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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. Tim Sweeney‏ @TimSweeneyEpic Jan 4
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      There are two interesting extremes of platform independent programming language design. One maps to hardware operations without surprising overhead, and another maximizes code correctness and verifiability by obeying all expected mathematical and set theoretic properties.

      13 replies 12 retweets 174 likes
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    2. Tim Sweeney‏ @TimSweeneyEpic Jan 4
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      The first one is the C++ language. Disregard the byzantine standard libraries, syntax, and overload resolution rules, and it’s just a typed macro assembler.

      4 replies 3 retweets 53 likes
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    3. Tim Sweeney‏ @TimSweeneyEpic Jan 4
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      The second one doesn’t really exist though CoQ and AGDA go in that direction. They support proofs-as-programs but aren’t quite real programming languages and have weird properties like rational numbers not being a subtype of integers.

      8 replies 1 retweet 41 likes
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      Tim Sweeney‏ @TimSweeneyEpic Jan 4
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      Generally, I think the high level language could be layered onto the low level one through expanded libraries and constraints on unsafe operations, making a nice interoperable stack from top to bottom, with a unified and much more regular syntax than the status quo.

      10:48 PM - 4 Jan 2020
      • 2 Retweets
      • 66 Likes
      • Stephan Tolksdorf Geert Depuydt Harrison Hartley / Grey Ghost Samuel Kahn Chris_Rock Konstantin Bob Burrough Syama Mishra MTL Thatchbak
      15 replies 2 retweets 66 likes
        1. New conversation
        2. Lambda Duck‏ @Anka213 Jan 5
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          Replying to @TimSweeneyEpic

          So, how well do you think Rust fares here?

          1 reply 0 retweets 0 likes
        3. Tim Sweeney‏ @TimSweeneyEpic Jan 5
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          Replying to @Anka213

          Rust is C++ minus powerful template abstraction features plus stronger safety guarantees through shifting proofs of liveness to the programmer. Kind of one step backward and one step forward, not any closer to ideal.

          1 reply 0 retweets 3 likes
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        2. W. Brian Gourlie‏ @dubya_brian Jan 4
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          Replying to @TimSweeneyEpic

          What’s considered “unsafe” here? It seems like the lower level could trivially violate invariants required in the higher level, which would result in UB in the higher level.

          1 reply 0 retweets 0 likes
        3. Tim Sweeney‏ @TimSweeneyEpic Jan 4
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          Replying to @dubya_brian

          Lower level code would be for performance critical systems that is assumed to be correct but isn’t proven to be so. This approach enables incremental adoption. We can start with a working but unproven system and prove more of it correct over time.

          1 reply 0 retweets 1 like
        4. 2 more replies
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        2. Jonathan Blow‏ @Jonathan_Blow Jan 5
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          Replying to @TimSweeneyEpic

          This is the thing that people need to understand. People have come to conflate “high level” with “in a separate universe from concerns with the CPU”... but the right idea is to connect from the high level all the way to the lowest level, and you adjust level as needed.

          3 replies 4 retweets 50 likes
        3. Raph Levien‏ @raphlinus Jan 5
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          Replying to @Jonathan_Blow @TimSweeneyEpic

          Rust is the closest thing we have to that today. For example, signed wrapping arithmetic operations exist in the CPU but were effectively removed from C/C++. But they exist in Rust (if a bit verbosely).

          1 reply 0 retweets 8 likes
        4. 2 more replies
        1. Bart‏ @batomaru Jan 5
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          Replying to @TimSweeneyEpic

          To me you just described Rust: I have high level abstractions, algebraic data types, etc., but I can implement a memory allocator or talk to C library at the same time.

          0 replies 0 retweets 2 likes
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        1. Stalwart Sweeper Stan‏ @Lilgamer9000 Jan 4
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          Replying to @TimSweeneyEpic

          Tim I cant take all this in. I'm not a very smart person

          0 replies 0 retweets 1 like
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        1. Azzult‏ @AzzultYT Jan 4
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          Replying to @TimSweeneyEpic

          Ok but does Fortnite use a different code language

          0 replies 0 retweets 0 likes
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        1. playerg‏ @Epicplayer77 Jan 4
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          Replying to @TimSweeneyEpic

          A chief suggestion regarding the current state of Fortnite: Separate the PC players from the console players as this increased very strongly in the level of fights and is causing abandonment of the game. It would be a start to recover public in the game.

          0 replies 0 retweets 0 likes
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