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Date: Thu, 27 May 2004 23:11:34 +0200
From: szegedy@t-online.de (Christian Szegedy)
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Subject: Re: [Caml-list] Looking for collaborators on a hobby project
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Dear Skaller!

Is the Vyper project public?

I could not find any version of Vyper on the net. :(

You have written, that the analyis of the type information
turned out be difficult. I can believe this. :)

However, this is something already solved. In fact,
this is solved in Ocaml! So, I would not have to solve it
directly.

Now, my idea is the following:

Suppose, we have the following Ruby class:

class A
   def f(x,y)
      x.g(y,@a)
   end
  
   def h(x)
       f(@b,v)
   end
end

Then the interpreter  would simply transform it to the following OCaml 
class:


type 'a myref = Nil | Obj of 'a

let use x = match x with
| Obj x -> x
| Nil -> failwith "Dereferencing nil"


class ['f_x,'f_y,'h_x,'a,'b] a =
object(self)
  val mutable a:('a myref) = Nil
  val mutable b:('b myref) = Nil
  method f ( x : 'f_x) (y : 'f_y) = (use x)#g y a
  method h ( v : 'f_x)  = self#f b v
end

After that, OCaml would take care of all the typing stuff...

Of course using the myref class comes with a performance penalty also.
This can be eliminated if one does not allow nil at all: that is all
instance variables must have valid default value.
I think, this is a good idea anyway...



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