for_each_task</a>(V&amp;&amp; visitor) <span class="keyword">const</span>;</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;  <span class="keyword">private</span>:</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160; </div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/cpp-ta