Thank you Steven,<br>
<br><br><div class="gmail_quote">On Sat, Apr 4, 2009 at 4:41 PM, Steven Watanabe <span dir="ltr">&lt;<a href="mailto:watanabesj@gmail.com">watanabesj@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">

AMDG<div class="im"><br></div>
The cost is apply_visitor is approximately that of a switch statement.</blockquote><div><br>Suppose I have 2 variant&lt;type1,type2&gt;. Is there something to help implementing a dispatcher ?<br><br>Regards,<br><br>Oivier<br>

</div></div><br>