设计模式--外观模式

外观模式

外观模式是一个子系统的封装，通过访问外观来实现访问子系统。只要定义好了这个接口，来创造出新的子系统是非常容易。

#include <iostream>using namespace std;class fact_one{public:    void sell(){        cout<<"sell fact_one"<<endl;    }       void buy(){        cout<<"buy fact_one"<<endl;    }   };class fact_two{public:    void sell(){        cout<<"sell fact_two"<<endl;    }       void buy(){        cout<<"buy fact_two"<<endl;    }   };class lead{public:    lead(){        one = new fact_one();        two = new fact_two();    }    void sell(){        one->sell();        two->sell();    }    void buy(){        one->buy();        two->buy();    }private:    fact_one *one;    fact_two *two;};int main(int argc, char *argv[]){    lead *leader = new lead();    leader->sell();    return 0;}