Boost Exception

#include <string>

namespace
boost
    {
    class exception;

    template <class E>
    std::string diagnostic_information( E const & e );
    
    std::string diagnostic_information( exception_ptr const & p );    
    
    char const * diagnostic_information_what( boost::exception const & e ) throw();    
    
    std::string current_exception_diagnostic_information();
    }