Re: [Boost-users] exception error_info list?

On Fri, Oct 9, 2009 at 5:48 PM, denis wrote:

what do you think about exposing the error_info-map of boost::exception?

I would like to get all attached error infos from one exception.

I've never been able to do anything generic with the error_infos, other than dumping (user-unfriendly) diagnostic information, which is what boost::diagnostic_information is for.

Then, everyone could implement his own version of diagnostic_information() without relying on boost internals.

You do have some control over the output of diagnostic_information: you can provide to_string overloads which Boost Exception will bind through ADL at the time the error_info template is instantiated (see http://www.boost.org/doc/libs/release/libs/exception/doc/diagnostic_informat....) You can either overload to_string for boost::error_info or just for T; the former lets you convert the same T differently depending on Tag, while the latter lets you convert any T regardless of Tag. For an example, see how errinfo_errno implements to_string in terms of strerror in http://svn.boost.org/svn/boost/trunk/boost/exception/errinfo_errno.hpp.

Beside that, I had another idea: When translating an exception it would be possible to copy all error_infos from the originating exception to the new one.  How do you handle this loss of information at the time?

A copy of a boost::exception shares error_info ownership with the original. Does this work for your use case? Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode