Objects and members

[wysota]

Maybe something like this will do:

class xyz {
public:
  static xyz *create(){ return new xyz(); }; 
  ~xyz(){ int ind = xyz::_instances.indexOf(this); xyz::_instances[ind]=0; }
  void doSomething(uint ind){ 
    if(xyz::_instances.size()<=ind || xyz::_instances.value(ind)==0) 
      return; 
    xyz::_instances[ind]->inc();
  }
private:
  xyz(){ xyz::_instances << this; ref = 0; };
  static QList<xyz*> _instances;
  void inc(){ ref++; }
  int ref;
};

class xyz {
public:
  static xyz *create(){ return new xyz(); }; 
  ~xyz(){ int ind = xyz::_instances.indexOf(this); xyz::_instances[ind]=0; }
  void doSomething(uint ind){ 
    if(xyz::_instances.size()<=ind || xyz::_instances.value(ind)==0) 
      return; 
    xyz::_instances[ind]->inc();
  }
private:
  xyz(){ xyz::_instances << this; ref = 0; };
  static QList<xyz*> _instances;
  void inc(){ ref++; }
  int ref;
};

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This makes sure you can't create an object on stack and stores all instances of the class in the class itself.

Edit: In the destructor the pointer in the list should be zeroed and a check for null pointer should be made before dereferencing it. I'll adjust the code...