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<uucico>
is there a general-purpose print function that can print arbitrary things, similar to what the ocaml interactive interpreter does to print the computed value of whatever expression the user types in?
<def`>
no
<def`>
you need types to do something like that, and types are erased in ocaml :(
<uucico>
ah, didn't realize that. that's too bad, then, but makes sense..
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<sdegutis>
Does OCaml have something like Java's interfaces?
<joness>
ocaml installer on windows is retarded as hell.. it completely overwrites PATH environment variable, instead of just adding itself to the list
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<sdegutis>
Drup: thx
<Drup>
sdegutis: module systems is where ML like languages really shine :p
<sdegutis>
I want to declare an interface so that any type that implements a greet method taking a string (plus the implicit self argument) conforms.
<Drup>
sdegutis: yes, you write the signature of a module containing a type and a greet function and you make every module conform to this signature
<sdegutis>
This is the hardest language I've ever learned.
<sdegutis>
Or at least attempted.
<sdegutis>
Does OCaml's sum types allow associated values?
<Drup>
what is that ?
<Drup>
oh, what swift calls associated values ? :p
<natrium1970>
The problem is lies with the is_empty function. Could someone explain what changed in OCaml?
<Drup>
natrium1970: there was a regression in how generalization was done (I don't remember when)
<Drup>
natrium1970: add the argument on empty
<sdegutis>
There must be a better way of writing this function!
<sdegutis>
let sum_if_true test first second = (if test first then first else 0) + (if test second then second else 0)
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<natrium1970>
Yes, I figured out how to make it work. Do you mean that the behavior in the current OCaml compiler (4.02) is wrong for not compiling it, or the older compiler was wrong for accepting it?
<Drup>
natrium1970: I would say the new behavior is wrong because it breaks compat, but it's not new with 4.02, I think, it was done in 4.00
<Drup>
you could ask on the mailing list the details, it's related to details of the typechecker and I don't know enough to answer
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<natrium1970>
Thank you.
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<Drup>
sdegutis: there are other way, but not really better
<sdegutis>
Okay thanks.
<sdegutis>
So far OCaml is better than Go in every way.
<Drup>
how would you like to write it ?
<sdegutis>
Drup: you're right, it's fine
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<sdegutis>
Is saying 'a literally equivalent to saying T in other languages?
<Drup>
yeah
<Drup>
well, not really, but it's a good enough approximation for now
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<sdegutis>
How's it different Drup?
<Drup>
depends to which generics you are thinking of, Java-like or something else ?
<sdegutis>
Swift's
<sdegutis>
But you don't know Swift.
<sdegutis>
Whoa! OCaml has Clojure's destructuring!
<Drup>
what's Clojure's destructuring ?
<Drup>
(can you link me to the part of Swift's doc with some T in it ? :p)
<sdegutis>
Drup: and destructuring in Clojure means you can bind based on the shape of the structure, although it's really hard to explain if you're not familiar with dynamically typed languages or Lisps
<natrium1970>
Polymorphic data structures and functions look like nothing I’ve seen elsewhere, probably because of type inference. Functors remind me of Modula-3 generics.
<sdegutis>
(I just read List.map languages ~f:String.length;;)
<natrium1970>
That book and the library it uses “Core” just love labelled parameters.
<Drup>
sdegutis: what do you mean by "break" ?
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<sdegutis>
Drup: well if you have int -> int -> int, and you pass the second one first -- oh wait, you can't
<Drup>
sure you can
<Drup>
fun x -> f x 3
<sdegutis>
I meant *without* passing the first one.
<sdegutis>
Oh right.
<sdegutis>
But that's not what I meant ;)
<sdegutis>
But yes you're right.
<Drup>
(note that it's not currying, it's partial application)
<Drup>
(currying is transforming a function of type int -> int -> int to int * int -> int)
<Drup>
(or the opposite, I never remember which direction it is)
<sdegutis>
Sure.
