struct ShapeInterface
{
 virtual void Draw()=0;
 virtual void SetName(char* name)=0;
 virtual char* GetName()=0;
};
struct CircleInterface:public ShapeInterface
{
  virtual void SetRadius(double radius)=0;  
};
class ShapeImpl:public ShapeInterface
{
  virtual void SetName(char* name){/*save it somewhere*/}
  virtual char* GetName(){/*return it*/ return NULL;}
};
class CircleImpl:public CircleInterface,public ShapeImpl
{
 virtual void Draw(){/*draw a circle*/}
 virtual void SetRadius(double radius){/*set the radius*/}
};

int main()
{
 CircleImpl circle;
 return 0;
}

In function 'int main()':
Line 24: error: cannot declare variable 'circle' to be of abstract type 'CircleImpl'
compilation terminated due to -Wfatal-errors.