Re: [Caml-list] Conditional Modules

[Richard Jones <rich@annexia.org>]

On Wed, Aug 04, 2004 at 03:58:50PM +0100, Ross Duncan wrote:
> Forgive me for asking what might be an easy question, I am just a 
> beginner with Ocaml.  I want to do something like this:
> 
> module M = if arg then M1 else M2
> module A = F (M)
> (* define rest of program using fields of A *)
> 
> The idea being that arg will come from e.g. the command line, and 
> modules M1, M2 and functor F are defined elsewhere.

I suspect that the only way to do it would be with pa_macro.cmo (part
of Camlp4).  This means it would be done at compile time, which is
probably not what you wanted.

http://caml.inria.fr/camlp4/manual/manual002.html#toc1

(BTW: What is the difference between pa_macro and pa_ifdef?  I have
both on my system, and they appear to do much the same thing.)

Rich.

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