Can I inherit from an OCaml class chosen at runtime?

So right now I have two classes of the same class type, e.g. ``` class foo : foo_type = object ... end class bar : foo_type = object ... end ``` I'd like to have a third class that inherits from either `foo` or `bar` at runtime. E.g. (pseudo-syntax) ``` class baz (some_parent_class : foo_type) = object inherit some_parent_class ... end ``` Is this possible in OCaml? Use case: I'm using objects for constructing AST visitors, and I'd like to be able to combine these visitors based on a set of runtime criteria so that they only do one combined traversal over the AST. Edit: I think I have found a way to create the desired class using first-class modules: ``` class type visitor_type = object end module type VMod = sig class visitor : visitor_type end let mk_visitor m = let module M = (val m : VMod) in (module struct class visitor = object inherit M.visitor end end : VMod) ``` However, it seems a little roundabout to have to wrap a class in a module in order to make it "first-class". If there's a more straightforward way please let me know.