This inheritance list is sorted roughly, but not completely, alphabetically:
ColDatum
RcppDate
RcppDatetime
RcppDatetimeVector
RcppDateVector
RcppFrame
RcppFunction
MyRListFunc
MyRVectorFunc
RcppMatrix< T >
RcppMatrixView< T >
RcppNumList
RcppParams
RcppResultSet
RcppStringVector
RcppStringVectorView
RcppVector< T >
RcppVectorView< T >