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<h2><span class="refentrytitle">Struct first</span></h2>
<p>boost::proto::functional::first &#8212; 
            A <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> type that returns
            the first element of a <code class="computeroutput">std::pair&lt;&gt;</code>.
          </p>
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