#racket on 2021-02-12 — irc logs at freenode.irclog.whitequark.org

2021-01-03 04:01 samth changed the topic of #racket to: Racket v7.9 has been released: https://blog.racket-lang.org/2020/11/racket-v7-9.html -- Racket -- https://racket-lang.org -- https://pkgs.racket-lang.org -- Paste at http://pasterack.org

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10:08 <yurb> I have another question about generics. Let's say I want to use it to enable (de)serialization of structs to json. Serialization is straightforward - I define a generic method like to-json that I can call on instances of structs; I'm puzzled by deserialization though - where do I put the (per-type) from-json methods if the instance does not exist prior to deserialization?

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11:37 <dzoe> yurb: dunno what is the "best" way to do it, but generally I'd just stick with some syntax-stage-time registry being populated by some struct form wrapper

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12:27 <yurb> dzoe: I see; currently experimenting with a runtime registry without generics for both serialization and deserialization.

12:30 <yurb> Another question :) In a macro I have two pattern variables of unequal length. Is there a way to say in a syntax template to stop expanding ... as soon as the shortest one is exhausted?

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18:15 <friscosam> yurb: yes you can. How you do it can depend on which macro parser you use. Here's one way to do it in syntax-rules. https://gist.github.com/samdphillips/265e4fb580e1c075753a8a833d9745d1

18:16 <friscosam> I imagine there are slightly clearer ways of doing it in syntax-case and syntax-parse

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18:27 <yurb> friscosam: thank you! I use syntax-parse, but it's good to know this can be done in multiple ways.

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