avoid duplicate register error

Author: renefritze

lib/bindings.cc

@@ -20,7 +20,7 @@ template <typename Number>
 void bind_vector(pybind11::module& module) {
   typedef dealii::Vector<Number> Vector;
   typedef typename Vector::size_type size_type;
-  py::class_<Vector>(module, "Vector")
+  py::class_<Vector>(module, "Vector", py::buffer_protocol())
       .def(py::init<>())
       .def(py::init<const Vector&>())
       .def(py::init<const size_type>())

lib/py_elasticity.cc

@@ -17,6 +17,7 @@
 namespace py = pybind11;
 
 PYBIND11_MODULE(dealii_elasticity, m) {
+  py::module::import("pymor_dealii_bindings");
 
   m.doc() = "deal.II elasticity example";