- u -

• UnacknowledgedSampleCount : ReliableWriterCacheChangedStatus
• UnacknowledgedSampleCountPeak : ReliableWriterCacheChangedStatus
• UncommittedSampleCount : DataReaderProtocolStatus
• Unicast : DataWriterQos , DataReaderQos
• UnicastLocators : PublicationBuiltinTopicData , SubscriptionBuiltinTopicData
• Unknown : Guid , SampleIdentity
• UnregisteredInstanceCount : DataWriterCacheStatus
• UnregisteredInstanceCountPeak : DataWriterCacheStatus
• UrlProfile : Profile , ProfileBuilder
• UserData : DomainParticipantQos , DataWriterQos , DataReaderQos , ParticipantBuiltinTopicData , PublicationBuiltinTopicData , SubscriptionBuiltinTopicData
• UserMulticastPortOffset : RtpsWellKnownPorts , RtpsWellKnownPortsBuilder
• UserUnicastPortOffset : RtpsWellKnownPorts , RtpsWellKnownPortsBuilder
• UseSharedExclusiveArea : ExclusiveArea , ExclusiveAreaBuilder