adrien changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | OCaml MOOC http://1149.fr/ocaml-mooc | OCaml 4.02.3 announced http://ocaml.org/releases/4.02.html | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml
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<nullcatxxx_> what's the quickest way to determine if a floating point number is -0.0 in OCaml?
<nullcatxxx_> I am thinking to use Int64.bits_of_float
<nullcatxxx_> of string_of_float...
<copy`> 1.0 /. x = -.infinity
<copy`> Just an idea
<nullcatxxx_> cool !
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<Emmanuel`> Hello
<Emmanuel`> is there something similar to Async.Pipe with Lwt?
<Emmanuel`> ie: some kind of pipe with a reader and a writer, where the reader waits for something to be written
<struk|desk> Emmanuel`: I'm more familiar with async pipes but I think Lwt_io.pipe is a good starting point.
<Emmanuel`> ah
<Emmanuel`> afaIk, this creates a Unix pipe
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<Emmanuel`> I'm basically looking for something like Lwt_stream, with a function like "listen", that get fulfilled when a value has been pushed to the stream
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<Enjolras> Emmanuel`: isn't what Lwt_stream does ?
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<Enjolras> reading a stream blocks until there is something to read
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<Emmanuel`> Enjolras: really? I can only find the .get function, that return None is the Stream is empty
<Emmanuel`> (or Some 'a Lwt.t otherwise)
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<Enjolras> Emmanuel`: so, for instance, you can use iter or fold. But there is a single function to block, the name is just really weird. Let me find it
<Enjolras> Emmanuel`: ah, yes, i think it's get :)
<Emmanuel`> hm
<Emmanuel`> val get : 'a t -> 'a option Lwt.t
<Enjolras> iirc, get returns an option not because of try_get, but because the stream can be closed
<Enjolras> and it will return None when the stream has been closed
<Emmanuel`> get st remove and returns the first element of the stream, if any.
<Enjolras> the not blocking version is last_new
<Emmanuel`> hm, let me try
<Enjolras> (i got really confused by this api the first time i tried, and i have to look it up each time i want to use it)
<Emmanuel`> I got even more confused by Async APi
<Enjolras> to push a function to a stream, you have a push function which takes an option. When you push None, it will close the stream
<Emmanuel`> I'm just converting all my half broken Async code to Lwt, it's a million time simpler
<Emmanuel`> oh really?
<Enjolras> and the reader will be returned None, or fail with Empty in case you used next instead of get
<Enjolras> this is handy to terminate the stream and notify the reader
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<Enjolras> i've never used Async honestly, i don't know :)
<Emmanuel`> ok let me try that
<Emmanuel`> thanks for the clarification!
<Emmanuel`> Enjolras: Yes! You're right. Thank you so much
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<Anarchos> Why does the ncurses package in opam rely on pkg-config instead of ncurses-config ?
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<flux> probably an oversight. package-specific configuratoin commands are quite rare.
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<Anarchos> flux: it is not annoying per-se, but on my platform, the ncurses package is compiled without support of pkg-config to generate the .pc files.
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<flux> anarchos, nevertheles, if ncurses-config works just as well, it seems it should be preferred
<flux> personally if I were to write nucrses-bindings, I wouldn't probably even notice there is ncurses-config given I would have used pkg-config :)
<flux> at the very least it should call back to ncurses-config I suppose
<flux> s/call/fall/
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<Anarchos_> flux: not sure : i have ncurses5-config and ncurses6-config, depending on the version installed. The pkg-config solution seems nevertheless more portable.
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<orbifx> hey
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<Kakadu> hello
<orbifx> hey Kakadu, how are things?
<Kakadu> Folks, can you predict any difficulties in creqating PPX deriving-based extension which will generate ImplicitModules : SHOW ?
<Kakadu> orbifx: too much procrastination
<companion_cube> you mean when implicits are merged?
