工厂模式--c++实现

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1、基类与子类（state_init、state_routing、state_exexute：将要通过工厂生产的子类）

class state
{
    public:
        virtual void process() = 0;
};

class state_init : virtual public state
{
    public:
        virtual void process(){
            cout << "state_init. process" << endl;
        }
};

class state_routing : virtual public state
{
    public:
        virtual void process(){
            cout << "state_routing. process" << endl;
        }
};

class state_execute : virtual public state
{
    public:
        virtual void process(){
            cout << "state_execute. process" << endl;
        }
};

2、工厂类

class statefactory
{
    public:
        static state* generate_state(const string& operate){
            if (operate == "init"){
                return new state_init();
            }else if (operate == "routing"){
                return new state_routing();
            }else if (operate == "execute"){
                return new state_execute();
            }else{
                return NULL;
            }
        }

};

3、应用

int main()
{
    state* pinit = statefactory::generate_state("init");
    state* proute = statefactory::generate_state("routing");
    state* pexecute = statefactory::generate_state("execute");

    if (pinit){
        pinit->process();
        delete pinit;
        pinit = NULL;
    }else{
        cout << "pinit is null" << endl;
    }

    if (proute){
        proute->process();
        delete proute;
        proute = NULL;
    }else{
        cout << "proute is null" << endl;
    }

    if (pexecute){
        pexecute->process();
        delete pexecute;
        pexecute = NULL;
    }else{
        cout << "pexecute is null" << endl;
    }

    return 0;
}

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