+void to_api(const boost::asio::ip::address_v4& a, vapi_type_ip4_address& v);
+void to_api(const boost::asio::ip::address_v6& a, vapi_type_ip6_address& v);
+void to_api(const boost::asio::ip::address& a,
+ vapi_union_address_union& u,
+ vapi_enum_address_family& af);
+void to_api(const boost::asio::ip::address& a, vapi_union_address_union& u);
+vapi_enum_address_family to_api(const l3_proto_t p);