tring">"is_in_rectangle"</span><span class="special">)</span>
        <span class="special">{</span>
            <span class="keyword">return</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">is_in_rectangle</span><span class="special">,</span> <span class="identifier">expr</span><span class="special">::</span><span cla