 )            : base_type(system::error_code(ev, system::system_category()), "Condition error")            {            }            condition_error( int ev, const char * what_arg )            : base_type(system::error_code(ev, system::system_category()), what_arg)            {            }            condition_error( int ev, const std::string & what_arg )            : base_type(system::error_code(ev, system::system_category()), what_arg)            {            }      