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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<zRecursive> why do i always get the same data http://paste.lisp.org/display/317207 ?
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<Algebr`> it would help to have a fully complete code sample that can be run
<zRecursive> sorry, just code snippets here
<jun__> actually your code fail on the first assertion
<jun__> since List.length yes_red = 2 and count = 8
<zRecursive> List.length yes_red should be greated thant count
<zRecursive> 1 .. 55
<jun__> well it is not
<jun__> [1 ; 55] is a list with two elements
<jun__> 1 and 55
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<jun__> what youu want is probably something along the line of Array.init 55 succ |> Array.to_list
<zRecursive> oh, there is a function (--) let (--) i j = let rec aux n acc = if n < i then acc else aux (n-1) (n :: acc) in aux j [];; so (1--55) works.
<zRecursive> [1;55] should be [1--55]
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<jun__> rather 1 -- 55 (without brackets)
<zRecursive> yeah
<zRecursive> (1 -- 55)
<jun__> in utop I get different results
<zRecursive> I guess it is due to windows
<jun__> your print_oneRed in your example is dubious as well
<zRecursive> i will check it
<jun__> if you had a complete and minimal exemple it would help
<zRecursive> it is not by hand
<zRecursive> i will check it later
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<flux> this would be cool to make to a web page with js_of_ocaml and webgl :-o http://www.lama.univ-savoie.fr/~raffalli/glsurf.html
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<flux> heh, 11 years old project (docs mention date 2005)
<Algebr`> nice
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<orbifx-m> Hello l
<orbifx-m> All
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<orbifx-m> Does at_exit get called even if there was an uncaught exception?
<mrvn> orbifx-m: why don't you just try it?
<orbifx-m> Time efficiency. Faster and more reliable asking those who might know
<orbifx-m> That said, I just noticed the documentation specifies it
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<reynir> heh
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<flux> thanks for not sharing.. :-)
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<sh0t> guys when I use polymorphic variants how do I specify references I mean say I have: type a = [`Int of int| `String of string] is there a way i can then do: type b=[ a ref | `Float of float] ?
<companion_cube> type b = [a | `Float of float]
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<sh0t> yes but i want b to be either a reference to an a or a Float of float...
<Drup> a ref is not a polymorphic variant
<Drup> you need poly variants.
<sh0t> sorry Drup I am very new of ocaml...can you please point me at the right web page to start reading bout them?
<companion_cube> type b = [`Ref of a ref | `Float of float] ?
<Drup> sh0t: honestly, if you are very new, don't use poly variants :)
<sh0t> so companion_cube the point is I didn't want to add a new constructor...for ref if possible...cause it's getting a pain ...
<Drup> use normal variants, they are quite easier to use, then you can jump the hook later on
<companion_cube> sh0t: I understand, but the thing is, you need something to know if you're manipulating a reference or a `Float of float
<companion_cube> (and +1, poly variants are not really a beginner topic)
<sh0t> so should not use poly variants either lol?
<sh0t> *should I
<sh0t> :)
<pierpa> why do you think you need to use them?
<sh0t> it's not strictly necessary I think but: say i have a type a=A of...|... and then another one type b=C of int |...| N of (a ref). Now to construct an object of b i need to concatenate a constructor for a and one for b (plus ref...) when it's actually the type a that i am working on...
<sh0t> not sure if i am clear ...probably not.
<sh0t> So i thought let's use polymorphic variants...that would allow me to use a as b but I cant use ref...
<pierpa> polymorphic or not, they're still algebraic types. They need a constructor
<pierpa> and, you are getting into trouble just because you don't wa to type N!
<pierpa> +want
<sh0t> yes they need a constructor sure...
<pierpa> THAT's lazy
<sh0t> ?
<companion_cube> thaT's LazY
<sh0t> i don't think i am lazy i was just thinking that I was having a bad style of programming
<pierpa> using a constructor for your refs is ok
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<sh0t> ok one problem i had is this: say i have another type c=D of...|M of (a ref)...
