class="comment">// always points to a valid resource</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="identifier">sp2</span><span class="special">.</span><span class="identifier">get</span><span class="special">()</span> <span class="special">);</span>                       <span class="comment">// both poi