设计模式--外观模式（c++实现）

/********FacedDP Test**********/
#include<iostream>

//Abstract Interface
class shape
{
public:
	shape() = default;
	virtual ~shape() = default;
	virtual void Draw() = 0;//the Interface Method
};

//Concrete Class
class Circle :public shape
{
public:
	Circle() = default;
	virtual ~Circle() = default;
	void Draw()
	{
		std::cout << "Draw Circle" << std::endl;
	}
};

//Concrete Class
class square :public shape
{
public:
	square() = default;
	virtual ~square() = default;
	virtual void Draw()
	{
		std::cout << "Draw Square" << std::endl;
	}
};

//Faced Class
class shapeMaker
{
public:
	shapeMaker();
	virtual ~shapeMaker();
	void drawCircle();
	void drawSquare();
private:
	shape *pCircle;
	shape *pSquare;
};

shapeMaker::shapeMaker()
{
	pCircle = new Circle();
	pSquare = new square();
}

shapeMaker::~shapeMaker()
{
	if (pCircle)
	{
		delete pCircle;
		pCircle = nullptr;
	}
	if (pSquare)
	{
		delete pSquare;
		pSquare = nullptr;
	}
}

void shapeMaker::drawCircle()
{
	if (pCircle) pCircle->Draw();
}

void shapeMaker::drawSquare()
{
	if (pSquare) pSquare->Draw();
}

int main()
{
	shapeMaker *pShapeMaker = new shapeMaker();
	pShapeMaker->drawCircle();
	pShapeMaker->drawSquare();
	if (pShapeMaker)
	{
		delete pShapeMaker;
		pShapeMaker = nullptr;
	}
	system("pause");
	return 0;
}