Bridge 模式C++实现

最新推荐文章于 2024-11-27 10:42:47 发布

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最新推荐文章于 2024-11-27 10:42:47 发布

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文章标签： c++ class delete list null

本文链接：https://blog.youkuaiyun.com/clw1984/article/details/4565870

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本文通过C++代码示例介绍了如何使用抽象基类和多态特性来实现不同版本的绘图功能。具体包括定义了一个抽象基类Drawing，以及两个派生类V1Drawing和V2Drawing来实现具体的绘图操作。Shape类作为另一个抽象基类，其派生类Rectangle和Circle分别实现了绘制矩形和圆形的功能。通过此设计，展示了如何利用面向对象编程原则实现模块间的解耦。

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class Drawing
{
public:
virtual void drawLine() = 0;
virtual void drawCircle() = 0;
};

class V1Drawing:public Drawing
{
public:
virtual void drawLine()
{
cout<<"V1 draw line"<<endl;
}
virtual void drawCircle()
{
cout<<"V1 draw circle"<<endl;
}
};

class V2Drawing:public Drawing
{
public:
virtual void drawLine()
{
cout<<"V2 draw line"<<endl;
}
virtual void drawCircle()
{
cout<<"V2 draw circle"<<endl;
}
};

class shape
{
public:
shape(){}
shape(Drawing* pDrawing)
{
  m_pdrawing = pDrawing;
}
~shape()
{
  delete m_pdrawing;
  m_pdrawing = NULL;
}
virtual void draw()=0;
void drawLine()
{
  m_pdrawing->drawLine();
}
void drawCircle()
{
  m_pdrawing->drawCircle();
}
private:
Drawing* m_pdrawing;
};

class Rectangle:public shape
{
public:
Rectangle(Drawing* pDrawing):shape(pDrawing){}
~Rectangle(){}
virtual void draw()
{
drawLine();
}
};

class Circle:public shape
{
public:
Circle(Drawing* pDrawing):shape(pDrawing){}
~Circle(){}
virtual void draw()
{
drawCircle();
}
};

int _tmain(int argc, _TCHAR* argv[])
{
LIST_HEAD(new_list);
INIT_LIST_HEAD(&new_list);

Drawing* pDrawing = new V1Drawing();
shape* pshape = new Circle(pDrawing);
pshape->draw();
delete pshape;
pshape = NULL;
pDrawing = NULL;
pDrawing = new V2Drawing();
pshape = new Rectangle(pDrawing);
pshape->draw();
delete pshape;
return 0;
}