<< 17-04-2015 >>
00:01:59polkmhow to do "addr array[0]" but for seq instead?
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00:02:34polkmcan I get the internal array of a seq?
00:02:48flaviu.eval echo(repr(addr((@[])[0])))
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00:02:57polkmlike .c_ptr
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00:03:32polkmwhat does repr do?
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00:05:03flaviuIt prints things in a form where they are useful for debugging.
00:05:24flaviu.eval echo(repr(addr((@[])[0])))
00:05:25Mimbusflaviu: eval.nim(3, 10) Error: expression has no address
00:05:41flaviu.eval var a: seq[int] = @[]; echo(repr(addr(a[0])))
00:05:44Mimbusflaviu: Error: unhandled exception: index out of bounds [IndexError]
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00:06:16polkmhmm, opengl doesn't like that
00:06:59flaviu.eval var a: seq[int] = @[1]; echo(repr(addr(a[0])))
00:07:00Mimbusflaviu: ref 0x7f9463383060 --> 1
00:07:01flaviuthere we go.
00:07:28flaviuThat's an address to an int, and 0x7f9463383060++ is the next element in the seq.
00:07:45polkmshit that should work
00:07:51polkmbut it doesn't
00:07:53polkmone sec
00:07:58flaviuwell, I suppose that ++ is only valid in C, and only for char*
00:09:28polkmdoes anythign in this look wrong? http://pastebin.com/AixiLhN9
00:10:33polkmdisregard, sizeof(seq) is borked or something
00:11:14polkmdisregard, sizeof(seq) is borked or something, got it to work by replacing it with "sizeof(uint32).int32 * indices.len.int32"
00:11:45polkmoops
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00:15:18polkmis repr the same as $?
00:17:34flaviuNo, totally different.
00:17:35fowlmouthpolkm, i fixed it last night
00:17:45fowlmouthcheck my fork of nim-assimp
00:18:04flaviu.eval var a: seq[int] = @[1]; echo(a, ", ", repr(a[0]))
00:18:06Mimbusflaviu: @[1], 1
00:18:22flaviuerr, that was a bad example.
00:19:05flaviu.eval echo("asd", ", ", repr("asd"))
00:19:06Mimbusflaviu: asd, 0x43c970"asd"
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01:43:45polkmfowlmouth, thanks man thats super helpful!
01:44:02polkmflaviu, thanks too
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03:37:05transfuturisthttps://github.com/transfuturist/outlet
03:38:14polkmwow thats fucking dank
03:40:54transfuturistforetwennyblazblue
03:51:02dtscodeomfg i love this
03:53:45dtscodei wonder how hard it would be to make this a compiler option...
03:54:16transfuturistthat was my first tack, but it turned out swapping was already supported
03:54:39dtscodehotswapping is already supported in nim?
03:54:44dtscodelike with -i?
03:54:56transfuturistno, with the dynlib package
03:55:03transfuturistthis is a wrapper over that
03:55:06transfuturisthttp://forum.nim-lang.org/t/627/1#7038
03:55:21transfuturister, look at reactormonk's comment
03:55:33dtscodeah
03:56:57dtscodeso its essentially dlopen for nim
03:57:29transfuturistyeah
03:57:49transfuturistconcise definitions of apis that you statically link, and can unload and reload at will
03:58:02transfuturistlike handmade hero
03:58:05dtscodehmmmm
04:13:12reactormonktransfuturist, you still need a parameter to exportc to denote the name you wanna export it as
04:14:43transfuturistit works without that, though...
04:15:06transfuturistwould that maybe be part of the symbol conflict problem?
04:17:00*transfuturist crosses fingers
04:17:54transfuturistno, if the parameter to exportc is missing the exact identifier is what is exported
04:20:05transfuturisti need to make a test that breaks on the symbol conflict.
