about the cost of virtual function

Question

If I call a virtual function 1000 times in a loop, will I suffer from the vtable lookup overhead 1000 times or only once?

Answer 1

I would say this depends on your compiler as well as on the look of the loop. Optimizing compilers can do a lot for you and if the VF-call is predictable the compiler can help you. Maybe you can find something about the optimizations your compiler does in your compiler documentation.