Child.h

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using namespace std;

#ifndef NULL //!<Define if undefined.
#define NULL 0
#endif

#ifndef CHILD_H
#define CHILD_H //!<Inclusion guard.
template <class T>
class Child
{
 public:
  Child(T * toSet)
    {
      myT = toSet;
      if(myT!=NULL)
        myT->addChild(this);
    } 

  ~Child()
    {
      if(myT!=NULL)
        myT->removeChild(this);
      myT=NULL;
    } 

  virtual T * getChildAddable() const
  {
    return myT;
  } 
  
  void parentDestroyed()
  {
    myT = NULL;
  } 

  bool operator== (const T& rhs) const
  {
    if((myT!=NULL) && rhs.myT==NULL)
      return false;
    if((myT==NULL) && rhs.myT!=NULL)
      return false;
    if(myT==NULL && rhs.myT==NULL)
      return true;
    if(myT!=NULL && rhs.myT!=NULL)
      return *myT==*(rhs.myT);
  } 
  
 private:
  T * myT; 
};
#endif