From ab0ce98232960b0ada8880ed7810f079add70220 Mon Sep 17 00:00:00 2001
From: Matthias Maier <tamiko@43-1.org>
Date: Sat, 11 May 2019 17:32:00 -0500
Subject: [PATCH] change value to reference

---
 examples/step-6/step-6.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/step-6/step-6.cc b/examples/step-6/step-6.cc
index 7f7f9ee82c..f7086ecde5 100644
--- a/examples/step-6/step-6.cc
+++ b/examples/step-6/step-6.cc
@@ -284,7 +284,7 @@ void Step6<dim>::assemble_system()
 
   std::vector<types::global_dof_index> local_dof_indices(dofs_per_cell);
 
-  for (const auto cell : dof_handler.active_cell_iterators())
+  for (const auto &cell : dof_handler.active_cell_iterators())
     {
       cell_matrix = 0;
       cell_rhs    = 0;
-- 
2.39.5