g2_pp

#include <iostream>
#include <string>

using namespace std;

class robot {
public:
    static int liczba_obiektow;
    robot() { liczba_obiektow++; }
    virtual ~robot() { liczba_obiektow--; }
    virtual void praca() const = 0;
    virtual ostream& wyswietl(ostream& out) const = 0;
};
int robot::liczba_obiektow = 0;

class rt1: public robot {
protected:
    string *txt;

public:
    rt1(): txt(new string("---")) {}
    rt1(const string& a): txt(new string(a)) {}
    rt1(const rt1& a): txt(new string(*a.txt)) {}

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

    ~rt1() { delete txt; }

    ostream& wyswietl(ostream& out) const  {
        return out << *txt << endl;
    }
    void praca() const { wyswietl(cout); }

};

class rt2: public rt1 {
protected:
    int ilosc;

public:
    rt2(): rt1(), ilosc() {}
    rt2(const string& a, const int& b): rt1(a), ilosc(b) {}

    ostream& wyswietl(ostream& out) const  {
        if(*txt == "---" && ilosc == 0) throw string("robot niezaprogramowany");
        return out << *txt << " " << ilosc << endl;
    }
    void praca() const { wyswietl(cout); }


    rt2& operator -= (const int& i) {
        ilosc -= i;
        return *this;
    }
};

robot& operator -= (robot& r, const int& i) {
    *(static_cast<rt2*>(&r))-=i;
    return r;
}

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


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 rt1("polozono");
    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];
        }
        catch(const string& e) { cout << e << endl; }
    cout << "********* 5 **********" << endl;
    for(int i=0; i<5; ++i)
        delete linia[i];


    return 0;
}