[datatable-help] How to use datatable in S4 class?

[Peter Jackson]

The following command
setClass("ClusterGroup",representation=representation(dtDemand="data.table"))
results in 
Warning message:
undefined slot classes in definition of "ClusterGroup": dtDemand(class
"data.table") 

I assume this means the class does not recognize data.table. Is there way to
use data.table's in slots?
Thanks, Peter
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