- u -

• unacknowledged_sample_count : DDS::ReliableWriterCacheChangedStatus
• unacknowledged_sample_count_peak : DDS::ReliableWriterCacheChangedStatus
• user_data : DDS::PublicationBuiltinTopicData , DDS::ParticipantBuiltinTopicData , DDS::DataReaderQos , DDS::DataWriterQos , DDS::DomainParticipantQos , DDS::SubscriptionBuiltinTopicData