"identifier">A2</span><span class="special">,</span> <span class="identifier">S2</span> <span class="special">&gt;</span> <span class="special">&amp;</span> b<span class="special">)</span><span class="special">;</span>
    <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A1<span class="special">,</span> <span class="keyword">typename</span> S1<span class="special">,</span> <span class="keyword">typename</span> A2<span class="special">,</span> <span 