设计模式——抽象工厂模式（Abstract Factory）

• 为一组相互关联的对象创建工厂接口（工厂方法模式是为一类对象）

• 

• 代码示例：

  #include <iostream>
  #include <string>
  using namespace std;
  
  //shape
  class Shape 
  {
  public:
      virtual void draw() = 0;
      virtual ~Shape() {}
  };
  
  class Circle : public Shape 
  {
  public:
      void draw() { cout << "Circle::draw" << endl; }
      ~Circle() { cout << "Circle::~Circle" << endl; }
  };
  
  class Square : public Shape 
  {
  public:
      void draw() { cout << "Square::draw" << endl; }
      ~Square() { cout << "Square::~Square" << endl; }
  };
  
  //color
  class Color 
  {
  public:
      virtual void show() = 0;
      virtual ~Color() {}
  };
  
  class Red : public Color 
  {
  public:
      void show() { cout << "Red::show" << endl; }
      ~Red() { cout << "Red::~Red" << endl; }
  };
  
  class Blue : public Color 
  {
  public:
      void show() { cout << "Blue::show" << endl; }
      ~Blue() { cout << "Blue::~Blue" << endl; }
  };
  
  //factory
  class AbstractFactory
  {
  public:
      virtual Shape* CreateShape() = 0;
      virtual Color* CreateColor() = 0;
  };
  
  class ConcreteFactory1 : public AbstractFactory
  {
  public:
      Shape* CreateShape(){return new Circle;}
      Color* CreateColor(){return new Red;}
  };
  
  class ConcreteFactory2 : public AbstractFactory
  {
  public:
      Shape* CreateShape(){return new Square;}
      Color* CreateColor(){return new Blue;}
  };
  
  int main() 
  {
      AbstractFactory *pFactory = new ConcreteFactory1;//ConcreteFactory2;
  
      Shape* pShape = pFactory->CreateShape();
      Color* pColor = pFactory->CreateColor();
  
      pShape->draw();
      pColor->show();
  
      delete pShape;
      delete pColor;
      delete pFactory;
  
      return 0;
  }