Struct template is_dimensionless

Struct template is_dimensionless_unit

boost::units::is_dimensionless_unit — Check that a type is a dimensionless unit.

Synopsis

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

template<typename T> 
struct is_dimensionless_unit :
  public boost::units::is_unit_of_dimension< T, dimensionless_type >
{
};