{

// will be auto-converted to proper python type by `mapnik_value_to_python`

return mapnik::util::apply_visitor(mapnik::evaluate<mapnik::feature_impl,

mapnik::value,mapnik::attributes>(f, mapnik::dict2attr(d)),expr);

{

return mapnik::util::apply_visitor(mapnik::evaluate<mapnik::feature_impl,

mapnik::value,mapnik::attributes>(f, mapnik::dict2attr(d)),expr).to_bool();

{

py::class_<mapnik::expr_node, mapnik::expression_ptr>(m, "Expression")

.def(py::init([] (std::string const& wkt) { return parse_expression_(wkt);}))

.def("evaluate", &expression_evaluate_, py::arg("feature"), py::arg("variables") = py::dict())

.def("to_bool", &expression_evaluate_to_bool_, py::arg("feature"), py::arg("variables") = py::dict())

.def("__str__", &expression_to_string_);

;

py::class_<mapnik::path_expression, mapnik::path_expression_ptr>(m, "PathExpression")

.def(py::init([] (std::string const& wkt) { return parse_path_(wkt);}))

.def("evaluate", &path_evaluate_)

.def("__str__",&path_to_string_);

;