| 2024-11-15 00:03:51 +0100 | <jackdk> | carbolymer: I don't understand your suggestion. The typeclass I want to type-family-ify exists and I cannot change it (concrete example: `GHC.Records.HasField`), but I want a type family that can select the field type. This example fails with "The RHS of an associated type declaration mentions out-of-scope variable ‘z’ All such variables must be bound on the LHS" https://www.irccloud.com/pastebin/4aygJmq9/MakeATypeFamily.hs |
| 2024-11-15 00:06:26 +0100 | rvalue- | (~rvalue@user/rvalue) rvalue |
| 2024-11-15 00:07:19 +0100 | rvalue | (~rvalue@user/rvalue) (Ping timeout: 260 seconds) |
| 2024-11-15 00:10:34 +0100 | rvalue- | rvalue |
| 2024-11-15 00:19:05 +0100 | <carbolymer> | jackdk: ah, you can't modify the original class - that' s though |
| 2024-11-15 00:20:06 +0100 | <carbolymer> | s/though/tough |
| 2024-11-15 00:24:54 +0100 | nek0 | (~nek0@user/nek0) (Quit: The Lounge - https://thelounge.chat) |
| 2024-11-15 00:26:44 +0100 | <carbolymer> | jackdk: maybe something in this direction https://paste.tomsmeding.com/Og2LnIpN ? |
| 2024-11-15 00:29:03 +0100 | <jackdk> | The problem is I didn't know `a` at the time. (I was trying to write some servant-flavoured stuff, and wanted to provide an analogue to `ToServantApi` that extracted a single field). So I don't actually know the final type (because there are other TFs involved) but I know GHC does |
| 2024-11-15 00:30:01 +0100 | aljazmc | (~aljazmc@user/aljazmc) (Remote host closed the connection) |
| 2024-11-15 00:30:32 +0100 | <carbolymer> | ah |
| 2024-11-15 00:31:05 +0100 | ljdarj1 | (~Thunderbi@user/ljdarj) ljdarj |
| 2024-11-15 00:34:10 +0100 | ljdarj | (~Thunderbi@user/ljdarj) (Ping timeout: 244 seconds) |
| 2024-11-15 00:34:10 +0100 | ljdarj1 | ljdarj |
| 2024-11-15 00:41:13 +0100 | acidjnk | (~acidjnk@p200300d6e7283f73687bc11ede7922f8.dip0.t-ipconnect.de) (Ping timeout: 245 seconds) |
| 2024-11-15 00:45:54 +0100 | jle` | (~jle`@2603:8001:3b02:84d4:71c9:147c:d31f:c8d0) (Ping timeout: 246 seconds) |
| 2024-11-15 00:47:05 +0100 | jle` | (~jle`@2603:8001:3b02:84d4:4ba:cd34:52ca:7a5) jle` |
| 2024-11-15 00:48:36 +0100 | <sm> | @where+ wiwik https://gotchamana.github.io/wiwinwlh What I Wish I Knew When Learning Haskell, Stephen Diehl |
| 2024-11-15 00:48:37 +0100 | <lambdabot> | Good to know. |
| 2024-11-15 00:48:39 +0100 | <sm> | found! |
| 2024-11-15 00:49:10 +0100 | arthurvl | (~arthurvl@77-174-49-144.fixed.kpn.net) earthy |
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| 2024-11-15 02:44:40 +0100 | m5zs7k | (aquares@web10.mydevil.net) (Quit: m5zs7k) |
| 2024-11-15 02:45:04 +0100 | m5zs7k | (aquares@web10.mydevil.net) m5zs7k |
| 2024-11-15 02:47:08 +0100 | <zero> | funny how haskell classes inherit the same problem as oop inheritence |
| 2024-11-15 02:47:27 +0100 | <zero> | pun intended i guess |
| 2024-11-15 02:51:19 +0100 | <Axman6> | Multiple (problem) inheritance |
| 2024-11-15 02:52:48 +0100 | <monochrom> | What is the problem? |
| 2024-11-15 02:59:15 +0100 | Tuplanolla | (~Tuplanoll@91-159-69-59.elisa-laajakaista.fi) (Quit: Leaving.) |
| 2024-11-15 03:06:43 +0100 | gmg | (~user@user/gehmehgeh) (Remote host closed the connection) |
| 2024-11-15 03:08:22 +0100 | gmg | (~user@user/gehmehgeh) gehmehgeh |
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| 2024-11-15 03:19:08 +0100 | <Axman6> | it makes sorting out the will much more difficult |
