Given an object, is there a clean way of creating a new object that
wraps the original and then adds a new method?
It doesn’t have to wrap the old object if there’s a way to directly add
a new method to the object (I’m allowed to change the incoming object).
how do I add a method to obj
or create a wrapper for it?
return obj #or new_obj that quacks like obj, has obj data, and also
has extra method
In my C++ days I would create a class that derives from the original
class, extends it with a new method, and defines a copy constructor to
copy the state of the original object.