[Rd] Reference Classes copy(shallow=FALSE) unexpected behavior.
hadley at rice.edu
Wed May 11 23:33:39 CEST 2011
> But the general problem is tricky. What about reference objects contained
> in attributes or slots of other objects, etc? What is needed for total
> copying is a switch in the low-level duplication code that says to copy
> reference objects. It's also possible that one does NOT want all such
> objects copied.
Good point. I wonder what other languages do? And in fact, are there
any other languages that mix mutable and non-mutable objects in this
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
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