Construct with specified service name for any protocol.

basic_resolver_query(
    const std::string & service_name,
    int flags = passive|address_configured);

basic_resolver_query(
    const protocol_type & protocol,
    const std::string & service_name,
    int flags = passive|address_configured);

basic_resolver_query(
    const std::string & host_name,
    const std::string & service_name,
    int flags = address_configured);

basic_resolver_query(
    const protocol_type & protocol,
    const std::string & host_name,
    const std::string & service_name,
    int flags = address_configured);