#include #include using namespace std; class clsTravel { public: enum class enmTransportMode { Road = 0, Rail = 1, Air = 2 }; clsTravel(); virtual ~clsTravel(); virtual void display() = 0; static clsTravel* GetTravelObject(enmTransportMode); }; clsTravel::clsTravel() { cout << "Base constructor (clsTravel) called" << endl; } clsTravel::~clsTravel() { cout << "Base destructor (clsTravel) called" << endl; } void clsTravel::display() { cout << "Welcome to Travel portal" << endl; } class clsByRoad : public clsTravel { public: clsByRoad(); ~clsByRoad(); void display() override; }; clsByRoad::clsByRoad() { cout << "Derived constructor (clsByRoad) called" << endl; } clsByRoad::~clsByRoad() { cout << "Derived destructor (clsByRoad) called" << endl; } void clsByRoad::display() { cout << "------>Welcome to road transportation mode.." << endl; } class clsByRail : public clsTravel { public: clsByRail(); ~clsByRail(); void display() override; }; clsByRail::clsByRail() { cout << "Derived constructor (clsByRail) called" << endl; } clsByRail::~clsByRail() { cout << "Derived destructor (clsByRail) called" << endl; } void clsByRail::display() { cout << "------>Welcome to rail transportation mode.." << endl; } class clsByAir : public clsTravel { public: clsByAir(); ~clsByAir(); void display() override; }; clsByAir::clsByAir() { cout << "Derived constructor (clsByAir) called" << endl; } clsByAir::~clsByAir() { cout << "Derived destructor (clsByAir) called" << endl; } void clsByAir::display() { cout << "------>Welcome to air transportation mode.." << endl; } clsTravel* clsTravel::GetTravelObject(enmTransportMode ienmTransportMode) { if(ienmTransportMode == enmTransportMode::Road) return new clsByRoad(); else if(ienmTransportMode == enmTransportMode::Rail) return new clsByRail(); else if(ienmTransportMode == enmTransportMode::Air) return new clsByAir(); return nullptr; } int main() { //Road unique_ptr p1 = unique_ptr(clsTravel::GetTravelObject(clsTravel::enmTransportMode::Road)); p1->display(); cout << endl << endl; //Rail unique_ptr p2 = unique_ptr (clsTravel::GetTravelObject(clsTravel::enmTransportMode::Rail)); p2->display(); cout << endl << endl; //Air unique_ptr p3 = unique_ptr(clsTravel::GetTravelObject(clsTravel::enmTransportMode::Air)); p3->display(); cout << endl << endl; return 0; }

FactoryPatternImproved_1