ChanServ changed the topic of #ocaml to: Discussions about the OCaml programming language | http://caml.inria.fr/ | http://www.ocaml.org | OCaml 4.01.0 announce at http://bit.ly/1851A3R | Logs at http://irclog.whitequark.org/ocaml
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<giarc> Can anyone tell me if there a recommended way to get the base64 package through opam?
<rgrinberg> giarc: $ opam install base64 ?
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<giarc> I did try that, but it didn't go through.
<giarc> I'm not sure if there's something like repositories that can be added that would have it, as the opam package list shows way more than what 'opam list' shows me on my machine.
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<smondet> giarc: `opam install base64` seems to work for me
<smondet> what's your error message?
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<giarc> Hmm... OK. The error was something simple like "package not found" or something of that nature. I did just start updating, so maybe it will work after that.
<giarc> OK, the update totally resolved the issue. Thanks a lot.
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<elspru> how to change array to list?
<elspru> couldn't find it anywhere, none of the api search results functionional
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<asmanur> Array.to_list
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<bernardo1pc> I'm starting to bug my opam :/
<bernardo1pc> on thursday, it did not compile correctly ocamlfind-1.5.2, so it stopped brutally
<bernardo1pc> today, I did an update / ugrade cycle, and it (somehow) compiled ocamlfind-1.5.2 , but now it can't install because
<bernardo1pc> [ERROR] Multiple versions installed for package ocamlfind: { 1.5.1, 1.5.2 }
<bernardo1pc> how's that even supposed to arrive ? I'm doing an upgrade, so it should know better to uninstall the 1.5.1 after 1.5.2 is successfully installed....
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<bernardo1pc> It's getting better... opam remove ocamlfind / opam install ocamlfind fails because (you guessed) 1.5.1 is already installed !
<bernardo1pc> (all this in 1.1.1)
<bernardo1pc> I did upgrade my opam through my distribution, should I have done something magic in between ?
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<bernardo1pc> (but if so, why then did it install correctly other packages, like camlp5 and camlp4 ?)
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<AltGr> bernardofpc, yes, that situation _could_ happen rarely on 1.1 after an interruption ; I'd advise switching to the 1.2 beta.
<AltGr> it's indeed a bug
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<AltGr> you can 'opam remove ocamlfind.1.5.1' explicitely, if that helps
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<AltGr> you can also check that ocamlfind isn't pinned ('opam pin'), and as a last resort edit ~/.opam/<switch>/installed and ~/.opam/<switch>/installed.roots -- but that shouldn't be necessary
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<Drup> AltGr: while you are here: what is the prefered way to have a package pointing to the sub directory of a git repository ?
<Drup> I could create a script that do a cd before executing the build commands but ...
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<AltGr> no good way at the moment, it's not really supported by git ; but that could be nice, yes, cding in opam files is really annoying
<AltGr> if you want to go that way I read somewhere (stack overflow ?) that if it's on github there is a trick though
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<AltGr> using their svn gateway... :p
<Drup> it's not on git :)
<Drup> github*
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<AltGr> sorry, don't have a good solution at the moment ; feel free to open an issue and give suggestions if you have ideas on how best to handle this.
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<Drup> ok
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<boegel|work> hiya!
<boegel|work> I'm a complete n00b wrt OCaml, and I'm trying to get a piece of software working written in OCaml
<boegel|work> the build is failing with "ocamlfind: Package `threads' not found"
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<Drup> (I'm always happily surprised to see the ocaml presence in the bio-info community)
<boegel|work> I found a reference that the threads library is not enabled by default when installing OCaml, but I can't find a reference as to how to enable it (and I'm also wondering why it's not enabled by default)
<boegel|work> any help?
<Drup> boegel|work: which OS ?
<boegel|work> Drup: Linux
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<Drup> which distribution ?
<boegel|work> Drup: Scientific Linux 6, but I'm compiling OCaml myself
<Drup> Oh.
<boegel|work> I basically used "./configure && make world.opt && make install"
<boegel|work> that worked fine, but threads is missing...
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<Drup> the thread library should be enabled by default
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<bernardofpc> AltGr> you can 'opam remove ocamlfind.1.5.1' explicitely, if that helps -> that did not help :/
<adrien> hmmmmmmmmmmmm
<Drup> boegel|work: go where you have all your ocaml libraries and look if you have a threads directory
<bernardofpc> opam pin returns nothing
<AltGr> ok, that's good
<AltGr> what does the remove return ?
