#include <iostream>

class Base
{
    public:
        virtual ~Base();
        virtual void pureimp() = 0;
};
Base::~Base()
{}
void Base::pureimp()
{
    std::cout << "Base::pureimp() called\n";
}
class Derived: public Base
{
    public:
        virtual void pureimp();
};
inline void Derived::pureimp()
{
    Base::pureimp();
    std::cout << "Derived::pureimp() called\n";
}
int main()
{
    Derived derived;

    derived.pureimp();
    derived.Base::pureimp();

    Derived *dp = &derived;

    dp->pureimp();
    dp->Base::pureimp();
}
// Output:
//      Base::pureimp() called
//      Derived::pureimp() called
//      Base::pureimp() called
//      Base::pureimp() called
//      Derived::pureimp() called
//      Base::pureimp() called