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<electricfeel>
I am trying to create an opentype: http://codepad.org/YWT1SPED in this snippet, I'd like the parameters 'a and 'b to be open... so that the datastructure isnt limited to a certain pair of types
<electricfeel>
i'm not quite sure what the syntax is..
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<electricfeel>
Actually, I guess what I'm trying to do is kinda stupid.
<electricfeel>
Comparing a key that is a string with a key that is an int doesn't make any sense.
<electricfeel>
Since the tree I'm using is a BST
<electricfeel>
Well, let's say I changed that so it's just a binary tree, so there are no comparisons being made. I'd still ike to make the dictionary type "open", so that once it is instantiated, it is not exclusive to one 'a 'b type
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<electricfeel>
Probably too noobish of a question for this channel :-S
<thelema>
well, if electricfeel comes back, let him know that he can't make open types in ocaml - functions can only return values of a fixed type or one parameterized by the type of that function's arguments.
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<thelema>
what he's doing is exactly what ocaml allows you to do.
<thelema>
(based on his last paste)
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<flux>
oh, cool, codepad runs also ocaml code
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<electricfeel>
I have a question about "open" types: http://codepad.org/9S65uQ4p . I've provided a very concise summary of what I'm trying to do in the paste.
<electricfeel>
(* E.g. if i had a function add: (’key, ’value) dictionary -> ’key -> ’value -> (’key, ’value) dictionary *)
<electricfeel>
(* I'd like to be able to add (string, int) and (int, string) and (string, string), etc to the same dictionary object. *)
<electricfeel>
Sorry for the double line paste...
<flux>
you would need to have type key_value = StrStr of (string * string) | IntStr of (int * string) etc
<flux>
there are ways to have dynamic types in ocaml, for instance by using the exception system
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<malc_>
06:32 < thelema> well, if electricfeel comes back, let him know that he can't make open types in ocaml - functions can only return values of a fixed type or one parameterized by the type of that function's arguments.
<malc_>
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<malc_>
06:33 < thelema> what he's doing is exactly what ocaml allows you to do.
<malc_>
06:33 < thelema> (based on his last paste)
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<electricfeel>
ah
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<electricfeel>
I was reaidng the Hickey book and noticed that there is a type called "option", which includes None and anything not None.
<hcarty>
electricfeel: The type is 'a option, and 'a can only be one type for a given value (int option list, for example)
<hcarty>
electricfeel: Otherwise you have to use flux's suggestion
<electricfeel>
I see. Thanks for the tips.
<hcarty>
electricfeel: OCaml does not keep type information around, for the most part, in the compiled code. So having different items in a list (or array or other structure) wouldn't be safe without extra scaffolding
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<mrvn>
re
<mrvn>
det: The C part allocates a tuple and returns it as abstract type "context". The other functions then all get a context as first argument.
<mrvn>
hcarty, flux: How does that work with exceptions?
<mrvn>
electricfeel: You might replace 'key with (Hashtbl.hash <key>) : int if you want to store different keys.
<hcarty>
mrvn: I have not used exceptions that way, but I think Yoric[DT] did some work along those lines
<mrvn>
As for different values there is also the option of using classes. But that only makes sense when you have common method for the different types you want to store.
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<mrvn>
I have a verry similar case in my code. But for me the 'key part determines what the 'value part is. Is there anything better than type key = FooKey of int | BarKey of int type value = FooVal of foo or BarVal of bar?
<mrvn>
I have values only in leafes though. So I can't combine them into a single type.
<mrvn>
.oO( Maybe I should change that )
<gildor>
mrvn: I see that you pick "GPL license" for libaio-ocaml
<gildor>
mrvn: could you use a more open license (e.g. LGPL + exception)
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<mrvn>
gildor: sure
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<mrvn>
Just checked, libaio itself is lgpl too.
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<Anarchos>
thelema i finally succeeded in splitting the local roots per thread :)
<Anarchos>
thelema anyway it works for a one thread job, like the ocaml compiler ;)
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<electricfeel>
i'm really liking OCaml. I come from a C/Pyton/Java background. This is my first serious foray into functional programming (the only ohter was with Lisp when I took an AI course last semester)
<electricfeel>
I just didnt feel comfortable using Common Lisp :-)
<vixey>
so you liked ocaml more because of the typing discipline?
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