constructors as virtual

Hi Everyone,

  I understand that the constructors can't be virtual and parashift
has the following example, to have an workaround for the constructors
to be virtual,

 class Shape {
 public:
   virtual ~Shape() { } // A virtual destructor
   virtual void draw() = 0; // A pure virtual function
   virtual void move() = 0;
   ...
   virtual Shape* clone() const = 0; // Uses the copy constructor
   virtual Shape* create() const = 0; // Uses the default
constructor
 };

 class Circle : public Shape {
 public:
   Circle* clone() const; // Covariant Return Types; see below
   Circle* create() const; // Covariant Return Types; see below
   ...
 };

 Circle* Circle::clone() const { return new Circle(*this); }
 Circle* Circle::create() const { return new Circle(); }

Now, new Circle() would create a Circle object, and the constructor of
bsae class Shape would be called first before Circle right? So how
does it offer to be a workaround for the constructors being virtual?

Thanks in advance!!!