From d958b57563aef2541184b7f958d63a4b5b84cd8b Mon Sep 17 00:00:00 2001
From: Mathias Anselmann <mathias.anselmann@posteo.de>
Date: Wed, 11 Nov 2020 10:33:42 +0100
Subject: [PATCH] save a copy of the locally owned DoFs IndexSet and use a
 reference instead

---
 source/dofs/dof_renumbering.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/source/dofs/dof_renumbering.cc b/source/dofs/dof_renumbering.cc
index 03a4f8bd35..9ea1a95e33 100644
--- a/source/dofs/dof_renumbering.cc
+++ b/source/dofs/dof_renumbering.cc
@@ -410,8 +410,8 @@ namespace DoFRenumbering
     //
     // note that if constraints are not requested, then the 'constraints'
     // object will be empty and using it has no effect
-    IndexSet       locally_relevant_dofs;
-    const IndexSet locally_owned_dofs = [&]() {
+    IndexSet        locally_relevant_dofs;
+    const IndexSet &locally_owned_dofs = [&]() -> const IndexSet & {
       if (reorder_level_dofs == false)
         {
           DoFTools::extract_locally_relevant_dofs(dof_handler,
-- 
2.39.5