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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<Maelan> i saw somewhere a mention of « the indexed read and write syntax » near a discussion about custom operators
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<Maelan> what is it? would the a.(b) syntax become redefinable?
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<cc_evo> hello
<cc_evo> i'm having hard time iguring out how the algorithm for indentifying prime numbers works
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<cc_evo> o/
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<flux> doesn't the constructor disambigation produce a warning by default?
<cc_evo> wish i could answer that question but I have no idea
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<def`> flux: 40
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<Gvidon> Hello. I'm new to ocaml and have some really basic questions. Like the difference between https://ideone.com/mCngGm and https://ideone.com/w3T9j7
<Gvidon> Obviously, I see the difference in the result I get, but I don't really understand how it happens
<flux> so let f = xxx evaluates xxx right ahead and puts it to f
<flux> it doesn't create a function
<flux> the value of f is now ()
<flux> whereas let f () defines a function from unit to unit (unit being the type of ()). so after let f () the value of f is a function of type unit -> unit.
<Gvidon> What about "let () = xxx"? Why does it do the same thing?
<flux> it does do the same thing
<flux> oh, right :-)
<flux> so actually let a = b isn't an "assignment"
<flux> it's pattern matching, where the left side is a pettern with identifier 'a'
<flux> so for example: let a = 5 <- the pattern 'a' is matched with '5' and as it fits, the number 5 is bound to 'a'
<flux> or: let () = () the pattern () matches (), but because it's a constructor without a free variable, no new bindings are produced
<flux> if your case you are basically doing let () = (..expression returning ()..)
<Gvidon> So, "let f () = " creates a function that takes unit, and "let () = " just "assigns" some value to unit, i.e. throws it away, right?
<flux> yes
<Gvidon> Ok
<Gvidon> Makes sense
<Gvidon> Thanks
<flux> btw, let f () = ... can also be considered to be syntactic candy for: let f = fun () -> ...
<Gvidon> The fact that the same syntax is used for two different things makes it a bit hard to understand
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<flux> I imagine it stems from the idea that functions are values in functional programming languages
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<artart78> more like values are functions, I guess :p functions taking no argument
<flux> I think the very idea of function is that it DOES take an argument :)
<flux> but yes, perhaps the syntax could be though like that as well.
<Gvidon> artart78: No, my example shows that they're two totally different things. This is why I got confused
<flux> I think artart78 was suggesting that functions are in the form let f arg1 arg2 .. and then 'basic binding' is then a zero-argument function let f = x. but, it's really not, in ocaml ;-), because the evaluation is then performed on the spot.
<Gvidon> Or maybe you're right. For me a "a function that takes unit" and "a function that takes no argument" mean the same thing, but I guess it's wrong. I thought it was the same thing as 'void' in C
<artart78> it's because ocaml has eager evaluation
<artart78> a function that takes unit takes 1 argument
<artart78> let f () = ← 1 argument, let f = ← 0 argument
<Gvidon> I see
<Gvidon> It's all pretty confusing for a C++ guy like me. Thanks :)
<flux> a mathematician might say that a zero-argument function is just a constant. and that it is in ocaml :).
<artart78> yes
<artart78> ↑ quite interesting link I just found; maybe too complicated for Gvidon for now though :)
<artart78> well, it only requires lists though
<Gvidon> I'l read it anyway, thanks :)
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<l1x> nice
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<zamy> hello guys :)
<zamy> i have a memory issue using ocaml from c
<zamy> can i borrow someone's help? :)
<freehck> zamy: tell us the whole story! :)
<zamy> thanks
<zamy> i have a program written in ocaml (called hunpos) that works like a charm if executed as native compilated ocaml
<zamy> and i wrote a c interface to use it like a library
<zamy> from c
<zamy> the problem is that with large inputs, while as native it works, i get a segfault after a while from the c interface
<zamy> hence i'm not sure if i'm i'm using the ocaml functions correctly
<zamy> i'll paste the interface
<zamy> here you go: http://pastebin.com/0iNGTqD6
<zamy> note that: 1- the function "hunpos_tagger_new" is called only once 2- "hunpos_tagger_tag" is called multiple times, with about 1k of data, maybe less
<adrien> compaction maybe?
<adrien> hmmm, global_root is there
<zamy> 3- hunpos_tagger_destroy is never called 'cause i have the segfault earlier :)
<zamy> i have ocaml 4.02.3
<adrien> hmm, I'd need to actually try by myself but I can't do that now
<zamy> well i can wait :)
<zamy> do you want a sample to run?
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<zamy> ah, i forgot: the segfault is consistent. I mean, it happens always at the n line of input. I may be wrong , but it seems like the gc isn't collecting some data, that fills the memory.
