【软件设计师备考 专题 】计算机专业英语：掌握基本词汇和阅读理解技巧（三）

// 抽象观察者类
class Observer {
public:
    virtual void update() = 0;
};
// 具体观察者类A
class ConcreteObserverA : public Observer {
public:
    void update() override {
        // 更新操作
    }
};
// 具体观察者类B
class ConcreteObserverB : public Observer {
public:
    void update() override {
        // 更新操作
    }
};
// 抽象主题类
class Subject {
private:
    std::vector<Observer*> observers;
public:
    void attach(Observer* observer) {
        observers.push_back(observer);
    }
    void detach(Observer* observer) {
        // 移除操作
    }
    void notify() {
        for (auto observer : observers) {
            observer->update();
        }
    }
};
int main() {
    Subject subject;
    Observer* observerA = new ConcreteObserverA();
    Observer* observerB = new ConcreteObserverB();
    subject.attach(observerA);
    subject.attach(observerB);
    // 主题状态发生变化时，调用subject.notify()通知观察者
    return 0;
}

// 抽象原型类
class Prototype {
public:
    virtual Prototype* clone() = 0;
};
// 具体原型类A
class ConcretePrototypeA : public Prototype {
public:
    Prototype* clone() override {
        return new ConcretePrototypeA(*this);
    }
};
// 具体原型类B
class ConcretePrototypeB : public Prototype {
public:
    Prototype* clone() override {
        return new ConcretePrototypeB(*this);
    }
};
int main() {
    Prototype* prototypeA = new ConcretePrototypeA();
    Prototype* cloneA = prototypeA->clone();
    // 使用cloneA对象进行操作
    return 0;
}

// 目标接口
class Target {
public:
    virtual void request() = 0;
};
// 适配者类
class Adaptee {
public:
    void specificRequest() {
        // 具体操作
    }
};
// 类适配器
class Adapter : public Target, private Adaptee {
public:
    void request() override {
        specificRequest();
    }
};
int main() {
    Target* target = new Adapter();
    target->request();
    return 0;
}