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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 22 Dec 2019

      Jon Pretty Retweeted Jon Pretty

      To elaborate on this a little: the implicit TheInternet has no methods, no capabilities, and does nothing. But requiring it as an implicit forces awareness across the call stack and in every method signature of the need for network connectivity.https://twitter.com/propensive/status/1208452152563290112 …

      Jon Pretty added,

      Jon Pretty @propensive
      I'm going to define an empty object called `TheInternet` and demand it as an implicit parameter to every method that needs to access the Internet, in order to make it harder to "accidentally" do things in Fury which need an Internet connection.
      2 replies 0 retweets 10 likes
    2. Erik Schnetter‏ @eschnett 22 Dec 2019
      Replying to @propensive

      And most importantly, there is no public constructor that people can use to cheat.

      1 reply 0 retweets 1 like
    3. P. Oscar Boykin‏ @posco 22 Dec 2019
      Replying to @eschnett @propensive

      People can cheat. It isn’t used you can cast null into the value, use reflection or write a method to steal the Internet when you have it and supply it others later (by modifying a mutable store). This kind of thing can give guidance but it is impossible in scala to lock it down.

      1 reply 0 retweets 3 likes
    4. Jon Pretty‏ @propensive 22 Dec 2019
      Replying to @posco @eschnett

      Yes, totally. It would require wilful circumvention, but it's not beyond most people's capabilities.

      1 reply 0 retweets 0 likes
    5. Arnold deVos‏ @a4dev 23 Dec 2019
      Replying to @propensive @posco @eschnett

      And you can make it _erased_ in dotty which prevents storing TheInternet in a data structure for later, another kind of cheat less willful than casting null.

      1 reply 0 retweets 1 like
    6. P. Oscar Boykin‏ @posco 23 Dec 2019
      Replying to @a4dev @propensive @eschnett

      This is nice. I hadn’t considered this.

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 23 Dec 2019
      Replying to @posco @a4dev @eschnett

      Unfortunately erased got erased from Scala 3 by the SIP process (though, to my knowledge it's still in the compiler). So we're going to have to store it on-heap.

      3:42 PM - 23 Dec 2019
      • 1 Like
      • Rüdiger Klaehn
      3 replies 0 retweets 1 like
        1. Arnold deVos‏ @a4dev 23 Dec 2019
          Replying to @propensive @posco @eschnett

          Bugger. I didn't know that.

          0 replies 0 retweets 2 likes
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        1. le Chep‏ @c_chep 23 Dec 2019
          Replying to @propensive @posco and

          Oh no!

          0 replies 0 retweets 1 like
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        1. New conversation
        2. P. Oscar Boykin‏ @posco 23 Dec 2019
          Replying to @propensive @a4dev @eschnett

          That’s a bummer. Any summary as to why?

          1 reply 0 retweets 1 like
        3. Arnold deVos‏ @a4dev 23 Dec 2019
          Replying to @posco @propensive @eschnett

          I found this: https://docs.scala-lang.org/sips/minutes/2019-06-08-sip-minutes.html … Too bad but I guess it needs to be proven useful vs. 'seems' useful.

          0 replies 0 retweets 1 like
        4. End of conversation

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