#commonlisp on 2025-04-21 — irc logs at libera.catirclogs.org

2022-07-28 16:55 jackdaniel changed the topic of #commonlisp to: Common Lisp, the #1=(programmable . #1#) programming language | Wiki: <https://www.cliki.net> | IRC Logs: <https://irclog.tymoon.eu/libera/%23commonlisp> | Cookbook: <https://lispcookbook.github.io/cl-cookbook> | Pastebin: <https://plaster.tymoon.eu/>

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05:13 <Josh_2> hi

05:14 <beach> Josh_2: What's up?

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06:59 <beach> I added Inravina and Constrictor to: http://metamodular.com/SICL-related-libraries/sicl-related-libraries.html so now there are only a bit more than 20 entries to add.

06:59 <ixelp> SICL-related libraries

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14:13 <Josh_2> beach: there is an empty bullet point in Anatomicl

14:14 <Josh_2> Can you include links to the source in the entries?

14:34 <beach> Josh_2: Thanks. I'll have a look. Well, I want to avoid links to the source because of the migration to s-expressionists. Everything should be in one of the two locations I listed in the beginning.

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14:36 <beach> Empty bullet fixed. Thanks again.

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22:54 <trannus_aran> So do folks use structs for much, or do you all handle polymorphism with CLOS generics? I've heard there's a performance hit with CLOS potentially, but idk how true that is (or if other systems of message or callback passing are more ergonomic in some cases)

22:56 <TMA> trannus_aran: as always: it depends on your exact usecase

23:00 <TMA> in my personal programming style I don't use polymorphism all that much. I am not actually avoiding it, but it mainly solves problems I tend not to have, like some dynamic runtime configuration

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23:56 <aeth> The rule of thumb is that if you have typed slots, then a struct may make sense. It's especially for performance, especially in SBCL, if those slots are arrays and/or numeric... because e.g. a slot of (simple-array single-float (3)) will let the compiler know the bounds (removes checks) and the type of the AREF (removes generic +, etc.) on accessor call (although defining a generic won't really help the

23:56 <aeth> compiler because that's extra layers of indirection)

23:58 <aeth> So if you have a lot of arrays of single-floats and/or double-floats (etc.) and you run them in a loop? Structs can (it depends on the implementation) preserve the type information so you won't have to have DECLAREs (or THEs, etc.) and (re)checking everywhere because the implementation knows what types the reader function must return.

23:59 <aeth> If this doesn't sound like your program, you're probably not missing much in performance.