Any pointer on how to cast std::string into cpp11::writables::raws

Building a BigQuery Storage Client.

Using message.SerializeToString gets me a std::string but I actually want that to remains in raws format instead character when returning to R.

See here : https://github.com/meztez/bigrquerystorage/blob/77102bd8f34080869580e174e81e49875a4833a1/src/bqs.cpp#L152

Willl keep reading doc, but if someone any has pointer. That would be great.

Or a uint_8t array into raws

cpp11::raws to_raw(const std::string input) {
  cpp11::writable::raws rv(input.size());
  for(unsigned long i=0; i<input.size(); i++) {
    rv[i] = input.c_str()[i];
  }
  return rv;
}

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