return a table

include/deal.II/fe/fe_q_iso_q1.h

@@ -159,6 +159,13 @@ class FE_Q_iso_Q1 : public FE_Q_Base<dim, spacedim>
     const std::vector<Vector<double>> &support_point_values,
     std::vector<double>               &nodal_values) const override;
 
+  /**
+   * Override the function to specify the subset of dofs that are really
+   * coupling for each "sub" cell.
+   */
+  virtual const Table<2, bool> &
+  get_local_dof_sparsity_pattern() const override;
+
   /**
    * @name Functions to support hp
    * @{
@@ -172,10 +179,20 @@ class FE_Q_iso_Q1 : public FE_Q_Base<dim, spacedim>
                          const unsigned int codim = 0) const override final;
 
   /** @} */
+
+private:
+  Table<2, bool> local_dof_sparsity_pattern;
 };
 
 
 
+template <int dim, int spacedim>
+inline const Table<2, bool> &
+FE_Q_iso_Q1<dim, spacedim>::get_local_dof_sparsity_pattern() const
+{
+  return local_dof_sparsity_pattern;
+}
+
 /** @} */
 
 DEAL_II_NAMESPACE_CLOSE