con">C</span></span><a class="el" href="structboost_1_1hana_1_1optional__tag.html" target="_self">boost::hana::optional_tag</a></td><td class="desc">Tag representing a <code><a class="el" href="structboost_1_1hana_1_1optional.html" title="Optional value whose optional-ness is known at compile-time.">hana::optional</a></code> </td></tr>
<tr id="row_46_"><td class="entry"><span style="width:16px;display:inline-block;">&#160;</span><span class="icona"><span class="icon">C</span></span><a class="el" href="struc