n><span class="identifier">EnclosingType</span><span class="special">,</span><span class="identifier">UDMarkerType</span><span class="special">&gt;</span> <span class="identifier">IMTypeWithMarkerType</span><span class="special">;</span>
</pre>
<p>
      then
    </p>
<pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">tti</span><span class="special">::</span><span class="identifier">valid_member_type</span><span class="special">&lt;</span