Fix an assert: It should read "nullptr", not "null_ptr"

diff --git a/include/deal.II/distributed/grid_tools.h b/include/deal.II/distributed/grid_tools.h
index 89d0d17dd5ed32140aa18868650de8dc22f3a129..116b40e11639915f52cbbb27d17bf8a11874cb23 100644 (file)
--- a/include/deal.II/distributed/grid_tools.h
+++ b/include/deal.II/distributed/grid_tools.h
@@ -207,7 +207,7 @@ namespace parallel
       constexpr int spacedim = MeshType::space_dimension;
       auto tria =
         static_cast<const parallel::Triangulation<dim, spacedim>*>(&mesh.get_triangulation());
-      Assert (tria != null_ptr,
+      Assert (tria != nullptr,
               ExcMessage("The function exchange_cell_data_to_ghosts() only works with parallel triangulations."));
 
       // map neighbor_id -> data_buffer where we accumulate the data to send