ndard Proposal for New-Style
      Iterators</a>.
    </p>
<h3>
<a name="iterator.intro.h1"></a>
      <span class="phrase"><a name="iterator.intro.iterator_facade_and_adaptor"></a></span><a class="link" href="index.html#iterator.intro.iterator_facade_and_adaptor">Iterator
      Facade and Adaptor</a>
    </h3>
<p>
      Writing standard-conforming iterators is tricky, but the need comes up often.
      In order to ease the implementation of new iterators, the Boost.Iterator library
      provides the <a hr