Resolve "compiler errors with AMR / SAAMG enabled"

Closes #587 (closed)

src/Solvers/AMR_MG/MueLuPreconditioner.hpp

@@ -33,9 +33,10 @@ MueLuPreconditioner<Level>::MueLuPreconditioner(const std::string& reuse)
 
 template <class Level>
 void MueLuPreconditioner<Level>::create(const Teuchos::RCP<amr::matrix_t>& A,
-                                        Level* level_p)
+                                        Level* /*level_p*/)
 {
-    Teuchos::RCP<Tpetra::Operator<> > At = Teuchos::rcp_dynamic_cast<Tpetra::Operator<> >(A);
+    typedef Tpetra::Operator<scalar_t, lo_t, go_t, amr::node_t> TpetraOperator_t;
+    Teuchos::RCP<TpetraOperator_t> At = Teuchos::rcp_dynamic_cast<TpetraOperator_t>(A);
     prec_mp = MueLu::CreateTpetraPreconditioner(At, params_m);
 }