an class="lineno">  128</span>&#160;  <span class="keywordflow">return</span> _graph.size();</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;}</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;<span class="comment">// Function: empty</span></div><div class="line"><a name="l00132"></a><span class="lineno"><a class="line" href="classtf_1_1Taskflow.html#a224301