Merge pull request #14660 from bangerth/array

diff --cc include/deal.II/base/data_out_base.h
index d69807980319ccd9e0d77b404038817a32a4d53b,cbd8f40841c61c0b08bff28ebecfeca83aee4b29..da5e5bb3af3c69fe0d1a8088585bbd78e9f089a3
--- 1/include/deal.II/base/data_out_base.h
--- 2/include/deal.II/base/data_out_base.h
+++ b/include/deal.II/base/data_out_base.h
@@@ -281,13 -281,8 +281,13 @@@ namespace DataOutBas
       *
       * The order of points is the same as for cells in the
       * triangulation.
 +     *
 +     * @note This array is sized to accommodate the maximal number of vertices
 +     *   one might encounter in a cell, namely those for a hypercube cell.
 +     *   For other kinds of cells (triangles, tetrahedra, etc.), only the
 +     *   first few elements of this array will be used.
       */
-     Point<spacedim> vertices[GeometryInfo<dim>::vertices_per_cell];
+     std::array<Point<spacedim>, GeometryInfo<dim>::vertices_per_cell> vertices;
  
      /**
       * Patch indices of neighbors of the current patch. This is made available