See below. Robert Ramey Adrien Guillon wrote:

Hi all,

I don't understand why the following code does not work. I get an unregistered class exception.

AJ

#include #include #include #include

#include <string> #include <sstream> #include <iostream>

namespace pbb { // BEGIN NAMESPACE pbb namespace internal { // BEGIN NAMESPACE internal

/** * The base class for all requests to be made of a server. */ class server_request { friend class boost::serialization::access; public: virtual ~server_request(); virtual std::string description() = 0; private: template <typename Archive> void serialize(Archive& ar, const unsigned int version) { } };

class hello_request : public server_request { friend class boost::serialization::access; public: virtual ~hello_request(); virtual std::string description(); private: template <typename Archive> void serialize(Archive& ar, const unsigned int version) { ar & boost::serialization::base_object(*this); } };

} // END NAMESPACE internal } // END NAMESPACE pbb

namespace pbb { // BEGIN NAMESPACE pbb namespace internal { // BEGIN NAMESPACE internal

server_request::~server_request() { }

hello_request::~hello_request() { }

std::string hello_request::description() { return "HELLO REQUEST"; }

} // END NAMESPACE internal } // END NAMESPACE pbb

BOOST_CLASS_EXPORT(pbb::internal::server_request); BOOST_CLASS_EXPORT(pbb::internal::hello_request);

void msave(const pbb::internal::server_request& request, boost::archive::text_oarchive& o) { o << request; }

pbb::internal::server_request* mload(boost::archive::text_iarchive& in) { pbb::internal::server_request* r; in >> r; return r; }

int main() {

// Create a string stream for I/O std::stringstream stream;

pbb::internal::server_request* request = new pbb::internal::hello_request();

// Write a server request {

boost::archive::text_oarchive out_archive(stream); //msave(*request, out_archive); // uh oh - throwing away "pointerness" out_archve << request; }

// Read a server request pbb::internal::server_request* incoming_request;> { boost::archive::text_iarchive in_archive(stream); incoming_request = mload(in_archive); // preserve symetry in_archve >> incoming request }

std::cout << incoming_request->description() << std::endl;

}