ass="identifier">can_call_funop</span><span class="special">,</span> <span class="keyword">operator</span><span class="special">());</span>
    <span class="identifier">BOOST_DECLARE_IS_CALLABLE</span><span class="special">(</span><span class="identifier">can_call_func</span><span class="special">,</span> <span class="identifier">func</span><span class="special">);</span>
<span class="special">}}</span>
</pre>
<p>
      </p>
<p>
        The traits allow to test if the supplied class has respectively <code c