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<apache2>
what does this error mean: "Error: This expression has type mytype, but an expression was expected of type mytype. The type constructor mytype would escape its scope"
<apache2>
I'm doing: let c = Hashtbl.find colors color in List.hd c.blue
<apache2>
apparently it has a problem with c.blue
<Drup>
show the various type definition involved
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<Algebr>
I'm really confused, I have something that expects a format string apparently and I'm giving it a plain string, now I'm getting this error http://pastebin.com/WTp6cW02, which makes no sense to me...I've trying wrapping it in a sprintf to no avail as well
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<Drup>
show the code.
<Algebr>
let f = "hello" in if Log.Global.level () = `Debug then Log.Global.debug f;
<Drup>
not surprising, just inline f
<Algebr>
I can't do that
<cmtptr>
I bet I can
<Algebr>
Is there no way to turn a string variable into a format string?
<Drup>
Algebr: let f : _ format6 = ....
<Algebr>
right, but I still need to use f as a string later on..
<Algebr>
Is there something that copies results?
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<Drup>
ok, I have a better proposition for you
<Drup>
Log.GlobaL.debug "%s" f
<Drup>
formats are not string
<Algebr>
WAT!
<Algebr>
That works
<Algebr>
why, how
<Drup>
the compiler happen to do gross magic to make it look like they are the same
<Drup>
but they are not
<Algebr>
this is ridiculous
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<Drup>
what is ridiculous ?
<Drup>
"%s" is the format expecting a string argument
<Algebr>
that you can make a format string like that on the fly
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<Drup>
well, I use them quite often and %s is rather frequent ...
<Drup>
(or I don't understand your remark)
<Algebr>
thank you Drup, this is like magic to me.
<struktured>
I think he's happy about but perplexed
<struktured>
*about it
<struktured>
Obj.magic magic
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<struktured>
just wondering out loud...could a ppx solution be equally as powerful as printf?
<cmtptr>
Algebr, having a non-literal format string is sketchy anyway because it dictates the number of arguments the function expects
<cmtptr>
I have no clue how it works in ocaml, but in C it uses varargs and that would be a good way to write some really terrible bugs
<Algebr>
I'm familiar with varargs, but ocaml format strings still are a mystery to me
<Algebr>
Anyway, are there any easy way to making strings that colorize the output on terminal?
<Algebr>
without having to use lambaterm..
<Drup>
Algebr: ansicolor
<Drup>
(but lambda term is cool :D)
<Drup>
cmtptr: in OCaml, it's currently done with GADT
<Drup>
so it's completely typed and the "variadic" behavior is proved correct by the type checker.
<cmtptr>
neat
<Drup>
the only fishy part is that formats look like strings despise being something quite different. And the compiler actually do some magic "if I have type constaints on a string literal to make it a format, I transform it at compile time"
<Algebr>
So if something uses Lwt and you want to use Async, then you can't use that library basically right?
<Drup>
indeed
<Drup>
(just use lwt :p)
<Algebr>
lol
<struktured>
Algebr: yeah it's very frustrating. I'm dealing with that problem right now. I am using async but trying to funtorize it out enough that I could swap in other monadic style (concurrency) frameworks without too much code duplication.
<rgrinberg>
struktured: pick one for your actual app and if wants a port he can help you out
<rgrinberg>
but yeah, have a good reason to use async over lwt
<struktured>
I was thinking I can write my own monad signature, functorize out a few basic concurrency esqu operations
<struktured>
then plugin whatever to make different versions of the lib, as needed.
<rgrinberg>
struktured: how do you know you will need an async port?
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<struktured>
I already have an async port, somewhat :). I need a concept of concurrency in the library itself, although I could simulate it with RNG. I also am probably going to use a riakc client based on async for some important bits. Those two reasons were enough for me
<rgrinberg>
ok then how do you know you need an lwt port :)
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<struktured>
well I want to share my library with europeans
<struktured>
thats all :)
<rgrinberg>
let them ask for it first :P
<struktured>
I am also genuinely interested in coming up with a reasonable strategy for generating async and lwt implementations from one code base, on any project which might need it.
<struktured>
finally, I acutally don't like sexp error handling. I refuse to consider it good enough for ocmal
<struktured>
yes, but w/o the goal of "upgrading" you to core
<struktured>
You can see the conversation in the open issue on there, although I really don't have much more to offer. I don't have a good solution for error handling but I don't think an abstraction library should force Error.t on you either.
<rgrinberg>
why? Error.t will be in pervasives in the next release
<struktured>
you mean Result.t ?
