桥接模式

一、桥接模式

• 解耦
  图解

示例代码

#include <iostream>

using namespace std;

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

class Shape
{
public:
    Shape(int x, int y, Line * pl = nullptr) : _x(x), _y(y), _pl(pl) {}
    virtual void drawShape() = 0;

protected:
    int _x;
    int _y;
    Line * _pl;
};

class Circle : public Shape
{
public:
    Circle(int x = 0, int y = 0, int radious = 0, Line * pl = nullptr) : Shape(x, y, pl), _radious(radious) {}

    void drawShape()
    {
         cout << "draw from" << "(" << _x << ", " << _y << ") " << "radious is " << _radious << endl;
         _pl->drawLine();
    }

protected:
    int _radious;

};

class Rect : public Shape
{
public:
    Rect(int x = 0, int y = 0, int len = 0, int wid = 0, Line *pl = nullptr) : Shape(x, y, pl), _len(len), _wid(wid) {}

    void drawShape()
    {
         cout << "draw from" << "(" << _x << ", " << _y << ") " << "len is " << _len <<
                 " wid is " << _wid << endl;
         _pl->drawLine();
    }

protected:
    int _len;
    int _wid;
};


class DotLine : public Line
{
public:
    void drawLine()
    {
        cout << "Dot Line" << endl;
    }
};

class SolidLine : public Line
{
public:
    void drawLine()
    {
        cout << "Solid Line" << endl;
    }
};

int main()
{
    DotLine dl;
    SolidLine sl;

    Circle c(1, 2, 3, &dl);
    c.drawShape();

    Rect r(1, 2, 3, 4, &sl);
    r.drawShape();


    return 0;
}