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2020-11-18 04:31:36 → cads joins (~cads@ip-64-72-99-232.lasvegas.net)
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2020-11-18 05:03:30 hackage hyraxAbif 0.2.3.26 - Modules for parsing, generating and manipulating AB1 files. https://hackage.haskell.org/package/hyraxAbif-0.2.3.26 (andrevdm)
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2020-11-18 05:11:30 hackage hyraxAbif 0.2.3.27 - Modules for parsing, generating and manipulating AB1 files. https://hackage.haskell.org/package/hyraxAbif-0.2.3.27 (andrevdm)
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2020-11-18 05:53:43 → larou joins (5eae2591@gateway/web/cgi-irc/kiwiirc.com/ip.94.174.37.145)
2020-11-18 05:53:53 <larou> hello!
2020-11-18 05:57:02 → merijn joins (~merijn@83-160-49-249.ip.xs4all.nl)
2020-11-18 05:57:59 <larou> unclechu your looking for defunctionalisation
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2020-11-18 06:00:01 × ksamak quits (~ksamak@195.206.169.184) ()
2020-11-18 06:00:27 <larou> <unclechu> it is still impossible in GHC to use higher-order type families? i mean that i can’t use partially applied type family as an argument for another type family
2020-11-18 06:00:30 <larou> yes you can
2020-11-18 06:00:33 <larou> defunctionalise it
2020-11-18 06:01:08 <larou> type level functions as first class citizens, modulo, defunctionalization
2020-11-18 06:01:41 <larou> then your type level map is easy
2020-11-18 06:01:55 × merijn quits (~merijn@83-160-49-249.ip.xs4all.nl) (Ping timeout: 260 seconds)
2020-11-18 06:02:45 <larou> type family Map :: (f :: a ~> b) -> m a -> m b
2020-11-18 06:03:12 <larou> erg, Map :: (f a ~> b) -> m a -> m b
2020-11-18 06:03:29 <larou> Map :: (a ~> b) -> m a -> m b
2020-11-18 06:03:31 <larou> sorry
2020-11-18 06:05:08 <larou> type family Map (f :: a ~> b) (xs :: [] a) :: m b where Map _ '[] = '[]; Map f (x ': xs) = f @@ x ': Map f xs
2020-11-18 06:05:25 <larou> that @@ is because f :: a ~> b, not f :: a -> b
2020-11-18 06:06:51 <larou> https://pastebin.com/raw/U4Bd48Cq
2020-11-18 06:07:21 <larou> and you make type instances for Apply for defunctionalisation symbols
2020-11-18 06:07:44 <larou> that you want to apply using Map
2020-11-18 06:08:07 <larou> that is, for every ~> you use, in order to get something of that type, you have to "defunctionalise it"
2020-11-18 06:08:26 <larou> which consists of writing a datatype and making it an instance of apply
2020-11-18 06:09:00 × jedws quits (~jedws@101.184.175.183) (Remote host closed the connection)
2020-11-18 06:09:10 <larou> the type of the datatype you make has the same type signature as the type family you defunctionalising, except with ~> instead of ->
2020-11-18 06:09:25 <larou> and you need one extra symbol for each arrow you change
2020-11-18 06:09:36 → jedws joins (~jedws@101.184.175.183)
2020-11-18 06:09:55 <larou> the instance takes the function and its arguments, what it means to "Apply" the datatype
2020-11-18 06:10:30 <larou> and simply calls the type family, or another defunctionalisation symbol that has fewer ~>
2020-11-18 06:11:09 <larou> in order to build up all the symbols allowing apply to be chained over multiple inputs like f @@ x @@ y
2020-11-18 06:15:14 <unclechu> larou: thanks! i’ll dive into this later
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2020-11-18 06:43:55 <Axman6> @hoogle (@@)
2020-11-18 06:43:56 <lambdabot> Data.Singletons (
2020-11-18 06:43:56 <lambdabot> Data.Singletons type a
2020-11-18 06:43:56 <lambdabot> Diagrams.Angle (
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