n class="special">{</span>
            <span class="keyword">return</span> <span class="identifier">a0</span> <span class="special">+</span> <span class="identifier">a1</span> <span class="special">+</span> <span class="identifier">a2</span><span class="special">;</span>
        <span class="special">}</span>
    <span class="special">};</span>
<span class="special">}</span>

<span class="identifier">BOOST_PHOENIX_ADAPT_CALLABLE</span><span class="special">(</span><span class="identifier">plus</span><span c