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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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    Tim Sweeney‏ @TimSweeneyEpic Jan 2
    • Report Tweet
    • Report NetzDG Violation

    Key tools for C++ container library performance are guaranteed copy elision and guaranteed return value optimization. One trick for library writers (which needn't complicate life for library users) is:pic.twitter.com/WFtJx7TGBe

    8:47 PM - 2 Jan 2020
    • 22 Retweets
    • 221 Likes
    • 🌴🔥Mavreon Studios🔥🌴 flyper Alex Demets Myron L Stewart (マイロン スチュワート) Heber Roger Poon Joshua Sarfaty Tomek Wiercioch Jeff Greenback
    17 replies 22 retweets 221 likes
      1. Tim Sweeney‏ @TimSweeneyEpic Jan 2
        • Report Tweet
        • Report NetzDG Violation

        Would be nice to just have this_return_value as a first-class construct in functions, as Pascal has supported all along.

        5 replies 0 retweets 45 likes
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      2. Daroou2 (amaiorano)‏ @antoniomaiorano Jan 2
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        Replying to @TimSweeneyEpic

        Not bad, though you have to add that constructor to every type you want to init this way. C++17 has guaranteed copy elision, so this trick isn't really needed anymore.

        1 reply 0 retweets 0 likes
      3. Tim Sweeney‏ @TimSweeneyEpic Jan 2
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        Replying to @antoniomaiorano

        Let's say you want to construct an optional<tuple<ts...>> from a tuple<us...>, performing some sort of conversion and test on each element, with the optional's has_value true only if all tests succeed. How would you do this without exceptions or extra copies?

        1 reply 0 retweets 3 likes
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      2. Chris Varnz‏ @chrisvarnz Jan 3
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        Replying to @TimSweeneyEpic

        What exactly is the problem youre trying to solve here? You want the address of the object in the calling stack frame i.e. the final destination after copy elision / RVO? I'm not seeing how elision/RVO is guaranteed to happen

        1 reply 0 retweets 1 like
      3. Tim Sweeney‏ @TimSweeneyEpic Jan 3
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        Replying to @chrisvarnz

        Aim: testing and transforming data on arbitrary nested data structures in a single pass, generating results once in-place, without throwing exceptions.

        0 replies 0 retweets 3 likes
      4. End of conversation
      1. New conversation
      2. João Marinheiro‏ @joaomarinheiro Jan 3
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        Replying to @TimSweeneyEpic

        Is the return statement in the constructor supposed to be there? I thought it wasn't valid in C++ to return a value in a constructor.

        1 reply 0 retweets 1 like
      3. Tim Sweeney‏ @TimSweeneyEpic Jan 3
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        • Report NetzDG Violation
        Replying to @joaomarinheiro

        You’re right. “return lambda(this);” should be “lambda(this);”

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. Jeroen Baert‏Verified account @jbaert Jan 2
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        Replying to @TimSweeneyEpic

        *cries into a Stroustroup book*

        0 replies 0 retweets 11 likes
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      2. adjoint +/- norm  🦀‏ @adamnemecek1 Jan 2
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        Replying to @TimSweeneyEpic

        Rewrite it in rust.

        3 replies 0 retweets 5 likes
      3. CJ‏ @CHRlSJ0NES Jan 2
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        Replying to @adamnemecek1 @TimSweeneyEpic

        brb *looks for Michael Jackson eating popcorn meme*

        0 replies 0 retweets 2 likes
      4. End of conversation

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