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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. Dale Wijnand‏ @dwijnand 3 Mar 2019
      Replying to @propensive

      There's a few dodgy asInstanceOf's and uncheckedVariance's but, on the other hand, there's surprising little code!

      2 replies 0 retweets 1 like
    2. Jon Pretty‏ @propensive 3 Mar 2019
      Replying to @dwijnand

      Yeah, `cloc` says 45 LoC. I'm collating the values in an untyped Map, so the casts are necessary. As for the unchecked variance, it's on a phantom type. Excuses, excuses...

      1 reply 0 retweets 0 likes
    3. Dale Wijnand‏ @dwijnand 3 Mar 2019
      Replying to @propensive

      Doesn't look phantom to me...

      1 reply 0 retweets 0 likes
    4. Jon Pretty‏ @propensive 3 Mar 2019
      Replying to @dwijnand

      Oh yeah... caught in the lie! ;) But I meant that the `T` is inferred from the instance `field`, and that `T`, LUBed with other `T`s, helps to infer a phantom type, while the instance `field` is quickly raised to a `BaseKey`... and everything is fine because of erasure...

      1 reply 0 retweets 0 likes
    5. Dale Wijnand‏ @dwijnand 3 Mar 2019
      Replying to @propensive

      Clever or too clever? Also, could it be made more obviously correct?

      1 reply 0 retweets 0 likes
    6. Jon Pretty‏ @propensive 3 Mar 2019
      Replying to @dwijnand

      Not sure. I've been playing around with inferring types through variance for a while. I don't like the use of implicits, especially. And maybe use-site variance (i.e. bounded existentials) might work better...

      1 reply 0 retweets 0 likes
    7. Jon Pretty‏ @propensive 3 Mar 2019
      Replying to @propensive @dwijnand

      Alternatively, given(a, b, c).propagate(d) { ... } could be replaced with (a & b & c).propagate(d) { ... } without the @ uv or implicits. WDYT?

      1 reply 0 retweets 0 likes
    8. Dale Wijnand‏ @dwijnand 3 Mar 2019
      Replying to @propensive

      That's symbolic, so also not good. Maybe I'll get a chance to play with it today.

      1 reply 0 retweets 1 like
    9. Jon Pretty‏ @propensive 3 Mar 2019
      Replying to @dwijnand

      Fair warning: you'll need to compile Mercator first, which Pyroclastic depends on. I also discovered that dotc does not infer implicit function types the same as if they're explicit lambdas at the callsite, which is problematic. Best to use scalac until I work that out.

      1 reply 0 retweets 0 likes
    10. Dale Wijnand‏ @dwijnand 3 Mar 2019
      Replying to @propensive

      Is https://search.maven.org/artifact/com.propensive/mercator_2.12/0.1.1/jar … not good enough?

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 4 Mar 2019
      Replying to @dwijnand

      Probably not. I don't think that version defines sequence for monads...

      12:02 AM - 4 Mar 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Jon Pretty‏ @propensive 4 Mar 2019
          Replying to @propensive @dwijnand

          The thing about my experimental libraries is that you've got to really want to experiment... ;)

          1 reply 0 retweets 0 likes
        2. Dale Wijnand‏ @dwijnand 4 Mar 2019
          Replying to @propensive

          I'll take a fury build definition and access to a fury beta build, if available.

          1 reply 0 retweets 1 like
        3. Show replies

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