.NET (Core and Framework)

public class BezierFragment
{
    Point2D[] controlPoints; // length: 2, 3 or 4
}
public struct Point2D { public double X, Y; }

public struct BezierFragment
{
    byte order; // 2, 3, or 4
    Point2D p0, p1, p2, p3;
}
public struct Point2D { public double X, Y; }