t;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Y<span class="special">&gt;</span> 
    <span class="keyword">explicit</span> <a class="link" href="shared_ptr.html#idp56335744-bb"><span class="identifier">shared_ptr</span></a><span class="special">(</span><a class="link" href="weak_ptr.html" title="Class temp