Best method to implement an abstract factory pattern

Question

Consider following code:

#include 


// =============================


class Shape{
public:
    virtual ~Shape(){};

    virtual void process         


        

Answer 1

Your factories are passing around ownership. There's another alternative to that aspect; instead of passing around ownership, you can make the factory own the objects:

   class Factory {
   public:
      ~Factory() { for(int i=0;i vec;
   };