#crystal-lang on 2016-09-26 — irc logs at freenode.irclog.whitequark.org

2016-09-16 23:05 RX14 changed the topic of #crystal-lang to: The Crystal programming language | http://crystal-lang.org | Crystal 0.19.2 | Fund Crystals 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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09:43 <bew78> Hello ! I've read somewhere that we should prefer struct over class, but I just read that class are passed by reference, and struct by value.. I thought reference is better, so why using struct ?

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09:50 <BlaXpirit> bew78, so where exactly did you read that?

09:50 <BlaXpirit> bew78, you use struct to avoid memory allocation on the heap and the need for garbage collection. if used carefully, it improves performance

09:51 <bew78> in the docs https://crystal-lang.org/docs/syntax_and_semantics/structs.html

09:51 <bew78> but, when something is passed by value, it makes a copy, am I right ?

09:51 <BlaXpirit> bew78, yes

09:52 <BlaXpirit> bew78, i still don't see where it says "prefer" or anything like thta

09:52 <bew78> Doesn't it takes longer than aloocating once on the heap, then pass it by reference?

09:52 <BlaXpirit> bew78, just imagine this

09:52 <BlaXpirit> class Point; property x, y: Float64; end

09:53 <BlaXpirit> and you make 10000 of points every second

09:53 <BlaXpirit> each of these points appears in a random place in the memory

09:53 <BlaXpirit> and the garbage collector has to keep track of all of them and delete them

09:54 <BlaXpirit> do you get how this can be very inefficient? (also mind the "random place" part - it also negatively affects CPU cache)

09:54 <bew78> hum I see, but how is it better with stack alloc ?

09:55 <BlaXpirit> bew78, well for one, if you have an array of points, they're all located in memory exactly one after the other

09:55 <BlaXpirit> but with class it's an array of references and each point is in a random location far away in the heap

09:56 <bew78> Nice point

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10:01 <bew78> Arrays are in heap and tuple in stack ?

10:03 <BlaXpirit> bew78, yes

10:04 <BlaXpirit> but anything can be in the heap, if there is at least one reference involved above it

10:04 <BlaXpirit> array of tuples will be in the heap, but the tuples will be located sequentially one after the other

10:10 <bew78> I'm not sure I understand your last msg.. the array is in the heap but the content of the array can be in the stack ?

10:10 <bew78> BlaXpirit:

10:11 <BlaXpirit> bew78, no, the content will not be in the stack

10:12 <bew78> sorry but then don't understand your exemple with array of tuples..

10:13 <bew78> +I

10:14 <bew78> BlaXpirit: sorry but then I don't understand your exemple with array of tuples..

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10:21 <BlaXpirit> bew78, very hard to follow the example, but here it is https://carc.in/#/r/1auf

10:22 <bew78> I have to leave for now, I'll look at this, then come back later

10:22 <bew78> BlaXpirit: thanks

10:22 <BlaXpirit> for whatever reason, the stack has a higher address than the heap

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13:34 <bew78> Hi, I'm trying to use the lib cli (https://github.com/mosop/cli) with the example for subcommands (https://github.com/mosop/cli#subcommands) But I get an error saying that it can't find the method 'caption' after a quick look at the code, 'caption' is a macro, but I don't know why crystal can't find it..

13:35 <bew78> Hi, I'm trying to use the lib cli (https://github.com/mosop/cli) with the example for subcommands (https://github.com/mosop/cli#subcommands) But I get an error saying that it can't find the method 'caption' after a quick look at the code, 'caption' is a macro, but I don't know why crystal can't find it..

13:57 <BlaXpirit> bew78, show code pls. maybe u forgot to subclass something

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14:11 <bew78> BlaXpirit: This is the sample given for subcommands at https://github.com/mosop/cli#subcommands

14:12 <bew78> I just added 'require "cli"' at the top

14:18 <BlaXpirit> bew78, i get the same error and have no idea what's going on with that lib

14:20 <bew78> ok, thanks. I'll open an issue and will try something else until it's resolved

14:21 <BlaXpirit> so i'm writing specs for my library and every test in a file needs a helper class. i think it would be a huge mess to dump those classes at the beginning or the end of the file because they make no sense alone. what are my alternatives?

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15:55 <bew78> Is there a way to use OptionParser on multiple level of options ? Exemple with git would be: an OptionParser on 'git' to handle 'clone'/'commit' etc.. and another OptionParser on 'commit' to handle commit options like '-m', '-a', etc.. ? how to get the leading Args to parse ?

15:55 <bew78> *pending args to parse

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16:09 <crystal-gh> [crystal] asterite pushed 2 new commits to master: https://git.io/vipyC

16:09 <crystal-gh> crystal/master cef67da Ary Borenszweig: Compiler: fixed a few wrong parse cases

16:09 <crystal-gh> crystal/master 612ff0f Ary Borenszweig: Fixed #3351: correctly restrict virtual generic instance type against generic

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16:30 <rkeene> Who wants to port the Wt bindings from Ruby to Crystal ? :-D

16:30 <rkeene> https://github.com/rdale/wtruby/tree/master

16:33 <RX14> it shouldn't be that hard...

16:33 <rkeene> I'm just hoping someone else does it since I don't want to :-D

16:34 <bew78> I didn't know that wt thing, it's pretty cool !!

16:35 <rkeene> Yeah, I was asking about it a while ago but nothing existed like it for Crystal and I just found out they have Ruby bindings

16:35 <rkeene> I wrote something similar to it for Tcl (a long time ago... 13 years ago)

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16:43 <rkeene> http://www.rkeene.org/viewer/projects/tkweb/tkweb-test1-2.png.htm :-D

16:45 <travis-ci> crystal-lang/crystal#cef67da (master - Compiler: fixed a few wrong parse cases): The build has errored. https://travis-ci.org/crystal-lang/crystal/builds/162826835

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17:21 <travis-ci> crystal-lang/crystal#cef67da (master - Compiler: fixed a few wrong parse cases): The build passed. https://travis-ci.org/crystal-lang/crystal/builds/162826835

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17:27 <crystal-gh> [crystal] Nephos opened pull request #3356: [WIP] Add StaticArray improvements (master...feature/better_static_array) https://git.io/vipxS

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17:52 <BlaXpirit> how can I get the type of the class that a macro was written inside, not the current type?

17:53 <BlaXpirit> for https://carc.in/#/r/1avi I want the output A \\ A

18:23 <crystal-gh> [crystal] asterite pushed 3 new commits to master: https://git.io/vihTX

18:23 <crystal-gh> crystal/master a41a742 Julien Portalier: Fix: missing Errno::E2BIG constant

18:23 <crystal-gh> crystal/master bf6b743 Ary Borenszweig: Merge pull request #3306 from ysbaddaden/core-fix-iconv-error-handling...

18:23 <crystal-gh> crystal/master 0f5c684 Julien Portalier: Fix: check return value of icon_open...

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19:03 <travis-ci> crystal-lang/crystal#bf6b743 (master - Merge pull request #3306 from ysbaddaden/core-fix-iconv-error-handling): The build passed. https://travis-ci.org/crystal-lang/crystal/builds/162862455

19:03 <DeBot> https://github.com/crystal-lang/crystal/pull/3306 (Fix iconv error handling)

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