デザイン パターンを高性能 C++ コードに適用する

class SortStrategy {
public:
    virtual void sort(std::vector<int>& data) = 0;
};

class BubbleSort : public SortStrategy {
    void sort(std::vector<int>& data) override {
        // 执行冒泡排序算法
    }
};

class QuickSort : public SortStrategy {
    void sort(std::vector<int>& data) override {
        // 执行快速排序算法
    }
};

class Approver {
public:
    virtual bool approve(const Request& request) const = 0;
    virtual Approver* getNextApprover() const = 0;
};

class Supervisor : public Approver {
    bool approve(const Request& request) const override {
        if (request.getAmount() < 1000) {
            return true;
        } else {
            return getNextApprover()->approve(request);
        }
    }
    Approver* getNextApprover() const override {
        return m_manager;
    }

private:
    Manager* m_manager;
};

class Manager : public Approver {
    bool approve(const Request& request) const override {
        if (request.getAmount() < 5000) {
            return true;
        } else {
            return getNextApprover()->approve(request);
        }
    }
    Approver* getNextApprover() const override {
        return m_ceo;
    }

private:
    CEO* m_ceo;
};

class CEO : public Approver {
    bool approve(const Request& request) const override {
        return true;
    }
    Approver* getNextApprover() const override {
        return nullptr;
    }
};

void processRequest(const Request& request) {
    Approver* supervisor = new Supervisor();
    Approver* manager = new Manager();
    Approver* ceo = new CEO();

    supervisor->setNextApprover(manager);
    manager->setNextApprover(ceo);

    if (supervisor->approve(request)) {
        // 请求已批准
    }
}