设计模式观后（c++还原之二 依赖的信用）

//言而无信，高低层依赖模块
class ICar {
public:
virtual void run() {
cout << "car run!";
}
};

class Benz : public ICar {
public:
virtual void run() {
cout << "benz run";
}
};

class BMW : public ICar {
public:
virtual void run() {
cout << "bmw run";
}
};
//司机, 并非所有司机能开车，为了避免这种言而无信的情况
//专门写个类，用于继承。如此他们的依赖是可信的
class IDriver
{
public:
virtual void drive(ICar* car);
};

class Driver : public IDriver {
public:
virtual void drive(ICar* car) {
//为了添加依赖，做run
car->run();
cout << "driver car";
}
};

class Client {
public:
void dmain() {
IDriver* wang = new Driver;
ICar* benz = new Benz;
wang->drive(benz);
}
};