d.
</p>
</div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="range_checking"></a>Range Checking</h3></div></div></div>
<p>
By default, the array access methods <code class="literal">operator()</code> and
<code class="literal">operator[]</code> perform range
checking.  If a supplied index is out of the range defined for an
array, an assertion will abort the program.  To disable range
checking (for performance reasons in production releases), define
the <code class="l