When Alisdair asked me to comment on the nested_exception paper, I suggested that it needs to be folded into std::exception, providing std::exception_ptr std::exception::context() const; that returns the value of std::current_exception() at construction time. This was (unfairly - IMHO) rejected for ABI reasons. With that in mind, Emil Dotchevski:
What's wrong with
struct whatever { }; struct translated: boost::exception, std::exception { };
typedef boost::error_info<struct tag_nested_exception,boost::exception_ptr> nested_exception;
.... catch( whatever & e ) { throw translated() << nested_exception(boost::copy_exception(e));
I'd say that this needs to be: throw translated() << context( boost::current_exception() ); or, actually: BOOST_THROW_WITH_CONTEXT( translated() );
}
Under C++03 we need to be careful to not call current_exception() when an exception isn't active, so we can't just automatically fold this into the boost::exception constructor or the existing macro. -- Peter Dimov http://www.pdplayer.com