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<granttrec>
is the opam package in ubuntu good?
<Fare>
OK, I wrote a great implementation of tries, and I want to extend to cache node hashes, and I'm in Lisp I'd use inheritance, but with OCaml modules I'm not sure how to do it. How do you extend every type in your module?
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<discord3>
<bobby> Fare, would wrapping it in another module (i.e. functorizing it) work?
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<whitequark>
there's still no way to put a `'a foo` into a hash table short of using an existential, right?
<octachron>
more a universal quantification, no? (type 'a l = { x:'a . 'a list } let x = {x=[]} ). But yes, polymorphic types cannot be stored inside mutable data structures.
<whitequark>
not with that attitude they can't
<whitequark>
I just rewrote some horrible code in Coq with GADTs
<whitequark>
octachron: you are actually right, I can unbox the key too.
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<neiluj>
Hi ! I'm wrestling with ocaml's package manager opam : there's a lot of packages which can't compile because of the error "Unbound module Toploop"
<neiluj>
I'm using ocaml 4.06 and opam 1.2.2 if it might help
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<octachron>
neiluj, if you are using archlinux, you are missing the ocaml-compiler-libs package
<octachron>
also opam-owned installation of ocaml(i.e. opam switch 4.06.1) are often more reliable than system-wide installation
<neiluj>
octachron: yes, I'm using archlinux, I'll look at it
<neiluj>
thank you
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<neiluj>
yes, it eventually compiled !
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<dmbaturin_>
octachron: I'm wondering what would be the best way to reconcile opam-owned compilers with package build tools that use a fake root.
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<octachron>
dmbaturin_, I have no idea
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<octarin>
Hi
<octarin>
Is it possible to make a function couples x k, such that couples x 0 = x, couples x k = (x, couples x (k-1)) or is is forbidden by the fact OCaml is static ?
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<Fardale>
octarin: have you try to write the type of such function ?
<octarin>
Fardale: I can’t of course
<octarin>
I don’t know the result type, it depends of the second argument
<Fardale>
If you can't write the type then you can't have such function
<thizanne>
octarin: why exactly would you want to write this ?
<octarin>
thizanne: i have a program that constructs intersections of finite automatons
<thizanne>
yeah you'll need to be a little more precise :)
<octarin>
the automatons are represented by their transition function which is a ('a * 'b * 'a) list
<thizanne>
but as you wrote it, your result is basically a list of k elements (each one being x)
<octarin>
well, the problem is the intersection of two automatons has a different type
<octarin>
inter : ('a * 'b * 'a) list -> ('c * 'b * 'c) list -> (('a * 'c) * 'b * ('a * 'c))
<octarin>
list
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<octarin>
So, for example, if I have a bunch of (int * int * int) automatons, for which I know 0 is the init state
<octarin>
How do I construct the init state of the intersection ?
<octachron>
with "let pair init_1 init_2 = init_1, init_2" ?
<thizanne>
↓
<thizanne>
↑ and repeatedly calling pair
<octarin>
what’s the difference with my previous function ?
<thizanne>
but you can't write this for an arbitrary number (a list) of automatas
<thizanne>
because you don't know yet what will the type of the resulting automaton's states will be
<octarin>
well, that’s what I wanted to do
<thizanne>
then you'll want a list, as I suggested
<thizanne>
if you want to intersect a list of automatas, the resulting automaton states are lists
<octarin>
ok
<octarin>
so it should be inter : ('a, 'b, 'a) list -> ('a, 'b, 'a) list -> ('a list, 'b, 'a list) list
<thizanne>
yes
<octachron>
but could keed pair when the number of intersection is statically known
<octachron>
i.e. tuples for a statistically known number of intersections, and lists for when the number of automatons are not known
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<arthur_rainbow>
Hi. Apart from having true:traverse in _tags and having -r when calling ocamlbuild, is there anything else I can do to tell it to consider files in subdirectories ?
<arthur_rainbow>
I've got a file formula/Ast.ml and formula/Ast.mli, but they are not copied by ocamlbuild into _build, and I can't understand why
<arthur_rainbow>
thus, I obtain the message Error: Unbound module Ast Command exited with code 2.
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<octachron>
you probably need to add "<formula>: include"
<thizanne>
I don't have any traverse thing and I don't use -r
<thizanne>
but yeah octachron said it
<thizanne>
I have a src/ dir containing all diles, and <src>: include
<thizanne>
and <src/*>: include and <src/*/*>: include
<thizanne>
(I guess I have two subdirs nested somewhere)
<arthur_rainbow>
1) it works, so thank you
<arthur_rainbow>
2) this makes no sens. Whats the point of traverse, of -r, in this case ?
<thizanne>
I don't remember
<thizanne>
isn't it when you go upwards ?
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<arthur_rainbow>
I don't know what «upward» means here.
<arthur_rainbow>
according to documentation "If the option -r (for recursive) is passed, then all subdirectories (recursively) are considered part of the source directories by default, except the build directory and directories that look like version-control information"
<arthur_rainbow>
Well, I'll just accept that I put this magic line in _tag, and it works, thanks
<octachron>
the point of -r and traverse is that they make ocamlbuild look at the corresponding subdirectories
<octachron>
however, it does not mean that ocamlbuild knows that it should pass the "-I subdirectory" option to the compiler when building code outside of this subdirectory
<arthur_rainbow>
oh
<arthur_rainbow>
ok
<arthur_rainbow>
I guess It kind of makes sens
<arthur_rainbow>
thank you
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