rnal_r" title="Class template return_internal_reference">return_internal_reference</a>)
                is useful when it is expensive to copy sequence elements of a wrapped
                class type. Customization of Target is useful when Accessor1 is a
                function object, or when a base class of the intended target type
                would otherwise be deduced.
              </p></dd>
</dl>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="hig