Re: [Boost-users] Serialization: Problem with registering derivedclasses

From: Robert Ramey (ramey_at_[hidden])
Date: 2007-04-18 22:26:41

I took your code and fixed it up to that below and it compile and tests 
fine.

Note the usage of BOOST_SERIALIZATION_BASE_OBJECT_NVP
below which is key.  This is explained in the documentation.

Robert Ramey

Luca Cappa wrote:

#include <boost/serialization/shared_ptr.hpp>

#include <boost/archive/xml_oarchive.hpp>

#include <fstream>

using namespace std;

using namespace boost;

using namespace boost::serialization;

struct SerializableBase

{

virtual ~SerializableBase ()

{

}

template<typename Archive>

void serialize (Archive& pAR, unsigned int version)

{

int i (0);

pAR & make_nvp ("doesnotwork", i);

}

};

struct Serializable : public SerializableBase

{

int a;

Serializable () : a (1)

{

}

virtual ~Serializable ()

{

}

template<typename Archive>

void serialize (Archive& pAR, unsigned int version)

{

pAR & BOOST_SERIALIZATION_BASE_OBJECT_NVP(SerializableBase);

pAR & BOOST_SERIALIZATION_NVP (a);

}

};//struct

void save (const Serializable& pS, const char* pFileName)

{

// make an archive

std::ofstream ofs (pFileName);

boost::archive::xml_oarchive oa (ofs);

// Registering a lot of things here!

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

SerializableBase* lS (new Serializable);

oa << make_nvp ("lS", lS);

}

int main ()

{

Serializable s;

save (s, "serializable.xml");

}