flux changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | OCaml MOOC http://1149.fr/ocaml-mooc | OCaml 4.03.0 announced http://ocaml.org/releases/4.03.html | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml
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<chindy> i am trying to write a parser for simple math expressions using menhir http://pastebin.com/UCptucnf . But compiling leads to this error:
<chindy> (Main.cmi already seen in [ Parser.mli; Parser.cmi; Lexer.cmi; Main.cmi;
<chindy> Main.cmx; Main.native ])
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<rgrinberg> gasche: is this ok? https://github.com/ocaml/ocamlbuild/pull/95
<rgrinberg> I assumed you use merlin too.
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<gasche> rgrinberg: the dirty truth is that, given that I spend most of my OCaml time these days hacking the OCaml compiler (and playing between many switches), I kind of lost the habit of using Merlin on compiler-related projects
<gasche> but thanks, it definitely makes sense for ocamlbuild
<xvw_> Yo, is there a way to add a structure on the begining of a file when i writte a PPX?
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<rgrinberg> gasche: I see. I hope one day merlin will work with the compiler out of the box (if it's even possible).
<rgrinberg> Also, does manual.adoc get rendered somewhere? I'd love to see how it looks
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<gasche> rgrinberg: the github repo renders it
<gasche> (there is a PR in the old manual repository for Makefile rules for rendering but they're a bit complex and I haven't had time to look at them)
<gasche> I think that indeed Merlin could work on the compiler, but it requires synchronized Merlin and compiler changes, and so far it has not happened
<gasche> (witness the small delay for 4.03 support)
<gasche> I think what's really needed is a regular compiler contributor motivated to bugger the Merlin people when it breaks
<gasche> (and so far I did not have the courage to be that person)
<Algebr```> what is the proper syntax for this? class type foo ?thing () = object end
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<gasche> Algebr`` class types do not take arguments
<gasche> so it would be
<gasche> class foo ?thing () = object end
<gasche> class foo_ty = object end
<gasche> class foo ?thing () : foo_ty = object end
<gasche> hm
<gasche> I meant
<gasche> class type foo_ty = object end
<gasche> class foo ?thing () : foo_ty = object end
<gasche> sorry
<Algebr```> gasche: wait, which one is the right one?
<Algebr```> ah, you mean explcitly having to do the : in the actual class
<gasche> you don't actually have to
<gasche> but I'm just saying, class type don't take arguments, they just classify objects
<Algebr```> why aren't the arguments taken into account for a class type then?
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<gasche> it wouldn't really make sense, I think
<mrvn> arguments to classes don't realy make sense
<Algebr```> ahhh
<gasche> I think of a class declaration as "it takes arguments and then returns an object of some class type"
<mrvn> just syntactic suggar to avoid having to write class types
<mrvn> gasche: fun x y z -> class foo = object ... end
<Algebr```> right right.
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<Drup> gasche: merlin works decently on the compiler itself
<Algebr```> created a class in a module and then did an include on the module, now getting unbound class
<Algebr```> sigh
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<Algebr```> gasche: why do classes have to reveal instance variables in signatures?
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<mrvn> Algebr```: inheritance?
<Algebr```> I don't see why inheritance matters here, child will override parent anyway
<Algebr```> yes! first real usage of recursive modules
<mrvn> so the child knows what variables are there
<Algebr```> ahhhh darn
<mrvn> # class base = object val x = 1 end class foo = object inherit base method foo = x end;;
<mrvn> class base : object val x : int end
<mrvn> class foo : object val x : int method foo : int end
<Algebr```> oh wow, found an actual place where merlin isn't catching a syntax mistake
<Algebr```> def`:
<Algebr```> def`: I put it on a branch so can check out later
<Algebr```> this oasis driven warning is annoying, any way to fix it? Configuration "true: quiet, debug, tests", line 1, characters 20-25: Warning: the tag "tests" is not used in any flag or dependency declaration,
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<Algebr```> there's no `include moduleSignature` kind of syntax available?
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<struk|desk> Algebr```: what recursive modules are you speaking of?
<Algebr```> module rec Foo
<struk|desk> Algebr```: I mean, what was your "good" use case for it?
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<Algebr```> record in one module needed type of class in another, vice versa
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<struk|desk> is it specifically because you're using classes, then?
