[Boost-users] problem using boost::archive::xml_oarchive to serliaze a map

From: Thomas D\\\'Silva (twdsilva_at_[hidden])
Date: 2006-10-06 11:11:40

Hello,

I am trying to use boost::archive::xml_oarchive to serialize a 
vector<map<string, map<string,int> > >. When I examine the serialized xml file,
I see that some of the map elements are duplicated which causes an assertion
when I try to load the file because a map cannot have two elements with the same
key. I would appreciate any insight into this error.

Thank you
Thomas D'Silva

/include/boost/serialization/collections_load_imp.hpp:69: void
boost::serialization::stl::archive_input_map<Archive,
Container>::operator()(Archive&, Container&) [with Archive =
boost::archive::xml_iarchive, Container = std::map<std::string, int,
std::less<std::string>, std::allocator<std::pair<const std::string, int> > >]:
Assertion `result.second' failed.

#include <boost/archive/xml_oarchive.hpp>
#include <boost/archive/xml_iarchive.hpp>
#include <boost/serialization/vector.hpp>
#include <boost/serialization/map.hpp>
#include <boost/serialization/string.hpp>
#include <boost/serialization/nvp.hpp>

using namespace std;
using namespace boost::filesystem;
  
class DistributionTable
{
    private:
        friend class boost::serialization::access;
        template<class Archive>
        void serialize(Archive & ar, const unsigned int version) {
            ar & BOOST_SERIALIZATION_NVP(neTable);
            ar & BOOST_SERIALIZATION_NVP(mappedTable);
        }
        vector<map<string,map<string,int> > >  neTable;
        vector<map<string,map<string,int> > >  mappedTable;
    public:
        DistributionTable(){};
};

void saveTable(const DistributionTable &t, string filename) { 
    ofstream ofs(filename.c_str());
    boost::archive::xml_oarchive oa(ofs);
    oa <<BOOST_SERIALIZATION_NVP(t);
    ofs.flush();
}

void loadTable(DistributionTable &t, string filename) {
    ifstream ifs(filename.c_str());
    boost::archive::xml_iarchive ia(ifs);
    ia >>BOOST_SERIALIZATION_NVP(t);
}