From afb750f84be29c352581f7a446a4641505b47842 Mon Sep 17 00:00:00 2001
From: Luca Heltai <luca.heltai@sissa.it>
Date: Mon, 25 Jul 2022 16:24:37 +0300
Subject: [PATCH] Fixed clang-tidy.

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

diff --git a/source/grid/tria.cc b/source/grid/tria.cc
index 2f8fa9c9f6..eaa30ee9eb 100644
--- a/source/grid/tria.cc
+++ b/source/grid/tria.cc
@@ -13987,8 +13987,8 @@ Triangulation<dim, spacedim>::has_hanging_nodes() const
     }
   else
     {
-      for (const auto cell : active_cell_iterators())
-        for (const auto i : cell->face_indices())
+      for (const auto &cell : active_cell_iterators())
+        for (const auto &i : cell->face_indices())
           if (cell->face(i)->has_children())
             return true;
     }
-- 
2.39.5