<sdegutis>
I'm only half-way down the "A Guided Tour" chapter.
<sdegutis>
After this there's still 11 more chapters :'(
<sdegutis>
Does OCaml automatically use Option when you call into C libraries?
<sdegutis>
(To represent that a pointer may be None or Some)
<Drup>
No, that's your job to give a sensible OCaml type to C functions
<Drup>
giving an option type to a pointer is not always appropriate, depending of the library you are binding
<sdegutis>
Thanks Drup.
<sdegutis>
Can you pass 3 to a function taking int option, instead of Some 3?
<Drup>
no
<sdegutis>
:'(
<Drup>
but you can use optional arguments to do something like that
<sdegutis>
Well I'm not so concerned about arguments.
<sdegutis>
Just in general where int option is expected.
<sdegutis>
e.g. also int option list.
<Drup>
There is no such thing as automatic coercion in ocaml :p
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<sdegutis>
well yay i guess
<Drup>
(which in turns allows the type inference to be complete, btw)
<blech_>
on the plus side you never have to deal with null
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<sdegutis>
blech_: wooooooo
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<sdegutis>
Drup: wooooo
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<sdegutis>
Do you often find yourself writing custom sum types for functions to represent all the different states it can return?
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<companion_cube>
sdegutis: it happens, yeah
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<jeroud>
Is there a tool for indenting menhir parsers?
<jeroud>
I have emacs using ocp-indent, but my .mly files are being mangled.
<def`>
never heard of a tool for that :'
<def`>
I do it manually in vim, using ocp-indent for ocaml parts, and some vim macros/shortcuts for menhir specific syntax
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<Leonidas>
sdegutis: yes. or if there's a lot of possibilities, then polynorphic variants
<jeroud>
Ah. :-(
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<sdegutis>
What are constructors commonly named for custom types in OCaml?
<def`>
Hmm, any name that reflect the concepts you are working on is fine :P
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<sdegutis>
Oh.
<sdegutis>
I saw create() in the Real World OCaml book and wondered if that's what people usually use.
<mrvn>
make is common
<sdegutis>
Wait, you can make new operators in OCaml?
<sdegutis>
I just read "let (!) r = r.contents" in RWO.
<mrvn>
everything begining with an operator char is an operator
<whitequark>
let (>_<) = 1
<whitequark>
(sadly, not, but I wish it would be possible)
<mcc>
is _ an operator?
<whitequark>
no, it's not an operator character
<mcc>
ok
<whitequark>
I was trying to be funny
<sdegutis>
So you can make your own operators?
<mrvn>
# let (><) = 1;;
<mrvn>
val ( >< ) : int = 1
<def`>
:)
<mrvn>
sdegutis: yes
<whitequark>
sdegutis: yeah, any value with a name consisting only of operator characters is an operator
<sdegutis>
So cool.
<whitequark>
its arity, fixity and associativity depends on the first character
<sdegutis>
Oh.
<sdegutis>
Neat.
<mrvn>
let (+++++++++++++) x y = x + y (* realy, realy, realy the sum of 2 ints *)
<whitequark>
let (=^-^=)
<sdegutis>
I think this is my new favorite language.
<flux>
let (++) x y z = x + + yz (* ;-) *)
<mcc>
it is a pretty darn cool language
<whitequark>
now *that* is valid ocaml, mcc :]
<sdegutis>
And I've only read (most of) chapter 1.
<sdegutis>
I am excited to rewrite my OS X window manager in OCaml.
<whitequark>
i even have that operator used somewhere
<whitequark>
mcc: oh, btw, do you still have windows troubles?
<mrvn>
whitequark: Is that the local minimum operator?
<mcc>
whitequark: yes, i had someone complain about windows troubles earlier this week, and i did not get a chance to talk to them, instead i launched off to oklahoma...
<whitequark>
mrvn: it's supposed to be a cat smiley
<sdegutis>
What's wrong with OCaml's standard library?
<mcc>
whitequark: i haven't tried to build anything on windows yet myself.
