Proxy pattern: Difference between revisions

Revision as of 14:16, 23 May 2019

Revision as of 08:35, 4 July 2019

Line 218:

=== C++ ===

<source lang=Cpp>

#include <iostream>

#include <memory>

class ICar {

public:

virtual ~ICar() { std::cout << "ICar destructor!" << std::endl; }

virtual void DriveCar() = 0;

virtual ~ICar () {

std::cout << "ICar destructor!" << std::endl;

}

};

class Car : public ICar {

public:

void DriveCar() override {

void DriveCar() override { std::cout << "Car has been driven!" << std::endl; }

}

};

class ProxyCar : public ICar {

public:

private:

ProxyCar (int driver_age) : realCar(new Car()), _driver_agedriver_age_(driver_age) {}

ICar* realCar;

int _driver_age;

public:

ProxyCar (int driver_age) : realCar(new Car()), _driver_age(driver_age) {}

~ProxyCar () {

delete realCar;

}

void DriveCar() {

if (_driver_agedriver_age_ > 16) {

realCarreal_car_->DriveCar();

} else {

std::cout << "Sorry, the driver is too young to drive." << std::endl;

}

}

private:

std::unique_ptr<ICar> real_car_ = std::make_unique<Car>();

int driver_age_;

};

int main() {

// How to use above Proxy class?

std::unique_ptr<ICar*> car = new std::make_unique<ProxyCar>(16);

int main()

void car->DriveCar() override {;

{

ICar* car = new ProxyCar(16);

car->DriveCar();

delete car;

car = new std::make_unique<ProxyCar>(25);

car->DriveCar();

delete car;

}

</source>