[Boost-users] serialization question

From: Aljaz (aljaz.fajmut_at_[hidden])
Date: 2007-02-06 14:28:37

Hello..
I have a derived class serialization:
for instance:

class client_request_base {
public:
   client_request_base() : _type( 0 ) {}
private:
   friend boost::serialization::access;
   template< class ARCHIVE >
   void serialize( ARCHIVE& ar, const unsigned int version ) {
      ar & _type;
   }
   unsigned int _type;
};

class calc_skip_images_request : public client_request_base {
public:
   calc_skip_images_request()  : client_request_base( 1 ), _images_client( 
0 ) {}
private:
   friend boost::serialization::access;
   template< class ARCHIVE >
   void serialize( ARCHIVE& ar, const unsigned int version ) {
      ar & boost::serialization::base_object<client_request_base>( *this );
      ar & _images_client;
   }
   unsigned int _images_client;
};

Now I wonder.. If I want to use serialization do I have do EXPORT second 
class? Or set first class to abstract?
Like:

BOOST_IS_ABSTRACT( client_request_base )
BOOST_CLASS_EXPORT(calc_skip_images_request)

Im confused which of these two things is needed? When should I use export 
and when is abstract macro?