ltype(hana::hash(std::declval&lt;T&gt;()))::type&gt;...</div><div class="line">{ };</div><div class="line"></div><div class="line"><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Set, <span class="keyword">typename</span> T&gt;</div><div class="line"><span class="keyword">struct </span><a class="code" href="group__group-Searchable.html#ga38e7748956cbc9f3d9bb035ac8577906">contains</a></div><div class="line">    : std::is_base_of&lt;</div><div class="line">        bucket&lt;typ