Handling errors

Throws an 'system_error' version.
Set 'error_code' on error version.

All class methods of Boost.Application that can generate an error has two version, one throws an exception of type boost::system::system_error, and another receive a boost::system::error_code variable 'ec' that would be set to the result of the operation, and no thrown an exception.

Throws an 'system_error' version.

// ...
int main(int argc, char *argv[])
{
   try
   {
      myapp app;
      application::context app_context;

      return application::launch<application::common>(app, app_context);
   }
   catch(boost::system::system_error& se)
   {
      // error
      std::cerr << se.what() << std::endl;

      return 1;
   }
}

Set 'error_code' on error version.

// ...
int main(int argc, char *argv[])
{
   myapp app;
   application::context app_context;

   boost::system::error_code ec;
   int result = application::launch<application::common>(app, app_context, ec);

   if(ec)
   {
      std::cerr << "[E] " << ec.message()
         << " <" << ec.value() << "> " << std::cout;
   }

   return result;
}