<adrien> boegel|work: at the end of "configure" you get a summary of what will be built
<adrien> would be interesting to have a log of configure
<bernardofpc> and (for clarification) opam entered this incongruent state by failing to install ocamlfind because of "bytes" that (according to the newly installed ocamlfind) was already installed and caused make install to fail
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<bernardofpc> The strangest part is that the ocamlfind i have in <switch>/bin is new (like, modif time compatible with my install tentatives...)
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<bernardofpc> AltGr: remove returns 0, but does NOT remove it from opam list
<bernardofpc> I thinkk I will try the hardcore vim way
<AltGr> and if you try to remove ocamlfind.1.5.2 as well ?
<bernardofpc> ocamlfind.1.5.2 is not installed.
<bernardofpc> Nothing to do.
* Drup whispers to bernardofpc : "rm -rf .opam"
<AltGr> bernardofpc, well otherwise, this bug has been fixed a while ago ; release is just going to be out...
<bernardofpc> yeah, but I'd like to avoid recompiling Coq for 1+h
<bernardofpc> is there any way I could check which version of ocamlfind I have installed ?
<bernardofpc> (NOT using opam)
<bernardofpc> (ocamlfind does not honor --version :/)
<bernardofpc> oh, ocamlfind list -> findlib (version: 1.5.2)
<rks`> bernardofpc: I haven't read the conversation, but if you allow me one advice: don't install Coq from opam, or at least create a switch specifically for it. Otherwise you're bound to have to recompile it... frequently.
<bernardofpc> the only point of opam is Coq (debian stable here)
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<bernardofpc> but then maybe I just upgrade when it needs to
<bernardofpc> (well, utop also)
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<Drup> whitequark: "jump through the burning ring" :D
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<Kakadu> boegel|work: Any chance to install OCaml using opam?
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<ricky____> New to OCaml here. I was able to get the base64 library working, but when I try to get the bignum library to work via '#require "bignum";;' in utop, I get 'Error: Reference to undefined global `Zarith_1_2'' Can anyone offer some advice?
<ricky____> Also, zarith isn't underlined (installed?) when I run 'opam list', but when I run 'opam install zarith', it says it's already installed and at 1.2.
<Drup> hum, "bignum" is not a library
<Drup> (afaict, at least)
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<Drup> ricky____: does "ocamlfind list | grep zarith" return anything ?
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<ricky____> Drup: OK, maybe it's a package and not a lib? I don't really have the differences down yet. The command mentioned returns "zarith (version: 1.2)"
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<Drup> then you have zarith
<Drup> why did you want bignum ?
<Drup> the correct name you should require is "num"
<Drup> but if you have zarith, it's better in everyway, you should use that
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<ricky____> Bignum just looked like what I wanted from the name of it. Says it's "Core-flavoured wrapper around zarith's arbitrary-precision rationals."
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<Drup> Oh.
<Drup> didn't know that one
<Drup> the name is highly confusing
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<Drup> ok, try to reinstall zarith and see if it solves your issue
<jerith> ricky____: I got that too. I ended up just using zarith directly and ignoring bignum.
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<ricky____> jerith: The whole thing where it seems like bignum can't see zarith?
<jerith> ricky____: Yes. The same error.
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<ricky____> jerith: OK, I'll give zarith a shot then.
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<ricky____> Drup: Thanks for the effort.
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<ricky____> jerith/others: Were you able to find any decent documentation besides source-diving for zarith? The pdf on OCaml Forge is private.
<Drup> I use ocp-browser
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<ricky____> Drup: I'll check it out. Thanks, again. You always seem to have the answers.
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<whitequark> Drup: since you have all the answers
<whitequark> where is the body?!
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<Drup> what ? x)
<def`> corpse or body?
<Drup> (are you doing a FMA reference ? x)
<whitequark> ... no
<whitequark> just
<whitequark> typical "where are the bodies buried"
<Drup> right x)
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<nicoo> whitequark, Drup : I also read it as an FMA ref :D
* nicoo now wonders what is the definition of type FMA :o
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<nicoo> ricky____: The documentation in the .mli is pretty good. IIRC, you can generate some HTML with ocamldoc if you prefer that
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<zennist> Is there a way to pattern match the type of a value?
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<zennist> I have a use case where I need to write a 'once' function; which takes a function of (unit -> 'a) and only run that function once no matter how many times it's called
<mrvn> zennist: so a Lazy?
