span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">arg_names</span><span class="special">::</span><span class="identifier">arg2</span><span class="special">;</span>

    <span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">123</span><span class="special">;</span>
    <span class="keyword">int</span>