static boost::python::tuple getstate(const layer& l) { boost::python::list s; std::vector<std::string> const& style_names = l.styles(); for (unsigned i = 0; i < style_names.size(); ++i) { s.append(style_names[i]); } return boost::python::make_tuple(l.clear_label_cache(),l.min_zoom(),l.max_zoom(),l.queryable(),l.datasource()->params(),l.cache_features(),s); }