RefPtrIn this example, we create an instance of MyObject using the RefPtr and then call the toJSONString method to convert it into a JSON formatted string. The resulting string is stored in the jsonStr variable. The package library that contains the RefPtr and toJSONString method is likely a custom or third-party library used in the C++ program. It is not a part of the standard C++ library.obj = new MyObject(); std::string jsonStr = obj->toJSONString();