"special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> r<span class="special">)</span><span class="special">;</span></pre>
<p>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_ptr.html" title="Class template shared_ptr">shared_ptr</a></code> that shares ownership with r. Never throw