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   January 4, 2019
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[00:01:31] <Ameisen> Well, if you look at other languages like C# or Java, you can certainly have circular dependencies between class files (which are effectively similar to modules in that regard)
[00:01:37] <Ameisen> though they don't need to know things like sizes
[00:02:04] <Ameisen> but it also implies that you have to build modules in dependency order, which limits parallelism of the build
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[00:03:30] <Ameisen> I did also notice when trying to use modules in Visual C++ that when I linked a static library that was designed off of modules, and tried to instantiate a template class from a module import that had a 'new' in there, it threw a rather long missing symbol error for something around std::align_val_t
[00:04:14] <Ameisen> It's unclear what's supposed to work.
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[02:43:33] <ville> introduction of modules will be fun. everything will be broken for a year.
[02:46:08] <Ameisen> "a year".
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[04:04:09] <Ameisen> Have there been any proposals to make enumerators 'better' in C++?
[04:04:15] <Ameisen> that is, give them implicit string conversions or whatnot
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[04:05:55] <fattest> Hi all, I made a simple Boost Graph, https://wandbox.org/permlink/gtIKrJ8awiUAJxtS. But when I try to print my graph, I'm getting "no matching function for call to ‘get(boost::vertex_index_t,..." error. Any help would only be appreciated.
[04:06:15] <kalven> Ameisen: iirc there's a pretty comprehensive reflection proposal that includes that (among a lot of other things)
[04:06:41] <Ameisen> presumably nothing that's going to have any chance at all of being in C++20
[04:06:52] <kalven> don't think so
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[04:08:11] <Ameisen> I kind of wish there were even compiler extensions/__builtins to do it
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[04:31:14] <INSANU> hey guys, I want to build a real time face recognition app, what do you guys recommend? dlib? and what method would be the best one?
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[05:10:37] <ViralTaco> Hi
[05:11:07] <ViralTaco> Could you guys tell me what you think about my code: https://github.com/ViralTaco/Toast
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[05:22:04] <IceN9ne> const std::string& command = argv[1]; <--- why a reference?
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[05:36:39] <zap0> if argc==1 ==2 ==3.. Y U NO switch ( argc )
[05:37:20] <zap0> and or <-- do they work on all platforms?
[05:37:52] <Ameisen> I'm a little curious about all those string constants that are in std::strings rather than constexpr char arrays or string_views
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[05:38:54] <Ameisen> "answer == "yes" or answer == "Yes")"
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[05:38:59] <Ameisen> since when is "or" a thing
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[05:39:18] <Ameisen> also, your dialog specifies you want 'y' or 'n'
[05:39:27] <Ameisen> then you reject 'y', requiring 'yes'
[05:39:30] <Ameisen> but accept 'Yes'
[05:39:54] <Ameisen> also not usually a good reason to else if off of an if that always returns
[05:40:43] <zap0> and or has beena thing for a long time, just not very popular
[05:42:15] <immibis> the real question is why it's in the base language and not a set of #defines like in C
[05:42:19] <zap0> Ameisen https://en.cppreference.com/w/cpp/keyword
[05:42:31] <Ameisen> but why
[05:43:57] <zap0> compl i have never seen
[05:44:26] <Ameisen> is_user_sure is marked as noexcept but can technically throw.
[05:45:34] <Ameisen> And there are ways to implement switch statements with strings.
[05:45:40] <Ameisen> thanks to our friend Mr. Constexpr
[05:47:42] <zap0> mrs constexpr is a contridiction ;)
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[05:48:14] <zap0> UB is probably female ;)
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[06:26:08] <ViralTaco> IceN9ne indeed… Why a ref? I guess because dubious use of ref isn't worth a compiler warning
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[06:28:44] <ViralTaco> And I use "and" and "or" because it's hard to confuse them with bitwise operator
[06:29:05] <ViralTaco> binary operators?
