C++中枚举类型++运算符重载

VC中不支持枚举类型的++操作。决定重载一下++运算符！

先由简单开始，重载一个枚举型的日期的例子。

 #include <stdio.h>enum weekday{sun=7,mon=1,tue,wed,thu,fri,sat,};weekday& operator ++(weekday& e);main(){ weekday workday1;workday1=(enum weekday)1; printf("workday1=%d/n",workday1);workday1++;printf("workday1=%d/n",workday1);return 0;}weekday&operator++(weekday &e){int i=e;e=(enum weekday)(i+1);return e;}

然后一个是5个球中选三个的例子。

#include<iostream>using namespace std;enum color_5balls{red,yellow,blue,white,black};color_5balls& operator ++(color_5balls & e);void main(){color_5balls i,mid;color_5balls j;color_5balls k;int n=0,loop ;for(i=red;i<=black;i++)for(j=red;j<=black;j++){if(i!=j)for(k=red;k<=black;k++)if((k!=i)&(k!=j)){n=n+1;printf("%d",n);for(loop=1;loop<=3;loop++){switch(loop){case 1:mid=i;break;case 2:mid=j;break;case 3:mid=k;break;default:break;}switch(mid){case red:printf("%-10s","red");break;case yellow:printf("%-10s","yellow");break;case blue:printf("%-10s","blue");break;case white:printf("%-10s","white");break;case black:printf("%-10s","black");break;default :break;}}printf("/n");}}while(1);}color_5balls&operator++(color_5balls &e){int i=e;e=(enum color_5balls)(i+1);return e;}

 他们两个的方法是一样的。如果要在类中重载的话可能要加friend 关键词。