<smondet>
(the `Printf` module is older than the word “blog” :) )
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<Algebr>
smondet: yea, I read that, was curious about something like lower level than that, but i guess its a silly itch.
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<Algebr>
do either lwt or async offer like a choice in scheduling policy? or does that not make sense?
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<struktured>
any ocamlers going to mlconf tomorrow?
<struktured>
sorry, I should say, any nyc ocamlers going to mlconf?
<meteo>
In terms of file and socket IO, lwt just waits on a select() call. It's up to the OS how it deals with those resources
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<Algebr>
Does anyone have an example of using Yojson where the input data doesn't start with json but rather you make json out of it. Something like Yojson.empty, then Yojson.add or whatnot.
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<struktured>
grrrr..over 30 minutes to a resolve a cycle in my build system with one line change in two files. sigh
<Algebr>
so painful.
<struktured>
I've been refactoring a project into individual module libraries. this has happened several times in the process already. it's sneaky open Statements that are usually my root cause.
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<ggole>
That's what I mean by predefined: like int or string, not defined in OCaml code but built into the compiler
<ggole>
I think the rationale is that the C code can generate these exceptions
<flux>
probably means that compile-generated code can throw Not_found then?
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<flux>
ggole, C can generate whichever exceptions were they in defined in OCaml or not, though?
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<flux>
but perhaps it was more convenient to implement it that way. it's not very significant :)
<ggole>
It might be problematic for the C code to depend on the OCaml code, which in turn depends on the C code
<ggole>
eg, for bootstrapping
<ggole>
But I'm guessing here
<ggole>
Or maybe it's that the predefined exceptions don't have a dynamically allocated id, which could be more efficient/convenient
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<reynir>
hm, it seems ocp-indent broke in vim for me
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<reynir>
Ah, it's loading the indent file from the vim distribution first
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<reynir>
My non-solution was to just delete the one from the vim distribution
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<Algebr>
flux: thanks for that paper
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<ia0>
is there a way to change the locale in an OCaml program?
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<mrvn>
unix module? extunix?
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<Algebr>
I get a warning that String.unsafe_set was deprecated, what is its replacement?
<Algebr>
is it Bytes.unsafe_set or so?
<mrvn>
you have to eoi every PIC interrupt
<mrvn>
ups
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<ia0>
mrvn: there is nothing in unix nor extunix
<ia0>
do you have a precise function in mind?
<ia0>
I'm referring to setlocale (POSIX function)
<companion_cube>
if extunix doesn't have it, maybe you can contribute it
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<Leonidas>
Algebr: unsafe_set?
<Algebr>
Leonidas: ya, found it, thanks
<MattZen>
Heya folks. I'm looking to create a function that can take a list of integers [2;4;5;10;4] and check to see if any two are prime. If any two numbers together are prime, I would like to return a list with those two numbers added together
<MattZen>
like [2 4 5 10 3] -> [2 9 10 4]
<MattZen>
w :: x :: y :: z is my pattern
<MattZen>
but I'm unsure how I can do this
<MattZen>
I have a function to check if a number is prime
<kakadu>
Does order matter?
<MattZen>
For me I'm trying to get it in order, to see how it processes it once I trace it
<MattZen>
But I can't get my head around how to pattern match it
<MattZen>
and that final 3 should be a 4 I just noticed
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<Leonidas>
MattZen: you only need to match 2 elements, don't you?
<MattZen>
Yes actually you're right,
<MattZen>
simply hd :: tl perhaps
<Leonidas>
MattZen: also, how is 4 prime?
<MattZen>
it isnt
<MattZen>
but 4 5 are together
<Leonidas>
cand1::cand2::xs
<MattZen>
and one of them is, so it adds them
<Leonidas>
you mean coprime?
<MattZen>
I suppose so yeah
<mrvn>
how is 2 the sum of two numbers, one of which is prime?
<MattZen>
I mean
<Leonidas>
mrvn: it isn't. non-coprime numbers are left as-is
<MattZen>
it will check two numbers together, determine if a or b is a prime then sum, else check b c
<mrvn>
2 or 4, 2 is prime, output 6
<Leonidas>
ah, now i get it
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<Leonidas>
disregard coprime, I misunderstood earlier.
<mrvn>
so it should be [6 9 15 13]
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<Leonidas>
should summed up numbers be consumed? because then 9 wouldn't be part of the result
<Leonidas>
since 4 is consumed in 6
<MattZen>
good point
<mrvn>
that depends on what it's supposed to be in the first place
<mrvn>
so far the problem has been woefully under specified
<MattZen>
yeah you're right.
