On Dec 10, 2007 4:37 PM, Neal Becker &lt;<a href="mailto:ndbecker2@gmail.com">ndbecker2@gmail.com</a>&gt; wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I understand that it doesn&#39;t store the zeros - that&#39;s why I used it. &nbsp;I<br>thought it was supposed to act _as if_ it had stored the zeros.<br><div><div></div><div class="Wj3C7c"></div></div></blockquote><div><br>Appearently, not. Iterators seem to be _storage oriented_. Otherwise the concept of an indexed iterator wouldn&#39;t make much sense -- Also, you&#39;d have a problem with dereferencing nonexisting data ;)
<br><br>Indexed iterators are an advantage because they allow us to exploit any sparseness.<br><br>If you don&#39;t want that it should be possible to build a &quot;const dense iterator proxy&quot; that behaves the way you want it to.
<br><br><br>Cheers!<br>SG<br></div></div>