在catch块中重新抛出异常 [英] Re-throw an exception inside catch block

问题描述

任何人都可以确认此信息是否正确：

Can anyone please confirm me if this information is correct or not:

在C ++中，在catch块中，我们可以使用throw语句重新抛出异常，抛出的异常应该与当前捕获的异常类型相同。

In C++, inside catch block we can re-throw an exception using throw statement, but the thrown exception should have the same type as the current caught one.

推荐答案

rethrown异常可以有不同的类型。
在VS2012上编译并正确运行

The rethrown exception can have a different type. This compiles and runs correctly on VS2012

// exceptions
#include <iostream>
using namespace std;

int main () {
try{
      try
      {
        throw 20;
      }
      catch (int e)
      {
        cout << "An exception occurred. Exception Nr. " << e << '\n';
        throw string("abc");
      }
    }
    catch (string ex)
    {
        cout<<"Rethrow different type (string): "<< ex<<endl;
    }
  return 0;
}

输出：

发生异常。异常Nr。 20

An exception occurred. Exception Nr. 20

Rethrow不同类型（字符串）：abc

Rethrow different type (string): abc

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