<blech_>
sdegutis, I felt the same way when I first learned it
<whitequark>
sdegutis: tiny
<sdegutis>
Like Lua's?
<sdegutis>
I'm cool with that.
<whitequark>
a bit bigger than Lua's
<sdegutis>
Even better.
<sdegutis>
I'll just hand-roll the functions I need for now if it doesn't have them.
<blech_>
you can read through the entire standard library in an afternoon
<mcc>
whitequark: but the upshot was, however one goes about installing packages on ocaml is manual/undocumented enough a random uninitiate couldn't figur eit out, which is too bad cuz i want ppl building my project to be easy...
<sdegutis>
blech_: source or interface?
<mcc>
hey, i have an ocamlbuild question
<blech_>
sdegutis, the bit about ocaml becoming a favorite language
<sdegutis>
blech_: I meant can you read through the entire stdlib's source or docs in one afternoon?
<blech_>
docs for sure, though I wouldn't be surprised if you could do the source too
<mcc>
so i have in my _tags "<*>: package(sedlex, containers)" ... however, i want to start using my own personal fork of sedlex, not the system one, and i'd like this to be in some kind of sensible way that doesn't require the user to break their system
<dmbaturin>
sdegutis: StandardML allows creating infix constructors and operators with arbitrary names, but user-defined infixness and associativity don't work well with the module system.
<mcc>
ideally, i think, i'd like to make my sedlex version be a subrepo (i think git users call this a submodule) of my main repository, and tell _tags to load sedlex out of this local folder rather than out of the standard library
<ggole>
I wouldn't care to understand printf, personally
<mcc>
what is the sensible way to do this?
<mcc>
dmbaturin: how so?
<ggole>
Although now I think about it, the last time I looked was before the GADT rewrite.
<ggole>
Might be less Objy now.
<sdegutis>
dmbaturin: I don't know what StandardML is.
<mcc>
dmbaturin: does SML not have modules?
<mcc>
sdegutis: it is the version of ML people liked to use before OCaml became popular.
<sdegutis>
So I don't have to care or know about it, right?
<mcc>
sdegutis: standardML, ocaML
<mcc>
sdegutis: nope! just expect anyone who learned ML in the 90s to mention it occasionally.
<blech_>
and IIRC you toss caml light somewhere in there
<sdegutis>
I can just learn OCaml and be fine?
<mcc>
people seem to be standardizing on ocaml very hard, yes.
<mcc>
hey whitequark, if your unicode patch gets accepted, will i be able to make unicode operators? how will the fixity work?
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<ggole>
Being aware of the history isn't without value, but you won't need to know anything about SML to program in OCaml.
<dmbaturin>
mcc: It does, there are just problems with importing infixness and associativity without opening the module; I think it's the reason ocaml made it defined by the first character.
<mcc>
dmaturin: makes a lot of sense
<whitequark>
mcc: it won't
<mcc>
whitequark: 'k. do you think that might be something that can come later?
<sdegutis>
OCaml is making me feel like Clojure is just a simple toy project.
<whitequark>
it doesn't look like the patch will be accepted
<sdegutis>
And it makes me wonder why I'd ever want to use Ruby again.
<whitequark>
sdegutis: typed clojure is nice.
<mcc>
clojure is deployable in ways ocaml is not afaict...
<dmbaturin>
mcc: Also, I learnt SML _after_ ocaml because I was curious what the other ML is like. :)
<mcc>
whitequark: i wanna define a • operator that brings back SML's o operator (haskell .)
<whitequark>
mcc: arguably, building three static binaries on CI is "deployable"
<whitequark>
mcc: well.
<mcc>
whitequark: i guess i should just start hunting for a sensible character to use for that.
<sdegutis>
whitequark: Typed Clojure feels like a frankenstein project.
