// In header: <boost/units/scaled_base_unit.hpp>

template<typename S, typename Scale> 
struct scaled_base_unit {
  // types
  typedef scaled_base_unit     type;          
  typedef scaled_base_unit_tag tag;           
  typedef S                    system_type;   
  typedef Scale                scale_type;    
  typedef S::dimension_type    dimension_type;
  typedef unspecified          unit_type;     

  // public static functions
  static std::string symbol();
  static std::string name();
};