Options reader_opts;

reader_opts.add<std::string>("filename", "/path/to/my/file.las");
reader_opts.add<bool>("debug", true);

Options writer_opts;
writer_opts.add<std::string>("filename", "/path/to/output/file.laz");
writer_opts.add<bool>("compression", true);

// This copies reader_opts and in the process calls
// Options::setStageName(this.getName());
drivers.las.Reader reader(reader_opts);

drivers.las.Writer writer(reader, writer_opts);

Options const& r_ops = reader.getOptions();
std::string const& r_name = r_ops.getStageName(); // returns drivers.las.reader
Options const& w_ops = writer.getOptions();
std::string const& w_name = w_ops.getStageName(); // returns drivers.las.writer


Options::iterator i = writer.getOptions("drivers.las.reader")

while (i)
{
    std::cout << "filename: " << i->getOption<std::string>("filename") << std::cout;
    i++;
}