Ticket #3934: d.h

#include <iostream>
using namespace std;


class D : public B {

public:

   D() {};

   D(std::string a);

   virtual ~D() {};

   virtual void aB();

   std::string m_string;

   template<class Archive> void serialize(Archive &ar, const unsigned int version)
   {
       ar & boost::serialization::base_object<B>(*this);
           ar & m_string;
   }
};