| 2024-11-15 03:19:27 +0100 | <monochrom> | haha |
| 2024-11-15 03:25:46 +0100 | Square | (~Square@user/square) Square |
| 2024-11-15 03:29:14 +0100 | <EvanR> | one problem with oop inheritance, usually, is joe schmoe want's his class to inherit from multiple other classes simultaneously. It's a problem either because you aren't allowed to do it, or because you are allowed to do it (e.g. in python) |
| 2024-11-15 03:29:24 +0100 | <EvanR> | not sure how that translates to haskell |
| 2024-11-15 03:29:37 +0100 | jjhoo | (~jahakala@user/jjhoo) (Ping timeout: 248 seconds) |
| 2024-11-15 03:36:00 +0100 | talismanick | (~user@2601:644:937c:ed10::ae5) talismanick |
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| 2024-11-15 03:41:38 +0100 | jjhoo | (~jahakala@user/jjhoo) jjhoo |
| 2024-11-15 04:03:39 +0100 | shapr | (~user@2601:19c:417e:5434:b5b7:a31:f560:51b7) (Quit: sleep) |
| 2024-11-15 04:04:11 +0100 | <sm> | I guess: long chains of dependency make the whole system more brittle ? |
| 2024-11-15 04:05:02 +0100 | <sm> | I don't know about multiple inheritance either but suspect that's the root problem |
| 2024-11-15 04:07:12 +0100 | yisef | (~yisef@122.10.198.17) |
| 2024-11-15 04:07:15 +0100 | <sm> | https://en.wikipedia.org/wiki/Multiple_inheritance#The_diamond_problem |
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| 2024-11-15 04:18:51 +0100 | Katarushisu6 | (~Katarushi@finc-20-b2-v4wan-169598-cust1799.vm7.cable.virginm.net) Katarushisu |
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| 2024-11-15 04:21:07 +0100 | Katarushisu6 | Katarushisu |
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| 2024-11-15 04:39:12 +0100 | pavonia | (~user@user/siracusa) (Quit: Bye!) |
| 2024-11-15 04:48:11 +0100 | <EvanR> | in "type classes vs the world" he shows a slide with a diamond dependency, and basically type classes, nothing bad happens |
| 2024-11-15 04:48:19 +0100 | <EvanR> | s/basically/because/ |
| 2024-11-15 04:49:14 +0100 | peterbecich | (~Thunderbi@syn-047-229-123-186.res.spectrum.com) (Remote host closed the connection) |
| 2024-11-15 04:49:14 +0100 | <EvanR> | because there's only ever zero or one instances for a given type |
| 2024-11-15 04:49:39 +0100 | <EvanR> | so if you arrive at a dependency along different routes it's the same instance |
| 2024-11-15 04:52:40 +0100 | ShannonB | (~ShannonB@user/ShannonB) ShannonB |
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| 2024-11-15 06:08:38 +0100 | <monochrom> | Multiple implementation inheritance is the problem (even the OO people already know), but it doesn't translate to Haskell. Multiple interface inheritance is well-known to be just fine. |
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| 2024-11-15 06:09:36 +0100 | <monochrom> | OTOH category theory offers a safe kind of diamond inheritance. It's called push out. |
| 2024-11-15 06:09:59 +0100 | <monochrom> | Just that you can't do push outs in C++, that's all. :) |
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| 2024-11-15 06:13:36 +0100 | <EvanR> | pushout = multiple inheritance. Got it. And jquery is a monad! |
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| 2024-11-15 06:39:29 +0100 | <monochrom> | haha |
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