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Date: Mon, 22 Mar 2004 11:18:05 +0100
From: Alex Baretta <alex@baretta.com>
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To: Ocaml <caml-list@inria.fr>
Subject: [Caml-list] Delegation based OO
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Away from politics and back to the ordinary stuff...

Presently Ocaml supports the following OO paradigm:

class does_something = object .. end

class does_more = object
   inherit does_something
   ...
end

This allows us to extend the functionality of CLASSES. What about 
extending the functionality of objects?

class *type* does_something = object ... end

class does_more (an_object:#does_something) = object
   delegates an_object
   ...
end

This is very important to me because in my code I often use the concept 
of proxy-object.

let prototype = match whatever with
   | ... as first_case -> new does_it_the_first_way
   | ... as second_case -> new does_it_the_second_way
   | ... as third_case -> new does_it_the_third_way

class does_more prototype = object
   method one = prototype # one
   method two = protype # two
   ...
end

This is really a pain. I would expect delegation to be supported in the 
coolest OO language under the sun ;)

O great Caml breeders, what do you say to this?

Alex

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