<div dir="ltr">Ha! Got it. That helped. Thank you.<br><br>For the benefit of other fellow physicists with a reading problem, this will work:<br><br>template&lt;class MostDerived, class Context&gt;<br>

struct State : sc::simple_state&lt; MostDerived, Context &gt;<br>

{<br>&nbsp;&nbsp;&nbsp; // Some application-specific things common to all states<br>

};<br>

<br>struct StateA : State&lt; StateA, StateMachine &gt;<br>
{<br>
&nbsp;&nbsp;&nbsp; typedef sc::transition&lt; Event, StateB &gt; reactions;<br>
};<br><br>[...]<br><br>Stefan.<br><br><div class="gmail_quote">2008/9/1 Andreas Huber <span dir="ltr">&lt;<a href="mailto:ahd6974-spamboostorgtrap@yahoo.com">ahd6974-spamboostorgtrap@yahoo.com</a>&gt;</span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
[snipsnip]<br><div class="Ih2E3d">
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
May I be violating some prerequisites here?Thank you for any help you can provide, &nbsp;Stefan.<br>
</blockquote>
<br></div>
Yes, the first template argument passed to simple_state must be the *most-derived* simple_state&lt;&gt; subclass. Please see:<br>
<br>
&lt;<a href="http://www.boost.org/doc/libs/1_36_0/libs/statechart/doc/reference.html#ClassTemplatesimple_state" target="_blank">http://www.boost.org/doc/libs/1_36_0/libs/statechart/doc/reference.html#ClassTemplatesimple_state</a>&gt;, Class template simple_state parameters<br>

<br>
HTH,<br>
<br>
-- <br>
Andreas Huber<br>
<br>
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</blockquote></div><br></div>