Re: [Caml-list] Implicit parameters (was Future of labels)

[Markus Mottl <mottl@miss.wu-wien.ac.at>]

On Fri, 30 Mar 2001, Jacques Garrigue wrote:
> You can easily do dynamic scoping in ML (contrary to Haskell), by
> using references. The only pitfall is that the produced code is not
> reentrant.

Another solution to this problem is to use a state monad that passes
around the parameter implicitly. This would also keep the code purely
functional (= reentrant).

The only problem here is that using monads in their general form with
OCaml is usually more cumbersome than with Haskell due to the lack
of overloading. It's also a quite bit slower than passing around the
parameter explicitly.

For those who want to see an example of the use of state monads and to
compare with a solution that passes around the state parameter explicitly,
you can take a look at the following:

  http://www.oefai.at/~markus/ocaml_sources/IMP-1.0-3.tar.gz

Regards,
Markus Mottl

-- 
Markus Mottl, mottl@miss.wu-wien.ac.at, http://miss.wu-wien.ac.at/~mottl
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