为各个子系统提供一个简明一致的界面,隐藏系统的饿复杂性,使子系统更加易用,是子系统一组接口的包装
class SubSystem1{public: void Operation(){}}; class SubSystem2{public: void Operation(){}};class Facade{public: void OperationWarpper() { s1.Operation(); s2.Operation(); }private: SubSystem1 s1; SubSystem2 s2;};int main(int argc, char *argv[]){ Facade *facade = new Facade; facade->OperationWarpper(); return 0;}