Re: [Boost-users] How to serialize a derived class object withbaseclass pointer?

From: Yan Zhang (Yan.Zhang_at_[hidden])
Date: 2005-07-12 10:24:37

Hi Robert,

 

I know that it works for abstract base class. But if the base class is
not abstract class how you do it? Is it possible?

 

Thanks,

 

yan

 

  _____  

From: boost-users-bounces_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] On Behalf Of Robert Ramey
Sent: Monday, July 11, 2005 3:55 PM
To: boost-users_at_[hidden]
Subject: Re: [Boost-users] How to serialize a derived class object
withbaseclass pointer?

 

try making the base class a polymorphic class by adding the following
changes:

 

virtual ~CMyCls1() = 0;

        "Yan Zhang" <Yan.Zhang_at_[hidden]> wrote in message
news:F96935FCB9C3D549B3B6CD8915811A2F0FF00C7C_at_mail60nt.mitchell.com...

        Hi,

         

        I'm trying to serialize an object of derived class with a base
class pointer, somehow only base class's serialization member function
got called. Here is the code (simplified):

         

        class CMyCls1

        {

        public:

              CMyCls1() : m(10) {}

              ~CMyCls1() {}

         

        private:

        friend class boost::serialization::access;

              template<class Archive>

            void serialize(Archive &ar, const unsigned int version)

            {

                    ar & BOOST_SERIALIZATION_NVP(m);

            }

         

              int m;

           virtual ~CMyCls1() = 0;

        };

         

        class CMyCls2 : public CMyCls1

        {

        public:

              CMyCls2() : x(1.5) {}

              ~CMyCls2() {}

         

        private:

              friend class boost::serialization::access;

              template<class Archive>

            void serialize(Archive &ar, const unsigned int version)

            {

                    ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(CMyCls1);

                    ar & BOOST_SERIALIZATION_NVP(x);

            }

         

              double x;

           virtual ~CMyCls2();

        };

         

        void main ()

        {

         

                    CMyCls1 *pmycls = new CMyCls2;

                    ...

              oa.register_type(static_cast<CMyCls1 *>(NULL));

              oa.register_type(static_cast<CMyCls2 *>(NULL));

              oa << BOOST_SERIALIZATION_NVP(pmycls);

                    ...

        }

         

        Look at the archive file, only base class data is serialized.
Actuall, CMyCls2::serialization() is not called at all. How do you
serialize a derived class object with a pointer of base class?

         

        Thanks,

         

        Yan

         

         

        
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