#include <boost/tr1/unordered_set.hpp>
#include <boost/serialization/collections_save_imp.hpp>
#include <boost/serialization/collections_load_imp.hpp>
#include <boost/serialization/split_free.hpp>

namespace boost { 
namespace serialization {

template<class Archive, class Key, typename Hasher, class Compare, class Allocator >
inline void save(Archive & ar,
                 const std::tr1::unordered_set<Key, Hasher, Compare, Allocator> &t,
                 const unsigned int /* file_version */)
{
    boost::serialization::stl::save_collection<
        Archive,
        std::tr1::unordered_set<Key, Hasher, Compare, Allocator>
        >(ar, t);
}

template<class Archive, class Key, typename Hasher, class Compare, class Allocator >
inline void load(Archive & ar,
                 std::tr1::unordered_set<Key, Hasher, Compare, Allocator> &t,
                 const unsigned int /* file_version */)
{
    boost::serialization::stl::load_collection<
        Archive,
        std::tr1::unordered_set<Key, Hasher, Compare, Allocator>,
        boost::serialization::stl::archive_input_set<
            Archive, std::tr1::unordered_set<Key, Hasher, Compare, Allocator> 
        >,
        boost::serialization::stl::no_reserve_imp<
            std::tr1::unordered_set<Key, Hasher, Compare, Allocator> 
        >
    >(ar, t);
}

template<typename Archive, typename Key, typename Hasher, typename Compare, typename Allocator >
inline void serialize(Archive & ar,
                      std::tr1::unordered_set<Key, Hasher, Compare, Allocator> & t,
                      const unsigned int file_version)
{
    boost::serialization::split_free(ar, t, file_version);
}

} // namespace serialization
} // namespace boost


#include <string>
#include <iostream>
#include <sstream>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>

int main(int argc, char *argv[])
{
    std::stringstream data;
    {
        std::tr1::unordered_set<std::string> disorder;
        disorder.insert("hello");
        disorder.insert("world");
        boost::archive::text_oarchive output(data);
        output << disorder;
    }
    std::cout << data.str();
    {
        std::tr1::unordered_set<std::string> disorder;
        boost::archive::text_iarchive input(data);
        input >> disorder;
        for (std::tr1::unordered_set<std::string>::const_iterator it = disorder.begin();
             it != disorder.end();
             ++it)
        {
            std::cout << *it << std::endl;
        }
    }
    return 0;
}