[06:29:09] <ViralTaco> idk I'm tired
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[06:33:14] <ViralTaco> also the y/n dialog… I've seen it done like that before and I like it because it made no sense
[06:33:19] <ViralTaco> Thanks guys :)
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[06:53:24] <escanor> Hello all i am working on running cpp model in tensorflow cpp
[06:53:45] <escanor> Can anyone tell me the logic behind from line 72
[06:53:52] <escanor> https://github.com/HackersSpirit/tensorflow-qtcreator-cppApi/blob/master/main.cpp
[06:54:02] <escanor> Thanks a lot in advance
[06:57:58] <ViralTaco> // copying the data into the corresponding tensor
[06:58:11] <ViralTaco> that's line 72
[06:58:17] <ViralTaco> it's a comment
[07:02:22] <ViralTaco> following is just a loop that defines some const pointer to floats then assigning values into that thing `tensorflow::Tensor input_tensor(tensorflow::DT_FLOAT, tensorflow::TensorShape({1,height,width,depth}));`
[07:04:11] <escanor> ViralTaco: Thanks
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[07:04:23] <escanor> Actually i was facing issue
[07:04:27] <FishPencil> How should I parse command line arguments? I'm using stoi(argv[i + 1]) right now
[07:05:03] <escanor> If i passed BGR to RGB in tensor map the prediction result changes. Is there a link between them
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[07:05:19] <escanor> ViralTaco: The order input must be given to tensor map
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[07:05:58] <ViralTaco> i couldn't say honestly
[07:06:05] <ViralTaco> I just looked at that loop
[07:06:23] <ViralTaco> FishPencil can you show the code pls
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[07:09:36] <FishPencil> ViralTaco: I'm just using this right now: https://ideone.com/fork/8OidqT
[07:09:58] <FishPencil> I don't like that I have to use the ia or I get a compiler warning
[07:11:15] <FishPencil> I'm mainly curious how this is normally done
[07:11:32] <escanor> ViralTaco: Thanks
[07:11:47] <ViralTaco> I mean that looks fine to me
[07:12:13] <ViralTaco> well you can have a `catch (std::invalid_argument)` I think
[07:12:58] <ViralTaco> or `catch ([[maybe_unsused]] const std::invalid_argument& ia)`
[07:13:22] <FishPencil> Ah, such a simple fix
[07:13:23] <FishPencil> thank you
[07:13:42] <FishPencil> I guess I'll stick with that then
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[07:17:29] <ViralTaco> I mean this: https://ideone.com/Yejp53
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[07:17:43] <ViralTaco> Not much better just a bit of housekeeping
[07:17:56] <ViralTaco> You could use the c function atoi :/
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[07:18:04] <FishPencil> Going to avoid that
[07:18:08] <FishPencil> This will work
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[07:19:02] <ViralTaco> You don't need to flush the stream with std::cerr btw it's not buffered afaik
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[10:19:39] <amosbird> how is it possible that a reference of an array got out of sync from its source?
[10:19:43] <amosbird> size_t (&global_offset)[HISTOGRAM_SIZE];
[10:19:47] <amosbird> is that a correct reference?
[10:22:50] <s_frit> i have never used that, but it appears to be correct, looking at: https://stackoverflow.com/questions/10007986/c-pass-an-array-by-reference
[10:24:21] <amosbird> oh, i see
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[10:27:06] <immibis> a reference cannot "get out of sync with its source"
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[11:03:59] <amosbird> does standard guarantee that elements in array : "EdgeRow local_data[HISTOGRAM_SIZE][LOCAL_CACHE_SIZE];" will have alignment to the sizeof(EdgeRow)?
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[11:26:18] <s_frit> amosbird: no, they'll have alignment to alignof(EdgeRow)
[11:26:47] <amosbird> what's the rule of alignof(EdgeRow)?
