n class="keyword">struct</span> <span class="identifier">invert_actions</span><span class="special">::</span><span class="identifier">when</span><span class="special">&lt;</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">rule</span><span class="special">::</span><span class="identifier">divides</span><span class="special">&gt;</span>
    <span class="special">:</span> <a href="http://www.boost.org/doc/libs/release/doc/html/boost/proto/call.html" target="_t