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<h2><span class="refentrytitle">Struct at</span></h2>
<p>boost::proto::functional::at &#8212; A <a class="link" href="../../../PolymorphicFunctionObject.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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