 class="identifier">data_param</span> data<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>
                  <code class="computeroutput"><code class="computeroutput"><a class="link" href="../lazy.html" title="Struct template lazy">proto::lazy</a></code>&lt;T&gt;::impl&lt;Expr,State,Data&gt;::operator()</code> behaves as follows:
                  </p>
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