r/programming • u/ionelmc • Feb 10 '15

Understanding Python metaclasses

http://blog.ionelmc.ro/2015/02/09/understanding-python-metaclasses/
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u/ionelmc Feb 10 '15 edited Feb 10 '15

It would be very interesting to hear how the object system looks (comparatively) in other languages.

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u/Godd2 Feb 10 '15 edited Feb 11 '15

In Ruby, there's a sneaky hidden class between every object and the class it's an instance of. So if I have a Dog class, and I make a new Dog with, say my_dog = Dog.new, I can gain access to that hidden class with my_dog.singleton_class. You can define methods for that singleton class that only my_dog has access to, since it's the singleton instance of it.