...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/diagnostic_information.hpp>
namespace
boost
{
std::string diagnostic_information( boost::exception const & x );
}
This function iterates over all data objects stored in the boost::exception through operator<<. The returned string is constructed by converting each data object to string and then concatenating these strings together.
When the error_info<Tag,T> template is instantiated, the system attempts overload resolution for an unqualified call to to_string(x), where x is of type T. If this is successful, the to_string overload is expected to return std::string and is used to convert objects of type T to string.
Otherwise, the system attempts overload resolution for s << x, where s is a std::ostringstream and x is of type T. If this is successful, the operator<< overload is used to convert objects of type T to string.
Otherwise the system is unable to convert objects of type T to string, and an unspecified stub string value is used without issuing a compile error.