This has been driving me crazy all night.

```
class ExceptionImpl;

/**
* Custom Exception.
*/
class Exception : public virtual std::exception
{
  public:
    Exception( const Exception& original );

    Exception( const std::string& message );

    virtual ~Exception( void ) throw( );

    virtual const char* what( void ) const throw( );

  private:
    const std::unique_ptr< ExceptionImpl > m_pimpl;
};

```

I throw this custom exception from a library as follows

```
throw Exception( "Error message" );

```

and catch it in main via

```
try
{
   regex pattern(R"(a*)");

   Id::set_pattern_validator(pattern);

   assert(false);
}
catch( Exception const& exception )
{
   assert(true);
}

```

`Id::set_pattern_validator` is a static method within the Id class of the library and the source of the exception. I've tried everything i can to catch the exception but it fails to be caught.

```
catch( Exception )

catch( std::exception )

catch( ... )

Nada!

```

Terminal output is as follows. 

*"Terminate called after throwing an instance of 'Exception' what(): The pattern validator cannot be altered once set. Abort trap."* 

Now short of sacrificing a goat I'm at a loss on what to try next... any hints/tips???

Note: If i throw the custom exception within main i can catch it no problem.

Mac OS X environment using GCC with the C++0x support.

**EDIT: A solution for now is to continue development on a linux based system (Fedora). I will not be accepting an answer as of yet.
Thanks for everyones help.**