How much does an object reference weigh?

Question

C++ / C#

Imagine a situation in which we created an object A a = new A(), and then this object was passed to some method b.info(a). How much does a reference to object a weigh? And what does the weight of the link depend on (on the architecture of the operating system, the weight of the object itself, etc.)

Answer 1

For what purpose are you interested?
The link itself (it's just the memory address where the beginning of the object is located) takes 32-bits or 64-bits, depending on the OS. But I don't see any practical benefit from this knowledge in the context of c#.