access to is prop operator, is reward operator in formulae

src/logic/formulae.cpp

@@ -18,6 +18,9 @@ void define_formulae(py::module& m) {
     formula.def("__str__", &storm::logic::Formula::toString)
         .def("clone", [](storm::logic::Formula const& f) { storm::logic::CloneVisitor cv; return cv.clone(f);})
         .def("substitute_labels_by_labels", [](storm::logic::Formula const& f, std::map<std::string, std::string> const& labelSubs) {storm::logic::LabelSubstitutionVisitor lsv(labelSubs); return lsv.substitute(f);}, "substitute label occurences", py::arg("replacements"))
+        .def_property_readonly("is_probability_operator", &storm::logic::Formula::isProbabilityOperatorFormula, "is it a probability operator")
+        .def_property_readonly("is_reward_operator", &storm::logic::Formula::isRewardOperatorFormula, "is it a reward operator")
+
             ;
 
     // Path Formulae