C++设计模式之抽象工厂模式

/*
** FileName   : AbstractFactoryPatternDemo
** Author    : Jelly Young
** Date     : 2013/11/19
** Description : More information
*/ 
 
#include <iostream>
using namespace std;
 
// Product A
class ProductA
{
public:
  virtual void Show() = 0;
};
 
class ProductA1 : public ProductA
{
public:
  void Show()
  {
    cout<<"I'm ProductA1"<<endl;
  }
};
 
class ProductA2 : public ProductA
{
public:
  void Show()
  {
    cout<<"I'm ProductA2"<<endl;
  }
};
 
// Product B
class ProductB
{
public:
  virtual void Show() = 0;
};
 
class ProductB1 : public ProductB
{
public:
  void Show()
  {
    cout<<"I'm ProductB1"<<endl;
  }
};
 
class ProductB2 : public ProductB
{
public:
  void Show()
  {
    cout<<"I'm ProductB2"<<endl;
  }
};
 
// Factory
class Factory
{
public:
  virtual ProductA *CreateProductA() = 0;
  virtual ProductB *CreateProductB() = 0;
};
 
class Factory1 : public Factory
{
public:
  ProductA *CreateProductA()
  {
    return new ProductA1();
  }
 
  ProductB *CreateProductB()
  {
    return new ProductB1();
  }
};
 
class Factory2 : public Factory
{
  ProductA *CreateProductA()
  {
    return new ProductA2();
  }
 
  ProductB *CreateProductB()
  {
    return new ProductB2();
  }
};
 
int main(int argc, char *argv[])
{
  Factory *factoryObj1 = new Factory1();
  ProductA *productObjA1 = factoryObj1->CreateProductA();
  ProductB *productObjB1 = factoryObj1->CreateProductB();
 
  productObjA1->Show();
  productObjB1->Show();
 
  Factory *factoryObj2 = new Factory2();
  ProductA *productObjA2 = factoryObj2->CreateProductA();
  ProductB *productObjB2 = factoryObj2->CreateProductB();
 
  productObjA2->Show();
  productObjB2->Show();
 
  if (factoryObj1 != NULL)
  {
    delete factoryObj1;
    factoryObj1 = NULL;
  }
 
  if (productObjA1 != NULL)
  {
    delete productObjA1;
    productObjA1= NULL;
  }
 
  if (productObjB1 != NULL)
  {
    delete productObjB1;
    productObjB1 = NULL;
  }
 
  if (factoryObj2 != NULL)
  {
    delete factoryObj2;
    factoryObj2 = NULL;
  }
 
  if (productObjA2 != NULL)
  {
    delete productObjA2;
    productObjA2 = NULL;
  }
 
  if (productObjB2 != NULL)
  {
    delete productObjB2;
    productObjB2 = NULL;
  }
}