How can I determine the current exception in a catch (...) block? [duplicate]

Question

Possible Duplicate:
Determining exception type after the exception is caught?

Following up on this question , I'd like to print out the current exception in a catch(...) block -- just for logging. One answer there says that there is no standard way of doing this, but I don't like taking no for an answer :-)

current_exception() is a function mentioned in various places on the web but apparently not well-supported. Any thoughts on this? After all, even C has errno.

Because it can be rethrown (with a simple **throw*), the exception object must be available somehow.

I am using MSVS 9.0.

Edit: The conclusion seems to be that this is not possible.

Answer 1

If you only care about exceptions that you know about when you're writing the code then you can write a handler that can deal with all 'known' exceptions. The trick is to rethrow the exception that you caught with catch(...) and then catch the various known exceptions...

So, something like:

try
{
 ...
}
catch(...)
{
   if (!LogKnownException())
   {
      cerr << "unknown exception" << endl;
   }
}

where LogKnownException() looks something like this:

bool LogKnownException()
{
   try
   {
      throw;
   }
   catch (const CMyException1 &e)
   {
      cerr << "caught a CMyException: " << e << endl;

      return true;
   }
   catch (const Blah &e)
   {
      ...
   }
   ... etc

   return false;
}