7

I know that you can catch "all exceptions" and print the exception by 

try
{
    //some code...
}catch(const std::exception& e) {
   cout << e.what();
}

but this is just for exceptions derived from std::exception. I was wondering if there is a way to get some information from an ellipsis catch

try
{
    //some code...
}catch(...) {
   // ??
}

If the mechanism is the same as ellipsis for functions then I should be able to do something like casting the argument of the va_list and trying to call the what() method.

I haven't tried it yet but if someone knows the way I'd be excited to know how.

ZivS
  • 2,094
  • 2
  • 27
  • 48

2 Answers2

9

From C++11 and onwards, you can use std::current_exception &c:

std::exception_ptr p;
try {
    
} catch(...) {
    p = std::current_exception();
}

You can then "inspect" p by taking casts &c, albeit not in a portable way.

In earlier standards there is no portable way of intersecting the exception at a catch(...) site, other than re-throwing it with throw;.

Bathsheba
  • 231,907
  • 34
  • 361
  • 483
6

Sorry, you can't do that. You can only access the exception object in a catch block for a specific exception type.

Mike Seymour
  • 249,747
  • 28
  • 448
  • 644