ifier">nsecond</span><span class="special">)</span>
<span class="special">:</span><span class="identifier">first</span><span class="special">(</span><span class="identifier">nfirst</span><span class="special">),</span> <span class="identifier">second</span><span class="special">(</span><span class="identifier">nsecond</span><span class="special">)</span> <span class="special">{</span> <span class="special">}</span>
<span class="special">};</span>
</pre>
<p>
      Now, this "pair" cannot hold references as i