<sh0t> say I want a function from b to c I mean (let's sya we only care about elements of he form N(a ref) on the domain and M of (a ref)...
<sh0t> now doing something like: let f x= let N(t)=x in M(t) is it ugly?
<pierpa> I think it's normal
<Drup> what do you do if it's not a N ?
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<sh0t> well Drup it shouldn't happen from the way i am writing my programm but i should actually raise an exception or let ocaml do that for me...
<sh0t> (this is probably bad)
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<mehdib> this IS BAD
<pierpa> hmmm
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<Drup> sh0t: why not just pass the ref, then ?
<Drup> instead of the N
<Drup> if you are sure it's an N, you have already pattern matched, so you can pass the ref directly
<sh0t> mmm
<Drup> in general, sh0t, first do it with good old ADT and some carefully placed assert false
<Drup> then, we you are more fluent in OCaml, use fancy types
<sh0t> ok Drup
<sh0t> another thing
<Drup> when*
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<sh0t> is it bad practice to add type annotations to your function arguments?
<Algebr`> not bad practice
<Drup> it's not bad practice, but it's not idiomatic
<sh0t> ok it helps me
<sh0t> i mean in general
<Algebr`> if it helps you then do it
<sh0t> ok
<Drup> Are you using merlin ?
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<sh0t> mmm no u mean the emacs-thing?
<Drup> it's not emacs only, you can use it with some other text editors
<sh0t> i am using tuareg...
<Drup> You should use it
<sh0t> ok
<sh0t> why?
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<reynir> It's awesome
<sh0t> ahah fair enough
<Algebr`> tuareg is like syntax highliginting in emacs
<Drup> lot's of goodies, see for yourself https://github.com/the-lambda-church/merlin
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<Algebr`> merlin is independent of emacs
<Algebr`> it provides code completion, typechecking. Will help you not have to use type annotation since you could just check the type of any expression
<Algebr`> sh0t:
<sh0t> ohh
<sh0t> good
<sh0t> i'll try that
<sh0t> ok thanks guys
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<Algebr`> sh0t: while you're at it, could also look at ocp-indent, has editor plugins as well
<Algebr`> I'm wondering about this:
<Algebr`> Say you do Lwt_preemptive.detach
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<Algebr`> No point then to do Lwt.async in the thread right, since you already did a detach
<Algebr`> Assume there is only task to be done
<Algebr`> Could it be argued that detach and async are interchangable in some situations?
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<Algebr`> one task*
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<Enjolras_> Algebr`: yes. Actually detach use Lwt.wait/Lwt.wakeup under the hood
<Enjolras_> detach basically sends a message to a pool of threads via a queue, the worker threads peek tasks from the queue, execute, and send back the results to the main thread which does Lwt.wait to waekup your waiting thread and detach completes
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<Algebr`> right, Lwt is so simple
<Algebr`> Enjolras_: thanks!
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<seangrove> Algebr`: Just a heads up that the Mirage fortnight call is in #mirage right now
<Leonidas> is there a lua_of_ocaml compiler? or a beltscript compiler?
<Algebr`> noooo my cat chewed through my laptop charger
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<Drup> Leonidas: that would be fun
<Leonidas> is your cat still alive?
<Algebr`> she's too sweet to be mad at.
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<Algebr`> what is beltscript
<Leonidas> Drup: yeah, I got a few backends like Factorio or LOVE that I could program for
<Leonidas> Algebr`: the lua equivalent to bucklescript
<Drup> I'm not even sure what that is supposed to be
<Algebr`> Lua -> JS?
