.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> type that invokes the
              <code class="computeroutput">fusion::at()</code> accessor function on its arguments.</p>
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<a name="id-1.3.33.5.15.4.4.3"></a><h3>
<a name="id-1_3_33_5_13_2_1_1_1_5-bb"></a><code class="computeroutput">at</code> public member functions</h3>
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<pre class="literallayout"><span class="keyword">templ