...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
#include <boost/exception_ptr.hpp>
namespace
boost
{
typedef error_info<struct tag_original_exception_type,std::type_info const *> original_exception_type;
}
This error_info typedef is used by current_exception if it defaults to returning an exception_ptr that refers to an object of type unknown_exception, to record in it the std::type_info of the original exception object.