pan></tt> is <tt class="docutils literal"><span class="pre">use_default</span></tt> then the <tt class="docutils literal"><span class="pre">reference</span></tt> member of
<tt class="docutils literal"><span class="pre">transform_iterator</span></tt> is
<tt class="docutils literal"><span class="pre">result_of&lt;const UnaryFunction(iterator_traits&lt;Iterator&gt;::reference)&gt;::type</span></tt>.
Otherwise, <tt class="docutils literal"><span class="pre">reference</span></tt> is <tt class="docutils literal">