delegation.cpp

设计模式 几个常见的设计模式源代码 Delegation Factory等

#include <iostream>
using namespace std;

class Rectangle
{
public:
	Rectangle( int height, int width ) : _height( height ), _width( width )
	{
	}

public:
	int Area()
	{
		return _height*_width;
	}
	
private:
	int _height;
	int _width;
};

class Target
{
	virtual int Area() = 0;
};

class Window : public Target
{
public:
	Window( Rectangle& rect ) : _rect( rect )
	{
	}
public:
	int Area()
	{
		return _rect.Area();
	}
	
private:
	Rectangle& _rect;
};

int main()
{
	Rectangle rect( 10, 20 );
	Window win( rect );
	win.area();	
	
	return 0;
}