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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 29 Sep 2019
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      Look at your favorite programming language and identify the little functional logic languages embedded in it (meaning: backtracking evaluation with unification to find unknowns). JavaScript, C#, and Java have one for regular expressions.

      18 replies 10 retweets 115 likes
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    2. Tim Sweeney‏ @TimSweeneyEpic 29 Sep 2019
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      C++ has one for template parameter instantiation and overload resolution. Haskell has one for typeclass search, another for pattern matching and binding expressions, and a third with monads.

      3 replies 3 retweets 35 likes
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      Tim Sweeney‏ @TimSweeneyEpic 29 Sep 2019
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      At some point, we should take this realization seriously and start building backtracking, failure and unification into languages as first class constructs, to replace the funky sublanguages with a general language feature.

      4:20 PM - 29 Sep 2019
      • 6 Retweets
      • 66 Likes
      • 🌴🔥Mavreon Studios🔥🌴 Suhas Pai Mark Thom Aziem Chawdhary Daniel Bergey Shaeh yaboi Kyle Pfeiffer Gregorio Olarte
      7 replies 6 retweets 66 likes
        1. Tim Sweeney‏ @TimSweeneyEpic 29 Sep 2019
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          Fortunately, most languages already have the low-level plumbing mechanisms to implement functional logic: futures (variables that can be unified), coroutines (for separating value production from consumption), and exceptions (for failing back to a join.)

          7 replies 1 retweet 30 likes
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        2. Wouter‏ @wvo 29 Sep 2019
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          Replying to @TimSweeneyEpic

          The Icon programming language is worth revisiting, as it was able to do (cross function) backtracking in an imperative setting, allowing some very terse control structures. I implemented it once, can be pretty fast too, see https://dl.acm.org/citation.cfm?id=914441 … (sorry no non-acm link)

          2 replies 0 retweets 6 likes
        3. Tim Sweeney‏ @TimSweeneyEpic 29 Sep 2019
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          Replying to @wvo

          That's nice! Using declarative backtracking and choice to consume and produce containers is super expressive.

          1 reply 0 retweets 4 likes
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        2. Lyth‏ @kriolyth 29 Sep 2019
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          Replying to @TimSweeneyEpic

          Prolog is actually the language built on unification and backtracking, but it is hard to tell whether it makes more sense to use it as a sub-language or on its own.

          1 reply 1 retweet 2 likes
        3. Tim Sweeney‏ @TimSweeneyEpic 29 Sep 2019
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          Replying to @kriolyth

          Mercury and Curry are functional logic languages which are a lot closer to normal programming practice. If you know how to map Haskell to the C family, then you'll find these pretty straightforward.

          1 reply 0 retweets 4 likes
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        1. Patrick Walton‏ @pcwalton 29 Sep 2019
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          Replying to @TimSweeneyEpic

          Check out Rust’s Chalk: https://github.com/rust-lang/chalk  Long-term goal is to replace the type checker with a Prolog-like interpreter, and package Chalk independently for others to use as well.

          0 replies 2 retweets 12 likes
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        2. Barry Kelly‏ @barrkel 29 Sep 2019
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          Replying to @TimSweeneyEpic

          Oz / Mozart has this, per CTMCP, which is where I learned it (although I guess I could have learned it from Prolog). Honestly, it seems mostly useful for programming competitions problems (so much bounded combinatoric search!) and Sudoku solvers.

          1 reply 0 retweets 1 like
        3. Barry Kelly‏ @barrkel 29 Sep 2019
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          Replying to @barrkel @TimSweeneyEpic

          General computation over types / generics is actually a distinct language direction, and I personally don't think it's a fruitful avenue. It makes tooling really hard, tends towards macros in creating inscrutable write-only libraries, and generally harms scaling up a team.

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. Stilgar‏ @Eirenarch 30 Sep 2019
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          Replying to @TimSweeneyEpic

          What part of this requires a language feature? Many people already prefer to write regex with a library with a builder pattern instead of writing the string so what's wrong with the library approach to the problem?

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        1. Michael James‏ @MichaelJamesNCA 29 Sep 2019
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          Replying to @TimSweeneyEpic

          I’ve always wondered when you’re going to retire to a professorship lecturing on the principles and concepts of programming languages. Those leather elbow patch sweaters would suit you well

          0 replies 0 retweets 0 likes
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