#crystal-lang on 2017-01-17 — irc logs at freenode.irclog.whitequark.org

2017-01-07 22:37 RX14 changed the topic of #crystal-lang to: The Crystal programming language | http://crystal-lang.org | Crystal 0.20.4 | Fund Crystal's development: http://is.gd/X7PRtI | Paste > 3 lines of text to https://gist.github.com | GH: https://github.com/crystal-lang/crystal | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/ | Logs: http://irclog.whitequark.org/crystal-lang

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02:16 <FromGitter> <MaxLap> where is the allocate method defined? is it the one of pointer?

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02:39 <splitty_> MaxLap, pointer only has #malloc for allocation

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02:54 <FromGitter> <MaxLap> You're right, i mixed myself up with the comments. But i really can't find allocate, which confuses me

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03:44 <FromGitter> <bcardiff> @MaxLap https://github.com/crystal-lang/crystal/blob/master/src/compiler/crystal/codegen/primitives.cr#L405

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11:31 <FromGitter> <zatherz> is there a better way to check if a message has been sent in a channel than just having a buffered channel with capacity 2 and `!channel.empty?`?

11:35 <FromGitter> <zatherz> this (https://crystal-lang.org/api/0.20.1/Channel.html) channel of course

11:37 <Yxhuvud> What is the actual problem you are trying to solve? Please zoom out a little and perhaps we can give a more fitting solution.

11:38 <FromGitter> <zatherz> I have a channel that I want to use to send "events" to a loop from another fiber

11:39 <FromGitter> <zatherz> however, I don't want it to block until an event is sent every single time

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11:43 <RX14> what?

11:44 <FromGitter> <zatherz> I have a loop, and another loop running in a separate fiber

11:45 <FromGitter> <zatherz> the other loop running in a separate fiber polls stuff and from time to time sends an Event object through a channel

11:46 <FromGitter> <zatherz> the main loop is supposed to receive those events, but I don't want it to block on `channel.receive` until an Event object gets through

11:46 <FromGitter> <zatherz> but I think I see how I can make it properly

11:46 <FromGitter> <zatherz> just a separate dispatch fiber

11:47 <RX14> no...

11:47 <RX14> you need a nonblocking recieve

11:47 <RX14> right?

11:48 <RX14> so

11:48 <RX14> literally recieve?

11:48 <RX14> or wait does that block too

11:48 <RX14> thats just confusing

11:48 <RX14> you can use select regardless

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11:50 <FromGitter> <mjago> What can you do with an empty Slice (Slice(UInt8).empty) ?

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12:10 <FromGitter> <zatherz> hmmm

12:11 <FromGitter> <zatherz> I'm having difficulties printing to stdout from other fibers

12:11 <FromGitter> <zatherz> it only prints if I also print from the "main" fiber (not in any `spawn` block)

12:11 <FromGitter> <zatherz> and if I redirect it into a file it only prints what the main fiber printed

12:12 <FromGitter> <zatherz> even if I do `STDOUT.flush` it's still the same

12:13 <FromGitter> <zatherz> is this a bug, or is it intended? ⏎ ⏎ ```code paste, see link``` [https://gitter.im/crystal-lang/crystal?at=587e0a66873d96e16d7bb3ed]

12:13 <FromGitter> <zatherz> if you run that, it'll not print anything

12:13 <FromGitter> <zatherz> if you uncomment `puts "x"`, it'll print both `x` and `hi`

12:14 <FromGitter> <zatherz> and seemingly unconsistently

12:14 <FromGitter> <mjago> looks like the program finishes before it has time to print

12:17 <FromGitter> <mjago> @zatherz sri theres a loop! The loop is blocking. try ```loop do sleep 0.001 end```

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12:20 <RX14> @zatherz a loop will never yield to the scheduler

12:21 <FromGitter> <zatherz> Ooooooooh

12:22 <FromGitter> <mjago> ``````

12:22 <FromGitter> <zatherz> so I just have to call literally anything to yield to the scheduler?

12:23 <FromGitter> <zatherz> I guess I'm gonna do it differently

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12:38 <FromGitter> <mverzilli> @mjago see for example: https://github.com/crystal-lang/crystal/blob/master/src/http/web_socket/protocol.cr

12:40 <FromGitter> <mverzilli> `send` expects the body to be a `Bytes`, but some operations have a zero length body

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12:40 <FromGitter> <mverzilli> and `Bytes` is an alias for `UInt8`: https://github.com/crystal-lang/crystal/blob/master/src/slice.cr#L466

12:41 <FromGitter> <mjago> Yes I see the use there. Thanks for the info

12:43 <FromGitter> <mverzilli> you're welcome! usually when you want to know what's the use of something there's a good chance you'll find it out by searching for references in the stdlib or the compiler itself

12:44 <FromGitter> <mverzilli> that's a cool benefit of working with a self-hosted language

12:44 <FromGitter> <mverzilli> *sorry, should have said `Bytes` is an alias for `Slice(UInt8)`

12:46 <FromGitter> <mjago> :+1: I knew what you meant! I’m not sure an empty Slice should blow up with hexdump though since it is a legitimate Slice. I submitted an issue for that.

