How function pointers are shared across different processes?

Question

And it is dependent on what?(OS/RAM?)

Answer 1

Two processes can not share function pointers.
Both process has a different virtual address space. If you send address of a function from process A to process B, in process B address from A does not make any sense. The memory mapping in process A will be different from that in process B. If you want to do so u need to know the memory mapping of process A and according to that you need to deference the memory in process B.

Comments

what about shared memory

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Yes i think through "Shared memory", it can be possible. But what if the object itself contain a pointer as member variable?

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My bad, you are right a pointer is a reference (not the actual memory location) so its not possible.