n><span class="special">,</span><span class="identifier">IMTypeWithMarkerType</span><span class="special">::</span><span class="identifier">boost_tti_marker_type</span><span class="special">&gt;::</span><span class="identifier">value</span>
</pre>
<p>
      or
    </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_metafunction</span><span class="special">&