ml#a53817979990da799e659b2576799a79a">boost::hana::optional&lt; T &gt;</a>
, <a class="el" href="structboost_1_1hana_1_1pair.html#a53817979990da799e659b2576799a79a">boost::hana::pair&lt; First, Second &gt;</a>
, <a class="el" href="structboost_1_1hana_1_1string.html#a53817979990da799e659b2576799a79a">boost::hana::string&lt; implementation_defined &gt;</a>
, <a class="el" href="structboost_1_1hana_1_1tuple.html#a53817979990da799e659b2576799a79a">boost::hana::tuple&lt; Xn &gt;</a>
</li>
<li>operator==
: <a cl