flux changed the topic of #ocaml to: Discussions about the OCaml programming language | http://caml.inria.fr/ | OCaml 4.01.0 http://bit.ly/1851A3R | http://www.ocaml.org | Public logs at http://tunes.org/~nef/logs/ocaml/
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<caseyjames> Hi. I'm noticing that I am getting the "Unbound module" on a number of opam libraries. OUnit works, but ocamlgraph and sqlite are both giving the error. Any idea how I can get this running?
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<Javran> hello, i'm new to ocaml, trying to get this work: https://gist.github.com/Javran/6913230
<Javran> the error is "This expression has type int -> int -> int but an expression was expected of type 'a * 'b -> 'a", workaround?
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<caseyjames> Hi. I'm noticing that I am getting the "Unbound module" on a number of opam libraries. OUnit works, but ocamlgraph and sqlite are both giving the error. Any idea how I can get this running?
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<ggole> Usually that means that OCaml doesn't know where to look to find that module.
<caseyjames> ggole: what do you think would be the reason that certain opam libraries work and others don't
<ggole> How are you using them?
<caseyjames> I am doing CcCb in Tuareg in Emacs... just open Graph;; open Sqlite3
<caseyjames> I'm just trying to open then
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<ggole> So your toplevel has to know where to locate those libraries in order for that to work
<ggole> Usually the way to do that is #require
<ggole> It might take a bit of setup to get that working, but after a successful #require you should be able to open a module from opam.
<caseyjames> Is that something that I put into .bash_profile? I found this earlier which has similar # commands but I dont know how to proceed http://www.mail-archive.com/caml-list@yquem.inria.fr/msg04139.html
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<ggole> And something in .ocamlinit, too
<ggole> But I think opam will handle that during an install (not entirely sure)
<ggole> Start a fresh ocaml repl and do #use "topfind", followed by #require "some-package"
<ggole> If that works, then you have all the bits in place
<caseyjames> what is a 'ocaml repl' ?
<ggole> Oh, repl is a similar term for 'toplevel'
<caseyjames> Ok, cool. I will dig into that to see if I can get these running. Thanks
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<caseyjames> ggole: ...ooh, it looks like both of them are now running. Thanks again
<ggole> OK, good
<ggole> If you have to compile that code you might have to do another little dance, unfortunately
<ggole> But you can cross that bridge when you come to it.
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<ggole> Interesting trick
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<adrien> morning
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<yezariaely> maybe I am doing it wrong: I always have to convert between lists and sets because (1) I want to have unique elements and (2) I want to have a map that allows 'a -> 'b (Set maps only allow 'a -> 'a) Any ideas about that problem?
<yezariaely> oh, I am doing it wrong. Never mind...
<yezariaely> I should probably use polymorphic sets if I want that?
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<ggole> Set.map doesn't really make sense, since there is no ordering for the produced element.
<companion_cube> you may want to write a functor that takes two set modules and provides a map function
<companion_cube> or use some kind of iterator :]
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<ia0> a mapMonotonic function would make sense like in Haskell for the Data.Set container
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<ia0> x < y ==> f x < f y
<ia0> (or the map would have to suppress elements sent to the same result)
<companion_cube> or, just fold on the first set, building the second set on the fly
<ia0> which is n.log(n)
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<ia0> mapMonotonic is n
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<ia0> what would actually be the signature of a map function in OCaml Set module ?
<ggole> Yeah, seems a bit silly to throw away your ordering just to build it again
<ggole> You couldn't put it in the Set module
<ggole> I think
<ia0> ok
<ia0> is it possible to define the Set module with 'a t instead of t ?
<ia0> what would be the inconvenients?
<ggole> You'd have to have a separate Setmap: functor (Ord1: Set.OrderedType) (Ord2: Set.OrderedType) -> ... or something
<ia0> ah you would lose the OrderedType condition
<ggole> In fact, could you do that? You would lose access to the underlying constructors
<ggole> Although the ordering could be different, so I guess you need to build anyway. :/
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<companion_cube> although the functor may be usable
<companion_cube> let s2 = SetMap(SetInt)(SetString).map (fun x -> string_of_int x) s1;;
<companion_cube> something like this
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<ggole> I'm not sure if S1 and S2 are the right way to do that or not
<ggole> They should be hidden behind a signature, but the type checker doesn't like that.
