Here are the classes, structs, unions and interfaces with brief descriptions:

Nucxx
Ndata
CAmSend	Data for an Active Message send
CAmReceive	Data for an Active Message receive
CEndpointClose	Data for an endpoint close operation
CFlush	Data for a flush operation
CMemPut	Data for a memory send
CMemGet	Data for a memory receive
CStreamSend	Data for a Stream send
CStreamReceive	Data for an Stream receive
CTagSend	Data for a Tag send
CTagReceive	Data for a Tag receive
CTagReceiveWithHandle	Data for a Tag receive using a message handle
CTagMultiSend	Data for a multi-buffer Tag send
CTagMultiReceive	Data for a multi-buffer Tag receive
Cdispatch
Ninternal
CRecvAmMessage	Handle receiving of a ucxx::RequestAm
CAmData	Active Message data owned by a ucxx::Worker
Npython
Ndetail
CPythonFutureTask	A bridge of C++ and Python futures
CFuture	Specialized Python implementation of a ucxx::Future
CNotifier	Specialized Python implementation of a ucxx::Notifier
CPythonFutureTask	User-facing bridge of C++ and Python futures
CPythonFutureTaskCollector	A garbage-collector for Python futures
CWorker	Specialized Python implementation of a ucxx::Worker
Nutils
CCallbackNotifier
CAddress	Component encapsulating the address of a UCP worker
CAddressBuilder	Builder class for constructing std::shared_ptr<ucxx::Address> objects
CAlreadyExistsError	The exception for UCS_ERR_ALREADY_EXISTS
CAmReceiverCallbackInfo	Information of an Active Message receiver callback
CAmReceiverCallbackOwnerHash	Hash functor for `AmReceiverCallbackOwnerType`
CAmReceiverCallbackOwnerType	Active Message receiver callback owner name (fixed-size)
CAmSendParams	Parameters controlling Active Message send behavior
CBaseDelayedSubmissionCollection	Base type for a collection of delayed submissions
CBuffer	A simple object to simplify managing buffers
CBufferRequest	Container for data required by a ucxx::RequestTagMulti
CBufferTooSmallError	The exception for UCS_ERR_BUFFER_TOO_SMALL
CBusyError	The exception for UCS_ERR_BUSY
CCanceledError	The exception for UCS_ERR_CANCELED
CComponent	A UCXX component class to prevent early destruction of parent object
CConfig	Component encapsulating the UCP configuration
CConnectionResetError	The exception for UCS_ERR_CONNECTION_RESET
CContext	Component encapsulating the UCP context
CContextBuilder	Builder class for constructing std::shared_ptr<ucxx::Context> objects
CDelayedSubmissionCollection	A collection of delayed submissions of multiple types
CEndpoint	Component encapsulating a UCP endpoint
CEndpointBuilder	Builder class for constructing std::shared_ptr<ucxx::Endpoint> objects
CEndpointTimeoutError	The exception for UCS_ERR_ENDPOINT_TIMEOUT
CEpParamsDeleter	Deleter for a endpoint parameters object
CError	The base class for all UCX exceptions
CExceedsLimitError	The exception for UCS_ERR_EXCEEDS_LIMIT
CFirstEndpointFailureError	The exception for UCS_ERR_FIRST_ENDPOINT_FAILURE
CFirstLinkFailureError	The exception for UCS_ERR_FIRST_LINK_FAILURE
CFuture	Represent a future that may be notified by a specialized notifier
CGenericDelayedSubmissionCollection	A collection of delayed submissions of generic callbacks
CHeader	A serializable object containing metadata of multiple buffers
CHostBuffer	A simple object containing a host buffer
CInflightRequests	Handle tracked requests
CInvalidAddrError	The exception for UCS_ERR_INVALID_ADDR
CInvalidParamError	The exception for UCS_ERR_INVALID_PARAM
CIOError	The exception for UCS_ERR_IO_ERROR
CLastEndpointFailureError	The exception for UCS_ERR_LAST_ENDPOINT_FAILURE
