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2021-04-28 12:21:09 × ech quits (~user@gateway/tor-sasl/ech) (Ping timeout: 240 seconds)
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2021-04-28 12:40:46 → hpc joins (~juzz@ip98-169-35-13.dc.dc.cox.net)
2021-04-28 12:41:02 <thblt> I have a (finite) bunch of objects that link to each other (let's say books and their authors). Is it reasonable/idiomatic to store the objects in some sort of indexed container (eg `Map Int Object`) and have those links represented as indexes? Eg newtype ObjectId = Int; data Book = Book { author :: ObjectId, title :: String}? (The actual model is more complex, I would just like to know if it makes sense)
2021-04-28 12:41:25 <merijn> "maybe"?
2021-04-28 12:41:30 <thblt> Ha.
2021-04-28 12:41:43 <thblt> :)
2021-04-28 12:43:54 × ddellacosta quits (ddellacost@gateway/vpn/mullvad/ddellacosta) (Ping timeout: 260 seconds)
2021-04-28 12:43:57 carbolymer just found memleak
2021-04-28 12:44:23 <carbolymer> Someone used mapConcurrently spawning a gazillion of threads :/
2021-04-28 12:44:37 × cfricke quits (~cfricke@unaffiliated/cfricke) (Quit: WeeChat 3.1)
2021-04-28 12:44:40 <merijn> carbolymer: Yes, mapConcurrently doesn't do any limiting
2021-04-28 12:44:56 <merijn> That's why I wrote my own version(s) :p
2021-04-28 12:45:05 <carbolymer> Any ideas how can I limit nr of concurrent threads?
2021-04-28 12:45:26 <carbolymer> merijn: nice, is it open-source?;)
2021-04-28 12:46:14 <merijn> carbolymer: Yes, which is another way of saying "It doesn't support 9.0 or 9.2 yet, because I don't have time to update all my packages until, like, June :p)
2021-04-28 12:46:18 <merijn> carbolymer: https://hackage.haskell.org/package/broadcast-chan-0.2.1.1/docs/BroadcastChan.html#g:4
2021-04-28 12:46:27 <carbolymer> Thx!
2021-04-28 12:46:45 <merijn> carbolymer: Got a conduit version too: https://hackage.haskell.org/package/broadcast-chan-conduit-0.2.1.1/docs/BroadcastChan-Conduit.html
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2021-04-28 12:58:30 <tomsmeding> thblt: you're losing type safety that way, since you're mapping to a generic Object, not a Book or an Author specifically. Whether that's okay depends on your application :)
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2021-04-28 12:58:54 <tomsmeding> If that's okay, I think it's a fine way of making a very flexible data structure for this purpose
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2021-04-28 13:02:16 <thblt> tomsmeding: Thanks. I was planning of using phantom types to mitigate the first issue.
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2021-04-28 13:13:23 × stree quits (~stree@68.36.8.116) (Ping timeout: 265 seconds)
2021-04-28 13:14:16 <haasn> There's a name for the concept of abstractions like `data Widget = Widget { doSomething :: Bool -> Widget, doSomethingElse :: Int -> Widget }`, as opposed to e.g. `class Widget w where doSomething :: w -> Bool -> w; doSomethingElse :: w -> Int -> w`
2021-04-28 13:14:20 <haasn> What is the name for this first type of design?
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2021-04-28 13:28:58 <sshine> haasn, good question.
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2021-04-28 13:30:14 <sshine> haasn, I think that could depend on how you deal with w. but one very general term would be type-parameterised?
2021-04-28 13:30:30 <merijn> haasn: I usually call it "OO Haskell" :p
2021-04-28 13:31:13 <merijn> Because it basically behaves like OO interfaces
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2021-04-28 13:33:34 <sshine> haasn, if you have something like 'data Widget w = Widget { doSomething :: w Bool, doSomethingElse :: Int -> w () }', you'd have a Barbie. :-D http://hackage.haskell.org/package/barbies -- i.e., if your type parameter is specifically a unary type-constructor.
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