<companion_cube> ggole: I think you should take the Set.S themselves, not build them again
<companion_cube> otherwise the types won't be compatible
<companion_cube> functor (S1 : Set.S) (Set2: Set.S) : sig val map : S1.t -> (S1.elt -> S2.elt) -> S2.t end
<ggole> Hmm? But the code there typechecks fine
<ggole> (Structural typing ftw)
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<def-lkb> companion_cube: it's only applicative functors, so it's ok.
<companion_cube> but why re-building sets if you already have them?
<def-lkb> it's not rebuilding
<def-lkb> it's just using a composite path for naming the same module
<companion_cube> http://ocaml.nopaste.dk/p62500 <--- this looks a lot like re-instanciating Set
<ggole> Yeah, I wondered whether that was the right approach
<ggole> It typechecks but may be a bit wasteful
<companion_cube> or you can take a minimal signature as input
<companion_cube> like a fold :D
<companion_cube> (and empty)
<ggole> Is SetMap(IntOrd)(String).map supposed to be valid syntax?
<companion_cube> maybe you need a let module ... = .... in :/
<nicoo> ggole: You need a let module
<ggole> Ah
<nicoo> OCaml's syntaxe expects <module name>.map, not <module expression>.map
<nicoo> AFAIK
<ggole> Yeah, that's what I thought
<nicoo> ggole: Complain in Mantis about it :)
<ggole> And that would construct the module at runtime, I think
<companion_cube> apparently it's just a structure
<companion_cube> but yeah
<companion_cube> (maybe also the point of not re-building the sets ;))
<ggole> callcamlMapset2036$2dWn__SetMap_1176
<ggole> Right
<ggole> But that only happens once
<ggole> Whereas the let module = <functor application> happens every function call
<nicoo> ggole: By the way, the current work on inlining might help in defunctorising such stuff.
<ggole> That would be pleasant.
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<nicoo> Though I don't find again the source for this right away, so take with a grain of salt.
* nicoo goes for lunch.
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<yezariaely> can I somehow write a single function that takes a module? e.g. let my_fun X = X.foo
<companion_cube> yezariaely: look for "first-class modules"
<yezariaely> companion_cube: thx for the pointer.
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<def-lkb> companion_cube: it looks a lot but it isn't
<def-lkb> (man ocaml /no-app-funct)
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<pippijn> I don't like this: Warning 28: wildcard pattern given as argument to a constant constructor
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<def-lkb> pippijn: Why? Either disable the warning or fix your code :)
<pippijn> def-lkb: it's not my code
<pippijn> def-lkb: it's camlp4 generated code
<def-lkb> Ouch…
<pippijn> and it makes generating code simpler when you don't need to track the fact whether a tycon has arguments or not
<def-lkb> you will have to deal with it
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<flux> well, you can disable the warning..
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<ggole> How does that arise? Doing something like type foo = Foo;; match Foo _ with ...?
<ggole> Er, match ... with Foo _ -> ...
<flux> yes
<flux> iirc it was a bug it was allowed in the first place
<ggole> Yeah, seems like it should be an error
<flux> but people used it, so..
<ggole> People will probably use anything that passes the compiler
<flux> but that particulat one is pretty convenient for code generation
<flux> even more convenient it would be if you could do match Foo with Foo _a -> Foo _a, I imagine
<flux> apparently also `foo is a bug, but that too is impossible to fix (and for little benefit I guess)
<flux> (lowercase that is)
<ggole> Where _a is all the arguments?
<ggole> That would be a bit of a hack, since they aren't actually a tuple in OCaml
<flux> something like that yes
<ggole> (Although that itself is a performance hack...)
<ggole> Right
<flux> it would probably need a new type :)
<flux> "unboxed tuple"
<flux> and it would probably be very fragile
<flux> personally I just always use type t = Foo (int * int) so I can easily capture the whole tuple part
<flux> I suppose I'll reconsider if I have specific performance needs
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<kerneis> gasche: any opinion about http://caml.inria.fr/mantis/view.php?id=4943 ?
