#include<iostream>#include<string>#include<vector>using namespace std; class AbstractBuilding{public: virtual void sale() = 0; virtual string getQuality() = 0; }; class BuildingA :public AbstractBuilding{public:  BuildingA() { mQulity = "高品質"; }  virtual void sale() { cout << "樓盤A" << mQulity << "被售賣!" << endl; }  virtual string getQuality() { return mQulity; } public: string mQulity;};  class BuildingB :public AbstractBuilding{public:  BuildingB() { mQulity = "低品質"; }  virtual void sale() { cout << "樓盤B" << mQulity << "被售賣!" << endl; }  virtual string getQuality() { return mQulity; } public: string mQulity;}; // 中介類class Mediator{public: Mediator() { AbstractBuilding* building = new BuildingA; vBuilding.push_back(building); building = new BuildingB; vBuilding.push_back(building); }  // 對外提供接口 AbstractBuilding* findMyBuilding(string quality) { for (vector<AbstractBuilding*>::iterator it = vBuilding.begin();  it != vBuilding.end(); it++) {  if ((*it)->getQuality() == quality)  {  return *it;  } }  return NULL; }  ~Mediator() { for (vector<AbstractBuilding*>::iterator it = vBuilding.begin();  it != vBuilding.end(); it++) {  if (*it != NULL)  delete *it; } }public: vector<AbstractBuilding*> vBuilding;};  void test01(){ Mediator* mediator = new Mediator;  AbstractBuilding* building = mediator->findMyBuilding("低品質");  if (building != NULL) { building->sale();  } else { cout << "沒有符號條件的樓盤" << endl; } } int main(){ test01(); system("pause");}