lass="identifier">n</span><span class="special">);</span>
    <span class="keyword">void</span> <span class="identifier">increment</span><span class="special">();</span>
    <span class="keyword">void</span> <span class="identifier">decrement</span><span class="special">();</span>

    <span class="keyword">template</span> <span class="special">&lt;</span>
        <span class="keyword">class</span> <span class="identifier">OtherDerived</span><span class="special">,</span> <span class="keyword">class</span> 