Virtual Methods or Function Pointers

Question

When implementing polymorphic behavior in C++ one can either use a pure virtual method or one can use function pointers (or functors). For example an asynchronous callback c

Answer 1

1. Change to pure virtual, first off. Then inline it. That should negate any method overhead call at all, so long as inlining doesn't fail (and it won't if you force it).
2. May as well use C, because this is the only real useful major feature of C++ compared to C. You will always call method and it can't be inlined, so it will be less efficient.