an 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>
      Add back in the standard comparison operators, default constructor, and template
      copy constructor (which are all the same), and you have a <code class="computer