#include <boost/serialization/access.hpp>
#include <boost/serialization/map.hpp>

#include <boost/archive/binary_oarchive.hpp>
#include <map>
#include <iostream>


class BlockFormula : public std::map<int, int> {
public:
    int i;
    template<class Archive>
    void serialize(Archive& ar, unsigned)
    {
	ar & i;
    }
};

int main()
{
    boost::archive::binary_oarchive oa(std::cout);
    BlockFormula f;
    oa << f;
    return 0;
}