Function WideStringToUTF8Internal

cpp/src/arrow/util/utf8.cc:139–147

}

std::string WideStringToUTF8Internal(const std::wstring& source) {
  std::string s;
#if WCHAR_MAX > 0xFFFF
  ::utf8::utf32to8(source.begin(), source.end(), std::back_inserter(s));
#else
  ::utf8::utf16to8(source.begin(), source.end(), std::back_inserter(s));
#endif
  return s;
}

std::string UTF16StringToUTF8Internal(std::u16string_view source) {
  std::string s;