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#include <iostream>
using namespace std;
template <class Derived>
class Vehicle
{
public:
void mass()
{
static_cast<Derived *>(this)->vmass();
}
// no need to implement vmass here, as it should be implemented
// by derived classes.
};
class Car: public Vehicle<Car>
{
friend void Vehicle<Car>::mass();
private:
void vmass()
{
cout << "Car's vmass called\n";
}
};
class Truck: public Car
{
private:
void vmass()
{
cout << "Car's vmass called\n";
}
};
int main()
{
Truck{}.mass();
}
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