设计模式--装饰模式（C++实现）

#include
#include
// abstract Class
class shape
{
public:
	shape() {}
	virtual ~shape() {}
	virtual void decorateMethod() = 0;
};

//Concrate Class
class circle :public shape
{
public:
	circle(std::string iName):shape(),sName(iName){}
	virtual ~circle() {}
	virtual void decorateMethod()
	{
		std::cout << sName <<" decorateMethod" << std::endl;
	}

private:
	std::string sName;
};

//Concrate Class
class square:public shape
{
public:
	square(std::string iName):shape(), sName(iName){}
	virtual ~square(){}
	virtual void decorateMethod()
	{
		std::cout << sName << " decorateMethod" << std::endl;
	}
private:
	std::string sName;
};

//Decorate Class
class DecorateShape :public shape
{
public:
	DecorateShape(shape* iShape):pShape(iShape){}
	virtual ~DecorateShape(){}
	virtual void decorateMethod()
	{
		pShape->decorateMethod();
	}
private:
	shape *pShape;
};

//Concrate decorate class
class decorateShapeA :public DecorateShape
{
public:
	decorateShapeA(shape* iShape) :DecorateShape(iShape) {}
	virtual ~decorateShapeA() = default;
	virtual void decorateMethod()
	{
		DecorateShape::decorateMethod();
		AddDecorateColor();
	}
private:
	void AddDecorateColor()
	{
		std::cout << " Add Color" << std::endl;
	}
};

class decorateShapeB :public DecorateShape
{
public:
	decorateShapeB(shape* iShape):DecorateShape(iShape){}
	virtual ~decorateShapeB() = default;
	virtual void decorateMethod()
	{
		DecorateShape::decorateMethod();
		AddDecorateSize();
	}
private:
	void AddDecorateSize()
	{
		std::cout << " Change Size" << std::endl;
	}
};

int main()
{
	shape *pCircle = new circle("Circle");
	pCircle->decorateMethod();
	shape *pA = new decorateShapeA(pCircle);
	pA->decorateMethod();
	shape *pB = new decorateShapeB(pCircle);
	pB->decorateMethod();
	shape *pAB = new decorateShapeB(pA);
	pAB->decorateMethod();

	if (pCircle)
	{
		delete pCircle;
		pCircle = nullptr;
	}
	if (pA)
	{
		delete pA;
		pA = nullptr;
	}
	if (pB)
	{
		delete pB;
		pB = nullptr;
	}
	if (pAB)
	{
		delete pAB;
		pAB = nullptr;
	}
	system("pause");
	return 0;
}