k2_3

#include <iostream>
#include <string>

using namespace std;

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

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{
        return out << *t << ' '<< l << endl;
    }

    rt2& operator-=(const int& i){
        if(i != 0){l -= 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;

    return 0;
}