<Kakadu> I already have 4.02.3+implicits compiler
<orbifx> happens Kakadu :P
<companion_cube> then it should be easy, I guess, you just have to patch ppx_deriving.show
<Kakadu> Yeah, I think that it should be kind of straightforward
<Kakadu> maybe I jsut missing something
<zozozo> where should I report ocamlfind bugs ?
<flux> gerd at gerd-stolpmann.de (says http://projects.camlcity.org/projects/findlib.html)
<zozozo> hanks
<flux> though it seems to have a bug tracker as well: https://gitlab.camlcity.org/gerd/lib-findlib/issues (but the former page suggests emailing is the preferable way)
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<Kakadu> So, it seems I can't use two ocamlbuild plugins at the same time. The straightforward solutions seems to copy-paste right lines to my ocamlbuild.ml. Any other ideas?
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<flux> merge them with some thought?-)
<Kakadu> It's just not really obvious why Ocamlbuild_plugin.dispatch should be called only once
<flux> is it not?
<flux> I think doing something like 'dispatch' twice intead of once could cause great trouble.
<Kakadu> Why do you think so?
<Kakadu> Maybe you know some OCamlbuild internals?
<Drup> flux: Except that's a huge and very annoying API problem that should really be solved
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<flux> kakadu, well, if I were to pick any program that has a "dispatch", ie. pass in an event to be dealt with, if I did it twice, curious things would happen
<Kakadu> flux: even if you pass different event in the second time?
<flux> oh, I understood the same event was passed in both times
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<freehck> Hello people. I've just thought that it would be perfect if opam provided me with an information about what package contains a specific module.
<freehck> I've just thought maybe it already exists?
<freehck> I mean when I use linux distros like Debian or Centos (etc.) I have such instruments like "yum whatprovides" or "apt-file search" to find a specific program. But I don't see the same thing for modules in opam.
<freehck> Opam's just looking for packages with similar names, but not for modules... :(
<Kakadu> ubuntu packages are tarballs with specific files in it. Opam installs everything from sources. Does Gentoo has something like apt-file ?
<Drup> ocp-browser --no-opam -I `opam config var containers:lib`
<Drup> (replace "containers" by the package of your choice)
<freehck> Kakadu: Gentoo does have such things.
<freehck> ocp-browser? what is it?
<Drup> It goes with ocp-index
<freehck> Drup: Thank you.
<freehck> Drup: hm... It looks for modules only in installed packages, right?
<Drup> Yes, you need to have it instlaled
<freehck> Drup: hm... well I usually need vice versa - to find the package by a module name...
<Drup> Ah, that's another issue
<zozozo> with the new beta, when building my project with ocamlbuild, I now get a lot of warning 58 (no cmx file), is there an ocamlbuild (or maybe ocamlfind) patch for that ?
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<mrvn> Has anyone using c++ with ocaml considered overloading operator new to allocate custom blocks containing a class?
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<ggole> We can only hope not.
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<kaustuv> Are there common inlinable idioms that are not inlined by the flambda framework?
<mrvn> ggole: why?
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<flux> smooth(er) c++ ocaml interop would be cool.
<ggole> Like all overloading, it makes it less obvious what is going on
<mrvn> { CAMLparam1(arg); CAMLlocal(foo); foo = new Foo(Int_val(arg)); CAMLreturn(foo); }
<flux> well, operator new is overloaded usually with an allocator parameter, isn't it?
<mrvn> flux: can be
<ggole> And you badly break the usual correspondence between new and delete, too
<mrvn> ggole: delete does nothing
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<Anarchos_> what is the purpose of tcflush in opamConsole ?
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<malc_> mrvn: delete runs destructors
<mrvn> I ment the classes operator delete. ocaml frees the memory so it doesn't has to do anything.