<Leonidas> one is a game and the other a game engine. but there are many applications that can be scripted in lua
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<Algebr`> nginx can be scripted with lua
<seangrove> Redis as well, I believe
<Algebr`> I see lua used a lot in games
<seangrove> That's the common wisdom, yeah
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<sh0t> guys I am trying to use merlin but i keep getting "Unbound module..." error
<sh0t> I have for now the .ml in the same dir..and the mli in another one by the way i am tryign to use a .merlin file but it seems it doesn't work
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<companion_cube> you probably need to add the build dirs
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<companion_cube> https://github.com/c-cube/ocaml-containers/blob/master/.merlin <-- example of .merlin file: both source paths and build paths
<sh0t> yes i did that
<sh0t> i have something like:
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<sh0t> S src/
<sh0t> B _build/src
<companion_cube> you also need to have built the other modules
<sh0t> well in _build/src there are the respective .cm[i|o|t]
<def`> sh0t: emacs or vim?
<sh0t> emacs
<def`> Try M-x merlin-project-check
<def`> Tell us what is the output :)
<sh0t> it says...Loaded .merlin files: /home/gpietro/proj/.merlin
<def`> what happens if you type C-c C-t on some expression? Can you see types from your project?
<sh0t> def`, yes I can...i don't know why it works now...
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<sh0t> i added B _build/src/*
<def`> you have subdirectories ?
<sh0t> no
<sh0t> it's weird reading the doc i shouldn't need that
<def`> maybe the .merlin file was not updated when you first tried.
<sh0t> mmmm maybe but i doubt that
<def`> you shouldn't need this last line yes, try again without it
<sh0t> ok
<def`> sorry I cannot help more :)
<sh0t> it's ok thanks anyway. A question when i edit .merlin
<sh0t> shoud i do something to "load it"?
<Algebr> Nothing
<Algebr> Merlin will read it
<sh0t> allright thanks
<sh0t> anyway now without the * works too
<Algebr> say you are using lwt, then you just need PKG lwt
<sh0t> ok
<Algebr> the _build/src/* sort of assumes oasis/ocamlbuild. Its where the compiled code is.
<Algebr> but you can choose whatever you want to be that path
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<sh0t> ok. Guys I have another question: I am trynig to implement a semantics for a toy language. This semantics has a lots of complex rules.. so I thought I'd define a function for every rule and then in another function i'd pattern match on the expression and call this functions. Now this functions in general go from expr->a, but every single "small function" takes care only of a specific constructor for expr. This means that when I pattern
<sh0t> match on the expression on the small function i get a lot of warnings (cause i don't cover all the patterns). Whatwould you guys do? I am sure there is a smarter way.
<Algebr> have you heard of menhir, ocamlyacc, ocamllex?
<thizanne> sh0t: let's say one of your patterns is Construction (arg1, arg2, arg3)
<sh0t> yes. But those are for parsing and lexing...
<sh0t> ok thizanne
<thizanne> currently you have let deal_with_construction (Constriuction (a, b, c)) = ...
<thizanne> and a matching warning
<thizanne> change it to let deal_with_construction a b c = ...
<thizanne> and have a big function which does match thing with ... | Construction (a, b, c) -> deal_with a b c
<sh0t> yeah i guess that's the way to go...
<thizanne> it's one way to go, i'm not sure being afraid of one big function and splitting it into several ones that don't factorise anything is the right way to do things
<thizanne> i personnally often do it though
<sh0t> i don't like big functions personally.
<sh0t> Also i find that using small functions helps me to match with the rules of the formal semantics better
<sh0t> and so "i think" i can reason better about programs
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<sh0t> just a vague opinion
<sh0t> :)
<sh0t> Algebr, sorry maybe I didn't understand..why did you mention to me those tools?
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<Algebr> sh0t: I thought you were making a programming language
<sh0t> yes I am..a very simple one and yes I did use ocamllex and ocamlyacc for the first stage.
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<Algebr> ohh, you're writing the eval function
<Algebr> or somethign like it
<sh0t> actually so far that was the harder part...doing that WITHOUT those tools i think i'd kill myself.
