#include <iostream>
#include <string>
using namespace std;
 
class WithNotification {
public:
    virtual void notify()=0;
};
 
class Robot : public virtual WithNotification {
private:
    string name;
public:
    Robot(const string& n) : name(n) {}
    virtual void notify() {cout << name << " has been notified" << endl; }
};
 
class Task {
private:
    WithNotification& onFinished;
public:
    Task(WithNotification& f) : onFinished(f) {}
    void run() {
        cout << "The task is running" << endl;
        onFinished.notify();
    }
};
 
int main() {
	Robot r1("Quick");
	Robot r2("Brown");
        Task t1(r1);
        Task t2(r2);
        t1.run();
        t2.run();
}

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