Hi Gregor, I don't think it's possible at this point. Some technical details follow:
All R data internally is a SEXPREC, ie, a C struct full of different bits of information. The data part of a SEXPREC is forced to a specific offset from the C structure, e.g. from Rinternals.h: /* Under the generational allocator the data for vector nodes comes immediately after the node structure, so the data address is a known offset from the node SEXP. */ #define DATAPTR(x) (((SEXPREC_ALIGN *) (x)) + 1) Since Rcpp objects are just proxy wrappers over R objects, for Rcpp to be able to reuse memory, we would have to construct the SEXPREC in the correct memory location so that the resulting DATAPTR call happens to fall where the data is. However, I'm not sure how we could reserve that space for the SEXPREC. Other data structures that just contain a pointer to their data, rather than requiring that they lie a specified offset away, don't have this problem (I imagine this is why e.g. Armadillo can reuse memory) Maybe others have more thoughts. Cheers, Kevin _______________________________________________ Rcpp-devel mailing list Rcpp-devel@lists.r-forge.r-project.org https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
