class="preprocessor">#include &lt;<a class="code" href="plus_8hpp.html">boost/hana/plus.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="type_8hpp.html">boost/hana/type.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="mpl_2list_8hpp.html">boost/mpl/list.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;type_traits&gt;</span></div><div class="li