<sh0t> yes thee eval :)
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<Algebr> if you're in the Bay area then consider coming to OCaml office hours on Friday in SF.
<Algebr> sh0t:
<sh0t> ? i don't know what that is :)
<sh0t> oh i see
<seangrove> Algebr: This Friday won't work for me, sadly. Maybe next week.
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<Algebr> SF is San Francisco, USA.
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<Algebr> seangrove: no probs, I finally made it reoccuring so it will happen each week automatically.
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<struk|work> I need to make it back out there
<struk|work> its too hot i nyc
<struk|work> *in
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<Algebr> weather is pretty much ideal here right now
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<Drup> sh0t: I tend to just make a big function which all the cases
<Drup> the issue with lot's of small functions is that you often need to touch some state, and you end up with each small function having 15 arguments
<sh0t> yeah Drup while I am working on it i am experiencgin something similar so yeah the function is getting as a result bigger than i wanted
<Drup> one alternative is to make a type state = { ... } will all your pieces of state
<Drup> which helps manage that a bit
<Drup> and then your evaluation function is just "eval : state -> term -> value"
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<sh0t> where can I read a bit more about this tecnhique?
<Drup> I'm not sure it's really written anywhere ^^'
<sh0t> oh allright...cn you please be little more specific then?
<sh0t> :)
<Drup> it's probably going to be "eval : state -> term -> state * value", actually
<Drup> well, what's the type of your eval function right now ?
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<sh0t> at the moment: expr -> heap -> environment -> (expr*heap)
<Drup> so you have all your state in the heap, so that looks enough
<sh0t> the heap is supposed to be where i store all references to data object (in the language)
<sh0t> i am not sure it is what you meant before
<Drup> yes
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<sh0t> yes like it is?
<Drup> You are already doing what I was saying, you have one type that contains all your state and you pass it around, and it's all fine
<sh0t> oh ok
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<rgrinberg> vbmithr: mind if I cherrypick your harmless changes? or would you like to extract out a patch yourself?
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<steve_gh> Hi. How would I define a constructor for a tuple type (say type foo = float * float). I want to ensure that a function that modifies foo's has type signature foo -> foo, not foo -> float*float
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<tane> steve_gh, what's wrong with defining the signature as such?
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<pierpa> I think they mean that sometimes the type will be inferred and printed as float * float instead of the desired foo
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<steve_gh> tane - my foo is actually a (prob, value) pair, so I know the first element of the tuple is in the range 0.0 to 1.0
<steve_gh> pierpa. My problem is that the type inference leaves me with a mismatch between the sig function type foo -> foo and the inferred struct type foo -> float * float.
<steve_gh> So if I had a constructor for foo's I could ensure that the return type of the function was forced to be a foo, not a float * float
<pierpa> I may be wrong, but I believe that with that type declaration there's no difference between foo and float * float
<pierpa> to force printing the type as foo you can use a type annotation in the right spot
<pierpa> If you use a contructor, I'm not sure if there's a runtime cost
<pierpa> or you could use a module and make the typeabstract
<steve_gh> Possibly a constructor function is the path of least resistance
<pierpa> then just type foo = Con float * float ?
<octachron_> an intermediary solution would be a private type "type t= private float * float"
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<pierpa> *then just type foo = Con of float * float ?
<octachron_> with a private type, you can enforce that foo is only created using a specific construction function but can still be deconstructed to float * float if needed
<pierpa> looks like the best solution
<steve_gh> thxs
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<Drup> pierpa: a construction means one added indirection
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<pierpa> Drup: ok. ty.
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<apache2> is there a good resource for reading about the 'private' keyword? I haven't seen it before, it sounds useful
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<pierpa> I seem to remember that RWO explains it
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<chelfi> It does
<pierpa> Yay for my memory!
<apache2> aha, thanks!
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<Algebr> nice JS blog post about it too
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