<MattZen>
It was more simply trying to figure out how to pattern match it
<MattZen>
ok, save for numbers 1 and 2, I'd like to achieve the same result
<mrvn>
let rec loop last = function [] -> [] | x::xs -> test_pair last x; loop x xs
<mrvn>
or let rec loop = function [] | [_] -> [] | x::(y::_ as tl) -> ...; loop tl
<MattZen>
that looks so much more simpler than what I have
<mrvn>
or let rec loop = function | x::(y::_ as tl) -> ...; loop tl | _ -> []
<MattZen>
thank you
<MattZen>
this clears it up for me a lot
<Drup>
Algebr: yes, Bytes
<Drup>
(and there is little point in using unsafe_set, just use set)
<Drup>
(the cost of the bound checking is negligible)
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<Algebr>
Drup: You mentioned that d3 is too dynamic to use with js_of_ocaml, what does that mean exactly?
<Drup>
it's ... hard to type
<companion_cube>
it would need d3pendant types
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<Drup>
:D
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<S11001001>
companion_cube: ha ha ha.
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<reynir>
bad joke: you press "d" and then "3"
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<Algebr>
after doing just ocaml for a bit and now having to do JS, its really eye opening to notice how much other code is driven by side effectrs
<Algebr>
effects
<Denommus>
Algebr: and how much dynamic typing gets in the way of correct code
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<smondet>
I think want you want is called polymorphic records … it looks like you want `pos` from any thing that has a method `pos`, this structural sub-subtyping, and ocaml provides that through objects, not records
<smondet>
s/want you want/what you want/
<smondet>
is *not* called
* smondet
needs his 5th coffee...
<bernardofpc>
yeah, that's what objects provide in OCaml
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<bernardofpc>
you can build a functor for that, also
<mahem1>
Fair enough. I am still wondering behind *why* this doesn't work.
<bernardofpc>
because obj.pos has to have a type
<bernardofpc>
and obj itself (argument of your function) also
<bernardofpc>
so your function can only be Ball.t -> int * int or Box.t -> int * int
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<mahem1>
I guess.
<bernardofpc>
if you want "everything that has a <pos> " -> <type of such pos>, you need some other thing
<bernardofpc>
for example, you can make a Functor
<mahem1>
I'll dig into functors then. (haven't used them before)
<mahem1>
Thanks.
<bernardofpc>
like module M(T: sig pos : a end) struct let f (x:T) = x.pos end
<bernardofpc>
(not 100% sure it will work)
<bernardofpc>
and then you can have M(Box).f : Box.t -> int * int
<bernardofpc>
and M(Ball).f : Ball.t -> int * int
<bernardofpc>
you could also have M(star).f : Star.t -> float * float * float
<mahem1>
That star example just confused me more. Starting to look a bit like C style operator overloading... But I'll look mor einto functors.
<bernardofpc>
yeah, look into functors
<bernardofpc>
the classic use-case is building Hashtables
<bernardofpc>
module M(T: sig type t val pos : t -> 'a end) = struct let f (x : T.t) = T.pos x end ;; -> a working solution
<bernardofpc>
(but not how pos is defined as a function on type t)
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<bernardofpc>
*note
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<lpl>
Is there a way to match multiple types at once in Ocaml? For example type foo = a of int * int | b of int * int, and I want to match bar:foo with | a(x, y) or b(x, y) -> x+y
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<lyxia>
a (x, y) | b(x, y) -> x+y
<ollehar>
just make two match casess..... damn too slow
<tane>
ollehar, same here :)
<ollehar>
;)
<ollehar>
but that "or" syntax looks nice, too :)
<tane>
ollehar, i read your shower thought on reddit and found the following discussion rather interesting, thanks for posting it :)
<lpl>
I don't want to make two cases because in my actual implementation there are 30 cases of the same thing :(
<ollehar>
tane, haha
<ollehar>
it's the highest controversial post on that subreddit! I'm the best troll!
<ollehar>
but yes, it's always interesting to discuss why the heck some languages get so high popularity.
<tane>
yeah :)
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<ollehar>
anyway, my question for the night: possible to make a functor out of "file" module?
<ollehar>
or must I be explicit?
<ollehar>
lpl: ? pastebin?
<tane>
ollehar, if you don't mind me asking slightly off topic, what city/region are you located at? :)
<ollehar>
tane: hannover now, from sweden originally.
<tane>
ah ok
<ollehar>
and you are from USA, according to irc
<tane>
i live in osnabrueck, just curios if people using ocaml in germany would at some point meet the critical mass for some kind of user group or meetup
<ollehar>
yeah, I'm interested in that. I'm at a conference right now, actually (php, typo3).
<ollehar>
so I thought, "this would be nice for ocaml".
<tane>
haha ok
<ollehar>
I think they meet regular in paris.
<tane>
yeah
<ollehar>
phd:s all of them
<ollehar>
phd's
<ollehar>
*
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<tane>
yeah, but i guess that's the academic side of it
<ollehar>
sure
<tane>
anyway, i got to go for tonight. good night :)
<ollehar>
bye
<MercurialAlchemi>
typo3?
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<MercurialAlchemi>
you're really from scandinavia :)
<MercurialAlchemi>
ollehar: have that in DK too
<ollehar>
it's big in denmark, but I had never heard about it since I came to germany.