CLastLinkFailureError	The exception for UCS_ERR_LAST_LINK_FAILURE
CListener	Component encapsulating a UCP listener
CListenerBuilder	Builder class for constructing std::shared_ptr<ucxx::Listener> objects
CMemoryHandle	Component holding a UCP memory handle
CMemoryHandleBuilder	Builder class for constructing std::shared_ptr<ucxx::MemoryHandle> objects
CMessageTruncatedError	The exception for UCS_ERR_MESSAGE_TRUNCATED
CNoDeviceError	The exception for UCS_ERR_NO_DEVICE
CNoElemError	The exception for UCS_ERR_NO_ELEM
CNoMemoryError	The exception for UCS_ERR_NO_MEMORY
CNoMessageError	The exception for UCS_ERR_NO_MESSAGE
CNoProgressError	The exception for UCS_ERR_NO_PROGRESS
CNoResourceError	The exception for UCS_ERR_NO_RESOURCE
CNotConnectedError	The exception for UCS_ERR_NOT_CONNECTED
CNotifier	Notifier for status of futures
CNotImplementedError	The exception for UCS_ERR_NOT_IMPLEMENTED
COutOfRangeError	The exception for UCS_ERR_OUT_OF_RANGE
CRejectedError	The exception for UCS_ERR_REJECTED
CRemoteKey	Component holding a UCP rkey (remote key)
CRemoteKeyBuilder	Builder class for constructing std::shared_ptr<ucxx::RemoteKey> objects
CRequest	Base type for a UCXX transfer request
CAttributes	Request attributes reported by ucp_request_query
CRequestAm	Send or receive a message with the UCX Active Message API
CRequestAmBuilder	Builder class for constructing std::shared_ptr<ucxx::RequestAm> objects
CRequestBuilderBase	CRTP base for all request builders providing Python future support
CRequestCallbackBuilderBase	CRTP base for request builders that support completion callbacks
CRequestDelayedSubmissionCollection	A collection of delayed request submissions
CRequestEndpointClose	Send or receive a message with the UCX Tag API
CRequestEndpointCloseBuilder	Builder class for constructing std::shared_ptr<ucxx::RequestEndpointClose> objects
CRequestFlush	Flush a UCP endpoint or worker
CRequestFlushBuilder	Builder class for constructing std::shared_ptr<ucxx::RequestFlush> objects
CRequestMem	Send or receive a message with the UCX RMA API
CRequestMemBuilder	Builder class for constructing std::shared_ptr<ucxx::RequestMem> objects
CRequestStream	Send or receive a message with the UCX Stream API
CRequestStreamBuilder	Builder class for constructing std::shared_ptr<ucxx::RequestStream> objects
CRequestTag	Send or receive a message with the UCX Tag API
CRequestTagBuilder	Builder class for constructing std::shared_ptr<ucxx::RequestTag> objects
CRequestTagMulti	Send or receive multiple messages with the UCX Tag API
CRequestTagMultiBuilder	Builder class for constructing std::shared_ptr<ucxx::RequestTagMulti> objects
CShmemSegmentError	The exception for UCS_ERR_SHMEM_SEGMENT
CSomeConnectsFailedError	The exception for UCS_ERR_SOME_CONNECTS_FAILED
CTagProbeInfo	Information about probed tag message
CTagProbeInfoBuilder	Builder class for constructing std::shared_ptr<ucxx::TagProbeInfo> objects
CTagRecvInfo	Information about probed tag message
CTimedOutError	The exception for UCS_ERR_TIMED_OUT
CTrackedRequests	Container for transferring tracked requests between InflightRequests instances
CUnreachableError	The exception for UCS_ERR_UNREACHABLE
CUnsupportedError	The exception for UCS_ERR_UNSUPPORTED
CWorker	Component encapsulating a UCP worker
CAttributes	Worker attributes reported by ucp_worker_query
CWorkerBuilder	Builder class for constructing std::shared_ptr<ucxx::Worker> objects
CWorkerProgressThread	A thread to progress a ucxx::Worker
CStopConfig	Progress thread stop synchronization configuration