[Rd] serialization of external pointers

[Romain Francois]

Hello,

I'm looking for examples of how to handle serialization of external 
pointers.

We use external pointers intensively in Rcpp for modules and one popular 
request is to have persistence. And I guess we need to be able to 
serialize/deserialize external pointers for this.

Also, module objects are all instances of reference classes, so maybe 
that can be handled at the R level ?

Romain

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Romain Francois
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