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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

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propensive.com
Joined July 2010

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    1. Jon Pretty‏ @propensive 16 Jun 2019

      I had a go at modifying the Scala 3 type system to support inline arithmetic in singleton literals. The compiler will now typecheck this: import compiletime._ the[(2 + 2)*2 =:= 5 + 3] https://github.com/propensive/dotty/tree/typelevel-singleton-literal-type-arithmetic …

      4 replies 11 retweets 75 likes
      Show this thread
    2. Jakub Kozłowski‏ @kubukoz 16 Jun 2019
      Replying to @propensive

      awesome stuff, imagine if we could get the size of a List and add these safely...

      1 reply 0 retweets 3 likes
    3. Jon Pretty‏ @propensive 16 Jun 2019
      Replying to @kubukoz

      That's pretty easy to do. I'll post my (propensive/dotty-only) code sample of dimension-checked matrices tomorrow.

      1 reply 0 retweets 4 likes
    4. Jon Pretty‏ @propensive 16 Jun 2019
      Replying to @propensive @kubukoz

      The huge challenge, I think, is going to be dealing with interactions between lists of statically-known and statically-unknown length.

      2 replies 0 retweets 4 likes
    5. Jakub Kozłowski‏ @kubukoz 16 Jun 2019
      Replying to @propensive

      Yeah, having to encode associativity/commutativity of addition and multiplication in the compiler to ensure (a.size + 5) =:= (5 + a.size)...

      1 reply 0 retweets 0 likes
    6. Jakub Kozłowski‏ @kubukoz 16 Jun 2019
      Replying to @kubukoz @propensive

      At least I guess that's what it would take

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 16 Jun 2019
      Replying to @kubukoz

      I think that that part of it isn't the worst...

      7:43 AM - 16 Jun 2019
      • 1 Like
      • Jakub Kozłowski
      0 replies 0 retweets 1 like

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