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Struct template is_dimensionless<quantity< Unit, Y >>

boost::units::is_dimensionless<quantity< Unit, Y >> — check if a quantity is dimensionless


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

template<typename Unit, typename Y> 
struct is_dimensionless<quantity< Unit, Y >> : public boost::units::is_dimensionless< Unit > {