c++ - error C2059: syntax error : '<end Parse>' -

this visual c++ code used hardware driver getting follwoing error @ compile time.

template<class _a, class _r> struct unary_function { typedef _a argument_type; typedef _r result_type; }; 

don't use identifiers beginning underscore , capital, reserved implementation. _a or _r defined not make sense when substituted code.

see : what rules using underscore in c++ identifier?