#include <stdlib.h>#include <iostream>using namespace std;class Product{public:    virtual ~Product() {}    virtual int Interface()=0;};class ConcreteProductA : public Product{public:    ConcreteProductA() {}    virtual ~ConcreteProductA() {}    int Interface()    {        cout<<"Make my ProductA good!"<<endl;        return -1;    }};class ConcreteProductB : public Product{public:    ConcreteProductB() {}    virtual ~ConcreteProductB() {}    int Interface()    {        cout<<"Make my ProductB better!"<<endl;        return 0;    }    };class ConcreteProductC : public Product{public:    ConcreteProductC() {}    virtual ~ConcreteProductC() {}    int Interface()    {        cout<<"Make my ProductC best!"<<endl;        return 1;    }    };#define PRODUCTA 1#define PRODUCTB 2#define PRODUCTC 3class SimpleFactory{public:    static Product* CreateProduct(int iType)    {        switch(iType)        {            case PRODUCTA: return new ConcreteProductA;            case PRODUCTB: return new ConcreteProductB;            case PRODUCTC: return new ConcreteProductC;            default:            {                cerr<<"Sorry, I have not the product you need!"<<endl;                return NULL;            }        }    }};#define CUSTOMER main#define DESTROY(ptr) if (ptr) { delete ptr; ptr = NULL; }int CUSTOMER(int argc, char** argv){    Product* pProduct = NULL;        pProduct = SimpleFactory::CreateProduct(PRODUCTA);    pProduct->Interface();    DESTROY(pProduct);    pProduct = SimpleFactory::CreateProduct(PRODUCTB);    pProduct->Interface();    DESTROY(pProduct);            pProduct = SimpleFactory::CreateProduct(PRODUCTC);    pProduct->Interface();    DESTROY(pProduct);    return EXIT_SUCCESS;}