<< 05-03-2017 >>
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01:11:57krux02hello does someone know how to concatenate two identifiers into one within a template?
01:12:18krux02I think I remember that it is somehow possible, but I can't remember how to do it.
01:24:39def-pri-pubYou might have to mess with macros to do that
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02:55:20def-pri-pubQuestion: the float type is a 64 bit type. correct?
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03:46:42Lord_Nightmaredef-pri-pub: not sure. in c, float is 32 bit, double is 64 bit and long double is 80 bit for compilers/systems which handle it
03:47:20Lord_Nightmaresome processors and compilers support a quadruple or quad of 128 bits but it isn't standard afaik
03:50:45Lord_Nightmarein nim, i'm not sure.
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05:24:59krux02float is 64 bit at least of 64 bit systems. I think it is 32 bit on 32 bit systems. Just use float32 and float64 when you want a specific size.
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05:27:39cheatfate_def-pri-pub, float = float64 for Nim, afaik
05:28:14cheatfate_def-pri-pub, but krux02 is right, better use float32/float64 :)
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06:03:20Serenitorwould someone be able to tell me if this is broken or if i am just stupid? http://up.r00t.li/20170305_vivaldi_sl3U.png
06:04:32cheatfateSerenitor, you've got problems while trying to register on forum?
06:04:55Serenitoryea that screenshot is from https://forum.nim-lang.org
06:05:28cheatfatetry one more time with different captcha
06:06:56Serenitorheh, I always get the 8+91 even after clearing cache
06:07:18Serenitorin any browser
06:09:16cheatfatehmm, could you please fill an issue here https://github.com/nim-lang/nimforum/issues?
06:09:53cheatfateit looks like a bug
06:10:07cheatfatebut currently there no admins online to help you
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06:13:24Serenitorkk, thanks cheatfate
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06:19:27Serenitoralright cheatfate, I just now tried again and it worked. guess it was only temporary. thanks again
06:25:22cheatfateSerenitor, welcome aboard :)
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07:55:54FromGitter<Varriount> demi- : You can't get a safe reference to an *existing* object, as there's no guarantee that the object's data is on the heap.
07:56:12FromGitter<Varriount> What you can do is copy the object's data to a reference.
07:57:34FromGitter<Varriount> `var objectRef: ref ObjectType;new(objectRef);objectRef[] = objectValue`
07:58:02FromGitter<Varriount> Those empty square brackets may not be needed.
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14:24:30demi-thanks varriount, so there is no concept of a weak reference to an existing object to prevent having to do copies when performing assignment?
14:31:29demi-Araq: are you around? I had some questions about using objective-C blocks with the FFI, and if you had any pointers for that
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14:38:43Araqdemi-: hey
14:38:50demi-hi
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14:40:29demi-I was wondering if you every looked at how bridging of blocks (libclosure) would work in nim. I was trying it last night and ran into some typing issues where the methods that would take a block wouldn't accept a function
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15:04:23Araqdemi-: can you give some snippet to look at?
15:18:46demi-sure, give me a minute to put one together for you
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15:39:10demi-Araq: here is the error I get: https://gist.github.com/samdmarshall/bc6f1ad9e4cb7061d06c273178dfdca8 and here is the respective code: https://github.com/samdmarshall/snippets/tree/master/nim-blocks
15:41:55Araq proc (value: cdouble): int is not compatible to proc (value: cdouble): cdouble
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15:54:12demi-Araq: sorry, my bad, this is the one i was encountering last night: https://gist.github.com/samdmarshall/ef1684e3825fdce1e38f0e0e50eef1d1 and i've updated the code respectively: https://github.com/samdmarshall/snippets/tree/master/nim-blocks
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15:56:24AraqI don't know what 'int (^)(double)' is
15:57:01Araqyou need to use .emit to create Objective C syntax for the "block" that then calls the nim proc
15:57:45demi-https://en.wikipedia.org/wiki/Blocks_%28C_language_extension%29
15:59:07demi-that is what i ended up doing, but it seems extremely crude especially when a lot of APIs use these as parameters to method calls -- in implementation they are quite (including implementation details) to anonymous function callbacks
15:59:41FromGitter<Varriount> demi-: The way Nim constructs closures and how Objective C constructs blocks is very similar
16:00:01demi-I am looking for interop with them varriount
16:03:26Araqdemi-: that wiki article doesn't tell me the layout Objective C uses
16:04:03demi-the docs in the root here should do it? https://opensource.apple.com/source/libclosure/libclosure-67/
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16:10:48FromGitter<Varriount> Specifically, this file looks good:https://opensource.apple.com/source/libclosure/libclosure-67/Block_private.h.auto.html
16:12:49FromGitter<Varriount> As well as https://opensource.apple.com/source/libclosure/libclosure-67/BlockImplementation.txt.auto.html
16:17:51Araqdemi-: ok, well that's some complex runtime representation
16:18:21Araqand not compatible with Nim's closures (which only consist of 2 memory words)
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16:37:32demi-Araq: hmmm, ok; how far off is the compile-time FFI then? I think I can making a bridge pretty easily for this through some codegen through an `emit`
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16:39:02demi-sorry, the context for this is the `static` keyword
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17:03:58Araquse staticExec instead of the compile-time FFI
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17:10:10demi-sorry, i mean this: https://nim-lang.org/docs/manual.html#statements-and-expressions-static-statement-expression it says that later versions of nim will support this, how far off is that?
