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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 Feb 12

      Jon Pretty Retweeted Jon Pretty

      Here is the full Scala 3 macro for @skaalf's string unpacking challenge, in one tweet!https://twitter.com/propensive/status/1359923735843790855 …

      Jon Pretty added,

      Jon Pretty @propensive
      Replying to @propensive @skaalf
      The whole thing: import scala.quoted._ inline def unpack[T <: String & Singleton]: List[Char] = ${unpack[T]} def unpack[T <: String & Singleton: Type](using Quotes) = import quotes.reflect._ TypeRepr.of[T] match case ConstantType(StringConstant(s)) => Expr(s.toList)
      1 reply 0 retweets 5 likes
    2. Julien Tournay‏ @skaalf Feb 12
      Replying to @propensive

      No there's a bit more to it actually :)https://gist.github.com/jto/8f37c1c6d7ef253b937937deb9f1ba6a …

      1 reply 0 retweets 2 likes
    3. Jon Pretty‏ @propensive Feb 12
      Replying to @skaalf

      Ah, I see you're returning the singleton-literal-typed tuple, and not just a boring old List[Char]!

      1 reply 0 retweets 0 likes
    4. Julien Tournay‏ @skaalf Feb 12
      Replying to @propensive

      It was the main difficulty indeed 😊

      1 reply 0 retweets 1 like
      Jon Pretty‏ @propensive Feb 12
      Replying to @skaalf

      Is this, TypeRepr.of(using ConstantType(CharConstant(c)).asType) not the same as, ConstantType(CharConstant(c)) ?

      7:00 AM - 12 Feb 2021
      2 replies 0 retweets 0 likes
        1. Julien Tournay‏ @skaalf Feb 12
          Replying to @propensive

          Apparently not. ConstantType does not extend type

          0 replies 0 retweets 0 likes
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        1. Julien Tournay‏ @skaalf Feb 12
          Replying to @propensive

          Oh wait. Yes it works :) Good catch!

          0 replies 0 retweets 1 like
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