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08:48:13coffeepotGood morning everyone :)
08:48:22BlaXpirithi
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08:58:52coffeepotwhen using var s:cstring do I need to call new(s) on it?
09:00:03coffeepotalso, not sure how I allocate a fixed length cstring if anyone knows?
09:00:31BlaXpiritcoffeepot, why not use var s: string
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09:01:28coffeepotI'm not sure I can, trying to call a c func that takes PSQLCHAR, which is a cstring
09:01:42coffeepotthe function writes to the string as a buffer
09:02:17BlaXpiritcoffeepot, i dunno, maybe it should be array of char
09:03:15coffeepotI thought the same, but not sure if I can just cast a char array to a cstring safely
09:03:23fowlmouthcoffeepot, you can use string
09:03:45coffeepotI can? That's great :D
09:05:48coffeepotahhh I know where I was going wrong! Declaring a string (or a cstring) doesn't initialise it, so it starts off as nil until I put = "" :)
09:05:59coffeepotlesson learned :)
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09:06:42fowlmouthcoffeepot, you want newStringOfCap()
09:07:00coffeepotfowlmouth: brilliant, just what I need, cheers :)
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12:25:29endragoris it possible to get size (length) of a Slice?
12:25:41endragorin generic way
12:27:29endragor`ord(s.b) - ord(s.a) + 1` I guess
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14:31:06Araqhi Flaise welcome
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14:37:49FlaiseHi
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15:11:09coffeepotI have a weird problem, I wonder if anyone can enlighten me. I have a string defined thus: sqlState = newStringOfCap(6) and I'm calling a C function that's passed this sqlState str directly. The function populates it with a string, and if I echo sqlState I get what I expect. What I can't work out though, is if I do: echo "test " & sqlState it disp
15:11:09coffeepotlays "test " but only the first letter of sqlState! Doing echo sqlState displays it normally. I can't give a short example of this unfortunately :-/
15:12:16coffeepotjust wondering if anyone's encountered this before.
15:12:17fowlmouthwhat c function
15:12:24Araqcoffeepot: it's simple
15:12:38AraqnewStringOfCap() gives you effectively a buffer to work with
15:12:38coffeepotthe c fun is SQLGetDiagRec
15:12:55Araqhowever, C stores something in there and then a \0
15:12:59fowlmouththe character after the ' ' is '\0' but the strings length is off
15:12:59Araqnow
15:13:20Araqecho prints up to the \0 due to a hard to fix bug
15:13:35Araqbut & reads the string's length
15:13:37fowlmouth SQLSMALLINT * TextLengthPtr
15:13:43Araqwhich you didn't set at all
15:14:00coffeepotahhhhhhh!!! Thanks Araq that makes sense :)
15:14:06Araqyou need to call mybuffer.setLen(whatever)
15:14:07fowlmouthuse that to set the str len after the call
15:15:01coffeepotalso cheers fowlmouth :)
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15:24:02pidghello. In https://github.com/Araq/Nim/issues/2361, Araq says 'You cannot capture openArray/varargs or 'var T' as that would violate memory safety.' What does he mean by 'capture' there? I struck out when googling.
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15:24:38Araqpidg:
15:24:56Araqproc outer(toCapture: var int): auto =
15:25:09Araq return proc (): int = toCapture
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15:25:41Araqif an inner proc accesses stuff in an outer scope that process is called "capturing"
15:25:59pidgah. As in a closure?
15:26:04Araqexactly
15:26:12pidggonna stare at that for a sec, pretty sure that clears it up.
15:26:13pidgthanks
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15:27:53Araqpidg: maybe the literature uses a different verb, I cannot remember ;-)
15:30:43pidgI'm new to nim, so it wasn't obvious to me that 'xs' was being accessed in a block that was closed over. I'm not sure about terminology of closures either, just know the word 'closure' :) Thanks for the response
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15:33:59Araqpidg: the workaround is trivial of course, copy it into a local variable and capture that instead
15:34:08fowlmouthlet xs = @xs
15:34:28Araqor use 'ptr' if you need to write to it (but ensure it lives long enough!)
