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A data.table can be used in S4 class definitions as either a parent class (inside a contains argument of setClass), or as an element of an S4 slot.


Steve Lianoglou

See also


## Used in inheritance.
setClass('SuperDataTable', contains='data.table')

## Used in a slot
setClass('Something', representation(x='character', dt='data.table'))
x <- new("Something", x='check', dt=data.table(a=1:10, b=11:20))