Ej4C++

#include <cstdlib>
#include <iostream>

using namespace std;


/** The interfaces of the talkers */
class salute_interface {        /* Abstract Class */
    public:
    virtual void mucho_gusto () = 0;
    virtual void bien_y_vos () = 0;
    virtual void begin_chatter () = 0;
};

class respond_interface {       /* Abstract Class */
    public:
    virtual void hola () = 0;
    virtual void como_estas () = 0;
};

/** The concrete talkers */
class first_talker : public salute_interface {
    private:
    respond_interface * interlocutor;
    bool has_greeted;
    public:
    void mucho_gusto () {
        has_greeted = true;
        cout << "Mucho gusto \n" ;
        interlocutor -> como_estas ();
    };
    void bien_y_vos () {
        if (has_greeted){
            cout << "Bien, y vos? \n" ;
        }
    };
    void begin_chatter () {
        interlocutor -> hola ();
    };
    void initialize (respond_interface * talker) {
        has_greeted = false;
        interlocutor = talker;
    };
};

class second_talker : public respond_interface {
    private:
    salute_interface * interlocutor;
    bool has_been_greeted;
    public:
    void hola () {
        has_been_greeted = true;
        cout << "Hola \n" ;
        interlocutor -> mucho_gusto ();
    };
    void como_estas () {
        if (has_been_greeted) {
            cout << "Como estas? \n" ;
            interlocutor -> bien_y_vos ();
        }
    };
    void initialize (salute_interface * talker) {
        has_been_greeted = false;
        interlocutor = talker;
    };
};

int main (void) {

    first_talker * ft;
    second_talker * st;

    ft = new (first_talker);
    st = new (second_talker);

    ft -> initialize (st);
    st -> initialize (ft);

    ft -> begin_chatter ();

    delete (ft);
    delete (st);

    return 0;

}