message: Added empty constructor for Configuration
diff: @@ -31,6 +31,8 @@ struct Configuration {
  std::size_t r_edges, std::size_t r_triangles, std::size_t r_tetrahedra)
  : toggle_edges(t_edges), toggle_triangles(t_triangles), toggle_tetrahedra(t_tetrahedra),
  ref_edges(r_edges), ref_triangles(r_triangles), ref_tetrahedra(r_tetrahedra) {}
  +
  + Configuration() {}
  };
  