<sdegutis>
whitequark: adding pseudo static typing to a dynamic typed language feels so weird
<mcc>
whitequark: also, oh, why are they going to not accept the unicode patch? :O
<sdegutis>
mcc: sure, Clojure has JVM, but meh
<whitequark>
mcc: ask gasche
<sdegutis>
compile and run is sufficient deployment for me
<whitequark>
mcc: regarding the operator, hm, I'm currently reusing the ocaml's parser
<whitequark>
let me look at it a bit closer
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<mcc>
sdegutis: also the CLR, which is more important to me. if you want to take ocaml to the CLR you have to port it to F# last i heard
<mcc>
what i really care about is Unity.
* mcc
deploys to weird places.
<sdegutis>
mcc: meh, I just deploy to unix so I'm fine
<mcc>
You'd think a language developed by french people would be more enthusiastic about getting to use ç
<sdegutis>
My personal website's payment handler is a small Ruby/Sinatra program I think.
<sdegutis>
(to handle Stripe payments)
<whitequark>
mcc: ocaml currently interprets filenames as latin-1.
<whitequark>
and identifiers too.
<whitequark>
this will be fixed in 4.03.
<mcc>
whitequark: ah. so french is covered?
<sdegutis>
I like Real World OCaml a lot so far, but I won't be using Core any time soon so it's frustrating that the book uses Core so pervasively.
<whitequark>
mcc: yes, but it's broken
<whitequark>
because no reasonable OS uses latin-1
<mcc>
odd
<mcc>
haha
<whitequark>
and on OS X I don't think you even *can* do it on HFS+
<whitequark>
so it's broken on OS X and non-French Windows installs, and essentially all modern Linuxes.
<sdegutis>
Why doesnt OCaml use UTF8?
<mcc>
i don't see why not, it's just bytes right?
<sdegutis>
is it cuz its so old?
<whitequark>
well, casefolding.
<sdegutis>
oh
<whitequark>
it tries to casefold utf-8, too
<sdegutis>
uh
<whitequark>
and fails
<mcc>
ooo…
<mcc>
which screws you on module names?
<whitequark>
yes.
<mcc>
'k
<whitequark>
almost all this crap was removed in 4.03
<whitequark>
my personal view is that m17n is not worse, and indeed probably better (as it reuses the parser) than camlp4, and camlp4 was found acceptable
<whitequark>
thus m17n would also be acceptable
<whitequark>
and it handles essentially all edge cases in unicode, too
* mcc
nods
<whitequark>
anyway, to answer your original question
<whitequark>
it would be trivially simple to define another operators with same priority as some preexisting operators
<whitequark>
i.e. · with the priority of @
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<mcc>
whitequark: would that mean you'd have to pick priority/arity/assoc for all those symbols ahead of time?
<whitequark>
I honestly have no idea how to extend it nicely, you're welcome to leave suggestions
<mcc>
OK.
<mcc>
whitequark, by the way, did you see my question a few minutes ago about using a custom sedlex in Emily? maybe i should just pin my local sedlex in opam and let the repo be broken until my patches are accepted or rejected...
<whitequark>
I did not
<whitequark>
pinning is what people usually do
<whitequark>
wrt sedlex, pester Drup until he yields
<whitequark>
maybe I should just take over sedlex maintenance myself, I use it a lot
<dmbaturin>
mcc: I was about to build emily. Is it "broken" already or will be soon and current snapshot should work?
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<mcc>
dmbaturin: just build stable.
<mcc>
or, well, you don't need to do that.
<mcc>
dmbaturin: there is a "master" branch and a "stable" branch (bookmarks on bitbucket). "master" is development, "stable" is "last released version" (I'll document this soon)
<mcc>
whitequark: well, even if he took the patch, i'm gonna be playing with the other sedlex patch a bit before i push it
<mcc>
dmbaturin: let's just say if i break the build i'll wait to push to the repository until it's fixed again.
<mcc>
dmbaturin: so you don't need to worry
<mcc>
if this ever becomes a real open source project i should only be adding to master via pull request anyway :P
<dmbaturin>
mcc: In git I usually tag "logical milestones". Does hg have tags?
