<map id="ystdex::is_covariant&lt; _tFrom, _tTo &gt;" name="ystdex::is_covariant&lt; _tFrom, _tTo &gt;">
<area shape="rect" id="node1" title="判断指定类型之间是否协变。" alt="" coords="181,137,320,178"/>
<area shape="rect" id="node3" href="$d6/d8e/a01979.xhtml" title=" " alt="" coords="368,129,551,185"/>
<area shape="rect" id="node2" title=" " alt="" coords="5,137,133,178"/>
<area shape="rect" id="node4" href="$d3/d61/a02179.xhtml" title=" " alt="" coords="601,5,829,91"/>
<area shape="rect" id="node5" href="$d9/d96/a02091.xhtml" title=" " alt="" coords="624,115,805,200"/>
<area shape="rect" id="node6" href="$d3/d4e/a01991.xhtml" title=" " alt="" coords="599,225,831,295"/>
</map>