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<seangrove> Algebr`: Now I can just hit "play" in Xcode and it opens on my phone - very cool! Now on to the next problem: https://www.dropbox.com/s/gfgedg5nlituumk/Screenshot%202016-03-04%2009.14.11.png?dl=0
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<seangrove> Algebr`: Ah ok, that was simple enough. I was calling "make_string" from obj-c, but hadn't defined the function in OCaml-land
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<seangrove> I'm trying to pass a number from OCaml to C (obj-c, but think it's the same in this case). Passing 0 from OCaml gives me 1 in C, 1 gives me 3, and so on. I suspect this is the 1-bit tag that OCaml uses. How do I convert it, and where is the appropriate place to do so?
<ggole> There's a macro, see the "interfacing with C" segment of the manual
<mrvn> seangrove: e.g. Int_val, Val_int, ...
<mrvn> seangrove: you might want to look into using the CTypes module
<seangrove> mrvn: Ok, so that looks like I should probably write my OCaml code as normal, and then maybe create a module to expose to C that wraps the OCaml code
<seangrove> Oh, Int_val is in C-land. Blah.
<seangrove> Yup, that worked! I'll look into the CTypes module as well, thanks!
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<seangrove> And are there any good examples of dealing with OCaml strings from C-land?
<seangrove> (or invoking C-functions with OCaml-strings from within OCaml)
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<mrvn> seangrove: Unix.write, but again, you might just want to use cytpes
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<mrvn> seangrove: yes
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<Algebr`> yay!!! It works!
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<seangrove> Algebr`: Getting the simulator to work would definitely be a big boon for people. Signing the code in Xcode turned out to be trivial, but I could see people fumbling around with it.
<seangrove> Algebr`: Also, another big ask: If you can try to figure out a hello-world of ocaml/ios/reactnative (given how familiar you are with the js stack, which is terrifying to me), that would be a huge leap for me.
<seangrove> I'd like to try to figure out a way to use e.g. tyxml as a frontend for ReactJS and ReactNative, and start sharing code between them.
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<Drup> seangrove: don't hesitate to ask questions
<seangrove> Drup: Haven't so far ;)
<j0sh> seangrove: i've thought about this, and i think i'd prefer having native ocaml bindings to UIKit (and getting reactivity with React/ReactiveData) rather than going through FB react native. abstractions on top of abstractions on top of abstractions is what makes software slow :(
<Algebr`> Getting the simulator to work will have to wait a few days, I just dropped off my macbook for a stuck . and / keys, once I get the macbook back then I could get it done in an evening. Okay, will get an reactnative example out the door as well.
<Algebr`> and doing that code sharing is totally doable, even easier if reactnative exposes some headers to me
<Algebr`> native ocaml bindings to UIkit is not practical
<Algebr`> UIkit is too huge and the style of uikit is awkward in ocaml
<Drup> j0sh: tyxml is mostly free abstraction
<Algebr`> probably, i think. So easier to pick and choose what parts of UIkit to rip out, and in any case UIKit is just the gui, so best to do the gui in objective c and business logic in OCaml, if any
<j0sh> i've done bindings for a few components in UIKit, it's tedious but doable. taking advantage of reactnative does give you all that for free
<seangrove> j0sh: The state model of RN is worth it, and if you take a look at Om, you can see how abstractions can speed things up (through immutability, etc.)
<seangrove> Managing state in UI apps is incredibly difficult, RN allows you to use much saner alternatives
<Algebr`> +1
<j0sh> seangrove: you can still get reactivity in a similar way with ocaml, it's just an architecture
<Drup> seangrove: j0sh was talking about tyxml+(ocaml)react, which is a similar model
<seangrove> j0sh: Sure, I'm familiar with the potential (coming from the Clojure/Script world), but prefer to place bets differently
<j0sh> i'm confused though. are we talking about taking tyxml and outputting reactnative and using that directly, or taking reactnative and running that through jsoo, then on iOS?
<seangrove> j0sh: I'm not sure :) I suspect the most straightforwad way is through jsoo, but would be amazing to side-step that
<seangrove> Still, interacting with the RN world from ocaml (instead of jsoo) is probably an uphill battle
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<Algebr`> I need time and mountain dew, heh.