<mcc>
hg has tags. what do you mean "logical"?
<mcc>
(there *is* a github clone-- i'm only using hg features that hg-git can map to git concepts)
<blech_>
mcc: I think they mean arbitrary points rather than merges or such?
<dmbaturin>
Well, points when something I was going to make work finally works. :)
<mcc>
oh, that's interesting
<mcc>
so mercurial has something called a "bookmark" which is like a movable tag. conceptually it works exactly like git branch heads, but the UI is a little more lightweight, so i tend to use them a little more casually than git users seem to use branches maybe.
<dmbaturin>
So if I want someone else to try that I can suggest to checkout specific tag,
<mcc>
if you use hg-git (i do), the bookmarks are literally converted to branches
<dmbaturin>
I probably should learn about hg some day.
<whitequark>
mcc: wait, you use hg-git? wouldn't that defeat the point of using hg
<mcc>
whitequark: don't understand the question
<whitequark>
hg-git has the interface of what?
<whitequark>
user-facing
<mcc>
hg-git is a mercurial plugin which allows you to push and pull to git repositories from hg. it does not change the interface to hg at all.
<whitequark>
oh, disregard the question
<mcc>
( and my patch that WOULD have slightly extended the interface was never accepted :P )
<mcc>
whitequark: there was a second module called hgit, i think, written by the same maintainer, that you might have been thinking of
<mcc>
i don't think it was ever finished
<whitequark>
NOT CONFUSING NAMING AT ALL
<mcc>
yes, i'm not happy with this.
<mcc>
especially because hg-git is the name of the project but hggit is the name of the plugin from the perspective of the mercurial plugin loader.
<blech_>
there's a hyphen. What's the problem? They even tossed in a g for you
<blech_>
for (g)ood measure
<mcc>
so you check out hg-git the project and there is a folder inside named hggit, and when you submit patches the maintainer rambles about how he's about to dump the whole thing for hgit...
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<mcc>
oh, and you can imagine how difficult it is to have an in-person conversation with someone in which you attempt to mention hg-git
<mcc>
i usually just call it "the git-mercurial bridge"
<mcc>
otherwise it's "well, i used hig git…"
<mcc>
anyway.
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<ggole>
Sounds like a hiccup.
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<dmbaturin>
At least you do have opportunities to discuss such things with people in person. ;)
<mcc>
Only when I need to embarrassedly explain to people at work why I cannot help them with their git problem.
<mcc>
whitequark: so you're familiar with sedlex internals... can you help me understand the difference between marked_pos and marked_val? marked_pos is "if we backtrack, we'll go to here", marked_val is for some kind of feature where the end user can mark a special place for backtracking?
<mcc>
i'm asking in part because it looks like "refill" adjusts the positions of pos and marked_pos but not marked_val, which seems… like a bug
<whitequark>
so, "pos" is the stream position
<whitequark>
and "val" is the saved lexer state at that position
<mcc>
oh! but it's an int?
<mcc>
so it's actually a codepoint?
<whitequark>
um, I don't think it's a codepoint
<whitequark>
it's the number of state in the internal DFA, I think
<mcc>
i see.
<mcc>
maybe i'll… go ahead and give that a type or something.
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<ggole>
val is such a descriptive word.
<whitequark>
lol
<ggole>
No really, it could describe almost anything.
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<def`>
especially in a functional language :P
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<MercurialAlchemi>
ugh, you can really OCaml's codebase is not that young
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<justinfront>
Error: Multiple definition of the extension constructor name Error. Is there a switch or something that I need, I think I must be using newer ocaml with older code?
<ggole>
justinfront: which version are you using?
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<justinfront>
The OCaml toplevel, version 4.03.0+dev5-2014-10-15
<justinfront>
if I change it to Error2 then it works but unsure if that ok
<Leonidas>
(that is just a git mirror of the original camlzip, because I can't be bothered to use SVN)
<ggole>
Hmm, repeating the constructor works for my 4.03
<ggole>
But my 4.03 is a bit old. I'd say you are looking at a very recent change.