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[11:27:58] <s_frit> alignof(EdgeRow) is greater than or equal to the alignment of any subobject of EdgeRow
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[11:28:32] <s_frit> *any -> every
[11:29:08] <s_frit> assuming that EdgeRow doesn't have an explicit alignment specifier
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[11:30:15] <s_frit> amosbird, given your persistent interest in details, you should learn to read the standard
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[12:11:11] <amosbird> hmm, how can I fix this https://godbolt.org/z/x6T7OC
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[12:28:30] <nblade42> amosbird: Do you mean make_tuple(...) instead of make_tuple<...>
[12:29:28] <amosbird> ok.., but that doesn't work either
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[12:32:10] <purnifire> test
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[12:33:41] <nblade42> amosbird: http://coliru.stacked-crooked.com/a/e21b890c03a4f2e7
[12:35:35] <nblade42> https://godbolt.org/z/3TUDi8
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[12:45:47] <amosbird> hmmmmm
[12:45:48] <amosbird> https://godbolt.org/z/QMSkdC
[12:45:53] <amosbird> g++ fails while clang works
[12:46:03] <amosbird> who is correct?
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[14:41:14] <Forsaken87> hey. can someone give me a hint how to properly handle program interruption? I'm using the boost library with the main thread and one extra thread and tried using the thread_interrupted exception together with singal handlers (SIGSTOP, SIGTERM and SIGINT). Neither triggers when sending a stop signal.
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[14:47:07] <s_frit> what makes you think thread_interrupted will be thrown when a signal is received?
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[14:47:46] <Forsaken87> i expected the signal handler to be triggered which the call thread.interrupt()
[14:48:13] <Forsaken87> then*
[14:48:45] <s_frit> is thread.interrupt() safe to call from a signal handler?
[14:49:04] <s_frit> are you saying that the signal handler is not being called?
[14:49:08] <Forsaken87> yeah
[14:49:29] <Forsaken87> i set breakpoint to all registered singal handlers and not even those are triggering
[14:49:36] <s_frit> i seriously doube that you can call thread.interrupt() from a signal handler, unless you have documentation that says otherwise
[14:49:43] <s_frit> *doubt
[14:50:48] <s_frit> what API are you using to register the signal handlers? POSIX or some boost thing?
[14:51:06] <Forsaken87> csignal (thats POSIX right?)
[14:51:48] <Forsaken87> I'll give the boost implementation a shot
[14:52:11] <s_frit> csignal seems to be some ISO C thing that i'm not familiar with
[14:52:38] <s_frit> are you calling signal() from the main thread?
[14:53:35] <s_frit> "Notice that not all running environments are required to generate automatic signals, not even in the specific cases described above" http://www.cplusplus.com/reference/csignal/signal/
[14:54:54] <s_frit> this says to use sigaction: http://man7.org/linux/man-pages/man2/signal.2.html
[14:55:25] <s_frit> "The signals SIGKILL and SIGSTOP cannot be caught or ignored."
[14:56:08] <s_frit> ^^^ that explains why you're not getting anything when sending a stop signal
[14:57:50] <Forsaken87> What would be a proper way to gracefully exit when the operating system wants to end the application?
[14:58:57] <ville> there isn't one. you can be killed violently enough that the process just disappears.
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[15:00:43] <cbreak> Forsaken87: you can return from main
[15:00:55] <cbreak> that's the standard way to exit gracefully
[15:02:30] <Forsaken87> cbreak: Yes, but I am running my program as a service. There is no way to press ctrl+c, close a main window or something like that
[15:02:51] <s_frit> Forsaken87: on what OS?
[15:03:00] <Forsaken87> linux
[15:03:15] <cbreak> Forsaken87: so, you can still return from main
[15:03:28] <cbreak> when someone systemctl stops you
[15:03:58] <cbreak> just register a sigterm sig handler and make it set some flag that causes you to return or something similar
[15:03:59] <Forsaken87> cbreak: yes, thats the plan. but how does my program gets informed systemctl wants to stop it
[15:04:00] <s_frit> you should get SIGTERM not SIGSTOP
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[15:04:20] <s_frit> https://stackoverflow.com/questions/42978358/how-systemd-stop-command-actually-works
[15:04:21] <Forsaken87> thats exactly where my questions started
[15:04:39] <s_frit> no, you said nothing triggers when sending the stop signal
[15:04:55] <Forsaken87> "with singal handlers (SIGSTOP, SIGTERM and SIGINT)"
[15:05:03] <s_frit> and you checked all of them?
