s
      are empty classes, then the <span class="emphasis"><em>empty base-class optimisation</em></span>
      is applied to compress the size of the pair.
    </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="compressed_pair.synopsis"></a><a class="link" href="compressed_pair.html#compressed_pair.synopsis" title="Synopsis">Synopsis</a>
</h2></div></div></div>
<pre class="programlisting"><span class="keyword">template</span> <span class="speci