int main() {

// create and open a character archive for output

// std::ofstream ofs("filename");

boost::iostreams::mapped_file_params params;

params.path = "filepath";

params.flags = io::mapped_file::mapmode::readwrite;

params.new_file_size = 10240;

out_streambuf obuf(params);

std::ostream ofs(&obuf);

// create class instance

const gps_position g(35, 59, 24.567f);

// save data to archive

{

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

// write class instance to archive

oa << g;

// archive and stream closed when destructors are called

}

/* ready for reading */

params.flags = io::mapped_file::mapmode::readonly;

params.new_file_size = 0;

// ... some time later restore the class instance to its orginal state

gps_position newg;

{

// create and open an archive for input

in_streambuf ibuf(params); /* this is throwing me exceptions */

std::istream ifs(&ibuf);

//std::ifstream ifs("filename");

boost::archive::text_iarchive ia(ifs);

// read class state from archive

ia >> newg;

// archive and stream closed when destructors are called

}

return 0;

}