d_ptr">shared_ptr</a> <span class="special">&amp;</span> r<span class="special">)</span><span class="special">;</span></pre>
<p>Copy constructs a <code class="computeroutput"><a class="link" href="shared_ptr.html" title="Class template shared_ptr">shared_ptr</a></code>. If r is empty, constructs an empty <code class="computeroutput"><a class="link" href="shared_ptr.html" title="Class template shared_ptr">shared_ptr</a></code>. Otherwise, constructs a <code class="computeroutput"><a class="link" href="shared