<zennist> so I implemented like:
<zennist> let r = ref None;;
<zennist> | None -> let res = f () in r:= Some res; res
<zennist> let once f = match !r with
<zennist> | Some res -> res;;
<zennist> mrvn: that's right
<zennist> I'm a newbie so the immediate problem to my implementation is that once the 'once' function is run with one argument say "f ()", it can't be run with any other argument any more
<zennist> because the saved reference would have mismatched type
<mrvn> zennist: let once f = let r = ref None in function () -> match !r with | None -> let res = f () in r:= Some res; res | Some res -> res;;
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<mrvn> let onced = once f in .... onced (); onced (); onced ()
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<zennist> Ok I see. Using let...in scoping to act like private variable as in some language like Java
<zennist> and then using partial function as an "instance"
<zennist> This way I can avoid polluting my toplevel. cool. thanjks
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<mrvn> zennist: as mentioned Ocaml has Lazy for that, which is optimized in the compiler
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<zennist> mrvn: can you give me an example of using Lazy?
<mrvn> # let f () = Printf.printf "evaluating f\n%!"; 23;;
<mrvn> val f : unit -> int = <fun>
<mrvn> # let once = Lazy.from_fun f;;
<mrvn> val once : int Lazy.t = <lazy>
<mrvn> Lazy.force once;;
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<zennist> very cool
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<zennist> Can someone tell me the difference between "Node of 'a * 'b" and "Node of ('a * 'b)"?
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<flux> in the former, 'a * 'b isn't a tuple that can be captured into a variable of type 'a * 'b
<flux> it can be thought to be part of the triple that contains also the constructor Node (but not really..)
<zennist> ..okay..but the expressions might appear as exactly the same
<flux> in practice, it means the former cannot be matched with expression Node a, it must be matched with Node (a, b)
<def`> the first is a constructor with two fields, the second a constructor with one field which happens to be a pair :)
<flux> but the latter can be matched with both
<zennist> cool
<flux> in practice also it means the former is a bit more memory-efficient
<flux> but if you don't care too much about such things, like I don't, just use the latter so you can easily capture the tuple :)
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<zennist> that's really helpful, especially the difference in pattern matching
<zennist> I do notice that when printing a type the toplevel never includes the brackets for tuples unless absolutely necessary
<zennist> that's the main reason contributing to my confusion...
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<jbza> I would like to define an interface with an abstract type T, then in a separate file, define functions that take in T as an argument.
<jbza> How can this be accomplished?
<jbza> I mean, in a separate file, define functions that take an argument of type T
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<mrvn> you just do.
<mrvn> let foo x = ()
<Tekk_> jbza: you just include the other file
<mrvn> val foo : M.t -> unit
<mrvn> ^^ in the mli
<mrvn> or let foo (x : M.t) = ()
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<mrvn> Doing something usefull with T is harder. you need a functor over the interface or a first class module implementing the interface to use the abstract type.
<Tekk_> mrvn: that's pretty much what he wants though
<Tekk_> he just wants an interface that he can implement
<mrvn> A simpler way is to pass a closure, a record of closures or an object. A functor or first class module is worth it though if you have a bunch of functions.
<mrvn> plus its coolness factor.
<jbza> Thanks for the responses
<mrvn> If you wanted to know about functors then the manual has some simple examples
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<jbza> I have read much about functors today, but have not had much luck
<jbza> What I have (want to do) is this:
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<jbza> "module type foo : type a ..... end" and below it some functions that operate over a provided foo
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<mrvn> jbza: so you need a functor from Foo -> Module_operating_on_foo
<jbza> Ok, and within that functor I would define the operations on Foo?
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<jbza> Many, many thanks
<jbza> That was a 4 hour ordeal for me
<mrvn> grogging functors is hard the first few times
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<ricky____> nicoo: A little late, but yeah, finding and reading z.mli was where I was figuring out what's going on in zarith. I used ocamldoc to generate html as you suggested, and that's really handy. Thanks for the tip!
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<Denommus> if I am to program a compiler for the LLVM, which libraries do you recommend me to use?
<Drup> you mean, "to llvm" ?
<Drup> just use the llvm ocaml bindings
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<Denommus> yes, I meant to llvm. Sorry, sometimes "to" and "for" confuse me because I'm not a native speaker
<Drup> no problem :)
<Denommus> I just checked that they're on opam
<Drup> sure, simply the llvm package
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<nojb> What is the best way to generate OCaml ASTs ?