设计模式之工厂模式

<span style="font-family: Arial, Helvetica, sans-serif;">class product</span>

{
public:
    virtual void show() = 0;
}

class productA: public product
{
public:
    void show(){ cout << "productA" << std::endl;}
}

class productB : public product
{
public:
    void show(){ cout << "productB" << std::endl;}
}

class Factroy
{
public:
  virtual product* createProduct() = 0;
}

class FactroyA : Factroy
{
public:
  product* createProduct(){ return new productA;}
}

class FactroyB: Factory
{
public:
  product* createProduct(){return new productB;}
}

工厂能够随产品的需要而扩展