标签:Area float virtual 工厂 抽象 模式 Circle include Rectangle
1.简单工厂模式
利用多态来实现简单工厂模式(继承,纯虚函数)
下方例子展示不同面积的计算
1.1.父类(仅实现头文件即可,用纯虚函数,析构函数设置为虚函数)
#ifndef AREA_H
#define AREA_H
#include <iostream>
using namespace std;
class Area
{
public:
virtual void showArea() = 0;
virtual float calcuArea() = 0;
virtual ~Area() {}
};
#endif // !AREA_H
1.2实际产品(此处以圆和矩形作为例子)
1.2.1圆
#ifndef CIRCLE_H
#define CIRCLE_H
#include "area.h"
class Circle :public Area
{
public:
Circle(float radius);
virtual void showArea();
virtual float calcuArea();
virtual ~Circle() {}
private:
float _Cradius;
};
#endif // !CIRCLE_H
#include "circle.h"
Circle::Circle(float radius)
:_Cradius(radius)
{
}
void Circle::showArea()
{
cout << "Circle: ";
}
float Circle::calcuArea()
{
return 3.14*_Cradius*_Cradius;
}
1.2.2矩形
#ifndef RECTANGLE_H
#define RECTANGLE_H
#include "area.h"
class Rectangle :public Area
{
public:
Rectangle(float length, float width);
virtual void showArea();
virtual float calcuArea();
virtual ~Rectangle() {}
private:
float _Rlegth;
float _Rwidth;
};
#endif
#include "rectangle.h"
Rectangle::Rectangle(float length, float width)
:_Rlegth(length), _Rwidth(width)
{
}
void Rectangle::showArea()
{
cout << "Rectangle: ";
}
float Rectangle::calcuArea()
{
return _Rlegth * _Rwidth;
}
1.3工厂
#ifndef AREAFACTORY_H
#define AREAFACTORY_H
#include "circle.h"
#include "rectangle.h"
enum AREA_TYPE
{
CIRCLE = 0,
RECTANGLE
};
class Areafactory
{
public:
Area* calcuDiffArea(AREA_TYPE type);
};
#endif // !AREAFACTORY_H
#include "areaFactory.h"
Area* Areafactory::calcuDiffArea(AREA_TYPE type)
{
switch (type)
{
case CIRCLE:
return new Circle(10);
break;
case RECTANGLE:
return new Rectangle(4, 5);
break;
default:
break;
}
}
1.4主函数
#include "areaFactory.h"
int main()
{
Areafactory *pAreaFactory = new Areafactory();
Area *pCircleArea = pAreaFactory->calcuDiffArea(CIRCLE);
if (nullptr == pCircleArea) {
return 0;
}
pCircleArea->showArea();
cout << pCircleArea->calcuArea();
delete pCircleArea;
pCircleArea = nullptr;
cout << endl;
Area *pRectangleArea = pAreaFactory->calcuDiffArea(RECTANGLE);
pRectangleArea->showArea();
cout<<pRectangleArea->calcuArea();
delete pRectangleArea;
pRectangleArea = nullptr;
delete pAreaFactory;
pAreaFactory = nullptr;
return 0;
}
2.抽象工厂模式
标签:Area,float,virtual,工厂,抽象,模式,Circle,include,Rectangle 来源: https://blog.csdn.net/hfwyydy/article/details/122531174
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