[15:05:05] <Forsaken87> yes
[15:05:33] <s_frit> that's not what you said
[15:06:20] <s_frit> i'm not entirely sure you should depend on a debugger working correctly in a signal handler. but i defer to the experts on that
[15:06:25] <Forsaken87> sure, I just quoted it again.
[15:06:53] <s_frit> well lets stick to whether SIGTERM gets caught, because that's the one you're interested in
[15:07:31] <s_frit> if it were me, i'd set an atomic flag from the signal handler, and check it in a watchdog thread
[15:08:33] <s_frit> maybe you can use sem_post from the signal handler to wake the watchdog thread: https://stackoverflow.com/questions/34931326/c-signal-handling-and-semaphores
[15:09:21] <s_frit> https://www.systutorials.com/docs/linux/man/3-sem_post/
[15:09:32] <s_frit> "sem_post() is async-signal-safe: it may be safely called within a signal handler. "
[15:09:51] <s_frit> keep in mind that most things, including IO are not async signal safe
[15:10:15] <s_frit> which is why i said that I doubt that thread.iterrupt() is, unless documented otherwise
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[15:11:35] <Forsaken87> s_frit: I currently have a global boolean (appExit) which I check periodically in my main loop
[15:11:57] <Forsaken87> and in case of exceptions or signals I simply set it to true
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[15:14:33] <dadabidet> can I put default argument of method in the prototype OR in the definition?
[15:14:44] <Forsaken87> I'll simply try the boost implementation now, maybe I have more luck with that.
[15:14:47] <dadabidet> I mean only one of those 2 but not both
[15:18:03] <cbreak> Forsaken87: you're not allowed to do that, use an atomic<bool>
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[15:18:10] <cbreak> or some other safe mechanism for signaling
[15:18:34] <Forsaken87> cbreak: okay, thanks
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[15:26:15] <s_frit> dadabidet: as far as i know the default value should be in the declaration (prototype)
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[15:26:41] <dadabidet> yeah I tried, I thought it was possible to put it in the definition but that was wrong
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[15:32:33] <dadabidet> https://ideone.com/E7os0v what do think about this?
[15:32:56] <dadabidet> yaw is rotating around the y axis, pitch around the x axis
[15:33:05] <dadabidet> y being up, x being left
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[15:33:20] <dadabidet> sorry wrong channel
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[15:55:39] <ville> anyone here happened to have been following the latest papers about deformable/destructable terrain in 3d games? what are the current solutions? haven't looked at any paper like that in 10+ years so i've no clue.
[15:58:06] * veverak wants to know too
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[16:01:00] <shake> ville: I think the latest paper I read is also a bit dated but maybe still relevant: http://www.dice.se/wp-content/uploads/2014/12/Chapter5-Andersson-Terrain_Rendering_in_Frostbite.pdf
[16:01:44] <Forsaken87> I got it working with the boost signal handling and an atomic<bool>. Thanks again for the help
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[16:05:17] <ville> shake: ok looks interesting after a very fast overview, but also doesn't quite seem like it's deformable/destructable? they've a destruction mask but that's used to splat a graphical effect more than actually deform it?
[16:06:44] <shake> Well for deformation they seem to be just updating the heightfield texture
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[16:07:54] <quarterback> Anybody interested in a C++ video software development engineer job in Vancouver,WA, Usa? I can send you a email with its description and contact person.
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[16:08:31] <shake> You could just render-to-texture some feathered shape into it with add blending I guess
[16:10:39] <ville> shake: the screenshot seemed rather "bland", but i guess it wasn't meant to demonstrate the terrain deform and just that a burnt ground texture was splatted
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[16:12:40] <shake> Hehe, yes. That's true. But some of them still look kind of impressive - given that this was like 5 years ago.
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[16:13:59] <shake> As for destructible terrain I am not sure how far you want to take it anyway. Could make a game unplayable with people falling down and being stuck in huge craters ;)
[16:14:19] <quarterback> Guess nobody wants to goto that shitty place.
