Method ulp

CodenameOne/src/com/codename1/util/MathUtil.java:1292–1316

(double d)

    ///
    /// size of an ulp for the argument
    public static double ulp(double d) {
        if (Double.isNaN(d)) {
            // If the argument is NaN, then the result is NaN.
            return Double.NaN;
        }

        if (Double.isInfinite(d)) {
            // If the argument is positive or negative infinity, then the
            // result is positive infinity.
            return Double.POSITIVE_INFINITY;
        }

        if (d == 0.0) {
            // If the argument is positive or negative zero, then the result is Double.MIN_VALUE.
            return Double.MIN_VALUE;
        }

        d = Math.abs(d);
        if (d == Double.MAX_VALUE) {
            // If the argument is Double.MAX_VALUE, then the result is equal to 2^971.
            return MAX_ULP;
        }

        return nextAfter(d, Double.MAX_VALUE) - d;
    }

    private static boolean isSameSign(double x, double y) {
        return copySign(x, y) == x;