erator_adaptor_</span><span class="special">(</span><span class="identifier">p</span><span class="special">)</span> <span class="special">{}</span>

    <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">OtherValue</span><span class="special">&gt;</span>
    <span class="identifier">node_iter</span><span class="special">(</span>
        <span class="identifier">node_iter</span><span class="special">&lt;</span><span class="identi