+format_function_t format_ip46_address;
+
+typedef enum {
+ IP46_TYPE_ANY,
+ IP46_TYPE_IP4,
+ IP46_TYPE_IP6
+} ip46_type_t;
+/* unformat_ip46_address expects arguments (ip46_address_t *, ip46_type_t)
+ * The type argument is used to enforce a particular IP version. */