Of course the fib example is extreme. But some code bases do a lot of calls, and people care about calling overhead. I think a moderate calling overhead like, e

Of course the fib example is extreme. But some code bases do a lot of calls, and people care about calling overhead. I think a moderate calling overhead like, e.g., with Herbecptions is acceptable, because usually people doing something useful in a function that will mask the calling overhead. But other approaches are really to expensive to justify, they violate the zero-overhead promise of C++.