do not take a reference to the communicator

diff --git a/include/deal.II/base/mpi.h b/include/deal.II/base/mpi.h
index 3eddaf43ea2f3b92cf8769682fd2fc0ec1134ec5..fc039616827edb765a1e13ee5fd9775cde95c2b2 100644 (file)
--- a/include/deal.II/base/mpi.h
+++ b/include/deal.II/base/mpi.h
@@ -338,7 +338,7 @@ namespace Utilities
         /**
          * The communicator.
          */
-        const MPI_Comm &comm;
+        const MPI_Comm comm;
       };
 
       /**