This is an empty abstract class. I used it as a way to group subclasses so that I can pass them as arguments to function.

AbstractDataRequest.h

#ifndef TVASTRCPP_ABSTRACTDATAREQUEST_H
#define TVASTRCPP_ABSTRACTDATAREQUEST_H


class AbstractDataRequest {
    virtual ~dummyFunc() = 0;
};


#endif //TVASTRCPP_ABSTRACTDATAREQUEST_H


AbstractDataRequest::~dummyFunc(){};