c++ - 异常处理 - set_unexpected() 无法调用

Question

#include "iostream"
#include "conio.h"
#include "exception"
#include "cstdlib"
using namespace std;

void myunexpected () 
{
    cerr << "unexpected called\n";
    throw 0;     // throws int (in exception-specification)
}

void myfunction () throw (int) 
{
    throw 'x';   // throws char (not in exception-specification)
}

int main (void) 
{
    set_unexpected (myunexpected);
   try 
   {
      myfunction();
   }
   catch (int) { cerr << "caught int\n"; }
   catch (...) { cerr << "caught other exception (non-compliant compiler?)\n"; }
   getch();
   return 0;
}

Output(When executed on Visual studio 2008): caught other exception (non-compliant compiler?)

But, I was expecting the output to be:

unexpected called

caught int

NOTE: I executed this program on Visual Studio 2008.

Answer 1

是的，根据标准，输出应为^[#1]:

unexpected called
caught int

gcc 给出 accurate result 。

请注意，MSVC 在处理异常规范方面是出了名的错误。异常规范被视为failed experiment 。
AFAIK，MSVC 不实现异常规范，除了空规范(throw()/nothrow)

C++03 标准:

[#1] 15.5.2 unexpected() 函数 [ except.unexpected]

The unexpected() function shall not return, but it can throw (or re-throw) an exception. If it throws a new exception which is allowed by the exception specification which previously was violated, then the search for another handler will continue at the call of the function whose exception specification was violated....