rable</a>[_ &gt;: <span name="java.util.Comparator.thenComparing.U" class="extype">U</span> &lt;: <span name="scala.AnyRef" class="extype">AnyRef</span>]</span>]</span><span class="params">(<span name="arg0">arg0: <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Function.html#java.util.function.Function" name="java.util.function.Function" id="java.util.function.Function" class="extype">Function</a>[_ &gt;: <a href="HeapHistogramEntry.html" name="com.workday.warp.heaphistogram.HeapHistog