Hi,

Below is a basic sample adapted from the documentation at:

http://tinyurl.com/55fr4q

For me, with Visual Studio 2008, the deserialization of the base pointer results in an instance of the base class, not the serialized derived class.  Also, if I add a virtual function to the base class, deserialization results in an exception (it attempts to instantiate the base class anyway).

I added the change cited here and rebuilt the serialization library, which did not help:

http://tinyurl.com/5j4e8x

Any suggestions would be appreciated.

Thanks,

Steve Sanders

#include "stdafx.h"

#include "stdafx.h"

#include <sstream>

// include headers that implement a archive in simple text format

#include <boost/archive/text_oarchive.hpp>

#include <boost/archive/text_iarchive.hpp>

#include <boost/serialization/export.hpp>

class base {

public:

    base(){ m_val = 1; }

void PrintVal( void )

    {

        printf(" Value: %d\n", m_val );

    }

protected:

//  virtual void foo(void) = 0;

friend class boost::serialization::access;

//...

// only required when using method 1 below

// no real serialization required - specify a vestigial one

template<class Archive>

void serialize(Archive & ar, const unsigned int file_version){}

int m_val;

};

class derived : public base {

public:

    derived(){ m_val = 2; }

private:

void foo(void){}

friend class boost::serialization::access;

template<class Archive>

void serialize(Archive & ar, const unsigned int file_version){

// method 1 : invoke base class serialization

        boost::serialization::base_object<base>(*this);

// method 2 : explicitly register base/derived relationship

        boost::serialization::void_cast_register<derived, base>(

static_cast<derived *>(NULL),

static_cast<base *>(NULL)

        );

    }

};

BOOST_CLASS_EXPORT_GUID(derived, "derived")

void test4(){

//...

    std::stringstream ss;

    boost::archive::text_oarchive oa(ss);

    derived *d = new derived();

    base *b = d;

    b->PrintVal();

    oa & d;

    boost::archive::text_iarchive ar(ss);

    b = NULL;

    ar & b;

    b->PrintVal();

}

int main() {

    test4();

return 0;

}