<rgrinberg>
oh yeah
<struktured>
yeah that's cool
<rgrinberg>
you're right Error.t picks the error type for you
<rgrinberg>
Or_error i should say
<struktured>
yeah, exactly. if future functorize over Error.t I would like it much better, but that's not going to happen, and perhaps it shouldn't. I don't really know
<rgrinberg>
hmm isn't error.t just a lazy string underneath? Maybe if core exposed it...
<Drup>
especially since it makes much less sense from lwt's point of view, since Lwt.t already contains potential errors
<struktured>
Lwt's approach is much less intrusive in this regard I'd say, as an error is just another possible state of the monad. (Of course you still have specialized try / catch syntax, but at least it's still just traditional ocaml exception types)
<struktured>
anyhow, I am still trying to prove that polymorphic variants are (not?) the right approach
<struktured>
to myself at least
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<rgrinberg>
r/ocaml is a little slow these days :/
<struktured>
yeah it perhaps the weather is too nice
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<nicoo>
struktured: Why do you think polyvariants aren't right for error monads?
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<struktured>
They seem like a decent choice to me intuitively, but people who use them for a while seem to think they are not worth it.
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<struktured>
nicoo: one complaint is the compiler errors or type signatures can be become huge. I don't have a problem with that- you can sometimes unify the types too which reduces the size of the signature at least
<dubosec>
This is a ridiculously simple question, but I am trying to create a craps program, and there are regular six-sided dice involved. I want to make sure that the "rolls" (dice randomization) makes sense. I would post the code in this comment, but it's a little long, so I will link the github repo here: https://github.com/cdubose/Craps-Game.git
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<Drup>
dubosec: you forgot Random.self_init ()
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<Drup>
struktured: there are various use of polymorphic variants
<Drup>
the one for error types or for "simple" types (in particular, non recursive ones) don't really create the issues you describe
<dubosec>
What does added Random.self_init do? It sounds like it initializes something
<Drup>
dubosec: it seeds the random generator :)
<dubosec>
oh, okay. Thanks!
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<struktured>
Drup: hmm so why do people use it as an argument against them for errors?
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<Drup>
poly var for error handling is just a by product to the fact that the ocaml community can't possibly agree on anything
<Drup>
(well, it's getting better, slowly :p)
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<Drup>
the error messages suck more (and you do loose some confidence in the mighty typechecker), though
<Drup>
it's just not nearly as terrible as when using poly var to encode an AST, for example :p
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<struktured>
because you don't have to match on all cases you mean?
<Drup>
not exactly
<Drup>
it's just more dodgy. If you don't annotate the type, the typechecker will check the types are the same only when composing function, not when defining them
<struktured>
I see
<struktured>
yeah, even with variants you can be a jerk and match on _
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<dmbaturin>
Will Lwt stream push work with preemptive threads?
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<dmbaturin>
Looks like not.
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<ilia>
Error: This expression has type unit but an expression was expected of type <mytype>. This is an error I am getting on the last line of source file
<nojb>
maybe some unclosed expression somewhere ... post the code ?
<struktured>
dmbaturin: what are you trying to do exactly? run a lwt stream read operation in a detached function or something?
<ilia>
let process_file f = let ic = open_in f in let circles = read_file ic in close_in ic; circles let () = let crc = process_file ifile in List.iter print_circle crc
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<dmbaturin>
struktured: I'm trying to handle multiple concurrent connections. I was thinking that to avoid running a thread per connection I could run loops that accept connections, poll descriptors, and handle received messages in different threads, where a descriptor obtained from accept is passed to the poll thread.
<nojb>
sorry need more context to see what's wrong ... where is the definition of ifile, process_file, etc. ?
<ilia>
file is big
<nojb>
gist.github.com is your friend :)
<ilia>
well, 70 lines
<ilia>
one sec
<dmbaturin>
bpaste.net supports ocaml syntax, among others.
<nojb>
dmbaturin: threads in lwt are very cheap so I wouldn't worry about having a thread per connection
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<dmbaturin>
nojb: Well, there are more problems. If I have a thread per connection, and they update some internal state, how do I pass that state between threads?
<struktured>
dmbaturin: is the connection a lwt stream in your case?
<dmbaturin>
struktured: A connection is a file descriptor received from Lwt_unix.accept.
<dmbaturin>
I was thinking of using Lwt_stream to pass messages read from those descriptors between threads.
<nojb>
dmbaturin: well, it depends on what you are doing, but what's keeping you from sharing that state among all the threads ?
<dmbaturin>
nojb: That is, a mutable value?
<nojb>
is the state mutable or immutable ?
<nojb>
any way you can just post all the read messages on a single lwt_stream and then have a single thread read from the strema and update the state
<struktured>
^^
<dmbaturin>
Well, mock example. Let it be a counter service where clients can send INC and READ messages, first increments a counter, second returns its value.
