to <code class="computeroutput"><span class="identifier">X</span></code> meeting
          the requirements of Default Constructible and Single Pass Iterator, the
          following expressions are valid and respect the stated semantics.
        </p>
<div class="table">
<a name="iterator.concepts.traversal.forward.forward_traversal_iterator_requi"></a><p class="title"><b>Table&#160;1.7.&#160;Forward Traversal Iterator Requirements (in addition to Default
          Constructible and Single Pass Iterator)</b