C++ return different objects

Question

i have a big problem.. I wonna select the Storage Service via a wrapper class. The returning value must be an object within the storage service class. I pasted my current approa

Answer 1

Error return Auto in test(),it's return two different types. Change by StorageTemplate*

class controller {
    public:
        StorageTemplate* test(int select) {
            if( select == 1)
            {
                return new SQL(); 
            } else {
                return new REDIS();
            }
        }
};