<span class="special">=</span> <span class="identifier">Iterator</span><span class="special">());</span>
    <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">OtherIterator</span><span class="special">&gt;</span>
    <span class="identifier">filter_iterator</span><span class="special">(</span>
        <span class="identifier">filter_iterator</span><span class="special">&lt;</span><span class="identifier">Predicate</span><span cl