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15:37:30pidgaraq, fowlmouth: got it.
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16:01:28renesachas someone wrote something using non-copying slices in nim yet?
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16:01:55EXetoChttps://github.com/AdrianV/nimrod-tools/blob/master/seqslices.nim
16:02:08renesacI'm needing that now (started using an extra "offset" parameter, but then caugth myself using seq.len)
16:02:22renesacthanks
16:02:38EXetoCoh yeah that's really old
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16:36:10renesacnimfix gives this error when I try to compile it:
16:36:14renesaccompiler/commands.nim(58, 15) Error: cannot open 'doc/basicopt.txt'
16:48:20fowlmouththis is cool https://github.com/transfuturist/outlet im going to try using it in a project
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17:32:04ArrrrrHello Nimrod.
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17:34:24ArrrrrIs there a friendlier way to handle ptr creation than 'cast[ptr ObType](alloc(sizeOf(ObType)))' ?
17:35:21BlaXpirit_stop with the rods :|
17:35:48BlaXpirit_Arrrrr, what are you doing?
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17:36:15ArrrrrNothing, just playing with pointers. I have nothing i nmind.
17:36:29BlaXpirit_well u dont need pointers, unless you really do
17:36:50ArrrrrSo, when i do, i have no alternative than 'castlongsentence' ?
17:36:58BlaXpirit_let me check one more thing
17:37:17ArrrrrI var you check that thing.
17:38:12BlaXpirit_Arrrrr, so... the friendlier way is to use `addr`
17:38:56BlaXpirit_create whatever you want normally, then take its address
17:39:12BlaXpirit_unless you're absolutely sure you need to allocate like this. i never needed it.
17:39:31AraqArrrrr: there is also system.create and stuff
17:40:10Araqand even if not, a nice syntax is usually a template away in Nim
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17:42:05ArrrrrOh god, that create makes a difference, thanks Araq. So, create is the 'new' for ptr.
17:42:44ArrrrrOne day i'll learn templating, but not yet.
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18:02:40renesacand if I try to run nimfix with --styleCheck:auto it gives:
18:02:42renesacError: system module needs 'shared'
18:02:53renesac(after I disabled that line complaining above
18:03:59Araqrenesac: don't install nim, compile like it like we tell you to do it
18:04:11Araqand then nimfix builds and should work
18:04:26renesac?
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18:04:41renesacI recompiled nim from the last git devel
18:04:58renesacthe Nim/bin directory is on path
18:05:04renesacand I dropped nimfix there too
18:05:21renesacas the nimfix user guide says to
18:08:23Araqwell but the error makes no sense
18:08:38Araqsystem module doesn't need 'shared' anymore
18:10:51renesacnimfix -v
18:10:51renesacNim Compiler Version 0.10.3 (2015-04-17) [Linux: amd64]
18:11:11renesacI don't know what is happening
18:12:13BlaXpirit_in any uncertain situation: start from scratch
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18:12:39Araqwhat does nimfix say about its search path?
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18:25:54filwitdom96: any chance you can review and merge my Aporia PR soon? It's been ready for awhile and improves/fixes quite a few things.
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18:39:12ArrrrrI think every type by default should overload toString ('$'), maybe behave as repr.
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18:40:11EXetoCArrrrr: it is available for all values types
18:40:29Arrrrr$ ?
18:40:35EXetoCyep
18:41:27EXetoC.eval type T = object; x: int; y: int; echo T()
18:41:30MimbusEXetoC: (x: 0, y: 0)
18:42:08ArrrrrYou are right, i dont know how i missed that. Maybe i tried with a ref
18:42:28Arrrrryes, it was that.
18:43:25ArrrrrWhy doesn't work in this case?
