Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

- u -

• unacknowledged_count : DDS_ReliableSampleUnacknowledgedStatus
• unbind : ZCOPY_NotifUserInterfaceI
• unicast_locator : DDS_SubscriptionBuiltinTopicData , DDS_PublicationBuiltinTopicData
• user_data : DDS_DomainParticipantQos , DDS_DataWriterQos , UDP_TransformRule , DDS_ParticipantBuiltinTopicData , DDS_DataReaderQos , DDS_PublicationBuiltinTopicData , DDS_SubscriptionBuiltinTopicData
• user_intf : ZCOPY_NotifInterfaceFactoryProperty
• user_multicast_port_offset : DDS_RtpsWellKnownPorts_t
• user_property : ZCOPY_NotifInterfaceFactoryProperty
• user_traffic : DDS_DomainParticipantQos
• user_unicast_port_offset : DDS_RtpsWellKnownPorts_t