to_string( original_exception_type const & x ) doesn't add "\n"

[zlojvavan]

unlike generalized version to_string( error_info<Tag,T> const & x )

I have my own custom extension to library that besides other features (such as customizing output for error_info_name according to end user dictionary, optionally choosing what types from error_info_map to include/exclude from generated diagnostic info string etc.) fix this annoyance for me but thought you might want to look into this

[zajo]

It'd be more annoying to have to remove the \n in case it isn't needed.

[zlojvavan]

in it's current implementation it defaces generated diagnostic string to some extent what are those other scenarios when trailing "\n" would annoy?

[zajo]

This looks good to me:

example.cpp(14): Throw in function main
Dynamic exception type: boost::wrapexcept<my_error>
std::exception::what: std::exception
[my_info1_*] = 1
[my_info2_*] = 2

From this source:

#include <boost/exception/all.hpp>
#include <iostream>

typedef boost::error_info<struct my_info1_, int> my_info1;
typedef boost::error_info<struct my_info2_, int> my_info2;

struct my_error: public boost::exception, public std::exception { };

int main()
{
    try
    {
        BOOST_THROW_EXCEPTION(my_error() << my_info1(1) << my_info2(2));
    }
    catch( boost::exception & e )
    {
        std::cout << boost::diagnostic_information(e);
    }
}

[zlojvavan]

use something that involves original_exception_type processing, such as say try { try { BOOST_THROW_EXCEPTION(my_error() << my_info1(1) << my_info2(2)); } catch (...) { boost::rethrow_exception(boost::current_exception()); } } catch (boost::exception& e) { std::cout << boost::diagnostic_information(e); }

[zajo]

Your code outputs this:

example.cpp(15): Throw in function main
Dynamic exception type: boost::wrapexcept<my_error>
std::exception::what: std::exception
[my_info1_*] = 1
[my_info2_*] = 2

What is the problem?

[zlojvavan]

try this: try { auto const e = my_error() << my_info1(1) << my_info2(2); e << boost::original_exception_type(&typeid(e)); BOOST_THROW_EXCEPTION(e); } catch (boost::exception& e) { std::cout << boost::diagnostic_information(e); }

here's output produced for me (not quite accurate, still struggling with markdown):

Dynamic exception type: struct boost::wrapexcept std::exception::what: Unknown exception

*struct my_error[struct myinfo1 __ptr64] = 1**

[struct myinfo2 * __ptr64] = 2