I have:
public struct IntPoint
{
    public long X;
    public long Y;
    ....
}
Which is part of another library (that I should not change).

I want to make a 'generic' class that would be able to handle arguments of both the above mentioned struct and System.Drawing.PointF. Like:

class SomeClass<T> where T : "something something IntPoint Or The Other One, PointF"  << I know I can't do this in this manner
{
    private T p;

    void SomethingSomething(T q) { p = q; }
}