45 lines
1008 B
C++
45 lines
1008 B
C++
/**
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* @name 责任链模式
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* @brief: 使多个对象都有机会处理请求
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* @note 场景：日志过滤系统、审批流程、异常处理链
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*/
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class Handler {
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public:
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virtual void handleRequest(int level) = 0;
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void setNext(Handler* h) { next = h; }
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protected:
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Handler* next = nullptr;
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};
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class Manager : public Handler {
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public:
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void handleRequest(int level) override {
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if (level <= 5) {
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// 处理请求
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} else if (next) {
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next->handleRequest(level);
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}
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}
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};
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class Director : public Handler {
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void handleRequest(int level) override {
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if (level > 5 && level <= 10) {
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// 处理请求
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} else if (next) {
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next->handleRequest(level);
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}
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}
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};
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// 使用
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int main()
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{
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Handler* manager = new Manager();
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Handler* director = new Director();
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manager->setNext(director);
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manager->handleRequest(3); // Manager处理
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manager->handleRequest(7); // Director处理
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} |