Emil Dotchevski wrote:
Alternatively, you could use exception_ptr to store store the whole "low level" exception (error_infos and all) as an error_info:
struct exception_base: virtual boost::exception, virtual std::exception { }; struct lib_exception: exception_base { }; struct app_exception: exception_base { }; typedef boost::error_info<struct nested_exception_,boost::exception_ptr> nested_exception;
try { .... } catch( lib_exception & e ) { throw app_exception() << nested_exception(boost::current_exception()); }
(By the way, diagnostic_information will recurse into nested exceptions and print the nested error_infos as well.)
thank you for all the hints. Storing the original exception was my biggest concern. This feature of nested exceptions is very cool. It gets a little bit lost in the documentation. I'd vote for providing that typedef as a standard "boost::errinfo_...". I attached a small change for diagnostic_information. Unfortunately, I noticed that __cxa_demangle segfaults in certain circumstances (at least on debian and ubuntu). Please forget that function. regards, Denis ------------------------------------------------------------ --- diagnostic_information.hpp.org 2009-05-17 08:12:29.000000000 +0200 +++ diagnostic_information.hpp 2009-10-12 22:04:06.000000000 +0200 @@ -79,14 +79,11 @@ { tmp << *f; if( int const * l=get_error_info<throw_line>(*be) ) - tmp << '(' << *l << "): "; + tmp << '(' << *l << ')'; + tmp << ": "; } - tmp << "Throw in function "; if( char const * const * fn=get_error_info<throw_function>(*be) ) - tmp << *fn; - else - tmp << "(unknown)"; - tmp << '\n'; + tmp << "Throw in function " << *fn << '\n'; } #ifndef BOOST_NO_RTTI tmp << std::string("Dynamic exception type: ") <<