设计模式14-责任链模式

我只需要把请求交给我的直接上级，他能不能处理，或者他转交给他的上级处理，我不关心

我是一个职员，我的直接上级是GroupManager，再往上还有ProjectManager， CEO，我只需要把我的请求交给直接上级，他们会层层审批，直到遇到能够最终做决定的人

#include <iostream>
#include <cstdint>

enum class req: uint8_t {
    emRest,
    emLongHoliday,
    emResign
};

class abstructManager {
public:
    void setNext(abstructManager* next) {
        m_next = next;
    }
    virtual std::string postReq(req r) = 0;
    virtual ~abstructManager() {}
protected:
    abstructManager* m_next;
};

class GroupManager : public abstructManager {
public:
    std::string postReq(req r) override {
        switch(r) {
            case req::emRest:
                return "GM:好好休息";
            case req::emLongHoliday:
            case req::emResign:
                return m_next->postReq(r);
        }
    }
};
class ProjectManager : public abstructManager {
public:
    std::string postReq(req r) override {
        switch(r) {
            case req::emRest:
                return "PM:批准";
            case req::emLongHoliday:
                return "PM:项目比较忙，下次给你调休";
            case req::emResign:
                return m_next->postReq(r);
        }
    }
};

class CEO : public abstructManager {
public:
    std::string postReq(req r) override {
        switch(r) {
            case req::emRest:
                return "CEO:行，但是要扣工资";
            case req::emLongHoliday:
                return "CEO:大家都没休息，努力奋斗啊";
            case req::emResign:
                return "CEO:别走了，明年给你涨工资";
        }
    }
};

int main() {

    GroupManager gm;
    ProjectManager pm;
    CEO cm;

    gm.setNext(&pm);
    pm.setNext(&cm);

    std::cout << gm.postReq(req::emRest) << std::endl;
    std::cout << gm.postReq(req::emLongHoliday) << std::endl;
    std::cout << gm.postReq(req::emResign) << std::endl;
    return 0;
}