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2020-10-02 00:05:49 → Velpoman joins (~Velpoman@159.65.76.124)
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2020-10-02 00:41:14 × conal quits (~conal@64.71.133.70) (Ping timeout: 260 seconds)
2020-10-02 00:42:17 <catern> pretty basic question, but is there any Haskell library where I can say some approximation of "f = F(); dothing(f); g = G(); h = H(); dothing2(g, h)" and have the requests made inside F, G, and H automatically get sent out together at the start?
2020-10-02 00:44:55 <dsal> I don't understand `F()`
2020-10-02 00:45:22 → conal joins (~conal@66.115.157.40)
2020-10-02 00:45:25 <dsal> Also: What does "request" mean?
2020-10-02 00:46:47 <dsal> If F, G, and H are meant to be monadic actions that depend on the results of each other, it's not clear what you mean by wanting to send the requests before you have their input.
2020-10-02 00:46:52 <catern> any kind of request, RPCs over the network, say?
2020-10-02 00:47:10 <catern> no, they're meant to be actions which don't depend on each others' results
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2020-10-02 00:47:35 <dsal> Oh. The syntax is confusing. Capitals generally refer to types.
2020-10-02 00:47:53 <dsal> The async packages has a lot of stuff for implicitly running multiple IO actions concurrently. It'd pretty easily do what you're asking for.
2020-10-02 00:48:06 <dsal> @package async
2020-10-02 00:48:07 <lambdabot> https://hackage.haskell.org/package/async
2020-10-02 00:48:46 <dsal> The example at the bottom of the Control.Concurrent.Async docs sound a bit like what you're asking for.
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2020-10-02 00:49:28 <catern> i'd have to explicitly run things with async though right? i'm more curious about something automatic
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2020-10-02 00:50:28 × Gurkenglas quits (~Gurkengla@unaffiliated/gurkenglas) (Ping timeout: 260 seconds)
2020-10-02 00:51:33 <infinisil> catern: The usual way to define variables with do notation won't work for your example
2020-10-02 00:51:56 <infinisil> Because do notation makes later values able to depend on earlier ones
2020-10-02 00:52:20 <infinisil> So e.g. you could say `f <- ffun(); g <- gfun(f)`
2020-10-02 00:52:50 <infinisil> Well actually, that's not entirely true, there's ApplicativeDo
2020-10-02 00:53:03 <infinisil> Anyways, I think maybe you're looking for Applicative's in general
2020-10-02 00:53:18 → jscarmona joins (~jscarmona@s91904426.blix.com)
2020-10-02 00:53:54 <infinisil> So you could do `(f, g, h) <- (,,) <$> ffun <*> gfun <*> hfun`
2020-10-02 00:54:05 → conal joins (~conal@66.115.157.40)
2020-10-02 00:54:25 <infinisil> And run that in a context where those are run in parallel
2020-10-02 00:54:31 → nbloomf joins (~nbloomf@2600:1700:83e0:1f40:7d12:c491:8a2c:d3a6)
2020-10-02 00:54:39 <infinisil> E.g. as dsal suggested with async
2020-10-02 00:54:51 × conal quits (~conal@66.115.157.40) (Client Quit)
2020-10-02 00:55:27 <infinisil> catern: And in fact, async has an example for exactly that: https://hackage.haskell.org/package/async-2.2.2/docs/Control-Concurrent-Async.html#t:Concurrently
2020-10-02 00:57:08 <dsal> Automatically transforming a block into a collection of actions and then running those actions concurrently sounds like a neat idea, and is likely possible, but I'd think it'd be fairly special for your operations.
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2020-10-02 00:58:23 <catern> infinisil: interesting, thanks!
2020-10-02 00:58:35 <dsal> Your syntax is confusing me a bit, but it sounds like you want `dothing` and `dothing2` to be actions as well. In which case, why wouldn't they also happen concurrently at the beginning? You'd need a way to build a dependency of actions and run them as concurrently as you could as they are evaluated. Doing that explicitly isn't *super* hard, but doing it magically raises a lot of questions.
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