al">&lt;</span><span class="identifier">Expr</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> 
  <span class="identifier">deep_copy</span><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&amp;</span> expr<span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.33.5.8.6.4"></a><h2>Description</h2>
<p>
            A function