Use the field-type constructor of DiagonalMatrix

amdis/gridfunctions/CoordsGridFunction.hpp

@@ -46,7 +46,7 @@ namespace AMDiS
         template <class T, int N>
         Dune::DiagonalMatrix<T, N> operator()(Dune::FieldVector<T, N> const& /*x*/) const
         {
-          return Dune::DiagonalMatrix<T,N>{T(1)};
+          return Dune::DiagonalMatrix<T,N>(T(1));
         }
       };
       friend Derivative derivativeOf(CoordsFunction const& /*f*/, tag::gradient)