Use numbers::invalid_unsigned_int.

diff --git a/source/grid/tria.cc b/source/grid/tria.cc
index f4603be4c70f7ac5d7588a56da135a2aea2c022f..de3681962d4333530b08605532e3bd16e89feae5 100644 (file)
--- a/source/grid/tria.cc
+++ b/source/grid/tria.cc
@@ -3583,7 +3583,7 @@ namespace internal
 
         const unsigned int max_faces_per_cell = 2 * dim;
 
-        level.active_cell_indices.assign(size, -1);
+        level.active_cell_indices.assign(size, numbers::invalid_unsigned_int);
         level.subdomain_ids.assign(size, 0);
         level.level_subdomain_ids.assign(size, 0);