[16:16:25] <ville> shake: yes there are gameplay concerns and what i had in mind i probably don't want more than "well behaved" explosion craters. no weird tunneling by setting of series of explosions
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[16:18:48] <shake> ville: This also looks kind of interesting - https://www.researchgate.net/publication/292995143_Drift-Diffusion_Based_Real-Time_Dynamic_Terrain_Deformation
[16:19:21] <shake> I once tried something similar for a multi-touch "sandbox". It felt more like mud though
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[16:36:20] <rpav> quarterback: vancouver is sleepy, but remind people portland is literally right next door ;)
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[16:41:01] <solidfox> hello, when i run my program, start a game, and quit, i get a segfault, and i'm not sure why. the core dump says its happening when game and block are destructed. here is the code: https://github.com/ericshawlinux/tetris-clone2/blob/master/include/block.h https://github.com/ericshawlinux/tetris-clone2/blob/master/src/block.cpp
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[16:46:37] <ville> shake: run it under a debugger and get more insight
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[16:50:02] <solidfox> ville: i tried that but it says its having a segfault in free()
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[16:50:35] <Aleric> solidfox: try a 'make clean'
[16:50:39] <Aleric> and rebuild
[16:51:18] <solidfox> Aleric: yeah that worked
[16:51:23] <Aleric> yay
[16:51:59] <fooobarrr> "worked"
[16:52:14] <solidfox> fooobarrr: no more segfauly
[16:52:32] <solidfox> LadyElusive: hey long time no see
[16:52:33] <fooobarrr> yes but it could be some weird state... you'll have to run it a few times
[16:52:44] <solidfox> fooobarrr: ah could be
[16:52:49] <Aleric> no it isn't.
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[16:52:58] <fooobarrr> i didn't read the code
[16:53:01] <Aleric> I ran it through valgrind and it's clean :p
[16:53:04] <fooobarrr> ah ok
[16:53:05] <fooobarrr> :D
[16:53:11] <fooobarrr> well valgrind doesn't find all bugs
[16:53:18] <fooobarrr> but memory-related things it should
[16:53:31] <fooobarrr> run the clang sanitizers on it and i'll be fully satisfied
[16:54:00] <fooobarrr> cmake suggestion is good too
[16:54:18] <fooobarrr> only time i don't use cmake is when there are ~2 files with 0 dependencies
[16:54:53] <Aleric> solidfox: it needs a way to quickly drop the piece.. ie, with the space bar :p
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[16:57:01] <solidfox> Aleric: like instantly? oh that'd be cool. you can open an issue there on github if you like, and i'll do that later :P
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[16:57:46] <LadyElusive> hi solidfox. where do i know you from?
[16:57:58] <LadyElusive> i'm thinking gentoo?
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[16:58:11] <solidfox> LadyElusive: you probably don't remember me, but from #anime
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[16:58:39] <LadyElusive> big oof
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[16:59:21] <solidfox> oh, sorry. yeah it was #gentoo
[16:59:23] <solidfox> haha
[16:59:59] <solidfox> i almost switched back to gentoo recently, but i just couldnt bring myself to do it
[17:00:05] <solidfox> its such a big time committment
[17:00:44] <LadyElusive> are we allowed to talk off-topic in here?
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[17:08:01] <pulse> LadyElusive, there's ##c++-social
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[17:10:20] <LadyElusive> thank you
[17:10:47] <LadyElusive> there is also PMs
[17:11:33] <pulse> what is a PM
[17:11:42] <Aleric> private msg
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[17:12:09] <Aleric> I need someone to tell me to go buy food.
[17:12:15] <LadyElusive> go buy food
[17:12:21] <Aleric> ok, thanks.
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[17:15:21] <pulse> buy lots of green vegetables
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[18:09:03] <markand> hello there
[18:09:16] <markand> wasn't there a syntax to do selective include of std literals?
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[18:15:21] <solidfox> like uint?
