/**
 * @name 责任链模式
 * @brief: 使多个对象都有机会处理请求
 * @note 场景：日志过滤系统、审批流程、异常处理链
 */

class Handler {
public:
    virtual void handleRequest(int level) = 0;
    void setNext(Handler* h) { next = h; }
protected:
    Handler* next = nullptr;
};

class Manager : public Handler {
public:
    void handleRequest(int level) override {
        if (level <= 5) {
            // 处理请求
        } else if (next) {
            next->handleRequest(level);
        }
    }
};

class Director : public Handler {
    void handleRequest(int level) override {
        if (level > 5 && level <= 10) {
            // 处理请求
        } else if (next) {
            next->handleRequest(level);
        }
    }
};

// 使用
int main()
{
    Handler* manager = new Manager();
    Handler* director = new Director();
    manager->setNext(director);

    manager->handleRequest(3);  // Manager处理
    manager->handleRequest(7);  // Director处理
}