n></div><div class="line"><span class="comment">// set have the same hash.</span></div><div class="line"><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><span class="keyword">struct </span>bucket { };</div><div class="line"></div><div class="line"><span class="keyword">template</span> &lt;<span class="keyword">typename</span> ...T&gt;</div><div class="line"><span class="keyword">struct </span>set</div><div class="line">    : bucket&lt;typename dec