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17:39:11ehmry[m]what do you folks think is better ``newClient(host, port); connect()`` or ``newClient(); connect(host, port)``
17:40:53dom96The latter. But the former can also work, depending on what the client connects to.
17:44:03ehmry[m]yea, in the case of multisync its better to have more code in connect() than new()
17:46:22Araqdemi-: that's not planned anymore. :-)
17:46:33Araqneed to update the manual
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20:02:28demi-Araq: :(
20:03:08Araqdemi-: staticExec works fine for this
20:03:27demi-can you explain what you mean by that? i'm not sure if i completely follow
20:06:09Araqyou write a Nim or Objective-C program that outputs what you're interested in and read that output via staticExec
20:12:19demi-would i be able to use a macro to emit objective-c code based on the compile-time nim types it gets passed?
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20:15:53stisademi- I think a proc with {.compiletime.} and a ``when passedtype is type`` block should work
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20:38:16Araqdemi-: yes
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21:07:22demi-how would i generate a nim-type at compile time? i don't think i fully understand how to use the emit pragma plus the macros module to do this
21:07:46Araqmacros.getType() and others
21:08:40Araqyou don't generate the type, you only generate an AST resembling a type and let Nim construct a type out of this, types are hard
21:09:16Araqbut it sounds more like you need to analyse an already existing type, macros.getType can do that
21:09:54demi-so i'm emitting some objc code that constructs the block variable for me, and i think i'm close to getting this working but I need to get the type over into nim now so i can import the correct type alias to nim to do the work for me
21:11:41demi-so i think all i need here is to tell nim "there is this variable with associated type, alias to that; like C's `extern`
21:13:12AraqI can't follow :-)
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21:15:30demi-sorry, so i have a template that emits objc code that declares a block, and makes it call a nim procedure. when that gets emitted, i create a static block variable with a specific name; i want to import that specific variable back into my nim code so i can reference the block pointer and pass it to the my FFI'd objective-c code.
21:16:38demi-i'm trying to work out how i would declare a const with that specific name automatically
21:21:14Araqwhy do you have to declare the block?
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21:23:21demi-so i can reference it in the nim code, otherwise i might as well just write it all in objc
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21:55:27Araqyeah sure, but you can pass the name to the template until you feel comfortable with macros and gensym()
21:56:00Araqor maybe
21:56:36Araqvar blck: type(placeholder)
21:57:47Araq{.emit: [type(returntype), " ", blck, "^{", nimProc, "}"].}
21:57:53Araqblck
21:58:05Araqwell, you get the idea
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22:16:14demi-yeah, i'm trying to play with the macros module on its own right now to get a better feel for this -- it is very unlike anything i've had access to in a programming language before, so this is pretty interesting.
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23:20:51SusWombatVladar, Hey im currently using your sdl bindings and im looking at your examples (thanks for that). Is there a specific reason to use logCritical over echo or a different loggin module?
23:21:53VladarSusWombat, no specific reason, it's just there in sdl2 so I used it
23:22:04SusWombatOk thank you :)
23:22:07Vladarnp
23:26:47krux02Vladar: I am still using the SDL from the official repository, but I see a few things that are just better in your repository.
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23:27:49Vladarkrux02: events or something else?
23:28:04krux02not only
23:28:50krux02I just made a pull request recently to the "official" sdl2 bindings, because they had untyped macros for things that were only used with cint arguments
23:29:25krux02and yes of course events are a lot better
23:30:22krux02even though I think the best way would be to port events to object: case kind of ...: structure
23:31:03VladarI believe it is c2nim which converts c-defines to templates with untyped arguments.
23:31:22krux02that breaks code that uses cast like the in sdl2 example on nim-lang/sdl2
23:31:34krux02Vladar: that is totally correct
23:31:45krux02it better than nothing, but it can be improved
23:34:03VladarThe variant object might be incompatible with the sdl2 event structure, I guess
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23:51:17krux02Vladar: actually I tested it once, it works
23:51:34krux02there is just one thing you need to do when you want to implement it
23:51:52krux02every SDL event starts with the enum value
23:52:02krux02you have to take that enum out of the event type
23:53:43krux02so you can't just use the sdl2 event types