Nick Name [Thursday 19 June 2003] :
 > Hi all,
 > 
 > I wish to declare a type like
 > 
 > type a = A of (b -> unit) | ...
 > 
 > where b is a class like
 > 
 > class b = 
 > object (this)
 > 	method f : a -> unit = 
 > 		function 
 > 		  A f -> f this
 >                 | _ -> unit
 > end
 > 
 > or, alternatively:
 > 
 > class b =
 > object 
 >    inherit [a] otherclass
 >    ...
 > end
 > 
 > How can I do such a thing, considering that I can't write an "and"
 > keyword between a type declaration and a class (or class type)
 > declaration?

You could add a type parameter in your definition of a :

  type 'a a = A of ('a -> unit) | ...

and then

  class b = object (this : 'a) method f : 'a a -> unit = ... end

or

  class b = object method f : b a -> unit = ... end

and eventually redefine a :

type a = b a

-- 
   Olivier

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