ass="literallayout"><span class="keyword">typename</span> DifferenceType <span class="special">=</span> <span class="special">::</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span></pre>
<p>The iterator's difference type.</p>
</li>
<li class="listitem"><pre class="literallayout"><span class="keyword">typename</span> ValueType <span class="special">=</span> <span class="keyword">typename</span> <a class="link" href="deduced.html" title="Struct tem