k_roboty

#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 robot& operator-=(const int& i){return *this;};
    virtual ~robot(){liczba_obiektow--;}
};
int robot::liczba_obiektow = 0;
class rt1: public robot{
protected:
    string * t;
public:
    rt1(): t(new string("---")){}
    rt1(const string& a): t(new string(a)){}
    rt1(const rt1& r): t(new string(*r.t)){}

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


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

    ~rt1(){delete t;}
};

class rt2: public rt1{
    int l;
public:
    rt2(): l(0){}
    rt2(const string &a1, const int& a2): rt1(a1), l(a2){}

    void praca()const {cout << *t << ' '<< l << endl;}
    ostream& wyswietl(ostream& out)const{
        if(*t == "---" && l == 0) throw string("robot niezaprogramowany");
        return out << *t << ' '<< l << endl;
    }

    robot& operator-=(const int& i){
        l -= i;
        return *this;
    }
};



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;
}