From: Markus Mottl <markus@oefai.at>
To: "Krishnaswami, Neel" <neelk@cswcasa.com>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Polymorphic Variants and Number Parameterized Typ es
Date: Mon, 29 Apr 2002 15:33:23 +0200 [thread overview]
Message-ID: <20020429133322.GE25953@kiefer.ai.univie.ac.at> (raw)
In-Reply-To: <B1E4D3274D57D411BE8400D0B783FF32A8D72B@exchange1.cswv.com>
On Mon, 29 Apr 2002, Krishnaswami, Neel wrote:
> There's no recursion in the module system because that would break
> the termination guarantee.
We currently don't have this guarantee anyway:
---------------------------------------------------------------------------
module type I =
sig
module type A
module F :
functor(X :
sig
module type A = A
module F : functor(X : A) -> sig end
end) -> sig end
end
module type J =
sig
module type A = I
module F : functor(X : I) -> sig end
end
(* Try to check J <= I *)
module Loop(X : J) = (X : I)
---------------------------------------------------------------------------
> If you think of modules as records, and functors as lambda abstractions,
> you can see that the module system defines a simply-typed lambda
> calculus. As you've noticed with C++, adding recursion to it would
> mean you can write nonterminating module expressions. (All this is
> wonderfully clearly explained in the paper, "A modular module system".)
I'd really like to see Claudio Russo's generalizations of the ML-module
system in OCaml. Especially first class modules would come really handy
to me in some situations. Any news on this front?
Regards,
Markus Mottl
--
Markus Mottl markus@oefai.at
Austrian Research Institute
for Artificial Intelligence http://www.oefai.at/~markus
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next prev parent reply other threads:[~2002-04-29 13:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-29 12:55 Krishnaswami, Neel
2002-04-29 13:28 ` Pascal Cuoq
2002-04-29 13:33 ` Markus Mottl [this message]
2002-04-29 13:35 Krishnaswami, Neel
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