关于例外的问题 [英] Question about Exceptions

问题描述

我只是在视觉工作室里玩异常，并且使用上面的代码，我期望，因为我的异常规范没有提到任何bad_exception应该被抛出。但实际发生的是异常被适当的处理程序所捕获。为什么这样？我在IDE中缺少一些设置或某些东西？

I was just playing around with exceptions in the visual studio and with the above code I was expecting that since my exception specification doesn't mention anything the bad_exception should have been thrown. But what actually happens is the exception gets caught by the appropriate handler. Why so? Am i missing some setting or something in the IDE?

虽然我被困在上面提到的，实际上我试图找到问题的答案，如果我有一个例外空白规范然后什么叫？
将会抛出 意外（） 方法或 * bad_exception * ，如果两者都按照什么顺序？
这是代码。

While i got stuck at above mentioned, Actually I was trying to find answer to the question,If i have a exception blank specification then what gets called? the unexpected() method or a *bad_exception* will be thrown and if both in what order? Here's the code.

 #include "stdafx.h"  
 #include <stdio.h>  
 #include <exception>  
 #include <iostream>  


using namespace std;

class A
{
    public:
        int i;
};

void myunexpected () 
{
    cerr << "unexpected called\n";
}

void doSomething(void) throw();
void doSomething(void) throw()
{
    A obj;
    obj.i= 100;
    throw obj;
}


int _tmain(int argc, _TCHAR* argv[])
{
    set_unexpected (myunexpected);
    try 
    {
        doSomething();
    }
    catch (bad_exception be) 
    {
        puts("Caught something");
    }
    catch (A &obj) 
    {
        puts("Caught Integer");
    }
    return 0;
}

推荐答案

关于异常规范，Visual Studio不符合标准。

Regarding exception specification, Visual Studio is not standard-conforming.

虽然空的异常规范有些有用（但是如上所述，VS没有正确实现），一般来说，异常规范被视为失败的实验。

While the empty exception specification is somewhat useful (but, as said, not properly implemented by VS), in general exception specifications are seen as an experiment that failed.

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