tifier">p</span><span class="special">[</span><span class="identifier">f</span><span class="special">]</span>
</pre>
<p>
        where <code class="computeroutput"><span class="identifier">f</span></code> is a function with
        the signatures:
      </p>
<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">Context</span><span class="special">&amp;);</span>
</pre>
</div>
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