c++11(2)-枚举类enum class

enum class Enumeration{ Val1, Val2, Val3 = 100, Val4 /* = 101 */,};

此种枚举为类型安全的。枚举类型不能隐式地转换为整数；也无法与整数数值做比较。

#include <iostream>
using namespace  std ;
int main(int argc, char **argv)
{

    enum class Status {RUN,ERROR,FINISHED,START,STOP};
    Status proStatus1 {Status::START};
    Status ProStatus2{Status::ERROR};
    Status nowStatus;
    nowStatus=Status::STOP;
    for (int i=0;i<2;i++){
        if (nowStatus==Status::STOP){
            nowStatus=Status::START;
        }    
        else if(nowStatus==Status::START){
            nowStatus=Status::RUN;
        }        
    }
    cout<<(long)nowStatus;

    
	return 0;
}

输出 0

#include <iostream>
using namespace  std ;
int main(int argc, char **argv)
{

    enum class Status {RUN=10,ERROR,FINISHED,START,STOP};
    Status proStatus1 {Status::START};
    Status ProStatus2{Status::ERROR};
    Status nowStatus;
    nowStatus=Status::STOP;
    for (int i=0;i<3;i++){
        if (nowStatus==Status::STOP){
            nowStatus=Status::START;
        }    
        else if(nowStatus==Status::START){
            nowStatus=Status::RUN;
        }     
        else if(nowStatus==Status::RUN){
            nowStatus=Status::FINISHED;
        }        
    }
    cout<<(long)nowStatus;

    
	return 0;
}

输出12

#include <iostream>
using namespace  std ;
int main(int argc, char **argv)
{
    
    enum class Status:long {RUN=10,ERROR,FINISHED,START,STOP};
    Status proStatus1 {Status::START};
    Status ProStatus2{Status::ERROR};
    Status nowStatus;
    nowStatus=Status::STOP;
    for (int i=0;i<3;i++){
        if (nowStatus==Status::STOP){
            nowStatus=Status::START;
        }    
        else if(nowStatus==Status::START){
            nowStatus=Status::RUN;
        }     
        else if(nowStatus==Status::RUN){
            nowStatus=Status::FINISHED;
        }        
    }
    cout<<(long)nowStatus<<endl;
    cout<<static_cast<long>(nowStatus)<<endl;

	return 0;
}

输出12

来源：CSDN

作者：AI_LX

链接：https://blog.csdn.net/AI_LX/article/details/104135749