amoeba commented on code in PR #45951:
URL: https://github.com/apache/arrow/pull/45951#discussion_r2020318572
##########
r/src/arrow_types.h:
##########
@@ -173,14 +173,39 @@ template <typename RVector>
class RBuffer : public MutableBuffer {
public:
explicit RBuffer(RVector vec)
- : MutableBuffer(reinterpret_cast<uint8_t*>(DATAPTR(vec)),
+ : MutableBuffer(reinterpret_cast<uint8_t*>(getDataPointer(vec)),
vec.size() * sizeof(typename RVector::value_type),
arrow::CPUDevice::memory_manager(gc_memory_pool())),
vec_(vec) {}
private:
// vec_ holds the memory
RVector vec_;
+
+ static void* getDataPointer(RVector& vec) {
+ if (TYPEOF(vec) == LGLSXP) {
+ return LOGICAL(vec);
+ } else if (TYPEOF(vec) == INTSXP) {
+ return INTEGER(vec);
+ } else if (TYPEOF(vec) == REALSXP) {
+ return REAL(vec);
+ } else if (TYPEOF(vec) == CPLXSXP) {
+ return COMPLEX(vec);
+ } else if (TYPEOF(vec) == STRSXP) {
+ cpp11::writable::strings out(Rf_xlength(vec));
+ R_xlen_t len = Rf_xlength(vec);
+
+ for (R_xlen_t i = 0; i < len; i++) {
+ SEXP str_elt = reinterpret_cast<SEXP>(STRING_ELT(vec, i));
+ out[i] = str_elt;
+ }
+
+ return out;
Review Comment:
Just doing `return STRING_ELT(vec, 0)` actually makes sense to me since it
looks like we just need a pointer to the same address as what we'd get with
DATAPTR. Seems like that's what `STRING_ELT(vec, 0)` should accomplish. It does
seem like a strange way to do it but it also seems like what we're doing here
is already breaking the rules CRAN wants us to play by. If it works, I'm +1.
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