1 const int TYPE_1 = 0;
 2 const int TYPE_2 = 1;
 3 const int TYPE_3 = 2;
 4 
 5 const int ONE = 0;
 6 const int TWO = 1;
 7 
 8 bool func(int type)
 9 {
10     //范围检查
11     if(type < 0 || type > 2) throw type;
12     //执行的代码
13     
14 }

 1 enum EType
 2 {
 3     TYPE_1 = 0,
 4     TYPE_2 = 1,
 5     TYPE_3 = 2
 6 };
 7 
 8 enum ENum
 9 {
10     ONE = 0,
11     TWO = 1
12 };
13 
14 bool func(EType type)
15 {
16     //执行的代码
17     
18 }

1 enum EType
2 {
3     TYPE_1 = 0,
4     TYPE_2 = 0,
5     TYPE_3 = 0
6 };