<mcc>
whitequark: sorry to bother again-- marked_val is initialized to 0 at lexbuf creation, then when "start" is called it's set to -1. I'm wandering around the code but I cannot find any indication what the meaning of -1 is for a state.
<mcc>
whitequark: errrr.... i asked that question but now i have to disappear. sorry.
* mcc
is hanging around a hotel lobby >_>
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<ggole>
justinfront: you should be able to simply delete the redundant exception definition, since they are the same
<ggole>
Unless you're relying on uniqueness or something
<justinfront>
if I delete the first one line 18 I get an error else where
<ggole>
No, remove the later one
<ggole>
On 76
<justinfront>
ok thanks
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<justinfront>
It can't seem to find camlp4o command not found
<ggole>
Did you install camlp4?
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<justinfront>
Ok just getting it from git.
<justinfront>
thanks it used to be in ocaml before?
<Drup>
whitequark: let me be overworked for a few days before merging patches, would you ?
<ggole>
justinfront: yeah, that changed recently
<ggole>
justinfront: are you using opam?
<justinfront>
from memory I don't think Nicolas likes opam but I might be muddling it from something else but I don't think haxe complier uses that?
<justinfront>
File "camlp4/boot/Camlp4.ml", line 14857, characters 34-42:
<justinfront>
Error: Unbound constructor Labelled
<justinfront>
Command exited with code 2.
<justinfront>
make: *** [byte] Error 10
<justinfront>
Justins-MacBook-Pro:camlp4
<Drup>
justinfront: you are using ocaml trunk, don't be surprised if some things are broken.
<ggole>
Yeah, latest release might be a better idea
<justinfront>
I am not surprised just sometimes get fed up with macports and in the past I found ocmal from git easier
<Drup>
you can get ocaml from git if you want, just use stable versions
<justinfront>
seems separating ocaml and camlp4 means that they are not unit tested together?
<justinfront>
I could try making ocaml again I looked at the line it looks much the same as the line after
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<Leonidas>
camlp4 was separated out so it can be safely be dumped and deprecated :)
<MercurialAlchemi>
secondly, it's confusing enough that utop seems to give up on it
<Drup>
justinfront: camlp5 is the *ancestor* of camlp4 (yes, it's confusing)
<justinfront>
oh ah.
<mcc>
do you think there will ever be a camlp3
<Drup>
justinfront: really, you should install with opam, stop banking your head against the wall
<Drup>
ganing*
<MercurialAlchemi>
mcc: hopefully not
<Drup>
grrmbl.
<Drup>
banging*
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<justinfront>
so is campl4 used in haxe for creating the AST ?
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<Drup>
You should ask haxe specific question on the haxe channel, I think most people here are not familiar with it
<justinfront>
fair enough just fustrated that git ocaml I built not long ago does not seem to be compatible with campl4 git which are both required currently.
<mcc>
the people in the haxe channel see helpful in my experience
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<justinfront>
sure, I can get it another way just often prefer building it myself but not done it since changing machines.
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<Leonidas>
justinfront: or you could just install caml 4.02.1 and camlp4 4.02.1 and it would just work.
<Leonidas>
no idea why you desperately try to make your life complicated
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<oriba>
just trying to use opam
<oriba>
my first steps dont look very successful
<oriba>
how do I list the packages that are available in the repositories?
<oriba>
opam list only shows downloaded stuff
<oriba>
for example, how do I install a ocaml compiler?
<vanila>
i thought i installed other ocaml versions using opam
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<oriba>
ah, I have to use "opam switch" instead of "opam install"... I thought first install, then switch
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<oriba>
yay, thats nice, I now have ocaml 4.02.1 on a server, where they have ocaml 3.12.1 installed :-)
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<oriba>
oh, really easy to install things... thats nice
<oriba>
but one package I need is not available :-(
<oriba>
too bad
<oriba>
can system-installs and local installs be mixed?
