rence.com/w/cpp/io/basic_ostream.html">std::ostream</a>&amp; os)<span class="keyword"> const </span>{</div><div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;  os &lt;&lt; <span class="stringliteral">&quot;digraph Taskflow {\n&quot;</span>;</div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;  _dump(os, <span class="keyword">this</span>);</div><div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;  os &lt;&lt; <span class="str