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I think it is wrong/weird for objects of the same type to have different vtables, yes. I would call those different types. Upcasting is fine, but generally sp

• 1718627440 1y ago
  In most languages, this is not possible, because they abstract over the implementation of classes. In C it is so you can be more creative. You can for example use it instead of a flag for behaviour. Why branch on a variable and then call separate methods, when you can simply assign the wanted implementation directly. If you want to know, which implementation/mode is used, comparing function pointers and scalar variables amounts to the same. It is also an easy way to get a unique number. When all implementations of that can operate on the same type, they are interchangeable. In C you can also change the "class" of an instance as needed, without special syntax. Maybe you need to already call a method of the new/old class, before/after actually changing the class type. > is that the subclass method implementation is used The entire point of invoking the superclass method is, because the subclass has a different implementation and you want to use the superclass implementation.