[Rd] Transferring ownership of R-managed buffer

Tim Keitt tkeitt at utexas.edu
Wed Mar 29 17:24:18 CEST 2017

I have a use case where I would like to create an SEXP around an existing
buffer that is managed by R, thus avoiding a copy operation. If I have
something like:

void *p = (void*) RAW(PROTECT(Rf_allocVector(RAWSXP, n)));
... additional maniupulation ...
SEXP x = somefunc(SXPTYPE, n, p);  // ????

Is there a "placement" constructor available? (I have arranged for the
corresponding UNPROTECT.) I've looked at and experimented with R_allocator
and allocVector3, but can't quite get it right. I know this is odd, but it
makes sense for my use case.

Thanks for any pointers.



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