[Rd] Reference Classes copy(shallow=FALSE) unexpected behavior.

Hadley Wickham 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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