Le 2 nov. 05 à 11:47, Richard Jones a écrit :

>  consider a database layer:
>
>   Database
>   Database_Postgres
>   Database_MySQL
>
> Obviously '_' is the way to go here if you want multiple third parties
> to provide database modules.  'include' wouldn't work at all here.

You are right. I think 'include' doesn't work here because there is a  
notion of choice. If I understand well your example, functors  
wouldn't help here because it is not that you want to get a unified  
interface (frontend) from a specific database implementation  
(backend), but you really want to access database specific features  
via the third party modules, right ?

Daniel