n> <span class="identifier">sp1</span><span class="special">;</span>
<span class="identifier">storage_ptr</span> <span class="identifier">sp2</span><span class="special">;</span>

<span class="identifier">assert</span><span class="special">(</span> <span class="identifier">sp1</span><span class="special">.</span><span class="identifier">get</span><span class="special">()</span> <span class="special">!=</span> <span class="keyword">nullptr</span> <span class="special">);</span>                         <span 