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2021-07-20 16:59:35 × argento quits (~argent0@168-227-96-26.ptr.westnet.com.ar) (Ping timeout: 255 seconds)
2021-07-20 17:00:47 → azeem joins (~azeem@176.200.211.15)
2021-07-20 17:01:29 <monochrom> Are we meant to do some kind of union, perhaps disjoint union, of V1xE2 and E1xV2 for the new set of edges?
2021-07-20 17:04:02 × drd quits (~drd@2001:b07:a70:9f1f:1562:34de:f50f:77d4) (Ping timeout: 256 seconds)
2021-07-20 17:04:41 <monochrom> I think I may define "data BoxProdV v1 v2 = MkBoxProdV v1 v2" and "data BoxProdE v1 e1 v2 e2 = ???". Then "instance (G v1 e1) (G v2 e2) => G (BoxProdV v1 v2) (BoxProdE v1 e1 v2 e2)" can make sense.
2021-07-20 17:05:06 <monochrom> err, instance (G v1 e1, G v2 e2) => G (BoxProdV v1 v2) (BoxProdE v1 e1 v2 e2)
2021-07-20 17:06:09 × dunkeln_ quits (~dunkeln@188.71.231.232) (Ping timeout: 255 seconds)
2021-07-20 17:06:18 <metaweta> > disjoint union, of V1xE2 and E1xV2 for the new set of edges
2021-07-20 17:06:19 <metaweta> yes
2021-07-20 17:06:20 <lambdabot> <hint>:1:15: error: parse error on input ‘,’
2021-07-20 17:07:56 <metaweta> so I guess "data BoxProdE v1 e1 v2 e2 = Horz v1 e2 | Vert e1 v2"
2021-07-20 17:08:29 <monochrom> Yeah
2021-07-20 17:08:31 <metaweta> How do you capture the functions s and t as part of the graph?
2021-07-20 17:08:39 <monochrom> I don't know.
2021-07-20 17:09:04 <monochrom> Haven't learned box product, much less what it does to s and t.
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2021-07-20 17:12:22 <metaweta> s and t pick out the source and target of an edge. So given an edge e1:u1->v1 and an edge e2:u2->v2, the horizontal edges are (u1, e2):(u1,u2)->(u1,v2), (v1, e2):(v1,u2)->(v1,v2), (e1, u2): (u1,u2) -> (v1,u2) and (e1,v2):(u1,v2)->(v1,v2)
2021-07-20 17:12:37 <metaweta> sorry the last two are the vertical edges
2021-07-20 17:13:50 <metaweta> the box product of two edges is a box (as opposed to the categorical product which also has a diagonal (e1,e2):(u1,u2)->(v1,v2))
2021-07-20 17:16:04 <h98> why not just define BoxProduct e1 v1 e2 v2 as a multiparam type class and implement an instance for the constraint that E1 V1 and E2 V2 form directed multigraphs?
2021-07-20 17:16:29 → lavaman joins (~lavaman@98.38.249.169)
2021-07-20 17:17:55 <metaweta> Yeah, I was thinking "class G e v where s::e->v; t::e->v"
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2021-07-20 17:21:14 <metaweta> How would I write the constraint in the instance declaration? "instance G e1 v1, G e2 v2 => BoxProduct e1 v1 e2 v2 where ..." ?
2021-07-20 17:22:06 <h98> instance (G e1 v1, G e2 v2) => BoxProduct e1 v1 e2 v2 where
2021-07-20 17:22:09 × __monty__ quits (~toonn@user/toonn) (Ping timeout: 268 seconds)
2021-07-20 17:22:22 <metaweta> thx, will try
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2021-07-20 17:29:12 <metaweta> I've got "instance (G v1 e1, G v2 e2) => G (v1, v2) (BoxProduct v1 e1 v2 e2) where s Horz v e = (v, s e); t Horz v e = (v, t e); s Vert e v = (s e, v); t Vert e v = (t e, v)"
2021-07-20 17:30:11 <metaweta> I'd like to define the behavior of s,t on the new instance in terms of s,t on the given instances. What's the right way?
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2021-07-20 17:57:08 <zzz> dminuoso: thanks
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2021-07-20 18:13:59 <lechner> Hi, is Opaleye a good way to write typesafe and composable code to query a Postgres database? https://hackage.haskell.org/package/opaleye
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2021-07-20 18:45:42 <maerwald> ok, so I finally broke hlints parser with quasi quotes too
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2021-07-20 18:47:17 <monochrom> :)
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2021-07-20 18:48:50 <maerwald> #{bc}|] -- is the closing line of a quasi quote...
2021-07-20 18:48:56 <maerwald> it's probably thinking... hmm, CPP?
2021-07-20 18:49:40 <monochrom> yeah
2021-07-20 18:50:08 <monochrom> How recently was hlint updated anyway?
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