thisisnic commented on PR #48634:
URL: https://github.com/apache/arrow/pull/48634#issuecomment-3689372418
Alternative approach to try based on conversation with CRAN folks:
> The other one is tricky (L152 , 1163, 1194) - you are trying to get the
class name of the altrep object for which there is no API AFAICT. ...A
workaround is to use something like:
```
const char *altrep_class_name(SEXP x) {
SEXP l = PROTECT(Rf_lang2(Rf_install(".Internal"),
PROTECT(Rf_lang2(Rf_install("altrep_class"), x))));
SEXP r = Rf_eval(l, R_BaseEnv);
UNPROTECT(2);
return CHAR(STRING_ELT(r, 0));
}
```
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