#include <iostream>#include <vector>using namespace std;#define SHARE_FLAG string#define DESTROY_POINTER(ptr) if (ptr) { delete ptr; ptr = NULL; }class Flyweight{public:    Flyweight(SHARE_FLAG flag) : m_shareFlag(flag) {}    virtual void Operation()=0;    virtual SHARE_FLAG GetShareFlag() { return m_shareFlag; }protected:    SHARE_FLAG m_shareFlag;};class ConcreteFlyweight : public Flyweight{public:    ConcreteFlyweight(SHARE_FLAG flag) : Flyweight(flag) {}    ~ConcreteFlyweight() {}    void Operation() { cout<<"share flag:"<<m_shareFlag<<endl; }};class FactoryFlyweight{public:    FactoryFlyweight() {}    ~FactoryFlyweight();    Flyweight* CreateFlyweight(SHARE_FLAG flag);private:    vector<Flyweight*> m_objectList;};FactoryFlyweight::~FactoryFlyweight(){    for (unsigned int i = 0; i < m_objectList.size(); i++)    {        Flyweight* pTmp = m_objectList[i];        DESTROY_POINTER(pTmp);    }    m_objectList.clear();}Flyweight* FactoryFlyweight::CreateFlyweight(SHARE_FLAG flag){    for (unsigned int i = 0; i < m_objectList.size(); i++)    {        if (m_objectList[i]->GetShareFlag() == flag)        {            cout<<"cache object["<<m_objectList[i]->GetShareFlag()<<"]"<<endl;            return m_objectList[i];        }    }    ConcreteFlyweight* newObj = new ConcreteFlyweight(flag);    m_objectList.push_back(newObj);    return newObj;}int main(int argc, char *argv[]){    FactoryFlyweight* pFactory = NULL;    Flyweight* pFlyweight = NULL;    pFactory = new FactoryFlyweight;    pFlyweight = pFactory->CreateFlyweight("object1");    pFlyweight = pFactory->CreateFlyweight("object2");    pFlyweight = pFactory->CreateFlyweight("object3");    pFlyweight = pFactory->CreateFlyweight("object1");    pFlyweight = pFactory->CreateFlyweight("object3");        DESTROY_POINTER(pFactory);    return 0;}