Fix a hardcoded number of lines.

diff --git a/include/deal.II/grid/tria_accessor.templates.h b/include/deal.II/grid/tria_accessor.templates.h
index 467241a4a39d423be24647b0ba17960c266c8635..ed0e211ca3a80586009b7e3c11b1607b28bfa205 100644 (file)
--- a/include/deal.II/grid/tria_accessor.templates.h
+++ b/include/deal.II/grid/tria_accessor.templates.h
@@ -1879,7 +1879,7 @@ TriaAccessor<structdim, dim, spacedim>::set_all_boundary_ids(
       case 2:
         // for boundary quads also set
         // boundary_id of bounding lines
-        for (unsigned int i = 0; i < 4; ++i)
+        for (unsigned int i = 0; i < this->n_lines(); ++i)
           this->line(i)->set_boundary_id(boundary_ind);
         break;