compile-time assertions (<a href="http://www.jaggersoft.com/pubs/CVu11_3.html" rel="nofollow">http://www.jaggersoft.com/pubs/CVu11_3.html</a>), xmacro trick (<a href="http://www.drdobbs.com/184401387" rel="nofollow">http://www.drdobbs.com/184401387</a>) are a few things that seem to be missing...