简单工厂模式（大话设计模式C++实现）

旧城等待， 2022-09-10 12:21 154阅读 0赞

简单工厂模式（大话设计模式C++实现）

# 类图 #

![简单工厂模式设计类图][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAemhhbmdodWFpY2hhbw_size_20_color_FFFFFF_t_70_g_se_x_16_pic_center]

# 代码如下 #

\#include  
\#include  
using namespace std;

class Operation\{  
public:  
virtual double getResult()=0;  
void SetNumberA(double value)\{  
NumberA = value;  
\}  
double GetNumberA()\{  
return NumberA;  
\}  
void SetNumberB(double value)\{  
NumberB = value;  
\}  
double GetNumberB()\{  
return NumberB;  
\}  
protected:  
double NumberA;  
double NumberB;  
\};

class addOperation:public Operation\{  
public:  
double getResult()\{  
return NumberA+NumberB;  
\}  
\};

class subOperation:public Operation\{  
public:  
double getResult()\{  
return NumberA-NumberB;  
\}  
\};  
class mulOperation:public Operation\{  
public:  
double getResult()\{  
return NumberA\*NumberB;  
\}  
\};

class divOperation:public Operation\{  
public:  
double getResult()\{  
return NumberA/NumberB;  
\}  
\};

class simpleFatory\{  
public:  
Operation\* createOperation(string type)\{  
if(type=="+")\{  
return new addOperation;  
\}  
else if(type=="-")\{  
return new subOperation;  
\}  
else if(type=="\*")\{  
return new mulOperation;  
\}  
else if(type=="/")\{  
return new divOperation;  
\}  
return NULL;

}

\};  
int main()\{

simpleFatory* factory=new simpleFatory;
    Operation* operation=factory->createOperation("+");
    if(operation==NULL){
        return -1;
    }
    operation->SetNumberA(16);
    operation->SetNumberB(8);
    std::cout<<operation->getResult()<<std::endl;

[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAemhhbmdodWFpY2hhbw_size_20_color_FFFFFF_t_70_g_se_x_16_pic_center]: /images/20220829/f3c1d8d41dc0412c9c24cf5884dee928.png