<Algebr```> probably since type foo and bar = object end doesn't work
<struk|desk> yeah
<Algebr```> actually ended up using 3 modules together recursively
<struk|desk> exciting! living on the wild side, I see.
<mrvn> it sucks that you can't have recursive classes or recursive with mixed branches. The recursive module syntax is a pain.
<Algebr```> incredible pain
<mrvn> tell more
<struk|desk> ppx_import could be modded to make it less annoying
<Algebr```> also using the ability that module sig of only type definitions gets a name of the same of the module
<Algebr```> thankfully it played nicely with mli, only had to expose 2 of the 3 rec modules in the mli
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<mrvn> Algebr```: screw that. just include the 2 (3) modules after declaring them to get it all into one namespace
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<Algebr```> yea, also played with that too
<Algebr```> actually turned out as nice as I wanted it to be
<mrvn> actually, just thinking through it again. How do you write the mli file without the recursive module?
<Algebr```> I only included 2 of the 3
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<zRecursive> What does "Error: Unbound module Foo" mean ?
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<mrvn> With the control flow integrity stuff how do I make my compiler work that doesn't use a stack at all?
<mrvn> ups, ewin
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<Enjolras> zRecursive: it means you are trying to use a module named Foo but no module definition for module Foo is visible in the current scope
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<Enjolras> it is the same error message for values to "unbound" means "no definition has been bound to this name"
<Enjolras> in other languages it would be something like "but module Foo is undefined"
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<struk|desk> zRecursive: I sometimes do that by stupidly writing this: "module Foo = struct type t let f (t:Foo.t) = ... end "
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<zRecursive> thanks all! i need to think it for a while. Because the project works very well under 3.1.2 before.
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<johnelse> Hello - I'm having some trouble with js_of_ocaml - see https://github.com/johnelse/js_of_ocaml-experiments/blob/master/src/script.ml#L5
<johnelse> The compiler complains about the coercion, that element is not a subtype of node
<johnelse> Is Js.Unsafe.coerce my only option here?
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<johnelse> ah...Dom.appendChild works. would be nice to know why my manual coercion doesn't work though.
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<orbitz> Anyone have experience with ocaml dtrace? Specificlaly how to get useful values out of ustack()?
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<aantron> johnelse: try coercing to Dom.node Js.t, not just Dom.node
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<Algebr```> grr, modules can't start with _?
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<malc_> Algebr```: yes.. capitalized-indent (module-path) has to start with an [A-Z]
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<Algebr```> Okay..what? Undefined recursive module
<Algebr```> but it is defined
<Algebr```> oh crap indeed it wasn't.
<Algebr```> How did this even compile though??
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<orbitz> Hello, I have what I think is a common problem. I have a type 'a t that is a record, and there are some values for it which dont' depend on 'a at all, and I'd like to do: let foo = { this = `That } in a type safe way. is that possible? My problem right now, if I understand the error, is that the type of foo doesn't match the type of the function where I am using it.
<orbitz> I tried let foo 'a. 'a t = { this = `That } but that didn't work
<orbitz> Effectively I' trying to avoid allocating a struct all the time in a case where it's static
<mrvn> orbitz: { t with this = `That }?
<mrvn> or do you want to say that { this = `That } is polymorphic like [] works for any list?
<orbitz> mrvn: the latter
<orbitz> Basically I'm caching a common value I'll have to avoid an allocation. And I'm just curious.
<mrvn> well, first thing: let foo () = { this = `That }, then each invokation allocates a new one wich can be any type.
<mrvn> the other thing is to declate the record as +'a t
<mrvn> s/declate/declare/
<orbitz> THe function thign I want to avoid since I'm trying to avoid the allocation
<orbitz> what does the + annotation do? I believe it has to do with subtyping?
<mrvn> orbitz: the you have values that can be any 'a type like [].
<orbitz> right
<mrvn> orbitz: can't explain it right but that + is to tell the compiler abvout your issue for cases where it doesn't/can't infer that on its own. Check the docs about it.
<orbitz> arghh you know what. This is actually a typo on my part!
<orbitz> The obvious solution works fine, I'm just a bit daft.
