purevirtualimpl.cpp

#include <iostream>
using namespace std;

class VirtBase
{
public:
    virtual void test() = 0;
};

class Derived : public VirtBase
{
    typedef VirtBase super;
public:
    void test() override;
};

void VirtBase::test()
{
    cout << "VirtBase" << endl;
}

void Derived::test()
{
    super::test(); // You cannot call base function by pointer since it is declared pure virtual, 
    // but you can still call it statically which is the whole point of this implementation.
    cout << "Derived" << endl;
}

int main()
{
    VirtBase* cls = new Derived;
    cls->test();
}