@Override
    public int hashCode() {
        int result;
        long temp;
        temp = Double.doubleToLongBits(l);
        result = (int) (temp ^ temp >>> 32);
        temp = Double.doubleToLongBits(c);
        result = 31 * result + (int) (temp ^ temp >>> 32);
        temp = Double.doubleToLongBits(h);
        return 31 * result + (int) (temp ^ temp >>> 32);
    }
Constructs a new instance.

@param l L* lightness.
@param c chroma.
@param h hue.
src/main/java/org/apache/commons/imaging/color/ColorCieLch.java