"identifier">rule</span><span class="special">&lt;</span><span class="identifier">OutputIterator</span><span class="special">,</span> <span class="identifier">A1</span><span class="special">,</span> <span class="identifier">A2</span><span class="special">,</span> <span class="identifier">A3</span><span class="special">&gt;</span>
    <span class="identifier">r</span><span class="special">(</span><span class="identifier">r2</span><span class="special">);</span></pre>
<p>
                    </p>
            