Re: [Boost-users] program_options: St9exception Exception?

From: Ben Hutchings (ben.hutchings_at_[hidden])
Date: 2005-11-21 14:41:01

Merrill Cornish wrote:
<snip>

>}//try
>catch(std::exception e) {
>    cerr << "Exception:" << endl;
>    cerr << e.what() << endl;
>    exit(EXIT_FAILURE);
>}//catch
>catch(...) {
>    cerr << "An unknown exception occurs while parsing :
>                "command line arguments." << endl;
>    exit(EXIT_FAILURE);
>}//catch
>
>
>Using the 'try' in the position shown above, if I input an unexpected command
>line options, an exceptioin is thrown whose what() method returns "St9exception".
>That's it.  Just "St9exception".  I can't find that string in the Boost source anywhere.
>  
>
In libstdc++ the default messages for standard exception classes are 
their "mangled" symbol names, and St9exception is the mangled name for 
std::exception. The reason you're seeing that is that you're catching 
the exception by value, not reference.

Ben.