Alternative to c++ static virtual methods

Question

In C++ is not possible to declare a static virtual function, neither cast a non-static function to a C style function pointer.

Now, I have a plain ol\' C SDK that us

Answer 1

Virtual functions are essentially function pointers under-the-hood. They just point to different functions for different classes. To simulate virtual-function behavior, have a function pointer stored somewhere, then to 'override' it just reassign it to some different function.

Alternatively, you might want to test this, but I think interfaces have pretty good binary compatibility. You might get away with exposing a C++ interface composed entirely of pure virtual functions, so long as all the parameters and return types have a consistent binary format (eg. C types). It's not a standard, but it might be portable enough.