<seangrove> Algebr`: I can provide all the Mountain Dew you desire ;)
<seangrove> Can't help with time quite as much...
<seangrove> Algebr`: But that link doesn't address using community RN pckages like ReactMotion, does it?
<seangrove> (have to step away, back in a bit)
<Algebr`> not directly, but does let me move data between ocaml and reactnative
<Algebr`> kl
<j0sh> i figure if you just wanted tyxml to output react native JS, you wouldn't need a cross-compiler at all
<seangrove> (asking before I leave so I don't forget) Does it make sense to provide an iOS backend for cohttp and ocaml-websocket so that they can be used on the devices?
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<j0sh> would the current (lwt? JS?) backends not be enough? but i'm not exactly sure what ocaml is being used for here, whether as a cross-compiler or just a JS emitter
<Algebr`> It will be hard to recompile cohttp because it has many dependencies and those would need to be recompiled as well
<Algebr`> websocket will be easier, but if it uses lwt then again that needs to be recompiled.
<Algebr`> I haven't looked into that but clearly a big need
<j0sh> does opam work with a cross-compiled ocaml? would be interesting to see if lwt, etc could be built
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<j0sh> iOS is basically unix, so it should be straightforward to support lwt along with everything else (a few tweaks might be necessary for the C parts, but I'd be surprised if it were much)
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<Drup> Algebr`: don't your opam switch take of those things easily ? I though that was the point
<Algebr`> j0sh: yes, I expect for lwt to work would need small changes to C code, if any
<Algebr`> Drup: yes, that's the point, but need to add stuff to it
<Algebr`> starting point was gonna be yojson
<j0sh> Algebr`: awesome
<Drup> Algebr`: you mean you need to convert package manually ? that's not good
<Algebr`> maybe, maybe not, haven't spent too much effort on it but in principle anything that is pure OCaml should be fine
<Algebr`> j0sh: and as you see the Unix module amazingly works out the box
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<Kakadu> Oh, js_of_ocaml ppx generated scary code
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<Kakadu> https://paste.in.ua/1426/raw/ Some weird error
<Kakadu> What could be wrong in line xml##_open(Js.string "GET", url, Js._false); ?
* Kakadu is trying to rewrite jsoo toplevel from Camlp4-based syntax extension to new PPX one and also to add some ocamlbuild instead of Makefile
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<Drup> kakadu: use camlp4toppx, or look at the documentation, this should be explained
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<Kakadu> aaaaaaaaaaaaaaaaaaaaaah
<Kakadu> I don't need a tuple any more
<Kakadu> good!
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<aantron> trying to set up vim with merlin, added :set rtp+=<SHARE_DIR>/ocamlmerlin/vim, where <SHARE_DIR> is `opam config var share` to ~/.vimrc, typing Ctrl+X Ctrl+O in insertion mode in vim, get Omni completion (^O^N^P) Pattern not found. what am i missing?
<aantron> opam list merlin shows merlin 2.3.1 installed
<aantron> vim is 7.3 distributed by apple
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<smondet_> aantron: I would test the merlin setup with <localleader>t instead of completion because it's more reliable (also at the vim level)
<def`> aantron: share the ouput of :scriptnames if it is still not working (and :set omnifunc? )
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<Algebr`> kakadu: yes, white space now
<aantron> thanks smondet_, def`, it seems to be working. the problem was the instructions use a path component "ocamlmerlin" while current merlin uses "merlin" for that directory
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<aantron> def`: you work on merlin, yes?
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<Algebr`> def is a young merlin
<Algebr`> I can include that fix for tomorrow as well if you don't feel like hassle of PR aantron
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<aantron> whats happening tomorrow?
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<aantron> i mainly was wondering if def` here is def-lkb on GH, to inquire about https://github.com/aantron/namespaces/issues/3