ial">(</span><span class="identifier">A0</span><span class="special">,</span> <span class="identifier">A1</span><span class="special">)&gt;</span>
            <span class="special">:</span> <span class="identifier">remove_reference</span><span class="special">&lt;</span><span class="identifier">A0</span><span class="special">&gt;</span>
        <span class="special">{};</span>

        <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="i