Dimensional Analysis in C++ by Template

template <int m, // exponent for mass
		  int d, // exponent for distance
		  int t> // exponent for time
class Units
{
    
    
public:
	explicit Units(double initVal = 0) : val(initVal) {
    
    }
	double value() const {
    
     return val; }
	double &value() {
    
     return val; }

private:
	double val;
};

void test_dimension()
{
    
    
	Units<1, 0, 0> m; // m is of type mass
	Units<0, 1, 0> d; // d is of type distance
	Units<0, 0, 1> t; // t is of type time
	cout << sizeof(m) << endl;
}