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<kerneis> it just hit me, so I guess it's time to write a patch
<kerneis> but the report (almost) provides such a patch, so I wonder why it has not been applied yet
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<Kakadu> kerneis: It is rather difficult to get him this week
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<adrien_oww> he won't be available before some hours :)
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<smondet> bernardofpc: yes, found back the source! http://caml.inria.fr/pub/old_caml_site/ocaml/speed.html
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<companion_cube> the part about the overhead parameter is interesting
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<kerneis> asynchronous is fine
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<hnrgrgr> adrien: I'm much more confident than yesterday that we will quickly converge to a not-too-complicated proposition.
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<adrien> hnrgrgr: that's great to hear, thanks :)
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<ousado> has anyone seen wmeyer recently?
<companion_cube> no
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<yezariaely> ousado: Last seen : Sep 24 17:44:57 2013 (2 weeks, 2 days, 02:47:53 ago)
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<ousado> wow
<yezariaely> maybe a longer vacation?
<ousado> hopefully
<yezariaely> (I hope)
<bernardofpc> are anyone here from utop ?
<bernardofpc> *is
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<hnrgrgr> ousado: he was at Inria in Paris today.
<ousado> ah
<adrien> pfffft
<adrien> he managed to avoid buying me beers ='(
<ousado> pfffft?
<adrien> :D
<ousado> sounds good then
<ousado> thanks everyone :)
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* robink is having some difficulty getting the ocamlopt compiler, the ctypes library and libffi to properly link/load a library whose main .so file is a linker script.
<robink> and I'm wondering where the bug is, so if it's not in ocamlopt or ctypes, an answer of "It's not OCaml's fault, it's x, go away" is acceptable.
<robink> I am completely new to OCaml, and my only experience is trying to build someone else's app that links to libreadline via libffi (and makes use of it via ctypes). He's semi-new to OCaml as well (but not as new as I am)
<Drup> robink: I never used ctypes so i'm not sure I can actually help you, but you still should give more details.
<nicoo> robink: Ask the ctypes devs. It might be that ctypes doesn't like linker scripts so much
<nicoo> Btw, I assume you run Linux and OCaml 4.something
<robink> Drup: You got it. The application is Grenchman (a fast nREPL client for POSIX systems written in OCaml). Normally, when passed -lflags -ccopt,-lreadline it links with the system libreadline.so, but in the case of Gentoo, /usr/lib64/libreadline.so is a linker script that points to /usr/libreadline.so.6, which is a symbolic link to the correct library, /lib64/libreadline.6.2.
<robink> nicoo: Gentoo Linux, OCaml 4.01.0.
* nicoo headscratches
<robink> nicoo: I also have opam-1.1.0-beta installed, which is necessary to pull in OCaml libraries that aren't in the Gentoo Portage tree.
<nicoo> 'kay
<Drup> AltGr: if you are around : ocp-index master branch don't compile out of the box, it complains about an unbound module Approx_lexer
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<Drup> robink: you should probably try to ask on the ctype repo
<robink> Drup: OK, I'll see what the appropriate question to ask would be.
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<robink> Looks like the author of the package I'm trying to build asked the question for me: https://github.com/ocamllabs/ocaml-ctypes/issues/71
<robink> After talking to people on the ctypes mailinglist, he turned the foreign line into a Dl.(dlopen ~filename:"libreadline.so") call, which allows you to manually specify exactly which file you want opened. However, making the call directly breaks Grenchman on OS X (since it uses .dylib files) and would have to be customized by me for my particular install (have ~filename be "libreadline-6.2.so" instead of "libreadline.so").
<robink> Rather, after talking to people on the GitHub issue tracker etc. He then asked what the best course would be on the ctypes mailinglist and was told to use 'foreign' and have ctypes handle the loading of the library (which it has issues with on Gentoo).
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<robink> Oh, rather he was told to link at compile time, etc. Here's the e-mail: http://lists.ocaml.org/pipermail/ctypes/2013-October/000010.html
<robink> So I guess my question now is: is there a way to change the OCaml linktime options to overcome the Gentoo readline dummy linker script stupidity?
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<caseyjames> Hi has anyone here used the library ocaml-csv or the csv_write in the library core extended