Method Dataptr

r/src/altrep.cpp:889–891

  }

  static void* Dataptr(SEXP alt, Rboolean writeable) {
    return const_cast<void*>(DATAPTR_RO(Materialize(alt)));
  }

  static SEXP Materialize(SEXP alt) {
    if (Base::IsMaterialized(alt)) {