<ollehar>
some dude aske seems to be a typo3 rockstar
<ollehar>
made the webpage for venster
<MercurialAlchemi>
what's venster?
<MercurialAlchemi>
and I think it's completely unknown outside of the northern countries
<ollehar>
MercurialAlchemi: oh, you're not from denmark. :D it's a political party, the biggest I think.
<ollehar>
(in denmark)
<MercurialAlchemi>
oh, Venstre
<ollehar>
hm ok
<ollehar>
yes
<MercurialAlchemi>
which means left, which means of course they're the conservatives
<MercurialAlchemi>
not that you could tell the difference with the social democrats
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<MercurialAlchemi>
that said, you're right, I'm not from DK, but I live there
<ollehar>
Aha
<ollehar>
It's all making more and more sense :)
<ollehar>
You're at the university in copenhagen?
<MercurialAlchemi>
not set a foot in university since around 2001
<MercurialAlchemi>
but I live near Århus, in Jutland
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<MercurialAlchemi>
so you're a Swedish expat in Germany
<ollehar>
Yep
<ollehar>
And OCaml expat in PHP ;)
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<MercurialAlchemi>
haha
<MercurialAlchemi>
well, it's a hell of lot easier to find people who give you money to write PHP than OCaml, that's for sure
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<ollehar>
True dat
<ollehar>
aarhus seems like a nice place
<ollehar>
hannover is a very generic town, I'm afraid.
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<ollehar>
maybe we can have an ocaml get-together in hamburg...
<MercurialAlchemi>
that'd be nice
<Leonidas>
MercurialAlchemi: oh, I found a place, wasn't so hard.
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<Leonidas>
(and I think they are still looking for more)
<Drup>
Leonidas: job wise, you mean ? by curiosity, details ? :p
<ollehar>
(still, my question: functor of file module - possible?)
<Leonidas>
Drup: yes. Writing on a compiler for an in-house language for graphics programming.
<Drup>
ollehar: you mean you want a file-module parametrized by some signature like it was a functor ?
<MercurialAlchemi>
Leonidas: if it's (not finance and remote) I'm interested
<ollehar>
drup yes, but I found a stackoverflow about it
<yminsky>
Does anyone know if there's a good way of having local opam switches?
<Drup>
yminsky: local to what ?
<yminsky>
i.e., I want to use one opam switch in one context, and a different in another.
<Drup>
sure
<Drup>
eval `opam config env --switch FOO`
<Drup>
will switch only in the terminal
<yminsky>
Ah, interesting. That's pretty good.
<Drup>
I use that quite often when multitasking between "answering IRC questions" and "hacking on trunk" :D
<yminsky>
It would be cool if you could get per-directory switching in a way that emacs understood too. But that's a bigger ask, I suppose.
<xificurC>
Drup: thanks, that's more than enough :)
<Drup>
yminsky: there is a feature request for that on opam
<yminsky>
We have that at work, effectively, though not through opam.
<Drup>
but it seems tricky
<Drup>
(for opam)
<yminsky>
It's quite nice when it works.
<yminsky>
We basically have our build system spit out merlin files everywhere. Merlin points to the right OCaml version, and so you're set for your IDE-like featurs.
<yminsky>
And as you switch from tree to tree, you automatically switch to whatever version of the libraries and such that you need.
<yminsky>
If you could get the merlin file to effectively point to the right opam switch, that would kind of give you what you need.
<yminsky>
I'll ask Thomas about it.
<Drup>
it effectively ties up merlin to opam, though
<nicoo>
Drup: How good/useable is OCaml-Java ?
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<Drup>
why do you ask me ? :D
<yminsky>
Sortof. In some sense, all Merlin needs is a directory.
<yminsky>
Maybe it could be done exclusively through emacs magic that sets up how merlin is invoked.
<Drup>
yminsky: and regardless, the build system need to be aware too, merlin only doesn't help
<yminsky>
Sure. Merlin and the build system both need to be invoked with the right environment.
<Drup>
opam really works by env variable
<Drup>
and switching env variables by entering a repository is not reasonable
<Drup>
a directory
<yminsky>
Well, we do just that within emacs for how we invoke our build tools (including Jenga), and I think it works quite well.
<Drup>
so you will probably need some sort of frontend to pipe the calls to all binaries
<yminsky>
I agree I wouldn't want it on the shell.
<Drup>
ah, ok, just in emacs
<yminsky>
I think.
<Drup>
well, yeah, you can do some emacs voodoo
<yminsky>
Hmm.
<Drup>
but I don't like emacs voodoo :D
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<yminsky>
Actually, Jenga is sensitive to the directory that it's invoked in, and that seems right.
<yminsky>
Maybe your build script should explicitly specify its opam switch. It seems like it's part of the environment, after all.
<Drup>
yeah, like I said, frontend to pipe the calls to binaries :p