<dmbaturin>
The counter is shared between clients.
<dmbaturin>
ilia: Which line causes the type error message?
<ilia>
the infamous line# 69
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<ilia>
last line
<dmbaturin>
But there are only 62 line.
<dmbaturin>
* lines
<ilia>
the last one
<ilia>
List.iter print_circle crc
<ilia>
that line complains
<nojb>
illia: missing } in line 46 ?
<ilia>
yes, missed
<nojb>
dmbaturin: let counter = ref 0 in let rec loop () = accept () >>= fun fd -> let rec loop1 () = read fd >>= function `Inc -> incr counter ; loop1 () | `Read -> write fd !counter; loop1 () in ignore (loop1 ()); loop ()
<nojb>
something like that :)
<nojb>
ilia: ocp-indent is your friend :)
<nojb>
ilia: another missing } in line 32, also x should be z
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<ilia>
changed
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<ilia>
fixed mistypes, same error
<flux>
why doesn't this result in "default=hello" in --help? Arg.(required & opt (some string) (Some "hello") & info ["c"; "cache"] ~docv:"SERVER" ~doc)
<flux>
it does work if I use 'value' in place of 'required'. maybe this is conflicting somewhere in Cmdliner.
<flux>
but I really need that argument and (Some "Hello") is actually result of a function returning string option.
<flux>
so while I need it it may not need to be given..
<flux>
I could just branch to two different cases depending on if it has the default value or not, but I'd rather not :)
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<nojb>
flux: a required argument cannot have a default value ...
<nojb>
why not value & opt string "hello"
<flux>
cannot? it certainly can :-)
<flux>
nojb, but I don't always have a default value
<flux>
it depends on what the configuration file reads
<nojb>
cannot = it seems to contradict the meaning of required - which is why cmdliner omits it from the man page
<flux>
so is there a shorter way to write this: match best_cache persist with | None -> Arg.(required & opt (some string) None & info ["c"; "cache"] ~docv:"SERVER" ~doc) | Some default -> Arg.(value & opt string default & info ["c"; "cache"] ~docv:"SERVER" ~doc)
<flux>
I would prefer the 'required' would Just Work (TM) :)
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<nojb>
I think this is the right way to write it ...
<flux>
I would like to interpreted 'required' not as that user must provide it but that as Cmdliner is required to provide a value to my function ;)
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<flux>
I think though that it is not quite obvious from the generated documentation which fields are optional and which are not..
<nojb>
required is actually meant to be used only with positional arguments - optional arguments are always "optional"
<flux>
well, I don't find it the best user interface to have a list of arguments that need to be in certain order, in particular if some of those options are not needed if they can be read from a configuration file..
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<flux>
so this functionality of saying: foo: required option --quality is mising is perfect for me.
<flux>
I don't think a command line option library should be _too_ opinionated what can and should be done, unless it defines a "command line style guide" that covers examples of different kind of argument usage scenarios, so that a developer in pinch can refer to that then instead of just dropping the library :P
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<dmbaturin>
What I could do with a variation of nojb's code so far is to hang my machine. :)
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<nojb>
dmbaturin: the code may need some adjustment, but it should not hang your machine ... :)
<dmbaturin>
nojb: Well, your code doesn't compile because the final "in" part is missing. Chances are I made up it wrong. :)
<nojb>
right right it was meant to be more like pseudo code ...
<nojb>
also, accept, read, and write require definitions :)
<nojb>
too many details to work out in one line - just trying to give the gist of the code
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<dmbaturin>
nojb: The "ignore (loop1 ()); loop ()" confuses me. What is the idea here? Why does it start another outer loop?
<nojb>
right - loop () is the accept loop, it waits for an incoming connection and then spawn a new thread (loop1 ()) that reads from that connection and performs the requested action ...
<mk270>
without recommending ocp-indent, can anyone tell me how to get tuareg-mode to indent with spaces rather than tabs?
<theblatte>
(indent-tabs-mode nil)?
<theblatte>
it's generic emacsery, not tuareg-specific
<mk270>
theblatte - thanks - i was sure i'd already tried that - let me try again :)
<theblatte>
if you want that only for .ml files you'll have to work a bit harder
<mk270>
no, i've got it working with a hook now - it was set globally but not working in tuareg-mode. dunno why. fixed well enough for my purposes. many thanks!
<ggole>
indent-tabs-mode is buffer local. Setting it globally using just setq won't work.
<ggole>
You could setq-default, but a hook is probably better (so you are probably in good shape now).
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<mk270>
thanks
<mk270>
you'll all be pleased to know that tuareg-mode has yielded before the crushing onslaught of the wisdom of #ocaml
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<bernardofpc>
hi all
<bernardofpc>
is there a way to programatically know a (good) bound for the size of an array
<adrien>
wrt what?