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<Drup>
not really
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<oriba>
hmhh
<Drup>
first because, as you said, your system install is with 3.12 and the local with 4.02
<oriba>
ah, hmhh#
<oriba>
maybe native code...
<oriba>
maybe I should compile to native at my laptop and try if it runs on the server ;-)
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<oriba>
shared libs problem..... shit
<oriba>
the lib installed by hand installs itself into opam-dir! :-)
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<oriba>
but can't be found :-(
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<Leonidas>
when I have a function that returns `Foo or `Bar, how can I specify in the signatur file that only `Foo and `Bar are allowed but not more? I thought [`Foo | `Bar] would work, but that seems to work even when it cannot return `Bar
<Leonidas>
mrvn: this can't return bot_error, but when I say [ topic_error | bot_error ] it gets accepted just fine.
<Leonidas>
*topic_result
<mrvn>
Leonidas: and the problem is?
<Leonidas>
mrvn: I would like it to error if I say [ topic_error | bot_error ] in the sig as this is just wrong.
<Drup>
Leonidas: it's how poly variants work. think of a polymorphic variant as (inclusion relations on) sets of variants. The return of your function is clearly inside the set [ topic_error | bot_error ].
<Leonidas>
Drup: so there is no difference between [> foo | bar ] and [ foo | bar ]?
<mrvn>
yes there is.
<mrvn>
[> means it can be bigger
<Drup>
there is a difference, baz is inside the first but not the second.
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<Leonidas>
so there is no way to say, "I know exactly which polymorphic variants are the result", please warn me if the code and the signature disagree?
<Drup>
it will warn you for some kind of disagreement, but not "lack of variant returned".
<Leonidas>
okay
<Leonidas>
that's a bit disappointing
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<chouser>
Anyone care to help me get the right syntax to define a parameterized type with more than one parameter?
<chouser>
I was hoping: type 'a 'b foo = { x : 'a; y : 'b} ...but no
<Drup>
chouser: "type ('a,'b) foo ..."
<chouser>
Drup: perfect. thanks! Coulda sworn I tried that, but apparently not. :-P
<chouser>
Also, is there any way to define mutually-recursive types?
<def`>
type t = ... and u = ...
<chouser>
Wow, I should have come hear earlier. Thanks!
<chouser>
Does that work with module parameters as well?
<Drup>
yes
<Drup>
oh, wait, module parameters ? what do you mean ?
<chouser>
It's possible what I want to do doesn't make sense. I'm very new to this.
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<chouser>
But I'm thinking something like: module MyMap = Map.Make (Foo) and Foo = FooMap of MyMap.t
<chouser>
or should that be: type Foo = FooMap of MyMap.t
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<Drup>
that doesn't really make sens.
<Drup>
first, Foo should be foo, since it's a type.
<chouser>
ah yes, right.
<Drup>
second, Map.Make takes a module, not a type, so you need a bit more
<Drup>
third, this is a map that takes map as parameters ? You have a bit of a recursivity issue there :p
<chouser>
oh right, comparison functions and such.
<chouser>
yes, the idea is very much recursive. A map whose keys are maps.
<Drup>
but the same type of maps ?
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<Drup>
well, you can always start with empty maps, but still, it's weird :D
<chouser>
Yes. Well, actually a variant that might be the same kind of map.
<chouser>
But I've got to get my struct for Map.Make right first. If I can't figure it out from there, I'll be back. :-)
<chouser>
oh, that comparison function is going to demand a total ordering across my whole variant. Hm.
<Drup>
(you can cheat and use "compare" at first)
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<chouser>
hm! I'll try that
<chouser>
brilliant!
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<def`>
chouser: recursive modules allow you to do recursive maps
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<chouser>
Hm, ok. I might not need that.
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<chouser>
Thanks you all for your help, I really appreciate it. I'll be back later.