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<edwin> you can manually call the garbage collector/compact to find out the crash location more precisely
<edwin> also there is a debug runtime that might help
<edwin> ocamlopt -runtime-variant d
<zamy> ty edwin
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<zamy> i'm looking for that
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<zamy> in the inclusion files i can't find a function to force the gc to do its work
<zamy> i'm looking at the headers in /us
<zamy> i'm looking at the headers that i have in /usr/lib/ocaml/caml
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<zozozo> zamy: there is a Gc module on the OCaml side
<zamy> yeah, but how can i access it? its shared header contains only colors and 'Make_header' definitions
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<zozozo> i was actually talking about http://caml.inria.fr/pub/docs/manual-ocaml/libref/Gc.html but I don't knwo how to call these functions from C
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<zamy> :) that's the point xD
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<zamy> edwin: with that flag, i have some extra info on the backtrace, thanks.
<zamy> Anyway, the problem is shown still as internal: camlIo__lowercase_1051
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<zamy> ok, a step forward, even if it is strange
<zamy> with this change in the ocaml side
<zamy> it runs the test (previousley giving segfault) without particular problems
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<zamy> now it gives another segfault with a different test xD it seems there are some issues with the ocaml code anyway, seeing how the previous segfault was solved
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<Kakadu> Let's say we have some recursive functions and we want to trace their execution (tree). How to do this in most convenient way (without forcing a human to insert some code manually) ?
<Kakadu> It could be useful when we want to explain how parser combinators work for this concrete output...
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<ggole> #trace, maybe?
<Kakadu> yep, but
<Kakadu> 1) I want to use custom functions for entering/leaving section (should be hackable)
<Kakadu> 2) it doesn't work in js_of_ocaml toplevel because Obj.is_block works differently there (should be hackable too)
<Kakadu> do you know something less hackable?
<ggole> Um, pass the trace function as an argument?
<Kakadu> ggole: yeah, but I should hack compiler sources in this case
<ggole> O_o
<Kakadu> is there somethin without touch a compiler?
<Kakadu> without touching*
<ggole> Maybe ppx... but I'm not sure how to go about doing that
<zozozo> Kakadu: maybe something could be done using Printexc.get_callstack ?
<Kakadu> zozozo: I want to know when function a calls b and successfully leaves b too
<Kakadu> but it could be an idea
<Kakadu> but my question is about code injection and not about which should be injected
<zozozo> ow, then I'd say call some enter/exit logging function
<Kakadu> I remember some stuff for C# where guys insert some logging in every method. It was called aspect-oriented-programming
<zozozo> I actually have something like in my code for profiling purposes
<edwin> if you have a monadic interface could you add some tracing at the monad level?
<Kakadu> edwin: I have monadic interface but how to do this without forcing a person to add it manually?
<Kakadu> I can hardcore something in predefined functions (let's say parser-combinators to be more concrete)
<Kakadu> but a guy writes it's own parser-combinator and I don't want to force him to add some loggin stuff verbosely
<edwin> hmm could you chain your trace function between all normal binds?
<Kakadu> hmm
<Kakadu> it could be an idea
<edwin> i.e. turn parse_a >>= parse_b into parse_a >>= (fun state -> trace_me '...'; parse_b state)
<edwin> but you also need to somehow know when parsing fails
<edwin> and a new branch is tried
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<Kakadu> edwin: and who should change the code? some syntax extension?
<edwin> I was thinking that you use a functor to 'interpose' between the user oft he parser combinator and its implementation
<edwin> like monad transformers
<edwin> but if you have lots of combinators that might not be very nice
<Kakadu> I kind of don't get how opening another module can add some code to the current functions
<Kakadu> let's say we have
<ggole> It doesn't. It only has a namespacing effect.
<ggole> include adds the contents of a module, open only makes it available unqualified.
<Kakadu> let foo = (string "[") >> (many foo) << (string "]")
<Kakadu> What can I open/include to add some logging about entering/leaving foo?
<Kakadu> I don't understand that
<zozozo> Kakadu: let 'rec' maybe ?
<Kakadu> yeah
<zozozo> well, if foo is in your code base, a ppx could probably do the trick
<Kakadu> let foo n = (string "[") >> (many (foo 15)) << (string "]")
<Kakadu> ppx should detect than if my function is declared as partial or not then
<Kakadu> i.e. ppx should be aware of types
<Kakadu> ( I heard about Jun Furuse's talk this september)
<edwin> I was thinking you could redefine >> to: a >> tracer "entering" (Printexc.get_callstack 1) >> b; and << to a << tracer "leaving" (Printexc.get_callstack 1) << b
<edwin> but this would refer to 'foo' your function
<edwin> not 'many foo'
<Kakadu> hmmm
<edwin> ppx would probably be more flexible but I never tried writing a ppx
<Kakadu> Interesting, what it will print when I compiled this with js_of_ocaml
<edwin> do backtraces work in js_of_ocaml?
<Kakadu> js_of_ocaml erases function names sometimes
<Kakadu> It stores symbol table btw
<Kakadu> but js_of_ocaml gives some comlications at least
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<edwin> maybe wrapping your parser combinator wouldn't be so bad though:
<edwin> string c = let msg = "string" ^ c in entering msg >> Impl.string c >> leaving msg
<edwin> many x = entering "many" >> Impl.many x >> leaving "many"
<edwin> ....
<edwin> and then the user can open ParserDebug
<edwin> instead of Parser when they want the tracing
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<edwin> in entering/leaving you could track the level and print something like:
<edwin> entering string [
<edwin> entering string [
<edwin> ...
