I've been using the strategy I outlined last month ( 
http://lists.r-forge.r-project.org/pipermail/rcpp-devel/2011-December/003226.html
 ) for some time now. It is pretty similar to Jelmer's, but makes sure that R 
owns the object when a C++ class wrapped into an S4 class. Note that the copy 
constructor must be shallow. I am interested in feedback.

Ian
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