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RE: [Caml-list] Does this function exist?
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Date: -- (:)
From: Gurr, David (MED, self) <David.Gurr@m...>
Subject: RE: [Caml-list] Does this function exist?


> -----Original Message-----
> From: Florian Hars [mailto:florian@hars.de]
> Sent: Tuesday, September 17, 2002 10:18 AM
> To: Kontra, Gergely
> Cc: caml-list@inria.fr
> Subject: Re: [Caml-list] Does this function exist?
> 
> 
> Kontra, Gergely wrote:
> > BTW allowing polimorphism doesn't solve the problem? 
> 
> No
> 
>  > Ocaml is strictly
> > typed, so one can figure out it's parameter in compile-type, right?
> 
> Yes. This is why such a beast as requested at the start of 
> this thread can't be
> implemented as a function, but only with some serious 
> compiler magic (that 
> breaks separate compilation) like the toplevel does.

How does the toploop break separate compilation?  The toploop
is not magic and any user program that needs the same 
functionality (like a debugger) could do the same.

> 
> How would you compile a module like:
> 
> type verbose_list 'a = Nil | Cons of 'a * 'a verbose_list
> let cons elt l =
> 	print_string "Consing element ";
> 	print elt;
> 	print_string " to list ";
> 	print l;
> 	print_newline ();
> 	Cons (elt, l)
> 
> when all you know about elt at compile time is that it is 
> completly polymorphic?

The same way that F# knows it.  F# has separate compilation.
Or Java, or C#, or Smalltalk, or Perl.  Not that that I 
believe that that is a "good thing".

-D

> 
> Yours, Florian Hars.
> 
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