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<bernardofpc>
not having Out_of_memory appear
<bernardofpc>
(I could bissect the length but this seems a bit awkward)
<bernardofpc>
(I'm trying to write an adaptive Sieve of Eratosthenes, so I'd like to have large-ish chunks on which to do the calculations, evaluate some stats, then throw it away and start with a new chunk afresh)
<Drup>
use growable array and start small.
<bernardofpc>
Idon't understand
<bernardofpc>
my case is that I have the sieve up to 10^7 already done
<bernardofpc>
this allows me to sieve all primes below 10^(14)
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<bernardofpc>
but for the sieve to be fast, I need to profit from the speed gain of NOT doing divisions too much
<bernardofpc>
so for each chunk (say of 10^8 primes) I do only one "mod" per prime blow 10^7
<bernardofpc>
*below
<bernardofpc>
(and I can't grow an array to hold 10^14 bits)
<Drup>
right.
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<flux>
nojb, well, if there are multiple (say 5+) required arguments, is the best user experience achieved with positional arguments?
<flux>
in particular when regular named arguments work nicely with aliases as well.
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<nojb>
flux: sure, am just reporting on the design choices of cmdliner - I don't necessary agree with them :)
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<tobiasBora>
Hello !
<tobiasBora>
I am looking for a Selenium WebServer API for Ocaml, does anyone knows if it exists ?
<apache2>
ocamlfind: Package `ctypes.foreign.threaded' not found - required by `ctypes.foreign'
<apache2>
anyone have an idea how to make it find that?
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<flux>
just a stab in the dark, enable threads?
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<flux>
companion_cube, is there some algorithm for finding in which containers.x a certain module is in?-)
<apache2>
flux: I did :(
<apache2>
I assume that's why ctypes wants the thread thing
<flux>
hmm, so it seems PrintBox should be in containers.misc, but..
<flux>
ah yes, I was looking for it in the wrong way :). Containers_misc.PrintBox it is.
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<theblatte>
is there something I can add to my _tags file so that ocamlbuild will not compile foo.ml even though it's in an included directory?
<theblatte>
the overall goal is that I want to write a use a foo.ml from the current directory and not included/foo.ml, but then it complains at the end that both of them define Foo
<theblatte>
s/write a//
<jcloud>
It looks like ocaml build has an -ignore option
<jcloud>
If you try that on the command line, does that work?
<theblatte>
-ignore included/foo.ml didn't work
<theblatte>
the tag gets added but it compiles anyway
<jcloud>
Oh. :(
<theblatte>
ah, maybe I need to ignore the .mli
<theblatte>
nope
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<flux>
hmm, it seems ppx_deriving comes with .show, but not with .read. are there solutions that give the read, or should I just use (say) json?
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<theblatte>
oh well, I'll move included/foo.ml out of the way in the Makefile before calling ocamlbuild /o\
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<zozozo>
theblatte: I think that having two file with the same way is not a really good idea, generally speaking
<zozozo>
sorry, same name
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<theblatte>
zozozo: sure
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<zozozo>
theblatte: maybe you could rename one of them ?
<theblatte>
I'm trying to hack around something, but maybe I'll bite the bullet and do something more proper
<theblatte>
zozozo: what I'm trying to do is to use a standalone ocaml program with sources prog/ with js_of_ocaml, but I need to modify a few of its modules (eg, file IO) so that it works in the browser, without modifying prog/
<theblatte>
hence the other foo.ml
<zozozo>
sounds like a hask indeed
<theblatte>
the proper way would be to functorise what I need to take a "fileIO" module as parameter I guess
<zozozo>
or use a module MyIO with your modifications
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<theblatte>
but if I need one for js and one for standalone, then I'm back with the same issue
<zozozo>
right
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<flux>
companion_cube, I suppose there's no easy way of going from data to ascii-representation of a tv show list with PrintBox..
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<Algebr>
stuff like having modules named Websocket and WebSockets is insane
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<Algebr>
I'm looking for Lwt_io_ext.sockaddr_of_dns but can't find it, I'm guessing it was removed from the Lwt API?
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<flux>
when in doubt, git clone :)
<flux>
(git log -S str can find commits involving str)
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<flux>
companion_cube, I suppose btw that PrintBox is utf8-aware? not that I have yet had that kind of issuse with anything but my own code :)
<flux>
turns out I cannot just String.sub utf8 strings and expect proper utf8 strings to come out!
<flux>
oh my, it provides 'set_string_len" function
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<flux>
companion_cube, support for ANSI colors/attributes would be nice!
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<flux>
companion_cube, also I do think there are still issues with unicode regardless the length function setter..
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