vcallsyo

//blah.hpp
class Base {
public:
    virtual void coolShit() = 0;
};

class Derived : public Base {
public:
    void coolShit();
};

extern Base* basePtr;

//blah.cpp
#include "vcalls.hpp"
#include <iostream>

Base* basePtr = new Derived();
void Derived::coolShit() {
    std::cout << "Derived coolShit";
};

int main(int argc, char** argv) {
    basePtr->coolShit();
}