        Replying to @younesouhbi

        "int x" seems benign, but it runs aground when we expand the type system. Is "int<a,b>x" one declaration or two inequalities? Do we extend the patterns with functions? "int f(int)" seems nice, but what about "int(int)(int(int))f(int(int)(int(int)))"?

        5 replies 0 retweets 5 likes
      4. Show replies
      1. New conversation
      2. Brigham‏ @applebiscuit 27 May 2019
        Replying to @TimSweeneyEpic

        What do you think of local variable type inference (val/var) in Java 10 and Lombok? Are you against type declaration or just that int is used to represent two different things?

        1 reply 0 retweets 0 likes
      3. Tim Sweeney‏ @TimSweeneyEpic 27 May 2019
        Replying to @applebiscuit

        Strongly-typed, dynamically-typed, and gradually-typed languages all have important roles in the ecosystem. I'm advocating for context-free syntax, meaning that an expression's semantic meaning is independent of where it occurs (except due to name scoping).

        1 reply 0 retweets 4 likes
      4. Show replies
      1. Styg  🦀‏ @StygianDev 27 May 2019
        Replying to @TimSweeneyEpic

        laughs in @rustlang

        0 replies 0 retweets 0 likes
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