Data.Colour.RGB:hslsv from colour-2.3.3, C

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\[\frac{x - y}{2 - \left(x + y\right)} \]
(FPCore (x y) :precision binary64 (/ (- x y) (- 2.0 (+ x y))))
double code(double x, double y) {
	return (x - y) / (2.0 - (x + y));
}

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (x - y) / (2.0d0 - (x + y))
end function

public static double code(double x, double y) {
	return (x - y) / (2.0 - (x + y));
}

def code(x, y):
	return (x - y) / (2.0 - (x + y))

function code(x, y)
	return Float64(Float64(x - y) / Float64(2.0 - Float64(x + y)))
end

function tmp = code(x, y)
	tmp = (x - y) / (2.0 - (x + y));
end

code[x_, y_] := N[(N[(x - y), $MachinePrecision] / N[(2.0 - N[(x + y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

\frac{x - y}{2 - \left(x + y\right)}