<map id="Graphical Class Hierarchy" name="Graphical Class Hierarchy">
<area shape="rect" id="node1" href="$a04785.html" title="std::_Enable_copy_move\l\&lt; is_copy_constructible\l\&lt; _Tp \&gt;::value, __and_\&lt;\l is_copy_constructible\&lt; \l_Tp \&gt;, is_copy_assignable\l\&lt; _Tp \&gt; \&gt;::value, is_move_constructible\l\&lt; _Tp \&gt;::value, __and_\&lt; is_move_constructible\l\&lt; _Tp \&gt;, is_move_assignable\&lt; _Tp \&gt; \&gt;::value,\l optional\&lt; _Tp \&gt; \&gt;" alt="" coords="5,5,284,137"/>
<area shape="rect" id="node2" href="$a08753.html" title="Class template for optional values. " alt="" coords="332,104,499,156"/>
<area shape="rect" id="node3" href="$a08789.html" title="std::experimental::\lfundamentals_v1::_Optional\l_base\&lt; _Tp \&gt;" alt="" coords="57,161,232,213"/>
</map>