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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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Joined July 2010

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    1. Alex Nedelcu‏ @alexelcu 12 Sep 2019

      I finally found a thing that I don't like about #Scala 😭 — the following code fails with "cannot override final member": https://scalafiddle.io/sf/lpr96Q0/2 pic.twitter.com/KBG7BT0nUD

      3 replies 0 retweets 10 likes
      Show this thread
    2. Alex Nedelcu‏ @alexelcu 12 Sep 2019

      You might say that it's normal due to "linearization order". But it's not, this makes no sense b/c I want my traits to provide "default" implementations only in case those methods are not implemented yet and I want my "abstract class" too. Java 8 works just fine:pic.twitter.com/SPtXsDbvrd

      2 replies 0 retweets 1 like
      Show this thread
    3. Paolo G. Giarrusso‏ @Blaisorblade 13 Sep 2019
      Replying to @alexelcu

      Might be worth a pre-SIP, then Dotty proposal for an enhancement... But can you explain why you want traits to only provide defaults, other than "Java does it"? I've certainly written traits overriding class behavior. And "change inheritance order" seems correct.

      2 replies 0 retweets 0 likes
    4. Alex Nedelcu‏ @alexelcu 13 Sep 2019
      Replying to @Blaisorblade

      You can't change inheritance order when the implementation you want is in an "abstract class". And default methods are relevant for type class definitions, where the implementation is provided based on abstract methods, but that you can override for performance reasons.

      1 reply 0 retweets 1 like
    5. Paolo G. Giarrusso‏ @Blaisorblade 13 Sep 2019
      Replying to @alexelcu

      I get that much of the typeclass scenario. But traits are more general, this semantics more expressive than Java’s, and your fix (“move final methods out of abstract classes”) seems to work.

      1 reply 0 retweets 0 likes
    6. Alex Nedelcu‏ @alexelcu 13 Sep 2019
      Replying to @Blaisorblade

      Would be nice to have an annotation that makes traits behave exactly like Java interfaces.

      3 replies 1 retweet 2 likes
      Jon Pretty‏ @propensive 13 Sep 2019
      Replying to @alexelcu @Blaisorblade

      Ancient Scala trivia: Scala used to have an `interface` keyword for defining Java interfaces which weren't allowed to have implementations.

      3:20 AM - 13 Sep 2019
      • 6 Likes
      • Łukasz Biały Олег Пыжков Mateusz Kubuszok 👾 Jakub Kozłowski Paolo G. Giarrusso
      0 replies 0 retweets 6 likes

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