Question

Lets suppose i have a super class WorkStation, and two subclass StationNormal, StationAdvanced. I have another class Robot, which has a WorkStation pointer that will start as a StationAdvanced but it can change, but my class WorkStation is a abstract class. I think class Robot should be something like this:

class Robot{
 private: 
       WorkStation * actualStation;
...
}

My question is how Robot class constructor should be defined if my class WorkStation is abstract.

Answer 1

I think the following should be sufficient:

class Robot{
 private: 
        WorkStation * actualStation;
 public:
        Robot();
        Robot(WorkStation * w);
}

Robot::Robot() // constructor that takes no arguments
{
    actualStation = new StationAdvanced();
}

Robot::Robot(WorkStation * w) // constructor that takes specific WorkStation
{
    actualStation = w;
}

You can invoke it with:

Robot rob1(),
      rob2(new StationAdvanced()),
      rob3(new StationNormal());