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18:44:54Arrrrr(unless you deference it, which most of the times is what you want anyway)
18:47:26EXetoCbecause the tuple|object doesn't take pointer/refs of tuples/objects
18:48:22Arrrrrwut
18:49:57EXetoC"proc `$`*[T: tuple|object]..." and then some other overloads, none of which accepts refs
18:51:17ArrrrrAh, ok. Thanks for your explanations EXetoC. Would not be possible to add one overload for refs/ptr ? In case is null, just echo type+[null], in other case deference it and call return $
18:52:09Arrrrr(by echo i mean return)
18:52:49EXetoCit's possible
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18:54:33ArrrrrAnd desirable, in my opinion.
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19:09:52AraqOnO: tests/parser has a couple of tests including tests that should fail with a particular error message
19:12:15OnOthis with discard """ ?
19:13:55OnOtester checks this discard header or #ERROR_MSG comment?
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19:14:10Araqthe discard header
19:14:23Araqthe #ERROR_MSG comment is obsolete
19:14:34Araq(it used to be parsed)
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19:21:50alex99I see bug reports about nim traits and concepts and there were some forum posts about type classes
19:22:02alex99where I can read more about traits/concepts/typeclasses?
19:22:12alex99there doesn't seem to be anything in official docs
19:23:06Araqthere are some docs in devel, but yes, very sparse
19:24:46alex99oh i see, in doc/manual/generics.txt
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19:25:48KimSchmitzhow would I go about debugging my nim proggie with linux?
19:27:31Araquse one of the various GDB frontends and compile with --debugger:native
19:28:17Araq(--debugger:native is new in devel, for 0.10.2 use --linedir:on --debuginfo)
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19:34:57KimSchmitzthanks araq, I am still on arch linux included 10.2 ..
19:35:16KimSchmitz0.10.2
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19:37:32ArrrrrI have to go, see you nimroders.
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19:42:56samldoes context aware macro make sense?
19:43:18samlmacro expands different depending on context
19:43:21Araqsaml: depends on what you mean by "context"
19:43:46Araqin general: yes it does. see overloading resolution. ;-)
19:44:19samllet's say i want to implement malloc() as macro so that it knows about copying of ownership.. frees automatically when it goes out of scope and no copy of ownership has been there
19:45:00samlhttp://nim-lang.org/manual.html#overloading-resolution To be written
19:47:26Araqpfff documented in devel :P
19:48:07Araqsaml: I doubt you can implement that as a macro
19:48:44Araq"no copy of ownership has been there" ... so you want an escape analysis. not possible as a macro.
19:49:03samlyah. just wondering instead of baking those stuff into language, what would it look like if language provided a programmable way
19:49:41samlso the core of language is simple.. but stdlib can include all niffy malloc ...e tc
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19:56:48Araqsaml: it's not feasible to make complex analyses like that "programmable", Nim actually goes a long way to this goal via its TR macros
19:57:43Araqbut there is a point where it breaks down
19:57:57samlwhat's tr macro?
19:58:10Araqa term rewriting macro
19:58:40samlmaybe better approach is to have programmer write some sort of proof. and compiler checks program against the proof
19:58:54Araqer ... that's even worse ;-)
19:59:09samlor just use garbaeg collector :P
19:59:47Araqwell thinking about it ... TR macros with builtin "escapes/doesntEscape" constraints could be cool
20:00:32Araqtemplate optMalloc{malloc(a, b, c)](a, b, c: expr{doesntEscape}) = ...
20:01:06EXetoCare there any TR examples that focus on functionality rather than optimizations?
20:02:39Araqno, their design actively tries to prevent this
20:02:53Araqa TR macro should not affect semantics
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20:20:29Senketsuou shit beer stream already started
20:20:59Senketsuoh wrong channel hue
20:21:10Araqno
20:21:20Araqtell us about the beer ;-)
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20:27:23Senketsuumm, like what ? its a music stream..with a drunk dj and beer opening intermissions
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