C++ 异常处理

 1 #include <iostream>
 2 #include <exception>
 3 
 4 using std::cout;
 5 using std::endl;
 6 
 7 class Test{
 8 public:
 9     Test(const std::string msg):_msg(msg) { } 
10     std::string msg() { return _msg; }
11 private:
12     std::string _msg;
13 };
14 
15 int main(){
16     try{
17         try{
18             try{
19                 //throw 4;
20                 //throw "throw err msg";
21                 throw 1.2;
22                 //throw Test("test err");
23             }   
24             catch(int a){   //捕获int类型异常
25                 cout << "catch " << a << endl;  
26             }   
27             catch(const char* msg){ //捕获char*类型
28                 cout << "throw the old err" << endl;
29                 throw ; //将异常原样抛出
30             }   
31             catch(Test &t){ //捕获Test类型异常
32                 cout << "throw " << t.msg() << endl;
33             }   
34         }   
35         catch(const char *msg){
36             cout << "cat " << msg << endl;
37         }   
38     }   
39     catch(...){ //"..."作为兜底可以捕获所有到异常, 一般放在最后一个catch
40         cout << "other err" << endl;
41     }
42 
43     return 0;
44 }