+/**
+ * \ingroup XBT_log_implem
+ * \param cat the category (not only its name, but the variable)
+ * \param parent the parent cat
+ *
+ * Programatically alter a category's parent (don't use).
+ */
+XBT_PUBLIC void xbt_log_parent_set(xbt_log_category_t cat, xbt_log_category_t parent);