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#include <iostream>
class Vehicle {
public:
int position;
Vehicle();
virtual void move(int d);
};
Vehicle::Vehicle() {
position = 10;
}
void Vehicle::move(int d) {
std::cout << "vehicle moves\n";
position = position + d;
}
class Car : public Vehicle {
public:
// champ position hérité
int passengers;
Car();
// methode move() héritée
void await(Vehicle &v);
};
Car::Car() {
}
void Car::await(Vehicle &v) {
std::cout << "await: position = " << v.position << "\n";
if (v.position < position)
v.move(position - v.position);
else
move(10);
}
class Truck : public Vehicle {
public:
// champ position hérité
int load;
Truck();
void move(int d);
};
Truck::Truck() {
}
void Truck::move(int d) { // methode move redéfinie
std::cout << "truck moves\n";
if (d <= 55) position = position + d; else position = position + 55;
}
int main() {
Truck t;
std::cout << "t at " << t.position << "\n";
Car c;
c.passengers = 2;
std::cout << "c at " << c.position << "\n";
c.move(60);
std::cout << "c at " << c.position << "\n";
Vehicle *v = &c; // alias
v->move(70);
std::cout << "c at " << c.position << "\n";
c.await(t);
std::cout << "t at " << t.position << "\n";
std::cout << "c at " << c.position << "\n";
}
/*
Local Variables:
compile-command: "make vehicles"
End:
*/
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