oop3 copyconstr

PassengerCompartment(const String& description_given) : PlaneComponent(description_given), inner_PassengerCompartment(NULL)
    {std::cout << "PassengerCompartment just created!" << std::endl;}
PassengerCompartment(const PassengerCompartment& given) : PlaneComponent(given)
{
    if (given.inner_PassengerCompartment != NULL )
    {//if the given PassengerCompartment has an inner PassengerCompartment, copy that, too
        inner_PassengerCompartment = new PassengerCompartment(given.inner_PassengerCompartment->get_description());
    }
    std::cout << "PassengerCompartment just created!" << std::endl;
}

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kai me aythn kanw to allocation gia to inner passenger compartment:
void PassengerCompartment::more_space(const String& inner_description)
{
    static bool have_added_space = false;
    if (!have_added_space)
    {
        float random = ((float)rand())/(float)(RAND_MAX);
        if ( random >= 0.5 )
        {
            inner_PassengerCompartment = new PassengerCompartment(inner_description);
        }
        have_added_space = true;
    }
}