[Caml-list] examples of heterogenous collections (containers ?)

[briand@aracnet.com]

I'm embarking on that most typical of ewexamples, the heterogenous list.

So I have objects:

base_class
  virtual method

derived_class_A
  inherit base_class

derived_class_B
  inherit base_class

...

And I would like to collect instances of derived_class_B,
derived_class_B etc.. into a data structure.

The obvious example is that I'd like to collect the objects into a
list and do something like :

List.iter 
  (f obj ->
    obj#method)
  list_of_objs

or is (obj :> base_class)#method ?


I've done quite a bit of searching but I cannot seem to find a "clean"
example of doing the above, just bits and pieces.  Can anyone point me
to any examples or code  ?

Thanks


Brian

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