How to create matlab::da​ta::CharAr​rayRef for matlab::data::CharArray?

I'm using the C++ (not C!) MATLAB Data API from MATLAB R2019b. I would like to handle data referenced by a matlab::data::CharArray and a matlab::data::CharArrayRef in the same manner, i.e. I would like to implement something such as the following in C++ without using code duplication:

std::string toString(matlab::data::CharArray const& in) {

// TODO(2021-12-13 by wolters): How-to create `CharArrayRef` from

// `CharArray` in order to call the other toString function and avoid

// code duplication?

auto const multiByte = in.toUTF16();

return std::string{multiByte.begin(), multiByte.end()};

}

std::string toString(matlab::data::CharArrayRef const& in) {

auto const multiByte = in.toUTF16();

return std::string{multiByte.begin(), multiByte.end()};

}

I've tried a lot, but can't find a way to create an instance of matlab::data::CharArrayRef from an existing matlab::data::CharArray. (the same applies to other data types of the MATLAB Data API). Do you know how to achieve that?