protected abstract void Tick(ref Rows rows, Span <T> comp1);
public static extern IntPtr field(ref Rows rows, UIntPtr size, uint column, uint row);
unsafe void ISystem.Tick(ref Rows rows)
{
var set1 = (T *)_ecs.column(ref rows, Heap.SizeOf <T>(), 1);
Tick(ref rows, new Span <T>(set1, (int)rows.count));
}
public static extern IntPtr column(ref Rows rows, UIntPtr size, uint column);