+/**
+ * \ingroup XBT_log_implem
+ * \param cat the category (not only its name, but the variable)
+ * \param lay the layout
+ *
+ * Programatically sets the category's layout.
+ * (the prefered interface is throught xbt_log_control_set())
+ *
+ */
+XBT_PUBLIC(void) xbt_log_layout_set(xbt_log_category_t cat,
+ xbt_log_layout_t lay);