</dd>
<dt><span class="term"><code class="function">size_type size()</code></span></dt>
<dd><p>This function returns the size of the specified range. It is
equivalent to <code class="literal">finish()-start()</code>.</p></dd>
</dl></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="extent_gen"></a><code class="computeroutput">extent_gen</code>
</h3></div></div></div>
<p>The <code class="computeroutput">extent_gen</code> class defines an
interface for aggregating ar