robocik

#include <iostream>
#include <string>

using namespace std;

class robot {
public:
    static int liczba_obiektow;
    robot() { liczba_obiektow++; }
    virtual void praca()const = 0;
    virtual ostream& wyswietl(ostream& out)const = 0;
    virtual void zamien(const int& p) = 0;
    friend const robot& operator-=(robot&r,const int& p);

    virtual ~robot() { liczba_obiektow--; }
};

const robot& operator-=(robot& r, const int& p) {
    r.zamien(p);
    return r;
}

int robot::liczba_obiektow = 0;

class rt1 :public robot {
protected:
    string * txt;
public:
    rt1():txt(new string("brak")){}
    rt1(const string& a1) :txt(new string(a1)) {}
    rt1(const rt1& r) :txt(new string(*r.txt)) {}

    rt1& operator=(const rt1& r) {
        if (this != &r) {
            delete txt;
            txt = new string(*r.txt);
        }return *this;
    }

    void praca()const {
        cout << *txt<<endl;
    }

    void zamien(const int& p){}

    ostream& wyswietl(ostream& out)const { return out << *txt; }


  ~rt1() { delete txt; }
};




class rt2 :public rt1 {
    int w;
public:
    rt2():rt1(),w(0){}
    rt2(const string& a1,const int& a2) :rt1(a1), w(a2) {}
    rt2(const rt2& r) :rt1(*r.txt),w(r.w) {}

    void praca()const {
        cout << *txt << " " << w  << endl;
    }

    void zamien(const int& p) {
        w -= p;
    }

    ostream& wyswietl(ostream& out)const {
        if (*txt == "brak" && w == 0)throw string("robot niezaporogramowany");
        return out << *txt << " " << w; }
};




ostream& operator<<(ostream& out, const robot& r) {
    return r.wyswietl(out) << endl;
}

int main()
{
    const rt1 odbior("odebrano gotowy produkt");

    robot* linia[5];
    linia[0] = new rt1("polozono");
    linia[1] = new rt2("uderzono",5);
    linia[2] = new rt2("prawo", 4);
    linia[3] = new rt2("uderzono", 7);
    linia[4] = new rt1(odbior);

    for (int i = 0; i < 5; i++) {
        linia[i]->praca();
    }

    cout << "********3**********" << endl;

    *linia[3] -= 5;

    for (int i = 0; i < 5; i++) {
        cout <<*linia[i];
        delete linia[i];
    }
    cout << "********4**********" << endl;

    cout << "liczba robotow: " << robot::liczba_obiektow << endl;

    linia[0] = new rt1("polozono");
    linia[1] = new rt2;
    linia[2] = new rt2("prawo", 4);
    linia[3] = new rt2;
    linia[4] = new rt1(odbior);

    cout << "liczba robotow: " << robot::liczba_obiektow << endl;


        for (int i = 0; i < 5; i++) try{
            cout << *linia[i];
            delete linia[i];
        }catch (const string e) { cout << e <<endl; }



    cout << "********5**********" << endl;


    return 0;
}