public void Explicit()
{
int x = 1234, y = 5678;
var point = new RoixPointInt(x, y);
var size = (RoixSizeInt)point;
size.Width.Is(x);
size.Height.Is(y);
}
public void Ctor(int x, int y)
{
var size = new RoixPointInt(x, y);
size.X.Is(x);
size.Y.Is(y);
var(x1, y1) = size;
x1.Is(x);
y1.Is(y);
}