gras_datadesc_type_t
gras_datadesc_dynar(gras_datadesc_type_t elm_t,
void_f_pvoid_t *free_func);
+gras_datadesc_type_t
+ gras_datadesc_matrix(gras_datadesc_type_t elm_t,
+ void_f_pvoid_t * const free_f);
/*********************************
* Change stuff within datadescs *