抽象工厂

• 抽象工厂创建
• 智能指针管理工厂

抽象工厂模式(Abstract Factory Pattern)：提供一个创建一系列相关或相互依赖对象的接口，而无须指定它们具体的类。抽象工厂模式又称为Kit模式，它是一种对象创建型模式。

抽象工厂创建

class Shape //接口
{
public:Shape() {cout << "Shape" << endl;}virtual ~Shape(){cout << "~Shape" << endl;}virtual void draw() = 0;virtual void erase() = 0;
};class Circle :public Shape
{
public:Circle(){cout << "Circle" << endl;}virtual ~Circle(){cout << "~Circle" << endl;}void draw(){cout << "circle::drap" << endl;}void erase(){cout << "circle::erase" << endl;}
};class Square :public Shape
{
public:Square(){cout << "Square" << endl;}virtual ~Square(){cout << "~Square" << endl;}void draw(){cout << "square::drap" << endl;}void erase(){cout << "square::erase" << endl;}
};class ShapeFactory
{
public:ShapeFactory(){cout << "ShapeFactory" << endl;}virtual ~ShapeFactory(){cout << "~ShapeFactory" << endl;}virtual Shape* create() = 0;
public:static std::map<string, ShapeFactory*> factories;//              key         value//		        ShapeNamestatic Shape* createShape(const string& id){if (factories.find(id) != factories.end()){return factories[id]->create();}else{return nullptr;}}};
std::map<string, ShapeFactory*> ShapeFactory::factories;class CircleFactory :public ShapeFactory
{
public:CircleFactory(){cout << "CircleFactory" << endl;}~CircleFactory(){cout << "~CircleFactory" << endl;}virtual Shape* create(){return new Circle();}
};class SquareFactory :public ShapeFactory
{
public:SquareFactory(){cout << "SquareFactory" << endl;}~SquareFactory(){cout << "~SquareFactory" << endl;}virtual Shape* create(){return new Square();}
};class ShapeFactoryInitializer
{
public:static ShapeFactoryInitializer si;ShapeFactoryInitializer(){ShapeFactory::factories["Circle"] = new CircleFactory();ShapeFactory::factories["Square"] = new SquareFactory();}
};
//静态成员初始化
ShapeFactoryInitializer ShapeFactoryInitializer::si;int main()
{Shape* shape = ShapeFactory::createShape("Circle");//创建类型shape->draw();shape->erase();shape = ShapeFactory::createShape("Square");shape->draw();shape->erase();return 0;
}

智能指针管理工厂

class Shape //接口
{
public:Shape() {cout << "Shape" << endl;}virtual ~Shape(){cout << "~Shape" << endl;}virtual void draw() = 0;virtual void erase() = 0;
};class Circle :public Shape
{
public:Circle(){cout << "Circle" << endl;}virtual ~Circle(){cout << "~Circle" << endl;}void draw(){cout << "circle::drap" << endl;}void erase(){cout << "circle::erase" << endl;}
};class Square :public Shape
{
public:Square(){cout << "Square" << endl;}virtual ~Square(){cout << "~Square" << endl;}void draw(){cout << "square::drap" << endl;}void erase(){cout << "square::erase" << endl;}
};class ShapeFactory
{
public:ShapeFactory(){cout << "ShapeFactory" << endl;}virtual ~ShapeFactory(){cout << "~ShapeFactory" << endl;}virtual std::shared_ptr<Shape> create() = 0;
public:static std::map<string, std::shared_ptr<ShapeFactory>> factories;//              key         value//		        ShapeNamestatic std::shared_ptr<Shape> createShape(const string& id){if (factories.find(id) != factories.end()){return factories[id]->create();}else{return nullptr;}}};
std::map<string, std::shared_ptr<ShapeFactory>> ShapeFactory::factories;class CircleFactory :public ShapeFactory
{
public:CircleFactory(){cout << "CircleFactory" << endl;}~CircleFactory(){cout << "~CircleFactory" << endl;}virtual std::shared_ptr<Shape> create(){return std::make_shared<Circle>();}
};class SquareFactory :public ShapeFactory
{
public:SquareFactory(){cout << "SquareFactory" << endl;}~SquareFactory(){cout << "~SquareFactory" << endl;}virtual std::shared_ptr<Shape> create(){return std::make_shared<Square>();}
};class ShapeFactoryInitializer
{
public:static ShapeFactoryInitializer si;ShapeFactoryInitializer(){ShapeFactory::factories["Circle"] = std::make_shared<CircleFactory>();ShapeFactory::factories["Square"] = std::make_shared<SquareFactory>();}
};
//静态成员初始化
ShapeFactoryInitializer ShapeFactoryInitializer::si;int main()
{std::shared_ptr<Shape> shape = ShapeFactory::createShape("Circle");//创建类型shape->draw();shape->erase();shape = ShapeFactory::createShape("Square");shape->draw();shape->erase();return 0;
}

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