code class="computeroutput"><span class="identifier">zip_iterator</span></code></a>:
          an iterator over tuples of the elements at corresponding positions of heterogeneous
          underlying iterators.
        </li>
</ul></div>
<h3>
<a name="iterator.intro.h3"></a>
      <span class="phrase"><a name="iterator.intro.iterator_utilities"></a></span><a class="link" href="index.html#iterator.intro.iterator_utilities">Iterator
      Utilities</a>
    </h3>
<h4>
<a name="iterator.intro.h4"></a>
      <spa