[18:16:08] <solidfox> #include <cstdint> possibly
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[18:18:39] <solidfox> oh literals
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[18:20:47] <markand> like 50ms
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[18:21:06] <markand> one usually do using namespace std::chrono_literals;
[18:21:58] <solidfox> markand: yes you can also do using std::literals or std::literals:chrono_literals https://en.cppreference.com/w/cpp/symbol_index/chrono_literals
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[18:22:35] <solidfox> "if a programmer uses using namespace std::chrono; to gain access to the classes in the chrono library, the corresponding literal operators become visible as well."
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[18:24:03] <solidfox> heh, these are pretty nifty
[18:24:30] <solidfox> i was using std::chrono::seconds(1)
[18:26:14] <markand> :)
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[18:29:01] <Aleric> pulse: Oh, I missed that :(... but well, I can't cook anyway - so the choice is limited.
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[18:29:24] <pulse> cooking is a lot like programming
[18:29:31] <pulse> pretty algorithmic if you ask me
[18:29:39] <pulse> apply the same principles and you'll be ok :p
[18:29:44] <Aleric> haha
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[18:44:07] <ville> markand: using std::chrono_literals::operator ""ms;
[18:44:27] <ville> markand: that's about as "selective" you can get
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[19:06:04] <Zunino> I'm using flex and bison for the first time and have a question regarding semantic error handling. I have a toy language that allows for user type declarations and I want to signal an error if the same type is declared twice.
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[19:06:38] <Zunino> Is there a "right" way to do it? Should I use yyerror() for that?
[19:07:42] <Zunino> E.g. decl foo; decl bar; decl foo; => Should flag the second declaration of 'foo' as duplicate.
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[20:03:24] <chaosss> I have an enum class with underlying type int. I want to overload the ++ operator. This works if placed in the header file - but I get in trouble once this header is included multiple times. How do I split this overload into header and source file?
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[20:06:12] <bayoubengal> chaosss: did you mark the function inline?
[20:06:21] <ville> chaosss: there's nothing particular about the case. it works the same as any other function
[20:06:31] <sonOfRa> Are you using proper include guards?
[20:06:59] <ville> chaosss: so do you understand how it would work if you were writing a normal non-member function?
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[20:08:54] <chaosss> ville: yes I do, maybe I have a different problem - need to check that.
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[20:10:32] <chaosss> yeah, ..., I didn't overload << operator and thus misinterpreted the compiler output :D
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[22:55:03] <ville> have to say i do dislike any form of network programming, but asio is just something on its own due to its documentation
[22:57:28] <rpav> hum, anyone seen/know of any kind of fast declarative/rules-based C++ framework
[22:57:56] <ville> for what?
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[22:58:16] <rpav> i'm not entirely sure how to describe it, not looking for a *solver*, but more like an easy-to-analyze set of declarative rules and dependencies
[22:58:38] <rpav> i want something better for ECS systems than just a bunch of arbitrary conditionals
[22:58:39] <ville> task dependencies?
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[22:59:28] <rpav> no rules more like, you take a bunch of information (raycasts, position, velocities, etc), and then specify rules that determine the current state of the system
[23:00:01] <rpav> like "grounded = ray N hits, angle is a0..a1, ..."
[23:00:12] <rpav> but such that it's easy to analyze and dump
[23:00:45] <rpav> like for any given frame, it should be easy to tell why a given thing is in a given state, record what happened, etc
[23:01:35] <rpav> dependencies yes but this isn't about concurrency or whatever per se
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[23:02:13] <rpav> more like a spreadsheet i guess, which gives me an idea how i might implement it if theres' nothing else
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[23:06:50] <ville> definetly going to have to write something your self here i would presume.
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[23:13:29] <rpav> yeah i may have to play around with something
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[23:18:38] <ville> sounds like you need some kind of history of function calls or at least events per-frame so you can see why, say, rigid body's input force is x,y,z or something like that
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[23:19:35] <ville> now if only c++ had ability to inject pre- and post conditios for functions it'd be pretty easy
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[23:34:22] <ville> asio interface is just silly. who came up with this
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   January 4, 2019
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