Can't repro on godbolt/gcc: https://godbolt.org/z/rWddT5xce.
I know you're using MSVC but please provide compiler version and Boost version. On Sun, Oct 29, 2023 at 7:29 AM Bernard via Boost-users < boost-users@lists.boost.org> wrote: > greetings kind regards > may i please inquire how not to obtain "std::exception::what: Unknown > exception" from diagnosic_inforumation() . my meaning is to inquire how to > obtain as per example on boost web page > https://www.boost.org/doc/libs/1_83_0/libs/exception/doc/tutorial_diagnostic_information.html > output : "std::exception::what: example_io error" > id est where did "example_io error" come from as neither boost::exception > nor std:::exception accept constructor string arguments . > > please my code below . > thank you kindly > > #include "stl" // #includes all stl #include files > #include "boost\exception\all.hpp" > using namespace std; > > struct ceXception : virtual boost::exception, virtual std::exception > { > using this_type = ceXception; > ceXception() {} > auto what() { cerr << __FUNCSIG__ << endl; return string("return from " + > string(__FUNCSIG__)); } > template<typename charType> > friend > std::basic_ostream<charType>& operator<<(std::basic_ostream<charType>& > _ostream, const this_type&) { cerr << "to cerr from " << __FUNCSIG__ << > endl; _ostream << "to ostream from " << __FUNCSIG__ << endl; return > _ostream; } > }; > > void foo() > { > try { BOOST_THROW_EXCEPTION(ceXception()); } > catch (ceXception& e) > { > cerr << boost::diagnostic_information(e); > } > } > > int main() > { > foo(); > return 0; > } > _______________________________________________ > Boost-users mailing list > Boost-users@lists.boost.org > https://lists.boost.org/mailman/listinfo.cgi/boost-users >
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