<edwin> leaving string ]
<edwin> not sure if thast what you are after
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<zamy> is there a way to force the garbage collection from c?
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<dsheets> Does anyone have experience using Lwt_streams between a pre-emptive thread and an Lwt main loop? They don't seem to flush...
<flux> zamy, well, there is the function caml_gc_full_major aka Gc.major (), maybe you can call it from C
<flux> you may need to release some lock to do it
<dsheets> In particular, Lwt_stream.iter_s doesn't seem to wake up when new elements are pushed by a secondary thread
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<edwin> I know Lwt_unix.make_notification/send_notification works (with Lwt.wait + Lwt.wakeup), do you push elements from the detached thread directly, or do you use the notificaitons?
<zamy> tnx flux but i'm afraid i can't
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<dsheets> edwin, I've been pushing directly... I will investigate the notifications, thanks!
<edwin> the problem with the notification is that its one-shot though, might be complicated to turn that into a stream
<edwin> the typical way I've seen it used was by using a ref set from the thread
<edwin> but its the only function documented as 'thread-safe' in Lwt
<dsheets> Yes, I was wanting to avoid constructing my own stream/sync goop and use a nice existing abstraction, instead
<edwin> how about run_in_main?
<dsheets> ohhhhhh... nice idea
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<dsheets> edwin, works beautifully! thank you! :-)
<edwin> yw, now I wonder why I used the notification in the first place in my code at one place instead of run_in_main :)
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<MrNice> Hello
<MrNice> "hello /n World"
<MrNice> my Ocaml doe not make a new line. Anyone an idea why?
<Kakadu> MrNice: \n
<MrNice> sorry, i mean \n
<flux> mrnice, you mean in the toplevel (shell)?
<MrNice> yes
<flux> well, that's how it (the toplevel) prints control codes
<flux> if you want to put them to your terminal, you need to do it programmatically
<flux> ie: print_string "hello\nworld\n";;
<MrNice> Well, i think i did not understand you correctly
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<MrNice> i am typing "Hello World" in Ocaml-top
<MrNice> And i want an output in two lines
<flux> well, that cannot happen :)
<MrNice> tell this my teacher :)
<flux> here's a solution: "Hello World"
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<flux> what is the exact problem statement?-o
<MrNice> thanks a lot flux!
<MrNice> our class is programming on a low level. We are just working inside Ocaml-top
<flux> I think a reasonable solution would involve the print function somehow.
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<MrNice> It's not important for us. But my teacher searched for an solution.
<MrNice> bye bye
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<edwin> doesn't ocaml-top show stdout?
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<flux> well, it depends what you mean, but you can certainly see what your program writes to stdout (..with ie. print)
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<bibou> hello. when I run make test (for a project based on oasis) I get: "Warning: the tag "tests" is not used in any flag declaration, so it will have no effect; it may be a typo. Otherwise use `mark_tag_used` in your myocamlbuild.ml to disable this warning."
<bibou> is there any way to make my test suite to run when I enter "make test"
<bibou> ?
<Drup> ./configure --enable-tests
<bibou> I have configured through "ocaml setup.ml -configure --enable-tests" its the same, right?
<Drup> yes
<Drup> pastebin your oasis file please
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<bibou> here it is http://pastebin.com/hULRcKum
<bibou> thx
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<Drup> that should work just fine
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<Drup> are you sure it doesn't run ?
<bibou> I'm making some changes. I'll check again in a min. What about the warning?
<Drup> byproduct of ocamlbuild+oasis, it happens sometimes
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<companion_cube> gasche is on a merging spree again, nice
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<bibou> ok it works Drup. I manually removed _build (I have messed up the dir hierachy). make runs tests. thx.
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<mfp> what was the magic to make the moral equivalent of this work? type 'a foo = [ `A | 'a ] constraint 'a = [> ]
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<Drup> type 'a foo = ([> `A] as 'a)
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<mfp> thanks, this works for the slightly less simplified example: type 'a foo = ([> `A of 'a foo ] as 'a)
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<mfp> but uh, it's not very useful in actual use, is it? You have to list all the constructors again (as opposed to only the extra one) whenever you want to add some
<mfp> so the only use is carrying the constraint
<Drup> there are some usages, but mostly with phantom types
<mfp> in this case I have type a = [`A of a list | `B ] and a function : [`A of b list | `B | `C ] -> a option (return None if `C found anywhere)
<mfp> trying not to write type b = [ `A of b list | ...] in full
<mfp> typo ([`A of 'b list | `B | `C ] as 'b) above
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<ggole> mfp: what are you trying to do there?
<ggole> If you just want to avoid typing all the constructors out again, but need recursion, you could try knot-tying.
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<mahem1> Hmmm, ran into some troubles creating an exists_in_queue functions because I forgot to do a Queue.copy and ended up changing the original queue.
<mahem1> Makes me wonder why the Queue.t is modified inplace in the first place.
<mahem1> Like I am tempted to create my own "more functional" queue type that will bypass state issues like this altogether.
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