gl changed the topic of #ocaml to: OCaml 3.07 ! -- Archive of Caml Weekly News: http://pauillac.inria.fr/~aschmitt/cwn , A tutorial: http://merjis.com/richj/computers/ocaml/tutorial/ , A free book: http://cristal.inria.fr/~remy/cours/appsem, Mailing List (best ml ever for any computer language): http://caml.inria.fr/bin/wilma/caml-list | http://icfpcontest.org/ !!
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<Snark> slt
<det> hello
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<Axioplase> Chat Lu!
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<slashvar> Yop
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<buggs> i tried ocaml for the contest and i must say i'm rather pleased with language
<buggs> the objects could be a lot more user friendly though
<buggs> what somehow need was something like a Nil object
<buggs> +i needed
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<monotonom> That opens a can of worms, doesn't it
<buggs> you end up making virtual classes, subclassing it by one real class and it's corresponding Nil one
<buggs> i'm trying to get ppl to tell me how to work without
<buggs> then i find my self writing a lot of:
<buggs> val mutable x = foo
<buggs> method x = x
<buggs> method set_x y = x <- y
<buggs> is there a better way ?
<monotonom> Yes. Records.
<buggs> inst#rec.x or is ther better ?
<buggs> is the way with the nil object above ok or is there also a better way to that ?
<monotonom> What is a "nil object"?
<buggs> like for the contest task i have a virtual ant_t, and subclasses ant and no_ant
<buggs> no_ant is what i call nil object
<monotonom> No wonder I have never heard of "nil object".
<buggs> say in the above x shall not be initialized how do i do that ?
<buggs> val mutable x = nil
<buggs> later
<buggs> inst#set_x (new Ant)
<monotonom> In my opinion the only time in OOP you want to leave a field uninitialized is when you use the singleton pattern with postponed creation, and that case is already covered elegantly by the Some type. The Some type is ugly for other cases, but there are no other cases.
<Smerdyakov> monotonom, the option type
<monotonom> Yeah, s/Some/option/
<buggs> ya but there was a map that contained cells and my cells had a method get_ant that returned an IF there was one
<buggs> now on initalizing the cell i wanted the ant to be nil
<buggs> only when an ant steped on it the cell had an ant
<buggs> so i did the above with the virtual class and the two subclasses
<buggs> i saw that in other code too but i wonder if there is another way
<monotonom> Can there be many ants on the same cell? I would use the option type if at most one ant can be on a cell, or a set if any number of ants can be on a cell.
<monotonom> Alternatively if global_number_of_ants << map_size, I would use a sparse representation of the map and sidestep the issue altogether.
<buggs> only one ant at a cell at a time
<buggs> but it seemed classes coudn't be used as types
<buggs> maybe i did that wrong
<buggs> let y : foo option = new foo;;
<buggs> doesn't work
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<monotonom> let y : foo option = Some (new foo);;
<monotonom> let y : foo option = None;;
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<Snark> good night
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