Fix compiler warnings for old clang

diff --git a/include/deal.II/grid/reference_cell.h b/include/deal.II/grid/reference_cell.h
index 49e2033ccdfe8f149329a894c70da2b41d2f02e1..c5f6b4d5e4ed889c6248a6b8b7b621959353f245 100644 (file)
--- a/include/deal.II/grid/reference_cell.h
+++ b/include/deal.II/grid/reference_cell.h
@@ -162,7 +162,7 @@ namespace ReferenceCell
 
           (void)vertex;
 
-          return {0u, 0u};
+          return {{0u, 0u}};
         }
 
         /**
@@ -175,7 +175,7 @@ namespace ReferenceCell
 
           (void)line;
 
-          return {0, 0};
+          return {{0, 0}};
         }
 
         /**