/**
* Evaluates a rational function (i.e., the ratio of two polynomials described by the coefficients stored in \\(P\\) and \\(Q\\)).
*
* ## Notes
*
* -   Coefficients should be sorted in ascending degree.
* -   The implementation uses [Horner's rule][horners-method] for efficient computation.
*
* [horners-method]: https://en.wikipedia.org/wiki/Horner%27s_method
*
* @param x    value at which to evaluate the rational function
* @return     evaluated rational function
*/
static {{dtype}} {{fname}}( const {{dtype}} x ) {
	{{dtype}} ax;
	{{dtype}} ix;
	{{dtype}} s1;
	{{dtype}} s2;
	if ( x == 0.0{{dtype_suffix}} ) {
		return {{ratio}};
	}
	if ( x < 0.0{{dtype_suffix}} ) {
		ax = -x;
	} else {
		ax = x;
	}
	if ( ax <= 1.0{{dtype_suffix}} ) {
		s1 = {{P_ASCENDING}};
		s2 = {{Q_ASCENDING}};
	} else {
		ix = 1.0{{dtype_suffix}} / x;
		s1 = {{P_DESCENDING}};
		s2 = {{Q_DESCENDING}};
	}
	return s1 / s2;
}