12:47 <FromGitter> <mjago> I love that Crystal is self-hosted :smile:

12:50 <FromGitter> <bcardiff> @zatherz also check for `Fiber.yield`

12:51 <RX14> @zatherz you have to either use IO or sleep to yield to the scheduler

12:51 <RX14> except file IO doesn't count

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12:55 <FromGitter> <mverzilli> @mjago, yeah, it definitely shouldn't blow up. it's an unhandled case

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13:44 <Kug3lis> What I am doing wrong here? https://gist.github.com/aurimasniekis/987f102126a962a11966bb2f9765076a

13:44 <Kug3lis> I am trying to dump crystal-db result set to json

13:45 <Kug3lis> but I got stuck with Slice(UInt8) aka Bytes type...

13:53 <FromGitter> <mverzilli> can you show how you're using it?

14:14 <FromGitter> <bcardiff> @Kug3lis, to define a to_json you should define `def to_json(json : JSON::Builder)` which allow you to use the build for efficient json output. Note: the `: JSON::Builder` is mandatory here otherwise some overload will collide. Check https://gist.github.com/bcardiff/58d2c8cec73b0971b6eb990d6311485c

14:32 <crystal-gh> [crystal] aurimasniekis opened pull request #3908: Added Int32 and Float32 to JSON::Type (master...feature/lower-size-types-for-json-type) https://git.io/vM6yf

14:32 <DeBot> https://github.com/crystal-lang/crystal/pull/3908 (Added Int32 and Float32 to JSON::Type)

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14:38 <crystal-gh> [crystal] asterite pushed 1 new commit to master: https://git.io/vM6Si

14:38 <crystal-gh> crystal/master aca9433 Ary Borenszweig: Fixed Slice#hexdump for empty slice. Fixes #3906

14:38 <DeBot> https://github.com/crystal-lang/crystal/issues/3906 (Slice#hexdump fails with negative capacity (ArgumentError) for empty Slice)

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15:07 <crystal-gh> [crystal] bcardiff pushed 1 new commit to master: https://git.io/vM6dJ

15:07 <crystal-gh> crystal/master 1b97c99 TSUYUSATO Kitsune: Annotate private to spec methods/classes more (#3892)

15:07 <DeBot> https://github.com/crystal-lang/crystal/pull/3892 (Annotate private to spec methods/classes more)

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15:41 <travis-ci> crystal-lang/crystal#aca9433 (master - Fixed Slice#hexdump for empty slice. Fixes #3906): The build passed. https://travis-ci.org/crystal-lang/crystal/builds/192701475

15:41 <DeBot> https://github.com/crystal-lang/crystal/issues/3906 (Slice#hexdump fails with negative capacity (ArgumentError) for empty Slice)

15:57 <crystal-gh> [crystal] asterite pushed 1 new commit to master: https://git.io/vM6j6

15:57 <crystal-gh> crystal/master 0cda903 Ary Borenszweig: Fixed #3907: ICE on tuple assignment

15:57 <DeBot> https://github.com/crystal-lang/crystal/issues/3907 (ICE on tuple assignment)

16:20 <crystal-gh> [crystal] Sija opened pull request #3910: Tweak OpenSSL docs (master...tweak-openssl-docs) https://git.io/vMiUO

16:20 <DeBot> https://github.com/crystal-lang/crystal/pull/3910 (Tweak OpenSSL docs)

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16:33 <travis-ci> crystal-lang/crystal#1b97c99 (master - Annotate private to spec methods/classes more (#3892)): The build was broken. https://travis-ci.org/crystal-lang/crystal/builds/192711582

16:33 <DeBot> https://github.com/crystal-lang/crystal/pull/3892 (Annotate private to spec methods/classes more)

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17:17 <travis-ci> crystal-lang/crystal#0cda903 (master - Fixed #3907: ICE on tuple assignment): The build passed. https://travis-ci.org/crystal-lang/crystal/builds/192728357

17:17 <DeBot> https://github.com/crystal-lang/crystal/issues/3907 (ICE on tuple assignment)

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18:22 <crystal-gh> [crystal] mjago opened pull request #3911: Fix example for NamedTuple.from (master...master) https://git.io/vMiE2

18:22 <DeBot> https://github.com/crystal-lang/crystal/pull/3911 (Fix example for NamedTuple.from)

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18:46 <crystal-gh> [crystal] firejox opened pull request #3912: [WIP] rewrite channel (master...rewrite-channel) https://git.io/vMi2N

18:46 <DeBot> https://github.com/crystal-lang/crystal/pull/3912 ([WIP] rewrite channel)

18:51 <crystal-gh> [crystal] bcardiff closed pull request #3908: Added Int32 and Float32 to JSON::Type (master...feature/lower-size-types-for-json-type) https://git.io/vM6yf

18:51 <DeBot> https://github.com/crystal-lang/crystal/pull/3908 (Added Int32 and Float32 to JSON::Type)

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21:56 <andrzejku> hey

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22:04 <crystal-gh> [crystal] Sija opened pull request #3914: Remove reduntant “?” from type definitions in bang accessors! (master...remove-question-marks-from-bang-accessors) https://git.io/vMPUT

22:04 <DeBot> https://github.com/crystal-lang/crystal/pull/3914 (Remove reduntant “?” from type definitions in bang accessors!)

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