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

One major advantage of the first method is it has more type safety. The second method uses a void * for iParam so the compiler will not be able to diagnose type problems.

A minor advantage of the second method is that it would be less work to integrate with C. But if you're code base is only C++, this advantage is moot.