<mrvn> hehe
<orbitz> of course :)
<orbitz> thanks mrvn
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<mrvn> we live to serve (as a sounding board)
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<mrvn> the NSA wants it's root kit to run somewhere
<mrvn> ups
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<seliopou> rgrinberg did you port opium to lwt? :P
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<jnavila> Hi, how can I use oUnit to test functions inside the body of my module, but without declaring the tested function in the interface of that module ? I'm using oasis and that does not seem to be possible
<mrvn> can't
<jnavila> :/
<mrvn> would be nice to have a "#ifdef enable_testing" for that
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<apache2> isn't there a ppx for doing something like that?
<jnavila> Yep. In fact, I'm not even sure I'm handling this correctly. To be able to test some functions, I had to move them from the main file of the executable to another and declare a module on it.
<apache2> that sounds like a good thing
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<apache2> unless you're making something very specific, you generally want to put as much of your functional code in smaller units / "libraries" to allow other tools to use the same functions
<jnavila> OK. No "best practice" solution, then.
<mrvn> write tests that use the public api
<jnavila> Ah, maybe I should to create internal API ;-)
<rgrinberg> seliopou: a while ago
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<apache2> jnavila: best practice is to have an internal API :)
<mrvn> I've seen people have all the unit tests as part of the module and just expose a single test function that runs all the internal tests
<jnavila> Ok, I'll try both approaches, thanks both.
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<Algebr```> why doesn't include Some_module_sig work in an mli
<Algebr```> and why can't module types be recursive?
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<Algebr```> def`: and merlin doesn't complain about lower case word in module type foo = sig end
<octachron> Algebr```, including a module type should work?
<octachron> Algebr```, lower case word are perfectly valid OCaml for module type
<Algebr```> what
<Algebr```> wow
<mrvn> no cycles allowed except via recursive modules.
<Algebr```> including a module type does work but I don't want that
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<Algebr```> I want to do an include of a module Foo : sig end
<octachron> include (module type of Foo) ?
<Algebr```> !!!!
<Algebr```> AWESOME!
<Algebr```> explain explain!!
<Algebr```> the of keyword being used this way is odd to me
<octachron> (module type of M) computes the module type of a given module, with few caveat (at least I remember several mantis ticket on this construction)
<Algebr```> so it makes it on the fly
<octachron> well, a module type is still a type so fully computed at compilation time
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<mrvn> but M is a module and you want the type OF M.
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<struk|desk> how do you return an array type with ctypes when you don't know the size of the array in advance? eg. foreign "foo" (t @-> returning (array N bool) <-- what if I don't know N.
<mrvn> C has no arrays, only pointers. return one
<struk|desk> actually now that you mention it the C++ api I'm wrapping actually returns some special array object (which is as you guessed as pointer), so my question was ill conceived. thanks
<struk|desk> *is a pointer
<mrvn> class with pointer and length? Or how do you get the size?
<struk|desk> it has public methods
<struk|desk> I am will just wrap it the same way I am wrapping the apis other objects
<mrvn> so more like an std::vector then.
<mrvn> I have similar things in Qt5. I always wonder at what point it would make sense to extract all the data and put it into an ocaml type instead of keeping it wraped.
<struk|desk> thats an interesting..like a runtime meta data thing?
<struk|desk> I like qt5, actually
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<struk|desk> IF I had to rewrite that api in c++ I would use qt5 as a base
<mrvn> Things like a Color. Would make sense to copy it into uint32. Or a Pixmap into an int32 bigarray.
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<mrvn> struk|desk: I would love to have Qt5 reimplemented using c++15 (std::move, std::shared_ptr, ...)
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<struk|desk> mrvn: does it makes its containers/strings/streams and whatnot injectable into other libs?
<mrvn> Qt5? no
<struk|desk> I mean, a reimplementation as you suggested?
<mrvn> struk|desk: that would depend on you reimplementing it that way
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<struk|desk> sure
<struk|desk> your analogy to Qt5 is kind of dead on, as this thing has its own memory model (smart pts) and various other idioms on top of c++
<struk|desk> has its own base object, etc. factories to create everyting..
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<mrvn> struk|desk: kind of stupid since the c++ standard has all that now.
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<struk|desk> mrvn: well that was before such standards existed I hope
<struk|desk> this api is also meant to mimic java's sdk to some degree, as it's a reimpl of a java api in the first place